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Unified Diff: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp

Issue 1778173002: Split apart the remainder of fpdf_render_render.cpp into per-class files. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master
Patch Set: Nits Created 4 years, 9 months ago
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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
deleted file mode 100644
index 0d62e4d3ed52580e536da8e5f933018272483b9a..0000000000000000000000000000000000000000
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ /dev/null
@@ -1,2450 +0,0 @@
-// 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 "core/include/fpdfapi/fpdf_parser.h"
-
-#include <algorithm>
-#include <memory>
-#include <set>
-#include <utility>
-#include <vector>
-
-#include "core/include/fpdfapi/cpdf_document.h"
-#include "core/include/fpdfapi/cpdf_parser.h"
-#include "core/include/fpdfapi/fpdf_module.h"
-#include "core/include/fpdfapi/fpdf_page.h"
-#include "core/include/fxcrt/fx_ext.h"
-#include "core/include/fxcrt/fx_safe_types.h"
-#include "core/src/fpdfapi/fpdf_page/pageint.h"
-#include "core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
-#include "core/src/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
-#include "core/src/fpdfapi/fpdf_parser/parser_int.h"
-#include "third_party/base/stl_util.h"
-
-namespace {
-
-bool CanReadFromBitStream(const CFX_BitStream* hStream,
- const FX_SAFE_DWORD& num_bits) {
- return num_bits.IsValid() &&
- hStream->BitsRemaining() >= num_bits.ValueOrDie();
-}
-
-} // namespace
-
-bool IsSignatureDict(const CPDF_Dictionary* pDict) {
- CPDF_Object* pType = pDict->GetElementValue("Type");
- if (!pType)
- pType = pDict->GetElementValue("FT");
- return pType && pType->GetString() == "Sig";
-}
-
-
-class CPDF_DataAvail final : public IPDF_DataAvail {
- public:
- CPDF_DataAvail(IFX_FileAvail* pFileAvail,
- IFX_FileRead* pFileRead,
- FX_BOOL bSupportHintTable);
- ~CPDF_DataAvail() override;
-
- // IPDF_DataAvail:
- DocAvailStatus IsDocAvail(IFX_DownloadHints* pHints) override;
- void SetDocument(CPDF_Document* pDoc) override;
- DocAvailStatus IsPageAvail(int iPage, IFX_DownloadHints* pHints) override;
- DocFormStatus IsFormAvail(IFX_DownloadHints* pHints) override;
- DocLinearizationStatus IsLinearizedPDF() override;
- FX_BOOL IsLinearized() override { return m_bLinearized; }
- void GetLinearizedMainXRefInfo(FX_FILESIZE* pPos, FX_DWORD* pSize) override;
-
- int GetPageCount() const;
- CPDF_Dictionary* GetPage(int index);
-
- friend class CPDF_HintTables;
-
- protected:
- static const int kMaxDataAvailRecursionDepth = 64;
- static int s_CurrentDataAvailRecursionDepth;
- static const int kMaxPageRecursionDepth = 1024;
-
- FX_DWORD GetObjectSize(FX_DWORD objnum, FX_FILESIZE& offset);
- FX_BOOL IsObjectsAvail(CFX_ArrayTemplate<CPDF_Object*>& obj_array,
- FX_BOOL bParsePage,
- IFX_DownloadHints* pHints,
- CFX_ArrayTemplate<CPDF_Object*>& 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_IndirectObjectHolder* pObjList = nullptr);
- 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);
- DocAvailStatus CheckLinearizedData(IFX_DownloadHints* pHints);
- FX_BOOL CheckPageAnnots(int iPage, IFX_DownloadHints* pHints);
-
- DocAvailStatus 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,
- int level);
- 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);
- 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;
- std::set<FX_DWORD> m_ObjectSet;
- CFX_ArrayTemplate<CPDF_Object*> m_objs_array;
- FX_FILESIZE m_Pos;
- FX_FILESIZE m_bufferOffset;
- FX_DWORD m_bufferSize;
- CFX_ByteString m_WordBuf;
- uint8_t m_bufferData[512];
- 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_ArrayTemplate<CPDF_Object*> m_arrayAcroforms;
- CPDF_Dictionary* m_pPageDict;
- CPDF_Object* m_pPageResource;
- FX_BOOL m_bNeedDownLoadResource;
- FX_BOOL m_bPageLoadedOK;
- FX_BOOL m_bLinearizedFormParamLoad;
- CFX_ArrayTemplate<CPDF_Object*> 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;
- std::unique_ptr<CPDF_HintTables> m_pHintTables;
- FX_BOOL m_bSupportHintTable;
-};
-
-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, TRUE);
-}
-
-// 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_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_bSupportHintTable = bSupportHintTable;
-}
-CPDF_DataAvail::~CPDF_DataAvail() {
- if (m_pLinearized)
- m_pLinearized->Release();
-
- if (m_pRoot)
- m_pRoot->Release();
-
- if (m_pTrailer)
- m_pTrailer->Release();
-
- int iSize = m_arrayAcroforms.GetSize();
- for (int i = 0; i < iSize; ++i)
- 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 = m_pDocument->GetParser();
- if (!pParser || !pParser->IsValidObjectNumber(objnum))
- return 0;
-
- if (pParser->GetObjectType(objnum) == 2)
- objnum = pParser->GetObjectPositionOrZero(objnum);
-
- if (pParser->GetObjectType(objnum) != 1 &&
- pParser->GetObjectType(objnum) != 255) {
- return 0;
- }
-
