Support linearized loading

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index ff14a984bd011602cb504af059e56da0d0034f28..726f88d7c4f0cf2ab6b0662717774db793c434a2 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -1,4691 +1,5091 @@
-// Copyright 2014 PDFium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
-
-#include <set>
-#include <utility>
-#include <vector>
-
-#include "../../../include/fpdfapi/fpdf_module.h"
-#include "../../../include/fpdfapi/fpdf_page.h"
-#include "../../../include/fpdfapi/fpdf_parser.h"
-#include "../../../include/fxcrt/fx_safe_types.h"
-#include "../fpdf_page/pageint.h"
-
-FX_BOOL IsSignatureDict(const CPDF_Dictionary* pDict) {
-  CPDF_Object* pType = pDict->GetElementValue(FX_BSTRC("Type"));
-  if (!pType) {
-    pType = pDict->GetElementValue(FX_BSTRC("FT"));
-    if (!pType) {
-      return FALSE;
-    }
-  }
-  if (pType->GetString() == FX_BSTRC("Sig")) {
-    return TRUE;
-  }
-  return FALSE;
-}
-static int _CompareFileSize(const void* p1, const void* p2) {
-  FX_FILESIZE ret = (*(FX_FILESIZE*)p1) - (*(FX_FILESIZE*)p2);
-  if (ret > 0) {
-    return 1;
-  }
-  if (ret < 0) {
-    return -1;
-  }
-  return 0;
-}
-
-CPDF_Parser::CPDF_Parser() {
-  m_pDocument = NULL;
-  m_pTrailer = NULL;
-  m_pEncryptDict = NULL;
-  m_pSecurityHandler = NULL;
-  m_pLinearized = NULL;
-  m_dwFirstPageNo = 0;
-  m_dwXrefStartObjNum = 0;
-  m_bOwnFileRead = TRUE;
-  m_FileVersion = 0;
-  m_bForceUseSecurityHandler = FALSE;
-}
-CPDF_Parser::~CPDF_Parser() {
-  CloseParser(FALSE);
-}
-FX_DWORD CPDF_Parser::GetLastObjNum() {
-  FX_DWORD dwSize = m_CrossRef.GetSize();
-  return dwSize ? dwSize - 1 : 0;
-}
-void CPDF_Parser::SetEncryptDictionary(CPDF_Dictionary* pDict) {
-  m_pEncryptDict = pDict;
-}
-void CPDF_Parser::CloseParser(FX_BOOL bReParse) {
-  m_bVersionUpdated = FALSE;
-  if (!bReParse) {
-    delete m_pDocument;
-    m_pDocument = NULL;
-  }
-  if (m_pTrailer) {
-    m_pTrailer->Release();
-    m_pTrailer = NULL;
-  }
-  ReleaseEncryptHandler();
-  SetEncryptDictionary(NULL);
-  if (m_bOwnFileRead && m_Syntax.m_pFileAccess) {
-    m_Syntax.m_pFileAccess->Release();
-    m_Syntax.m_pFileAccess = NULL;
-  }
-  FX_POSITION pos = m_ObjectStreamMap.GetStartPosition();
-  while (pos) {
-    void* objnum;
-    CPDF_StreamAcc* pStream;
-    m_ObjectStreamMap.GetNextAssoc(pos, objnum, (void*&)pStream);
-    delete pStream;
-  }
-  m_ObjectStreamMap.RemoveAll();
-  m_SortedOffset.RemoveAll();
-  m_CrossRef.RemoveAll();
-  m_V5Type.RemoveAll();
-  m_ObjVersion.RemoveAll();
-  int32_t iLen = m_Trailers.GetSize();
-  for (int32_t i = 0; i < iLen; ++i) {
-    if (CPDF_Dictionary* trailer = m_Trailers.GetAt(i))
-      trailer->Release();
-  }
-  m_Trailers.RemoveAll();
-  if (m_pLinearized) {
-    m_pLinearized->Release();
-    m_pLinearized = NULL;
-  }
-}
-static int32_t GetHeaderOffset(IFX_FileRead* pFile) {
-  FX_DWORD tag = FXDWORD_FROM_LSBFIRST(0x46445025);
-  uint8_t buf[4];
-  int32_t offset = 0;
-  while (1) {
-    if (!pFile->ReadBlock(buf, offset, 4)) {
-      return -1;
-    }
-    if (*(FX_DWORD*)buf == tag) {
-      return offset;
-    }
-    offset++;
-    if (offset > 1024) {
-      return -1;
-    }
-  }
-  return -1;
-}
-CPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler();
-CPDF_SecurityHandler* FPDF_CreatePubKeyHandler(void*);
-FX_DWORD CPDF_Parser::StartParse(IFX_FileRead* pFileAccess,
-                                 FX_BOOL bReParse,
-                                 FX_BOOL bOwnFileRead) {
-  CloseParser(bReParse);
-  m_bXRefStream = FALSE;
-  m_LastXRefOffset = 0;
-  m_bOwnFileRead = bOwnFileRead;
-  int32_t offset = GetHeaderOffset(pFileAccess);
-  if (offset == -1) {
-    if (bOwnFileRead && pFileAccess) {
-      pFileAccess->Release();
-    }
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  m_Syntax.InitParser(pFileAccess, offset);
-  uint8_t ch;
-  if (!m_Syntax.GetCharAt(5, ch)) {
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  if (ch >= '0' && ch <= '9') {
-    m_FileVersion = (ch - '0') * 10;
-  }
-  if (!m_Syntax.GetCharAt(7, ch)) {
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  if (ch >= '0' && ch <= '9') {
-    m_FileVersion += ch - '0';
-  }
-  if (m_Syntax.m_FileLen < m_Syntax.m_HeaderOffset + 9) {
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  m_Syntax.RestorePos(m_Syntax.m_FileLen - m_Syntax.m_HeaderOffset - 9);
-  if (!bReParse) {
-    m_pDocument = new CPDF_Document(this);
-  }
-  FX_BOOL bXRefRebuilt = FALSE;
-  if (m_Syntax.SearchWord(FX_BSTRC("startxref"), TRUE, FALSE, 4096)) {
-    FX_FILESIZE startxref_offset = m_Syntax.SavePos();
-    void* pResult = FXSYS_bsearch(&startxref_offset, m_SortedOffset.GetData(),
-                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-                                  _CompareFileSize);
-    if (pResult == NULL) {
-      m_SortedOffset.Add(startxref_offset);
-    }
-    m_Syntax.GetKeyword();
-    FX_BOOL bNumber;
-    CFX_ByteString xrefpos_str = m_Syntax.GetNextWord(bNumber);
-    if (!bNumber) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    m_LastXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str);
-    if (!LoadAllCrossRefV4(m_LastXRefOffset) &&
-        !LoadAllCrossRefV5(m_LastXRefOffset)) {
-      if (!RebuildCrossRef()) {
-        return PDFPARSE_ERROR_FORMAT;
-      }
-      bXRefRebuilt = TRUE;
-      m_LastXRefOffset = 0;
-    }
-  } else {
-    if (!RebuildCrossRef()) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    bXRefRebuilt = TRUE;
-  }
-  FX_DWORD dwRet = SetEncryptHandler();
-  if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-    return dwRet;
-  }
-  m_pDocument->LoadDoc();
-  if (m_pDocument->GetRoot() == NULL || m_pDocument->GetPageCount() == 0) {
-    if (bXRefRebuilt) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    ReleaseEncryptHandler();
-    if (!RebuildCrossRef()) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    dwRet = SetEncryptHandler();
-    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-      return dwRet;
-    }
-    m_pDocument->LoadDoc();
-    if (m_pDocument->GetRoot() == NULL) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-  }
-  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-              sizeof(FX_FILESIZE), _CompareFileSize);
-  FX_DWORD RootObjNum = GetRootObjNum();
-  if (RootObjNum == 0) {
-    ReleaseEncryptHandler();
-    RebuildCrossRef();
-    RootObjNum = GetRootObjNum();
-    if (RootObjNum == 0) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    dwRet = SetEncryptHandler();
-    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-      return dwRet;
-    }
-  }
-  if (m_pSecurityHandler && !m_pSecurityHandler->IsMetadataEncrypted()) {
-    CPDF_Reference* pMetadata =
-        (CPDF_Reference*)m_pDocument->GetRoot()->GetElement(
-            FX_BSTRC("Metadata"));
-    if (pMetadata && pMetadata->GetType() == PDFOBJ_REFERENCE) {
-      m_Syntax.m_MetadataObjnum = pMetadata->GetRefObjNum();
-    }
-  }
-  return PDFPARSE_ERROR_SUCCESS;
-}
-FX_DWORD CPDF_Parser::SetEncryptHandler() {
-  ReleaseEncryptHandler();
-  SetEncryptDictionary(NULL);
-  if (m_pTrailer == NULL) {
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  CPDF_Object* pEncryptObj = m_pTrailer->GetElement(FX_BSTRC("Encrypt"));
-  if (pEncryptObj) {
-    if (pEncryptObj->GetType() == PDFOBJ_DICTIONARY) {
-      SetEncryptDictionary((CPDF_Dictionary*)pEncryptObj);
-    } else if (pEncryptObj->GetType() == PDFOBJ_REFERENCE) {
-      pEncryptObj = m_pDocument->GetIndirectObject(
-          ((CPDF_Reference*)pEncryptObj)->GetRefObjNum());
-      if (pEncryptObj) {
-        SetEncryptDictionary(pEncryptObj->GetDict());
-      }
-    }
-  }
-  if (m_bForceUseSecurityHandler) {
-    FX_DWORD err = PDFPARSE_ERROR_HANDLER;
-    if (m_pSecurityHandler == NULL) {
-      return PDFPARSE_ERROR_HANDLER;
-    }
-    if (!m_pSecurityHandler->OnInit(this, m_pEncryptDict)) {
-      return err;
-    }
-    CPDF_CryptoHandler* pCryptoHandler =
-        m_pSecurityHandler->CreateCryptoHandler();
-    if (!pCryptoHandler->Init(m_pEncryptDict, m_pSecurityHandler)) {
-      delete pCryptoHandler;
-      pCryptoHandler = NULL;
-      return PDFPARSE_ERROR_HANDLER;
-    }
-    m_Syntax.SetEncrypt(pCryptoHandler);
-  } else if (m_pEncryptDict) {
-    CFX_ByteString filter = m_pEncryptDict->GetString(FX_BSTRC("Filter"));
-    CPDF_SecurityHandler* pSecurityHandler = NULL;
-    FX_DWORD err = PDFPARSE_ERROR_HANDLER;
-    if (filter == FX_BSTRC("Standard")) {
-      pSecurityHandler = FPDF_CreateStandardSecurityHandler();
-      err = PDFPARSE_ERROR_PASSWORD;
-    }
-    if (pSecurityHandler == NULL) {
-      return PDFPARSE_ERROR_HANDLER;
-    }
-    if (!pSecurityHandler->OnInit(this, m_pEncryptDict)) {
-      delete pSecurityHandler;
-      pSecurityHandler = NULL;
-      return err;
-    }
-    m_pSecurityHandler = pSecurityHandler;
-    CPDF_CryptoHandler* pCryptoHandler =
-        pSecurityHandler->CreateCryptoHandler();
-    if (!pCryptoHandler->Init(m_pEncryptDict, m_pSecurityHandler)) {
-      delete pCryptoHandler;
-      pCryptoHandler = NULL;
-      return PDFPARSE_ERROR_HANDLER;
-    }
-    m_Syntax.SetEncrypt(pCryptoHandler);
-  }
-  return PDFPARSE_ERROR_SUCCESS;
-}
-void CPDF_Parser::ReleaseEncryptHandler() {
-  delete m_Syntax.m_pCryptoHandler;
-  m_Syntax.m_pCryptoHandler = NULL;
-  if (!m_bForceUseSecurityHandler) {
-    delete m_pSecurityHandler;
-    m_pSecurityHandler = NULL;
-  }
-}
-FX_FILESIZE CPDF_Parser::GetObjectOffset(FX_DWORD objnum) {
-  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
-    return 0;
-  }
-  if (m_V5Type[objnum] == 1) {
-    return m_CrossRef[objnum];
-  }
-  if (m_V5Type[objnum] == 2) {
-    return m_CrossRef[(int32_t)m_CrossRef[objnum]];
-  }
-  return 0;
-}
-static int32_t GetDirectInteger(CPDF_Dictionary* pDict,
-                                const CFX_ByteStringC& key) {
-  CPDF_Object* pObj = pDict->GetElement(key);
-  if (pObj == NULL) {
-    return 0;
-  }
-  if (pObj->GetType() == PDFOBJ_NUMBER) {
-    return ((CPDF_Number*)pObj)->GetInteger();
-  }
-  return 0;
-}
-static FX_BOOL CheckDirectType(CPDF_Dictionary* pDict,
-                               const CFX_ByteStringC& key,
-                               int32_t iType) {
-  CPDF_Object* pObj = pDict->GetElement(key);
-  if (!pObj) {
-    return TRUE;
-  }
-  return pObj->GetType() == iType;
-}
-FX_BOOL CPDF_Parser::LoadAllCrossRefV4(FX_FILESIZE xrefpos) {
-  if (!LoadCrossRefV4(xrefpos, 0, TRUE, FALSE)) {
-    return FALSE;
-  }
-  m_pTrailer = LoadTrailerV4();
-  if (m_pTrailer == NULL) {
-    return FALSE;
-  }
-  int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
-  if (xrefsize <= 0 || xrefsize > (1 << 20)) {
-    return FALSE;
-  }
-  m_CrossRef.SetSize(xrefsize);
-  m_V5Type.SetSize(xrefsize);
-  CFX_FileSizeArray CrossRefList, XRefStreamList;
-  CrossRefList.Add(xrefpos);
-  XRefStreamList.Add(GetDirectInteger(m_pTrailer, FX_BSTRC("XRefStm")));
-  if (!CheckDirectType(m_pTrailer, FX_BSTRC("Prev"), PDFOBJ_NUMBER)) {
-    return FALSE;
-  }
-  FX_FILESIZE newxrefpos = GetDirectInteger(m_pTrailer, FX_BSTRC("Prev"));
-  if (newxrefpos == xrefpos) {
-    return FALSE;
-  }
-  xrefpos = newxrefpos;
-  while (xrefpos) {
-    CrossRefList.InsertAt(0, xrefpos);
-    LoadCrossRefV4(xrefpos, 0, TRUE, FALSE);
-    CPDF_Dictionary* pDict = LoadTrailerV4();
-    if (pDict == NULL) {
-      return FALSE;
-    }
-    if (!CheckDirectType(pDict, FX_BSTRC("Prev"), PDFOBJ_NUMBER)) {
-      pDict->Release();
-      return FALSE;
-    }
-    newxrefpos = GetDirectInteger(pDict, FX_BSTRC("Prev"));
-    if (newxrefpos == xrefpos) {
-      pDict->Release();
-      return FALSE;
-    }
-    xrefpos = newxrefpos;
-    XRefStreamList.InsertAt(0, pDict->GetInteger(FX_BSTRC("XRefStm")));
-    m_Trailers.Add(pDict);
-  }
-  for (int32_t i = 0; i < CrossRefList.GetSize(); i++)
-    if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE, i == 0)) {
-      return FALSE;
-    }
-  return TRUE;
-}
-FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV4(FX_FILESIZE xrefpos,
-                                                 FX_DWORD dwObjCount) {
-  if (!LoadLinearizedCrossRefV4(xrefpos, dwObjCount)) {
-    return FALSE;
-  }
-  m_pTrailer = LoadTrailerV4();
-  if (m_pTrailer == NULL) {
-    return FALSE;
-  }
-  int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
-  if (xrefsize == 0) {
-    return FALSE;
-  }
-  CFX_FileSizeArray CrossRefList, XRefStreamList;
-  CrossRefList.Add(xrefpos);
-  XRefStreamList.Add(GetDirectInteger(m_pTrailer, FX_BSTRC("XRefStm")));
-  xrefpos = GetDirectInteger(m_pTrailer, FX_BSTRC("Prev"));
-  while (xrefpos) {
-    CrossRefList.InsertAt(0, xrefpos);
-    LoadCrossRefV4(xrefpos, 0, TRUE, FALSE);
-    CPDF_Dictionary* pDict = LoadTrailerV4();
-    if (pDict == NULL) {
-      return FALSE;
-    }
-    xrefpos = GetDirectInteger(pDict, FX_BSTRC("Prev"));
-    XRefStreamList.InsertAt(0, pDict->GetInteger(FX_BSTRC("XRefStm")));
-    m_Trailers.Add(pDict);
-  }
-  for (int32_t i = 1; i < CrossRefList.GetSize(); i++)
-    if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE, i == 0)) {
-      return FALSE;
-    }
-  return TRUE;
-}
-FX_BOOL CPDF_Parser::LoadLinearizedCrossRefV4(FX_FILESIZE pos,
-                                              FX_DWORD dwObjCount) {
-  FX_FILESIZE dwStartPos = pos - m_Syntax.m_HeaderOffset;
-  m_Syntax.RestorePos(dwStartPos);
-  void* pResult =
-      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-                    sizeof(FX_FILESIZE), _CompareFileSize);
-  if (pResult == NULL) {
-    m_SortedOffset.Add(pos);
-  }
-  FX_DWORD start_objnum = 0;
-  FX_DWORD count = dwObjCount;
-  FX_FILESIZE SavedPos = m_Syntax.SavePos();
-  int32_t recordsize = 20;
-  char* pBuf = FX_Alloc(char, 1024 * recordsize + 1);
-  pBuf[1024 * recordsize] = '\0';
-  int32_t nBlocks = count / 1024 + 1;
-  for (int32_t block = 0; block < nBlocks; block++) {
-    int32_t block_size = block == nBlocks - 1 ? count % 1024 : 1024;
-    FX_DWORD dwReadSize = block_size * recordsize;
-    if ((FX_FILESIZE)(dwStartPos + dwReadSize) > m_Syntax.m_FileLen) {
-      FX_Free(pBuf);
-      return FALSE;
-    }
-    if (!m_Syntax.ReadBlock((uint8_t*)pBuf, dwReadSize)) {
-      FX_Free(pBuf);
-      return FALSE;
-    }
-    for (int32_t i = 0; i < block_size; i++) {
-      FX_DWORD objnum = start_objnum + block * 1024 + i;
-      char* pEntry = pBuf + i * recordsize;
-      if (pEntry[17] == 'f') {
-        m_CrossRef.SetAtGrow(objnum, 0);
-        m_V5Type.SetAtGrow(objnum, 0);
-      } else {
-        int32_t offset = FXSYS_atoi(pEntry);
-        if (offset == 0) {
-          for (int32_t c = 0; c < 10; c++) {
-            if (pEntry[c] < '0' || pEntry[c] > '9') {
-              FX_Free(pBuf);
-              return FALSE;
-            }
-          }
-        }
-        m_CrossRef.SetAtGrow(objnum, offset);
-        int32_t version = FXSYS_atoi(pEntry + 11);
-        if (version >= 1) {
-          m_bVersionUpdated = TRUE;
-        }
-        m_ObjVersion.SetAtGrow(objnum, version);
-        if (m_CrossRef[objnum] < m_Syntax.m_FileLen) {
-          void* pResult = FXSYS_bsearch(
-              &m_CrossRef[objnum], m_SortedOffset.GetData(),
-              m_SortedOffset.GetSize(), sizeof(FX_FILESIZE), _CompareFileSize);
-          if (pResult == NULL) {
-            m_SortedOffset.Add(m_CrossRef[objnum]);
-          }
-        }
-        m_V5Type.SetAtGrow(objnum, 1);
-      }
-    }
-  }
-  FX_Free(pBuf);
-  m_Syntax.RestorePos(SavedPos + count * recordsize);
-  return TRUE;
-}
-FX_BOOL CPDF_Parser::LoadCrossRefV4(FX_FILESIZE pos,
-                                    FX_FILESIZE streampos,
-                                    FX_BOOL bSkip,
-                                    FX_BOOL bFirst) {
-  m_Syntax.RestorePos(pos);
-  if (m_Syntax.GetKeyword() != FX_BSTRC("xref")) {
-    return FALSE;
-  }
-  void* pResult =
-      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-                    sizeof(FX_FILESIZE), _CompareFileSize);
-  if (pResult == NULL) {
-    m_SortedOffset.Add(pos);
-  }
-  if (streampos) {
-    void* pResult = FXSYS_bsearch(&streampos, m_SortedOffset.GetData(),
-                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-                                  _CompareFileSize);
-    if (pResult == NULL) {
-      m_SortedOffset.Add(streampos);
-    }
-  }
-  while (1) {
-    FX_FILESIZE SavedPos = m_Syntax.SavePos();
-    FX_BOOL bIsNumber;
-    CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
-    if (word.IsEmpty()) {
-      return FALSE;
-    }
-    if (!bIsNumber) {
-      m_Syntax.RestorePos(SavedPos);
-      break;
-    }
-    FX_DWORD start_objnum = FXSYS_atoi(word);
-    if (start_objnum >= (1 << 20)) {
-      return FALSE;
-    }
-    FX_DWORD count = m_Syntax.GetDirectNum();
-    m_Syntax.ToNextWord();
-    SavedPos = m_Syntax.SavePos();
-    FX_BOOL bFirstItem = FALSE;
-    int32_t recordsize = 20;
-    if (bFirst) {
-      bFirstItem = TRUE;
-    }
-    m_dwXrefStartObjNum = start_objnum;
-    if (!bSkip) {
-      char* pBuf = FX_Alloc(char, 1024 * recordsize + 1);
-      pBuf[1024 * recordsize] = '\0';
-      int32_t nBlocks = count / 1024 + 1;
-      FX_BOOL bFirstBlock = TRUE;
-      for (int32_t block = 0; block < nBlocks; block++) {
-        int32_t block_size = block == nBlocks - 1 ? count % 1024 : 1024;
-        m_Syntax.ReadBlock((uint8_t*)pBuf, block_size * recordsize);
-        for (int32_t i = 0; i < block_size; i++) {
-          FX_DWORD objnum = start_objnum + block * 1024 + i;
-          char* pEntry = pBuf + i * recordsize;
-          if (pEntry[17] == 'f') {
-            if (bFirstItem) {
-              objnum = 0;
-              bFirstItem = FALSE;
-            }
-            if (bFirstBlock) {
-              FX_FILESIZE offset = (FX_FILESIZE)FXSYS_atoi64(pEntry);
-              int32_t version = FXSYS_atoi(pEntry + 11);
-              if (offset == 0 && version == 65535 && start_objnum != 0) {
-                start_objnum--;
-                objnum = 0;
-              }
-            }
-            m_CrossRef.SetAtGrow(objnum, 0);
-            m_V5Type.SetAtGrow(objnum, 0);
-          } else {
-            FX_FILESIZE offset = (FX_FILESIZE)FXSYS_atoi64(pEntry);
-            if (offset == 0) {
-              for (int32_t c = 0; c < 10; c++) {
-                if (pEntry[c] < '0' || pEntry[c] > '9') {
-                  FX_Free(pBuf);
-                  return FALSE;
-                }
-              }
-            }
-            m_CrossRef.SetAtGrow(objnum, offset);
-            int32_t version = FXSYS_atoi(pEntry + 11);
-            if (version >= 1) {
-              m_bVersionUpdated = TRUE;
-            }
-            m_ObjVersion.SetAtGrow(objnum, version);
-            if (m_CrossRef[objnum] < m_Syntax.m_FileLen) {
-              void* pResult =
-                  FXSYS_bsearch(&m_CrossRef[objnum], m_SortedOffset.GetData(),
-                                m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-                                _CompareFileSize);
-              if (pResult == NULL) {
-                m_SortedOffset.Add(m_CrossRef[objnum]);
-              }
-            }
-            m_V5Type.SetAtGrow(objnum, 1);
-          }
-          if (bFirstBlock) {
-            bFirstBlock = FALSE;
-          }
-        }
-      }
-      FX_Free(pBuf);
-    }
-    m_Syntax.RestorePos(SavedPos + count * recordsize);
-  }
-  if (streampos)
-    if (!LoadCrossRefV5(streampos, streampos, FALSE)) {
-      return FALSE;
-    }
-  return TRUE;
-}
-FX_BOOL CPDF_Parser::LoadAllCrossRefV5(FX_FILESIZE xrefpos) {
-  if (!LoadCrossRefV5(xrefpos, xrefpos, TRUE)) {
-    return FALSE;
-  }
-  while (xrefpos)
-    if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
-      return FALSE;
-    }
-  m_ObjectStreamMap.InitHashTable(101, FALSE);
-  m_bXRefStream = TRUE;
-  return TRUE;
-}
-FX_BOOL CPDF_Parser::RebuildCrossRef() {
-  m_CrossRef.RemoveAll();
-  m_V5Type.RemoveAll();
-  m_SortedOffset.RemoveAll();
-  m_ObjVersion.RemoveAll();
-  if (m_pTrailer) {
-    m_pTrailer->Release();
-    m_pTrailer = NULL;
-  }
-  int32_t status = 0;
-  int32_t inside_index = 0;
-  FX_DWORD objnum = 0, gennum = 0;
-  int32_t depth = 0;
-  uint8_t* buffer = FX_Alloc(uint8_t, 4096);
-  FX_FILESIZE pos = m_Syntax.m_HeaderOffset;
-  FX_FILESIZE start_pos = 0, start_pos1 = 0;
-  FX_FILESIZE last_obj = -1, last_xref = -1, last_trailer = -1;
-  while (pos < m_Syntax.m_FileLen) {
-    FX_BOOL bOverFlow = FALSE;
-    FX_DWORD size = (FX_DWORD)(m_Syntax.m_FileLen - pos);
-    if (size > 4096) {
-      size = 4096;
-    }
-    if (!m_Syntax.m_pFileAccess->ReadBlock(buffer, pos, size)) {
-      break;
-    }
-    for (FX_DWORD i = 0; i < size; i++) {
-      uint8_t byte = buffer[i];
-      switch (status) {
-        case 0:
-          if (PDF_CharType[byte] == 'W') {
-            status = 1;
-          }
-          if (byte <= '9' && byte >= '0') {
-            --i;
-            status = 1;
-          }
-          if (byte == '%') {
-            inside_index = 0;
-            status = 9;
-          }
-          if (byte == '(') {
-            status = 10;
-            depth = 1;
-          }
-          if (byte == '<') {
-            inside_index = 1;
-            status = 11;
-          }
-          if (byte == '\\') {
-            status = 13;
-          }
-          if (byte == 't') {
-            status = 7;
-            inside_index = 1;
-          }
-          break;
-        case 1:
-          if (PDF_CharType[byte] == 'W') {
-            break;
-          } else if (byte <= '9' && byte >= '0') {
-            start_pos = pos + i;
-            status = 2;
-            objnum = byte - '0';
-          } else if (byte == 't') {
-            status = 7;
-            inside_index = 1;
-          } else if (byte == 'x') {
-            status = 8;
-            inside_index = 1;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 2:
-          if (byte <= '9' && byte >= '0') {
-            objnum = objnum * 10 + byte - '0';
-            break;
-          } else if (PDF_CharType[byte] == 'W') {
-            status = 3;
-          } else {
-            --i;
-            status = 14;
-            inside_index = 0;
-          }
-          break;
-        case 3:
-          if (byte <= '9' && byte >= '0') {
-            start_pos1 = pos + i;
-            status = 4;
-            gennum = byte - '0';
-          } else if (PDF_CharType[byte] == 'W') {
-            break;
-          } else if (byte == 't') {
-            status = 7;
-            inside_index = 1;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 4:
-          if (byte <= '9' && byte >= '0') {
-            gennum = gennum * 10 + byte - '0';
-            break;
-          } else if (PDF_CharType[byte] == 'W') {
-            status = 5;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 5:
-          if (byte == 'o') {
-            status = 6;
-            inside_index = 1;
-          } else if (PDF_CharType[byte] == 'W') {
-            break;
-          } else if (byte <= '9' && byte >= '0') {
-            objnum = gennum;
-            gennum = byte - '0';
-            start_pos = start_pos1;
-            start_pos1 = pos + i;
-            status = 4;
-          } else if (byte == 't') {
-            status = 7;
-            inside_index = 1;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 6:
-          switch (inside_index) {
-            case 1:
-              if (byte != 'b') {
-                --i;
-                status = 0;
-              } else {
-                inside_index++;
-              }
-              break;
-            case 2:
-              if (byte != 'j') {
-                --i;
-                status = 0;
-              } else {
-                inside_index++;
-              }
-              break;
-            case 3:
-              if (PDF_CharType[byte] == 'W' || PDF_CharType[byte] == 'D') {
-                if (objnum > 0x1000000) {
-                  status = 0;
-                  break;
-                }
-                FX_FILESIZE obj_pos = start_pos - m_Syntax.m_HeaderOffset;
-                last_obj = start_pos;
-                void* pResult =
-                    FXSYS_bsearch(&obj_pos, m_SortedOffset.GetData(),
-                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-                                  _CompareFileSize);
-                if (pResult == NULL) {
-                  m_SortedOffset.Add(obj_pos);
-                }
-                FX_FILESIZE obj_end = 0;
-                CPDF_Object* pObject = ParseIndirectObjectAtByStrict(
-                    m_pDocument, obj_pos, objnum, NULL, &obj_end);
-                if (pObject) {
-                  int iType = pObject->GetType();
-                  if (iType == PDFOBJ_STREAM) {
-                    CPDF_Stream* pStream = (CPDF_Stream*)pObject;
-                    CPDF_Dictionary* pDict = pStream->GetDict();
-                    if (pDict) {
-                      if (pDict->KeyExist(FX_BSTRC("Type"))) {
-                        CFX_ByteString bsValue =
-                            pDict->GetString(FX_BSTRC("Type"));
-                        if (bsValue == FX_BSTRC("XRef") &&
-                            pDict->KeyExist(FX_BSTRC("Size"))) {
-                          CPDF_Object* pRoot =
-                              pDict->GetElement(FX_BSTRC("Root"));
-                          if (pRoot && pRoot->GetDict() &&
-                              pRoot->GetDict()->GetElement(FX_BSTRC("Pages"))) {
-                            if (m_pTrailer) {
-                              m_pTrailer->Release();
-                            }
-                            m_pTrailer = (CPDF_Dictionary*)pDict->Clone();
-                          }
-                        }
-                      }
-                    }
-                  }
-                }
-                FX_FILESIZE offset = 0;
-                m_Syntax.RestorePos(obj_pos);
-                offset = m_Syntax.FindTag(FX_BSTRC("obj"), 0);
-                if (offset == -1) {
-                  offset = 0;
-                } else {
-                  offset += 3;
-                }
-                FX_FILESIZE nLen = obj_end - obj_pos - offset;
-                if ((FX_DWORD)nLen > size - i) {
-                  pos = obj_end + m_Syntax.m_HeaderOffset;
-                  bOverFlow = TRUE;
-                } else {
-                  i += (FX_DWORD)nLen;
-                }
-                if (m_CrossRef.GetSize() > (int32_t)objnum &&
-                    m_CrossRef[objnum]) {
-                  if (pObject) {
-                    FX_DWORD oldgen = m_ObjVersion.GetAt(objnum);
-                    m_CrossRef[objnum] = obj_pos;
-                    m_ObjVersion.SetAt(objnum, (int16_t)gennum);
-                    if (oldgen != gennum) {
-                      m_bVersionUpdated = TRUE;
-                    }
-                  }
-                } else {
-                  m_CrossRef.SetAtGrow(objnum, obj_pos);
-                  m_V5Type.SetAtGrow(objnum, 1);
-                  m_ObjVersion.SetAtGrow(objnum, (int16_t)gennum);
-                }
-                if (pObject) {
-                  pObject->Release();
-                }
-              }
-              --i;
-              status = 0;
-              break;
-          }
-          break;
-        case 7:
-          if (inside_index == 7) {
-            if (PDF_CharType[byte] == 'W' || PDF_CharType[byte] == 'D') {
-              last_trailer = pos + i - 7;
-              m_Syntax.RestorePos(pos + i - m_Syntax.m_HeaderOffset);
-              CPDF_Object* pObj = m_Syntax.GetObject(m_pDocument, 0, 0, 0);
-              if (pObj) {
-                if (pObj->GetType() != PDFOBJ_DICTIONARY &&
-                    pObj->GetType() != PDFOBJ_STREAM) {
-                  pObj->Release();
-                } else {
-                  CPDF_Dictionary* pTrailer = NULL;
-                  if (pObj->GetType() == PDFOBJ_STREAM) {
-                    pTrailer = ((CPDF_Stream*)pObj)->GetDict();
-                  } else {
-                    pTrailer = (CPDF_Dictionary*)pObj;
-                  }
-                  if (pTrailer) {
-                    if (m_pTrailer) {
-                      CPDF_Object* pRoot =
-                          pTrailer->GetElement(FX_BSTRC("Root"));
-                      if (pRoot == NULL ||
-                          (pRoot->GetType() == PDFOBJ_REFERENCE &&
-                           (FX_DWORD)m_CrossRef.GetSize() >
-                               ((CPDF_Reference*)pRoot)->GetRefObjNum() &&
-                           m_CrossRef.GetAt(((CPDF_Reference*)pRoot)
-                                                ->GetRefObjNum()) != 0)) {
-                        FX_POSITION pos = pTrailer->GetStartPos();
-                        while (pos) {
-                          CFX_ByteString key;
-                          CPDF_Object* pObj =
-                              pTrailer->GetNextElement(pos, key);
-                          m_pTrailer->SetAt(key, pObj->Clone(), m_pDocument);
-                        }
-                        pObj->Release();
-                      } else {
-                        pObj->Release();
-                      }
-                    } else {
-                      if (pObj->GetType() == PDFOBJ_STREAM) {
-                        m_pTrailer = (CPDF_Dictionary*)pTrailer->Clone();
-                        pObj->Release();
-                      } else {
-                        m_pTrailer = pTrailer;
-                      }
-                      FX_FILESIZE dwSavePos = m_Syntax.SavePos();
-                      CFX_ByteString strWord = m_Syntax.GetKeyword();
-                      if (!strWord.Compare(FX_BSTRC("startxref"))) {
-                        FX_BOOL bNumber = FALSE;
-                        CFX_ByteString bsOffset = m_Syntax.GetNextWord(bNumber);
-                        if (bNumber) {
-                          m_LastXRefOffset = FXSYS_atoi(bsOffset);
-                        }
-                      }
-                      m_Syntax.RestorePos(dwSavePos);
-                    }
-                  } else {
-                    pObj->Release();
-                  }
-                }
-              }
-            }
-            --i;
-            status = 0;
-          } else if (byte == "trailer"[inside_index]) {
-            inside_index++;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 8:
-          if (inside_index == 4) {
-            last_xref = pos + i - 4;
-            status = 1;
-          } else if (byte == "xref"[inside_index]) {
-            inside_index++;
-          } else {
-            --i;
-            status = 0;
-          }
-          break;
-        case 9:
-          if (byte == '\r' || byte == '\n') {
-            status = 0;
-          }
-          break;
-        case 10:
-          if (byte == ')') {
-            if (depth > 0) {
-              depth--;
-            }
-          } else if (byte == '(') {
-            depth++;
-          }
-          if (!depth) {
-            status = 0;
-          }
-          break;
-        case 11:
-          if (byte == '<' && inside_index == 1) {
-            status = 12;
-          } else if (byte == '>') {
-            status = 0;
-          }
-          inside_index = 0;
-          break;
-        case 12:
-          --i;
-          status = 0;
-          break;
-        case 13:
-          if (PDF_CharType[byte] == 'D' || PDF_CharType[byte] == 'W') {
-            --i;
-            status = 0;
-          }
-          break;
-        case 14:
-          if (PDF_CharType[byte] == 'W') {
-            status = 0;
-          } else if (byte == '%' || byte == '(' || byte == '<' ||
-                     byte == '\\') {
-            status = 0;
-            --i;
-          } else if (inside_index == 6) {
-            status = 0;
-            --i;
-          } else if (byte == "endobj"[inside_index]) {
-            inside_index++;
-          }
-          break;
-      }
-      if (bOverFlow) {
-        size = 0;
-        break;
-      }
-    }
-    pos += size;
-  }
-  if (last_xref != -1 && last_xref > last_obj) {
-    last_trailer = last_xref;
-  } else if (last_trailer == -1 || last_xref < last_obj) {
-    last_trailer = m_Syntax.m_FileLen;
-  }
-  FX_FILESIZE offset = last_trailer - m_Syntax.m_HeaderOffset;
-  void* pResult =
-      FXSYS_bsearch(&offset, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-                    sizeof(FX_FILESIZE), _CompareFileSize);
-  if (pResult == NULL) {
-    m_SortedOffset.Add(offset);
-  }
-  FX_Free(buffer);
-  return TRUE;
-}
-static FX_DWORD _GetVarInt(const uint8_t* p, int32_t n) {
-  FX_DWORD result = 0;
-  for (int32_t i = 0; i < n; i++) {
-    result = result * 256 + p[i];
-  }
-  return result;
-}
-FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE pos,
-                                    FX_FILESIZE& prev,
-                                    FX_BOOL bMainXRef) {
-  CPDF_Stream* pStream =
-      (CPDF_Stream*)ParseIndirectObjectAt(m_pDocument, pos, 0, NULL);
-  if (!pStream) {
-    return FALSE;
-  }
-  if (m_pDocument) {
-    CPDF_Dictionary* pDict = m_pDocument->GetRoot();
-    if (!pDict || pDict->GetObjNum() != pStream->m_ObjNum) {
-      m_pDocument->InsertIndirectObject(pStream->m_ObjNum, pStream);
-    } else {
-      if (pStream->GetType() == PDFOBJ_STREAM) {
-        pStream->Release();
-      }
-      return FALSE;
-    }
-  }
-  if (pStream->GetType() != PDFOBJ_STREAM) {
-    return FALSE;
-  }
-  prev = pStream->GetDict()->GetInteger(FX_BSTRC("Prev"));
-  int32_t size = pStream->GetDict()->GetInteger(FX_BSTRC("Size"));
-  if (size < 0) {
-    pStream->Release();
-    return FALSE;
-  }
-  if (bMainXRef) {
-    m_pTrailer = (CPDF_Dictionary*)pStream->GetDict()->Clone();
-    m_CrossRef.SetSize(size);
-    if (m_V5Type.SetSize(size)) {
-      FXSYS_memset(m_V5Type.GetData(), 0, size);
-    }
-  } else {
-    m_Trailers.Add((CPDF_Dictionary*)pStream->GetDict()->Clone());
-  }
-  std::vector<std::pair<int32_t, int32_t> > arrIndex;
-  CPDF_Array* pArray = pStream->GetDict()->GetArray(FX_BSTRC("Index"));
-  if (pArray) {
-    FX_DWORD nPairSize = pArray->GetCount() / 2;
-    for (FX_DWORD i = 0; i < nPairSize; i++) {
-      CPDF_Object* pStartNumObj = pArray->GetElement(i * 2);
-      CPDF_Object* pCountObj = pArray->GetElement(i * 2 + 1);
-      if (pStartNumObj && pStartNumObj->GetType() == PDFOBJ_NUMBER &&
-          pCountObj && pCountObj->GetType() == PDFOBJ_NUMBER) {
-        int nStartNum = pStartNumObj->GetInteger();
-        int nCount = pCountObj->GetInteger();
-        if (nStartNum >= 0 && nCount > 0) {
-          arrIndex.push_back(std::make_pair(nStartNum, nCount));
-        }
-      }
-    }
-  }
-  if (arrIndex.size() == 0) {
-    arrIndex.push_back(std::make_pair(0, size));
-  }
-  pArray = pStream->GetDict()->GetArray(FX_BSTRC("W"));
-  if (pArray == NULL) {
-    pStream->Release();
-    return FALSE;
-  }
-  CFX_DWordArray WidthArray;
-  FX_SAFE_DWORD dwAccWidth = 0;
-  for (FX_DWORD i = 0; i < pArray->GetCount(); i++) {
-    WidthArray.Add(pArray->GetInteger(i));
-    dwAccWidth += WidthArray[i];
-  }
-  if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3) {
-    pStream->Release();
-    return FALSE;
-  }