- offset = pParser->GetObjectPositionOrZero(objnum);
- if (offset == 0)
- return 0;
-
- auto it = pParser->m_SortedOffset.find(offset);
- if (it == pParser->m_SortedOffset.end() ||
- ++it == pParser->m_SortedOffset.end()) {
- return 0;
- }
- return *it - offset;
-}
-
-FX_BOOL CPDF_DataAvail::IsObjectsAvail(
- CFX_ArrayTemplate<CPDF_Object*>& obj_array,
- FX_BOOL bParsePage,
- IFX_DownloadHints* pHints,
- CFX_ArrayTemplate<CPDF_Object*>& ret_array) {
- if (!obj_array.GetSize())
- return TRUE;
-
- FX_DWORD count = 0;
- CFX_ArrayTemplate<CPDF_Object*> new_obj_array;
- int32_t i = 0;
- for (i = 0; i < obj_array.GetSize(); i++) {
- CPDF_Object* pObj = obj_array[i];
- if (!pObj)
- continue;
-
- int32_t type = pObj->GetType();
- switch (type) {
- case CPDF_Object::ARRAY: {
- CPDF_Array* pArray = pObj->GetArray();
- for (FX_DWORD k = 0; k < pArray->GetCount(); ++k)
- new_obj_array.Add(pArray->GetElement(k));
- } break;
- case CPDF_Object::STREAM:
- pObj = pObj->GetDict();
- case CPDF_Object::DICTIONARY: {
- CPDF_Dictionary* pDict = pObj->GetDict();
- if (pDict && pDict->GetStringBy("Type") == "Page" && !bParsePage)
- continue;
-
- for (const auto& it : *pDict) {
- const CFX_ByteString& key = it.first;
- CPDF_Object* value = it.second;
- if (key != "Parent")
- new_obj_array.Add(value);
- }
- } break;
- case CPDF_Object::REFERENCE: {
- CPDF_Reference* pRef = pObj->AsReference();
- 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 (!pdfium::ContainsKey(m_ObjectSet, dwNum)) {
- m_ObjectSet.insert(dwNum);
- CPDF_Object* pReferred =
- m_pDocument->GetIndirectObject(pRef->GetRefObjNum());
- 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 = new_obj_array[i];
- if (CPDF_Reference* pRef = pObj->AsReference()) {
- FX_DWORD dwNum = pRef->GetRefObjNum();
- if (!pdfium::ContainsKey(m_ObjectSet, 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);
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_DataAvail::IsDocAvail(
- IFX_DownloadHints* pHints) {
- if (!m_dwFileLen && m_pFileRead) {
- m_dwFileLen = (FX_DWORD)m_pFileRead->GetSize();
- if (!m_dwFileLen)
- return DataError;
- }
-
- while (!m_bDocAvail) {
- if (!CheckDocStatus(pHints))
- return DataNotAvailable;
- }
-
- return DataAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckAcroFormSubObject(IFX_DownloadHints* pHints) {
- if (!m_objs_array.GetSize()) {
- m_objs_array.RemoveAll();
- m_ObjectSet.clear();
- CFX_ArrayTemplate<CPDF_Object*> 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_ArrayTemplate<CPDF_Object*> 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) {
- 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_LOADALLCROSSREF:
- 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_pSyntax->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;
- }
-
- 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) {
- size = GetObjectSize(objnum, offset);
- pParser = m_pDocument->GetParser();
- } else {
- size = (FX_DWORD)m_parser.GetObjectSize(objnum);
- offset = m_parser.GetObjectOffset(objnum);
- pParser = &m_parser;
- }
-
- if (!IsDataAvail(offset, size, pHints))
- return nullptr;
-
- if (pParser)
- pRet = pParser->ParseIndirectObject(nullptr, objnum);
-
- 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) {
- m_docStatus =
- (m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : 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();
-
- m_docStatus =
- (m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : 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 = ToReference(pDict->GetElement("Pages"));
- if (!pRef) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- m_PagesObjNum = pRef->GetRefObjNum();
- CPDF_Reference* pAcroFormRef =
- ToReference(m_pRoot->GetDict()->GetElement("AcroForm"));
- if (pAcroFormRef) {
- m_bHaveAcroForm = TRUE;
- m_dwAcroFormObjNum = pAcroFormRef->GetRefObjNum();
- }
-
- if (m_dwInfoObjNum) {
- m_docStatus = PDF_DATAAVAIL_INFO;
- } else {
- m_docStatus =
- m_bHaveAcroForm ? PDF_DATAAVAIL_ACROFORM : PDF_DATAAVAIL_PAGETREE;
- }
- return TRUE;
-}
-
-FX_BOOL CPDF_DataAvail::PreparePageItem() {
- CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
- CPDF_Reference* pRef =
- ToReference(pRoot ? pRoot->GetElement("Pages") : nullptr);
- if (!pRef) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- m_PagesObjNum = pRef->GetRefObjNum();
- m_pCurrentParser = m_pDocument->GetParser();
- m_docStatus = PDF_DATAAVAIL_PAGETREE;
- return TRUE;
-}
-
-bool CPDF_DataAvail::IsFirstCheck(int iPage) {
- return m_pageMapCheckState.insert(iPage).second;
-}
-
-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->IsArray()) {
- CPDF_Array* pArray = pObj->GetArray();
- if (pArray) {
- int32_t iSize = pArray->GetCount();
- for (int32_t j = 0; j < iSize; ++j) {
- if (CPDF_Reference* pRef = ToReference(pArray->GetElement(j)))
- UnavailObjList.Add(pRef->GetRefObjNum());
- }
- }
- }
-
- if (!pObj->IsDictionary()) {
- pObj->Release();
- continue;
- }
-
- CFX_ByteString type = pObj->GetDict()->GetStringBy("Type");
- if (type == "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 = m_PagesArray.GetAt(i);
- if (!pPages)
- continue;
-
- if (!GetPageKids(m_pCurrentParser, pPages)) {
- pPages->Release();
- while (++i < iPages) {
- pPages = 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("Kids") : NULL;
- if (!pKids)
- return TRUE;
-
- switch (pKids->GetType()) {
- case CPDF_Object::REFERENCE:
- m_PageObjList.Add(pKids->AsReference()->GetRefObjNum());
- break;
- case CPDF_Object::ARRAY: {
- CPDF_Array* pKidsArray = pKids->AsArray();
- for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
- if (CPDF_Reference* pRef = ToReference(pKidsArray->GetElement(i)))
- m_PageObjList.Add(pRef->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("E") : NULL;
- if (!pEndOffSet) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- CPDF_Object* pXRefOffset = pDict ? pDict->GetElement("T") : NULL;
- if (!pXRefOffset) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- CPDF_Object* pFileLen = pDict ? pDict->GetElement("L") : NULL;
- if (!pFileLen) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- FX_BOOL bNeedDownLoad = FALSE;
- if (pEndOffSet->IsNumber()) {
- 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->IsNumber())
- m_dwLastXRefOffset = pXRefOffset->GetInteger();
-
- if (pFileLen->IsNumber())
- 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 (offset > m_dwFileLen)
- return TRUE;
-
- FX_SAFE_DWORD safeSize = pdfium::base::checked_cast<FX_DWORD>(offset);
- safeSize += size;
- safeSize += 512;
- if (!safeSize.IsValid() || 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) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- if (!pDict->KeyExist("H") || !pDict->KeyExist("O") || !pDict->KeyExist("N")) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- int nPageCount = pDict->GetElementValue("N")->GetInteger();
- if (nPageCount <= 1) {
- m_docStatus = PDF_DATAAVAIL_DONE;
- return TRUE;
- }
-
- CPDF_Array* pHintStreamRange = pDict->GetArrayBy("H");
- FX_FILESIZE szHSStart =
- pHintStreamRange->GetElementValue(0)
- ? pHintStreamRange->GetElementValue(0)->GetInteger()
- : 0;
- FX_FILESIZE szHSLength =
- pHintStreamRange->GetElementValue(1)
- ? pHintStreamRange->GetElementValue(1)->GetInteger()
- : 0;
- if (szHSStart < 0 || szHSLength <= 0) {
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- if (!IsDataAvail(szHSStart, szHSLength, pHints))
- return FALSE;
-
- m_syntaxParser.InitParser(m_pFileRead, m_dwHeaderOffset);
-
- std::unique_ptr<CPDF_HintTables> pHintTables(
- new CPDF_HintTables(this, pDict));
- std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pHintStream(
- ParseIndirectObjectAt(szHSStart, 0));
- CPDF_Stream* pStream = ToStream(pHintStream.get());
- if (pStream && pHintTables->LoadHintStream(pStream))
- m_pHintTables = std::move(pHintTables);
-
- m_docStatus = PDF_DATAAVAIL_DONE;
- return TRUE;
-}
-
-CPDF_Object* CPDF_DataAvail::ParseIndirectObjectAt(
- FX_FILESIZE pos,
- FX_DWORD objnum,
- CPDF_IndirectObjectHolder* pObjList) {
- FX_FILESIZE SavedPos = m_syntaxParser.SavePos();
- m_syntaxParser.RestorePos(pos);
-
- bool bIsNumber;
- CFX_ByteString word = m_syntaxParser.GetNextWord(&bIsNumber);
- if (!bIsNumber)
- return nullptr;
-
- FX_DWORD parser_objnum = FXSYS_atoui(word);
- if (objnum && parser_objnum != objnum)
- return nullptr;
-
- word = m_syntaxParser.GetNextWord(&bIsNumber);
- if (!bIsNumber)
- return nullptr;
-
- FX_DWORD gennum = FXSYS_atoui(word);
- if (m_syntaxParser.GetKeyword() != "obj") {
- m_syntaxParser.RestorePos(SavedPos);
- return nullptr;
- }
-
- CPDF_Object* pObj =
- m_syntaxParser.GetObject(pObjList, parser_objnum, gennum, true);
- m_syntaxParser.RestorePos(SavedPos);
- return pObj;
-}
-
-IPDF_DataAvail::DocLinearizationStatus CPDF_DataAvail::IsLinearizedPDF() {
- FX_DWORD req_size = 1024;
- if (!m_pFileAvail->IsDataAvail(0, req_size))
- return LinearizationUnknown;
-
- if (!m_pFileRead)
- return NotLinearized;
-
- FX_FILESIZE dwSize = m_pFileRead->GetSize();
- if (dwSize < (FX_FILESIZE)req_size)
- return LinearizationUnknown;
-
- uint8_t buffer[1024];
- m_pFileRead->ReadBlock(buffer, 0, req_size);
- if (IsLinearizedFile(buffer, req_size))
- return Linearized;
-
- return NotLinearized;
-}
-FX_BOOL CPDF_DataAvail::IsLinearizedFile(uint8_t* pData, FX_DWORD dwLen) {
- ScopedFileStream 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);
-
- bool bNumber;
- CFX_ByteString wordObjNum = m_syntaxParser.GetNextWord(&bNumber);
- if (!bNumber)
- return FALSE;
-
- FX_DWORD objnum = FXSYS_atoui(wordObjNum);
- if (m_pLinearized) {
- m_pLinearized->Release();
- m_pLinearized = nullptr;
- }
-
- m_pLinearized =
- ParseIndirectObjectAt(m_syntaxParser.m_HeaderOffset + 9, objnum);
- if (!m_pLinearized)
- return FALSE;
-
- CPDF_Dictionary* pDict = m_pLinearized->GetDict();
- if (pDict && pDict->GetElement("Linearized")) {
- CPDF_Object* pLen = pDict->GetElement("L");
- if (!pLen)
- return FALSE;
-