-  FX_DWORD totalWidth = dwAccWidth.ValueOrDie();
-  CPDF_StreamAcc acc;
-  acc.LoadAllData(pStream);
-  const uint8_t* pData = acc.GetData();
-  FX_DWORD dwTotalSize = acc.GetSize();
-  FX_DWORD segindex = 0;
-  for (FX_DWORD i = 0; i < arrIndex.size(); i++) {
-    int32_t startnum = arrIndex[i].first;
-    if (startnum < 0) {
-      continue;
-    }
-    m_dwXrefStartObjNum =
-        pdfium::base::checked_cast<FX_DWORD, int32_t>(startnum);
-    FX_DWORD count =
-        pdfium::base::checked_cast<FX_DWORD, int32_t>(arrIndex[i].second);
-    FX_SAFE_DWORD dwCaculatedSize = segindex;
-    dwCaculatedSize += count;
-    dwCaculatedSize *= totalWidth;
-    if (!dwCaculatedSize.IsValid() ||
-        dwCaculatedSize.ValueOrDie() > dwTotalSize) {
-      continue;
-    }
-    const uint8_t* segstart = pData + segindex * totalWidth;
-    FX_SAFE_DWORD dwMaxObjNum = startnum;
-    dwMaxObjNum += count;
-    FX_DWORD dwV5Size =
-        pdfium::base::checked_cast<FX_DWORD, int32_t>(m_V5Type.GetSize());
-    if (!dwMaxObjNum.IsValid() || dwMaxObjNum.ValueOrDie() > dwV5Size) {
-      continue;
-    }
-    for (FX_DWORD j = 0; j < count; j++) {
-      int32_t type = 1;
-      const uint8_t* entrystart = segstart + j * totalWidth;
-      if (WidthArray[0]) {
-        type = _GetVarInt(entrystart, WidthArray[0]);
-      }
-      if (m_V5Type[startnum + j] == 255) {
-        FX_FILESIZE offset =
-            _GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
-        m_CrossRef[startnum + j] = offset;
-        void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
-                                      m_SortedOffset.GetSize(),
-                                      sizeof(FX_FILESIZE), _CompareFileSize);
-        if (pResult == NULL) {
-          m_SortedOffset.Add(offset);
-        }
-        continue;
-      }
-      if (m_V5Type[startnum + j]) {
-        continue;
-      }
-      m_V5Type[startnum + j] = type;
-      if (type == 0) {
-        m_CrossRef[startnum + j] = 0;
-      } else {
-        FX_FILESIZE offset =
-            _GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
-        m_CrossRef[startnum + j] = offset;
-        if (type == 1) {
-          void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
-                                        m_SortedOffset.GetSize(),
-                                        sizeof(FX_FILESIZE), _CompareFileSize);
-          if (pResult == NULL) {
-            m_SortedOffset.Add(offset);
-          }
-        } else {
-          if (offset < 0 || offset >= m_V5Type.GetSize()) {
-            pStream->Release();
-            return FALSE;
-          }
-          m_V5Type[offset] = 255;
-        }
-      }
-    }
-    segindex += count;
-  }
-  pStream->Release();
-  return TRUE;
-}
-CPDF_Array* CPDF_Parser::GetIDArray() {
-  CPDF_Object* pID = m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("ID")) : NULL;
-  if (pID == NULL) {
-    return NULL;
-  }
-  if (pID->GetType() == PDFOBJ_REFERENCE) {
-    pID = ParseIndirectObject(NULL, ((CPDF_Reference*)pID)->GetRefObjNum());
-    m_pTrailer->SetAt(FX_BSTRC("ID"), pID);
-  }
-  if (pID == NULL || pID->GetType() != PDFOBJ_ARRAY) {
-    return NULL;
-  }
-  return (CPDF_Array*)pID;
-}
-FX_DWORD CPDF_Parser::GetRootObjNum() {
-  CPDF_Object* pRef =
-      m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("Root")) : NULL;
-  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
-    return 0;
-  }
-  return ((CPDF_Reference*)pRef)->GetRefObjNum();
-}
-FX_DWORD CPDF_Parser::GetInfoObjNum() {
-  CPDF_Object* pRef =
-      m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("Info")) : NULL;
-  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
-    return 0;
-  }
-  return ((CPDF_Reference*)pRef)->GetRefObjNum();
-}
-FX_BOOL CPDF_Parser::IsFormStream(FX_DWORD objnum, FX_BOOL& bForm) {
-  bForm = FALSE;
-  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
-    return TRUE;
-  }
-  if (m_V5Type[objnum] == 0) {
-    return TRUE;
-  }
-  if (m_V5Type[objnum] == 2) {
-    return TRUE;
-  }
-  FX_FILESIZE pos = m_CrossRef[objnum];
-  void* pResult =
-      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-                    sizeof(FX_FILESIZE), _CompareFileSize);
-  if (pResult == NULL) {
-    return TRUE;
-  }
-  if ((FX_FILESIZE*)pResult - (FX_FILESIZE*)m_SortedOffset.GetData() ==
-      m_SortedOffset.GetSize() - 1) {
-    return FALSE;
-  }
-  FX_FILESIZE size = ((FX_FILESIZE*)pResult)[1] - pos;
-  FX_FILESIZE SavedPos = m_Syntax.SavePos();
-  m_Syntax.RestorePos(pos);
-  bForm = m_Syntax.SearchMultiWord(FX_BSTRC("/Form\0stream"), TRUE, size) == 0;
-  m_Syntax.RestorePos(SavedPos);
-  return TRUE;
-}
-CPDF_Object* CPDF_Parser::ParseIndirectObject(CPDF_IndirectObjects* pObjList,
-                                              FX_DWORD objnum,
-                                              PARSE_CONTEXT* pContext) {
-  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
-    return NULL;
-  }
-  if (m_V5Type[objnum] == 1 || m_V5Type[objnum] == 255) {
-    FX_FILESIZE pos = m_CrossRef[objnum];
-    if (pos <= 0) {
-      return NULL;
-    }
-    return ParseIndirectObjectAt(pObjList, pos, objnum, pContext);
-  }
-  if (m_V5Type[objnum] == 2) {
-    CPDF_StreamAcc* pObjStream = GetObjectStream((FX_DWORD)m_CrossRef[objnum]);
-    if (pObjStream == NULL) {
-      return NULL;
-    }
-    int32_t n = pObjStream->GetDict()->GetInteger(FX_BSTRC("N"));
-    int32_t offset = pObjStream->GetDict()->GetInteger(FX_BSTRC("First"));
-    CPDF_SyntaxParser syntax;
-    CFX_SmartPointer<IFX_FileStream> file(FX_CreateMemoryStream(
-        (uint8_t*)pObjStream->GetData(), (size_t)pObjStream->GetSize(), FALSE));
-    syntax.InitParser(file.Get(), 0);
-    CPDF_Object* pRet = NULL;
-    while (n) {
-      FX_DWORD thisnum = syntax.GetDirectNum();
-      FX_DWORD thisoff = syntax.GetDirectNum();
-      if (thisnum == objnum) {
-        syntax.RestorePos(offset + thisoff);
-        pRet = syntax.GetObject(pObjList, 0, 0, pContext);
-        break;
-      }
-      n--;
-    }
-    return pRet;
-  }
-  return NULL;
-}
-CPDF_StreamAcc* CPDF_Parser::GetObjectStream(FX_DWORD objnum) {
-  CPDF_StreamAcc* pStreamAcc = NULL;
-  if (m_ObjectStreamMap.Lookup((void*)(uintptr_t)objnum, (void*&)pStreamAcc)) {
-    return pStreamAcc;
-  }
-  const CPDF_Stream* pStream =
-      m_pDocument ? (CPDF_Stream*)m_pDocument->GetIndirectObject(objnum) : NULL;
-  if (pStream == NULL || pStream->GetType() != PDFOBJ_STREAM) {
-    return NULL;
-  }
-  pStreamAcc = new CPDF_StreamAcc;
-  pStreamAcc->LoadAllData(pStream);
-  m_ObjectStreamMap.SetAt((void*)(uintptr_t)objnum, pStreamAcc);
-  return pStreamAcc;
-}
-FX_FILESIZE CPDF_Parser::GetObjectSize(FX_DWORD objnum) {
-  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
-    return 0;
-  }
-  if (m_V5Type[objnum] == 2) {
-    objnum = (FX_DWORD)m_CrossRef[objnum];
-  }
-  if (m_V5Type[objnum] == 1 || m_V5Type[objnum] == 255) {
-    FX_FILESIZE offset = m_CrossRef[objnum];
-    if (offset == 0) {
-      return 0;
-    }
-    void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
-                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-                                  _CompareFileSize);
-    if (pResult == NULL) {
-      return 0;
-    }
-    if ((FX_FILESIZE*)pResult - (FX_FILESIZE*)m_SortedOffset.GetData() ==
-        m_SortedOffset.GetSize() - 1) {
-      return 0;
-    }
-    return ((FX_FILESIZE*)pResult)[1] - offset;
-  }
-  return 0;
-}
-void CPDF_Parser::GetIndirectBinary(FX_DWORD objnum,
-                                    uint8_t*& pBuffer,
-                                    FX_DWORD& size) {
-  pBuffer = NULL;
-  size = 0;
-  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
-    return;
-  }
-  if (m_V5Type[objnum] == 2) {
-    CPDF_StreamAcc* pObjStream = GetObjectStream((FX_DWORD)m_CrossRef[objnum]);
-    if (pObjStream == NULL) {
-      return;
-    }
-    int32_t n = pObjStream->GetDict()->GetInteger(FX_BSTRC("N"));
-    int32_t offset = pObjStream->GetDict()->GetInteger(FX_BSTRC("First"));
-    CPDF_SyntaxParser syntax;
-    const uint8_t* pData = pObjStream->GetData();
-    FX_DWORD totalsize = pObjStream->GetSize();
-    CFX_SmartPointer<IFX_FileStream> file(
-        FX_CreateMemoryStream((uint8_t*)pData, (size_t)totalsize, FALSE));
-    syntax.InitParser(file.Get(), 0);
-    while (n) {
-      FX_DWORD thisnum = syntax.GetDirectNum();
-      FX_DWORD thisoff = syntax.GetDirectNum();
-      if (thisnum == objnum) {
-        if (n == 1) {
-          size = totalsize - (thisoff + offset);
-        } else {
-          syntax.GetDirectNum();  // Skip nextnum.
-          FX_DWORD nextoff = syntax.GetDirectNum();
-          size = nextoff - thisoff;
-        }
-        pBuffer = FX_Alloc(uint8_t, size);
-        FXSYS_memcpy(pBuffer, pData + thisoff + offset, size);
-        return;
-      }
-      n--;
-    }
-    return;
-  }
-  if (m_V5Type[objnum] == 1) {
-    FX_FILESIZE pos = m_CrossRef[objnum];
-    if (pos == 0) {
-      return;
-    }
-    FX_FILESIZE SavedPos = m_Syntax.SavePos();
-    m_Syntax.RestorePos(pos);
-    FX_BOOL bIsNumber;
-    CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
-    if (!bIsNumber) {
-      m_Syntax.RestorePos(SavedPos);
-      return;
-    }
-    FX_DWORD parser_objnum = FXSYS_atoi(word);
-    if (parser_objnum && parser_objnum != objnum) {
-      m_Syntax.RestorePos(SavedPos);
-      return;
-    }
-    word = m_Syntax.GetNextWord(bIsNumber);
-    if (!bIsNumber) {
-      m_Syntax.RestorePos(SavedPos);
-      return;
-    }
-    if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
-      m_Syntax.RestorePos(SavedPos);
-      return;
-    }
-    void* pResult =
-        FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-                      sizeof(FX_FILESIZE), _CompareFileSize);
-    if (pResult == NULL) {
-      m_Syntax.RestorePos(SavedPos);
-      return;
-    }
-    FX_FILESIZE nextoff = ((FX_FILESIZE*)pResult)[1];
-    FX_BOOL bNextOffValid = FALSE;
-    if (nextoff != pos) {
-      m_Syntax.RestorePos(nextoff);
-      word = m_Syntax.GetNextWord(bIsNumber);
-      if (word == FX_BSTRC("xref")) {
-        bNextOffValid = TRUE;
-      } else if (bIsNumber) {
-        word = m_Syntax.GetNextWord(bIsNumber);
-        if (bIsNumber && m_Syntax.GetKeyword() == FX_BSTRC("obj")) {
-          bNextOffValid = TRUE;
-        }
-      }
-    }
-    if (!bNextOffValid) {
-      m_Syntax.RestorePos(pos);
-      while (1) {
-        if (m_Syntax.GetKeyword() == FX_BSTRC("endobj")) {
-          break;
-        }
-        if (m_Syntax.SavePos() == m_Syntax.m_FileLen) {
-          break;
-        }
-      }
-      nextoff = m_Syntax.SavePos();
-    }
-    size = (FX_DWORD)(nextoff - pos);
-    pBuffer = FX_Alloc(uint8_t, size);
-    m_Syntax.RestorePos(pos);
-    m_Syntax.ReadBlock(pBuffer, size);
-    m_Syntax.RestorePos(SavedPos);
-  }
-}
-CPDF_Object* CPDF_Parser::ParseIndirectObjectAt(CPDF_IndirectObjects* pObjList,
-                                                FX_FILESIZE pos,
-                                                FX_DWORD objnum,
-                                                PARSE_CONTEXT* pContext) {
-  FX_FILESIZE SavedPos = m_Syntax.SavePos();
-  m_Syntax.RestorePos(pos);
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  FX_FILESIZE objOffset = m_Syntax.SavePos();
-  objOffset -= word.GetLength();
-  FX_DWORD parser_objnum = FXSYS_atoi(word);
-  if (objnum && parser_objnum != objnum) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  FX_DWORD parser_gennum = FXSYS_atoi(word);
-  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  CPDF_Object* pObj =
-      m_Syntax.GetObject(pObjList, objnum, parser_gennum, pContext);
-  m_Syntax.SavePos();
-  CFX_ByteString bsWord = m_Syntax.GetKeyword();
-  if (bsWord == FX_BSTRC("endobj")) {
-    m_Syntax.SavePos();
-  }
-  m_Syntax.RestorePos(SavedPos);
-  if (pObj) {
-    if (!objnum) {
-      pObj->m_ObjNum = parser_objnum;
-    }
-    pObj->m_GenNum = parser_gennum;
-  }
-  return pObj;
-}
-CPDF_Object* CPDF_Parser::ParseIndirectObjectAtByStrict(
-    CPDF_IndirectObjects* pObjList,
-    FX_FILESIZE pos,
-    FX_DWORD objnum,
-    struct PARSE_CONTEXT* pContext,
-    FX_FILESIZE* pResultPos) {
-  FX_FILESIZE SavedPos = m_Syntax.SavePos();
-  m_Syntax.RestorePos(pos);
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  FX_DWORD parser_objnum = FXSYS_atoi(word);
-  if (objnum && parser_objnum != objnum) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  FX_DWORD gennum = FXSYS_atoi(word);
-  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
-    m_Syntax.RestorePos(SavedPos);
-    return NULL;
-  }
-  CPDF_Object* pObj =
-      m_Syntax.GetObjectByStrict(pObjList, objnum, gennum, pContext);
-  if (pResultPos) {
-    *pResultPos = m_Syntax.m_Pos;
-  }
-  m_Syntax.RestorePos(SavedPos);
-  return pObj;
-}
-CPDF_Dictionary* CPDF_Parser::LoadTrailerV4() {
-  if (m_Syntax.GetKeyword() != FX_BSTRC("trailer")) {
-    return NULL;
-  }
-  CPDF_Object* pObj = m_Syntax.GetObject(m_pDocument, 0, 0, 0);
-  if (pObj == NULL || pObj->GetType() != PDFOBJ_DICTIONARY) {
-    if (pObj) {
-      pObj->Release();
-    }
-    return NULL;
-  }
-  return (CPDF_Dictionary*)pObj;
-}
-FX_DWORD CPDF_Parser::GetPermissions(FX_BOOL bCheckRevision) {
-  if (m_pSecurityHandler == NULL) {
-    return (FX_DWORD)-1;
-  }
-  FX_DWORD dwPermission = m_pSecurityHandler->GetPermissions();
-  if (m_pEncryptDict &&
-      m_pEncryptDict->GetString(FX_BSTRC("Filter")) == FX_BSTRC("Standard")) {
-    dwPermission &= 0xFFFFFFFC;
-    dwPermission |= 0xFFFFF0C0;
-    if (bCheckRevision && m_pEncryptDict->GetInteger(FX_BSTRC("R")) == 2) {
-      dwPermission &= 0xFFFFF0FF;
-    }
-  }
-  return dwPermission;
-}
-FX_BOOL CPDF_Parser::IsOwner() {
-  return m_pSecurityHandler == NULL ? TRUE : m_pSecurityHandler->IsOwner();
-}
-void CPDF_Parser::SetSecurityHandler(CPDF_SecurityHandler* pSecurityHandler,
-                                     FX_BOOL bForced) {
-  ASSERT(m_pSecurityHandler == NULL);
-  if (!m_bForceUseSecurityHandler) {
-    delete m_pSecurityHandler;
-    m_pSecurityHandler = NULL;
-  }
-  m_bForceUseSecurityHandler = bForced;
-  m_pSecurityHandler = pSecurityHandler;
-  if (m_bForceUseSecurityHandler) {
-    return;
-  }
-  m_Syntax.m_pCryptoHandler = pSecurityHandler->CreateCryptoHandler();
-  m_Syntax.m_pCryptoHandler->Init(NULL, pSecurityHandler);
-}
-FX_BOOL CPDF_Parser::IsLinearizedFile(IFX_FileRead* pFileAccess,
-                                      FX_DWORD offset) {
-  m_Syntax.InitParser(pFileAccess, offset);
-  m_Syntax.RestorePos(m_Syntax.m_HeaderOffset + 9);
-  FX_FILESIZE SavedPos = m_Syntax.SavePos();
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    return FALSE;
-  }
-  FX_DWORD objnum = FXSYS_atoi(word);
-  word = m_Syntax.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    return FALSE;
-  }
-  FX_DWORD gennum = FXSYS_atoi(word);
-  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
-    m_Syntax.RestorePos(SavedPos);
-    return FALSE;
-  }
-  m_pLinearized = m_Syntax.GetObject(NULL, objnum, gennum, 0);
-  if (!m_pLinearized) {
-    return FALSE;
-  }
-  if (m_pLinearized->GetDict() &&
-      m_pLinearized->GetDict()->GetElement(FX_BSTRC("Linearized"))) {
-    m_Syntax.GetNextWord(bIsNumber);
-    CPDF_Object* pLen = m_pLinearized->GetDict()->GetElement(FX_BSTRC("L"));
-    if (!pLen) {
-      m_pLinearized->Release();
-      m_pLinearized = NULL;
-      return FALSE;
-    }
-    if (pLen->GetInteger() != (int)pFileAccess->GetSize()) {
-      return FALSE;
-    }
-    CPDF_Object* pNo = m_pLinearized->GetDict()->GetElement(FX_BSTRC("P"));
-    if (pNo && pNo->GetType() == PDFOBJ_NUMBER) {
-      m_dwFirstPageNo = pNo->GetInteger();
-    }
-    CPDF_Object* pTable = m_pLinearized->GetDict()->GetElement(FX_BSTRC("T"));
-    if (pTable && pTable->GetType() == PDFOBJ_NUMBER) {
-      m_LastXRefOffset = pTable->GetInteger();
-    }
-    return TRUE;
-  }
-  m_pLinearized->Release();
-  m_pLinearized = NULL;
-  return FALSE;
-}
-FX_DWORD CPDF_Parser::StartAsynParse(IFX_FileRead* pFileAccess,
-                                     FX_BOOL bReParse,
-                                     FX_BOOL bOwnFileRead) {
-  CloseParser(bReParse);
-  m_bXRefStream = FALSE;
-  m_LastXRefOffset = 0;
-  m_bOwnFileRead = bOwnFileRead;
-  int32_t offset = GetHeaderOffset(pFileAccess);
-  if (offset == -1) {
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  if (!IsLinearizedFile(pFileAccess, offset)) {
-    m_Syntax.m_pFileAccess = NULL;
-    return StartParse(pFileAccess, bReParse, bOwnFileRead);
-  }
-  if (!bReParse) {
-    m_pDocument = new CPDF_Document(this);
-  }
-  FX_FILESIZE dwFirstXRefOffset = m_Syntax.SavePos();
-  FX_BOOL bXRefRebuilt = FALSE;
-  FX_BOOL bLoadV4 = FALSE;
-  if (!(bLoadV4 = LoadCrossRefV4(dwFirstXRefOffset, 0, FALSE, FALSE)) &&
-      !LoadCrossRefV5(dwFirstXRefOffset, dwFirstXRefOffset, TRUE)) {
-    if (!RebuildCrossRef()) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    bXRefRebuilt = TRUE;
-    m_LastXRefOffset = 0;
-  }
-  if (bLoadV4) {
-    m_pTrailer = LoadTrailerV4();
-    if (m_pTrailer == NULL) {
-      return FALSE;
-    }
-    int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
-    if (xrefsize > 0) {
-      m_CrossRef.SetSize(xrefsize);
-      m_V5Type.SetSize(xrefsize);
-    }
-  }
-  FX_DWORD dwRet = SetEncryptHandler();
-  if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-    return dwRet;
-  }
-  m_pDocument->LoadAsynDoc(m_pLinearized->GetDict());
-  if (m_pDocument->GetRoot() == NULL || m_pDocument->GetPageCount() == 0) {
-    if (bXRefRebuilt) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    ReleaseEncryptHandler();
-    if (!RebuildCrossRef()) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    dwRet = SetEncryptHandler();
-    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-      return dwRet;
-    }
-    m_pDocument->LoadAsynDoc(m_pLinearized->GetDict());
-    if (m_pDocument->GetRoot() == NULL) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-  }
-  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-              sizeof(FX_FILESIZE), _CompareFileSize);
-  FX_DWORD RootObjNum = GetRootObjNum();
-  if (RootObjNum == 0) {
-    ReleaseEncryptHandler();
-    RebuildCrossRef();
-    RootObjNum = GetRootObjNum();
-    if (RootObjNum == 0) {
-      return PDFPARSE_ERROR_FORMAT;
-    }
-    dwRet = SetEncryptHandler();
-    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-      return dwRet;
-    }
-  }
-  if (m_pSecurityHandler && m_pSecurityHandler->IsMetadataEncrypted()) {
-    CPDF_Object* pMetadata =
-        m_pDocument->GetRoot()->GetElement(FX_BSTRC("Metadata"));
-    if (pMetadata && pMetadata->GetType() == PDFOBJ_REFERENCE) {
-      m_Syntax.m_MetadataObjnum = ((CPDF_Reference*)pMetadata)->GetRefObjNum();
-    }
-  }
-  return PDFPARSE_ERROR_SUCCESS;
-}
-FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV5(FX_FILESIZE xrefpos) {
-  if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
-    return FALSE;
-  }
-  while (xrefpos)
-    if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
-      return FALSE;
-    }
-  m_ObjectStreamMap.InitHashTable(101, FALSE);
-  m_bXRefStream = TRUE;
-  return TRUE;
-}
-FX_DWORD CPDF_Parser::LoadLinearizedMainXRefTable() {
-  FX_DWORD dwSaveMetadataObjnum = m_Syntax.m_MetadataObjnum;
-  m_Syntax.m_MetadataObjnum = 0;
-  if (m_pTrailer) {
-    m_pTrailer->Release();
-    m_pTrailer = NULL;
-  }
-  m_Syntax.RestorePos(m_LastXRefOffset - m_Syntax.m_HeaderOffset);
-  uint8_t ch = 0;
-  FX_DWORD dwCount = 0;
-  m_Syntax.GetNextChar(ch);
-  int32_t type = PDF_CharType[ch];
-  while (type == 'W') {
-    ++dwCount;
-    if (m_Syntax.m_FileLen >=
-        (FX_FILESIZE)(m_Syntax.SavePos() + m_Syntax.m_HeaderOffset)) {
-      break;
-    }
-    m_Syntax.GetNextChar(ch);
-    type = PDF_CharType[ch];
-  }
-  m_LastXRefOffset += dwCount;
-  FX_POSITION pos = m_ObjectStreamMap.GetStartPosition();
-  while (pos) {
-    void* objnum;
-    CPDF_StreamAcc* pStream;
-    m_ObjectStreamMap.GetNextAssoc(pos, objnum, (void*&)pStream);
-    delete pStream;
-  }
-  m_ObjectStreamMap.RemoveAll();
-  if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
-      !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
-    m_LastXRefOffset = 0;
-    m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
-    return PDFPARSE_ERROR_FORMAT;
-  }
-  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
-              sizeof(FX_FILESIZE), _CompareFileSize);
-  m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
-  return PDFPARSE_ERROR_SUCCESS;
-}
-
-// static
-int CPDF_SyntaxParser::s_CurrentRecursionDepth = 0;
-
-CPDF_SyntaxParser::CPDF_SyntaxParser() {
-  m_pFileAccess = NULL;
-  m_pCryptoHandler = NULL;
-  m_pFileBuf = NULL;
-  m_BufSize = CPDF_ModuleMgr::kFileBufSize;
-  m_pFileBuf = NULL;
-  m_MetadataObjnum = 0;
-  m_dwWordPos = 0;
-  m_bFileStream = FALSE;
-}
-CPDF_SyntaxParser::~CPDF_SyntaxParser() {
-  FX_Free(m_pFileBuf);
-}
-FX_BOOL CPDF_SyntaxParser::GetCharAt(FX_FILESIZE pos, uint8_t& ch) {
-  FX_FILESIZE save_pos = m_Pos;
-  m_Pos = pos;
-  FX_BOOL ret = GetNextChar(ch);
-  m_Pos = save_pos;
-  return ret;
-}
-FX_BOOL CPDF_SyntaxParser::GetNextChar(uint8_t& ch) {
-  FX_FILESIZE pos = m_Pos + m_HeaderOffset;
-  if (pos >= m_FileLen) {
-    return FALSE;
-  }
-  if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
-    FX_FILESIZE read_pos = pos;
-    FX_DWORD read_size = m_BufSize;
-    if ((FX_FILESIZE)read_size > m_FileLen) {
-      read_size = (FX_DWORD)m_FileLen;
-    }
-    if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
-      if (m_FileLen < (FX_FILESIZE)read_size) {
-        read_pos = 0;
-        read_size = (FX_DWORD)m_FileLen;
-      } else {
-        read_pos = m_FileLen - read_size;
-      }
-    }
-    if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) {
-      return FALSE;
-    }
-    m_BufOffset = read_pos;
-  }
-  ch = m_pFileBuf[pos - m_BufOffset];
-  m_Pos++;
-  return TRUE;
-}
-FX_BOOL CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch) {
-  pos += m_HeaderOffset;
-  if (pos >= m_FileLen) {
-    return FALSE;
-  }
-  if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
-    FX_FILESIZE read_pos;
-    if (pos < (FX_FILESIZE)m_BufSize) {
-      read_pos = 0;
-    } else {
-      read_pos = pos - m_BufSize + 1;
-    }
-    FX_DWORD read_size = m_BufSize;
-    if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
-      if (m_FileLen < (FX_FILESIZE)read_size) {
-        read_pos = 0;
-        read_size = (FX_DWORD)m_FileLen;
-      } else {
-        read_pos = m_FileLen - read_size;
-      }
-    }
-    if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) {
-      return FALSE;
-    }
-    m_BufOffset = read_pos;
-  }
-  ch = m_pFileBuf[pos - m_BufOffset];
-  return TRUE;
-}
-FX_BOOL CPDF_SyntaxParser::ReadBlock(uint8_t* pBuf, FX_DWORD size) {
-  if (!m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size)) {
-    return FALSE;
-  }
-  m_Pos += size;
-  return TRUE;
-}
-#define MAX_WORD_BUFFER 256
-void CPDF_SyntaxParser::GetNextWord() {
-  m_WordSize = 0;
-  m_bIsNumber = TRUE;
-  uint8_t ch;
-  if (!GetNextChar(ch)) {
-    return;
-  }
-  uint8_t type = PDF_CharType[ch];
-  while (1) {
-    while (type == 'W') {
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      type = PDF_CharType[ch];
-    }
-    if (ch != '%') {
-      break;
-    }
-    while (1) {
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      if (ch == '\r' || ch == '\n') {
-        break;
-      }
-    }
-    type = PDF_CharType[ch];
-  }
-  if (type == 'D') {
-    m_bIsNumber = FALSE;
-    m_WordBuffer[m_WordSize++] = ch;
-    if (ch == '/') {
-      while (1) {
-        if (!GetNextChar(ch)) {
-          return;
-        }
-        type = PDF_CharType[ch];
-        if (type != 'R' && type != 'N') {
-          m_Pos--;
-          return;
-        }
-        if (m_WordSize < MAX_WORD_BUFFER) {
-          m_WordBuffer[m_WordSize++] = ch;
-        }
-      }
-    } else if (ch == '<') {
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      if (ch == '<') {
-        m_WordBuffer[m_WordSize++] = ch;
-      } else {
-        m_Pos--;
-      }
-    } else if (ch == '>') {
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      if (ch == '>') {
-        m_WordBuffer[m_WordSize++] = ch;
-      } else {
-        m_Pos--;
-      }
-    }
-    return;
-  }
-  while (1) {
-    if (m_WordSize < MAX_WORD_BUFFER) {
-      m_WordBuffer[m_WordSize++] = ch;
-    }
-    if (type != 'N') {
-      m_bIsNumber = FALSE;
-    }
-    if (!GetNextChar(ch)) {
-      return;
-    }
-    type = PDF_CharType[ch];
-    if (type == 'D' || type == 'W') {
-      m_Pos--;
-      break;
-    }
-  }
-}
-CFX_ByteString CPDF_SyntaxParser::ReadString() {
-  uint8_t ch;
-  if (!GetNextChar(ch)) {
-    return CFX_ByteString();
-  }
-  CFX_ByteTextBuf buf;
-  int32_t parlevel = 0;
-  int32_t status = 0, iEscCode = 0;
-  while (1) {
-    switch (status) {
-      case 0:
-        if (ch == ')') {
-          if (parlevel == 0) {
-            return buf.GetByteString();
-          }
-          parlevel--;
-          buf.AppendChar(')');
-        } else if (ch == '(') {
-          parlevel++;
-          buf.AppendChar('(');
-        } else if (ch == '\\') {
-          status = 1;
-        } else {
-          buf.AppendChar(ch);
-        }
-        break;
-      case 1:
-        if (ch >= '0' && ch <= '7') {
-          iEscCode = ch - '0';
-          status = 2;
-          break;
-        }
-        if (ch == 'n') {
-          buf.AppendChar('\n');
-        } else if (ch == 'r') {
-          buf.AppendChar('\r');
-        } else if (ch == 't') {
-          buf.AppendChar('\t');
-        } else if (ch == 'b') {
-          buf.AppendChar('\b');
-        } else if (ch == 'f') {
-          buf.AppendChar('\f');
-        } else if (ch == '\r') {
-          status = 4;
-          break;
-        } else if (ch == '\n') {
-        } else {
-          buf.AppendChar(ch);
-        }
-        status = 0;
-        break;
-      case 2:
-        if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + ch - '0';
-          status = 3;
-        } else {
-          buf.AppendChar(iEscCode);
-          status = 0;
-          continue;
-        }
-        break;
-      case 3:
-        if (ch >= '0' && ch <= '7') {
-          iEscCode = iEscCode * 8 + ch - '0';
-          buf.AppendChar(iEscCode);
-          status = 0;
-        } else {
-          buf.AppendChar(iEscCode);
-          status = 0;
-          continue;
-        }
-        break;
-      case 4:
-        status = 0;
-        if (ch != '\n') {
-          continue;
-        }
-        break;
-    }
-    if (!GetNextChar(ch)) {
-      break;
-    }
-  }
-  GetNextChar(ch);
-  return buf.GetByteString();
-}
-CFX_ByteString CPDF_SyntaxParser::ReadHexString() {
-  uint8_t ch;
-  if (!GetNextChar(ch)) {
-    return CFX_ByteString();
-  }
-  CFX_BinaryBuf buf;
-  FX_BOOL bFirst = TRUE;
-  uint8_t code = 0;
-  while (1) {
-    if (ch == '>') {
-      break;
-    }
-    if (ch >= '0' && ch <= '9') {
-      if (bFirst) {
-        code = (ch - '0') * 16;
-      } else {
-        code += ch - '0';
-        buf.AppendByte((uint8_t)code);
-      }
-      bFirst = !bFirst;
-    } else if (ch >= 'A' && ch <= 'F') {
-      if (bFirst) {
-        code = (ch - 'A' + 10) * 16;
-      } else {
-        code += ch - 'A' + 10;
-        buf.AppendByte((uint8_t)code);
-      }
-      bFirst = !bFirst;
-    } else if (ch >= 'a' && ch <= 'f') {
-      if (bFirst) {
-        code = (ch - 'a' + 10) * 16;
-      } else {
-        code += ch - 'a' + 10;
-        buf.AppendByte((uint8_t)code);
-      }
-      bFirst = !bFirst;
-    }
-    if (!GetNextChar(ch)) {
-      break;
-    }
-  }
-  if (!bFirst) {
-    buf.AppendByte((uint8_t)code);
-  }
-  return buf.GetByteString();
-}
-void CPDF_SyntaxParser::ToNextLine() {
-  uint8_t ch;
-  while (GetNextChar(ch)) {
-    if (ch == '\n') {
-      break;
-    }
-    if (ch == '\r') {
-      GetNextChar(ch);
-      if (ch != '\n') {
-        --m_Pos;
-      }
-      break;
-    }
-  }
-}
-void CPDF_SyntaxParser::ToNextWord() {
-  uint8_t ch;
-  if (!GetNextChar(ch)) {
-    return;
-  }
-  uint8_t type = PDF_CharType[ch];
-  while (1) {
-    while (type == 'W') {
-      m_dwWordPos = m_Pos;
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      type = PDF_CharType[ch];
-    }
-    if (ch != '%') {
-      break;
-    }
-    while (1) {
-      if (!GetNextChar(ch)) {
-        return;
-      }
-      if (ch == '\r' || ch == '\n') {
-        break;
-      }
-    }
-    type = PDF_CharType[ch];
-  }
-  m_Pos--;
-}
-CFX_ByteString CPDF_SyntaxParser::GetNextWord(FX_BOOL& bIsNumber) {
-  GetNextWord();
-  bIsNumber = m_bIsNumber;
-  return CFX_ByteString((const FX_CHAR*)m_WordBuffer, m_WordSize);
-}
-CFX_ByteString CPDF_SyntaxParser::GetKeyword() {
-  GetNextWord();
-  return CFX_ByteString((const FX_CHAR*)m_WordBuffer, m_WordSize);
-}
-CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects* pObjList,
-                                          FX_DWORD objnum,
-                                          FX_DWORD gennum,
-                                          PARSE_CONTEXT* pContext,
-                                          FX_BOOL bDecrypt) {
-  CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
-  if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) {
-    return NULL;
-  }
-  FX_FILESIZE SavedPos = m_Pos;
-  FX_BOOL bTypeOnly = pContext && (pContext->m_Flags & PDFPARSE_TYPEONLY);
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = GetNextWord(bIsNumber);
-  if (word.GetLength() == 0) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_INVALID;
-    }
-    return NULL;
-  }
-  if (bIsNumber) {
-    FX_FILESIZE SavedPos = m_Pos;
-    CFX_ByteString nextword = GetNextWord(bIsNumber);
-    if (bIsNumber) {
-      CFX_ByteString nextword2 = GetNextWord(bIsNumber);
-      if (nextword2 == FX_BSTRC("R")) {
-        FX_DWORD objnum = FXSYS_atoi(word);
-        if (bTypeOnly) {
-          return (CPDF_Object*)PDFOBJ_REFERENCE;
-        }
-        return new CPDF_Reference(pObjList, objnum);
-      }
-    }
-    m_Pos = SavedPos;
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NUMBER;
-    }
-    return CPDF_Number::Create(word);
-  }
-  if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_BOOLEAN;
-    }
-    return CPDF_Boolean::Create(word == FX_BSTRC("true"));
-  }
-  if (word == FX_BSTRC("null")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NULL;
-    }
-    return CPDF_Null::Create();
-  }
-  if (word == FX_BSTRC("(")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_STRING;
-    }
-    CFX_ByteString str = ReadString();
-    if (m_pCryptoHandler && bDecrypt) {
-      m_pCryptoHandler->Decrypt(objnum, gennum, str);
-    }
-    return CPDF_String::Create(str, FALSE);
-  }
-  if (word == FX_BSTRC("<")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_STRING;
-    }
-    CFX_ByteString str = ReadHexString();
-    if (m_pCryptoHandler && bDecrypt) {
-      m_pCryptoHandler->Decrypt(objnum, gennum, str);
-    }
-    return CPDF_String::Create(str, TRUE);
-  }
-  if (word == FX_BSTRC("[")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_ARRAY;
-    }
-    CPDF_Array* pArray = CPDF_Array::Create();
-    while (1) {
-      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
-      if (pObj == NULL) {
-        return pArray;
-      }
-      pArray->Add(pObj);
-    }
-  }
-  if (word[0] == '/') {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NAME;
-    }
-    return CPDF_Name::Create(
-        PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1)));
-  }
-  if (word == FX_BSTRC("<<")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_DICTIONARY;
-    }
-    if (pContext) {
-      pContext->m_DictStart = SavedPos;
-    }
-    CPDF_Dictionary* pDict = CPDF_Dictionary::Create();
-    int32_t nKeys = 0;
-    FX_FILESIZE dwSignValuePos = 0;
-    while (1) {
-      FX_BOOL bIsNumber;
-      CFX_ByteString key = GetNextWord(bIsNumber);
-      if (key.IsEmpty()) {
-        if (pDict)
-          pDict->Release();
-        return NULL;
-      }
-      FX_FILESIZE SavedPos = m_Pos - key.GetLength();
-      if (key == FX_BSTRC(">>")) {
-        break;
-      }
-      if (key == FX_BSTRC("endobj")) {
-        m_Pos = SavedPos;
-        break;
-      }
-      if (key[0] != '/') {
-        continue;
-      }
-      nKeys++;
-      key = PDF_NameDecode(key);
-      if (key == FX_BSTRC("/Contents")) {
-        dwSignValuePos = m_Pos;
-      }
-      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
-      if (pObj == NULL) {
-        continue;
-      }
-      if (key.GetLength() >= 1) {
-        if (nKeys < 32) {
-          pDict->SetAt(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
-                       pObj);
-        } else {
-          pDict->AddValue(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
-                          pObj);
-        }
-      }
-    }
-    if (IsSignatureDict(pDict)) {
-      FX_FILESIZE dwSavePos = m_Pos;
-      m_Pos = dwSignValuePos;
-      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum, NULL, FALSE);
-      pDict->SetAt(FX_BSTRC("Contents"), pObj);
-      m_Pos = dwSavePos;
-    }
-    if (pContext) {
-      pContext->m_DictEnd = m_Pos;
-      if (pContext->m_Flags & PDFPARSE_NOSTREAM) {
-        return pDict;
-      }
-    }
-    FX_FILESIZE SavedPos = m_Pos;
-    FX_BOOL bIsNumber;
-    CFX_ByteString nextword = GetNextWord(bIsNumber);
-    if (nextword == FX_BSTRC("stream")) {
-      CPDF_Stream* pStream = ReadStream(pDict, pContext, objnum, gennum);
-      if (pStream) {
-        return pStream;
-      }
-      if (pDict)
-        pDict->Release();
-      return NULL;
-    } else {
-      m_Pos = SavedPos;
-      return pDict;
-    }
-  }
-  if (word == FX_BSTRC(">>")) {
-    m_Pos = SavedPos;
-    return NULL;
-  }
-  if (bTypeOnly) {
-    return (CPDF_Object*)PDFOBJ_INVALID;
-  }
-  return NULL;
-}
-CPDF_Object* CPDF_SyntaxParser::GetObjectByStrict(
-    CPDF_IndirectObjects* pObjList,
-    FX_DWORD objnum,
-    FX_DWORD gennum,
-    struct PARSE_CONTEXT* pContext) {
-  CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
-  if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) {
-    return NULL;
-  }
-  FX_FILESIZE SavedPos = m_Pos;
-  FX_BOOL bTypeOnly = pContext && (pContext->m_Flags & PDFPARSE_TYPEONLY);
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = GetNextWord(bIsNumber);
-  if (word.GetLength() == 0) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_INVALID;
-    }
-    return NULL;
-  }
-  if (bIsNumber) {
-    FX_FILESIZE SavedPos = m_Pos;
-    CFX_ByteString nextword = GetNextWord(bIsNumber);
-    if (bIsNumber) {
-      CFX_ByteString nextword2 = GetNextWord(bIsNumber);
-      if (nextword2 == FX_BSTRC("R")) {
-        if (bTypeOnly) {
-          return (CPDF_Object*)PDFOBJ_REFERENCE;
-        }
-        FX_DWORD objnum = FXSYS_atoi(word);
-        return new CPDF_Reference(pObjList, objnum);
-      }
-    }
-    m_Pos = SavedPos;
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NUMBER;
-    }
-    return CPDF_Number::Create(word);
-  }
-  if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_BOOLEAN;
-    }