- if ((FX_FILESIZE)pLen->GetInteger() != m_pFileRead->GetSize())
- return FALSE;
-
- m_bLinearized = TRUE;
-
- if (CPDF_Number* pNo = ToNumber(pDict->GetElement("P")))
- 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);
-
- ScopedFileStream file(FX_CreateMemoryStream(buffer, (size_t)dwSize, FALSE));
- m_syntaxParser.InitParser(file.get(), 0);
- m_syntaxParser.RestorePos(dwSize - 1);
-
- if (m_syntaxParser.SearchWord("startxref", TRUE, FALSE, dwSize)) {
- m_syntaxParser.GetNextWord(nullptr);
-
- bool 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);
-
- ScopedFileStream file(FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
- m_parser.m_pSyntax->InitParser(file.get(), 0);
-
- bool bNumber;
- CFX_ByteString objnum = m_parser.m_pSyntax->GetNextWord(&bNumber);
- if (!bNumber)
- return -1;
-
- FX_DWORD objNum = FXSYS_atoui(objnum);
- CPDF_Object* pObj = m_parser.ParseIndirectObjectAt(nullptr, 0, objNum);
- if (!pObj) {
- m_Pos += m_parser.m_pSyntax->SavePos();
- return 0;
- }
-
- CPDF_Dictionary* pDict = pObj->GetDict();
- CPDF_Name* pName = ToName(pDict ? pDict->GetElement("Type") : nullptr);
- if (pName) {
- if (pName->GetString() == "XRef") {
- m_Pos += m_parser.m_pSyntax->SavePos();
- xref_offset = pObj->GetDict()->GetIntegerBy("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;
-}
-
-FX_BOOL CPDF_DataAvail::GetNextToken(CFX_ByteString& token) {
- uint8_t ch;
- if (!GetNextChar(ch))
- return FALSE;
-
- while (1) {
- while (PDFCharIsWhitespace(ch)) {
- if (!GetNextChar(ch))
- return FALSE;
- }
-
- if (ch != '%')
- break;
-
- while (1) {
- if (!GetNextChar(ch))
- return FALSE;
- if (PDFCharIsLineEnding(ch))
- break;
- }
- }
-
- uint8_t buffer[256];
- FX_DWORD index = 0;
- if (PDFCharIsDelimiter(ch)) {
- buffer[index++] = ch;
- if (ch == '/') {
- while (1) {
- if (!GetNextChar(ch))
- return FALSE;
-
- if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) {
- m_Pos--;
- CFX_ByteString ret(buffer, index);
- token = ret;
- return TRUE;
- }
-
- if (index < sizeof(buffer))
- buffer[index++] = ch;
- }
- } else if (ch == '<') {
- if (!GetNextChar(ch))
- return FALSE;
-
- if (ch == '<')
- buffer[index++] = ch;
- else
- m_Pos--;
- } else if (ch == '>') {
- if (!GetNextChar(ch))
- return FALSE;
-
- if (ch == '>')
- buffer[index++] = ch;
- else
- m_Pos--;
- }
-
- CFX_ByteString ret(buffer, index);
- token = ret;
- return TRUE;
- }
-
- while (1) {
- if (index < sizeof(buffer))
- buffer[index++] = ch;
-
- if (!GetNextChar(ch))
- return FALSE;
-
- if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) {
- m_Pos--;
- break;
- }
- }
-
- token = CFX_ByteString(buffer, index);
- 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_LOADALLCROSSREF;
- } 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") {
- 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_LOADALLCROSSREF;
- }
- 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;
-
- ScopedFileStream file(FX_CreateMemoryStream(pBuf, (size_t)iSize, FALSE));
- m_syntaxParser.InitParser(file.get(), 0);
-
- std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pTrailer(
- m_syntaxParser.GetObject(nullptr, 0, 0, true));
- if (!pTrailer) {
- m_Pos += m_syntaxParser.SavePos();
- pHints->AddSegment(m_Pos, iTrailerSize);
- return FALSE;
- }
-
- if (!pTrailer->IsDictionary())
- return FALSE;
-
- CPDF_Dictionary* pTrailerDict = pTrailer->GetDict();
- CPDF_Object* pEncrypt = pTrailerDict->GetElement("Encrypt");
- if (ToReference(pEncrypt)) {
- m_docStatus = PDF_DATAAVAIL_LOADALLFILE;
- return TRUE;
- }
-
- FX_DWORD xrefpos = GetDirectInteger(pTrailerDict, "Prev");
- if (xrefpos) {
- m_dwPrevXRefOffset = GetDirectInteger(pTrailerDict, "XRefStm");
- 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;
- 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;
- }
-
- CPDF_Array* pArray = pPages->AsArray();
- if (!pArray) {
- pPages->Release();
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- pPageNode->m_type = PDF_PAGENODE_PAGES;
- for (FX_DWORD i = 0; i < pArray->GetCount(); ++i) {
- CPDF_Reference* pKid = ToReference(pArray->GetElement(i));
- if (!pKid)
- continue;
-
- CPDF_PageNode* pNode = new CPDF_PageNode();
- pPageNode->m_childNode.Add(pNode);
- pNode->m_dwPageNo = 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;
- }
-
- if (pPage->IsArray()) {
- pPageNode->m_dwPageNo = dwPageNo;
- pPageNode->m_type = PDF_PAGENODE_ARRAY;
- pPage->Release();
- return TRUE;
- }
-
- if (!pPage->IsDictionary()) {
- pPage->Release();
- m_docStatus = PDF_DATAAVAIL_ERROR;
- return FALSE;
- }
-
- pPageNode->m_dwPageNo = dwPageNo;
- CPDF_Dictionary* pDict = pPage->GetDict();
- CFX_ByteString type = pDict->GetStringBy("Type");
- if (type == "Pages") {
- pPageNode->m_type = PDF_PAGENODE_PAGES;
- CPDF_Object* pKids = pDict->GetElement("Kids");
- if (!pKids) {
- m_docStatus = PDF_DATAAVAIL_PAGE;
- return TRUE;
- }
-
- switch (pKids->GetType()) {
- case CPDF_Object::REFERENCE: {
- CPDF_Reference* pKid = pKids->AsReference();
- CPDF_PageNode* pNode = new CPDF_PageNode();
- pPageNode->m_childNode.Add(pNode);
- pNode->m_dwPageNo = pKid->GetRefObjNum();
- } break;
- case CPDF_Object::ARRAY: {
- CPDF_Array* pKidsArray = pKids->AsArray();
- for (FX_DWORD i = 0; i < pKidsArray->GetCount(); ++i) {
- CPDF_Reference* pKid = ToReference(pKidsArray->GetElement(i));
- if (!pKid)
- continue;
-
- CPDF_PageNode* pNode = new CPDF_PageNode();
- pPageNode->m_childNode.Add(pNode);
- pNode->m_dwPageNo = pKid->GetRefObjNum();
- }
- } break;
- default:
- break;
- }
- } else if (type == "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,
- int level) {
- if (level >= kMaxPageRecursionDepth)
- return FALSE;
-
- 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 = pageNodes.m_childNode.GetAt(i);
- if (!pNode)
- continue;
-
- switch (pNode->m_type) {
- case PDF_PAGENODE_UNKNOWN:
- 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, level + 1))
- 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, 0);
-}
-
-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("Kids")) {
- pPages->Release();
- return TRUE;
- }
-
- int count = pPagesDict->GetIntegerBy("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;
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_DataAvail::CheckLinearizedData(
- IFX_DownloadHints* pHints) {
- if (m_bLinearedDataOK)
- return DataAvailable;
-
- if (!m_bMainXRefLoadTried) {
- FX_SAFE_DWORD data_size = m_dwFileLen;
- data_size -= m_dwLastXRefOffset;
- if (!data_size.IsValid())
- return DataError;
-
- if (!m_pFileAvail->IsDataAvail(m_dwLastXRefOffset,
- data_size.ValueOrDie())) {
- pHints->AddSegment(m_dwLastXRefOffset, data_size.ValueOrDie());
- return DataNotAvailable;
- }
-
- CPDF_Parser::Error eRet =
- m_pDocument->GetParser()->LoadLinearizedMainXRefTable();
- m_bMainXRefLoadTried = TRUE;
- if (eRet != CPDF_Parser::SUCCESS)
- return DataError;
-
- if (!PreparePageItem())
- return DataNotAvailable;
-
- m_bMainXRefLoadedOK = TRUE;
- m_bLinearedDataOK = TRUE;
- }
-
- return m_bLinearedDataOK ? DataAvailable : DataNotAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckPageAnnots(int32_t iPage,
- IFX_DownloadHints* pHints) {
- if (!m_objs_array.GetSize()) {
- m_objs_array.RemoveAll();
- m_ObjectSet.clear();
-
- CPDF_Dictionary* pPageDict = m_pDocument->GetPage(iPage);
- if (!pPageDict)
- return TRUE;
-
- CPDF_Object* pAnnots = pPageDict->GetElement("Annots");
- if (!pAnnots)
- return TRUE;
-
- CFX_ArrayTemplate<CPDF_Object*> 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_ArrayTemplate<CPDF_Object*> 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;
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_DataAvail::CheckLinearizedFirstPage(
- int32_t iPage,
- IFX_DownloadHints* pHints) {
- if (!m_bAnnotsLoad) {
- if (!CheckPageAnnots(iPage, pHints))
- return DataNotAvailable;
- m_bAnnotsLoad = TRUE;
- }
-
- DocAvailStatus nRet = CheckLinearizedData(pHints);
- if (nRet == DataAvailable)
- m_bPageLoadedOK = FALSE;
- return nRet;
-}
-
-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);
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_DataAvail::IsPageAvail(
- int32_t iPage,
- IFX_DownloadHints* pHints) {
- if (!m_pDocument)
- return DataError;
-
- if (IsFirstCheck(iPage)) {
- m_bCurPageDictLoadOK = FALSE;
- m_bPageLoadedOK = FALSE;
- m_bAnnotsLoad = FALSE;
- m_bNeedDownLoadResource = FALSE;
- m_objs_array.RemoveAll();
- m_ObjectSet.clear();
- }
-
- if (pdfium::ContainsKey(m_pagesLoadState, iPage))
- return DataAvailable;
-
- if (m_bLinearized) {
- if ((FX_DWORD)iPage == m_dwFirstPageNo) {
- DocAvailStatus nRet = CheckLinearizedFirstPage(iPage, pHints);
- if (nRet == DataAvailable)
- m_pagesLoadState.insert(iPage);
- return nRet;
- }
-
- DocAvailStatus nResult = CheckLinearizedData(pHints);
- if (nResult != DataAvailable)
- return nResult;
-
- if (m_pHintTables) {
- nResult = m_pHintTables->CheckPage(iPage, pHints);
- if (nResult != DataAvailable)
- return nResult;
- m_pagesLoadState.insert(iPage);
- return DataAvailable;
- }
-
- if (m_bMainXRefLoadedOK) {
- if (m_bTotalLoadPageTree) {
- if (!LoadPages(pHints))
- return DataNotAvailable;
- } else {
- if (!m_bCurPageDictLoadOK && !CheckPage(iPage, pHints))
- return DataNotAvailable;
- }
- } else {
- if (!LoadAllFile(pHints))
- return DataNotAvailable;
- m_pDocument->GetParser()->RebuildCrossRef();
- ResetFirstCheck(iPage);
- return DataAvailable;
- }
- } else {
- if (!m_bTotalLoadPageTree && !m_bCurPageDictLoadOK &&
- !CheckPage(iPage, pHints)) {
- return DataNotAvailable;
- }
- }
-
- if (m_bHaveAcroForm && !m_bAcroFormLoad) {
- if (!CheckAcroFormSubObject(pHints))
- return DataNotAvailable;
- m_bAcroFormLoad = TRUE;
- }
-
- if (!m_bPageLoadedOK) {
- if (!m_objs_array.GetSize()) {
- m_objs_array.RemoveAll();
- m_ObjectSet.clear();
-
- m_pPageDict = m_pDocument->GetPage(iPage);
- if (!m_pPageDict) {
- ResetFirstCheck(iPage);
- return DataAvailable;
- }
-
- CFX_ArrayTemplate<CPDF_Object*> obj_array;
- obj_array.Add(m_pPageDict);