-    return CPDF_Boolean::Create(word == FX_BSTRC("true"));
-  }
-  if (word == FX_BSTRC("null")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NULL;
-    }
-    return CPDF_Null::Create();
-  }
-  if (word == FX_BSTRC("(")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_STRING;
-    }
-    CFX_ByteString str = ReadString();
-    if (m_pCryptoHandler) {
-      m_pCryptoHandler->Decrypt(objnum, gennum, str);
-    }
-    return CPDF_String::Create(str, FALSE);
-  }
-  if (word == FX_BSTRC("<")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_STRING;
-    }
-    CFX_ByteString str = ReadHexString();
-    if (m_pCryptoHandler) {
-      m_pCryptoHandler->Decrypt(objnum, gennum, str);
-    }
-    return CPDF_String::Create(str, TRUE);
-  }
-  if (word == FX_BSTRC("[")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_ARRAY;
-    }
-    CPDF_Array* pArray = CPDF_Array::Create();
-    while (1) {
-      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
-      if (pObj == NULL) {
-        if (m_WordBuffer[0] == ']') {
-          return pArray;
-        }
-        if (pArray) {
-          pArray->Release();
-        }
-        return NULL;
-      }
-      pArray->Add(pObj);
-    }
-  }
-  if (word[0] == '/') {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_NAME;
-    }
-    return CPDF_Name::Create(
-        PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1)));
-  }
-  if (word == FX_BSTRC("<<")) {
-    if (bTypeOnly) {
-      return (CPDF_Object*)PDFOBJ_DICTIONARY;
-    }
-    if (pContext) {
-      pContext->m_DictStart = SavedPos;
-    }
-    CPDF_Dictionary* pDict = CPDF_Dictionary::Create();
-    while (1) {
-      FX_BOOL bIsNumber;
-      FX_FILESIZE SavedPos = m_Pos;
-      CFX_ByteString key = GetNextWord(bIsNumber);
-      if (key.IsEmpty()) {
-        if (pDict) {
-          pDict->Release();
-        }
-        return NULL;
-      }
-      if (key == FX_BSTRC(">>")) {
-        break;
-      }
-      if (key == FX_BSTRC("endobj")) {
-        m_Pos = SavedPos;
-        break;
-      }
-      if (key[0] != '/') {
-        continue;
-      }
-      key = PDF_NameDecode(key);
-      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
-      if (pObj == NULL) {
-        if (pDict) {
-          pDict->Release();
-        }
-        uint8_t ch;
-        while (1) {
-          if (!GetNextChar(ch)) {
-            break;
-          }
-          if (ch == 0x0A || ch == 0x0D) {
-            break;
-          }
-        }
-        return NULL;
-      }
-      if (key.GetLength() > 1) {
-        pDict->AddValue(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
-                        pObj);
-      }
-    }
-    if (pContext) {
-      pContext->m_DictEnd = m_Pos;
-      if (pContext->m_Flags & PDFPARSE_NOSTREAM) {
-        return pDict;
-      }
-    }
-    FX_FILESIZE SavedPos = m_Pos;
-    FX_BOOL bIsNumber;
-    CFX_ByteString nextword = GetNextWord(bIsNumber);
-    if (nextword == FX_BSTRC("stream")) {
-      CPDF_Stream* pStream = ReadStream(pDict, pContext, objnum, gennum);
-      if (pStream) {
-        return pStream;
-      }
-      if (pDict) {
-        pDict->Release();
-      }
-      return NULL;
-    } else {
-      m_Pos = SavedPos;
-      return pDict;
-    }
-  }
-  if (word == FX_BSTRC(">>")) {
-    m_Pos = SavedPos;
-    return NULL;
-  }
-  if (bTypeOnly) {
-    return (CPDF_Object*)PDFOBJ_INVALID;
-  }
-  return NULL;
-}
-unsigned int CPDF_SyntaxParser::ReadEOLMarkers(FX_FILESIZE pos) {
-  unsigned char byte1 = 0;
-  unsigned char byte2 = 0;
-  GetCharAt(pos, byte1);
-  GetCharAt(pos + 1, byte2);
-  unsigned int markers = 0;
-  if (byte1 == '\r' && byte2 == '\n') {
-    markers = 2;
-  } else if (byte1 == '\r' || byte1 == '\n') {
-    markers = 1;
-  }
-  return markers;
-}
-CPDF_Stream* CPDF_SyntaxParser::ReadStream(CPDF_Dictionary* pDict,
-                                           PARSE_CONTEXT* pContext,
-                                           FX_DWORD objnum,
-                                           FX_DWORD gennum) {
-  CPDF_Object* pLenObj = pDict->GetElement(FX_BSTRC("Length"));
-  FX_FILESIZE len = -1;
-  if (pLenObj && ((pLenObj->GetType() != PDFOBJ_REFERENCE) ||
-                  ((((CPDF_Reference*)pLenObj)->GetObjList()) &&
-                   ((CPDF_Reference*)pLenObj)->GetRefObjNum() != objnum))) {
-    len = pLenObj->GetInteger();
-  }
-  // Check whether end of line markers follow the keyword 'stream'.
-  unsigned int numMarkers = ReadEOLMarkers(m_Pos);
-  m_Pos += numMarkers;
-  FX_FILESIZE streamStartPos = m_Pos;
-  if (pContext) {
-    pContext->m_DataStart = streamStartPos;
-  }
-  const unsigned int ENDSTREAM_LEN = sizeof("endstream") - 1;
-  const unsigned int ENDOBJ_LEN = sizeof("endobj") - 1;
-  CPDF_CryptoHandler* pCryptoHandler =
-      objnum == (FX_DWORD)m_MetadataObjnum ? nullptr : m_pCryptoHandler;
-  if (!pCryptoHandler) {
-    FX_BOOL bSearchForKeyword = TRUE;
-    unsigned int prevMarkers = 0;
-    unsigned int nextMarkers = 0;
-    if (len >= 0) {
-      pdfium::base::CheckedNumeric<FX_FILESIZE> pos = m_Pos;
-      pos += len;
-      if (pos.IsValid() && pos.ValueOrDie() < m_FileLen) {
-        m_Pos = pos.ValueOrDie();
-      }
-      prevMarkers = ReadEOLMarkers(m_Pos);
-      GetNextWord();
-      nextMarkers = ReadEOLMarkers(m_Pos);
-      if (m_WordSize == ENDSTREAM_LEN && prevMarkers != 0 && nextMarkers != 0 &&
-          FXSYS_memcmp(m_WordBuffer, "endstream", ENDSTREAM_LEN) == 0) {
-        bSearchForKeyword = FALSE;
-      }
-    }
-    if (bSearchForKeyword) {
-      // If len is not available, len needs to be calculated
-      // by searching the keywords "endstream" or "endobj".
-      m_Pos = streamStartPos;
-      FX_FILESIZE endStreamOffset = 0;
-      while (endStreamOffset >= 0) {
-        endStreamOffset = FindTag(FX_BSTRC("endstream"), 0);
-        if (endStreamOffset < 0) {
-          // Can't find any "endstream".
-          break;
-        }
-        prevMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 1);
-        nextMarkers =
-            ReadEOLMarkers(streamStartPos + endStreamOffset + ENDSTREAM_LEN);
-        if (prevMarkers != 0 && nextMarkers != 0) {
-          // Stop searching when the keyword "endstream" is found.
-          break;
-        } else {
-          unsigned char ch = 0x00;
-          GetCharAt(streamStartPos + endStreamOffset + ENDSTREAM_LEN, ch);
-          if (ch == 0x09 || ch == 0x20) {
-            //"endstream" is treated as a keyword
-            // when it is followed by a tab or whitespace
-            break;
-          }
-        }
-        m_Pos += ENDSTREAM_LEN;
-      }
-      m_Pos = streamStartPos;
-      FX_FILESIZE endObjOffset = 0;
-      while (endObjOffset >= 0) {
-        endObjOffset = FindTag(FX_BSTRC("endobj"), 0);
-        if (endObjOffset < 0) {
-          // Can't find any "endobj".
-          break;
-        }
-        prevMarkers = ReadEOLMarkers(streamStartPos + endObjOffset - 1);
-        nextMarkers =
-            ReadEOLMarkers(streamStartPos + endObjOffset + ENDOBJ_LEN);
-        if (prevMarkers != 0 && nextMarkers != 0) {
-          // Stop searching when the keyword "endobj" is found.
-          break;
-        }
-        m_Pos += ENDOBJ_LEN;
-      }
-      if (endStreamOffset < 0 && endObjOffset < 0) {
-        // Can't find "endstream" or "endobj".
-        return nullptr;
-      }
-      if (endStreamOffset < 0 && endObjOffset >= 0) {
-        // Correct the position of end stream.
-        endStreamOffset = endObjOffset;
-      } else if (endStreamOffset >= 0 && endObjOffset < 0) {
-        // Correct the position of end obj.
-        endObjOffset = endStreamOffset;
-      } else if (endStreamOffset > endObjOffset) {
-        endStreamOffset = endObjOffset;
-      }
-      len = endStreamOffset;
-      numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 2);
-      if (numMarkers == 2) {
-        len -= 2;
-      } else {
-        numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 1);
-        if (numMarkers == 1) {
-          len -= 1;
-        }
-      }
-      if (len <= 0) {
-        return nullptr;
-      }
-      pDict->SetAtInteger(FX_BSTRC("Length"), len);
-    }
-    m_Pos = streamStartPos;
-  }
-  if (len <= 0) {
-    return nullptr;
-  }
-  uint8_t* pData = FX_Alloc(uint8_t, len);
-  ReadBlock(pData, len);
-  if (pCryptoHandler) {
-    CFX_BinaryBuf dest_buf;
-    dest_buf.EstimateSize(pCryptoHandler->DecryptGetSize(len));
-    void* context = pCryptoHandler->DecryptStart(objnum, gennum);
-    pCryptoHandler->DecryptStream(context, pData, len, dest_buf);
-    pCryptoHandler->DecryptFinish(context, dest_buf);
-    FX_Free(pData);
-    pData = dest_buf.GetBuffer();
-    len = dest_buf.GetSize();
-    dest_buf.DetachBuffer();
-  }
-  CPDF_Stream* pStream = new CPDF_Stream(pData, len, pDict);
-  if (pContext) {
-    pContext->m_DataEnd = pContext->m_DataStart + len;
-  }
-  streamStartPos = m_Pos;
-  GetNextWord();
-  numMarkers = ReadEOLMarkers(m_Pos);
-  if (m_WordSize == ENDOBJ_LEN && numMarkers != 0 &&
-      FXSYS_memcmp(m_WordBuffer, "endobj", ENDOBJ_LEN) == 0) {
-    m_Pos = streamStartPos;
-  }
-  return pStream;
-}
-void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess,
-                                   FX_DWORD HeaderOffset) {
-  FX_Free(m_pFileBuf);
-  m_pFileBuf = FX_Alloc(uint8_t, m_BufSize);
-  m_HeaderOffset = HeaderOffset;
-  m_FileLen = pFileAccess->GetSize();
-  m_Pos = 0;
-  m_pFileAccess = pFileAccess;
-  m_BufOffset = 0;
-  pFileAccess->ReadBlock(
-      m_pFileBuf, 0,
-      (size_t)((FX_FILESIZE)m_BufSize > m_FileLen ? m_FileLen : m_BufSize));
-}
-int32_t CPDF_SyntaxParser::GetDirectNum() {
-  GetNextWord();
-  if (!m_bIsNumber) {
-    return 0;
-  }
-  m_WordBuffer[m_WordSize] = 0;
-  return FXSYS_atoi((const FX_CHAR*)m_WordBuffer);
-}
-FX_BOOL CPDF_SyntaxParser::IsWholeWord(FX_FILESIZE startpos,
-                                       FX_FILESIZE limit,
-                                       const uint8_t* tag,
-                                       FX_DWORD taglen) {
-  uint8_t type = PDF_CharType[tag[0]];
-  FX_BOOL bCheckLeft = type != 'D' && type != 'W';
-  type = PDF_CharType[tag[taglen - 1]];
-  FX_BOOL bCheckRight = type != 'D' && type != 'W';
-  uint8_t ch;
-  if (bCheckRight && startpos + (int32_t)taglen <= limit &&
-      GetCharAt(startpos + (int32_t)taglen, ch)) {
-    uint8_t type = PDF_CharType[ch];
-    if (type == 'N' || type == 'R') {
-      return FALSE;
-    }
-  }
-  if (bCheckLeft && startpos > 0 && GetCharAt(startpos - 1, ch)) {
-    uint8_t type = PDF_CharType[ch];
-    if (type == 'N' || type == 'R') {
-      return FALSE;
-    }
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_SyntaxParser::SearchWord(const CFX_ByteStringC& tag,
-                                      FX_BOOL bWholeWord,
-                                      FX_BOOL bForward,
-                                      FX_FILESIZE limit) {
-  int32_t taglen = tag.GetLength();
-  if (taglen == 0) {
-    return FALSE;
-  }
-  FX_FILESIZE pos = m_Pos;
-  int32_t offset = 0;
-  if (!bForward) {
-    offset = taglen - 1;
-  }
-  const uint8_t* tag_data = tag.GetPtr();
-  uint8_t byte;
-  while (1) {
-    if (bForward) {
-      if (limit) {
-        if (pos >= m_Pos + limit) {
-          return FALSE;
-        }
-      }
-      if (!GetCharAt(pos, byte)) {
-        return FALSE;
-      }
-    } else {
-      if (limit) {
-        if (pos <= m_Pos - limit) {
-          return FALSE;
-        }
-      }
-      if (!GetCharAtBackward(pos, byte)) {
-        return FALSE;
-      }
-    }
-    if (byte == tag_data[offset]) {
-      if (bForward) {
-        offset++;
-        if (offset < taglen) {
-          pos++;
-          continue;
-        }
-      } else {
-        offset--;
-        if (offset >= 0) {
-          pos--;
-          continue;
-        }
-      }
-      FX_FILESIZE startpos = bForward ? pos - taglen + 1 : pos;
-      if (!bWholeWord || IsWholeWord(startpos, limit, tag.GetPtr(), taglen)) {
-        m_Pos = startpos;
-        return TRUE;
-      }
-    }
-    if (bForward) {
-      offset = byte == tag_data[0] ? 1 : 0;
-      pos++;
-    } else {
-      offset = byte == tag_data[taglen - 1] ? taglen - 2 : taglen - 1;
-      pos--;
-    }
-    if (pos < 0) {
-      return FALSE;
-    }
-  }
-  return FALSE;
-}
-struct _SearchTagRecord {
-  const uint8_t* m_pTag;
-  FX_DWORD m_Len;
-  FX_DWORD m_Offset;
-};
-int32_t CPDF_SyntaxParser::SearchMultiWord(const CFX_ByteStringC& tags,
-                                           FX_BOOL bWholeWord,
-                                           FX_FILESIZE limit) {
-  int32_t ntags = 1, i;
-  for (i = 0; i < tags.GetLength(); i++)
-    if (tags[i] == 0) {
-      ntags++;
-    }
-  _SearchTagRecord* pPatterns = FX_Alloc(_SearchTagRecord, ntags);
-  FX_DWORD start = 0, itag = 0, max_len = 0;
-  for (i = 0; i <= tags.GetLength(); i++) {
-    if (tags[i] == 0) {
-      FX_DWORD len = i - start;
-      if (len > max_len) {
-        max_len = len;
-      }
-      pPatterns[itag].m_pTag = tags.GetPtr() + start;
-      pPatterns[itag].m_Len = len;
-      pPatterns[itag].m_Offset = 0;
-      start = i + 1;
-      itag++;
-    }
-  }
-  FX_FILESIZE pos = m_Pos;
-  uint8_t byte;
-  GetCharAt(pos++, byte);
-  int32_t found = -1;
-  while (1) {
-    for (i = 0; i < ntags; i++) {
-      if (pPatterns[i].m_pTag[pPatterns[i].m_Offset] == byte) {
-        pPatterns[i].m_Offset++;
-        if (pPatterns[i].m_Offset == pPatterns[i].m_Len) {
-          if (!bWholeWord ||
-              IsWholeWord(pos - pPatterns[i].m_Len, limit, pPatterns[i].m_pTag,
-                          pPatterns[i].m_Len)) {
-            found = i;
-            goto end;
-          } else {
-            if (pPatterns[i].m_pTag[0] == byte) {
-              pPatterns[i].m_Offset = 1;
-            } else {
-              pPatterns[i].m_Offset = 0;
-            }
-          }
-        }
-      } else {
-        if (pPatterns[i].m_pTag[0] == byte) {
-          pPatterns[i].m_Offset = 1;
-        } else {
-          pPatterns[i].m_Offset = 0;
-        }
-      }
-    }
-    if (limit && pos >= m_Pos + limit) {
-      goto end;
-    }
-    if (!GetCharAt(pos, byte)) {
-      goto end;
-    }
-    pos++;
-  }
-end:
-  FX_Free(pPatterns);
-  return found;
-}
-FX_FILESIZE CPDF_SyntaxParser::FindTag(const CFX_ByteStringC& tag,
-                                       FX_FILESIZE limit) {
-  int32_t taglen = tag.GetLength();
-  int32_t match = 0;
-  limit += m_Pos;
-  FX_FILESIZE startpos = m_Pos;
-  while (1) {
-    uint8_t ch;
-    if (!GetNextChar(ch)) {
-      return -1;
-    }
-    if (ch == tag[match]) {
-      match++;
-      if (match == taglen) {
-        return m_Pos - startpos - taglen;
-      }
-    } else {
-      match = ch == tag[0] ? 1 : 0;
-    }
-    if (limit && m_Pos == limit) {
-      return -1;
-    }
-  }
-  return -1;
-}
-void CPDF_SyntaxParser::GetBinary(uint8_t* buffer, FX_DWORD size) {
-  FX_DWORD offset = 0;
-  uint8_t ch;
-  while (1) {
-    if (!GetNextChar(ch)) {
-      return;
-    }
-    buffer[offset++] = ch;
-    if (offset == size) {
-      break;
-    }
-  }
-}
-
-class CPDF_DataAvail final : public IPDF_DataAvail {
- public:
-  CPDF_DataAvail(IFX_FileAvail* pFileAvail, IFX_FileRead* pFileRead);
-  ~CPDF_DataAvail() override;
-
-  virtual FX_BOOL IsDocAvail(IFX_DownloadHints* pHints) override;
-
-  virtual void SetDocument(CPDF_Document* pDoc) override;
-
-  virtual FX_BOOL IsPageAvail(int iPage, IFX_DownloadHints* pHints) override;
-
-  virtual int32_t IsFormAvail(IFX_DownloadHints* pHints) override;
-
-  virtual int32_t IsLinearizedPDF() override;
-
-  virtual FX_BOOL IsLinearized() override { return m_bLinearized; }
-
-  virtual void GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
-                                         FX_DWORD* pSize) override;
-
- protected:
-  static const int kMaxDataAvailRecursionDepth = 64;
-  static int s_CurrentDataAvailRecursionDepth;
-
-  FX_DWORD GetObjectSize(FX_DWORD objnum, FX_FILESIZE& offset);
-  FX_BOOL IsObjectsAvail(CFX_PtrArray& obj_array,
-                         FX_BOOL bParsePage,
-                         IFX_DownloadHints* pHints,
-                         CFX_PtrArray& ret_array);
-  FX_BOOL CheckDocStatus(IFX_DownloadHints* pHints);
-  FX_BOOL CheckHeader(IFX_DownloadHints* pHints);
-  FX_BOOL CheckFirstPage(IFX_DownloadHints* pHints);
-  FX_BOOL CheckEnd(IFX_DownloadHints* pHints);
-  FX_BOOL CheckCrossRef(IFX_DownloadHints* pHints);
-  FX_BOOL CheckCrossRefItem(IFX_DownloadHints* pHints);
-  FX_BOOL CheckTrailer(IFX_DownloadHints* pHints);
-  FX_BOOL CheckRoot(IFX_DownloadHints* pHints);
-  FX_BOOL CheckInfo(IFX_DownloadHints* pHints);
-  FX_BOOL CheckPages(IFX_DownloadHints* pHints);
-  FX_BOOL CheckPage(IFX_DownloadHints* pHints);
-  FX_BOOL CheckResources(IFX_DownloadHints* pHints);
-  FX_BOOL CheckAnnots(IFX_DownloadHints* pHints);
-  FX_BOOL CheckAcroForm(IFX_DownloadHints* pHints);
-  FX_BOOL CheckAcroFormSubObject(IFX_DownloadHints* pHints);
-  FX_BOOL CheckTrailerAppend(IFX_DownloadHints* pHints);
-  FX_BOOL CheckPageStatus(IFX_DownloadHints* pHints);
-  FX_BOOL CheckAllCrossRefStream(IFX_DownloadHints* pHints);
-
-  int32_t CheckCrossRefStream(IFX_DownloadHints* pHints,
-                              FX_FILESIZE& xref_offset);
-  FX_BOOL IsLinearizedFile(uint8_t* pData, FX_DWORD dwLen);
-  void SetStartOffset(FX_FILESIZE dwOffset);
-  FX_BOOL GetNextToken(CFX_ByteString& token);
-  FX_BOOL GetNextChar(uint8_t& ch);
-  CPDF_Object* ParseIndirectObjectAt(FX_FILESIZE pos, FX_DWORD objnum);
-  CPDF_Object* GetObject(FX_DWORD objnum,
-                         IFX_DownloadHints* pHints,
-                         FX_BOOL* pExistInFile);
-  FX_BOOL GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages);
-  FX_BOOL PreparePageItem();
-  FX_BOOL LoadPages(IFX_DownloadHints* pHints);
-  FX_BOOL LoadAllXref(IFX_DownloadHints* pHints);
-  FX_BOOL LoadAllFile(IFX_DownloadHints* pHints);
-  FX_BOOL CheckLinearizedData(IFX_DownloadHints* pHints);
-  FX_BOOL CheckFileResources(IFX_DownloadHints* pHints);
-  FX_BOOL CheckPageAnnots(int iPage, IFX_DownloadHints* pHints);
-
-  FX_BOOL CheckLinearizedFirstPage(int iPage, IFX_DownloadHints* pHints);
-  FX_BOOL HaveResourceAncestor(CPDF_Dictionary* pDict);
-  FX_BOOL CheckPage(int32_t iPage, IFX_DownloadHints* pHints);
-  FX_BOOL LoadDocPages(IFX_DownloadHints* pHints);
-  FX_BOOL LoadDocPage(int32_t iPage, IFX_DownloadHints* pHints);
-  FX_BOOL CheckPageNode(CPDF_PageNode& pageNodes,
-                        int32_t iPage,
-                        int32_t& iCount,
-                        IFX_DownloadHints* pHints);
-  FX_BOOL CheckUnkownPageNode(FX_DWORD dwPageNo,
-                              CPDF_PageNode* pPageNode,
-                              IFX_DownloadHints* pHints);
-  FX_BOOL CheckArrayPageNode(FX_DWORD dwPageNo,
-                             CPDF_PageNode* pPageNode,
-                             IFX_DownloadHints* pHints);
-  FX_BOOL CheckPageCount(IFX_DownloadHints* pHints);
-  FX_BOOL IsFirstCheck(int iPage);
-  void ResetFirstCheck(int iPage);
-
-  CPDF_Parser m_parser;
-
-  CPDF_SyntaxParser m_syntaxParser;
-
-  CPDF_Object* m_pRoot;
-
-  FX_DWORD m_dwRootObjNum;
-
-  FX_DWORD m_dwInfoObjNum;
-
-  CPDF_Object* m_pLinearized;
-
-  CPDF_Object* m_pTrailer;
-
-  FX_BOOL m_bDocAvail;
-
-  FX_FILESIZE m_dwHeaderOffset;
-
-  FX_FILESIZE m_dwLastXRefOffset;
-
-  FX_FILESIZE m_dwXRefOffset;
-
-  FX_FILESIZE m_dwTrailerOffset;
-
-  FX_FILESIZE m_dwCurrentOffset;
-
-  PDF_DATAAVAIL_STATUS m_docStatus;
-
-  FX_FILESIZE m_dwFileLen;
-
-  CPDF_Document* m_pDocument;
-
-  CPDF_SortObjNumArray m_objnum_array;
-
-  CFX_PtrArray m_objs_array;
-
-  FX_FILESIZE m_Pos;
-
-  FX_FILESIZE m_bufferOffset;
-
-  FX_DWORD m_bufferSize;
-
-  CFX_ByteString m_WordBuf;
-
-  uint8_t m_WordBuffer[257];
-
-  FX_DWORD m_WordSize;
-
-  uint8_t m_bufferData[512];
-
-  CFX_FileSizeArray m_CrossOffset;
-
-  CFX_DWordArray m_XRefStreamList;
-
-  CFX_DWordArray m_PageObjList;
-
-  FX_DWORD m_PagesObjNum;
-
-  FX_BOOL m_bLinearized;
-
-  FX_DWORD m_dwFirstPageNo;
-
-  FX_BOOL m_bLinearedDataOK;
-
-  FX_BOOL m_bMainXRefLoadTried;
-
-  FX_BOOL m_bMainXRefLoadedOK;
-
-  FX_BOOL m_bPagesTreeLoad;
-
-  FX_BOOL m_bPagesLoad;
-
-  CPDF_Parser* m_pCurrentParser;
-
-  FX_FILESIZE m_dwCurrentXRefSteam;
-
-  FX_BOOL m_bAnnotsLoad;
-
-  FX_BOOL m_bHaveAcroForm;
-
-  FX_DWORD m_dwAcroFormObjNum;
-
-  FX_BOOL m_bAcroFormLoad;
-
-  CPDF_Object* m_pAcroForm;
-
-  CFX_PtrArray m_arrayAcroforms;
-
-  CPDF_Dictionary* m_pPageDict;
-
-  CPDF_Object* m_pPageResource;
-
-  FX_BOOL m_bNeedDownLoadResource;
-
-  FX_BOOL m_bPageLoadedOK;
-
-  FX_BOOL m_bLinearizedFormParamLoad;
-
-  CFX_PtrArray m_PagesArray;
-
-  FX_DWORD m_dwEncryptObjNum;
-
-  FX_FILESIZE m_dwPrevXRefOffset;
-
-  FX_BOOL m_bTotalLoadPageTree;
-
-  FX_BOOL m_bCurPageDictLoadOK;
-
-  CPDF_PageNode m_pageNodes;
-
-  std::set<FX_DWORD> m_pageMapCheckState;
-  std::set<FX_DWORD> m_pagesLoadState;
-};
-
-IPDF_DataAvail::IPDF_DataAvail(IFX_FileAvail* pFileAvail,
-                               IFX_FileRead* pFileRead)
-    : m_pFileAvail(pFileAvail), m_pFileRead(pFileRead) {}
-
-// static
-IPDF_DataAvail* IPDF_DataAvail::Create(IFX_FileAvail* pFileAvail,
-                                       IFX_FileRead* pFileRead) {
-  return new CPDF_DataAvail(pFileAvail, pFileRead);
-}
-
-// static
-int CPDF_DataAvail::s_CurrentDataAvailRecursionDepth = 0;
-
-CPDF_DataAvail::CPDF_DataAvail(IFX_FileAvail* pFileAvail,
-                               IFX_FileRead* pFileRead)
-    : IPDF_DataAvail(pFileAvail, pFileRead) {
-  m_Pos = 0;
-  m_dwFileLen = 0;
-  if (m_pFileRead) {
-    m_dwFileLen = (FX_DWORD)m_pFileRead->GetSize();
-  }
-  m_dwCurrentOffset = 0;
-  m_WordSize = 0;
-  m_dwXRefOffset = 0;
-  m_bufferOffset = 0;
-  m_dwFirstPageNo = 0;
-  m_bufferSize = 0;
-  m_PagesObjNum = 0;
-  m_dwCurrentXRefSteam = 0;
-  m_dwAcroFormObjNum = 0;
-  m_dwInfoObjNum = 0;
-  m_pDocument = 0;
-  m_dwEncryptObjNum = 0;
-  m_dwPrevXRefOffset = 0;
-  m_dwLastXRefOffset = 0;
-  m_bDocAvail = FALSE;
-  m_bMainXRefLoadTried = FALSE;
-  m_bDocAvail = FALSE;
-  m_bLinearized = FALSE;
-  m_bPagesLoad = FALSE;
-  m_bPagesTreeLoad = FALSE;
-  m_bMainXRefLoadedOK = FALSE;
-  m_bAnnotsLoad = FALSE;
-  m_bHaveAcroForm = FALSE;
-  m_bAcroFormLoad = FALSE;
-  m_bPageLoadedOK = FALSE;
-  m_bNeedDownLoadResource = FALSE;
-  m_bLinearizedFormParamLoad = FALSE;
-  m_pLinearized = NULL;
-  m_pRoot = NULL;
-  m_pTrailer = NULL;
-  m_pCurrentParser = NULL;
-  m_pAcroForm = NULL;
-  m_pPageDict = NULL;
-  m_pPageResource = NULL;
-  m_docStatus = PDF_DATAAVAIL_HEADER;
-  m_parser.m_bOwnFileRead = FALSE;
-  m_bTotalLoadPageTree = FALSE;
-  m_bCurPageDictLoadOK = FALSE;
-  m_bLinearedDataOK = FALSE;
-}
-CPDF_DataAvail::~CPDF_DataAvail() {
-  if (m_pLinearized) {
-    m_pLinearized->Release();
-  }
-  if (m_pRoot) {
-    m_pRoot->Release();
-  }
-  if (m_pTrailer) {
-    m_pTrailer->Release();
-  }
-  int32_t i = 0;
-  int32_t iSize = m_arrayAcroforms.GetSize();
-  for (i = 0; i < iSize; ++i) {
-    ((CPDF_Object*)m_arrayAcroforms.GetAt(i))->Release();
-  }
-}
-void CPDF_DataAvail::SetDocument(CPDF_Document* pDoc) {
-  m_pDocument = pDoc;
-}
-FX_DWORD CPDF_DataAvail::GetObjectSize(FX_DWORD objnum, FX_FILESIZE& offset) {
-  CPDF_Parser* pParser = (CPDF_Parser*)(m_pDocument->GetParser());
-  if (pParser == NULL) {
-    return 0;
-  }
-  if (objnum >= (FX_DWORD)pParser->m_CrossRef.GetSize()) {
-    return 0;
-  }
-  if (pParser->m_V5Type[objnum] == 2) {
-    objnum = (FX_DWORD)pParser->m_CrossRef[objnum];
-  }
-  if (pParser->m_V5Type[objnum] == 1 || pParser->m_V5Type[objnum] == 255) {
-    offset = pParser->m_CrossRef[objnum];
-    if (offset == 0) {
-      return 0;
-    }
-    void* pResult = FXSYS_bsearch(&offset, pParser->m_SortedOffset.GetData(),
-                                  pParser->m_SortedOffset.GetSize(),
-                                  sizeof(FX_FILESIZE), _CompareFileSize);
-    if (pResult == NULL) {
-      return 0;
-    }
-    if ((FX_FILESIZE*)pResult -
-            (FX_FILESIZE*)pParser->m_SortedOffset.GetData() ==
-        pParser->m_SortedOffset.GetSize() - 1) {
-      return 0;
-    }
-    return (FX_DWORD)(((FX_FILESIZE*)pResult)[1] - offset);
-  }
-  return 0;
-}
-FX_BOOL CPDF_DataAvail::IsObjectsAvail(CFX_PtrArray& obj_array,
-                                       FX_BOOL bParsePage,
-                                       IFX_DownloadHints* pHints,
-                                       CFX_PtrArray& ret_array) {
-  if (!obj_array.GetSize()) {
-    return TRUE;
-  }
-  FX_DWORD count = 0;
-  CFX_PtrArray new_obj_array;
-  int32_t i = 0;
-  for (i = 0; i < obj_array.GetSize(); i++) {
-    CPDF_Object* pObj = (CPDF_Object*)obj_array[i];
-    if (!pObj) {
-      continue;
-    }
-    int32_t type = pObj->GetType();
-    switch (type) {
-      case PDFOBJ_ARRAY: {
-        CPDF_Array* pArray = pObj->GetArray();
-        for (FX_DWORD k = 0; k < pArray->GetCount(); k++) {
-          new_obj_array.Add(pArray->GetElement(k));
-        }
-      } break;
-      case PDFOBJ_STREAM:
-        pObj = pObj->GetDict();
-      case PDFOBJ_DICTIONARY: {
-        CPDF_Dictionary* pDict = pObj->GetDict();
-        if (pDict && pDict->GetString("Type") == "Page" && !bParsePage) {
-          continue;
-        }
-        FX_POSITION pos = pDict->GetStartPos();
-        while (pos) {
-          CPDF_Object* value;
-          CFX_ByteString key;
-          value = pDict->GetNextElement(pos, key);
-          if (key != "Parent") {
-            new_obj_array.Add(value);
-          }
-        }
-      } break;
-      case PDFOBJ_REFERENCE: {
-        CPDF_Reference* pRef = (CPDF_Reference*)pObj;
-        FX_DWORD dwNum = pRef->GetRefObjNum();
-        FX_FILESIZE offset;
-        FX_DWORD original_size = GetObjectSize(dwNum, offset);
-        pdfium::base::CheckedNumeric<FX_DWORD> size = original_size;
-        if (size.ValueOrDefault(0) == 0 || offset < 0 ||
-            offset >= m_dwFileLen) {
-          break;
-        }
-
-        size += offset;
-        size += 512;
-        if (!size.IsValid()) {
-          break;
-        }
-        if (size.ValueOrDie() > m_dwFileLen) {
-          size = m_dwFileLen - offset;
-        } else {
-          size = original_size + 512;
-        }
-        if (!size.IsValid()) {
-          break;
-        }
-        if (!m_pFileAvail->IsDataAvail(offset, size.ValueOrDie())) {
-          pHints->AddSegment(offset, size.ValueOrDie());
-          ret_array.Add(pObj);
-          count++;
-        } else if (!m_objnum_array.Find(dwNum)) {
-          m_objnum_array.AddObjNum(dwNum);
-          CPDF_Object* pReferred =
-              m_pDocument->GetIndirectObject(pRef->GetRefObjNum(), NULL);
-          if (pReferred) {
-            new_obj_array.Add(pReferred);
-          }
-        }
-      } break;
-    }
-  }
-  if (count > 0) {
-    int32_t iSize = new_obj_array.GetSize();
-    for (i = 0; i < iSize; ++i) {
-      CPDF_Object* pObj = (CPDF_Object*)new_obj_array[i];
-      int32_t type = pObj->GetType();
-      if (type == PDFOBJ_REFERENCE) {
-        CPDF_Reference* pRef = (CPDF_Reference*)pObj;
-        FX_DWORD dwNum = pRef->GetRefObjNum();
-        if (!m_objnum_array.Find(dwNum)) {
-          ret_array.Add(pObj);
-        }
-      } else {
-        ret_array.Add(pObj);
-      }
-    }
-    return FALSE;
-  }
-  obj_array.RemoveAll();
-  obj_array.Append(new_obj_array);
-  return IsObjectsAvail(obj_array, FALSE, pHints, ret_array);
-}
-FX_BOOL CPDF_DataAvail::IsDocAvail(IFX_DownloadHints* pHints) {
-  if (!m_dwFileLen && m_pFileRead) {
-    m_dwFileLen = (FX_DWORD)m_pFileRead->GetSize();
-    if (!m_dwFileLen) {
-      return TRUE;
-    }
-  }
-  while (!m_bDocAvail) {
-    if (!CheckDocStatus(pHints)) {
-      return FALSE;
-    }
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckAcroFormSubObject(IFX_DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    m_objnum_array.RemoveAll();
-    CFX_PtrArray obj_array;
-    obj_array.Append(m_arrayAcroforms);
-    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
-    if (bRet) {
-      m_objs_array.RemoveAll();
-    }
-    return bRet;
-  }
-  CFX_PtrArray new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  if (bRet) {
-    int32_t iSize = m_arrayAcroforms.GetSize();
-    for (int32_t i = 0; i < iSize; ++i) {
-      ((CPDF_Object*)m_arrayAcroforms.GetAt(i))->Release();
-    }
-    m_arrayAcroforms.RemoveAll();
-  } else {
-    m_objs_array.RemoveAll();
-    m_objs_array.Append(new_objs_array);
-  }
-  return bRet;
-}
-FX_BOOL CPDF_DataAvail::CheckAcroForm(IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  m_pAcroForm = GetObject(m_dwAcroFormObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_PAGETREE;
-    return TRUE;
-  }
-  if (!m_pAcroForm) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-  m_arrayAcroforms.Add(m_pAcroForm);
-  m_docStatus = PDF_DATAAVAIL_PAGETREE;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckDocStatus(IFX_DownloadHints* pHints) {
-  switch (m_docStatus) {
-    case PDF_DATAAVAIL_HEADER:
-      return CheckHeader(pHints);
-    case PDF_DATAAVAIL_FIRSTPAGE:
-    case PDF_DATAAVAIL_FIRSTPAGE_PREPARE:
-      return CheckFirstPage(pHints);
-    case PDF_DATAAVAIL_END:
-      return CheckEnd(pHints);
-    case PDF_DATAAVAIL_CROSSREF:
-      return CheckCrossRef(pHints);
-    case PDF_DATAAVAIL_CROSSREF_ITEM:
-      return CheckCrossRefItem(pHints);
-    case PDF_DATAAVAIL_CROSSREF_STREAM:
-      return CheckAllCrossRefStream(pHints);
-    case PDF_DATAAVAIL_TRAILER:
-      return CheckTrailer(pHints);
-    case PDF_DATAAVAIL_TRAILER_APPEND:
-      return CheckTrailerAppend(pHints);
-    case PDF_DATAAVAIL_LOADALLCRSOSSREF:
-      return LoadAllXref(pHints);
-    case PDF_DATAAVAIL_LOADALLFILE:
-      return LoadAllFile(pHints);
-    case PDF_DATAAVAIL_ROOT:
-      return CheckRoot(pHints);
-    case PDF_DATAAVAIL_INFO:
-      return CheckInfo(pHints);
-    case PDF_DATAAVAIL_ACROFORM:
-      return CheckAcroForm(pHints);
-    case PDF_DATAAVAIL_PAGETREE:
-      if (m_bTotalLoadPageTree) {
-        return CheckPages(pHints);
-      }
-      return LoadDocPages(pHints);
-    case PDF_DATAAVAIL_PAGE:
-      if (m_bTotalLoadPageTree) {
-        return CheckPage(pHints);
-      }
-      m_docStatus = PDF_DATAAVAIL_PAGE_LATERLOAD;
-      return TRUE;
-    case PDF_DATAAVAIL_ERROR:
-      return LoadAllFile(pHints);
-    case PDF_DATAAVAIL_PAGE_LATERLOAD:
-      m_docStatus = PDF_DATAAVAIL_PAGE;
-    default:
-      m_bDocAvail = TRUE;
-      return TRUE;
-  }
-}
-FX_BOOL CPDF_DataAvail::CheckPageStatus(IFX_DownloadHints* pHints) {
-  switch (m_docStatus) {
-    case PDF_DATAAVAIL_PAGETREE:
-      return CheckPages(pHints);
-    case PDF_DATAAVAIL_PAGE:
-      return CheckPage(pHints);
-    case PDF_DATAAVAIL_ERROR:
-      return LoadAllFile(pHints);
-    default:
-      m_bPagesTreeLoad = TRUE;
-      m_bPagesLoad = TRUE;
-      return TRUE;
-  }
-}
-FX_BOOL CPDF_DataAvail::LoadAllFile(IFX_DownloadHints* pHints) {
-  if (m_pFileAvail->IsDataAvail(0, (FX_DWORD)m_dwFileLen)) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-  pHints->AddSegment(0, (FX_DWORD)m_dwFileLen);
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::LoadAllXref(IFX_DownloadHints* pHints) {
-  m_parser.m_Syntax.InitParser(m_pFileRead, (FX_DWORD)m_dwHeaderOffset);
-  m_parser.m_bOwnFileRead = FALSE;
-  if (!m_parser.LoadAllCrossRefV4(m_dwLastXRefOffset) &&
-      !m_parser.LoadAllCrossRefV5(m_dwLastXRefOffset)) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return FALSE;
-  }
-  FXSYS_qsort(m_parser.m_SortedOffset.GetData(),
-              m_parser.m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
-              _CompareFileSize);
-  m_dwRootObjNum = m_parser.GetRootObjNum();
-  m_dwInfoObjNum = m_parser.GetInfoObjNum();
-  m_pCurrentParser = &m_parser;
-  m_docStatus = PDF_DATAAVAIL_ROOT;
-  return TRUE;
-}
-CPDF_Object* CPDF_DataAvail::GetObject(FX_DWORD objnum,
-                                       IFX_DownloadHints* pHints,
-                                       FX_BOOL* pExistInFile) {
-  CPDF_Object* pRet = NULL;
-  FX_DWORD original_size = 0;
-  FX_FILESIZE offset = 0;
-  CPDF_Parser* pParser = NULL;
-
-  if (pExistInFile) {
-    *pExistInFile = TRUE;
-  }
-
-  if (m_pDocument == NULL) {
-    original_size = (FX_DWORD)m_parser.GetObjectSize(objnum);
-    offset = m_parser.GetObjectOffset(objnum);
-    pParser = &m_parser;
-  } else {
-    original_size = GetObjectSize(objnum, offset);
-    pParser = (CPDF_Parser*)(m_pDocument->GetParser());
-  }
-
-  pdfium::base::CheckedNumeric<FX_DWORD> size = original_size;
-  if (size.ValueOrDefault(0) == 0 || offset < 0 || offset >= m_dwFileLen) {
-    if (pExistInFile)
-      *pExistInFile = FALSE;
-
-    return NULL;
-  }
-
-  size += offset;
-  size += 512;
-  if (!size.IsValid()) {
-    return NULL;
-  }
-
-  if (size.ValueOrDie() > m_dwFileLen) {
-    size = m_dwFileLen - offset;
-  } else {
-    size = original_size + 512;
-  }
-
-  if (!size.IsValid()) {
-    return NULL;
-  }
-
-  if (!m_pFileAvail->IsDataAvail(offset, size.ValueOrDie())) {
-    pHints->AddSegment(offset, size.ValueOrDie());
-    return NULL;
-  }
-
-  if (pParser) {
-    pRet = pParser->ParseIndirectObject(NULL, objnum, NULL);
-  }
-
-  if (!pRet && pExistInFile) {
-    *pExistInFile = FALSE;
-  }
-
-  return pRet;
-}
-
-FX_BOOL CPDF_DataAvail::CheckInfo(IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pInfo = GetObject(m_dwInfoObjNum, pHints, &bExist);
-  if (!bExist) {
-    if (m_bHaveAcroForm) {
-      m_docStatus = PDF_DATAAVAIL_ACROFORM;
-    } else {
-      m_docStatus = PDF_DATAAVAIL_PAGETREE;
-    }
-    return TRUE;
-  }
-  if (!pInfo) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    if (m_Pos == m_dwFileLen) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-    }
-    return FALSE;
-  }
-  if (pInfo) {
-    pInfo->Release();
-  }
-  if (m_bHaveAcroForm) {
-    m_docStatus = PDF_DATAAVAIL_ACROFORM;
-  } else {
-    m_docStatus = PDF_DATAAVAIL_PAGETREE;
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckRoot(IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  m_pRoot = GetObject(m_dwRootObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-  if (!m_pRoot) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-  CPDF_Dictionary* pDict = m_pRoot->GetDict();
-  if (!pDict) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  CPDF_Reference* pRef = (CPDF_Reference*)pDict->GetElement(FX_BSTRC("Pages"));
-  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  m_PagesObjNum = pRef->GetRefObjNum();
-  CPDF_Reference* pAcroFormRef =
-      (CPDF_Reference*)m_pRoot->GetDict()->GetElement(FX_BSTRC("AcroForm"));
-  if (pAcroFormRef && pAcroFormRef->GetType() == PDFOBJ_REFERENCE) {
-    m_bHaveAcroForm = TRUE;
-    m_dwAcroFormObjNum = pAcroFormRef->GetRefObjNum();
-  }
-  if (m_dwInfoObjNum) {
-    m_docStatus = PDF_DATAAVAIL_INFO;
-  } else {
-    if (m_bHaveAcroForm) {
-      m_docStatus = PDF_DATAAVAIL_ACROFORM;
-    } else {
-      m_docStatus = PDF_DATAAVAIL_PAGETREE;
-    }
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::PreparePageItem() {
-  CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
-  CPDF_Reference* pRef =