- FX_BOOL bRet = IsObjectsAvail(obj_array, TRUE, pHints, m_objs_array);
- if (!bRet)
- return DataNotAvailable;
-
- m_objs_array.RemoveAll();
- } else {
- CFX_ArrayTemplate<CPDF_Object*> 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 DataNotAvailable;
- }
- }
- m_bPageLoadedOK = TRUE;
- }
-
- if (!m_bAnnotsLoad) {
- if (!CheckPageAnnots(iPage, pHints))
- return DataNotAvailable;
- 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 DataNotAvailable;
- m_bNeedDownLoadResource = FALSE;
- }
-
- m_bPageLoadedOK = FALSE;
- m_bAnnotsLoad = FALSE;
- m_bCurPageDictLoadOK = FALSE;
-
- ResetFirstCheck(iPage);
- m_pagesLoadState.insert(iPage);
- return DataAvailable;
-}
-
-FX_BOOL CPDF_DataAvail::CheckResources(IFX_DownloadHints* pHints) {
- if (!m_objs_array.GetSize()) {
- m_objs_array.RemoveAll();
- CFX_ArrayTemplate<CPDF_Object*> 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_ArrayTemplate<CPDF_Object*> 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_pLinearized) {
- CPDF_Dictionary* pDict = m_pLinearized->GetDict();
- CPDF_Object* pObj = pDict ? pDict->GetElementValue("N") : nullptr;
- return pObj ? pObj->GetInteger() : 0;
- }
- return m_pDocument ? m_pDocument->GetPageCount() : 0;
-}
-
-CPDF_Dictionary* CPDF_DataAvail::GetPage(int index) {
- if (!m_pDocument || index < 0 || index >= GetPageCount())
- return nullptr;
-
- if (m_pLinearized) {
- CPDF_Dictionary* pDict = m_pLinearized->GetDict();
- CPDF_Object* pObj = pDict ? pDict->GetElementValue("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;
-
- if (!m_pDocument->InsertIndirectObject(dwObjNum, pPageDict))
- return nullptr;
- return pPageDict->GetDict();
- }
- }
- return m_pDocument->GetPage(index);
-}
-
-IPDF_DataAvail::DocFormStatus CPDF_DataAvail::IsFormAvail(
- IFX_DownloadHints* pHints) {
- if (!m_pDocument)
- return FormAvailable;
-
- if (!m_bLinearizedFormParamLoad) {
- CPDF_Dictionary* pRoot = m_pDocument->GetRoot();
- if (!pRoot)
- return FormAvailable;
-
- CPDF_Object* pAcroForm = pRoot->GetElement("AcroForm");
- if (!pAcroForm)
- return FormNotExist;
-
- DocAvailStatus nDocStatus = CheckLinearizedData(pHints);
- if (nDocStatus == DataError)
- return FormError;
- if (nDocStatus == DataNotAvailable)
- return FormNotAvailable;
-
- if (!m_objs_array.GetSize())
- m_objs_array.Add(pAcroForm->GetDict());
- m_bLinearizedFormParamLoad = TRUE;
- }
-
- CFX_ArrayTemplate<CPDF_Object*> 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 FormNotAvailable;
- }
- return FormAvailable;
-}
-
-CPDF_PageNode::CPDF_PageNode() : m_type(PDF_PAGENODE_UNKNOWN) {}
-
-CPDF_PageNode::~CPDF_PageNode() {
- for (int32_t i = 0; i < m_childNode.GetSize(); ++i)
- delete m_childNode[i];
- m_childNode.RemoveAll();
-}
-
-CPDF_HintTables::~CPDF_HintTables() {
- m_dwDeltaNObjsArray.RemoveAll();
- m_dwNSharedObjsArray.RemoveAll();
- m_dwSharedObjNumArray.RemoveAll();
- m_dwIdentifierArray.RemoveAll();
-}
-
-FX_DWORD CPDF_HintTables::GetItemLength(
- int index,
- const std::vector<FX_FILESIZE>& szArray) {
- if (index < 0 || szArray.size() < 2 ||
- static_cast<size_t>(index) > szArray.size() - 2 ||
- szArray[index] > szArray[index + 1]) {
- return 0;
- }
- return szArray[index + 1] - szArray[index];
-}
-
-FX_BOOL CPDF_HintTables::ReadPageHintTable(CFX_BitStream* hStream) {
- if (!hStream || hStream->IsEOF())
- return FALSE;
-
- int nStreamOffset = ReadPrimaryHintStreamOffset();
- int nStreamLen = ReadPrimaryHintStreamLength();
- if (nStreamOffset < 0 || nStreamLen < 1)
- return FALSE;
-
- const FX_DWORD kHeaderSize = 288;
- if (hStream->BitsRemaining() < kHeaderSize)
- return FALSE;
-
- // Item 1: The least number of objects in a page.
- FX_DWORD dwObjLeastNum = hStream->GetBits(32);
-
- // Item 2: The location of the first page's page object.
- FX_DWORD dwFirstObjLoc = hStream->GetBits(32);
- if (dwFirstObjLoc > nStreamOffset) {
- FX_SAFE_DWORD safeLoc = pdfium::base::checked_cast<FX_DWORD>(nStreamLen);
- safeLoc += dwFirstObjLoc;
- if (!safeLoc.IsValid())
- return FALSE;
- m_szFirstPageObjOffset =
- pdfium::base::checked_cast<FX_FILESIZE>(safeLoc.ValueOrDie());
- } else {
- m_szFirstPageObjOffset =
- pdfium::base::checked_cast<FX_FILESIZE>(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 = hStream->GetBits(16);
-
- // Item 4: The least length of a page in bytes.
- FX_DWORD dwPageLeastLen = hStream->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 = hStream->GetBits(16);
-
- // Skip Item 6, 7, 8, 9 total 96 bits.
- hStream->SkipBits(96);
-
- // Item 10: The number of bits needed to represent the greatest
- // number of shared object references.
- FX_DWORD dwSharedObjBits = hStream->GetBits(16);
-
- // Item 11: The number of bits needed to represent the numerically
- // greatest shared object identifier used by the pages.
- FX_DWORD dwSharedIdBits = hStream->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.
- FX_DWORD dwSharedNumeratorBits = hStream->GetBits(16);
-
- // Item 13: Skip Item 13 which has 16 bits.
- hStream->SkipBits(16);
-
- CPDF_Object* pPageNum = m_pLinearizedDict->GetElementValue("N");
- int nPages = pPageNum ? pPageNum->GetInteger() : 0;
- if (nPages < 1)
- return FALSE;
-
- FX_SAFE_DWORD required_bits = dwDeltaObjectsBits;
- required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
- if (!CanReadFromBitStream(hStream, required_bits))
- return FALSE;
-
- for (int i = 0; i < nPages; ++i) {
- FX_SAFE_DWORD safeDeltaObj = hStream->GetBits(dwDeltaObjectsBits);
- safeDeltaObj += dwObjLeastNum;
- if (!safeDeltaObj.IsValid())
- return FALSE;
- m_dwDeltaNObjsArray.Add(safeDeltaObj.ValueOrDie());
- }
- hStream->ByteAlign();
-
- required_bits = dwDeltaPageLenBits;
- required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
- if (!CanReadFromBitStream(hStream, required_bits))
- return FALSE;
-
- CFX_DWordArray dwPageLenArray;
- for (int i = 0; i < nPages; ++i) {
- FX_SAFE_DWORD safePageLen = hStream->GetBits(dwDeltaPageLenBits);
- safePageLen += dwPageLeastLen;
- if (!safePageLen.IsValid())
- return FALSE;
- dwPageLenArray.Add(safePageLen.ValueOrDie());
- }
-
- CPDF_Object* pOffsetE = m_pLinearizedDict->GetElementValue("E");
- int nOffsetE = pOffsetE ? pOffsetE->GetInteger() : -1;
- if (nOffsetE < 0)
- return FALSE;
-
- CPDF_Object* pFirstPageNum = m_pLinearizedDict->GetElementValue("P");
- int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
- for (int i = 0; i < nPages; ++i) {
- if (i == nFirstPageNum) {
- m_szPageOffsetArray.push_back(m_szFirstPageObjOffset);
- } else if (i == nFirstPageNum + 1) {
- if (i == 1) {
- m_szPageOffsetArray.push_back(nOffsetE);
- } else {
- m_szPageOffsetArray.push_back(m_szPageOffsetArray[i - 2] +
- dwPageLenArray[i - 2]);
- }
- } else {
- if (i == 0) {
- m_szPageOffsetArray.push_back(nOffsetE);
- } else {
- m_szPageOffsetArray.push_back(m_szPageOffsetArray[i - 1] +
- dwPageLenArray[i - 1]);
- }
- }
- }
-
- if (nPages > 0) {
- m_szPageOffsetArray.push_back(m_szPageOffsetArray[nPages - 1] +
- dwPageLenArray[nPages - 1]);
- }
- hStream->ByteAlign();
-
- // Number of shared objects.
- required_bits = dwSharedObjBits;
- required_bits *= pdfium::base::checked_cast<FX_DWORD>(nPages);
- if (!CanReadFromBitStream(hStream, required_bits))
- return FALSE;
-
- for (int i = 0; i < nPages; i++)
- m_dwNSharedObjsArray.Add(hStream->GetBits(dwSharedObjBits));
- hStream->ByteAlign();
-
- // Array of identifiers, size = nshared_objects.
- for (int i = 0; i < nPages; i++) {
- required_bits = dwSharedIdBits;
- required_bits *= m_dwNSharedObjsArray[i];
- if (!CanReadFromBitStream(hStream, required_bits))
- return FALSE;
-
- for (int j = 0; j < m_dwNSharedObjsArray[i]; j++)
- m_dwIdentifierArray.Add(hStream->GetBits(dwSharedIdBits));
- }
- hStream->ByteAlign();
-
- for (int i = 0; i < nPages; i++) {
- FX_SAFE_DWORD safeSize = m_dwNSharedObjsArray[i];
- safeSize *= dwSharedNumeratorBits;
- if (!CanReadFromBitStream(hStream, safeSize))
- return FALSE;
-
- hStream->SkipBits(safeSize.ValueOrDie());
- }
- hStream->ByteAlign();
-
- FX_SAFE_DWORD safeTotalPageLen = pdfium::base::checked_cast<FX_DWORD>(nPages);
- safeTotalPageLen *= dwDeltaPageLenBits;
- if (!CanReadFromBitStream(hStream, safeTotalPageLen))
- return FALSE;
-
- hStream->SkipBits(safeTotalPageLen.ValueOrDie());
- hStream->ByteAlign();
- return TRUE;
-}
-
-FX_BOOL CPDF_HintTables::ReadSharedObjHintTable(CFX_BitStream* hStream,
- FX_DWORD offset) {
- if (!hStream || hStream->IsEOF())
- return FALSE;
-
- int nStreamOffset = ReadPrimaryHintStreamOffset();
- int nStreamLen = ReadPrimaryHintStreamLength();
- if (nStreamOffset < 0 || nStreamLen < 1)
- return FALSE;
-
- FX_SAFE_DWORD bit_offset = offset;
- bit_offset *= 8;
- if (!bit_offset.IsValid() || hStream->GetPos() > bit_offset.ValueOrDie())
- return FALSE;
- hStream->SkipBits(bit_offset.ValueOrDie() - hStream->GetPos());
-
- const FX_DWORD kHeaderSize = 192;
- if (hStream->BitsRemaining() < kHeaderSize)
- return FALSE;
-
- // Item 1: The object number of the first object in the shared objects
- // section.
- FX_DWORD dwFirstSharedObjNum = hStream->GetBits(32);
-
- // Item 2: The location of the first object in the shared objects section.
- FX_DWORD dwFirstSharedObjLoc = hStream->GetBits(32);
- if (dwFirstSharedObjLoc > nStreamOffset)
- dwFirstSharedObjLoc += nStreamLen;
-
- // Item 3: The number of shared object entries for the first page.
- m_nFirstPageSharedObjs = hStream->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 = hStream->GetBits(32);
-
- // Item 5: The number of bits needed to represent the greatest number of
- // objects in a shared object group. Skipped.
- hStream->SkipBits(16);
-
- // Item 6: The least length of a shared object group in bytes.