-      pRoot ? (CPDF_Reference*)pRoot->GetElement(FX_BSTRC("Pages")) : NULL;
-  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  m_PagesObjNum = pRef->GetRefObjNum();
-  m_pCurrentParser = (CPDF_Parser*)m_pDocument->GetParser();
-  m_docStatus = PDF_DATAAVAIL_PAGETREE;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::IsFirstCheck(int iPage) {
-  if (m_pageMapCheckState.find(iPage) != m_pageMapCheckState.end())
-    return FALSE;
-
-  m_pageMapCheckState.insert(iPage);
-  return TRUE;
-}
-void CPDF_DataAvail::ResetFirstCheck(int iPage) {
-  m_pageMapCheckState.erase(iPage);
-}
-FX_BOOL CPDF_DataAvail::CheckPage(IFX_DownloadHints* pHints) {
-  FX_DWORD iPageObjs = m_PageObjList.GetSize();
-  CFX_DWordArray UnavailObjList;
-  for (FX_DWORD i = 0; i < iPageObjs; ++i) {
-    FX_DWORD dwPageObjNum = m_PageObjList.GetAt(i);
-    FX_BOOL bExist = FALSE;
-    CPDF_Object* pObj = GetObject(dwPageObjNum, pHints, &bExist);
-    if (!pObj) {
-      if (bExist) {
-        UnavailObjList.Add(dwPageObjNum);
-      }
-      continue;
-    }
-    if (pObj->GetType() == PDFOBJ_ARRAY) {
-      CPDF_Array* pArray = pObj->GetArray();
-      if (pArray) {
-        int32_t iSize = pArray->GetCount();
-        CPDF_Object* pItem = NULL;
-        for (int32_t j = 0; j < iSize; ++j) {
-          pItem = pArray->GetElement(j);
-          if (pItem && pItem->GetType() == PDFOBJ_REFERENCE) {
-            UnavailObjList.Add(((CPDF_Reference*)pItem)->GetRefObjNum());
-          }
-        }
-      }
-    }
-    if (pObj->GetType() != PDFOBJ_DICTIONARY) {
-      pObj->Release();
-      continue;
-    }
-    CFX_ByteString type = pObj->GetDict()->GetString(FX_BSTRC("Type"));
-    if (type == FX_BSTRC("Pages")) {
-      m_PagesArray.Add(pObj);
-      continue;
-    }
-    pObj->Release();
-  }
-  m_PageObjList.RemoveAll();
-  if (UnavailObjList.GetSize()) {
-    m_PageObjList.Append(UnavailObjList);
-    return FALSE;
-  }
-  FX_DWORD iPages = m_PagesArray.GetSize();
-  for (FX_DWORD i = 0; i < iPages; i++) {
-    CPDF_Object* pPages = (CPDF_Object*)m_PagesArray.GetAt(i);
-    if (!pPages) {
-      continue;
-    }
-    if (!GetPageKids(m_pCurrentParser, pPages)) {
-      pPages->Release();
-      while (++i < iPages) {
-        pPages = (CPDF_Object*)m_PagesArray.GetAt(i);
-        pPages->Release();
-      }
-      m_PagesArray.RemoveAll();
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    pPages->Release();
-  }
-  m_PagesArray.RemoveAll();
-  if (!m_PageObjList.GetSize()) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages) {
-  if (!pParser) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  CPDF_Dictionary* pDict = pPages->GetDict();
-  CPDF_Object* pKids = pDict ? pDict->GetElement(FX_BSTRC("Kids")) : NULL;
-  if (!pKids) {
-    return TRUE;
-  }
-  switch (pKids->GetType()) {
-    case PDFOBJ_REFERENCE: {
-      CPDF_Reference* pKid = (CPDF_Reference*)pKids;
-      m_PageObjList.Add(pKid->GetRefObjNum());
-    } break;
-    case PDFOBJ_ARRAY: {
-      CPDF_Array* pKidsArray = (CPDF_Array*)pKids;
-      for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
-        CPDF_Object* pKid = (CPDF_Object*)pKidsArray->GetElement(i);
-        if (pKid && pKid->GetType() == PDFOBJ_REFERENCE) {
-          m_PageObjList.Add(((CPDF_Reference*)pKid)->GetRefObjNum());
-        }
-      }
-    } break;
-    default:
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckPages(IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-  if (!pPages) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      return TRUE;
-    }
-    return FALSE;
-  }
-  if (!GetPageKids(m_pCurrentParser, pPages)) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  pPages->Release();
-  m_docStatus = PDF_DATAAVAIL_PAGE;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckHeader(IFX_DownloadHints* pHints) {
-  FX_DWORD req_size = 1024;
-  if ((FX_FILESIZE)req_size > m_dwFileLen) {
-    req_size = (FX_DWORD)m_dwFileLen;
-  }
-  if (m_pFileAvail->IsDataAvail(0, req_size)) {
-    uint8_t buffer[1024];
-    m_pFileRead->ReadBlock(buffer, 0, req_size);
-    if (IsLinearizedFile(buffer, req_size)) {
-      m_docStatus = PDF_DATAAVAIL_FIRSTPAGE;
-    } else {
-      if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-        return FALSE;
-      }
-      m_docStatus = PDF_DATAAVAIL_END;
-    }
-    return TRUE;
-  }
-  pHints->AddSegment(0, req_size);
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::CheckFirstPage(IFX_DownloadHints* pHints) {
-  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
-  CPDF_Object* pEndOffSet = pDict ? pDict->GetElement(FX_BSTRC("E")) : NULL;
-  if (!pEndOffSet) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  CPDF_Object* pXRefOffset = pDict ? pDict->GetElement(FX_BSTRC("T")) : NULL;
-  if (!pXRefOffset) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  CPDF_Object* pFileLen = pDict ? pDict->GetElement(FX_BSTRC("L")) : NULL;
-  if (!pFileLen) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  FX_BOOL bNeedDownLoad = FALSE;
-  if (pEndOffSet->GetType() == PDFOBJ_NUMBER) {
-    FX_DWORD dwEnd = pEndOffSet->GetInteger();
-    dwEnd += 512;
-    if ((FX_FILESIZE)dwEnd > m_dwFileLen) {
-      dwEnd = (FX_DWORD)m_dwFileLen;
-    }
-    int32_t iStartPos = (int32_t)(m_dwFileLen > 1024 ? 1024 : m_dwFileLen);
-    int32_t iSize = dwEnd > 1024 ? dwEnd - 1024 : 0;
-    if (!m_pFileAvail->IsDataAvail(iStartPos, iSize)) {
-      pHints->AddSegment(iStartPos, iSize);
-      bNeedDownLoad = TRUE;
-    }
-  }
-  m_dwLastXRefOffset = 0;
-  FX_FILESIZE dwFileLen = 0;
-  if (pXRefOffset->GetType() == PDFOBJ_NUMBER) {
-    m_dwLastXRefOffset = pXRefOffset->GetInteger();
-  }
-  if (pFileLen->GetType() == PDFOBJ_NUMBER) {
-    dwFileLen = pFileLen->GetInteger();
-  }
-  if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
-                                 (FX_DWORD)(dwFileLen - m_dwLastXRefOffset))) {
-    if (m_docStatus == PDF_DATAAVAIL_FIRSTPAGE) {
-      FX_DWORD dwSize = (FX_DWORD)(dwFileLen - m_dwLastXRefOffset);
-      FX_FILESIZE offset = m_dwLastXRefOffset;
-      if (dwSize < 512 && dwFileLen > 512) {
-        dwSize = 512;
-        offset = dwFileLen - 512;
-      }
-      pHints->AddSegment(offset, dwSize);
-    }
-  } else {
-    m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
-  }
-  if (!bNeedDownLoad && m_docStatus == PDF_DATAAVAIL_FIRSTPAGE_PREPARE) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-  m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
-  return FALSE;
-}
-CPDF_Object* CPDF_DataAvail::ParseIndirectObjectAt(FX_FILESIZE pos,
-                                                   FX_DWORD objnum) {
-  FX_FILESIZE SavedPos = m_syntaxParser.SavePos();
-  m_syntaxParser.RestorePos(pos);
-  FX_BOOL bIsNumber;
-  CFX_ByteString word = m_syntaxParser.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    return NULL;
-  }
-  FX_DWORD parser_objnum = FXSYS_atoi(word);
-  if (objnum && parser_objnum != objnum) {
-    return NULL;
-  }
-  word = m_syntaxParser.GetNextWord(bIsNumber);
-  if (!bIsNumber) {
-    return NULL;
-  }
-  FX_DWORD gennum = FXSYS_atoi(word);
-  if (m_syntaxParser.GetKeyword() != FX_BSTRC("obj")) {
-    m_syntaxParser.RestorePos(SavedPos);
-    return NULL;
-  }
-  CPDF_Object* pObj = m_syntaxParser.GetObject(NULL, objnum, gennum, 0);
-  m_syntaxParser.RestorePos(SavedPos);
-  return pObj;
-}
-int32_t CPDF_DataAvail::IsLinearizedPDF() {
-  FX_DWORD req_size = 1024;
-  if (!m_pFileAvail->IsDataAvail(0, req_size)) {
-    return PDF_UNKNOW_LINEARIZED;
-  }
-  if (!m_pFileRead) {
-    return PDF_NOT_LINEARIZED;
-  }
-  FX_FILESIZE dwSize = m_pFileRead->GetSize();
-  if (dwSize < (FX_FILESIZE)req_size) {
-    return PDF_UNKNOW_LINEARIZED;
-  }
-  uint8_t buffer[1024];
-  m_pFileRead->ReadBlock(buffer, 0, req_size);
-  if (IsLinearizedFile(buffer, req_size)) {
-    return PDF_IS_LINEARIZED;
-  }
-  return PDF_NOT_LINEARIZED;
-}
-FX_BOOL CPDF_DataAvail::IsLinearizedFile(uint8_t* pData, FX_DWORD dwLen) {
-  CFX_SmartPointer<IFX_FileStream> file(
-      FX_CreateMemoryStream(pData, (size_t)dwLen, FALSE));
-  int32_t offset = GetHeaderOffset(file.Get());
-  if (offset == -1) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  m_dwHeaderOffset = offset;
-  m_syntaxParser.InitParser(file.Get(), offset);
-  m_syntaxParser.RestorePos(m_syntaxParser.m_HeaderOffset + 9);
-  FX_BOOL bNumber = FALSE;
-  CFX_ByteString wordObjNum = m_syntaxParser.GetNextWord(bNumber);
-  if (!bNumber) {
-    return FALSE;
-  }
-  FX_DWORD objnum = FXSYS_atoi(wordObjNum);
-  if (m_pLinearized) {
-    m_pLinearized->Release();
-    m_pLinearized = NULL;
-  }
-  m_pLinearized =
-      ParseIndirectObjectAt(m_syntaxParser.m_HeaderOffset + 9, objnum);
-  if (!m_pLinearized) {
-    return FALSE;
-  }
-  if (m_pLinearized->GetDict() &&
-      m_pLinearized->GetDict()->GetElement(FX_BSTRC("Linearized"))) {
-    CPDF_Object* pLen = m_pLinearized->GetDict()->GetElement(FX_BSTRC("L"));
-    if (!pLen) {
-      return FALSE;
-    }
-    if ((FX_FILESIZE)pLen->GetInteger() != m_pFileRead->GetSize()) {
-      return FALSE;
-    }
-    m_bLinearized = TRUE;
-    CPDF_Object* pNo = m_pLinearized->GetDict()->GetElement(FX_BSTRC("P"));
-    if (pNo && pNo->GetType() == PDFOBJ_NUMBER) {
-      m_dwFirstPageNo = pNo->GetInteger();
-    }
-    return TRUE;
-  }
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::CheckEnd(IFX_DownloadHints* pHints) {
-  FX_DWORD req_pos = (FX_DWORD)(m_dwFileLen > 1024 ? m_dwFileLen - 1024 : 0);
-  FX_DWORD dwSize = (FX_DWORD)(m_dwFileLen - req_pos);
-  if (m_pFileAvail->IsDataAvail(req_pos, dwSize)) {
-    uint8_t buffer[1024];
-    m_pFileRead->ReadBlock(buffer, req_pos, dwSize);
-    CFX_SmartPointer<IFX_FileStream> file(
-        FX_CreateMemoryStream(buffer, (size_t)dwSize, FALSE));
-    m_syntaxParser.InitParser(file.Get(), 0);
-    m_syntaxParser.RestorePos(dwSize - 1);
-    if (m_syntaxParser.SearchWord(FX_BSTRC("startxref"), TRUE, FALSE, dwSize)) {
-      FX_BOOL bNumber;
-      m_syntaxParser.GetNextWord(bNumber);
-      CFX_ByteString xrefpos_str = m_syntaxParser.GetNextWord(bNumber);
-      if (!bNumber) {
-        m_docStatus = PDF_DATAAVAIL_ERROR;
-        return FALSE;
-      }
-      m_dwXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str);
-      if (!m_dwXRefOffset || m_dwXRefOffset > m_dwFileLen) {
-        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-        return TRUE;
-      }
-      m_dwLastXRefOffset = m_dwXRefOffset;
-      SetStartOffset(m_dwXRefOffset);
-      m_docStatus = PDF_DATAAVAIL_CROSSREF;
-      return TRUE;
-    }
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-  pHints->AddSegment(req_pos, dwSize);
-  return FALSE;
-}
-int32_t CPDF_DataAvail::CheckCrossRefStream(IFX_DownloadHints* pHints,
-                                            FX_FILESIZE& xref_offset) {
-  xref_offset = 0;
-  FX_DWORD req_size =
-      (FX_DWORD)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-  if (m_pFileAvail->IsDataAvail(m_Pos, req_size)) {
-    int32_t iSize = (int32_t)(m_Pos + req_size - m_dwCurrentXRefSteam);
-    CFX_BinaryBuf buf(iSize);
-    uint8_t* pBuf = buf.GetBuffer();
-    m_pFileRead->ReadBlock(pBuf, m_dwCurrentXRefSteam, iSize);
-    CFX_SmartPointer<IFX_FileStream> file(
-        FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
-    m_parser.m_Syntax.InitParser(file.Get(), 0);
-    FX_BOOL bNumber = FALSE;
-    CFX_ByteString objnum = m_parser.m_Syntax.GetNextWord(bNumber);
-    if (!bNumber) {
-      return -1;
-    }
-    FX_DWORD objNum = FXSYS_atoi(objnum);
-    CPDF_Object* pObj = m_parser.ParseIndirectObjectAt(NULL, 0, objNum, NULL);
-    if (!pObj) {
-      m_Pos += m_parser.m_Syntax.SavePos();
-      return 0;
-    }
-    CPDF_Dictionary* pDict = pObj->GetDict();
-    CPDF_Object* pName = pDict ? pDict->GetElement(FX_BSTRC("Type")) : NULL;
-    if (pName && pName->GetType() == PDFOBJ_NAME) {
-      if (pName->GetString() == FX_BSTRC("XRef")) {
-        m_Pos += m_parser.m_Syntax.SavePos();
-        xref_offset = pObj->GetDict()->GetInteger(FX_BSTRC("Prev"));
-        pObj->Release();
-        return 1;
-      }
-    }
-    pObj->Release();
-    return -1;
-  }
-  pHints->AddSegment(m_Pos, req_size);
-  return 0;
-}
-inline void CPDF_DataAvail::SetStartOffset(FX_FILESIZE dwOffset) {
-  m_Pos = dwOffset;
-}
-#define MAX_WORD_BUFFER 256
-FX_BOOL CPDF_DataAvail::GetNextToken(CFX_ByteString& token) {
-  m_WordSize = 0;
-  uint8_t ch;
-  if (!GetNextChar(ch)) {
-    return FALSE;
-  }
-  uint8_t type = PDF_CharType[ch];
-  while (1) {
-    while (type == 'W') {
-      if (!GetNextChar(ch)) {
-        return FALSE;
-      }
-      type = PDF_CharType[ch];
-    }
-    if (ch != '%') {
-      break;
-    }
-    while (1) {
-      if (!GetNextChar(ch)) {
-        return FALSE;
-      }
-      if (ch == '\r' || ch == '\n') {
-        break;
-      }
-    }
-    type = PDF_CharType[ch];
-  }
-  if (type == 'D') {
-    m_WordBuffer[m_WordSize++] = ch;
-    if (ch == '/') {
-      while (1) {
-        if (!GetNextChar(ch)) {
-          return FALSE;
-        }
-        type = PDF_CharType[ch];
-        if (type != 'R' && type != 'N') {
-          m_Pos--;
-          CFX_ByteString ret(m_WordBuffer, m_WordSize);
-          token = ret;
-          return TRUE;
-        }
-        if (m_WordSize < MAX_WORD_BUFFER) {
-          m_WordBuffer[m_WordSize++] = ch;
-        }
-      }
-    } else if (ch == '<') {
-      if (!GetNextChar(ch)) {
-        return FALSE;
-      }
-      if (ch == '<') {
-        m_WordBuffer[m_WordSize++] = ch;
-      } else {
-        m_Pos--;
-      }
-    } else if (ch == '>') {
-      if (!GetNextChar(ch)) {
-        return FALSE;
-      }
-      if (ch == '>') {
-        m_WordBuffer[m_WordSize++] = ch;
-      } else {
-        m_Pos--;
-      }
-    }
-    CFX_ByteString ret(m_WordBuffer, m_WordSize);
-    token = ret;
-    return TRUE;
-  }
-  while (1) {
-    if (m_WordSize < MAX_WORD_BUFFER) {
-      m_WordBuffer[m_WordSize++] = ch;
-    }
-    if (!GetNextChar(ch)) {
-      return FALSE;
-    }
-    type = PDF_CharType[ch];
-    if (type == 'D' || type == 'W') {
-      m_Pos--;
-      break;
-    }
-  }
-  CFX_ByteString ret(m_WordBuffer, m_WordSize);
-  token = ret;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::GetNextChar(uint8_t& ch) {
-  FX_FILESIZE pos = m_Pos;
-  if (pos >= m_dwFileLen) {
-    return FALSE;
-  }
-  if (m_bufferOffset >= pos ||
-      (FX_FILESIZE)(m_bufferOffset + m_bufferSize) <= pos) {
-    FX_FILESIZE read_pos = pos;
-    FX_DWORD read_size = 512;
-    if ((FX_FILESIZE)read_size > m_dwFileLen) {
-      read_size = (FX_DWORD)m_dwFileLen;
-    }
-    if ((FX_FILESIZE)(read_pos + read_size) > m_dwFileLen) {
-      read_pos = m_dwFileLen - read_size;
-    }
-    if (!m_pFileRead->ReadBlock(m_bufferData, read_pos, read_size)) {
-      return FALSE;
-    }
-    m_bufferOffset = read_pos;
-    m_bufferSize = read_size;
-  }
-  ch = m_bufferData[pos - m_bufferOffset];
-  m_Pos++;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckCrossRefItem(IFX_DownloadHints* pHints) {
-  int32_t iSize = 0;
-  CFX_ByteString token;
-  while (1) {
-    if (!GetNextToken(token)) {
-      iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-      pHints->AddSegment(m_Pos, iSize);
-      return FALSE;
-    }
-    if (token == "trailer") {
-      m_dwTrailerOffset = m_Pos;
-      m_docStatus = PDF_DATAAVAIL_TRAILER;
-      return TRUE;
-    }
-  }
-}
-FX_BOOL CPDF_DataAvail::CheckAllCrossRefStream(IFX_DownloadHints* pHints) {
-  FX_FILESIZE xref_offset = 0;
-  int32_t nRet = CheckCrossRefStream(pHints, xref_offset);
-  if (nRet == 1) {
-    if (!xref_offset) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLCRSOSSREF;
-    } else {
-      m_dwCurrentXRefSteam = xref_offset;
-      m_Pos = xref_offset;
-    }
-    return TRUE;
-  }
-  if (nRet == -1) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-  }
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::CheckCrossRef(IFX_DownloadHints* pHints) {
-  int32_t iSize = 0;
-  CFX_ByteString token;
-  if (!GetNextToken(token)) {
-    iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-    pHints->AddSegment(m_Pos, iSize);
-    return FALSE;
-  }
-  if (token == "xref") {
-    m_CrossOffset.InsertAt(0, m_dwXRefOffset);
-    while (1) {
-      if (!GetNextToken(token)) {
-        iSize =
-            (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-        pHints->AddSegment(m_Pos, iSize);
-        m_docStatus = PDF_DATAAVAIL_CROSSREF_ITEM;
-        return FALSE;
-      }
-      if (token == "trailer") {
-        m_dwTrailerOffset = m_Pos;
-        m_docStatus = PDF_DATAAVAIL_TRAILER;
-        return TRUE;
-      }
-    }
-  } else {
-    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-    return TRUE;
-  }
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::CheckTrailerAppend(IFX_DownloadHints* pHints) {
-  if (m_Pos < m_dwFileLen) {
-    FX_FILESIZE dwAppendPos = m_Pos + m_syntaxParser.SavePos();
-    int32_t iSize = (int32_t)(
-        dwAppendPos + 512 > m_dwFileLen ? m_dwFileLen - dwAppendPos : 512);
-    if (!m_pFileAvail->IsDataAvail(dwAppendPos, iSize)) {
-      pHints->AddSegment(dwAppendPos, iSize);
-      return FALSE;
-    }
-  }
-  if (m_dwPrevXRefOffset) {
-    SetStartOffset(m_dwPrevXRefOffset);
-    m_docStatus = PDF_DATAAVAIL_CROSSREF;
-  } else {
-    m_docStatus = PDF_DATAAVAIL_LOADALLCRSOSSREF;
-  }
-  return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
-  int32_t iTrailerSize =
-      (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
-  if (m_pFileAvail->IsDataAvail(m_Pos, iTrailerSize)) {
-    int32_t iSize = (int32_t)(m_Pos + iTrailerSize - m_dwTrailerOffset);
-    CFX_BinaryBuf buf(iSize);
-    uint8_t* pBuf = buf.GetBuffer();
-    if (!pBuf) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    if (!m_pFileRead->ReadBlock(pBuf, m_dwTrailerOffset, iSize)) {
-      return FALSE;
-    }
-    CFX_SmartPointer<IFX_FileStream> file(
-        FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
-    m_syntaxParser.InitParser(file.Get(), 0);
-    CPDF_Object* pTrailer = m_syntaxParser.GetObject(nullptr, 0, 0);
-    if (!pTrailer) {
-      m_Pos += m_syntaxParser.SavePos();
-      pHints->AddSegment(m_Pos, iTrailerSize);
-      return FALSE;
-    }
-    if (pTrailer->GetType() != PDFOBJ_DICTIONARY) {
-      pTrailer->Release();
-      return FALSE;
-    }
-    CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
-    CPDF_Object* pEncrypt = pTrailerDict->GetElement("Encrypt");
-    if (pEncrypt && pEncrypt->GetType() == PDFOBJ_REFERENCE) {
-      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      pTrailer->Release();
-      return TRUE;
-    }
-    FX_DWORD xrefpos = GetDirectInteger(pTrailer->GetDict(), FX_BSTRC("Prev"));
-    if (xrefpos) {
-      m_dwPrevXRefOffset =
-          GetDirectInteger(pTrailer->GetDict(), FX_BSTRC("XRefStm"));
-      pTrailer->Release();
-      if (m_dwPrevXRefOffset) {
-        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-      } else {
-        m_dwPrevXRefOffset = xrefpos;
-        if (m_dwPrevXRefOffset >= m_dwFileLen) {
-          m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
-        } else {
-          SetStartOffset(m_dwPrevXRefOffset);
-          m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
-        }
-      }
-      return TRUE;
-    }
-    m_dwPrevXRefOffset = 0;
-    m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
-    pTrailer->Release();
-    return TRUE;
-  }
-  pHints->AddSegment(m_Pos, iTrailerSize);
-  return FALSE;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPage(int32_t iPage, IFX_DownloadHints* pHints) {
-  while (TRUE) {
-    switch (m_docStatus) {
-      case PDF_DATAAVAIL_PAGETREE:
-        if (!LoadDocPages(pHints)) {
-          return FALSE;
-        }
-        break;
-      case PDF_DATAAVAIL_PAGE:
-        if (!LoadDocPage(iPage, pHints)) {
-          return FALSE;
-        }
-        break;
-      case PDF_DATAAVAIL_ERROR:
-        return LoadAllFile(pHints);
-      default:
-        m_bPagesTreeLoad = TRUE;
-        m_bPagesLoad = TRUE;
-        m_bCurPageDictLoadOK = TRUE;
-        m_docStatus = PDF_DATAAVAIL_PAGE;
-        return TRUE;
-    }
-  }
-}
-FX_BOOL CPDF_DataAvail::CheckArrayPageNode(FX_DWORD dwPageNo,
-                                           CPDF_PageNode* pPageNode,
-                                           IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(dwPageNo, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  if (!pPages) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    return FALSE;
-  }
-  if (pPages->GetType() != PDFOBJ_ARRAY) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  pPageNode->m_type = PDF_PAGENODE_PAGES;
-  CPDF_Array* pArray = (CPDF_Array*)pPages;
-  for (FX_DWORD i = 0; i < pArray->GetCount(); ++i) {
-    CPDF_Object* pKid = (CPDF_Object*)pArray->GetElement(i);
-    if (!pKid || pKid->GetType() != PDFOBJ_REFERENCE) {
-      continue;
-    }
-    CPDF_PageNode* pNode = new CPDF_PageNode();
-    pPageNode->m_childNode.Add(pNode);
-    pNode->m_dwPageNo = ((CPDF_Reference*)pKid)->GetRefObjNum();
-  }
-  pPages->Release();
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckUnkownPageNode(FX_DWORD dwPageNo,
-                                            CPDF_PageNode* pPageNode,
-                                            IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPage = GetObject(dwPageNo, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  if (!pPage) {
-    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
-      m_docStatus = PDF_DATAAVAIL_ERROR;
-      return FALSE;
-    }
-    return FALSE;
-  }
-  if (pPage->GetType() == PDFOBJ_ARRAY) {
-    pPageNode->m_dwPageNo = dwPageNo;
-    pPageNode->m_type = PDF_PAGENODE_ARRAY;
-    pPage->Release();
-    return TRUE;
-  }
-  if (pPage->GetType() != PDFOBJ_DICTIONARY) {
-    pPage->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  pPageNode->m_dwPageNo = dwPageNo;
-  CPDF_Dictionary* pDict = pPage->GetDict();
-  CFX_ByteString type = pDict->GetString(FX_BSTRC("Type"));
-  if (type == FX_BSTRC("Pages")) {
-    pPageNode->m_type = PDF_PAGENODE_PAGES;
-    CPDF_Object* pKids = pDict->GetElement(FX_BSTRC("Kids"));
-    if (!pKids) {
-      m_docStatus = PDF_DATAAVAIL_PAGE;
-      return TRUE;
-    }
-    switch (pKids->GetType()) {
-      case PDFOBJ_REFERENCE: {
-        CPDF_Reference* pKid = (CPDF_Reference*)pKids;
-        CPDF_PageNode* pNode = new CPDF_PageNode();
-        pPageNode->m_childNode.Add(pNode);
-        pNode->m_dwPageNo = pKid->GetRefObjNum();
-      } break;
-      case PDFOBJ_ARRAY: {
-        CPDF_Array* pKidsArray = (CPDF_Array*)pKids;
-        for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
-          CPDF_Object* pKid = (CPDF_Object*)pKidsArray->GetElement(i);
-          if (!pKid || pKid->GetType() != PDFOBJ_REFERENCE) {
-            continue;
-          }
-          CPDF_PageNode* pNode = new CPDF_PageNode();
-          pPageNode->m_childNode.Add(pNode);
-          pNode->m_dwPageNo = ((CPDF_Reference*)pKid)->GetRefObjNum();
-        }
-      } break;
-      default:
-        break;
-    }
-  } else if (type == FX_BSTRC("Page")) {
-    pPageNode->m_type = PDF_PAGENODE_PAGE;
-  } else {
-    pPage->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  pPage->Release();
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckPageNode(CPDF_PageNode& pageNodes,
-                                      int32_t iPage,
-                                      int32_t& iCount,
-                                      IFX_DownloadHints* pHints) {
-  int32_t iSize = pageNodes.m_childNode.GetSize();
-  if (iSize <= 0 || iPage >= iSize) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  for (int32_t i = 0; i < iSize; ++i) {
-    CPDF_PageNode* pNode = (CPDF_PageNode*)pageNodes.m_childNode.GetAt(i);
-    if (!pNode) {
-      continue;
-    }
-    switch (pNode->m_type) {
-      case PDF_PAGENODE_UNKOWN:
-        if (!CheckUnkownPageNode(pNode->m_dwPageNo, pNode, pHints)) {
-          return FALSE;
-        }
-        --i;
-        break;
-      case PDF_PAGENODE_PAGE:
-        iCount++;
-        if (iPage == iCount && m_pDocument) {
-          m_pDocument->m_PageList.SetAt(iPage, pNode->m_dwPageNo);
-        }
-        break;
-      case PDF_PAGENODE_PAGES:
-        if (!CheckPageNode(*pNode, iPage, iCount, pHints)) {
-          return FALSE;
-        }
-        break;
-      case PDF_PAGENODE_ARRAY:
-        if (!CheckArrayPageNode(pNode->m_dwPageNo, pNode, pHints)) {
-          return FALSE;
-        }
-        --i;
-        break;
-    }
-    if (iPage == iCount) {
-      m_docStatus = PDF_DATAAVAIL_DONE;
-      return TRUE;
-    }
-  }
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::LoadDocPage(int32_t iPage, IFX_DownloadHints* pHints) {
-  if (m_pDocument->GetPageCount() <= iPage ||
-      m_pDocument->m_PageList.GetAt(iPage)) {
-    m_docStatus = PDF_DATAAVAIL_DONE;
-    return TRUE;
-  }
-  if (m_pageNodes.m_type == PDF_PAGENODE_PAGE) {
-    if (iPage == 0) {
-      m_docStatus = PDF_DATAAVAIL_DONE;
-      return TRUE;
-    }
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return TRUE;
-  }
-  int32_t iCount = -1;
-  return CheckPageNode(m_pageNodes, iPage, iCount, pHints);
-}
-FX_BOOL CPDF_DataAvail::CheckPageCount(IFX_DownloadHints* pHints) {
-  FX_BOOL bExist = FALSE;
-  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
-  if (!bExist) {
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  if (!pPages) {
-    return FALSE;
-  }
-  CPDF_Dictionary* pPagesDict = pPages->GetDict();
-  if (!pPagesDict) {
-    pPages->Release();
-    m_docStatus = PDF_DATAAVAIL_ERROR;
-    return FALSE;
-  }
-  if (!pPagesDict->KeyExist(FX_BSTRC("Kids"))) {
-    pPages->Release();
-    return TRUE;
-  }
-  int count = pPagesDict->GetInteger(FX_BSTRC("Count"));
-  if (count > 0) {
-    pPages->Release();
-    return TRUE;
-  }
-  pPages->Release();
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::LoadDocPages(IFX_DownloadHints* pHints) {
-  if (!CheckUnkownPageNode(m_PagesObjNum, &m_pageNodes, pHints)) {
-    return FALSE;
-  }
-  if (CheckPageCount(pHints)) {
-    m_docStatus = PDF_DATAAVAIL_PAGE;
-    return TRUE;
-  }
-  m_bTotalLoadPageTree = TRUE;
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::LoadPages(IFX_DownloadHints* pHints) {
-  while (!m_bPagesTreeLoad) {
-    if (!CheckPageStatus(pHints)) {
-      return FALSE;
-    }
-  }
-  if (m_bPagesLoad) {
-    return TRUE;
-  }
-  m_pDocument->LoadPages();
-  return FALSE;
-}
-FX_BOOL CPDF_DataAvail::CheckLinearizedData(IFX_DownloadHints* pHints) {
-  if (m_bLinearedDataOK) {
-    return TRUE;
-  }
-
-  if (!m_bMainXRefLoadTried) {
-    FX_SAFE_DWORD data_size = m_dwFileLen;
-    data_size -= m_dwLastXRefOffset;
-    if (!data_size.IsValid()) {
-      return FALSE;
-    }
-    if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
-                                   data_size.ValueOrDie())) {
-      pHints->AddSegment(m_dwLastXRefOffset, data_size.ValueOrDie());
-      return FALSE;
-    }
-    FX_DWORD dwRet =
-        ((CPDF_Parser*)m_pDocument->GetParser())->LoadLinearizedMainXRefTable();
-    m_bMainXRefLoadTried = TRUE;
-    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
-      return FALSE;
-    }
-    if (!PreparePageItem()) {
-      return FALSE;
-    }
-    m_bMainXRefLoadedOK = TRUE;
-    m_bLinearedDataOK = TRUE;
-  }
-
-  return m_bLinearedDataOK;
-}
-FX_BOOL CPDF_DataAvail::CheckPageAnnots(int32_t iPage,
-                                        IFX_DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    m_objnum_array.RemoveAll();
-    CPDF_Dictionary* pPageDict = m_pDocument->GetPage(iPage);
-    if (!pPageDict) {
-      return TRUE;
-    }
-    CPDF_Object* pAnnots = pPageDict->GetElement(FX_BSTRC("Annots"));
-    if (!pAnnots) {
-      return TRUE;
-    }
-    CFX_PtrArray obj_array;
-    obj_array.Add(pAnnots);
-    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
-    if (bRet) {
-      m_objs_array.RemoveAll();
-    }
-    return bRet;
-  }
-  CFX_PtrArray new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet) {
-    m_objs_array.Append(new_objs_array);
-  }
-  return bRet;
-}
-FX_BOOL CPDF_DataAvail::CheckLinearizedFirstPage(int32_t iPage,
-                                                 IFX_DownloadHints* pHints) {
-  if (!m_bAnnotsLoad) {
-    if (!CheckPageAnnots(iPage, pHints)) {
-      return FALSE;
-    }
-    m_bAnnotsLoad = TRUE;
-  }
-  if (m_bAnnotsLoad) {
-    if (!CheckLinearizedData(pHints))
-      return FALSE;
-  }
-  m_bPageLoadedOK = FALSE;
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::HaveResourceAncestor(CPDF_Dictionary* pDict) {
-  CFX_AutoRestorer<int> restorer(&s_CurrentDataAvailRecursionDepth);
-  if (++s_CurrentDataAvailRecursionDepth > kMaxDataAvailRecursionDepth) {
-    return FALSE;
-  }
-  CPDF_Object* pParent = pDict->GetElement("Parent");
-  if (!pParent) {
-    return FALSE;
-  }
-  CPDF_Dictionary* pParentDict = pParent->GetDict();
-  if (!pParentDict) {
-    return FALSE;
-  }
-  CPDF_Object* pRet = pParentDict->GetElement("Resources");
-  if (pRet) {
-    m_pPageResource = pRet;
-    return TRUE;
-  }
-  return HaveResourceAncestor(pParentDict);
-}
-FX_BOOL CPDF_DataAvail::IsPageAvail(int32_t iPage, IFX_DownloadHints* pHints) {
-  if (!m_pDocument) {
-    return FALSE;
-  }
-  if (IsFirstCheck(iPage)) {
-    m_bCurPageDictLoadOK = FALSE;
-    m_bPageLoadedOK = FALSE;
-    m_bAnnotsLoad = FALSE;
-    m_bNeedDownLoadResource = FALSE;
-    m_objs_array.RemoveAll();
-    m_objnum_array.RemoveAll();
-  }
-  if (m_pagesLoadState.find(iPage) != m_pagesLoadState.end()) {
-    return TRUE;
-  }
-  if (m_bLinearized) {
-    if ((FX_DWORD)iPage == m_dwFirstPageNo) {
-      m_pagesLoadState.insert(iPage);
-      return TRUE;
-    }
-    if (!CheckLinearizedData(pHints)) {
-      return FALSE;
-    }
-    if (m_bMainXRefLoadedOK) {
-      if (m_bTotalLoadPageTree) {
-        if (!LoadPages(pHints)) {
-          return FALSE;
-        }
-      } else {
-        if (!m_bCurPageDictLoadOK && !CheckPage(iPage, pHints)) {
-          return FALSE;
-        }
-      }
-    } else {
-      if (!LoadAllFile(pHints)) {
-        return FALSE;
-      }
-      ((CPDF_Parser*)m_pDocument->GetParser())->RebuildCrossRef();
-      ResetFirstCheck(iPage);
-      return TRUE;
-    }
-  } else {
-    if (!m_bTotalLoadPageTree) {
-      if (!m_bCurPageDictLoadOK && !CheckPage(iPage, pHints)) {
-        return FALSE;
-      }
-    }
-  }
-  if (m_bHaveAcroForm && !m_bAcroFormLoad) {
-    if (!CheckAcroFormSubObject(pHints)) {
-      return FALSE;
-    }
-    m_bAcroFormLoad = TRUE;
-  }
-  if (!m_bPageLoadedOK) {
-    if (!m_objs_array.GetSize()) {
-      m_objs_array.RemoveAll();
-      m_objnum_array.RemoveAll();
-      m_pPageDict = m_pDocument->GetPage(iPage);
-      if (!m_pPageDict) {
-        ResetFirstCheck(iPage);
-        return TRUE;
-      }
-      CFX_PtrArray obj_array;
-      obj_array.Add(m_pPageDict);
-      FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
-      if (bRet) {
-        m_objs_array.RemoveAll();
-        m_bPageLoadedOK = TRUE;
-      } else {
-        return bRet;
-      }
-    } else {
-      CFX_PtrArray new_objs_array;
-      FX_BOOL bRet =
-          IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-      m_objs_array.RemoveAll();
-      if (bRet) {
-        m_bPageLoadedOK = TRUE;
-      } else {
-        m_objs_array.Append(new_objs_array);
-        return bRet;
-      }
-    }
-  }
-  if (m_bPageLoadedOK) {
-    if (!m_bAnnotsLoad) {
-      if (!CheckPageAnnots(iPage, pHints)) {
-        return FALSE;
-      }
-      m_bAnnotsLoad = TRUE;
-    }
-  }
-  if (m_pPageDict && !m_bNeedDownLoadResource) {
-    m_pPageResource = m_pPageDict->GetElement("Resources");
-    if (!m_pPageResource) {
-      m_bNeedDownLoadResource = HaveResourceAncestor(m_pPageDict);
-    } else {
-      m_bNeedDownLoadResource = TRUE;
-    }
-  }
-  if (m_bNeedDownLoadResource) {
-    FX_BOOL bRet = CheckResources(pHints);
-    if (!bRet) {
-      return FALSE;
-    }
-    m_bNeedDownLoadResource = FALSE;
-  }
-  m_bPageLoadedOK = FALSE;
-  m_bAnnotsLoad = FALSE;
-  m_bCurPageDictLoadOK = FALSE;
-  ResetFirstCheck(iPage);
-  m_pagesLoadState.insert(iPage);
-  return TRUE;
-}
-FX_BOOL CPDF_DataAvail::CheckResources(IFX_DownloadHints* pHints) {
-  if (!m_objs_array.GetSize()) {
-    m_objs_array.RemoveAll();
-    CFX_PtrArray obj_array;
-    obj_array.Add(m_pPageResource);
-    FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
-    if (bRet) {
-      m_objs_array.RemoveAll();
-    }
-    return bRet;
-  }
-  CFX_PtrArray new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet) {
-    m_objs_array.Append(new_objs_array);
-  }
-  return bRet;
-}
-void CPDF_DataAvail::GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
-                                               FX_DWORD* pSize) {
-  if (pPos) {
-    *pPos = m_dwLastXRefOffset;
-  }
-  if (pSize) {
-    *pSize = (FX_DWORD)(m_dwFileLen - m_dwLastXRefOffset);
-  }
-}
-int32_t CPDF_DataAvail::IsFormAvail(IFX_DownloadHints* pHints) {
-  if (!m_pDocument) {
-    return PDFFORM_AVAIL;
-  }
-  if (!m_bLinearizedFormParamLoad) {
-    CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
-    if (!pRoot) {
-      return PDFFORM_AVAIL;
-    }
-    CPDF_Object* pAcroForm = pRoot->GetElement(FX_BSTRC("AcroForm"));
-    if (!pAcroForm) {
-      return PDFFORM_NOTEXIST;
-    }
-    if (!CheckLinearizedData(pHints)) {
-      return PDFFORM_NOTAVAIL;
-    }
-    if (!m_objs_array.GetSize()) {
-      m_objs_array.Add(pAcroForm->GetDict());
-    }
-    m_bLinearizedFormParamLoad = TRUE;
-  }
-  CFX_PtrArray new_objs_array;
-  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
-  m_objs_array.RemoveAll();
-  if (!bRet) {
-    m_objs_array.Append(new_objs_array);
-    return PDFFORM_NOTAVAIL;
-  }
-  return PDFFORM_AVAIL;
-}
-void CPDF_SortObjNumArray::AddObjNum(FX_DWORD dwObjNum) {
-  int32_t iNext = 0;
-  if (BinarySearch(dwObjNum, iNext)) {
-    return;
-  }
-  m_number_array.InsertAt(iNext, dwObjNum);
-}
-FX_BOOL CPDF_SortObjNumArray::Find(FX_DWORD dwObjNum) {
-  int32_t iNext = 0;
-  return BinarySearch(dwObjNum, iNext);
-}
-FX_BOOL CPDF_SortObjNumArray::BinarySearch(FX_DWORD value, int32_t& iNext) {
-  int32_t iLow = 0;
-  int32_t iHigh = m_number_array.GetSize() - 1;
-  while (iLow <= iHigh) {
-    int32_t iMid = (iLow + iHigh) / 2;
-    if (m_number_array.GetAt(iMid) == value) {
-      iNext = iMid;
-      return TRUE;
-    }
-    if (m_number_array.GetAt(iMid) > value) {
-      iHigh = iMid - 1;
-    } else if (m_number_array.GetAt(iMid) < value) {
-      iLow = iMid + 1;
-    }
-  }
-  iNext = iLow;
-  return FALSE;
-}
-CPDF_PageNode::~CPDF_PageNode() {
-  int32_t iSize = m_childNode.GetSize();
-  for (int32_t i = 0; i < iSize; ++i) {
-    CPDF_PageNode* pNode = (CPDF_PageNode*)m_childNode[i];
-    delete pNode;
-  }
-  m_childNode.RemoveAll();
-}
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include <set>
+#include <utility>
+#include <vector>
+
+#include "../../../include/fpdfapi/fpdf_module.h"
+#include "../../../include/fpdfapi/fpdf_page.h"
+#include "../../../include/fpdfapi/fpdf_parser.h"
+#include "../../../include/fxcrt/fx_safe_types.h"
+#include "../fpdf_page/pageint.h"
+#include "./parser_int.h"