- FX_DWORD dwGroupLeastLen = hStream->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 = hStream->GetBits(16);
- CPDF_Object* pFirstPageObj = m_pLinearizedDict->GetElementValue("O");
- int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
- if (nFirstPageObjNum < 0)
- return FALSE;
-
- FX_DWORD dwPrevObjLen = 0;
- FX_DWORD dwCurObjLen = 0;
- FX_SAFE_DWORD required_bits = dwSharedObjTotal;
- required_bits *= dwDeltaGroupLen;
- if (!CanReadFromBitStream(hStream, required_bits))
- return FALSE;
-
- for (int i = 0; i < dwSharedObjTotal; ++i) {
- dwPrevObjLen = dwCurObjLen;
- FX_SAFE_DWORD safeObjLen = hStream->GetBits(dwDeltaGroupLen);
- safeObjLen += dwGroupLeastLen;
- if (!safeObjLen.IsValid())
- return FALSE;
-
- dwCurObjLen = safeObjLen.ValueOrDie();
- if (i < m_nFirstPageSharedObjs) {
- m_dwSharedObjNumArray.Add(nFirstPageObjNum + i);
- if (i == 0)
- m_szSharedObjOffsetArray.push_back(m_szFirstPageObjOffset);
- } else {
- FX_SAFE_DWORD safeObjNum = dwFirstSharedObjNum;
- safeObjNum += i - m_nFirstPageSharedObjs;
- if (!safeObjNum.IsValid())
- return FALSE;
-
- m_dwSharedObjNumArray.Add(safeObjNum.ValueOrDie());
- if (i == m_nFirstPageSharedObjs) {
- m_szSharedObjOffsetArray.push_back(
- pdfium::base::checked_cast<int32_t>(dwFirstSharedObjLoc));
- }
- }
-
- if (i != 0 && i != m_nFirstPageSharedObjs) {
- FX_SAFE_INT32 safeLoc = pdfium::base::checked_cast<int32_t>(dwPrevObjLen);
- safeLoc += m_szSharedObjOffsetArray[i - 1];
- if (!safeLoc.IsValid())
- return FALSE;
-
- m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
- }
- }
-
- if (dwSharedObjTotal > 0) {
- FX_SAFE_INT32 safeLoc = pdfium::base::checked_cast<int32_t>(dwCurObjLen);
- safeLoc += m_szSharedObjOffsetArray[dwSharedObjTotal - 1];
- if (!safeLoc.IsValid())
- return FALSE;
-
- m_szSharedObjOffsetArray.push_back(safeLoc.ValueOrDie());
- }
-
- hStream->ByteAlign();
- if (hStream->BitsRemaining() < dwSharedObjTotal)
- return FALSE;
-
- hStream->SkipBits(dwSharedObjTotal);
- hStream->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("P");
- int nFirstPageNum = pFirstPageNum ? pFirstPageNum->GetInteger() : 0;
-
- CPDF_Object* pFirstPageObjNum = m_pLinearizedDict->GetElementValue("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;
-}
-
-IPDF_DataAvail::DocAvailStatus CPDF_HintTables::CheckPage(
- int index,
- IFX_DownloadHints* pHints) {
- if (!m_pLinearizedDict || !pHints)
- return IPDF_DataAvail::DataError;
-
- CPDF_Object* pFirstAvailPage = m_pLinearizedDict->GetElementValue("P");
- int nFirstAvailPage = pFirstAvailPage ? pFirstAvailPage->GetInteger() : 0;
- if (index == nFirstAvailPage)
- return IPDF_DataAvail::DataAvailable;
-
- FX_DWORD dwLength = GetItemLength(index, m_szPageOffsetArray);
- // If two pages have the same offset, it should be treated as an error.
- if (!dwLength)
- return IPDF_DataAvail::DataError;
-
- if (!m_pDataAvail->IsDataAvail(m_szPageOffsetArray[index], dwLength, pHints))
- return IPDF_DataAvail::DataNotAvailable;
-
- // 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("O");
- int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
- if (nFirstPageObjNum < 0)
- return IPDF_DataAvail::DataError;
-
- FX_DWORD dwIndex = 0;
- FX_DWORD dwObjNum = 0;
- for (int j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
- dwIndex = m_dwIdentifierArray[offset + j];
- if (dwIndex >= m_dwSharedObjNumArray.GetSize())
- return IPDF_DataAvail::DataNotAvailable;
-
- dwObjNum = m_dwSharedObjNumArray[dwIndex];
- if (dwObjNum >= nFirstPageObjNum &&
- dwObjNum < nFirstPageObjNum + m_nFirstPageSharedObjs) {
- continue;
- }
-
- dwLength = GetItemLength(dwIndex, m_szSharedObjOffsetArray);
- // If two objects have the same offset, it should be treated as an error.
- if (!dwLength)
- return IPDF_DataAvail::DataError;
-
- if (!m_pDataAvail->IsDataAvail(m_szSharedObjOffsetArray[dwIndex], dwLength,
- pHints)) {
- return IPDF_DataAvail::DataNotAvailable;
- }
- }
- return IPDF_DataAvail::DataAvailable;
-}
-
-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("S") : nullptr;
- if (!pOffset || !pOffset->IsNumber())
- return FALSE;
-
- int shared_hint_table_offset = pOffset->GetInteger();
- 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 || shared_hint_table_offset <= 0 ||
- size < shared_hint_table_offset) {
- return FALSE;
- }
-
- CFX_BitStream bs;
- bs.Init(acc.GetData(), size);
- return ReadPageHintTable(&bs) &&
- ReadSharedObjHintTable(&bs, pdfium::base::checked_cast<FX_DWORD>(
- shared_hint_table_offset));
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamOffset() const {
- if (!m_pLinearizedDict)
- return -1;
-
- CPDF_Array* pRange = m_pLinearizedDict->GetArrayBy("H");
- if (!pRange)
- return -1;
-
- CPDF_Object* pStreamOffset = pRange->GetElementValue(0);
- if (!pStreamOffset)
- return -1;
-
- return pStreamOffset->GetInteger();
-}
-
-int CPDF_HintTables::ReadPrimaryHintStreamLength() const {
- if (!m_pLinearizedDict)
- return -1;
-
- CPDF_Array* pRange = m_pLinearizedDict->GetArrayBy("H");
- if (!pRange)
- return -1;
-
- CPDF_Object* pStreamLen = pRange->GetElementValue(1);
- if (!pStreamLen)
- return -1;
-
- return pStreamLen->GetInteger();
-}
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