[Tom Sepez, 2015/09/22 00:05:38]

nit: no ./

[jun_fang, 2015/09/22 12:42:31]

Acknowledged.

+
+FX_BOOL IsSignatureDict(const CPDF_Dictionary* pDict) {
+  CPDF_Object* pType = pDict->GetElementValue(FX_BSTRC("Type"));
+  if (!pType) {
+    pType = pDict->GetElementValue(FX_BSTRC("FT"));
+    if (!pType) {
+      return FALSE;
+    }
+  }
+  if (pType->GetString() == FX_BSTRC("Sig")) {
+    return TRUE;
+  }
+  return FALSE;
+}
+static int _CompareFileSize(const void* p1, const void* p2) {
+  FX_FILESIZE ret = (*(FX_FILESIZE*)p1) - (*(FX_FILESIZE*)p2);
+  if (ret > 0) {
+    return 1;
+  }
+  if (ret < 0) {
+    return -1;
+  }
+  return 0;
+}
+
+CPDF_Parser::CPDF_Parser() {
+  m_pDocument = NULL;
+  m_pTrailer = NULL;
+  m_pEncryptDict = NULL;
+  m_pSecurityHandler = NULL;
+  m_pLinearized = NULL;
+  m_dwFirstPageNo = 0;
+  m_dwXrefStartObjNum = 0;
+  m_bOwnFileRead = TRUE;
+  m_FileVersion = 0;
+  m_bForceUseSecurityHandler = FALSE;
+}
+CPDF_Parser::~CPDF_Parser() {
+  CloseParser(FALSE);
+}
+FX_DWORD CPDF_Parser::GetLastObjNum() {
+  FX_DWORD dwSize = m_CrossRef.GetSize();
+  return dwSize ? dwSize - 1 : 0;
+}
+void CPDF_Parser::SetEncryptDictionary(CPDF_Dictionary* pDict) {
+  m_pEncryptDict = pDict;
+}
+void CPDF_Parser::CloseParser(FX_BOOL bReParse) {
+  m_bVersionUpdated = FALSE;
+  if (!bReParse) {
+    delete m_pDocument;
+    m_pDocument = NULL;
+  }
+  if (m_pTrailer) {
+    m_pTrailer->Release();
+    m_pTrailer = NULL;
+  }
+  ReleaseEncryptHandler();
+  SetEncryptDictionary(NULL);
+  if (m_bOwnFileRead && m_Syntax.m_pFileAccess) {
+    m_Syntax.m_pFileAccess->Release();
+    m_Syntax.m_pFileAccess = NULL;
+  }
+  FX_POSITION pos = m_ObjectStreamMap.GetStartPosition();
+  while (pos) {
+    void* objnum;
+    CPDF_StreamAcc* pStream;
+    m_ObjectStreamMap.GetNextAssoc(pos, objnum, (void*&)pStream);
+    delete pStream;
+  }
+  m_ObjectStreamMap.RemoveAll();
+  m_SortedOffset.RemoveAll();
+  m_CrossRef.RemoveAll();
+  m_V5Type.RemoveAll();
+  m_ObjVersion.RemoveAll();
+  int32_t iLen = m_Trailers.GetSize();
+  for (int32_t i = 0; i < iLen; ++i) {
+    if (CPDF_Dictionary* trailer = m_Trailers.GetAt(i))
+      trailer->Release();
+  }
+  m_Trailers.RemoveAll();
+  if (m_pLinearized) {
+    m_pLinearized->Release();
+    m_pLinearized = NULL;
+  }
+}
+static int32_t GetHeaderOffset(IFX_FileRead* pFile) {
+  FX_DWORD tag = FXDWORD_FROM_LSBFIRST(0x46445025);
+  uint8_t buf[4];
+  int32_t offset = 0;
+  while (1) {
+    if (!pFile->ReadBlock(buf, offset, 4)) {
+      return -1;
+    }
+    if (*(FX_DWORD*)buf == tag) {
+      return offset;
+    }
+    offset++;
+    if (offset > 1024) {
+      return -1;
+    }
+  }
+  return -1;
+}
+CPDF_SecurityHandler* FPDF_CreateStandardSecurityHandler();
+CPDF_SecurityHandler* FPDF_CreatePubKeyHandler(void*);
+FX_DWORD CPDF_Parser::StartParse(IFX_FileRead* pFileAccess,
+                                 FX_BOOL bReParse,
+                                 FX_BOOL bOwnFileRead) {
+  CloseParser(bReParse);
+  m_bXRefStream = FALSE;
+  m_LastXRefOffset = 0;
+  m_bOwnFileRead = bOwnFileRead;
+  int32_t offset = GetHeaderOffset(pFileAccess);
+  if (offset == -1) {
+    if (bOwnFileRead && pFileAccess) {
+      pFileAccess->Release();
+    }
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  m_Syntax.InitParser(pFileAccess, offset);
+  uint8_t ch;
+  if (!m_Syntax.GetCharAt(5, ch)) {
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  if (ch >= '0' && ch <= '9') {
+    m_FileVersion = (ch - '0') * 10;
+  }
+  if (!m_Syntax.GetCharAt(7, ch)) {
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  if (ch >= '0' && ch <= '9') {
+    m_FileVersion += ch - '0';
+  }
+  if (m_Syntax.m_FileLen < m_Syntax.m_HeaderOffset + 9) {
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  m_Syntax.RestorePos(m_Syntax.m_FileLen - m_Syntax.m_HeaderOffset - 9);
+  if (!bReParse) {
+    m_pDocument = new CPDF_Document(this);
+  }
+  FX_BOOL bXRefRebuilt = FALSE;
+  if (m_Syntax.SearchWord(FX_BSTRC("startxref"), TRUE, FALSE, 4096)) {
+    FX_FILESIZE startxref_offset = m_Syntax.SavePos();
+    void* pResult = FXSYS_bsearch(&startxref_offset, m_SortedOffset.GetData(),
+                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+                                  _CompareFileSize);
+    if (pResult == NULL) {
+      m_SortedOffset.Add(startxref_offset);
+    }
+    m_Syntax.GetKeyword();
+    FX_BOOL bNumber;
+    CFX_ByteString xrefpos_str = m_Syntax.GetNextWord(bNumber);
+    if (!bNumber) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    m_LastXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str);
+    if (!LoadAllCrossRefV4(m_LastXRefOffset) &&
+        !LoadAllCrossRefV5(m_LastXRefOffset)) {
+      if (!RebuildCrossRef()) {
+        return PDFPARSE_ERROR_FORMAT;
+      }
+      bXRefRebuilt = TRUE;
+      m_LastXRefOffset = 0;
+    }
+  } else {
+    if (!RebuildCrossRef()) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    bXRefRebuilt = TRUE;
+  }
+  FX_DWORD dwRet = SetEncryptHandler();
+  if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+    return dwRet;
+  }
+  m_pDocument->LoadDoc();
+  if (m_pDocument->GetRoot() == NULL || m_pDocument->GetPageCount() == 0) {
+    if (bXRefRebuilt) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    ReleaseEncryptHandler();
+    if (!RebuildCrossRef()) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    dwRet = SetEncryptHandler();
+    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+      return dwRet;
+    }
+    m_pDocument->LoadDoc();
+    if (m_pDocument->GetRoot() == NULL) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+  }
+  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+              sizeof(FX_FILESIZE), _CompareFileSize);
+  FX_DWORD RootObjNum = GetRootObjNum();
+  if (RootObjNum == 0) {
+    ReleaseEncryptHandler();
+    RebuildCrossRef();
+    RootObjNum = GetRootObjNum();
+    if (RootObjNum == 0) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    dwRet = SetEncryptHandler();
+    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+      return dwRet;
+    }
+  }
+  if (m_pSecurityHandler && !m_pSecurityHandler->IsMetadataEncrypted()) {
+    CPDF_Reference* pMetadata =
+        (CPDF_Reference*)m_pDocument->GetRoot()->GetElement(
+            FX_BSTRC("Metadata"));
+    if (pMetadata && pMetadata->GetType() == PDFOBJ_REFERENCE) {
+      m_Syntax.m_MetadataObjnum = pMetadata->GetRefObjNum();
+    }
+  }
+  return PDFPARSE_ERROR_SUCCESS;
+}
+FX_DWORD CPDF_Parser::SetEncryptHandler() {
+  ReleaseEncryptHandler();
+  SetEncryptDictionary(NULL);
+  if (m_pTrailer == NULL) {
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  CPDF_Object* pEncryptObj = m_pTrailer->GetElement(FX_BSTRC("Encrypt"));
+  if (pEncryptObj) {
+    if (pEncryptObj->GetType() == PDFOBJ_DICTIONARY) {
+      SetEncryptDictionary((CPDF_Dictionary*)pEncryptObj);
+    } else if (pEncryptObj->GetType() == PDFOBJ_REFERENCE) {
+      pEncryptObj = m_pDocument->GetIndirectObject(
+          ((CPDF_Reference*)pEncryptObj)->GetRefObjNum());
+      if (pEncryptObj) {
+        SetEncryptDictionary(pEncryptObj->GetDict());
+      }
+    }
+  }
+  if (m_bForceUseSecurityHandler) {
+    FX_DWORD err = PDFPARSE_ERROR_HANDLER;
+    if (m_pSecurityHandler == NULL) {
+      return PDFPARSE_ERROR_HANDLER;
+    }
+    if (!m_pSecurityHandler->OnInit(this, m_pEncryptDict)) {
+      return err;
+    }
+    CPDF_CryptoHandler* pCryptoHandler =
+        m_pSecurityHandler->CreateCryptoHandler();
+    if (!pCryptoHandler->Init(m_pEncryptDict, m_pSecurityHandler)) {
+      delete pCryptoHandler;
+      pCryptoHandler = NULL;
+      return PDFPARSE_ERROR_HANDLER;
+    }
+    m_Syntax.SetEncrypt(pCryptoHandler);
+  } else if (m_pEncryptDict) {
+    CFX_ByteString filter = m_pEncryptDict->GetString(FX_BSTRC("Filter"));
+    CPDF_SecurityHandler* pSecurityHandler = NULL;
+    FX_DWORD err = PDFPARSE_ERROR_HANDLER;
+    if (filter == FX_BSTRC("Standard")) {
+      pSecurityHandler = FPDF_CreateStandardSecurityHandler();
+      err = PDFPARSE_ERROR_PASSWORD;
+    }
+    if (pSecurityHandler == NULL) {
+      return PDFPARSE_ERROR_HANDLER;
+    }
+    if (!pSecurityHandler->OnInit(this, m_pEncryptDict)) {
+      delete pSecurityHandler;
+      pSecurityHandler = NULL;
+      return err;
+    }
+    m_pSecurityHandler = pSecurityHandler;
+    CPDF_CryptoHandler* pCryptoHandler =
+        pSecurityHandler->CreateCryptoHandler();
+    if (!pCryptoHandler->Init(m_pEncryptDict, m_pSecurityHandler)) {
+      delete pCryptoHandler;
+      pCryptoHandler = NULL;
+      return PDFPARSE_ERROR_HANDLER;
+    }
+    m_Syntax.SetEncrypt(pCryptoHandler);
+  }
+  return PDFPARSE_ERROR_SUCCESS;
+}
+void CPDF_Parser::ReleaseEncryptHandler() {
+  delete m_Syntax.m_pCryptoHandler;
+  m_Syntax.m_pCryptoHandler = NULL;
+  if (!m_bForceUseSecurityHandler) {
+    delete m_pSecurityHandler;
+    m_pSecurityHandler = NULL;
+  }
+}
+FX_FILESIZE CPDF_Parser::GetObjectOffset(FX_DWORD objnum) {
+  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
+    return 0;
+  }
+  if (m_V5Type[objnum] == 1) {
+    return m_CrossRef[objnum];
+  }
+  if (m_V5Type[objnum] == 2) {
+    return m_CrossRef[(int32_t)m_CrossRef[objnum]];
+  }
+  return 0;
+}
+static int32_t GetDirectInteger(CPDF_Dictionary* pDict,
+                                const CFX_ByteStringC& key) {
+  CPDF_Object* pObj = pDict->GetElement(key);
+  if (pObj == NULL) {
+    return 0;
+  }
+  if (pObj->GetType() == PDFOBJ_NUMBER) {
+    return ((CPDF_Number*)pObj)->GetInteger();
+  }
+  return 0;
+}
+static FX_BOOL CheckDirectType(CPDF_Dictionary* pDict,
+                               const CFX_ByteStringC& key,
+                               int32_t iType) {
+  CPDF_Object* pObj = pDict->GetElement(key);
+  if (!pObj) {
+    return TRUE;
+  }
+  return pObj->GetType() == iType;
+}
+FX_BOOL CPDF_Parser::LoadAllCrossRefV4(FX_FILESIZE xrefpos) {
+  if (!LoadCrossRefV4(xrefpos, 0, TRUE, FALSE)) {
+    return FALSE;
+  }
+  m_pTrailer = LoadTrailerV4();
+  if (m_pTrailer == NULL) {
+    return FALSE;
+  }
+  int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
+  if (xrefsize <= 0 || xrefsize > (1 << 20)) {
+    return FALSE;
+  }
+  m_CrossRef.SetSize(xrefsize);
+  m_V5Type.SetSize(xrefsize);
+  CFX_FileSizeArray CrossRefList, XRefStreamList;
+  CrossRefList.Add(xrefpos);
+  XRefStreamList.Add(GetDirectInteger(m_pTrailer, FX_BSTRC("XRefStm")));
+  if (!CheckDirectType(m_pTrailer, FX_BSTRC("Prev"), PDFOBJ_NUMBER)) {
+    return FALSE;
+  }
+  FX_FILESIZE newxrefpos = GetDirectInteger(m_pTrailer, FX_BSTRC("Prev"));
+  if (newxrefpos == xrefpos) {
+    return FALSE;
+  }
+  xrefpos = newxrefpos;
+  while (xrefpos) {
+    CrossRefList.InsertAt(0, xrefpos);
+    LoadCrossRefV4(xrefpos, 0, TRUE, FALSE);
+    CPDF_Dictionary* pDict = LoadTrailerV4();
+    if (pDict == NULL) {
+      return FALSE;
+    }
+    if (!CheckDirectType(pDict, FX_BSTRC("Prev"), PDFOBJ_NUMBER)) {
+      pDict->Release();
+      return FALSE;
+    }
+    newxrefpos = GetDirectInteger(pDict, FX_BSTRC("Prev"));
+    if (newxrefpos == xrefpos) {
+      pDict->Release();
+      return FALSE;
+    }
+    xrefpos = newxrefpos;
+    XRefStreamList.InsertAt(0, pDict->GetInteger(FX_BSTRC("XRefStm")));
+    m_Trailers.Add(pDict);
+  }
+  for (int32_t i = 0; i < CrossRefList.GetSize(); i++)
+    if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE, i == 0)) {
+      return FALSE;
+    }
+  return TRUE;
+}
+FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV4(FX_FILESIZE xrefpos,
+                                                 FX_DWORD dwObjCount) {
+  if (!LoadLinearizedCrossRefV4(xrefpos, dwObjCount)) {
+    return FALSE;
+  }
+  m_pTrailer = LoadTrailerV4();
+  if (m_pTrailer == NULL) {
+    return FALSE;
+  }
+  int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
+  if (xrefsize == 0) {
+    return FALSE;
+  }
+  CFX_FileSizeArray CrossRefList, XRefStreamList;
+  CrossRefList.Add(xrefpos);
+  XRefStreamList.Add(GetDirectInteger(m_pTrailer, FX_BSTRC("XRefStm")));
+  xrefpos = GetDirectInteger(m_pTrailer, FX_BSTRC("Prev"));
+  while (xrefpos) {
+    CrossRefList.InsertAt(0, xrefpos);
+    LoadCrossRefV4(xrefpos, 0, TRUE, FALSE);
+    CPDF_Dictionary* pDict = LoadTrailerV4();
+    if (pDict == NULL) {
+      return FALSE;
+    }
+    xrefpos = GetDirectInteger(pDict, FX_BSTRC("Prev"));
+    XRefStreamList.InsertAt(0, pDict->GetInteger(FX_BSTRC("XRefStm")));
+    m_Trailers.Add(pDict);
+  }
+  for (int32_t i = 1; i < CrossRefList.GetSize(); i++)
+    if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE, i == 0)) {
+      return FALSE;
+    }
+  return TRUE;
+}
+FX_BOOL CPDF_Parser::LoadLinearizedCrossRefV4(FX_FILESIZE pos,
+                                              FX_DWORD dwObjCount) {
+  FX_FILESIZE dwStartPos = pos - m_Syntax.m_HeaderOffset;
+  m_Syntax.RestorePos(dwStartPos);
+  void* pResult =
+      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+                    sizeof(FX_FILESIZE), _CompareFileSize);
+  if (pResult == NULL) {
+    m_SortedOffset.Add(pos);
+  }
+  FX_DWORD start_objnum = 0;
+  FX_DWORD count = dwObjCount;
+  FX_FILESIZE SavedPos = m_Syntax.SavePos();
+  int32_t recordsize = 20;
+  char* pBuf = FX_Alloc(char, 1024 * recordsize + 1);
+  pBuf[1024 * recordsize] = '\0';
+  int32_t nBlocks = count / 1024 + 1;
+  for (int32_t block = 0; block < nBlocks; block++) {
+    int32_t block_size = block == nBlocks - 1 ? count % 1024 : 1024;
+    FX_DWORD dwReadSize = block_size * recordsize;
+    if ((FX_FILESIZE)(dwStartPos + dwReadSize) > m_Syntax.m_FileLen) {
+      FX_Free(pBuf);
+      return FALSE;
+    }
+    if (!m_Syntax.ReadBlock((uint8_t*)pBuf, dwReadSize)) {
+      FX_Free(pBuf);
+      return FALSE;
+    }
+    for (int32_t i = 0; i < block_size; i++) {
+      FX_DWORD objnum = start_objnum + block * 1024 + i;
+      char* pEntry = pBuf + i * recordsize;
+      if (pEntry[17] == 'f') {
+        m_CrossRef.SetAtGrow(objnum, 0);
+        m_V5Type.SetAtGrow(objnum, 0);
+      } else {
+        int32_t offset = FXSYS_atoi(pEntry);
+        if (offset == 0) {
+          for (int32_t c = 0; c < 10; c++) {
+            if (pEntry[c] < '0' || pEntry[c] > '9') {
+              FX_Free(pBuf);
+              return FALSE;
+            }
+          }
+        }
+        m_CrossRef.SetAtGrow(objnum, offset);
+        int32_t version = FXSYS_atoi(pEntry + 11);
+        if (version >= 1) {
+          m_bVersionUpdated = TRUE;
+        }
+        m_ObjVersion.SetAtGrow(objnum, version);
+        if (m_CrossRef[objnum] < m_Syntax.m_FileLen) {
+          void* pResult = FXSYS_bsearch(
+              &m_CrossRef[objnum], m_SortedOffset.GetData(),
+              m_SortedOffset.GetSize(), sizeof(FX_FILESIZE), _CompareFileSize);
+          if (pResult == NULL) {
+            m_SortedOffset.Add(m_CrossRef[objnum]);
+          }
+        }
+        m_V5Type.SetAtGrow(objnum, 1);
+      }
+    }
+  }
+  FX_Free(pBuf);
+  m_Syntax.RestorePos(SavedPos + count * recordsize);
+  return TRUE;
+}
+FX_BOOL CPDF_Parser::LoadCrossRefV4(FX_FILESIZE pos,
+                                    FX_FILESIZE streampos,
+                                    FX_BOOL bSkip,
+                                    FX_BOOL bFirst) {
+  m_Syntax.RestorePos(pos);
+  if (m_Syntax.GetKeyword() != FX_BSTRC("xref")) {
+    return FALSE;
+  }
+  void* pResult =
+      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+                    sizeof(FX_FILESIZE), _CompareFileSize);
+  if (pResult == NULL) {
+    m_SortedOffset.Add(pos);
+  }
+  if (streampos) {
+    void* pResult = FXSYS_bsearch(&streampos, m_SortedOffset.GetData(),
+                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+                                  _CompareFileSize);
+    if (pResult == NULL) {
+      m_SortedOffset.Add(streampos);
+    }
+  }
+  while (1) {
+    FX_FILESIZE SavedPos = m_Syntax.SavePos();
+    FX_BOOL bIsNumber;
+    CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
+    if (word.IsEmpty()) {
+      return FALSE;
+    }
+    if (!bIsNumber) {
+      m_Syntax.RestorePos(SavedPos);
+      break;
+    }
+    FX_DWORD start_objnum = FXSYS_atoi(word);
+    if (start_objnum >= (1 << 20)) {
+      return FALSE;
+    }
+    FX_DWORD count = m_Syntax.GetDirectNum();
+    m_Syntax.ToNextWord();
+    SavedPos = m_Syntax.SavePos();
+    FX_BOOL bFirstItem = FALSE;
+    int32_t recordsize = 20;
+    if (bFirst) {
+      bFirstItem = TRUE;
+    }
+    m_dwXrefStartObjNum = start_objnum;
+    if (!bSkip) {
+      char* pBuf = FX_Alloc(char, 1024 * recordsize + 1);
+      pBuf[1024 * recordsize] = '\0';
+      int32_t nBlocks = count / 1024 + 1;
+      FX_BOOL bFirstBlock = TRUE;
+      for (int32_t block = 0; block < nBlocks; block++) {
+        int32_t block_size = block == nBlocks - 1 ? count % 1024 : 1024;
+        m_Syntax.ReadBlock((uint8_t*)pBuf, block_size * recordsize);
+        for (int32_t i = 0; i < block_size; i++) {
+          FX_DWORD objnum = start_objnum + block * 1024 + i;
+          char* pEntry = pBuf + i * recordsize;
+          if (pEntry[17] == 'f') {
+            if (bFirstItem) {
+              objnum = 0;
+              bFirstItem = FALSE;
+            }
+            if (bFirstBlock) {
+              FX_FILESIZE offset = (FX_FILESIZE)FXSYS_atoi64(pEntry);
+              int32_t version = FXSYS_atoi(pEntry + 11);
+              if (offset == 0 && version == 65535 && start_objnum != 0) {
+                start_objnum--;
+                objnum = 0;
+              }
+            }
+            m_CrossRef.SetAtGrow(objnum, 0);
+            m_V5Type.SetAtGrow(objnum, 0);
+          } else {
+            FX_FILESIZE offset = (FX_FILESIZE)FXSYS_atoi64(pEntry);
+            if (offset == 0) {
+              for (int32_t c = 0; c < 10; c++) {
+                if (pEntry[c] < '0' || pEntry[c] > '9') {
+                  FX_Free(pBuf);
+                  return FALSE;
+                }
+              }
+            }
+            m_CrossRef.SetAtGrow(objnum, offset);
+            int32_t version = FXSYS_atoi(pEntry + 11);
+            if (version >= 1) {
+              m_bVersionUpdated = TRUE;
+            }
+            m_ObjVersion.SetAtGrow(objnum, version);
+            if (m_CrossRef[objnum] < m_Syntax.m_FileLen) {
+              void* pResult =
+                  FXSYS_bsearch(&m_CrossRef[objnum], m_SortedOffset.GetData(),
+                                m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+                                _CompareFileSize);
+              if (pResult == NULL) {
+                m_SortedOffset.Add(m_CrossRef[objnum]);
+              }
+            }
+            m_V5Type.SetAtGrow(objnum, 1);
+          }
+          if (bFirstBlock) {
+            bFirstBlock = FALSE;
+          }
+        }
+      }
+      FX_Free(pBuf);
+    }
+    m_Syntax.RestorePos(SavedPos + count * recordsize);
+  }
+  if (streampos)
+    if (!LoadCrossRefV5(streampos, streampos, FALSE)) {
+      return FALSE;
+    }
+  return TRUE;
+}
+FX_BOOL CPDF_Parser::LoadAllCrossRefV5(FX_FILESIZE xrefpos) {
+  if (!LoadCrossRefV5(xrefpos, xrefpos, TRUE)) {
+    return FALSE;
+  }
+  while (xrefpos)
+    if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
+      return FALSE;
+    }
+  m_ObjectStreamMap.InitHashTable(101, FALSE);
+  m_bXRefStream = TRUE;
+  return TRUE;
+}
+FX_BOOL CPDF_Parser::RebuildCrossRef() {
+  m_CrossRef.RemoveAll();
+  m_V5Type.RemoveAll();
+  m_SortedOffset.RemoveAll();
+  m_ObjVersion.RemoveAll();
+  if (m_pTrailer) {
+    m_pTrailer->Release();
+    m_pTrailer = NULL;
+  }
+  int32_t status = 0;
+  int32_t inside_index = 0;
+  FX_DWORD objnum = 0, gennum = 0;
+  int32_t depth = 0;
+  uint8_t* buffer = FX_Alloc(uint8_t, 4096);
+  FX_FILESIZE pos = m_Syntax.m_HeaderOffset;
+  FX_FILESIZE start_pos = 0, start_pos1 = 0;
+  FX_FILESIZE last_obj = -1, last_xref = -1, last_trailer = -1;
+  while (pos < m_Syntax.m_FileLen) {
+    FX_BOOL bOverFlow = FALSE;
+    FX_DWORD size = (FX_DWORD)(m_Syntax.m_FileLen - pos);
+    if (size > 4096) {
+      size = 4096;
+    }
+    if (!m_Syntax.m_pFileAccess->ReadBlock(buffer, pos, size)) {
+      break;
+    }
+    for (FX_DWORD i = 0; i < size; i++) {
+      uint8_t byte = buffer[i];
+      switch (status) {
+        case 0:
+          if (PDF_CharType[byte] == 'W') {
+            status = 1;
+          }
+          if (byte <= '9' && byte >= '0') {
+            --i;
+            status = 1;
+          }
+          if (byte == '%') {
+            inside_index = 0;
+            status = 9;
+          }
+          if (byte == '(') {
+            status = 10;
+            depth = 1;
+          }
+          if (byte == '<') {
+            inside_index = 1;
+            status = 11;
+          }
+          if (byte == '\\') {
+            status = 13;
+          }
+          if (byte == 't') {
+            status = 7;
+            inside_index = 1;
+          }
+          break;
+        case 1:
+          if (PDF_CharType[byte] == 'W') {
+            break;
+          } else if (byte <= '9' && byte >= '0') {
+            start_pos = pos + i;
+            status = 2;
+            objnum = byte - '0';
+          } else if (byte == 't') {
+            status = 7;
+            inside_index = 1;
+          } else if (byte == 'x') {
+            status = 8;
+            inside_index = 1;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 2:
+          if (byte <= '9' && byte >= '0') {
+            objnum = objnum * 10 + byte - '0';
+            break;
+          } else if (PDF_CharType[byte] == 'W') {
+            status = 3;
+          } else {
+            --i;
+            status = 14;
+            inside_index = 0;
+          }
+          break;
+        case 3:
+          if (byte <= '9' && byte >= '0') {
+            start_pos1 = pos + i;
+            status = 4;
+            gennum = byte - '0';
+          } else if (PDF_CharType[byte] == 'W') {
+            break;
+          } else if (byte == 't') {
+            status = 7;
+            inside_index = 1;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 4:
+          if (byte <= '9' && byte >= '0') {
+            gennum = gennum * 10 + byte - '0';
+            break;
+          } else if (PDF_CharType[byte] == 'W') {
+            status = 5;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 5:
+          if (byte == 'o') {
+            status = 6;
+            inside_index = 1;
+          } else if (PDF_CharType[byte] == 'W') {
+            break;
+          } else if (byte <= '9' && byte >= '0') {
+            objnum = gennum;
+            gennum = byte - '0';
+            start_pos = start_pos1;
+            start_pos1 = pos + i;
+            status = 4;
+          } else if (byte == 't') {
+            status = 7;
+            inside_index = 1;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 6:
+          switch (inside_index) {
+            case 1:
+              if (byte != 'b') {
+                --i;
+                status = 0;
+              } else {
+                inside_index++;
+              }
+              break;
+            case 2:
+              if (byte != 'j') {
+                --i;
+                status = 0;
+              } else {
+                inside_index++;
+              }
+              break;
+            case 3:
+              if (PDF_CharType[byte] == 'W' || PDF_CharType[byte] == 'D') {
+                if (objnum > 0x1000000) {
+                  status = 0;
+                  break;
+                }
+                FX_FILESIZE obj_pos = start_pos - m_Syntax.m_HeaderOffset;
+                last_obj = start_pos;
+                void* pResult =
+                    FXSYS_bsearch(&obj_pos, m_SortedOffset.GetData(),
+                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+                                  _CompareFileSize);
+                if (pResult == NULL) {
+                  m_SortedOffset.Add(obj_pos);
+                }
+                FX_FILESIZE obj_end = 0;
+                CPDF_Object* pObject = ParseIndirectObjectAtByStrict(
+                    m_pDocument, obj_pos, objnum, NULL, &obj_end);
+                if (pObject) {
+                  int iType = pObject->GetType();
+                  if (iType == PDFOBJ_STREAM) {
+                    CPDF_Stream* pStream = (CPDF_Stream*)pObject;
+                    CPDF_Dictionary* pDict = pStream->GetDict();
+                    if (pDict) {
+                      if (pDict->KeyExist(FX_BSTRC("Type"))) {
+                        CFX_ByteString bsValue =
+                            pDict->GetString(FX_BSTRC("Type"));
+                        if (bsValue == FX_BSTRC("XRef") &&
+                            pDict->KeyExist(FX_BSTRC("Size"))) {
+                          CPDF_Object* pRoot =
+                              pDict->GetElement(FX_BSTRC("Root"));
+                          if (pRoot && pRoot->GetDict() &&
+                              pRoot->GetDict()->GetElement(FX_BSTRC("Pages"))) {
+                            if (m_pTrailer) {
+                              m_pTrailer->Release();
+                            }
+                            m_pTrailer = (CPDF_Dictionary*)pDict->Clone();
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+                FX_FILESIZE offset = 0;
+                m_Syntax.RestorePos(obj_pos);
+                offset = m_Syntax.FindTag(FX_BSTRC("obj"), 0);
+                if (offset == -1) {
+                  offset = 0;
+                } else {
+                  offset += 3;
+                }
+                FX_FILESIZE nLen = obj_end - obj_pos - offset;
+                if ((FX_DWORD)nLen > size - i) {
+                  pos = obj_end + m_Syntax.m_HeaderOffset;
+                  bOverFlow = TRUE;
+                } else {
+                  i += (FX_DWORD)nLen;
+                }
+                if (m_CrossRef.GetSize() > (int32_t)objnum &&
+                    m_CrossRef[objnum]) {
+                  if (pObject) {
+                    FX_DWORD oldgen = m_ObjVersion.GetAt(objnum);
+                    m_CrossRef[objnum] = obj_pos;
+                    m_ObjVersion.SetAt(objnum, (int16_t)gennum);
+                    if (oldgen != gennum) {
+                      m_bVersionUpdated = TRUE;
+                    }
+                  }
+                } else {
+                  m_CrossRef.SetAtGrow(objnum, obj_pos);
+                  m_V5Type.SetAtGrow(objnum, 1);
+                  m_ObjVersion.SetAtGrow(objnum, (int16_t)gennum);
+                }
+                if (pObject) {
+                  pObject->Release();
+                }
+              }
+              --i;
+              status = 0;
+              break;
+          }
+          break;
+        case 7:
+          if (inside_index == 7) {
+            if (PDF_CharType[byte] == 'W' || PDF_CharType[byte] == 'D') {
+              last_trailer = pos + i - 7;
+              m_Syntax.RestorePos(pos + i - m_Syntax.m_HeaderOffset);
+              CPDF_Object* pObj = m_Syntax.GetObject(m_pDocument, 0, 0, 0);
+              if (pObj) {
+                if (pObj->GetType() != PDFOBJ_DICTIONARY &&
+                    pObj->GetType() != PDFOBJ_STREAM) {
+                  pObj->Release();
+                } else {
+                  CPDF_Dictionary* pTrailer = NULL;
+                  if (pObj->GetType() == PDFOBJ_STREAM) {
+                    pTrailer = ((CPDF_Stream*)pObj)->GetDict();
+                  } else {
+                    pTrailer = (CPDF_Dictionary*)pObj;
+                  }
+                  if (pTrailer) {
+                    if (m_pTrailer) {
+                      CPDF_Object* pRoot =
+                          pTrailer->GetElement(FX_BSTRC("Root"));
+                      if (pRoot == NULL ||
+                          (pRoot->GetType() == PDFOBJ_REFERENCE &&
+                           (FX_DWORD)m_CrossRef.GetSize() >
+                               ((CPDF_Reference*)pRoot)->GetRefObjNum() &&
+                           m_CrossRef.GetAt(((CPDF_Reference*)pRoot)
+                                                ->GetRefObjNum()) != 0)) {
+                        FX_POSITION pos = pTrailer->GetStartPos();
+                        while (pos) {
+                          CFX_ByteString key;
+                          CPDF_Object* pObj =
+                              pTrailer->GetNextElement(pos, key);
+                          m_pTrailer->SetAt(key, pObj->Clone(), m_pDocument);
+                        }
+                        pObj->Release();
+                      } else {
+                        pObj->Release();
+                      }
+                    } else {
+                      if (pObj->GetType() == PDFOBJ_STREAM) {
+                        m_pTrailer = (CPDF_Dictionary*)pTrailer->Clone();
+                        pObj->Release();
+                      } else {
+                        m_pTrailer = pTrailer;
+                      }
+                      FX_FILESIZE dwSavePos = m_Syntax.SavePos();
+                      CFX_ByteString strWord = m_Syntax.GetKeyword();
+                      if (!strWord.Compare(FX_BSTRC("startxref"))) {
+                        FX_BOOL bNumber = FALSE;
+                        CFX_ByteString bsOffset = m_Syntax.GetNextWord(bNumber);
+                        if (bNumber) {
+                          m_LastXRefOffset = FXSYS_atoi(bsOffset);
+                        }
+                      }
+                      m_Syntax.RestorePos(dwSavePos);
+                    }
+                  } else {
+                    pObj->Release();
+                  }
+                }
+              }
+            }
+            --i;
+            status = 0;
+          } else if (byte == "trailer"[inside_index]) {
+            inside_index++;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 8:
+          if (inside_index == 4) {
+            last_xref = pos + i - 4;
+            status = 1;
+          } else if (byte == "xref"[inside_index]) {
+            inside_index++;
+          } else {
+            --i;
+            status = 0;
+          }
+          break;
+        case 9:
+          if (byte == '\r' || byte == '\n') {
+            status = 0;
+          }
+          break;
+        case 10:
+          if (byte == ')') {
+            if (depth > 0) {
+              depth--;
+            }
+          } else if (byte == '(') {
+            depth++;
+          }
+          if (!depth) {
+            status = 0;
+          }
+          break;
+        case 11:
+          if (byte == '<' && inside_index == 1) {
+            status = 12;
+          } else if (byte == '>') {
+            status = 0;
+          }
+          inside_index = 0;
+          break;
+        case 12:
+          --i;
+          status = 0;
+          break;
+        case 13:
+          if (PDF_CharType[byte] == 'D' || PDF_CharType[byte] == 'W') {
+            --i;
+            status = 0;
+          }
+          break;
+        case 14:
+          if (PDF_CharType[byte] == 'W') {
+            status = 0;
+          } else if (byte == '%' || byte == '(' || byte == '<' ||
+                     byte == '\\') {
+            status = 0;
+            --i;
+          } else if (inside_index == 6) {
+            status = 0;
+            --i;
+          } else if (byte == "endobj"[inside_index]) {
+            inside_index++;
+          }
+          break;
+      }
+      if (bOverFlow) {
+        size = 0;
+        break;
+      }
+    }
+    pos += size;
+  }
+  if (last_xref != -1 && last_xref > last_obj) {
+    last_trailer = last_xref;
+  } else if (last_trailer == -1 || last_xref < last_obj) {
+    last_trailer = m_Syntax.m_FileLen;
+  }
+  FX_FILESIZE offset = last_trailer - m_Syntax.m_HeaderOffset;
+  void* pResult =
+      FXSYS_bsearch(&offset, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+                    sizeof(FX_FILESIZE), _CompareFileSize);
+  if (pResult == NULL) {
+    m_SortedOffset.Add(offset);
+  }
+  FX_Free(buffer);
+  return TRUE;
+}
+static FX_DWORD _GetVarInt(const uint8_t* p, int32_t n) {
+  FX_DWORD result = 0;
+  for (int32_t i = 0; i < n; i++) {
+    result = result * 256 + p[i];
+  }
+  return result;
+}
+FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE pos,
+                                    FX_FILESIZE& prev,
+                                    FX_BOOL bMainXRef) {
+  CPDF_Stream* pStream =
+      (CPDF_Stream*)ParseIndirectObjectAt(m_pDocument, pos, 0, NULL);
+  if (!pStream) {
+    return FALSE;
+  }
+  if (m_pDocument) {
+    CPDF_Dictionary* pDict = m_pDocument->GetRoot();
+    if (!pDict || pDict->GetObjNum() != pStream->m_ObjNum) {
+      m_pDocument->InsertIndirectObject(pStream->m_ObjNum, pStream);
+    } else {
+      if (pStream->GetType() == PDFOBJ_STREAM) {
+        pStream->Release();
+      }
+      return FALSE;
+    }
+  }
+  if (pStream->GetType() != PDFOBJ_STREAM) {
+    return FALSE;
+  }
+  prev = pStream->GetDict()->GetInteger(FX_BSTRC("Prev"));
+  int32_t size = pStream->GetDict()->GetInteger(FX_BSTRC("Size"));
+  if (size < 0) {
+    pStream->Release();
+    return FALSE;
+  }
+  if (bMainXRef) {
+    m_pTrailer = (CPDF_Dictionary*)pStream->GetDict()->Clone();
+    m_CrossRef.SetSize(size);
+    if (m_V5Type.SetSize(size)) {
+      FXSYS_memset(m_V5Type.GetData(), 0, size);
+    }
+  } else {
+    m_Trailers.Add((CPDF_Dictionary*)pStream->GetDict()->Clone());
+  }
+  std::vector<std::pair<int32_t, int32_t> > arrIndex;
+  CPDF_Array* pArray = pStream->GetDict()->GetArray(FX_BSTRC("Index"));
+  if (pArray) {
+    FX_DWORD nPairSize = pArray->GetCount() / 2;
+    for (FX_DWORD i = 0; i < nPairSize; i++) {
+      CPDF_Object* pStartNumObj = pArray->GetElement(i * 2);
+      CPDF_Object* pCountObj = pArray->GetElement(i * 2 + 1);
+      if (pStartNumObj && pStartNumObj->GetType() == PDFOBJ_NUMBER &&
+          pCountObj && pCountObj->GetType() == PDFOBJ_NUMBER) {
+        int nStartNum = pStartNumObj->GetInteger();
+        int nCount = pCountObj->GetInteger();
+        if (nStartNum >= 0 && nCount > 0) {
+          arrIndex.push_back(std::make_pair(nStartNum, nCount));
+        }
+      }
+    }
+  }
+  if (arrIndex.size() == 0) {
+    arrIndex.push_back(std::make_pair(0, size));
+  }
+  pArray = pStream->GetDict()->GetArray(FX_BSTRC("W"));
+  if (pArray == NULL) {
+    pStream->Release();
+    return FALSE;
+  }
+  CFX_DWordArray WidthArray;
+  FX_SAFE_DWORD dwAccWidth = 0;
+  for (FX_DWORD i = 0; i < pArray->GetCount(); i++) {
+    WidthArray.Add(pArray->GetInteger(i));
+    dwAccWidth += WidthArray[i];
+  }
+  if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3) {
+    pStream->Release();
+    return FALSE;
+  }
+  FX_DWORD totalWidth = dwAccWidth.ValueOrDie();
+  CPDF_StreamAcc acc;
+  acc.LoadAllData(pStream);
+  const uint8_t* pData = acc.GetData();
+  FX_DWORD dwTotalSize = acc.GetSize();
+  FX_DWORD segindex = 0;
+  for (FX_DWORD i = 0; i < arrIndex.size(); i++) {
+    int32_t startnum = arrIndex[i].first;
+    if (startnum < 0) {
+      continue;
+    }
+    m_dwXrefStartObjNum =
+        pdfium::base::checked_cast<FX_DWORD, int32_t>(startnum);
+    FX_DWORD count =
+        pdfium::base::checked_cast<FX_DWORD, int32_t>(arrIndex[i].second);
+    FX_SAFE_DWORD dwCaculatedSize = segindex;
+    dwCaculatedSize += count;
+    dwCaculatedSize *= totalWidth;
+    if (!dwCaculatedSize.IsValid() ||
+        dwCaculatedSize.ValueOrDie() > dwTotalSize) {
+      continue;
+    }
+    const uint8_t* segstart = pData + segindex * totalWidth;
+    FX_SAFE_DWORD dwMaxObjNum = startnum;
+    dwMaxObjNum += count;
+    FX_DWORD dwV5Size =
+        pdfium::base::checked_cast<FX_DWORD, int32_t>(m_V5Type.GetSize());
+    if (!dwMaxObjNum.IsValid() || dwMaxObjNum.ValueOrDie() > dwV5Size) {
+      continue;
+    }
+    for (FX_DWORD j = 0; j < count; j++) {
+      int32_t type = 1;
+      const uint8_t* entrystart = segstart + j * totalWidth;
+      if (WidthArray[0]) {
+        type = _GetVarInt(entrystart, WidthArray[0]);
+      }
+      if (m_V5Type[startnum + j] == 255) {
+        FX_FILESIZE offset =
+            _GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
+        m_CrossRef[startnum + j] = offset;
+        void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
+                                      m_SortedOffset.GetSize(),
+                                      sizeof(FX_FILESIZE), _CompareFileSize);
+        if (pResult == NULL) {
+          m_SortedOffset.Add(offset);
+        }
+        continue;
+      }
+      if (m_V5Type[startnum + j]) {
+        continue;
+      }
+      m_V5Type[startnum + j] = type;
+      if (type == 0) {
+        m_CrossRef[startnum + j] = 0;
+      } else {
+        FX_FILESIZE offset =
+            _GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
+        m_CrossRef[startnum + j] = offset;
+        if (type == 1) {
+          void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
+                                        m_SortedOffset.GetSize(),
+                                        sizeof(FX_FILESIZE), _CompareFileSize);
+          if (pResult == NULL) {
+            m_SortedOffset.Add(offset);
+          }
+        } else {
+          if (offset < 0 || offset >= m_V5Type.GetSize()) {
+            pStream->Release();
+            return FALSE;
+          }
+          m_V5Type[offset] = 255;
+        }
+      }
+    }
+    segindex += count;
+  }
+  pStream->Release();
+  return TRUE;
+}
+CPDF_Array* CPDF_Parser::GetIDArray() {
+  CPDF_Object* pID = m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("ID")) : NULL;
+  if (pID == NULL) {
+    return NULL;
+  }
+  if (pID->GetType() == PDFOBJ_REFERENCE) {
+    pID = ParseIndirectObject(NULL, ((CPDF_Reference*)pID)->GetRefObjNum());
+    m_pTrailer->SetAt(FX_BSTRC("ID"), pID);
+  }
+  if (pID == NULL || pID->GetType() != PDFOBJ_ARRAY) {
+    return NULL;
+  }
+  return (CPDF_Array*)pID;
+}
+FX_DWORD CPDF_Parser::GetRootObjNum() {
+  CPDF_Object* pRef =
+      m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("Root")) : NULL;
+  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
+    return 0;
+  }
+  return ((CPDF_Reference*)pRef)->GetRefObjNum();
+}
+FX_DWORD CPDF_Parser::GetInfoObjNum() {
+  CPDF_Object* pRef =
+      m_pTrailer ? m_pTrailer->GetElement(FX_BSTRC("Info")) : NULL;
+  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
+    return 0;
+  }
+  return ((CPDF_Reference*)pRef)->GetRefObjNum();
+}
+FX_BOOL CPDF_Parser::IsFormStream(FX_DWORD objnum, FX_BOOL& bForm) {
+  bForm = FALSE;
+  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
+    return TRUE;
+  }
+  if (m_V5Type[objnum] == 0) {
+    return TRUE;
+  }
+  if (m_V5Type[objnum] == 2) {
+    return TRUE;
+  }
+  FX_FILESIZE pos = m_CrossRef[objnum];
+  void* pResult =
+      FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+                    sizeof(FX_FILESIZE), _CompareFileSize);
+  if (pResult == NULL) {
+    return TRUE;
+  }
+  if ((FX_FILESIZE*)pResult - (FX_FILESIZE*)m_SortedOffset.GetData() ==
+      m_SortedOffset.GetSize() - 1) {
+    return FALSE;
+  }
+  FX_FILESIZE size = ((FX_FILESIZE*)pResult)[1] - pos;
+  FX_FILESIZE SavedPos = m_Syntax.SavePos();
+  m_Syntax.RestorePos(pos);
+  bForm = m_Syntax.SearchMultiWord(FX_BSTRC("/Form\0stream"), TRUE, size) == 0;
+  m_Syntax.RestorePos(SavedPos);
+  return TRUE;
+}
+CPDF_Object* CPDF_Parser::ParseIndirectObject(CPDF_IndirectObjects* pObjList,
+                                              FX_DWORD objnum,
+                                              PARSE_CONTEXT* pContext) {
+  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
+    return NULL;
+  }
+  if (m_V5Type[objnum] == 1 || m_V5Type[objnum] == 255) {
+    FX_FILESIZE pos = m_CrossRef[objnum];
+    if (pos <= 0) {
+      return NULL;
+    }
+    return ParseIndirectObjectAt(pObjList, pos, objnum, pContext);
+  }
+  if (m_V5Type[objnum] == 2) {
+    CPDF_StreamAcc* pObjStream = GetObjectStream((FX_DWORD)m_CrossRef[objnum]);
+    if (pObjStream == NULL) {
+      return NULL;
+    }
+    int32_t n = pObjStream->GetDict()->GetInteger(FX_BSTRC("N"));
+    int32_t offset = pObjStream->GetDict()->GetInteger(FX_BSTRC("First"));
+    CPDF_SyntaxParser syntax;
+    CFX_SmartPointer<IFX_FileStream> file(FX_CreateMemoryStream(
+        (uint8_t*)pObjStream->GetData(), (size_t)pObjStream->GetSize(), FALSE));
+    syntax.InitParser(file.Get(), 0);
+    CPDF_Object* pRet = NULL;
+    while (n) {
+      FX_DWORD thisnum = syntax.GetDirectNum();
+      FX_DWORD thisoff = syntax.GetDirectNum();
+      if (thisnum == objnum) {
+        syntax.RestorePos(offset + thisoff);
+        pRet = syntax.GetObject(pObjList, 0, 0, pContext);
+        break;
+      }
+      n--;
+    }
+    return pRet;
+  }
+  return NULL;
+}
+CPDF_StreamAcc* CPDF_Parser::GetObjectStream(FX_DWORD objnum) {
+  CPDF_StreamAcc* pStreamAcc = NULL;
+  if (m_ObjectStreamMap.Lookup((void*)(uintptr_t)objnum, (void*&)pStreamAcc)) {
+    return pStreamAcc;
+  }
+  const CPDF_Stream* pStream =
+      m_pDocument ? (CPDF_Stream*)m_pDocument->GetIndirectObject(objnum) : NULL;
+  if (pStream == NULL || pStream->GetType() != PDFOBJ_STREAM) {
+    return NULL;
+  }
+  pStreamAcc = new CPDF_StreamAcc;
+  pStreamAcc->LoadAllData(pStream);
+  m_ObjectStreamMap.SetAt((void*)(uintptr_t)objnum, pStreamAcc);
+  return pStreamAcc;
+}
+FX_FILESIZE CPDF_Parser::GetObjectSize(FX_DWORD objnum) {
+  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
+    return 0;
+  }
+  if (m_V5Type[objnum] == 2) {
+    objnum = (FX_DWORD)m_CrossRef[objnum];
+  }
+  if (m_V5Type[objnum] == 1 || m_V5Type[objnum] == 255) {
+    FX_FILESIZE offset = m_CrossRef[objnum];
+    if (offset == 0) {
+      return 0;
+    }
+    void* pResult = FXSYS_bsearch(&offset, m_SortedOffset.GetData(),
+                                  m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+                                  _CompareFileSize);
+    if (pResult == NULL) {
+      return 0;
+    }
+    if ((FX_FILESIZE*)pResult - (FX_FILESIZE*)m_SortedOffset.GetData() ==
+        m_SortedOffset.GetSize() - 1) {
+      return 0;
+    }
+    return ((FX_FILESIZE*)pResult)[1] - offset;
+  }
+  return 0;
+}
+void CPDF_Parser::GetIndirectBinary(FX_DWORD objnum,
+                                    uint8_t*& pBuffer,
+                                    FX_DWORD& size) {
+  pBuffer = NULL;
+  size = 0;
+  if (objnum >= (FX_DWORD)m_CrossRef.GetSize()) {
+    return;
+  }
+  if (m_V5Type[objnum] == 2) {
+    CPDF_StreamAcc* pObjStream = GetObjectStream((FX_DWORD)m_CrossRef[objnum]);
+    if (pObjStream == NULL) {
+      return;
+    }
+    int32_t n = pObjStream->GetDict()->GetInteger(FX_BSTRC("N"));
+    int32_t offset = pObjStream->GetDict()->GetInteger(FX_BSTRC("First"));
+    CPDF_SyntaxParser syntax;
+    const uint8_t* pData = pObjStream->GetData();
+    FX_DWORD totalsize = pObjStream->GetSize();
+    CFX_SmartPointer<IFX_FileStream> file(
+        FX_CreateMemoryStream((uint8_t*)pData, (size_t)totalsize, FALSE));
+    syntax.InitParser(file.Get(), 0);
+    while (n) {
+      FX_DWORD thisnum = syntax.GetDirectNum();
+      FX_DWORD thisoff = syntax.GetDirectNum();
+      if (thisnum == objnum) {
+        if (n == 1) {
+          size = totalsize - (thisoff + offset);
+        } else {
+          syntax.GetDirectNum();  // Skip nextnum.
+          FX_DWORD nextoff = syntax.GetDirectNum();
+          size = nextoff - thisoff;
+        }
+        pBuffer = FX_Alloc(uint8_t, size);
+        FXSYS_memcpy(pBuffer, pData + thisoff + offset, size);
+        return;
+      }
+      n--;
+    }
+    return;
+  }
+  if (m_V5Type[objnum] == 1) {
+    FX_FILESIZE pos = m_CrossRef[objnum];
+    if (pos == 0) {
+      return;
+    }
+    FX_FILESIZE SavedPos = m_Syntax.SavePos();
+    m_Syntax.RestorePos(pos);
+    FX_BOOL bIsNumber;
+    CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
+    if (!bIsNumber) {
+      m_Syntax.RestorePos(SavedPos);
+      return;
+    }
+    FX_DWORD parser_objnum = FXSYS_atoi(word);
+    if (parser_objnum && parser_objnum != objnum) {
+      m_Syntax.RestorePos(SavedPos);
+      return;
+    }
+    word = m_Syntax.GetNextWord(bIsNumber);
+    if (!bIsNumber) {
+      m_Syntax.RestorePos(SavedPos);
+      return;
+    }
+    if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
+      m_Syntax.RestorePos(SavedPos);
+      return;
+    }
+    void* pResult =
+        FXSYS_bsearch(&pos, m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+                      sizeof(FX_FILESIZE), _CompareFileSize);
+    if (pResult == NULL) {
+      m_Syntax.RestorePos(SavedPos);
+      return;
+    }
+    FX_FILESIZE nextoff = ((FX_FILESIZE*)pResult)[1];
+    FX_BOOL bNextOffValid = FALSE;
+    if (nextoff != pos) {
+      m_Syntax.RestorePos(nextoff);
+      word = m_Syntax.GetNextWord(bIsNumber);
+      if (word == FX_BSTRC("xref")) {
+        bNextOffValid = TRUE;
+      } else if (bIsNumber) {
+        word = m_Syntax.GetNextWord(bIsNumber);
+        if (bIsNumber && m_Syntax.GetKeyword() == FX_BSTRC("obj")) {
+          bNextOffValid = TRUE;
+        }
+      }
+    }
+    if (!bNextOffValid) {
+      m_Syntax.RestorePos(pos);
+      while (1) {
+        if (m_Syntax.GetKeyword() == FX_BSTRC("endobj")) {
+          break;
+        }
+        if (m_Syntax.SavePos() == m_Syntax.m_FileLen) {
+          break;
+        }
+      }
+      nextoff = m_Syntax.SavePos();
+    }
+    size = (FX_DWORD)(nextoff - pos);
+    pBuffer = FX_Alloc(uint8_t, size);
+    m_Syntax.RestorePos(pos);
+    m_Syntax.ReadBlock(pBuffer, size);
+    m_Syntax.RestorePos(SavedPos);
+  }
+}
+CPDF_Object* CPDF_Parser::ParseIndirectObjectAt(CPDF_IndirectObjects* pObjList,
+                                                FX_FILESIZE pos,
+                                                FX_DWORD objnum,
+                                                PARSE_CONTEXT* pContext) {
+  FX_FILESIZE SavedPos = m_Syntax.SavePos();
+  m_Syntax.RestorePos(pos);
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  FX_FILESIZE objOffset = m_Syntax.SavePos();
+  objOffset -= word.GetLength();
+  FX_DWORD parser_objnum = FXSYS_atoi(word);
+  if (objnum && parser_objnum != objnum) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  FX_DWORD parser_gennum = FXSYS_atoi(word);
+  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  CPDF_Object* pObj =
+      m_Syntax.GetObject(pObjList, objnum, parser_gennum, pContext);
+  m_Syntax.SavePos();
+  CFX_ByteString bsWord = m_Syntax.GetKeyword();
+  if (bsWord == FX_BSTRC("endobj")) {
+    m_Syntax.SavePos();
+  }
+  m_Syntax.RestorePos(SavedPos);
+  if (pObj) {
+    if (!objnum) {
+      pObj->m_ObjNum = parser_objnum;
+    }
+    pObj->m_GenNum = parser_gennum;
+  }
+  return pObj;
+}
+CPDF_Object* CPDF_Parser::ParseIndirectObjectAtByStrict(
+    CPDF_IndirectObjects* pObjList,
+    FX_FILESIZE pos,
+    FX_DWORD objnum,
+    struct PARSE_CONTEXT* pContext,
+    FX_FILESIZE* pResultPos) {
+  FX_FILESIZE SavedPos = m_Syntax.SavePos();
+  m_Syntax.RestorePos(pos);
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  FX_DWORD parser_objnum = FXSYS_atoi(word);
+  if (objnum && parser_objnum != objnum) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  FX_DWORD gennum = FXSYS_atoi(word);
+  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
+    m_Syntax.RestorePos(SavedPos);
+    return NULL;
+  }
+  CPDF_Object* pObj =
+      m_Syntax.GetObjectByStrict(pObjList, objnum, gennum, pContext);
+  if (pResultPos) {
+    *pResultPos = m_Syntax.m_Pos;
+  }
+  m_Syntax.RestorePos(SavedPos);
+  return pObj;
+}
+CPDF_Dictionary* CPDF_Parser::LoadTrailerV4() {
+  if (m_Syntax.GetKeyword() != FX_BSTRC("trailer")) {
+    return NULL;
+  }
+  CPDF_Object* pObj = m_Syntax.GetObject(m_pDocument, 0, 0, 0);
+  if (pObj == NULL || pObj->GetType() != PDFOBJ_DICTIONARY) {
+    if (pObj) {
+      pObj->Release();
+    }
+    return NULL;
+  }
+  return (CPDF_Dictionary*)pObj;
+}
+FX_DWORD CPDF_Parser::GetPermissions(FX_BOOL bCheckRevision) {
+  if (m_pSecurityHandler == NULL) {
+    return (FX_DWORD)-1;
+  }
+  FX_DWORD dwPermission = m_pSecurityHandler->GetPermissions();
+  if (m_pEncryptDict &&
+      m_pEncryptDict->GetString(FX_BSTRC("Filter")) == FX_BSTRC("Standard")) {
+    dwPermission &= 0xFFFFFFFC;
+    dwPermission |= 0xFFFFF0C0;
+    if (bCheckRevision && m_pEncryptDict->GetInteger(FX_BSTRC("R")) == 2) {
+      dwPermission &= 0xFFFFF0FF;
+    }
+  }
+  return dwPermission;
+}
+FX_BOOL CPDF_Parser::IsOwner() {
+  return m_pSecurityHandler == NULL ? TRUE : m_pSecurityHandler->IsOwner();
+}
+void CPDF_Parser::SetSecurityHandler(CPDF_SecurityHandler* pSecurityHandler,
+                                     FX_BOOL bForced) {
+  ASSERT(m_pSecurityHandler == NULL);
+  if (!m_bForceUseSecurityHandler) {
+    delete m_pSecurityHandler;
+    m_pSecurityHandler = NULL;
+  }
+  m_bForceUseSecurityHandler = bForced;
+  m_pSecurityHandler = pSecurityHandler;
+  if (m_bForceUseSecurityHandler) {
+    return;
+  }
+  m_Syntax.m_pCryptoHandler = pSecurityHandler->CreateCryptoHandler();
+  m_Syntax.m_pCryptoHandler->Init(NULL, pSecurityHandler);
+}
+FX_BOOL CPDF_Parser::IsLinearizedFile(IFX_FileRead* pFileAccess,
+                                      FX_DWORD offset) {
+  m_Syntax.InitParser(pFileAccess, offset);
+  m_Syntax.RestorePos(m_Syntax.m_HeaderOffset + 9);
+  FX_FILESIZE SavedPos = m_Syntax.SavePos();
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    return FALSE;
+  }
+  FX_DWORD objnum = FXSYS_atoi(word);
+  word = m_Syntax.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    return FALSE;
+  }
+  FX_DWORD gennum = FXSYS_atoi(word);
+  if (m_Syntax.GetKeyword() != FX_BSTRC("obj")) {
+    m_Syntax.RestorePos(SavedPos);
+    return FALSE;
+  }
+  m_pLinearized = m_Syntax.GetObject(NULL, objnum, gennum, 0);
+  if (!m_pLinearized) {
+    return FALSE;
+  }
+  if (m_pLinearized->GetDict() &&
+      m_pLinearized->GetDict()->GetElement(FX_BSTRC("Linearized"))) {
+    m_Syntax.GetNextWord(bIsNumber);
+    CPDF_Object* pLen = m_pLinearized->GetDict()->GetElement(FX_BSTRC("L"));
+    if (!pLen) {
+      m_pLinearized->Release();
+      m_pLinearized = NULL;
+      return FALSE;
+    }
+    if (pLen->GetInteger() != (int)pFileAccess->GetSize()) {
+      return FALSE;
+    }
+    CPDF_Object* pNo = m_pLinearized->GetDict()->GetElement(FX_BSTRC("P"));
+    if (pNo && pNo->GetType() == PDFOBJ_NUMBER) {
+      m_dwFirstPageNo = pNo->GetInteger();
+    }
+    CPDF_Object* pTable = m_pLinearized->GetDict()->GetElement(FX_BSTRC("T"));
+    if (pTable && pTable->GetType() == PDFOBJ_NUMBER) {
+      m_LastXRefOffset = pTable->GetInteger();
+    }
+    return TRUE;
+  }
+  m_pLinearized->Release();
+  m_pLinearized = NULL;
+  return FALSE;
+}
+FX_DWORD CPDF_Parser::StartAsynParse(IFX_FileRead* pFileAccess,
+                                     FX_BOOL bReParse,
+                                     FX_BOOL bOwnFileRead) {
+  CloseParser(bReParse);
+  m_bXRefStream = FALSE;
+  m_LastXRefOffset = 0;
+  m_bOwnFileRead = bOwnFileRead;
+  int32_t offset = GetHeaderOffset(pFileAccess);
+  if (offset == -1) {
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  if (!IsLinearizedFile(pFileAccess, offset)) {
+    m_Syntax.m_pFileAccess = NULL;
+    return StartParse(pFileAccess, bReParse, bOwnFileRead);
+  }
+  if (!bReParse) {
+    m_pDocument = new CPDF_Document(this);
+  }
+  FX_FILESIZE dwFirstXRefOffset = m_Syntax.SavePos();
+  FX_BOOL bXRefRebuilt = FALSE;
+  FX_BOOL bLoadV4 = FALSE;
+  if (!(bLoadV4 = LoadCrossRefV4(dwFirstXRefOffset, 0, FALSE, FALSE)) &&
+      !LoadCrossRefV5(dwFirstXRefOffset, dwFirstXRefOffset, TRUE)) {
+    if (!RebuildCrossRef()) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    bXRefRebuilt = TRUE;
+    m_LastXRefOffset = 0;
+  }
+  if (bLoadV4) {
+    m_pTrailer = LoadTrailerV4();
+    if (m_pTrailer == NULL) {
+      return FALSE;
+    }
+    int32_t xrefsize = GetDirectInteger(m_pTrailer, FX_BSTRC("Size"));
+    if (xrefsize > 0) {
+      m_CrossRef.SetSize(xrefsize);
+      m_V5Type.SetSize(xrefsize);
+    }
+  }
+  FX_DWORD dwRet = SetEncryptHandler();
+  if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+    return dwRet;
+  }
+  m_pDocument->LoadAsynDoc(m_pLinearized->GetDict());
+  if (m_pDocument->GetRoot() == NULL || m_pDocument->GetPageCount() == 0) {
+    if (bXRefRebuilt) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    ReleaseEncryptHandler();
+    if (!RebuildCrossRef()) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    dwRet = SetEncryptHandler();
+    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+      return dwRet;
+    }
+    m_pDocument->LoadAsynDoc(m_pLinearized->GetDict());
+    if (m_pDocument->GetRoot() == NULL) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+  }
+  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+              sizeof(FX_FILESIZE), _CompareFileSize);
+  FX_DWORD RootObjNum = GetRootObjNum();
+  if (RootObjNum == 0) {
+    ReleaseEncryptHandler();
+    RebuildCrossRef();
+    RootObjNum = GetRootObjNum();
+    if (RootObjNum == 0) {
+      return PDFPARSE_ERROR_FORMAT;
+    }
+    dwRet = SetEncryptHandler();
+    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+      return dwRet;
+    }
+  }
+  if (m_pSecurityHandler && m_pSecurityHandler->IsMetadataEncrypted()) {
+    CPDF_Object* pMetadata =
+        m_pDocument->GetRoot()->GetElement(FX_BSTRC("Metadata"));
+    if (pMetadata && pMetadata->GetType() == PDFOBJ_REFERENCE) {
+      m_Syntax.m_MetadataObjnum = ((CPDF_Reference*)pMetadata)->GetRefObjNum();
+    }
+  }
+  return PDFPARSE_ERROR_SUCCESS;
+}
+FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV5(FX_FILESIZE xrefpos) {
+  if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
+    return FALSE;
+  }
+  while (xrefpos)
+    if (!LoadCrossRefV5(xrefpos, xrefpos, FALSE)) {
+      return FALSE;
+    }
+  m_ObjectStreamMap.InitHashTable(101, FALSE);
+  m_bXRefStream = TRUE;
+  return TRUE;
+}
+FX_DWORD CPDF_Parser::LoadLinearizedMainXRefTable() {
+  FX_DWORD dwSaveMetadataObjnum = m_Syntax.m_MetadataObjnum;
+  m_Syntax.m_MetadataObjnum = 0;
+  if (m_pTrailer) {
+    m_pTrailer->Release();
+    m_pTrailer = NULL;
+  }
+  m_Syntax.RestorePos(m_LastXRefOffset - m_Syntax.m_HeaderOffset);
+  uint8_t ch = 0;
+  FX_DWORD dwCount = 0;
+  m_Syntax.GetNextChar(ch);
+  int32_t type = PDF_CharType[ch];
+  while (type == 'W') {
+    ++dwCount;
+    if (m_Syntax.m_FileLen >=
+        (FX_FILESIZE)(m_Syntax.SavePos() + m_Syntax.m_HeaderOffset)) {
+      break;
+    }
+    m_Syntax.GetNextChar(ch);
+    type = PDF_CharType[ch];
+  }
+  m_LastXRefOffset += dwCount;
+  FX_POSITION pos = m_ObjectStreamMap.GetStartPosition();
+  while (pos) {
+    void* objnum;
+    CPDF_StreamAcc* pStream;
+    m_ObjectStreamMap.GetNextAssoc(pos, objnum, (void*&)pStream);
+    delete pStream;
+  }
+  m_ObjectStreamMap.RemoveAll();
+  if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
+      !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
+    m_LastXRefOffset = 0;
+    m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
+    return PDFPARSE_ERROR_FORMAT;
+  }
+  FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(),
+              sizeof(FX_FILESIZE), _CompareFileSize);
+  m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
+  return PDFPARSE_ERROR_SUCCESS;
+}
+
+// static
+int CPDF_SyntaxParser::s_CurrentRecursionDepth = 0;
+
+CPDF_SyntaxParser::CPDF_SyntaxParser() {
+  m_pFileAccess = NULL;
+  m_pCryptoHandler = NULL;
+  m_pFileBuf = NULL;
+  m_BufSize = CPDF_ModuleMgr::kFileBufSize;
+  m_pFileBuf = NULL;
+  m_MetadataObjnum = 0;
+  m_dwWordPos = 0;
+  m_bFileStream = FALSE;
+}
+CPDF_SyntaxParser::~CPDF_SyntaxParser() {
+  FX_Free(m_pFileBuf);
+}
+FX_BOOL CPDF_SyntaxParser::GetCharAt(FX_FILESIZE pos, uint8_t& ch) {
+  FX_FILESIZE save_pos = m_Pos;
+  m_Pos = pos;
+  FX_BOOL ret = GetNextChar(ch);
+  m_Pos = save_pos;
+  return ret;
+}
+FX_BOOL CPDF_SyntaxParser::GetNextChar(uint8_t& ch) {
+  FX_FILESIZE pos = m_Pos + m_HeaderOffset;
+  if (pos >= m_FileLen) {
+    return FALSE;
+  }
+  if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
+    FX_FILESIZE read_pos = pos;
+    FX_DWORD read_size = m_BufSize;
+    if ((FX_FILESIZE)read_size > m_FileLen) {
+      read_size = (FX_DWORD)m_FileLen;
+    }
+    if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
+      if (m_FileLen < (FX_FILESIZE)read_size) {
+        read_pos = 0;
+        read_size = (FX_DWORD)m_FileLen;
+      } else {
+        read_pos = m_FileLen - read_size;
+      }
+    }
+    if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) {
+      return FALSE;
+    }
+    m_BufOffset = read_pos;
+  }
+  ch = m_pFileBuf[pos - m_BufOffset];
+  m_Pos++;
+  return TRUE;
+}
+FX_BOOL CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch) {
+  pos += m_HeaderOffset;
+  if (pos >= m_FileLen) {
+    return FALSE;
+  }
+  if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
+    FX_FILESIZE read_pos;
+    if (pos < (FX_FILESIZE)m_BufSize) {
+      read_pos = 0;
+    } else {
+      read_pos = pos - m_BufSize + 1;
+    }
+    FX_DWORD read_size = m_BufSize;
+    if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
+      if (m_FileLen < (FX_FILESIZE)read_size) {
+        read_pos = 0;
+        read_size = (FX_DWORD)m_FileLen;
+      } else {
+        read_pos = m_FileLen - read_size;
+      }
+    }
+    if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) {
+      return FALSE;
+    }
+    m_BufOffset = read_pos;
+  }
+  ch = m_pFileBuf[pos - m_BufOffset];
+  return TRUE;
+}
+FX_BOOL CPDF_SyntaxParser::ReadBlock(uint8_t* pBuf, FX_DWORD size) {
+  if (!m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size)) {
+    return FALSE;
+  }
+  m_Pos += size;
+  return TRUE;
+}
+#define MAX_WORD_BUFFER 256
+void CPDF_SyntaxParser::GetNextWord() {
+  m_WordSize = 0;
+  m_bIsNumber = TRUE;
+  uint8_t ch;
+  if (!GetNextChar(ch)) {
+    return;
+  }
+  uint8_t type = PDF_CharType[ch];
+  while (1) {
+    while (type == 'W') {
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      type = PDF_CharType[ch];
+    }
+    if (ch != '%') {
+      break;
+    }
+    while (1) {
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      if (ch == '\r' || ch == '\n') {
+        break;
+      }
+    }
+    type = PDF_CharType[ch];
+  }
+  if (type == 'D') {
+    m_bIsNumber = FALSE;
+    m_WordBuffer[m_WordSize++] = ch;
+    if (ch == '/') {
+      while (1) {
+        if (!GetNextChar(ch)) {
+          return;
+        }
+        type = PDF_CharType[ch];
+        if (type != 'R' && type != 'N') {
+          m_Pos--;
+          return;
+        }
+        if (m_WordSize < MAX_WORD_BUFFER) {
+          m_WordBuffer[m_WordSize++] = ch;
+        }
+      }
+    } else if (ch == '<') {
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      if (ch == '<') {
+        m_WordBuffer[m_WordSize++] = ch;
+      } else {
+        m_Pos--;
+      }
+    } else if (ch == '>') {
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      if (ch == '>') {
+        m_WordBuffer[m_WordSize++] = ch;
+      } else {
+        m_Pos--;
+      }
+    }
+    return;
+  }
+  while (1) {
+    if (m_WordSize < MAX_WORD_BUFFER) {
+      m_WordBuffer[m_WordSize++] = ch;
+    }
+    if (type != 'N') {
+      m_bIsNumber = FALSE;
+    }
+    if (!GetNextChar(ch)) {
+      return;
+    }
+    type = PDF_CharType[ch];
+    if (type == 'D' || type == 'W') {
+      m_Pos--;
+      break;
+    }
+  }
+}
+CFX_ByteString CPDF_SyntaxParser::ReadString() {
+  uint8_t ch;
+  if (!GetNextChar(ch)) {
+    return CFX_ByteString();
+  }
+  CFX_ByteTextBuf buf;
+  int32_t parlevel = 0;
+  int32_t status = 0, iEscCode = 0;
+  while (1) {
+    switch (status) {
+      case 0:
+        if (ch == ')') {
+          if (parlevel == 0) {
+            return buf.GetByteString();
+          }
+          parlevel--;
+          buf.AppendChar(')');
+        } else if (ch == '(') {
+          parlevel++;
+          buf.AppendChar('(');
+        } else if (ch == '\\') {
+          status = 1;
+        } else {
+          buf.AppendChar(ch);
+        }
+        break;
+      case 1:
+        if (ch >= '0' && ch <= '7') {
+          iEscCode = ch - '0';
+          status = 2;
+          break;
+        }
+        if (ch == 'n') {
+          buf.AppendChar('\n');
+        } else if (ch == 'r') {
+          buf.AppendChar('\r');
+        } else if (ch == 't') {
+          buf.AppendChar('\t');
+        } else if (ch == 'b') {
+          buf.AppendChar('\b');
+        } else if (ch == 'f') {
+          buf.AppendChar('\f');
+        } else if (ch == '\r') {
+          status = 4;
+          break;
+        } else if (ch == '\n') {
+        } else {
+          buf.AppendChar(ch);
+        }
+        status = 0;
+        break;
+      case 2:
+        if (ch >= '0' && ch <= '7') {
+          iEscCode = iEscCode * 8 + ch - '0';
+          status = 3;
+        } else {
+          buf.AppendChar(iEscCode);
+          status = 0;
+          continue;
+        }
+        break;
+      case 3:
+        if (ch >= '0' && ch <= '7') {
+          iEscCode = iEscCode * 8 + ch - '0';
+          buf.AppendChar(iEscCode);
+          status = 0;
+        } else {
+          buf.AppendChar(iEscCode);
+          status = 0;
+          continue;
+        }
+        break;
+      case 4:
+        status = 0;
+        if (ch != '\n') {
+          continue;
+        }
+        break;
+    }
+    if (!GetNextChar(ch)) {
+      break;
+    }
+  }
+  GetNextChar(ch);
+  return buf.GetByteString();
+}
+CFX_ByteString CPDF_SyntaxParser::ReadHexString() {
+  uint8_t ch;
+  if (!GetNextChar(ch)) {
+    return CFX_ByteString();
+  }
+  CFX_BinaryBuf buf;
+  FX_BOOL bFirst = TRUE;
+  uint8_t code = 0;
+  while (1) {
+    if (ch == '>') {
+      break;
+    }
+    if (ch >= '0' && ch <= '9') {
+      if (bFirst) {
+        code = (ch - '0') * 16;
+      } else {
+        code += ch - '0';
+        buf.AppendByte((uint8_t)code);
+      }
+      bFirst = !bFirst;
+    } else if (ch >= 'A' && ch <= 'F') {
+      if (bFirst) {
+        code = (ch - 'A' + 10) * 16;
+      } else {
+        code += ch - 'A' + 10;
+        buf.AppendByte((uint8_t)code);
+      }
+      bFirst = !bFirst;
+    } else if (ch >= 'a' && ch <= 'f') {
+      if (bFirst) {
+        code = (ch - 'a' + 10) * 16;
+      } else {
+        code += ch - 'a' + 10;
+        buf.AppendByte((uint8_t)code);
+      }
+      bFirst = !bFirst;
+    }
+    if (!GetNextChar(ch)) {
+      break;
+    }
+  }
+  if (!bFirst) {
+    buf.AppendByte((uint8_t)code);
+  }
+  return buf.GetByteString();
+}
+void CPDF_SyntaxParser::ToNextLine() {
+  uint8_t ch;
+  while (GetNextChar(ch)) {
+    if (ch == '\n') {
+      break;
+    }
+    if (ch == '\r') {
+      GetNextChar(ch);
+      if (ch != '\n') {
+        --m_Pos;
+      }
+      break;
+    }
+  }
+}
+void CPDF_SyntaxParser::ToNextWord() {
+  uint8_t ch;
+  if (!GetNextChar(ch)) {
+    return;
+  }
+  uint8_t type = PDF_CharType[ch];
+  while (1) {
+    while (type == 'W') {
+      m_dwWordPos = m_Pos;
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      type = PDF_CharType[ch];
+    }
+    if (ch != '%') {
+      break;
+    }
+    while (1) {
+      if (!GetNextChar(ch)) {
+        return;
+      }
+      if (ch == '\r' || ch == '\n') {
+        break;
+      }
+    }
+    type = PDF_CharType[ch];
+  }
+  m_Pos--;
+}
+CFX_ByteString CPDF_SyntaxParser::GetNextWord(FX_BOOL& bIsNumber) {
+  GetNextWord();
+  bIsNumber = m_bIsNumber;
+  return CFX_ByteString((const FX_CHAR*)m_WordBuffer, m_WordSize);
+}
+CFX_ByteString CPDF_SyntaxParser::GetKeyword() {
+  GetNextWord();
+  return CFX_ByteString((const FX_CHAR*)m_WordBuffer, m_WordSize);
+}
+CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjects* pObjList,
+                                          FX_DWORD objnum,
+                                          FX_DWORD gennum,
+                                          PARSE_CONTEXT* pContext,
+                                          FX_BOOL bDecrypt) {
+  CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
+  if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) {
+    return NULL;
+  }
+  FX_FILESIZE SavedPos = m_Pos;
+  FX_BOOL bTypeOnly = pContext && (pContext->m_Flags & PDFPARSE_TYPEONLY);
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = GetNextWord(bIsNumber);
+  if (word.GetLength() == 0) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_INVALID;
+    }
+    return NULL;
+  }
+  if (bIsNumber) {
+    FX_FILESIZE SavedPos = m_Pos;
+    CFX_ByteString nextword = GetNextWord(bIsNumber);
+    if (bIsNumber) {
+      CFX_ByteString nextword2 = GetNextWord(bIsNumber);
+      if (nextword2 == FX_BSTRC("R")) {
+        FX_DWORD objnum = FXSYS_atoi(word);
+        if (bTypeOnly) {
+          return (CPDF_Object*)PDFOBJ_REFERENCE;
+        }
+        return new CPDF_Reference(pObjList, objnum);
+      }
+    }
+    m_Pos = SavedPos;
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NUMBER;
+    }
+    return CPDF_Number::Create(word);
+  }
+  if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_BOOLEAN;
+    }
+    return CPDF_Boolean::Create(word == FX_BSTRC("true"));
+  }
+  if (word == FX_BSTRC("null")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NULL;
+    }
+    return CPDF_Null::Create();
+  }
+  if (word == FX_BSTRC("(")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_STRING;
+    }
+    CFX_ByteString str = ReadString();
+    if (m_pCryptoHandler && bDecrypt) {
+      m_pCryptoHandler->Decrypt(objnum, gennum, str);
+    }
+    return CPDF_String::Create(str, FALSE);
+  }
+  if (word == FX_BSTRC("<")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_STRING;
+    }
+    CFX_ByteString str = ReadHexString();
+    if (m_pCryptoHandler && bDecrypt) {
+      m_pCryptoHandler->Decrypt(objnum, gennum, str);
+    }
+    return CPDF_String::Create(str, TRUE);
+  }
+  if (word == FX_BSTRC("[")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_ARRAY;
+    }
+    CPDF_Array* pArray = CPDF_Array::Create();
+    while (1) {
+      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
+      if (pObj == NULL) {
+        return pArray;
+      }
+      pArray->Add(pObj);
+    }
+  }
+  if (word[0] == '/') {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NAME;
+    }
+    return CPDF_Name::Create(
+        PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1)));
+  }
+  if (word == FX_BSTRC("<<")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_DICTIONARY;
+    }
+    if (pContext) {
+      pContext->m_DictStart = SavedPos;
+    }
+    CPDF_Dictionary* pDict = CPDF_Dictionary::Create();
+    int32_t nKeys = 0;
+    FX_FILESIZE dwSignValuePos = 0;
+    while (1) {
+      FX_BOOL bIsNumber;
+      CFX_ByteString key = GetNextWord(bIsNumber);
+      if (key.IsEmpty()) {
+        if (pDict)
+          pDict->Release();
+        return NULL;
+      }
+      FX_FILESIZE SavedPos = m_Pos - key.GetLength();
+      if (key == FX_BSTRC(">>")) {
+        break;
+      }
+      if (key == FX_BSTRC("endobj")) {
+        m_Pos = SavedPos;
+        break;
+      }
+      if (key[0] != '/') {
+        continue;
+      }
+      nKeys++;
+      key = PDF_NameDecode(key);
+      if (key == FX_BSTRC("/Contents")) {
+        dwSignValuePos = m_Pos;
+      }
+      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
+      if (pObj == NULL) {
+        continue;
+      }
+      if (key.GetLength() >= 1) {
+        if (nKeys < 32) {
+          pDict->SetAt(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
+                       pObj);
+        } else {
+          pDict->AddValue(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
+                          pObj);
+        }
+      }
+    }
+    if (IsSignatureDict(pDict)) {
+      FX_FILESIZE dwSavePos = m_Pos;
+      m_Pos = dwSignValuePos;
+      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum, NULL, FALSE);
+      pDict->SetAt(FX_BSTRC("Contents"), pObj);
+      m_Pos = dwSavePos;
+    }
+    if (pContext) {
+      pContext->m_DictEnd = m_Pos;
+      if (pContext->m_Flags & PDFPARSE_NOSTREAM) {
+        return pDict;
+      }
+    }
+    FX_FILESIZE SavedPos = m_Pos;
+    FX_BOOL bIsNumber;
+    CFX_ByteString nextword = GetNextWord(bIsNumber);
+    if (nextword == FX_BSTRC("stream")) {
+      CPDF_Stream* pStream = ReadStream(pDict, pContext, objnum, gennum);
+      if (pStream) {
+        return pStream;
+      }
+      if (pDict)
+        pDict->Release();
+      return NULL;
+    } else {
+      m_Pos = SavedPos;
+      return pDict;
+    }
+  }
+  if (word == FX_BSTRC(">>")) {
+    m_Pos = SavedPos;
+    return NULL;
+  }
+  if (bTypeOnly) {
+    return (CPDF_Object*)PDFOBJ_INVALID;
+  }
+  return NULL;
+}
+CPDF_Object* CPDF_SyntaxParser::GetObjectByStrict(
+    CPDF_IndirectObjects* pObjList,
+    FX_DWORD objnum,
+    FX_DWORD gennum,
+    struct PARSE_CONTEXT* pContext) {
+  CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
+  if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) {
+    return NULL;
+  }
+  FX_FILESIZE SavedPos = m_Pos;
+  FX_BOOL bTypeOnly = pContext && (pContext->m_Flags & PDFPARSE_TYPEONLY);
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = GetNextWord(bIsNumber);
+  if (word.GetLength() == 0) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_INVALID;
+    }
+    return NULL;
+  }
+  if (bIsNumber) {
+    FX_FILESIZE SavedPos = m_Pos;
+    CFX_ByteString nextword = GetNextWord(bIsNumber);
+    if (bIsNumber) {
+      CFX_ByteString nextword2 = GetNextWord(bIsNumber);
+      if (nextword2 == FX_BSTRC("R")) {
+        if (bTypeOnly) {
+          return (CPDF_Object*)PDFOBJ_REFERENCE;
+        }
+        FX_DWORD objnum = FXSYS_atoi(word);
+        return new CPDF_Reference(pObjList, objnum);
+      }
+    }
+    m_Pos = SavedPos;
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NUMBER;
+    }
+    return CPDF_Number::Create(word);
+  }
+  if (word == FX_BSTRC("true") || word == FX_BSTRC("false")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_BOOLEAN;
+    }
+    return CPDF_Boolean::Create(word == FX_BSTRC("true"));
+  }
+  if (word == FX_BSTRC("null")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NULL;
+    }
+    return CPDF_Null::Create();
+  }
+  if (word == FX_BSTRC("(")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_STRING;
+    }
+    CFX_ByteString str = ReadString();
+    if (m_pCryptoHandler) {
+      m_pCryptoHandler->Decrypt(objnum, gennum, str);
+    }
+    return CPDF_String::Create(str, FALSE);
+  }
+  if (word == FX_BSTRC("<")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_STRING;
+    }
+    CFX_ByteString str = ReadHexString();
+    if (m_pCryptoHandler) {
+      m_pCryptoHandler->Decrypt(objnum, gennum, str);
+    }
+    return CPDF_String::Create(str, TRUE);
+  }
+  if (word == FX_BSTRC("[")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_ARRAY;
+    }
+    CPDF_Array* pArray = CPDF_Array::Create();
+    while (1) {
+      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
+      if (pObj == NULL) {
+        if (m_WordBuffer[0] == ']') {
+          return pArray;
+        }
+        if (pArray) {
+          pArray->Release();
+        }
+        return NULL;
+      }
+      pArray->Add(pObj);
+    }
+  }
+  if (word[0] == '/') {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_NAME;
+    }
+    return CPDF_Name::Create(
+        PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1)));
+  }
+  if (word == FX_BSTRC("<<")) {
+    if (bTypeOnly) {
+      return (CPDF_Object*)PDFOBJ_DICTIONARY;
+    }
+    if (pContext) {
+      pContext->m_DictStart = SavedPos;
+    }
+    CPDF_Dictionary* pDict = CPDF_Dictionary::Create();
+    while (1) {
+      FX_BOOL bIsNumber;
+      FX_FILESIZE SavedPos = m_Pos;
+      CFX_ByteString key = GetNextWord(bIsNumber);
+      if (key.IsEmpty()) {
+        if (pDict) {
+          pDict->Release();
+        }
+        return NULL;
+      }
+      if (key == FX_BSTRC(">>")) {
+        break;
+      }
+      if (key == FX_BSTRC("endobj")) {
+        m_Pos = SavedPos;
+        break;
+      }
+      if (key[0] != '/') {
+        continue;
+      }
+      key = PDF_NameDecode(key);
+      CPDF_Object* pObj = GetObject(pObjList, objnum, gennum);
+      if (pObj == NULL) {
+        if (pDict) {
+          pDict->Release();
+        }
+        uint8_t ch;
+        while (1) {
+          if (!GetNextChar(ch)) {
+            break;
+          }
+          if (ch == 0x0A || ch == 0x0D) {
+            break;
+          }
+        }
+        return NULL;
+      }
+      if (key.GetLength() > 1) {
+        pDict->AddValue(CFX_ByteStringC(key.c_str() + 1, key.GetLength() - 1),
+                        pObj);
+      }
+    }
+    if (pContext) {
+      pContext->m_DictEnd = m_Pos;
+      if (pContext->m_Flags & PDFPARSE_NOSTREAM) {
+        return pDict;
+      }
+    }
+    FX_FILESIZE SavedPos = m_Pos;
+    FX_BOOL bIsNumber;
+    CFX_ByteString nextword = GetNextWord(bIsNumber);
+    if (nextword == FX_BSTRC("stream")) {
+      CPDF_Stream* pStream = ReadStream(pDict, pContext, objnum, gennum);
+      if (pStream) {
+        return pStream;
+      }
+      if (pDict) {
+        pDict->Release();
+      }
+      return NULL;
+    } else {
+      m_Pos = SavedPos;
+      return pDict;
+    }
+  }
+  if (word == FX_BSTRC(">>")) {
+    m_Pos = SavedPos;
+    return NULL;
+  }
+  if (bTypeOnly) {
+    return (CPDF_Object*)PDFOBJ_INVALID;
+  }
+  return NULL;
+}
+unsigned int CPDF_SyntaxParser::ReadEOLMarkers(FX_FILESIZE pos) {
+  unsigned char byte1 = 0;
+  unsigned char byte2 = 0;
+  GetCharAt(pos, byte1);
+  GetCharAt(pos + 1, byte2);
+  unsigned int markers = 0;
+  if (byte1 == '\r' && byte2 == '\n') {
+    markers = 2;
+  } else if (byte1 == '\r' || byte1 == '\n') {
+    markers = 1;
+  }
+  return markers;
+}
+CPDF_Stream* CPDF_SyntaxParser::ReadStream(CPDF_Dictionary* pDict,
+                                           PARSE_CONTEXT* pContext,
+                                           FX_DWORD objnum,
+                                           FX_DWORD gennum) {
+  CPDF_Object* pLenObj = pDict->GetElement(FX_BSTRC("Length"));
+  FX_FILESIZE len = -1;
+  if (pLenObj && ((pLenObj->GetType() != PDFOBJ_REFERENCE) ||
+                  ((((CPDF_Reference*)pLenObj)->GetObjList()) &&
+                   ((CPDF_Reference*)pLenObj)->GetRefObjNum() != objnum))) {
+    len = pLenObj->GetInteger();
+  }
+  // Check whether end of line markers follow the keyword 'stream'.
+  unsigned int numMarkers = ReadEOLMarkers(m_Pos);
+  m_Pos += numMarkers;
+  FX_FILESIZE streamStartPos = m_Pos;
+  if (pContext) {
+    pContext->m_DataStart = streamStartPos;
+  }
+  const unsigned int ENDSTREAM_LEN = sizeof("endstream") - 1;
+  const unsigned int ENDOBJ_LEN = sizeof("endobj") - 1;
+  CPDF_CryptoHandler* pCryptoHandler =
+      objnum == (FX_DWORD)m_MetadataObjnum ? nullptr : m_pCryptoHandler;
+  if (!pCryptoHandler) {
+    FX_BOOL bSearchForKeyword = TRUE;
+    unsigned int prevMarkers = 0;
+    unsigned int nextMarkers = 0;
+    if (len >= 0) {
+      pdfium::base::CheckedNumeric<FX_FILESIZE> pos = m_Pos;
+      pos += len;
+      if (pos.IsValid() && pos.ValueOrDie() < m_FileLen) {
+        m_Pos = pos.ValueOrDie();
+      }
+      prevMarkers = ReadEOLMarkers(m_Pos);
+      GetNextWord();
+      nextMarkers = ReadEOLMarkers(m_Pos);
+      if (m_WordSize == ENDSTREAM_LEN && prevMarkers != 0 && nextMarkers != 0 &&
+          FXSYS_memcmp(m_WordBuffer, "endstream", ENDSTREAM_LEN) == 0) {
+        bSearchForKeyword = FALSE;
+      }
+    }
+    if (bSearchForKeyword) {
+      // If len is not available, len needs to be calculated
+      // by searching the keywords "endstream" or "endobj".
+      m_Pos = streamStartPos;
+      FX_FILESIZE endStreamOffset = 0;
+      while (endStreamOffset >= 0) {
+        endStreamOffset = FindTag(FX_BSTRC("endstream"), 0);
+        if (endStreamOffset < 0) {
+          // Can't find any "endstream".
+          break;
+        }
+        prevMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 1);
+        nextMarkers =
+            ReadEOLMarkers(streamStartPos + endStreamOffset + ENDSTREAM_LEN);
+        if (prevMarkers != 0 && nextMarkers != 0) {
+          // Stop searching when the keyword "endstream" is found.
+          break;
+        } else {
+          unsigned char ch = 0x00;
+          GetCharAt(streamStartPos + endStreamOffset + ENDSTREAM_LEN, ch);
+          if (ch == 0x09 || ch == 0x20) {
+            //"endstream" is treated as a keyword
+            // when it is followed by a tab or whitespace
+            break;
+          }
+        }
+        m_Pos += ENDSTREAM_LEN;
+      }
+      m_Pos = streamStartPos;
+      FX_FILESIZE endObjOffset = 0;
+      while (endObjOffset >= 0) {
+        endObjOffset = FindTag(FX_BSTRC("endobj"), 0);
+        if (endObjOffset < 0) {
+          // Can't find any "endobj".
+          break;
+        }
+        prevMarkers = ReadEOLMarkers(streamStartPos + endObjOffset - 1);
+        nextMarkers =
+            ReadEOLMarkers(streamStartPos + endObjOffset + ENDOBJ_LEN);
+        if (prevMarkers != 0 && nextMarkers != 0) {
+          // Stop searching when the keyword "endobj" is found.
+          break;
+        }
+        m_Pos += ENDOBJ_LEN;
+      }
+      if (endStreamOffset < 0 && endObjOffset < 0) {
+        // Can't find "endstream" or "endobj".
+        return nullptr;
+      }
+      if (endStreamOffset < 0 && endObjOffset >= 0) {
+        // Correct the position of end stream.
+        endStreamOffset = endObjOffset;
+      } else if (endStreamOffset >= 0 && endObjOffset < 0) {
+        // Correct the position of end obj.
+        endObjOffset = endStreamOffset;
+      } else if (endStreamOffset > endObjOffset) {
+        endStreamOffset = endObjOffset;
+      }
+      len = endStreamOffset;
+      numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 2);
+      if (numMarkers == 2) {
+        len -= 2;
+      } else {
+        numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 1);
+        if (numMarkers == 1) {
+          len -= 1;
+        }
+      }
+      if (len <= 0) {
+        return nullptr;
+      }
+      pDict->SetAtInteger(FX_BSTRC("Length"), len);
+    }
+    m_Pos = streamStartPos;
+  }
+  if (len <= 0) {
+    return nullptr;
+  }
+  uint8_t* pData = FX_Alloc(uint8_t, len);
+  ReadBlock(pData, len);
+  if (pCryptoHandler) {
+    CFX_BinaryBuf dest_buf;
+    dest_buf.EstimateSize(pCryptoHandler->DecryptGetSize(len));
+    void* context = pCryptoHandler->DecryptStart(objnum, gennum);
+    pCryptoHandler->DecryptStream(context, pData, len, dest_buf);
+    pCryptoHandler->DecryptFinish(context, dest_buf);
+    FX_Free(pData);
+    pData = dest_buf.GetBuffer();
+    len = dest_buf.GetSize();
+    dest_buf.DetachBuffer();
+  }
+  CPDF_Stream* pStream = new CPDF_Stream(pData, len, pDict);
+  if (pContext) {
+    pContext->m_DataEnd = pContext->m_DataStart + len;
+  }
+  streamStartPos = m_Pos;
+  GetNextWord();
+  numMarkers = ReadEOLMarkers(m_Pos);
+  if (m_WordSize == ENDOBJ_LEN && numMarkers != 0 &&
+      FXSYS_memcmp(m_WordBuffer, "endobj", ENDOBJ_LEN) == 0) {
+    m_Pos = streamStartPos;
+  }
+  return pStream;
+}
+void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess,
+                                   FX_DWORD HeaderOffset) {
+  FX_Free(m_pFileBuf);
+  m_pFileBuf = FX_Alloc(uint8_t, m_BufSize);
+  m_HeaderOffset = HeaderOffset;
+  m_FileLen = pFileAccess->GetSize();
+  m_Pos = 0;
+  m_pFileAccess = pFileAccess;
+  m_BufOffset = 0;
+  pFileAccess->ReadBlock(
+      m_pFileBuf, 0,
+      (size_t)((FX_FILESIZE)m_BufSize > m_FileLen ? m_FileLen : m_BufSize));
+}
+int32_t CPDF_SyntaxParser::GetDirectNum() {
+  GetNextWord();
+  if (!m_bIsNumber) {
+    return 0;
+  }
+  m_WordBuffer[m_WordSize] = 0;
+  return FXSYS_atoi((const FX_CHAR*)m_WordBuffer);
+}
+FX_BOOL CPDF_SyntaxParser::IsWholeWord(FX_FILESIZE startpos,
+                                       FX_FILESIZE limit,
+                                       const uint8_t* tag,
+                                       FX_DWORD taglen) {
+  uint8_t type = PDF_CharType[tag[0]];
+  FX_BOOL bCheckLeft = type != 'D' && type != 'W';
+  type = PDF_CharType[tag[taglen - 1]];
+  FX_BOOL bCheckRight = type != 'D' && type != 'W';
+  uint8_t ch;
+  if (bCheckRight && startpos + (int32_t)taglen <= limit &&
+      GetCharAt(startpos + (int32_t)taglen, ch)) {
+    uint8_t type = PDF_CharType[ch];
+    if (type == 'N' || type == 'R') {
+      return FALSE;
+    }
+  }
+  if (bCheckLeft && startpos > 0 && GetCharAt(startpos - 1, ch)) {
+    uint8_t type = PDF_CharType[ch];
+    if (type == 'N' || type == 'R') {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_SyntaxParser::SearchWord(const CFX_ByteStringC& tag,
+                                      FX_BOOL bWholeWord,
+                                      FX_BOOL bForward,
+                                      FX_FILESIZE limit) {
+  int32_t taglen = tag.GetLength();
+  if (taglen == 0) {
+    return FALSE;
+  }
+  FX_FILESIZE pos = m_Pos;
+  int32_t offset = 0;
+  if (!bForward) {
+    offset = taglen - 1;
+  }
+  const uint8_t* tag_data = tag.GetPtr();
+  uint8_t byte;
+  while (1) {
+    if (bForward) {
+      if (limit) {
+        if (pos >= m_Pos + limit) {
+          return FALSE;
+        }
+      }
+      if (!GetCharAt(pos, byte)) {
+        return FALSE;
+      }
+    } else {
+      if (limit) {
+        if (pos <= m_Pos - limit) {
+          return FALSE;
+        }
+      }
+      if (!GetCharAtBackward(pos, byte)) {
+        return FALSE;
+      }
+    }
+    if (byte == tag_data[offset]) {
+      if (bForward) {
+        offset++;
+        if (offset < taglen) {
+          pos++;
+          continue;
+        }
+      } else {
+        offset--;
+        if (offset >= 0) {
+          pos--;
+          continue;
+        }
+      }
+      FX_FILESIZE startpos = bForward ? pos - taglen + 1 : pos;
+      if (!bWholeWord || IsWholeWord(startpos, limit, tag.GetPtr(), taglen)) {
+        m_Pos = startpos;
+        return TRUE;
+      }
+    }
+    if (bForward) {
+      offset = byte == tag_data[0] ? 1 : 0;
+      pos++;
+    } else {
+      offset = byte == tag_data[taglen - 1] ? taglen - 2 : taglen - 1;
+      pos--;
+    }
+    if (pos < 0) {
+      return FALSE;
+    }
+  }
+  return FALSE;
+}
+struct _SearchTagRecord {
+  const uint8_t* m_pTag;
+  FX_DWORD m_Len;
+  FX_DWORD m_Offset;
+};
+int32_t CPDF_SyntaxParser::SearchMultiWord(const CFX_ByteStringC& tags,
+                                           FX_BOOL bWholeWord,
+                                           FX_FILESIZE limit) {
+  int32_t ntags = 1, i;
+  for (i = 0; i < tags.GetLength(); i++)
+    if (tags[i] == 0) {
+      ntags++;
+    }
+  _SearchTagRecord* pPatterns = FX_Alloc(_SearchTagRecord, ntags);
+  FX_DWORD start = 0, itag = 0, max_len = 0;
+  for (i = 0; i <= tags.GetLength(); i++) {
+    if (tags[i] == 0) {
+      FX_DWORD len = i - start;
+      if (len > max_len) {
+        max_len = len;
+      }
+      pPatterns[itag].m_pTag = tags.GetPtr() + start;
+      pPatterns[itag].m_Len = len;
+      pPatterns[itag].m_Offset = 0;
+      start = i + 1;
+      itag++;
+    }
+  }
+  FX_FILESIZE pos = m_Pos;
+  uint8_t byte;
+  GetCharAt(pos++, byte);
+  int32_t found = -1;
+  while (1) {
+    for (i = 0; i < ntags; i++) {
+      if (pPatterns[i].m_pTag[pPatterns[i].m_Offset] == byte) {
+        pPatterns[i].m_Offset++;
+        if (pPatterns[i].m_Offset == pPatterns[i].m_Len) {
+          if (!bWholeWord ||
+              IsWholeWord(pos - pPatterns[i].m_Len, limit, pPatterns[i].m_pTag,
+                          pPatterns[i].m_Len)) {
+            found = i;
+            goto end;
+          } else {
+            if (pPatterns[i].m_pTag[0] == byte) {
+              pPatterns[i].m_Offset = 1;
+            } else {
+              pPatterns[i].m_Offset = 0;
+            }
+          }
+        }
+      } else {
+        if (pPatterns[i].m_pTag[0] == byte) {
+          pPatterns[i].m_Offset = 1;
+        } else {
+          pPatterns[i].m_Offset = 0;
+        }
+      }
+    }
+    if (limit && pos >= m_Pos + limit) {
+      goto end;
+    }
+    if (!GetCharAt(pos, byte)) {
+      goto end;
+    }
+    pos++;
+  }
+end:
+  FX_Free(pPatterns);
+  return found;
+}
+FX_FILESIZE CPDF_SyntaxParser::FindTag(const CFX_ByteStringC& tag,
+                                       FX_FILESIZE limit) {
+  int32_t taglen = tag.GetLength();
+  int32_t match = 0;
+  limit += m_Pos;
+  FX_FILESIZE startpos = m_Pos;
+  while (1) {
+    uint8_t ch;
+    if (!GetNextChar(ch)) {
+      return -1;
+    }
+    if (ch == tag[match]) {
+      match++;
+      if (match == taglen) {
+        return m_Pos - startpos - taglen;
+      }
+    } else {
+      match = ch == tag[0] ? 1 : 0;
+    }
+    if (limit && m_Pos == limit) {
+      return -1;
+    }
+  }
+  return -1;
+}
+void CPDF_SyntaxParser::GetBinary(uint8_t* buffer, FX_DWORD size) {
+  FX_DWORD offset = 0;
+  uint8_t ch;
+  while (1) {
+    if (!GetNextChar(ch)) {
+      return;
+    }
+    buffer[offset++] = ch;
+    if (offset == size) {
+      break;
+    }
+  }
+}
+
+class CPDF_DataAvail final : public IPDF_DataAvail {
+ public:
+  CPDF_DataAvail(IFX_FileAvail* pFileAvail,
+                 IFX_FileRead* pFileRead,
+                 FX_BOOL bSupportHintTable = FALSE);
+  ~CPDF_DataAvail() override;
+
+  virtual FX_BOOL IsDocAvail(IFX_DownloadHints* pHints) override;
+
+  virtual void SetDocument(CPDF_Document* pDoc) override;
+
+  virtual FX_BOOL IsPageAvail(int iPage, IFX_DownloadHints* pHints) override;
+
+  virtual int32_t IsFormAvail(IFX_DownloadHints* pHints) override;
+
+  virtual int32_t IsLinearizedPDF() override;
+
+  virtual FX_BOOL IsLinearized() override { return m_bLinearized; }
+
+  virtual void GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
+                                         FX_DWORD* pSize) override;
+  int GetPageCount() const;
+  CPDF_Dictionary* GetPage(int index);
+
+ protected:
+  static const int kMaxDataAvailRecursionDepth = 64;
+  static int s_CurrentDataAvailRecursionDepth;
+
+  FX_DWORD GetObjectSize(FX_DWORD objnum, FX_FILESIZE& offset);
+  FX_BOOL IsObjectsAvail(CFX_PtrArray& obj_array,
+                         FX_BOOL bParsePage,
+                         IFX_DownloadHints* pHints,
+                         CFX_PtrArray& ret_array);
+  FX_BOOL CheckDocStatus(IFX_DownloadHints* pHints);
+  FX_BOOL CheckHeader(IFX_DownloadHints* pHints);
+  FX_BOOL CheckFirstPage(IFX_DownloadHints* pHints);
+  FX_BOOL CheckHintTables(IFX_DownloadHints* pHints);
+  FX_BOOL CheckEnd(IFX_DownloadHints* pHints);
+  FX_BOOL CheckCrossRef(IFX_DownloadHints* pHints);
+  FX_BOOL CheckCrossRefItem(IFX_DownloadHints* pHints);
+  FX_BOOL CheckTrailer(IFX_DownloadHints* pHints);
+  FX_BOOL CheckRoot(IFX_DownloadHints* pHints);
+  FX_BOOL CheckInfo(IFX_DownloadHints* pHints);
+  FX_BOOL CheckPages(IFX_DownloadHints* pHints);
+  FX_BOOL CheckPage(IFX_DownloadHints* pHints);
+  FX_BOOL CheckResources(IFX_DownloadHints* pHints);
+  FX_BOOL CheckAnnots(IFX_DownloadHints* pHints);
+  FX_BOOL CheckAcroForm(IFX_DownloadHints* pHints);
+  FX_BOOL CheckAcroFormSubObject(IFX_DownloadHints* pHints);
+  FX_BOOL CheckTrailerAppend(IFX_DownloadHints* pHints);
+  FX_BOOL CheckPageStatus(IFX_DownloadHints* pHints);
+  FX_BOOL CheckAllCrossRefStream(IFX_DownloadHints* pHints);
+
+  int32_t CheckCrossRefStream(IFX_DownloadHints* pHints,
+                              FX_FILESIZE& xref_offset);
+  FX_BOOL IsLinearizedFile(uint8_t* pData, FX_DWORD dwLen);
+  void SetStartOffset(FX_FILESIZE dwOffset);
+  FX_BOOL GetNextToken(CFX_ByteString& token);
+  FX_BOOL GetNextChar(uint8_t& ch);
+  CPDF_Object* ParseIndirectObjectAt(FX_FILESIZE pos,
+                                     FX_DWORD objnum,
+                                     CPDF_IndirectObjects* pObjList = NULL);
+  CPDF_Object* GetObject(FX_DWORD objnum,
+                         IFX_DownloadHints* pHints,
+                         FX_BOOL* pExistInFile);
+  FX_BOOL GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages);
+  FX_BOOL PreparePageItem();
+  FX_BOOL LoadPages(IFX_DownloadHints* pHints);
+  FX_BOOL LoadAllXref(IFX_DownloadHints* pHints);
+  FX_BOOL LoadAllFile(IFX_DownloadHints* pHints);
+  FX_BOOL CheckLinearizedData(IFX_DownloadHints* pHints);
+  FX_BOOL CheckFileResources(IFX_DownloadHints* pHints);
+  FX_BOOL CheckPageAnnots(int iPage, IFX_DownloadHints* pHints);
+
+  FX_BOOL CheckLinearizedFirstPage(int iPage, IFX_DownloadHints* pHints);
+  FX_BOOL HaveResourceAncestor(CPDF_Dictionary* pDict);
+  FX_BOOL CheckPage(int32_t iPage, IFX_DownloadHints* pHints);
+  FX_BOOL LoadDocPages(IFX_DownloadHints* pHints);
+  FX_BOOL LoadDocPage(int32_t iPage, IFX_DownloadHints* pHints);
+  FX_BOOL CheckPageNode(CPDF_PageNode& pageNodes,
+                        int32_t iPage,
+                        int32_t& iCount,
+                        IFX_DownloadHints* pHints);
+  FX_BOOL CheckUnkownPageNode(FX_DWORD dwPageNo,
+                              CPDF_PageNode* pPageNode,
+                              IFX_DownloadHints* pHints);
+  FX_BOOL CheckArrayPageNode(FX_DWORD dwPageNo,
+                             CPDF_PageNode* pPageNode,
+                             IFX_DownloadHints* pHints);
+  FX_BOOL CheckPageCount(IFX_DownloadHints* pHints);
+  FX_BOOL IsFirstCheck(int iPage);
+  void ResetFirstCheck(int iPage);
+  FX_BOOL IsDataAvail(FX_FILESIZE offset,
+                      FX_DWORD size,
+                      IFX_DownloadHints* pHints);
+
+  CPDF_Parser m_parser;
+
+  CPDF_SyntaxParser m_syntaxParser;
+
+  CPDF_Object* m_pRoot;
+
+  FX_DWORD m_dwRootObjNum;
+
+  FX_DWORD m_dwInfoObjNum;
+
+  CPDF_Object* m_pLinearized;
+
+  CPDF_Object* m_pTrailer;
+
+  FX_BOOL m_bDocAvail;
+
+  FX_FILESIZE m_dwHeaderOffset;
+
+  FX_FILESIZE m_dwLastXRefOffset;
+
+  FX_FILESIZE m_dwXRefOffset;
+
+  FX_FILESIZE m_dwTrailerOffset;
+
+  FX_FILESIZE m_dwCurrentOffset;
+
+  PDF_DATAAVAIL_STATUS m_docStatus;
+
+  FX_FILESIZE m_dwFileLen;
+
+  CPDF_Document* m_pDocument;
+
+  CPDF_SortObjNumArray m_objnum_array;
+
+  CFX_PtrArray m_objs_array;
+
+  FX_FILESIZE m_Pos;
+
+  FX_FILESIZE m_bufferOffset;
+
+  FX_DWORD m_bufferSize;
+
+  CFX_ByteString m_WordBuf;
+
+  uint8_t m_WordBuffer[257];
+
+  FX_DWORD m_WordSize;
+
+  uint8_t m_bufferData[512];
+
+  CFX_FileSizeArray m_CrossOffset;
+
+  CFX_DWordArray m_XRefStreamList;
+
+  CFX_DWordArray m_PageObjList;
+
+  FX_DWORD m_PagesObjNum;
+
+  FX_BOOL m_bLinearized;
+
+  FX_DWORD m_dwFirstPageNo;
+
+  FX_BOOL m_bLinearedDataOK;
+
+  FX_BOOL m_bMainXRefLoadTried;
+
+  FX_BOOL m_bMainXRefLoadedOK;
+
+  FX_BOOL m_bPagesTreeLoad;
+
+  FX_BOOL m_bPagesLoad;
+
+  CPDF_Parser* m_pCurrentParser;
+
+  FX_FILESIZE m_dwCurrentXRefSteam;
+
+  FX_BOOL m_bAnnotsLoad;
+
+  FX_BOOL m_bHaveAcroForm;
+
+  FX_DWORD m_dwAcroFormObjNum;
+
+  FX_BOOL m_bAcroFormLoad;
+
+  CPDF_Object* m_pAcroForm;
+
+  CFX_PtrArray m_arrayAcroforms;
+
+  CPDF_Dictionary* m_pPageDict;
+
+  CPDF_Object* m_pPageResource;
+
+  FX_BOOL m_bNeedDownLoadResource;
+
+  FX_BOOL m_bPageLoadedOK;
+
+  FX_BOOL m_bLinearizedFormParamLoad;
+
+  CFX_PtrArray m_PagesArray;
+
+  FX_DWORD m_dwEncryptObjNum;
+
+  FX_FILESIZE m_dwPrevXRefOffset;
+
+  FX_BOOL m_bTotalLoadPageTree;
+
+  FX_BOOL m_bCurPageDictLoadOK;
+
+  CPDF_PageNode m_pageNodes;
+
+  std::set<FX_DWORD> m_pageMapCheckState;
+  std::set<FX_DWORD> m_pagesLoadState;
+
+  CPDF_HintTables* m_pHintTables;
+  FX_BOOL m_bSupportHintTable;
+
+ public:
+  friend class CPDF_HintTables;

[Tom Sepez, 2015/09/22 00:05:38]

nit: we'd be happier if you added the corresponding accessor methods for the
fields you want to manipulate by this friending.

+};
+
+IPDF_DataAvail::IPDF_DataAvail(IFX_FileAvail* pFileAvail,
+                               IFX_FileRead* pFileRead)
+    : m_pFileAvail(pFileAvail), m_pFileRead(pFileRead) {
+}
+
+// static
+IPDF_DataAvail* IPDF_DataAvail::Create(IFX_FileAvail* pFileAvail,
+                                       IFX_FileRead* pFileRead) {
+  return new CPDF_DataAvail(pFileAvail, pFileRead);
+}
+
+// static
+int CPDF_DataAvail::s_CurrentDataAvailRecursionDepth = 0;
+
+CPDF_DataAvail::CPDF_DataAvail(IFX_FileAvail* pFileAvail,
+                               IFX_FileRead* pFileRead,
+                               FX_BOOL bSupportHintTable)
+    : IPDF_DataAvail(pFileAvail, pFileRead) {
+  m_Pos = 0;
+  m_dwFileLen = 0;
+  if (m_pFileRead) {
+    m_dwFileLen = (FX_DWORD)m_pFileRead->GetSize();
+  }
+  m_dwCurrentOffset = 0;
+  m_WordSize = 0;
+  m_dwXRefOffset = 0;
+  m_bufferOffset = 0;
+  m_dwFirstPageNo = 0;
+  m_bufferSize = 0;
+  m_PagesObjNum = 0;
+  m_dwCurrentXRefSteam = 0;
+  m_dwAcroFormObjNum = 0;
+  m_dwInfoObjNum = 0;
+  m_pDocument = 0;
+  m_dwEncryptObjNum = 0;
+  m_dwPrevXRefOffset = 0;
+  m_dwLastXRefOffset = 0;
+  m_bDocAvail = FALSE;
+  m_bMainXRefLoadTried = FALSE;
+  m_bDocAvail = FALSE;
+  m_bLinearized = FALSE;
+  m_bPagesLoad = FALSE;
+  m_bPagesTreeLoad = FALSE;
+  m_bMainXRefLoadedOK = FALSE;
+  m_bAnnotsLoad = FALSE;
+  m_bHaveAcroForm = FALSE;
+  m_bAcroFormLoad = FALSE;
+  m_bPageLoadedOK = FALSE;
+  m_bNeedDownLoadResource = FALSE;
+  m_bLinearizedFormParamLoad = FALSE;
+  m_pLinearized = NULL;
+  m_pRoot = NULL;
+  m_pTrailer = NULL;
+  m_pCurrentParser = NULL;
+  m_pAcroForm = NULL;
+  m_pPageDict = NULL;
+  m_pPageResource = NULL;
+  m_docStatus = PDF_DATAAVAIL_HEADER;
+  m_parser.m_bOwnFileRead = FALSE;
+  m_bTotalLoadPageTree = FALSE;
+  m_bCurPageDictLoadOK = FALSE;
+  m_bLinearedDataOK = FALSE;
+  m_pHintTables = NULL;
+  m_bSupportHintTable = bSupportHintTable;
+}
+CPDF_DataAvail::~CPDF_DataAvail() {
+  if (m_pLinearized) {
+    m_pLinearized->Release();
+  }
+  if (m_pRoot) {
+    m_pRoot->Release();
+  }
+  if (m_pTrailer) {
+    m_pTrailer->Release();
+  }
+  if (m_pHintTables) {

[Tom Sepez, 2015/09/22 00:05:38]

nit: just delete m_pHintables.  There's no need to check for nullness, C++
handles that for you.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+    delete m_pHintTables;

[Tom Sepez, 2015/09/22 00:05:39]

if CPDF_DataAvail owns these hint tables, then use nonstd::unique_ptr<> and
deletion becomes automatic.

+  }
+  int32_t i = 0;
+  int32_t iSize = m_arrayAcroforms.GetSize();
+  for (i = 0; i < iSize; ++i) {
+    ((CPDF_Object*)m_arrayAcroforms.GetAt(i))->Release();
+  }
+}
+void CPDF_DataAvail::SetDocument(CPDF_Document* pDoc) {
+  m_pDocument = pDoc;
+}
+FX_DWORD CPDF_DataAvail::GetObjectSize(FX_DWORD objnum, FX_FILESIZE& offset) {
+  CPDF_Parser* pParser = (CPDF_Parser*)(m_pDocument->GetParser());
+  if (pParser == NULL) {
+    return 0;
+  }
+  if (objnum >= (FX_DWORD)pParser->m_CrossRef.GetSize()) {
+    return 0;
+  }
+  if (pParser->m_V5Type[objnum] == 2) {
+    objnum = (FX_DWORD)pParser->m_CrossRef[objnum];
+  }
+  if (pParser->m_V5Type[objnum] == 1 || pParser->m_V5Type[objnum] == 255) {
+    offset = pParser->m_CrossRef[objnum];
+    if (offset == 0) {
+      return 0;
+    }
+    void* pResult = FXSYS_bsearch(&offset, pParser->m_SortedOffset.GetData(),
+                                  pParser->m_SortedOffset.GetSize(),
+                                  sizeof(FX_FILESIZE), _CompareFileSize);
+    if (pResult == NULL) {
+      return 0;
+    }
+    if ((FX_FILESIZE*)pResult -
+            (FX_FILESIZE*)pParser->m_SortedOffset.GetData() ==
+        pParser->m_SortedOffset.GetSize() - 1) {
+      return 0;
+    }
+    return (FX_DWORD)(((FX_FILESIZE*)pResult)[1] - offset);
+  }
+  return 0;
+}
+FX_BOOL CPDF_DataAvail::IsObjectsAvail(CFX_PtrArray& obj_array,
+                                       FX_BOOL bParsePage,
+                                       IFX_DownloadHints* pHints,
+                                       CFX_PtrArray& ret_array) {
+  if (!obj_array.GetSize()) {
+    return TRUE;
+  }
+  FX_DWORD count = 0;
+  CFX_PtrArray new_obj_array;
+  int32_t i = 0;
+  for (i = 0; i < obj_array.GetSize(); i++) {
+    CPDF_Object* pObj = (CPDF_Object*)obj_array[i];
+    if (!pObj) {
+      continue;
+    }
+    int32_t type = pObj->GetType();
+    switch (type) {
+      case PDFOBJ_ARRAY: {
+        CPDF_Array* pArray = pObj->GetArray();
+        for (FX_DWORD k = 0; k < pArray->GetCount(); k++) {
+          new_obj_array.Add(pArray->GetElement(k));
+        }
+      } break;
+      case PDFOBJ_STREAM:
+        pObj = pObj->GetDict();
+      case PDFOBJ_DICTIONARY: {
+        CPDF_Dictionary* pDict = pObj->GetDict();
+        if (pDict && pDict->GetString("Type") == "Page" && !bParsePage) {
+          continue;
+        }
+        FX_POSITION pos = pDict->GetStartPos();
+        while (pos) {
+          CPDF_Object* value;
+          CFX_ByteString key;
+          value = pDict->GetNextElement(pos, key);
+          if (key != "Parent") {
+            new_obj_array.Add(value);
+          }
+        }
+      } break;
+      case PDFOBJ_REFERENCE: {
+        CPDF_Reference* pRef = (CPDF_Reference*)pObj;
+        FX_DWORD dwNum = pRef->GetRefObjNum();
+        FX_FILESIZE offset;
+        FX_DWORD size = GetObjectSize(dwNum, offset);
+        if (size == 0 || offset < 0 || offset >= m_dwFileLen) {
+          break;
+        }
+        if (!IsDataAvail(offset, size, pHints)) {
+          ret_array.Add(pObj);
+          count++;
+        } else if (!m_objnum_array.Find(dwNum)) {
+          m_objnum_array.AddObjNum(dwNum);
+          CPDF_Object* pReferred =
+              m_pDocument->GetIndirectObject(pRef->GetRefObjNum(), NULL);
+          if (pReferred) {
+            new_obj_array.Add(pReferred);
+          }
+        }
+      } break;
+    }
+  }
+  if (count > 0) {
+    int32_t iSize = new_obj_array.GetSize();
+    for (i = 0; i < iSize; ++i) {
+      CPDF_Object* pObj = (CPDF_Object*)new_obj_array[i];
+      int32_t type = pObj->GetType();
+      if (type == PDFOBJ_REFERENCE) {
+        CPDF_Reference* pRef = (CPDF_Reference*)pObj;
+        FX_DWORD dwNum = pRef->GetRefObjNum();
+        if (!m_objnum_array.Find(dwNum)) {
+          ret_array.Add(pObj);
+        }
+      } else {
+        ret_array.Add(pObj);
+      }
+    }
+    return FALSE;
+  }
+  obj_array.RemoveAll();
+  obj_array.Append(new_obj_array);
+  return IsObjectsAvail(obj_array, FALSE, pHints, ret_array);
+}
+FX_BOOL CPDF_DataAvail::IsDocAvail(IFX_DownloadHints* pHints) {
+  if (!m_dwFileLen && m_pFileRead) {
+    m_dwFileLen = (FX_DWORD)m_pFileRead->GetSize();
+    if (!m_dwFileLen) {
+      return TRUE;
+    }
+  }
+  while (!m_bDocAvail) {
+    if (!CheckDocStatus(pHints)) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckAcroFormSubObject(IFX_DownloadHints* pHints) {
+  if (!m_objs_array.GetSize()) {
+    m_objs_array.RemoveAll();
+    m_objnum_array.RemoveAll();
+    CFX_PtrArray obj_array;
+    obj_array.Append(m_arrayAcroforms);
+    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
+    if (bRet) {
+      m_objs_array.RemoveAll();
+    }
+    return bRet;
+  }
+  CFX_PtrArray new_objs_array;
+  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+  if (bRet) {
+    int32_t iSize = m_arrayAcroforms.GetSize();
+    for (int32_t i = 0; i < iSize; ++i) {
+      ((CPDF_Object*)m_arrayAcroforms.GetAt(i))->Release();
+    }
+    m_arrayAcroforms.RemoveAll();
+  } else {
+    m_objs_array.RemoveAll();
+    m_objs_array.Append(new_objs_array);
+  }
+  return bRet;
+}
+FX_BOOL CPDF_DataAvail::CheckAcroForm(IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  m_pAcroForm = GetObject(m_dwAcroFormObjNum, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_PAGETREE;
+    return TRUE;
+  }
+  if (!m_pAcroForm) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      return TRUE;
+    }
+    return FALSE;
+  }
+  m_arrayAcroforms.Add(m_pAcroForm);
+  m_docStatus = PDF_DATAAVAIL_PAGETREE;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckDocStatus(IFX_DownloadHints* pHints) {
+  switch (m_docStatus) {
+    case PDF_DATAAVAIL_HEADER:
+      return CheckHeader(pHints);
+    case PDF_DATAAVAIL_FIRSTPAGE:
+    case PDF_DATAAVAIL_FIRSTPAGE_PREPARE:
+      return CheckFirstPage(pHints);
+    case PDF_DATAAVAIL_HINTTABLE:
+      return CheckHintTables(pHints);
+    case PDF_DATAAVAIL_END:
+      return CheckEnd(pHints);
+    case PDF_DATAAVAIL_CROSSREF:
+      return CheckCrossRef(pHints);
+    case PDF_DATAAVAIL_CROSSREF_ITEM:
+      return CheckCrossRefItem(pHints);
+    case PDF_DATAAVAIL_CROSSREF_STREAM:
+      return CheckAllCrossRefStream(pHints);
+    case PDF_DATAAVAIL_TRAILER:
+      return CheckTrailer(pHints);
+    case PDF_DATAAVAIL_TRAILER_APPEND:
+      return CheckTrailerAppend(pHints);
+    case PDF_DATAAVAIL_LOADALLCRSOSSREF:
+      return LoadAllXref(pHints);
+    case PDF_DATAAVAIL_LOADALLFILE:
+      return LoadAllFile(pHints);
+    case PDF_DATAAVAIL_ROOT:
+      return CheckRoot(pHints);
+    case PDF_DATAAVAIL_INFO:
+      return CheckInfo(pHints);
+    case PDF_DATAAVAIL_ACROFORM:
+      return CheckAcroForm(pHints);
+    case PDF_DATAAVAIL_PAGETREE:
+      if (m_bTotalLoadPageTree) {
+        return CheckPages(pHints);
+      }
+      return LoadDocPages(pHints);
+    case PDF_DATAAVAIL_PAGE:
+      if (m_bTotalLoadPageTree) {
+        return CheckPage(pHints);
+      }
+      m_docStatus = PDF_DATAAVAIL_PAGE_LATERLOAD;
+      return TRUE;
+    case PDF_DATAAVAIL_ERROR:
+      return LoadAllFile(pHints);
+    case PDF_DATAAVAIL_PAGE_LATERLOAD:
+      m_docStatus = PDF_DATAAVAIL_PAGE;
+    default:
+      m_bDocAvail = TRUE;
+      return TRUE;
+  }
+}
+FX_BOOL CPDF_DataAvail::CheckPageStatus(IFX_DownloadHints* pHints) {
+  switch (m_docStatus) {
+    case PDF_DATAAVAIL_PAGETREE:
+      return CheckPages(pHints);
+    case PDF_DATAAVAIL_PAGE:
+      return CheckPage(pHints);
+    case PDF_DATAAVAIL_ERROR:
+      return LoadAllFile(pHints);
+    default:
+      m_bPagesTreeLoad = TRUE;
+      m_bPagesLoad = TRUE;
+      return TRUE;
+  }
+}
+FX_BOOL CPDF_DataAvail::LoadAllFile(IFX_DownloadHints* pHints) {
+  if (m_pFileAvail->IsDataAvail(0, (FX_DWORD)m_dwFileLen)) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+    return TRUE;
+  }
+  pHints->AddSegment(0, (FX_DWORD)m_dwFileLen);
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::LoadAllXref(IFX_DownloadHints* pHints) {
+  m_parser.m_Syntax.InitParser(m_pFileRead, (FX_DWORD)m_dwHeaderOffset);
+  m_parser.m_bOwnFileRead = FALSE;
+  if (!m_parser.LoadAllCrossRefV4(m_dwLastXRefOffset) &&
+      !m_parser.LoadAllCrossRefV5(m_dwLastXRefOffset)) {
+    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+    return FALSE;
+  }
+  FXSYS_qsort(m_parser.m_SortedOffset.GetData(),
+              m_parser.m_SortedOffset.GetSize(), sizeof(FX_FILESIZE),
+              _CompareFileSize);
+  m_dwRootObjNum = m_parser.GetRootObjNum();
+  m_dwInfoObjNum = m_parser.GetInfoObjNum();
+  m_pCurrentParser = &m_parser;
+  m_docStatus = PDF_DATAAVAIL_ROOT;
+  return TRUE;
+}
+CPDF_Object* CPDF_DataAvail::GetObject(FX_DWORD objnum,
+                                       IFX_DownloadHints* pHints,
+                                       FX_BOOL* pExistInFile) {
+  CPDF_Object* pRet = nullptr;
+  FX_DWORD size = 0;
+  FX_FILESIZE offset = 0;
+  CPDF_Parser* pParser = nullptr;
+  if (pExistInFile)
+    *pExistInFile = TRUE;
+
+  if (m_pDocument == NULL) {
+    size = (FX_DWORD)m_parser.GetObjectSize(objnum);
+    offset = m_parser.GetObjectOffset(objnum);
+    pParser = &m_parser;
+  } else {
+    size = GetObjectSize(objnum, offset);
+    pParser = (CPDF_Parser*)(m_pDocument->GetParser());
+  }
+  if (!IsDataAvail(offset, size, pHints)) {
+    return nullptr;
+  }
+  if (pParser) {
+    pRet = pParser->ParseIndirectObject(NULL, objnum, NULL);
+  }
+  if (!pRet && pExistInFile) {
+    *pExistInFile = FALSE;
+  }
+  return pRet;
+}
+FX_BOOL CPDF_DataAvail::CheckInfo(IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  CPDF_Object* pInfo = GetObject(m_dwInfoObjNum, pHints, &bExist);
+  if (!bExist) {
+    if (m_bHaveAcroForm) {
+      m_docStatus = PDF_DATAAVAIL_ACROFORM;
+    } else {
+      m_docStatus = PDF_DATAAVAIL_PAGETREE;
+    }
+    return TRUE;
+  }
+  if (!pInfo) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      return TRUE;
+    }
+    if (m_Pos == m_dwFileLen) {
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+    }
+    return FALSE;
+  }
+  if (pInfo) {
+    pInfo->Release();
+  }
+  if (m_bHaveAcroForm) {
+    m_docStatus = PDF_DATAAVAIL_ACROFORM;
+  } else {
+    m_docStatus = PDF_DATAAVAIL_PAGETREE;
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckRoot(IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  m_pRoot = GetObject(m_dwRootObjNum, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+    return TRUE;
+  }
+  if (!m_pRoot) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      return TRUE;
+    }
+    return FALSE;
+  }
+  CPDF_Dictionary* pDict = m_pRoot->GetDict();
+  if (!pDict) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  CPDF_Reference* pRef = (CPDF_Reference*)pDict->GetElement(FX_BSTRC("Pages"));
+  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  m_PagesObjNum = pRef->GetRefObjNum();
+  CPDF_Reference* pAcroFormRef =
+      (CPDF_Reference*)m_pRoot->GetDict()->GetElement(FX_BSTRC("AcroForm"));
+  if (pAcroFormRef && pAcroFormRef->GetType() == PDFOBJ_REFERENCE) {
+    m_bHaveAcroForm = TRUE;
+    m_dwAcroFormObjNum = pAcroFormRef->GetRefObjNum();
+  }
+  if (m_dwInfoObjNum) {
+    m_docStatus = PDF_DATAAVAIL_INFO;
+  } else {
+    if (m_bHaveAcroForm) {
+      m_docStatus = PDF_DATAAVAIL_ACROFORM;
+    } else {
+      m_docStatus = PDF_DATAAVAIL_PAGETREE;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::PreparePageItem() {
+  CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
+  CPDF_Reference* pRef =
+      pRoot ? (CPDF_Reference*)pRoot->GetElement(FX_BSTRC("Pages")) : NULL;
+  if (pRef == NULL || pRef->GetType() != PDFOBJ_REFERENCE) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  m_PagesObjNum = pRef->GetRefObjNum();
+  m_pCurrentParser = (CPDF_Parser*)m_pDocument->GetParser();
+  m_docStatus = PDF_DATAAVAIL_PAGETREE;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::IsFirstCheck(int iPage) {
+  if (m_pageMapCheckState.find(iPage) != m_pageMapCheckState.end())
+    return FALSE;
+
+  m_pageMapCheckState.insert(iPage);
+  return TRUE;
+}
+void CPDF_DataAvail::ResetFirstCheck(int iPage) {
+  m_pageMapCheckState.erase(iPage);
+}
+FX_BOOL CPDF_DataAvail::CheckPage(IFX_DownloadHints* pHints) {
+  FX_DWORD iPageObjs = m_PageObjList.GetSize();
+  CFX_DWordArray UnavailObjList;
+  for (FX_DWORD i = 0; i < iPageObjs; ++i) {
+    FX_DWORD dwPageObjNum = m_PageObjList.GetAt(i);
+    FX_BOOL bExist = FALSE;
+    CPDF_Object* pObj = GetObject(dwPageObjNum, pHints, &bExist);
+    if (!pObj) {
+      if (bExist) {
+        UnavailObjList.Add(dwPageObjNum);
+      }
+      continue;
+    }
+    if (pObj->GetType() == PDFOBJ_ARRAY) {
+      CPDF_Array* pArray = pObj->GetArray();
+      if (pArray) {
+        int32_t iSize = pArray->GetCount();
+        CPDF_Object* pItem = NULL;
+        for (int32_t j = 0; j < iSize; ++j) {
+          pItem = pArray->GetElement(j);
+          if (pItem && pItem->GetType() == PDFOBJ_REFERENCE) {
+            UnavailObjList.Add(((CPDF_Reference*)pItem)->GetRefObjNum());
+          }
+        }
+      }
+    }
+    if (pObj->GetType() != PDFOBJ_DICTIONARY) {
+      pObj->Release();
+      continue;
+    }
+    CFX_ByteString type = pObj->GetDict()->GetString(FX_BSTRC("Type"));
+    if (type == FX_BSTRC("Pages")) {
+      m_PagesArray.Add(pObj);
+      continue;
+    }
+    pObj->Release();
+  }
+  m_PageObjList.RemoveAll();
+  if (UnavailObjList.GetSize()) {
+    m_PageObjList.Append(UnavailObjList);
+    return FALSE;
+  }
+  FX_DWORD iPages = m_PagesArray.GetSize();
+  for (FX_DWORD i = 0; i < iPages; i++) {
+    CPDF_Object* pPages = (CPDF_Object*)m_PagesArray.GetAt(i);
+    if (!pPages) {
+      continue;
+    }
+    if (!GetPageKids(m_pCurrentParser, pPages)) {
+      pPages->Release();
+      while (++i < iPages) {
+        pPages = (CPDF_Object*)m_PagesArray.GetAt(i);
+        pPages->Release();
+      }
+      m_PagesArray.RemoveAll();
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+      return FALSE;
+    }
+    pPages->Release();
+  }
+  m_PagesArray.RemoveAll();
+  if (!m_PageObjList.GetSize()) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::GetPageKids(CPDF_Parser* pParser, CPDF_Object* pPages) {
+  if (!pParser) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  CPDF_Dictionary* pDict = pPages->GetDict();
+  CPDF_Object* pKids = pDict ? pDict->GetElement(FX_BSTRC("Kids")) : NULL;
+  if (!pKids) {
+    return TRUE;
+  }
+  switch (pKids->GetType()) {
+    case PDFOBJ_REFERENCE: {
+      CPDF_Reference* pKid = (CPDF_Reference*)pKids;
+      m_PageObjList.Add(pKid->GetRefObjNum());
+    } break;
+    case PDFOBJ_ARRAY: {
+      CPDF_Array* pKidsArray = (CPDF_Array*)pKids;
+      for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
+        CPDF_Object* pKid = (CPDF_Object*)pKidsArray->GetElement(i);
+        if (pKid && pKid->GetType() == PDFOBJ_REFERENCE) {
+          m_PageObjList.Add(((CPDF_Reference*)pKid)->GetRefObjNum());
+        }
+      }
+    } break;
+    default:
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+      return FALSE;
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckPages(IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+    return TRUE;
+  }
+  if (!pPages) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      return TRUE;
+    }
+    return FALSE;
+  }
+  if (!GetPageKids(m_pCurrentParser, pPages)) {
+    pPages->Release();
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  pPages->Release();
+  m_docStatus = PDF_DATAAVAIL_PAGE;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckHeader(IFX_DownloadHints* pHints) {
+  FX_DWORD req_size = 1024;
+  if ((FX_FILESIZE)req_size > m_dwFileLen) {
+    req_size = (FX_DWORD)m_dwFileLen;
+  }
+  if (m_pFileAvail->IsDataAvail(0, req_size)) {
+    uint8_t buffer[1024];
+    m_pFileRead->ReadBlock(buffer, 0, req_size);
+    if (IsLinearizedFile(buffer, req_size)) {
+      m_docStatus = PDF_DATAAVAIL_FIRSTPAGE;
+    } else {
+      if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+        return FALSE;
+      }
+      m_docStatus = PDF_DATAAVAIL_END;
+    }
+    return TRUE;
+  }
+  pHints->AddSegment(0, req_size);
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::CheckFirstPage(IFX_DownloadHints* pHints) {
+  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
+  CPDF_Object* pEndOffSet = pDict ? pDict->GetElement(FX_BSTRC("E")) : NULL;
+  if (!pEndOffSet) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  CPDF_Object* pXRefOffset = pDict ? pDict->GetElement(FX_BSTRC("T")) : NULL;
+  if (!pXRefOffset) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  CPDF_Object* pFileLen = pDict ? pDict->GetElement(FX_BSTRC("L")) : NULL;
+  if (!pFileLen) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  FX_BOOL bNeedDownLoad = FALSE;
+  if (pEndOffSet->GetType() == PDFOBJ_NUMBER) {
+    FX_DWORD dwEnd = pEndOffSet->GetInteger();
+    dwEnd += 512;
+    if ((FX_FILESIZE)dwEnd > m_dwFileLen) {
+      dwEnd = (FX_DWORD)m_dwFileLen;
+    }
+    int32_t iStartPos = (int32_t)(m_dwFileLen > 1024 ? 1024 : m_dwFileLen);
+    int32_t iSize = dwEnd > 1024 ? dwEnd - 1024 : 0;
+    if (!m_pFileAvail->IsDataAvail(iStartPos, iSize)) {
+      pHints->AddSegment(iStartPos, iSize);
+      bNeedDownLoad = TRUE;
+    }
+  }
+  m_dwLastXRefOffset = 0;
+  FX_FILESIZE dwFileLen = 0;
+  if (pXRefOffset->GetType() == PDFOBJ_NUMBER) {
+    m_dwLastXRefOffset = pXRefOffset->GetInteger();
+  }
+  if (pFileLen->GetType() == PDFOBJ_NUMBER) {
+    dwFileLen = pFileLen->GetInteger();
+  }
+  if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
+                                 (FX_DWORD)(dwFileLen - m_dwLastXRefOffset))) {
+    if (m_docStatus == PDF_DATAAVAIL_FIRSTPAGE) {
+      FX_DWORD dwSize = (FX_DWORD)(dwFileLen - m_dwLastXRefOffset);
+      FX_FILESIZE offset = m_dwLastXRefOffset;
+      if (dwSize < 512 && dwFileLen > 512) {
+        dwSize = 512;
+        offset = dwFileLen - 512;
+      }
+      pHints->AddSegment(offset, dwSize);
+    }
+  } else {
+    m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
+  }
+  if (bNeedDownLoad || m_docStatus != PDF_DATAAVAIL_FIRSTPAGE_PREPARE) {
+    m_docStatus = PDF_DATAAVAIL_FIRSTPAGE_PREPARE;
+    return FALSE;
+  }
+  m_docStatus =
+      m_bSupportHintTable ? PDF_DATAAVAIL_HINTTABLE : PDF_DATAAVAIL_DONE;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::IsDataAvail(FX_FILESIZE offset,
+                                    FX_DWORD size,
+                                    IFX_DownloadHints* pHints) {
+  if (!pHints || offset > m_dwFileLen) {
+    return TRUE;
+  }
+  FX_SAFE_DWORD safeSize = pdfium::base::checked_cast<FX_DWORD>(offset);
+  safeSize += size;
+  safeSize += 512;
+  if (!safeSize.IsValid()) {
+    return TRUE;
+  }
+  if (safeSize.ValueOrDie() > m_dwFileLen) {
+    size = m_dwFileLen - offset;
+  } else {
+    size += 512;
+  }
+  if (!m_pFileAvail->IsDataAvail(offset, size)) {
+    pHints->AddSegment(offset, size);
+    return FALSE;
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckHintTables(IFX_DownloadHints* pHints) {
+  CPDF_Dictionary* pDict = m_pLinearized->GetDict();
+  if (!pDict || !pHints) {
+    return TRUE;
+  }
+  if (!pDict->KeyExist(FX_BSTRC("H")) || !pDict->KeyExist(FX_BSTRC("O")) ||
+      !pDict->KeyExist(FX_BSTRC("N"))) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+    return TRUE;
+  }
+  int nPageCount = pDict->GetElementValue(FX_BSTRC("N"))->GetInteger();
+  if (nPageCount <= 1) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+    return TRUE;
+  }
+  CPDF_Array* pHintStreamRange = pDict->GetArray(FX_BSTRC("H"));
+  FX_FILESIZE szHSStart, szHSLength;

[Tom Sepez, 2015/09/22 00:05:39]

nit: one per line, combine declaration and initialization below.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  szHSStart = pHintStreamRange->GetElementValue(0)
+                  ? pHintStreamRange->GetElementValue(0)->GetInteger()
+                  : 0;
+  szHSLength = pHintStreamRange->GetElementValue(1)
+                   ? pHintStreamRange->GetElementValue(1)->GetInteger()
+                   : 0;
+  if (szHSStart < 0 || szHSLength <= 0) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+    return TRUE;
+  }
+  if (!IsDataAvail(szHSStart, szHSLength, pHints)) {
+    return FALSE;
+  }
+  m_syntaxParser.InitParser(m_pFileRead, m_dwHeaderOffset);
+  CPDF_HintTables* pHintTables = new CPDF_HintTables(this, pDict);

[Tom Sepez, 2015/09/22 00:05:39]

nit: unique_ptr<> might help here, as well.

[jun_fang, 2015/09/22 12:42:32]

If we define pHintTables and m_pHintTables like below:
nonstd::unique_ptr<CPDF_HintTables> pHintTables;
nonstd::unique_ptr<CPDF_HintTables> m_pHintTables;

There is no way to assign pHintTables to m_pHintTables.

[Tom Sepez, 2015/09/22 15:16:43]

See nonstd::move() (recently added) (a websearch on std::move() will give some
background).

+  CPDF_Stream* pHintStream = (CPDF_Stream*)ParseIndirectObjectAt(szHSStart, 0);
+  if (!pHintStream || pHintStream->GetType() != PDFOBJ_STREAM) {
+    delete pHintTables;
+    pHintTables = NULL;
+  }
+  if (pHintTables && !pHintTables->LoadHintStream(pHintStream)) {
+    delete pHintTables;
+    pHintTables = NULL;
+  }
+  m_pHintTables = pHintTables;
+  m_docStatus = PDF_DATAAVAIL_DONE;
+  return TRUE;
+}
+CPDF_Object* CPDF_DataAvail::ParseIndirectObjectAt(
+    FX_FILESIZE pos,
+    FX_DWORD objnum,
+    CPDF_IndirectObjects* pObjList) {
+  FX_FILESIZE SavedPos = m_syntaxParser.SavePos();
+  m_syntaxParser.RestorePos(pos);
+  FX_BOOL bIsNumber;
+  CFX_ByteString word = m_syntaxParser.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    return NULL;
+  }
+  FX_DWORD parser_objnum = FXSYS_atoi(word);
+  if (objnum && parser_objnum != objnum) {
+    return NULL;
+  }
+  word = m_syntaxParser.GetNextWord(bIsNumber);
+  if (!bIsNumber) {
+    return NULL;
+  }
+  FX_DWORD gennum = FXSYS_atoi(word);
+  if (m_syntaxParser.GetKeyword() != FX_BSTRC("obj")) {
+    m_syntaxParser.RestorePos(SavedPos);
+    return NULL;
+  }
+  CPDF_Object* pObj =
+      m_syntaxParser.GetObject(pObjList, parser_objnum, gennum, 0);
+  m_syntaxParser.RestorePos(SavedPos);
+  return pObj;
+}
+int32_t CPDF_DataAvail::IsLinearizedPDF() {
+  FX_DWORD req_size = 1024;
+  if (!m_pFileAvail->IsDataAvail(0, req_size)) {
+    return PDF_UNKNOW_LINEARIZED;
+  }
+  if (!m_pFileRead) {
+    return PDF_NOT_LINEARIZED;
+  }
+  FX_FILESIZE dwSize = m_pFileRead->GetSize();
+  if (dwSize < (FX_FILESIZE)req_size) {
+    return PDF_UNKNOW_LINEARIZED;
+  }
+  uint8_t buffer[1024];
+  m_pFileRead->ReadBlock(buffer, 0, req_size);
+  if (IsLinearizedFile(buffer, req_size)) {
+    return PDF_IS_LINEARIZED;
+  }
+  return PDF_NOT_LINEARIZED;
+}
+FX_BOOL CPDF_DataAvail::IsLinearizedFile(uint8_t* pData, FX_DWORD dwLen) {
+  CFX_SmartPointer<IFX_FileStream> file(
+      FX_CreateMemoryStream(pData, (size_t)dwLen, FALSE));
+  int32_t offset = GetHeaderOffset(file.Get());
+  if (offset == -1) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  m_dwHeaderOffset = offset;
+  m_syntaxParser.InitParser(file.Get(), offset);
+  m_syntaxParser.RestorePos(m_syntaxParser.m_HeaderOffset + 9);
+  FX_BOOL bNumber = FALSE;
+  CFX_ByteString wordObjNum = m_syntaxParser.GetNextWord(bNumber);
+  if (!bNumber) {
+    return FALSE;
+  }
+  FX_DWORD objnum = FXSYS_atoi(wordObjNum);
+  if (m_pLinearized) {
+    m_pLinearized->Release();
+    m_pLinearized = NULL;
+  }
+  m_pLinearized =
+      ParseIndirectObjectAt(m_syntaxParser.m_HeaderOffset + 9, objnum);
+  if (!m_pLinearized) {
+    return FALSE;
+  }
+  if (m_pLinearized->GetDict() &&
+      m_pLinearized->GetDict()->GetElement(FX_BSTRC("Linearized"))) {
+    CPDF_Object* pLen = m_pLinearized->GetDict()->GetElement(FX_BSTRC("L"));
+    if (!pLen) {
+      return FALSE;
+    }
+    if ((FX_FILESIZE)pLen->GetInteger() != m_pFileRead->GetSize()) {
+      return FALSE;
+    }
+    m_bLinearized = TRUE;
+    CPDF_Object* pNo = m_pLinearized->GetDict()->GetElement(FX_BSTRC("P"));
+    if (pNo && pNo->GetType() == PDFOBJ_NUMBER) {
+      m_dwFirstPageNo = pNo->GetInteger();
+    }
+    return TRUE;
+  }
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::CheckEnd(IFX_DownloadHints* pHints) {
+  FX_DWORD req_pos = (FX_DWORD)(m_dwFileLen > 1024 ? m_dwFileLen - 1024 : 0);
+  FX_DWORD dwSize = (FX_DWORD)(m_dwFileLen - req_pos);
+  if (m_pFileAvail->IsDataAvail(req_pos, dwSize)) {
+    uint8_t buffer[1024];
+    m_pFileRead->ReadBlock(buffer, req_pos, dwSize);
+    CFX_SmartPointer<IFX_FileStream> file(
+        FX_CreateMemoryStream(buffer, (size_t)dwSize, FALSE));
+    m_syntaxParser.InitParser(file.Get(), 0);
+    m_syntaxParser.RestorePos(dwSize - 1);
+    if (m_syntaxParser.SearchWord(FX_BSTRC("startxref"), TRUE, FALSE, dwSize)) {
+      FX_BOOL bNumber;
+      m_syntaxParser.GetNextWord(bNumber);
+      CFX_ByteString xrefpos_str = m_syntaxParser.GetNextWord(bNumber);
+      if (!bNumber) {
+        m_docStatus = PDF_DATAAVAIL_ERROR;
+        return FALSE;
+      }
+      m_dwXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str);
+      if (!m_dwXRefOffset || m_dwXRefOffset > m_dwFileLen) {
+        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+        return TRUE;
+      }
+      m_dwLastXRefOffset = m_dwXRefOffset;
+      SetStartOffset(m_dwXRefOffset);
+      m_docStatus = PDF_DATAAVAIL_CROSSREF;
+      return TRUE;
+    }
+    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+    return TRUE;
+  }
+  pHints->AddSegment(req_pos, dwSize);
+  return FALSE;
+}
+int32_t CPDF_DataAvail::CheckCrossRefStream(IFX_DownloadHints* pHints,
+                                            FX_FILESIZE& xref_offset) {
+  xref_offset = 0;
+  FX_DWORD req_size =
+      (FX_DWORD)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
+  if (m_pFileAvail->IsDataAvail(m_Pos, req_size)) {
+    int32_t iSize = (int32_t)(m_Pos + req_size - m_dwCurrentXRefSteam);
+    CFX_BinaryBuf buf(iSize);
+    uint8_t* pBuf = buf.GetBuffer();
+    m_pFileRead->ReadBlock(pBuf, m_dwCurrentXRefSteam, iSize);
+    CFX_SmartPointer<IFX_FileStream> file(
+        FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
+    m_parser.m_Syntax.InitParser(file.Get(), 0);
+    FX_BOOL bNumber = FALSE;
+    CFX_ByteString objnum = m_parser.m_Syntax.GetNextWord(bNumber);
+    if (!bNumber) {
+      return -1;
+    }
+    FX_DWORD objNum = FXSYS_atoi(objnum);
+    CPDF_Object* pObj = m_parser.ParseIndirectObjectAt(NULL, 0, objNum, NULL);
+    if (!pObj) {
+      m_Pos += m_parser.m_Syntax.SavePos();
+      return 0;
+    }
+    CPDF_Dictionary* pDict = pObj->GetDict();
+    CPDF_Object* pName = pDict ? pDict->GetElement(FX_BSTRC("Type")) : NULL;
+    if (pName && pName->GetType() == PDFOBJ_NAME) {
+      if (pName->GetString() == FX_BSTRC("XRef")) {
+        m_Pos += m_parser.m_Syntax.SavePos();
+        xref_offset = pObj->GetDict()->GetInteger(FX_BSTRC("Prev"));
+        pObj->Release();
+        return 1;
+      }
+    }
+    pObj->Release();
+    return -1;
+  }
+  pHints->AddSegment(m_Pos, req_size);
+  return 0;
+}
+inline void CPDF_DataAvail::SetStartOffset(FX_FILESIZE dwOffset) {
+  m_Pos = dwOffset;
+}
+#define MAX_WORD_BUFFER 256
+FX_BOOL CPDF_DataAvail::GetNextToken(CFX_ByteString& token) {
+  m_WordSize = 0;
+  uint8_t ch;
+  if (!GetNextChar(ch)) {
+    return FALSE;
+  }
+  uint8_t type = PDF_CharType[ch];
+  while (1) {
+    while (type == 'W') {
+      if (!GetNextChar(ch)) {
+        return FALSE;
+      }
+      type = PDF_CharType[ch];
+    }
+    if (ch != '%') {
+      break;
+    }
+    while (1) {
+      if (!GetNextChar(ch)) {
+        return FALSE;
+      }
+      if (ch == '\r' || ch == '\n') {
+        break;
+      }
+    }
+    type = PDF_CharType[ch];
+  }
+  if (type == 'D') {
+    m_WordBuffer[m_WordSize++] = ch;
+    if (ch == '/') {
+      while (1) {
+        if (!GetNextChar(ch)) {
+          return FALSE;
+        }
+        type = PDF_CharType[ch];
+        if (type != 'R' && type != 'N') {
+          m_Pos--;
+          CFX_ByteString ret(m_WordBuffer, m_WordSize);
+          token = ret;
+          return TRUE;
+        }
+        if (m_WordSize < MAX_WORD_BUFFER) {
+          m_WordBuffer[m_WordSize++] = ch;
+        }
+      }
+    } else if (ch == '<') {
+      if (!GetNextChar(ch)) {
+        return FALSE;
+      }
+      if (ch == '<') {
+        m_WordBuffer[m_WordSize++] = ch;
+      } else {
+        m_Pos--;
+      }
+    } else if (ch == '>') {
+      if (!GetNextChar(ch)) {
+        return FALSE;
+      }
+      if (ch == '>') {
+        m_WordBuffer[m_WordSize++] = ch;
+      } else {
+        m_Pos--;
+      }
+    }
+    CFX_ByteString ret(m_WordBuffer, m_WordSize);
+    token = ret;
+    return TRUE;
+  }
+  while (1) {
+    if (m_WordSize < MAX_WORD_BUFFER) {
+      m_WordBuffer[m_WordSize++] = ch;
+    }
+    if (!GetNextChar(ch)) {
+      return FALSE;
+    }
+    type = PDF_CharType[ch];
+    if (type == 'D' || type == 'W') {
+      m_Pos--;
+      break;
+    }
+  }
+  CFX_ByteString ret(m_WordBuffer, m_WordSize);
+  token = ret;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::GetNextChar(uint8_t& ch) {
+  FX_FILESIZE pos = m_Pos;
+  if (pos >= m_dwFileLen) {
+    return FALSE;
+  }
+  if (m_bufferOffset >= pos ||
+      (FX_FILESIZE)(m_bufferOffset + m_bufferSize) <= pos) {
+    FX_FILESIZE read_pos = pos;
+    FX_DWORD read_size = 512;
+    if ((FX_FILESIZE)read_size > m_dwFileLen) {
+      read_size = (FX_DWORD)m_dwFileLen;
+    }
+    if ((FX_FILESIZE)(read_pos + read_size) > m_dwFileLen) {
+      read_pos = m_dwFileLen - read_size;
+    }
+    if (!m_pFileRead->ReadBlock(m_bufferData, read_pos, read_size)) {
+      return FALSE;
+    }
+    m_bufferOffset = read_pos;
+    m_bufferSize = read_size;
+  }
+  ch = m_bufferData[pos - m_bufferOffset];
+  m_Pos++;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckCrossRefItem(IFX_DownloadHints* pHints) {
+  int32_t iSize = 0;
+  CFX_ByteString token;
+  while (1) {
+    if (!GetNextToken(token)) {
+      iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
+      pHints->AddSegment(m_Pos, iSize);
+      return FALSE;
+    }
+    if (token == "trailer") {
+      m_dwTrailerOffset = m_Pos;
+      m_docStatus = PDF_DATAAVAIL_TRAILER;
+      return TRUE;
+    }
+  }
+}
+FX_BOOL CPDF_DataAvail::CheckAllCrossRefStream(IFX_DownloadHints* pHints) {
+  FX_FILESIZE xref_offset = 0;
+  int32_t nRet = CheckCrossRefStream(pHints, xref_offset);
+  if (nRet == 1) {
+    if (!xref_offset) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLCRSOSSREF;
+    } else {
+      m_dwCurrentXRefSteam = xref_offset;
+      m_Pos = xref_offset;
+    }
+    return TRUE;
+  }
+  if (nRet == -1) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+  }
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::CheckCrossRef(IFX_DownloadHints* pHints) {
+  int32_t iSize = 0;
+  CFX_ByteString token;
+  if (!GetNextToken(token)) {
+    iSize = (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
+    pHints->AddSegment(m_Pos, iSize);
+    return FALSE;
+  }
+  if (token == "xref") {
+    m_CrossOffset.InsertAt(0, m_dwXRefOffset);
+    while (1) {
+      if (!GetNextToken(token)) {
+        iSize =
+            (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
+        pHints->AddSegment(m_Pos, iSize);
+        m_docStatus = PDF_DATAAVAIL_CROSSREF_ITEM;
+        return FALSE;
+      }
+      if (token == "trailer") {
+        m_dwTrailerOffset = m_Pos;
+        m_docStatus = PDF_DATAAVAIL_TRAILER;
+        return TRUE;
+      }
+    }
+  } else {
+    m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+    return TRUE;
+  }
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::CheckTrailerAppend(IFX_DownloadHints* pHints) {
+  if (m_Pos < m_dwFileLen) {
+    FX_FILESIZE dwAppendPos = m_Pos + m_syntaxParser.SavePos();
+    int32_t iSize = (int32_t)(
+        dwAppendPos + 512 > m_dwFileLen ? m_dwFileLen - dwAppendPos : 512);
+    if (!m_pFileAvail->IsDataAvail(dwAppendPos, iSize)) {
+      pHints->AddSegment(dwAppendPos, iSize);
+      return FALSE;
+    }
+  }
+  if (m_dwPrevXRefOffset) {
+    SetStartOffset(m_dwPrevXRefOffset);
+    m_docStatus = PDF_DATAAVAIL_CROSSREF;
+  } else {
+    m_docStatus = PDF_DATAAVAIL_LOADALLCRSOSSREF;
+  }
+  return TRUE;
+}
+
+FX_BOOL CPDF_DataAvail::CheckTrailer(IFX_DownloadHints* pHints) {
+  int32_t iTrailerSize =
+      (int32_t)(m_Pos + 512 > m_dwFileLen ? m_dwFileLen - m_Pos : 512);
+  if (m_pFileAvail->IsDataAvail(m_Pos, iTrailerSize)) {
+    int32_t iSize = (int32_t)(m_Pos + iTrailerSize - m_dwTrailerOffset);
+    CFX_BinaryBuf buf(iSize);
+    uint8_t* pBuf = buf.GetBuffer();
+    if (!pBuf) {
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+      return FALSE;
+    }
+    if (!m_pFileRead->ReadBlock(pBuf, m_dwTrailerOffset, iSize)) {
+      return FALSE;
+    }
+    CFX_SmartPointer<IFX_FileStream> file(
+        FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
+    m_syntaxParser.InitParser(file.Get(), 0);
+    CPDF_Object* pTrailer = m_syntaxParser.GetObject(nullptr, 0, 0);
+    if (!pTrailer) {
+      m_Pos += m_syntaxParser.SavePos();
+      pHints->AddSegment(m_Pos, iTrailerSize);
+      return FALSE;
+    }
+    if (pTrailer->GetType() != PDFOBJ_DICTIONARY) {
+      pTrailer->Release();
+      return FALSE;
+    }
+    CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
+    CPDF_Object* pEncrypt = pTrailerDict->GetElement("Encrypt");
+    if (pEncrypt && pEncrypt->GetType() == PDFOBJ_REFERENCE) {
+      m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      pTrailer->Release();
+      return TRUE;
+    }
+    FX_DWORD xrefpos = GetDirectInteger(pTrailer->GetDict(), FX_BSTRC("Prev"));
+    if (xrefpos) {
+      m_dwPrevXRefOffset =
+          GetDirectInteger(pTrailer->GetDict(), FX_BSTRC("XRefStm"));
+      pTrailer->Release();
+      if (m_dwPrevXRefOffset) {
+        m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+      } else {
+        m_dwPrevXRefOffset = xrefpos;
+        if (m_dwPrevXRefOffset >= m_dwFileLen) {
+          m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
+        } else {
+          SetStartOffset(m_dwPrevXRefOffset);
+          m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
+        }
+      }
+      return TRUE;
+    }
+    m_dwPrevXRefOffset = 0;
+    m_docStatus = PDF_DATAAVAIL_TRAILER_APPEND;
+    pTrailer->Release();
+    return TRUE;
+  }
+  pHints->AddSegment(m_Pos, iTrailerSize);
+  return FALSE;
+}
+
+FX_BOOL CPDF_DataAvail::CheckPage(int32_t iPage, IFX_DownloadHints* pHints) {
+  while (TRUE) {
+    switch (m_docStatus) {
+      case PDF_DATAAVAIL_PAGETREE:
+        if (!LoadDocPages(pHints)) {
+          return FALSE;
+        }
+        break;
+      case PDF_DATAAVAIL_PAGE:
+        if (!LoadDocPage(iPage, pHints)) {
+          return FALSE;
+        }
+        break;
+      case PDF_DATAAVAIL_ERROR:
+        return LoadAllFile(pHints);
+      default:
+        m_bPagesTreeLoad = TRUE;
+        m_bPagesLoad = TRUE;
+        m_bCurPageDictLoadOK = TRUE;
+        m_docStatus = PDF_DATAAVAIL_PAGE;
+        return TRUE;
+    }
+  }
+}
+FX_BOOL CPDF_DataAvail::CheckArrayPageNode(FX_DWORD dwPageNo,
+                                           CPDF_PageNode* pPageNode,
+                                           IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  CPDF_Object* pPages = GetObject(dwPageNo, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  if (!pPages) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+      return FALSE;
+    }
+    return FALSE;
+  }
+  if (pPages->GetType() != PDFOBJ_ARRAY) {
+    pPages->Release();
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  pPageNode->m_type = PDF_PAGENODE_PAGES;
+  CPDF_Array* pArray = (CPDF_Array*)pPages;
+  for (FX_DWORD i = 0; i < pArray->GetCount(); ++i) {
+    CPDF_Object* pKid = (CPDF_Object*)pArray->GetElement(i);
+    if (!pKid || pKid->GetType() != PDFOBJ_REFERENCE) {
+      continue;
+    }
+    CPDF_PageNode* pNode = new CPDF_PageNode();
+    pPageNode->m_childNode.Add(pNode);
+    pNode->m_dwPageNo = ((CPDF_Reference*)pKid)->GetRefObjNum();
+  }
+  pPages->Release();
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckUnkownPageNode(FX_DWORD dwPageNo,
+                                            CPDF_PageNode* pPageNode,
+                                            IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  CPDF_Object* pPage = GetObject(dwPageNo, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  if (!pPage) {
+    if (m_docStatus == PDF_DATAAVAIL_ERROR) {
+      m_docStatus = PDF_DATAAVAIL_ERROR;
+      return FALSE;
+    }
+    return FALSE;
+  }
+  if (pPage->GetType() == PDFOBJ_ARRAY) {
+    pPageNode->m_dwPageNo = dwPageNo;
+    pPageNode->m_type = PDF_PAGENODE_ARRAY;
+    pPage->Release();
+    return TRUE;
+  }
+  if (pPage->GetType() != PDFOBJ_DICTIONARY) {
+    pPage->Release();
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  pPageNode->m_dwPageNo = dwPageNo;
+  CPDF_Dictionary* pDict = pPage->GetDict();
+  CFX_ByteString type = pDict->GetString(FX_BSTRC("Type"));
+  if (type == FX_BSTRC("Pages")) {
+    pPageNode->m_type = PDF_PAGENODE_PAGES;
+    CPDF_Object* pKids = pDict->GetElement(FX_BSTRC("Kids"));
+    if (!pKids) {
+      m_docStatus = PDF_DATAAVAIL_PAGE;
+      return TRUE;
+    }
+    switch (pKids->GetType()) {
+      case PDFOBJ_REFERENCE: {
+        CPDF_Reference* pKid = (CPDF_Reference*)pKids;
+        CPDF_PageNode* pNode = new CPDF_PageNode();
+        pPageNode->m_childNode.Add(pNode);
+        pNode->m_dwPageNo = pKid->GetRefObjNum();
+      } break;
+      case PDFOBJ_ARRAY: {
+        CPDF_Array* pKidsArray = (CPDF_Array*)pKids;
+        for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
+          CPDF_Object* pKid = (CPDF_Object*)pKidsArray->GetElement(i);
+          if (!pKid || pKid->GetType() != PDFOBJ_REFERENCE) {
+            continue;
+          }
+          CPDF_PageNode* pNode = new CPDF_PageNode();
+          pPageNode->m_childNode.Add(pNode);
+          pNode->m_dwPageNo = ((CPDF_Reference*)pKid)->GetRefObjNum();
+        }
+      } break;
+      default:
+        break;
+    }
+  } else if (type == FX_BSTRC("Page")) {
+    pPageNode->m_type = PDF_PAGENODE_PAGE;
+  } else {
+    pPage->Release();
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  pPage->Release();
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckPageNode(CPDF_PageNode& pageNodes,
+                                      int32_t iPage,
+                                      int32_t& iCount,
+                                      IFX_DownloadHints* pHints) {
+  int32_t iSize = pageNodes.m_childNode.GetSize();
+  if (iSize <= 0 || iPage >= iSize) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  for (int32_t i = 0; i < iSize; ++i) {
+    CPDF_PageNode* pNode = (CPDF_PageNode*)pageNodes.m_childNode.GetAt(i);
+    if (!pNode) {
+      continue;
+    }
+    switch (pNode->m_type) {
+      case PDF_PAGENODE_UNKOWN:
+        if (!CheckUnkownPageNode(pNode->m_dwPageNo, pNode, pHints)) {
+          return FALSE;
+        }
+        --i;
+        break;
+      case PDF_PAGENODE_PAGE:
+        iCount++;
+        if (iPage == iCount && m_pDocument) {
+          m_pDocument->m_PageList.SetAt(iPage, pNode->m_dwPageNo);
+        }
+        break;
+      case PDF_PAGENODE_PAGES:
+        if (!CheckPageNode(*pNode, iPage, iCount, pHints)) {
+          return FALSE;
+        }
+        break;
+      case PDF_PAGENODE_ARRAY:
+        if (!CheckArrayPageNode(pNode->m_dwPageNo, pNode, pHints)) {
+          return FALSE;
+        }
+        --i;
+        break;
+    }
+    if (iPage == iCount) {
+      m_docStatus = PDF_DATAAVAIL_DONE;
+      return TRUE;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::LoadDocPage(int32_t iPage, IFX_DownloadHints* pHints) {
+  if (m_pDocument->GetPageCount() <= iPage ||
+      m_pDocument->m_PageList.GetAt(iPage)) {
+    m_docStatus = PDF_DATAAVAIL_DONE;
+    return TRUE;
+  }
+  if (m_pageNodes.m_type == PDF_PAGENODE_PAGE) {
+    if (iPage == 0) {
+      m_docStatus = PDF_DATAAVAIL_DONE;
+      return TRUE;
+    }
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return TRUE;
+  }
+  int32_t iCount = -1;
+  return CheckPageNode(m_pageNodes, iPage, iCount, pHints);
+}
+FX_BOOL CPDF_DataAvail::CheckPageCount(IFX_DownloadHints* pHints) {
+  FX_BOOL bExist = FALSE;
+  CPDF_Object* pPages = GetObject(m_PagesObjNum, pHints, &bExist);
+  if (!bExist) {
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  if (!pPages) {
+    return FALSE;
+  }
+  CPDF_Dictionary* pPagesDict = pPages->GetDict();
+  if (!pPagesDict) {
+    pPages->Release();
+    m_docStatus = PDF_DATAAVAIL_ERROR;
+    return FALSE;
+  }
+  if (!pPagesDict->KeyExist(FX_BSTRC("Kids"))) {
+    pPages->Release();
+    return TRUE;
+  }
+  int count = pPagesDict->GetInteger(FX_BSTRC("Count"));
+  if (count > 0) {
+    pPages->Release();
+    return TRUE;
+  }
+  pPages->Release();
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::LoadDocPages(IFX_DownloadHints* pHints) {
+  if (!CheckUnkownPageNode(m_PagesObjNum, &m_pageNodes, pHints)) {
+    return FALSE;
+  }
+  if (CheckPageCount(pHints)) {
+    m_docStatus = PDF_DATAAVAIL_PAGE;
+    return TRUE;
+  }
+  m_bTotalLoadPageTree = TRUE;
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::LoadPages(IFX_DownloadHints* pHints) {
+  while (!m_bPagesTreeLoad) {
+    if (!CheckPageStatus(pHints)) {
+      return FALSE;
+    }
+  }
+  if (m_bPagesLoad) {
+    return TRUE;
+  }
+  m_pDocument->LoadPages();
+  return FALSE;
+}
+FX_BOOL CPDF_DataAvail::CheckLinearizedData(IFX_DownloadHints* pHints) {
+  if (m_bLinearedDataOK) {
+    return TRUE;
+  }
+
+  if (!m_bMainXRefLoadTried) {
+    FX_SAFE_DWORD data_size = m_dwFileLen;
+    data_size -= m_dwLastXRefOffset;
+    if (!data_size.IsValid()) {
+      return FALSE;
+    }
+    if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
+                                   data_size.ValueOrDie())) {
+      pHints->AddSegment(m_dwLastXRefOffset, data_size.ValueOrDie());
+      return FALSE;
+    }
+    FX_DWORD dwRet =
+        ((CPDF_Parser*)m_pDocument->GetParser())->LoadLinearizedMainXRefTable();
+    m_bMainXRefLoadTried = TRUE;
+    if (dwRet != PDFPARSE_ERROR_SUCCESS) {
+      return FALSE;
+    }
+    if (!PreparePageItem()) {
+      return FALSE;
+    }
+    m_bMainXRefLoadedOK = TRUE;
+    m_bLinearedDataOK = TRUE;
+  }
+
+  return m_bLinearedDataOK;
+}
+FX_BOOL CPDF_DataAvail::CheckPageAnnots(int32_t iPage,
+                                        IFX_DownloadHints* pHints) {
+  if (!m_objs_array.GetSize()) {
+    m_objs_array.RemoveAll();
+    m_objnum_array.RemoveAll();
+    CPDF_Dictionary* pPageDict = m_pDocument->GetPage(iPage);
+    if (!pPageDict) {
+      return TRUE;
+    }
+    CPDF_Object* pAnnots = pPageDict->GetElement(FX_BSTRC("Annots"));
+    if (!pAnnots) {
+      return TRUE;
+    }
+    CFX_PtrArray obj_array;
+    obj_array.Add(pAnnots);
+    FX_BOOL bRet = IsObjectsAvail(obj_array, FALSE, pHints, m_objs_array);
+    if (bRet) {
+      m_objs_array.RemoveAll();
+    }
+    return bRet;
+  }
+  CFX_PtrArray new_objs_array;
+  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+  m_objs_array.RemoveAll();
+  if (!bRet) {
+    m_objs_array.Append(new_objs_array);
+  }
+  return bRet;
+}
+FX_BOOL CPDF_DataAvail::CheckLinearizedFirstPage(int32_t iPage,
+                                                 IFX_DownloadHints* pHints) {
+  if (!m_bAnnotsLoad) {
+    if (!CheckPageAnnots(iPage, pHints)) {
+      return FALSE;
+    }
+    m_bAnnotsLoad = TRUE;
+  }
+  if (m_bAnnotsLoad) {
+    if (!CheckLinearizedData(pHints))
+      return FALSE;
+  }
+  m_bPageLoadedOK = FALSE;
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::HaveResourceAncestor(CPDF_Dictionary* pDict) {
+  CFX_AutoRestorer<int> restorer(&s_CurrentDataAvailRecursionDepth);
+  if (++s_CurrentDataAvailRecursionDepth > kMaxDataAvailRecursionDepth) {
+    return FALSE;
+  }
+  CPDF_Object* pParent = pDict->GetElement("Parent");
+  if (!pParent) {
+    return FALSE;
+  }
+  CPDF_Dictionary* pParentDict = pParent->GetDict();
+  if (!pParentDict) {
+    return FALSE;
+  }
+  CPDF_Object* pRet = pParentDict->GetElement("Resources");
+  if (pRet) {
+    m_pPageResource = pRet;
+    return TRUE;
+  }
+  return HaveResourceAncestor(pParentDict);
+}
+FX_BOOL CPDF_DataAvail::IsPageAvail(int32_t iPage, IFX_DownloadHints* pHints) {
+  if (!m_pDocument) {
+    return FALSE;
+  }
+  if (IsFirstCheck(iPage)) {
+    m_bCurPageDictLoadOK = FALSE;
+    m_bPageLoadedOK = FALSE;
+    m_bAnnotsLoad = FALSE;
+    m_bNeedDownLoadResource = FALSE;
+    m_objs_array.RemoveAll();
+    m_objnum_array.RemoveAll();
+  }
+  if (m_pagesLoadState.find(iPage) != m_pagesLoadState.end()) {
+    return TRUE;
+  }
+  if (m_bLinearized) {
+    if ((FX_DWORD)iPage == m_dwFirstPageNo) {
+      m_pagesLoadState.insert(iPage);
+      return TRUE;
+    }
+    if (!CheckLinearizedData(pHints)) {
+      return FALSE;
+    }
+    if (m_pHintTables) {
+      if (!m_pHintTables->CheckPage(iPage, pHints)) {

[Tom Sepez, 2015/09/22 00:05:38]

nit: just return m_pHintTabls->CheckPage(...);

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+        return FALSE;
+      }
+      return TRUE;
+    } else {

[Tom Sepez, 2015/09/22 00:05:39]

nit: else after return not needed.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+      if (m_bMainXRefLoadedOK) {
+        if (m_bTotalLoadPageTree) {
+          if (!LoadPages(pHints)) {
+            return FALSE;
+          }
+        } else {
+          if (!m_bCurPageDictLoadOK && !CheckPage(iPage, pHints)) {
+            return FALSE;
+          }
+        }
+      } else {
+        if (!LoadAllFile(pHints)) {
+          return FALSE;
+        }
+        ((CPDF_Parser*)m_pDocument->GetParser())->RebuildCrossRef();
+        ResetFirstCheck(iPage);
+        return TRUE;
+      }
+    }
+  } else {
+    if (!m_bTotalLoadPageTree) {
+      if (!m_bCurPageDictLoadOK && !CheckPage(iPage, pHints)) {
+        return FALSE;
+      }
+    }
+  }
+  if (m_bHaveAcroForm && !m_bAcroFormLoad) {
+    if (!CheckAcroFormSubObject(pHints)) {
+      return FALSE;
+    }
+    m_bAcroFormLoad = TRUE;
+  }
+  if (!m_bPageLoadedOK) {
+    if (!m_objs_array.GetSize()) {
+      m_objs_array.RemoveAll();
+      m_objnum_array.RemoveAll();
+      m_pPageDict = m_pDocument->GetPage(iPage);
+      if (!m_pPageDict) {
+        ResetFirstCheck(iPage);
+        return TRUE;
+      }
+      CFX_PtrArray obj_array;
+      obj_array.Add(m_pPageDict);
+      FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
+      if (bRet) {
+        m_objs_array.RemoveAll();
+        m_bPageLoadedOK = TRUE;
+      } else {
+        return bRet;
+      }
+    } else {
+      CFX_PtrArray new_objs_array;
+      FX_BOOL bRet =
+          IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+      m_objs_array.RemoveAll();
+      if (bRet) {
+        m_bPageLoadedOK = TRUE;
+      } else {
+        m_objs_array.Append(new_objs_array);
+        return bRet;
+      }
+    }
+  }
+  if (m_bPageLoadedOK) {
+    if (!m_bAnnotsLoad) {
+      if (!CheckPageAnnots(iPage, pHints)) {
+        return FALSE;
+      }
+      m_bAnnotsLoad = TRUE;
+    }
+  }
+  if (m_pPageDict && !m_bNeedDownLoadResource) {
+    m_pPageResource = m_pPageDict->GetElement("Resources");
+    if (!m_pPageResource) {
+      m_bNeedDownLoadResource = HaveResourceAncestor(m_pPageDict);
+    } else {
+      m_bNeedDownLoadResource = TRUE;
+    }
+  }
+  if (m_bNeedDownLoadResource) {
+    FX_BOOL bRet = CheckResources(pHints);
+    if (!bRet) {
+      return FALSE;
+    }
+    m_bNeedDownLoadResource = FALSE;
+  }
+  m_bPageLoadedOK = FALSE;
+  m_bAnnotsLoad = FALSE;
+  m_bCurPageDictLoadOK = FALSE;
+  ResetFirstCheck(iPage);
+  m_pagesLoadState.insert(iPage);
+  return TRUE;
+}
+FX_BOOL CPDF_DataAvail::CheckResources(IFX_DownloadHints* pHints) {
+  if (!m_objs_array.GetSize()) {
+    m_objs_array.RemoveAll();
+    CFX_PtrArray obj_array;
+    obj_array.Add(m_pPageResource);
+    FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
+    if (bRet) {
+      m_objs_array.RemoveAll();
+    }
+    return bRet;
+  }
+  CFX_PtrArray new_objs_array;
+  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+  m_objs_array.RemoveAll();
+  if (!bRet) {
+    m_objs_array.Append(new_objs_array);
+  }
+  return bRet;
+}
+void CPDF_DataAvail::GetLinearizedMainXRefInfo(FX_FILESIZE* pPos,
+                                               FX_DWORD* pSize) {
+  if (pPos) {
+    *pPos = m_dwLastXRefOffset;
+  }
+  if (pSize) {
+    *pSize = (FX_DWORD)(m_dwFileLen - m_dwLastXRefOffset);
+  }
+}
+int CPDF_DataAvail::GetPageCount() const {
+  if (!m_pDocument && !m_pLinearized) {
+    return 0;
+  }
+  if (m_pLinearized) {
+    CPDF_Dictionary* pDict = m_pLinearized->GetDict();
+    CPDF_Object* pObj = pDict ? pDict->GetElementValue(FX_BSTRC("N")) : nullptr;
+    return pObj ? pObj->GetInteger() : 0;
+  }
+  return m_pDocument->GetPageCount();
+}
+CPDF_Dictionary* CPDF_DataAvail::GetPage(int index) {
+  if (!m_pDocument || index < 0 || index >= this->GetPageCount()) {
+    return nullptr;
+  }
+  if (m_pLinearized) {
+    CPDF_Dictionary* pDict = m_pLinearized->GetDict();
+    CPDF_Object* pObj = pDict ? pDict->GetElementValue(FX_BSTRC("P")) : nullptr;
+    int pageNum = pObj ? pObj->GetInteger() : 0;
+    if (m_pHintTables && index != pageNum) {
+      FX_FILESIZE szPageStartPos = 0;
+      FX_FILESIZE szPageLength = 0;
+      FX_DWORD dwObjNum = 0;
+      FX_BOOL bPagePosGot = m_pHintTables->GetPagePos(index, szPageStartPos,
+                                                      szPageLength, dwObjNum);
+      if (!bPagePosGot) {
+        return nullptr;
+      }
+      m_syntaxParser.InitParser(m_pFileRead, (FX_DWORD)szPageStartPos);
+      CPDF_Object* pPageDict = ParseIndirectObjectAt(0, dwObjNum, m_pDocument);
+      if (!pPageDict) {
+        return nullptr;
+      }
+      m_pDocument->InsertIndirectObject(dwObjNum, pPageDict);
+      return pPageDict->GetDict();
+    }
+  }
+  return m_pDocument->GetPage(index);
+}
+int32_t CPDF_DataAvail::IsFormAvail(IFX_DownloadHints* pHints) {
+  if (!m_pDocument) {
+    return PDFFORM_AVAIL;
+  }
+  if (!m_bLinearizedFormParamLoad) {
+    CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
+    if (!pRoot) {
+      return PDFFORM_AVAIL;
+    }
+    CPDF_Object* pAcroForm = pRoot->GetElement(FX_BSTRC("AcroForm"));
+    if (!pAcroForm) {
+      return PDFFORM_NOTEXIST;
+    }
+    if (!CheckLinearizedData(pHints)) {
+      return PDFFORM_NOTAVAIL;
+    }
+    if (!m_objs_array.GetSize()) {
+      m_objs_array.Add(pAcroForm->GetDict());
+    }
+    m_bLinearizedFormParamLoad = TRUE;
+  }
+  CFX_PtrArray new_objs_array;
+  FX_BOOL bRet = IsObjectsAvail(m_objs_array, FALSE, pHints, new_objs_array);
+  m_objs_array.RemoveAll();
+  if (!bRet) {
+    m_objs_array.Append(new_objs_array);
+    return PDFFORM_NOTAVAIL;
+  }
+  return PDFFORM_AVAIL;
+}
+void CPDF_SortObjNumArray::AddObjNum(FX_DWORD dwObjNum) {
+  int32_t iNext = 0;
+  if (BinarySearch(dwObjNum, iNext)) {
+    return;
+  }
+  m_number_array.InsertAt(iNext, dwObjNum);
+}
+FX_BOOL CPDF_SortObjNumArray::Find(FX_DWORD dwObjNum) {
+  int32_t iNext = 0;
+  return BinarySearch(dwObjNum, iNext);
+}
+FX_BOOL CPDF_SortObjNumArray::BinarySearch(FX_DWORD value, int32_t& iNext) {
+  int32_t iLow = 0;
+  int32_t iHigh = m_number_array.GetSize() - 1;
+  while (iLow <= iHigh) {
+    int32_t iMid = (iLow + iHigh) / 2;
+    if (m_number_array.GetAt(iMid) == value) {
+      iNext = iMid;
+      return TRUE;
+    }
+    if (m_number_array.GetAt(iMid) > value) {
+      iHigh = iMid - 1;
+    } else if (m_number_array.GetAt(iMid) < value) {
+      iLow = iMid + 1;
+    }
+  }
+  iNext = iLow;
+  return FALSE;
+}
+CPDF_PageNode::~CPDF_PageNode() {
+  int32_t iSize = m_childNode.GetSize();
+  for (int32_t i = 0; i < iSize; ++i) {
+    CPDF_PageNode* pNode = (CPDF_PageNode*)m_childNode[i];
+    delete pNode;
+  }
+  m_childNode.RemoveAll();
+}
+CPDF_HintTables::~CPDF_HintTables() {
+  m_nFirstPageSharedObjs = 0;
+  m_szFirstPageObjOffset = 0;
+  m_dwDeltaNObjsArray.RemoveAll();
+  m_dwNSharedObjsArray.RemoveAll();
+  m_dwSharedObjNumArray.RemoveAll();
+  m_dwIdentifierArray.RemoveAll();
+  m_szPageOffsetArray.RemoveAll();
+  m_szSharedObjOffsetArray.RemoveAll();
+}
+FX_DWORD CPDF_HintTables::GetItemLength(int index, CFX_FileSizeArray& szArray) {

[Tom Sepez, 2015/09/22 00:05:38]

nit: const CFX_FileSizeArray&

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  if (index < 0 || index > szArray.GetSize() - 2) {
+    return 0;
+  }
+  return (szArray[index + 1] - szArray[index]);

[Tom Sepez, 2015/09/22 00:05:39]

nit: unnecessary ()

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+}
+FX_BOOL CPDF_HintTables::ReadPageHintTable(CFX_BitStream& h) {
+  if (!m_pLinearizedDict) {
+    return FALSE;
+  }
+  CPDF_Array* pRange = m_pLinearizedDict->GetArray(FX_BSTRC("H"));
+  CPDF_Object* pStreamOffset = pRange ? pRange->GetElementValue(0) : nullptr;
+  CPDF_Object* pStreamLen = pRange ? pRange->GetElementValue(1) : nullptr;

[Tom Sepez, 2015/09/22 00:05:39]

nit: prefer early return here rather than duplicating the same test in several ?
operators.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  int nStreamOffset = pStreamOffset ? pStreamOffset->GetInteger() : -1;
+  int nStreanLen = pStreamLen ? pStreamLen->GetInteger() : 0;

[Tom Sepez, 2015/09/22 00:05:39]

nit: typo: stream vs. strean

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  if (nStreamOffset < 0 || nStreanLen < 1) {
+    return FALSE;
+  }
+  // Item 1: The least number of objects in a page.
+  FX_DWORD dwObjLeastNum = h.GetBits(32);
+  // Item 2: The location of the first page¡¯s page object.

[Tom Sepez, 2015/09/22 00:05:38]

nit: typo.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  FX_DWORD dwFirstObjLoc = h.GetBits(32);
+  if (dwFirstObjLoc > nStreamOffset) {
+    m_szFirstPageObjOffset = dwFirstObjLoc + nStreanLen;

[Tom Sepez, 2015/09/22 00:05:38]

how do we know this doesn't overflow?

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  } else {
+    m_szFirstPageObjOffset = dwFirstObjLoc;
+  }
+  // Item 3: The number of bits needed to represent the difference
+  // between the greatest and least number of objects in a page.
+  FX_DWORD dwDeltaObjectsBits = h.GetBits(16);
+  // Item 4: The least length of a page in bytes.
+  FX_DWORD dwPageLeastLen = h.GetBits(32);
+  // Item 5: The number of bits needed to represent the difference
+  // between the greatest and least length of a page, in bytes.
+  FX_DWORD dwDeltaPageLenBits = h.GetBits(16);
+  // Skip Item 6, 7, 8, 9 total 96 bits.
+  h.SkipBits(96);
+  // Item 10: The number of bits needed to represent the greatest
+  // number of shared object references.
+  FX_DWORD dwSharedObjBits = h.GetBits(16);
+  // Item 11: The number of bits needed to represent the numerically
+  // greatest shared object identifier used by the pages.
+  FX_DWORD dwSharedIdBits = h.GetBits(16);
+  // Item 12: The number of bits needed to represent the numerator of
+  // the fractional position for each shared object reference. For each
+  // shared object referenced from a page, there is an indication of
+  // where in the page¡¯s content stream the object is first referenced.

[Tom Sepez, 2015/09/22 00:05:39]

nit: typo

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  FX_DWORD dwSharedNumeratorBits = h.GetBits(16);
+  // Item 13: The denominator of the fractional position for each shared
+  // object reference. It's useless.
+  FX_DWORD dwSharedDenominator = h.GetBits(16);

[Tom Sepez, 2015/09/22 00:05:39]

nit: just skipbits for item 13 like above.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  CPDF_Object* pPageNum = m_pLinearizedDict->GetElementValue(FX_BSTRC("N"));
+  int nPages = pPageNum ? pPageNum->GetInteger() : 0;
+  if (nPages < 1) {
+    return FALSE;
+  }
+  for (int i = 0; i < nPages; ++i) {
+    m_dwDeltaNObjsArray.Add(h.GetBits(dwDeltaObjectsBits) + dwObjLeastNum);

[Tom Sepez, 2015/09/22 00:05:38]

overflow on addition?

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  }
+  h.ByteAlign();
+  CFX_DWordArray dwPageLenArray;
+  for (int i = 0; i < nPages; ++i) {
+    dwPageLenArray.Add(h.GetBits(dwDeltaPageLenBits) + dwPageLeastLen);
+  }
+  CPDF_Object* pOffsetE = m_pLinearizedDict->GetElementValue(FX_BSTRC("E"));
+  int nOffsetE = pOffsetE ? pOffsetE->GetInteger() : -1;
+  if (nOffsetE < 0) {
+    return FALSE;
+  }
+  CPDF_Object* pFirstPageNum =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("P"));
+  int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
+  for (int i = 0; i < nPages; ++i) {
+    if (i == nFirstPageNum) {
+      m_szPageOffsetArray.Add(m_szFirstPageObjOffset);
+    } else if (i == nFirstPageNum + 1) {
+      if (i == 1) {
+        m_szPageOffsetArray.Add(nOffsetE);
+      } else {
+        m_szPageOffsetArray.Add(m_szPageOffsetArray[i - 2] +
+                                dwPageLenArray[i - 2]);
+      }
+    } else {
+      if (i == 0) {
+        m_szPageOffsetArray.Add(nOffsetE);
+      } else {
+        m_szPageOffsetArray.Add(m_szPageOffsetArray[i - 1] +
+                                dwPageLenArray[i - 1]);
+      }
+    }
+  }
+  if (nPages > 0) {
+    m_szPageOffsetArray.Add(m_szPageOffsetArray[nPages - 1] +
+                            dwPageLenArray[nPages - 1]);
+  } else {
+    m_szPageOffsetArray.Add(m_szFirstPageObjOffset);

[Tom Sepez, 2015/09/22 00:05:38]

I don't think this can be reached since we returned at 4850 otherwise?

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+    m_szPageOffsetArray.Add(nOffsetE);
+  }
+  h.ByteAlign();
+  /** The number of shared objects. */

[Tom Sepez, 2015/09/22 00:05:39]

nit: prefer c++ // style.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  for (int i = 0; i < nPages; i++) {
+    m_dwNSharedObjsArray.Add(h.GetBits(dwSharedObjBits));
+  }
+  h.ByteAlign();
+  // array of identifier, sizes = nshared_objects
+  for (int i = 0; i < nPages; i++) {
+    for (int j = 0; j < m_dwNSharedObjsArray[i]; j++) {
+      m_dwIdentifierArray.Add(h.GetBits(dwSharedIdBits));
+    }
+  }
+  h.ByteAlign();
+  for (int i = 0; i < nPages; i++) {
+    h.SkipBits(m_dwNSharedObjsArray[i] * dwSharedNumeratorBits);

[Tom Sepez, 2015/09/22 00:05:38]

again, overflow? 

+  }
+  h.ByteAlign();
+  h.SkipBits(dwDeltaPageLenBits * nPages);

[Tom Sepez, 2015/09/22 00:05:39]

overflow?

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  h.ByteAlign();
+  return TRUE;
+}
+FX_BOOL CPDF_HintTables::ReadSharedObjHintTable(CFX_BitStream& h) {
+  if (!m_pLinearizedDict) {
+    return FALSE;
+  }
+  CPDF_Array* pRange = m_pLinearizedDict->GetArray(FX_BSTRC("H"));

[Tom Sepez, 2015/09/22 00:05:39]

nit: same as above. Let's make a helper function and consolidate.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  CPDF_Object* pStreamOffset = pRange ? pRange->GetElementValue(0) : nullptr;
+  CPDF_Object* pStreamLen = pRange ? pRange->GetElementValue(1) : nullptr;
+  int nStreamOffset = pStreamOffset ? pStreamOffset->GetInteger() : -1;
+  int nStreanLen = pStreamLen ? pStreamLen->GetInteger() : 0;

[Tom Sepez, 2015/09/22 00:05:39]

nit: typo: stream vs. strean

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  if (nStreamOffset < 0 || nStreanLen < 1) {
+    return FALSE;
+  }
+  // Item 1: The object number of the first object in the shared objects
+  // section.
+  FX_DWORD dwFirstSharedObjNum = h.GetBits(32);
+  // Item 2: The location of the first object in the shared objects section.
+  FX_DWORD dwFirstSharedObjLoc = h.GetBits(32);
+  if (dwFirstSharedObjLoc > nStreamOffset) {
+    dwFirstSharedObjLoc += nStreanLen;
+  }
+  // Item 3: The number of shared object entries for the first page.
+  m_nFirstPageSharedObjs = h.GetBits(32);
+  // Item 4: The number of shared object entries for the shared objects
+  // section, including the number of shared object entries for the first page.
+  FX_DWORD dwSharedObjTotal = h.GetBits(32);
+  // Item 5: The number of bits needed to represent the greatest number of
+  // objects in a shared object group. Skipped.
+  h.SkipBits(16);
+  // Item 6: The least length of a shared object group in bytes.
+  FX_DWORD dwGroupLeastLen = h.GetBits(32);
+  // Item 7: The number of bits needed to represent the difference between the
+  // greatest and least length of a shared object group, in bytes.
+  FX_DWORD dwDeltaGroupLen = h.GetBits(16);
+  CPDF_Object* pFirstPageObj =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("O"));
+  int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
+  if (nFirstPageObjNum < 0) {
+    return FALSE;
+  }
+  FX_DWORD dwSharedObjLen = 0;
+  FX_DWORD dwSharedObjsLen = 0;
+  for (int i = 0; i < dwSharedObjTotal; ++i) {
+    dwSharedObjLen = dwSharedObjsLen;
+    dwSharedObjsLen = h.GetBits(dwDeltaGroupLen) + dwGroupLeastLen;

[Tom Sepez, 2015/09/22 00:05:39]

nit: overflow.

+    if (i < m_nFirstPageSharedObjs) {
+      m_dwSharedObjNumArray.Add(nFirstPageObjNum + i);
+      if (i == 0) {
+        m_szSharedObjOffsetArray.Add(m_szFirstPageObjOffset);
+      } else {
+        m_szSharedObjOffsetArray.Add(m_szSharedObjOffsetArray[i - 1] +
+                                     dwSharedObjLen);
+      }
+    } else {
+      m_dwSharedObjNumArray.Add(dwSharedObjTotal + i - m_nFirstPageSharedObjs);
+      if (i == m_nFirstPageSharedObjs) {
+        m_szSharedObjOffsetArray.Add(dwSharedObjTotal);
+      } else {
+        m_szSharedObjOffsetArray.Add(m_szSharedObjOffsetArray[i - 1] +
+                                     dwSharedObjLen);
+      }
+    }
+  }
+  if (dwSharedObjTotal > 0) {
+    m_szSharedObjOffsetArray.Add(
+        m_szSharedObjOffsetArray[dwSharedObjTotal - 1] + dwSharedObjsLen);
+  }
+  h.ByteAlign();
+  h.SkipBits(dwSharedObjTotal);
+  h.ByteAlign();
+  return TRUE;
+}
+FX_BOOL CPDF_HintTables::GetPagePos(int index,
+                                    FX_FILESIZE& szPageStartPos,
+                                    FX_FILESIZE& szPageLength,
+                                    FX_DWORD& dwObjNum) {
+  if (!m_pLinearizedDict) {
+    return FALSE;
+  }
+  szPageStartPos = m_szPageOffsetArray[index];
+  szPageLength = GetItemLength(index, m_szPageOffsetArray);
+  CPDF_Object* pFirstPageNum =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("P"));
+  int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
+  CPDF_Object* pFirstPageObjNum =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("O"));
+  if (!pFirstPageObjNum) {
+    return FALSE;
+  }
+  int nFirstPageObjNum = pFirstPageObjNum->GetInteger();
+  if (index == nFirstPageNum) {
+    dwObjNum = nFirstPageObjNum;
+    return TRUE;
+  }
+  // The object number of remaining pages starts from 1.
+  dwObjNum = 1;
+  for (int i = 0; i < index; ++i) {
+    if (i == nFirstPageNum) {
+      continue;
+    }
+    dwObjNum += m_dwDeltaNObjsArray[i];
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_HintTables::CheckPage(int index, IFX_DownloadHints* pHints) {
+  if (!m_pLinearizedDict) {
+    return FALSE;
+  }
+  CPDF_Object* pFirstAvailPage =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("P"));
+  int nFirstAvailPage = pFirstAvailPage ? pFirstAvailPage->GetInteger() : 0;
+  if (index == nFirstAvailPage) {
+    return TRUE;
+  }
+  FX_DWORD dwLength = GetItemLength(index, m_szPageOffsetArray);
+  if (!dwLength ||
+      !m_pDataAvail->IsDataAvail(m_szPageOffsetArray[index], dwLength,
+                                 pHints)) {
+    return FALSE;
+  }
+  // Download data of shared objects in the page.
+  FX_DWORD offset = 0;
+  for (int i = 0; i < index; ++i) {
+    offset += m_dwNSharedObjsArray[i];
+  }
+  CPDF_Object* pFirstPageObj =
+      m_pLinearizedDict->GetElementValue(FX_BSTRC("O"));
+  int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
+  if (nFirstPageObjNum < 0) {
+    return FALSE;
+  }
+  FX_DWORD dwIndex = 0;
+  FX_DWORD dwObjNum = 0;
+  for (int j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
+    dwIndex = m_dwIdentifierArray[offset + j];

[Tom Sepez, 2015/09/22 00:05:38]

how do we know that the bounds are trustworthy here?

+    dwObjNum = m_dwSharedObjNumArray[dwIndex];
+    if (dwObjNum >= nFirstPageObjNum &&
+        dwObjNum < nFirstPageObjNum + m_nFirstPageSharedObjs) {
+      continue;
+    }
+    dwLength = GetItemLength(dwIndex, m_szSharedObjOffsetArray);
+    if (!dwLength ||
+        !m_pDataAvail->IsDataAvail(m_szSharedObjOffsetArray[dwIndex], dwLength,
+                                   pHints)) {
+      return FALSE;
+    }
+  }
+  return TRUE;
+}
+FX_BOOL CPDF_HintTables::LoadHintStream(CPDF_Stream* pHintStream) {
+  if (!pHintStream || !m_pLinearizedDict) {
+    return FALSE;
+  }
+  CPDF_Dictionary* pDict = pHintStream->GetDict();
+  CPDF_Object* pOffset = pDict ? pDict->GetElement(FX_BSTRC("S")) : nullptr;
+  if (!pOffset || pOffset->GetType() != PDFOBJ_NUMBER) {
+    return FALSE;
+  }
+  CPDF_StreamAcc acc;
+  acc.LoadAllData(pHintStream);
+  FX_DWORD size = acc.GetSize();
+  // The header section of page offset hint table is 36 bytes.
+  // The header section of shared object hint table is 24 bytes.
+  // Hint table has at least 60 bytes.
+  const FX_DWORD MIN_STREAM_LEN = 60;
+  if (size < MIN_STREAM_LEN || size < pOffset->GetInteger() ||
+      !pOffset->GetInteger()) {
+    return FALSE;
+  }
+  const uint8_t* pData = acc.GetData();

[Tom Sepez, 2015/09/22 00:05:39]

nit: don't ned a local here, just bs.Init(acc.GetData()...) below.

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+  CFX_BitStream bs;
+  bs.Init(pData, size);
+  if (!ReadPageHintTable(bs) || !ReadSharedObjHintTable(bs)) {

[Tom Sepez, 2015/09/22 00:05:39]

nit: or just 

  return ReadPageHintTable(bs) && readSharedObjHintTable(bs);

[jun_fang, 2015/09/22 12:42:32]

Acknowledged.

+    return FALSE;
+  }
+  return TRUE;
+}