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Unified Diff: core/fpdfapi/fpdf_parser/cpdf_parser.cpp

Issue 2392603004: Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser (Closed)
Patch Set: Rebase to master Created 4 years, 2 months ago
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Index: core/fpdfapi/fpdf_parser/cpdf_parser.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
deleted file mode 100644
index 182d3869bcf1b867ca42032134d0bccc75a94866..0000000000000000000000000000000000000000
--- a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
+++ /dev/null
@@ -1,1637 +0,0 @@
-// Copyright 2016 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/fpdfapi/fpdf_parser/cpdf_parser.h"
-
-#include <vector>
-
-#include "core/fpdfapi/fpdf_parser/cpdf_array.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_crypto_handler.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_document.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_number.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_reference.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_security_handler.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream_acc.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_syntax_parser.h"
-#include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
-#include "core/fxcrt/fx_ext.h"
-#include "core/fxcrt/fx_safe_types.h"
-#include "third_party/base/stl_util.h"
-
-namespace {
-
-// A limit on the size of the xref table. Theoretical limits are higher, but
-// this may be large enough in practice.
-const int32_t kMaxXRefSize = 1048576;
-
-uint32_t GetVarInt(const uint8_t* p, int32_t n) {
- uint32_t result = 0;
- for (int32_t i = 0; i < n; ++i)
- result = result * 256 + p[i];
- return result;
-}
-
-int32_t GetStreamNCount(CPDF_StreamAcc* pObjStream) {
- return pObjStream->GetDict()->GetIntegerFor("N");
-}
-
-int32_t GetStreamFirst(CPDF_StreamAcc* pObjStream) {
- return pObjStream->GetDict()->GetIntegerFor("First");
-}
-
-} // namespace
-
-CPDF_Parser::CPDF_Parser()
- : m_pDocument(nullptr),
- m_bHasParsed(false),
- m_bOwnFileRead(true),
- m_FileVersion(0),
- m_pTrailer(nullptr),
- m_pEncryptDict(nullptr),
- m_bVersionUpdated(false),
- m_pLinearized(nullptr),
- m_dwFirstPageNo(0),
- m_dwXrefStartObjNum(0) {
- m_pSyntax.reset(new CPDF_SyntaxParser);
-}
-
-CPDF_Parser::~CPDF_Parser() {
- if (m_pTrailer)
- m_pTrailer->Release();
-
- ReleaseEncryptHandler();
- SetEncryptDictionary(nullptr);
-
- if (m_bOwnFileRead && m_pSyntax->m_pFileAccess) {
- m_pSyntax->m_pFileAccess->Release();
- m_pSyntax->m_pFileAccess = nullptr;
- }
-
- int32_t iLen = m_Trailers.GetSize();
- for (int32_t i = 0; i < iLen; ++i) {
- if (CPDF_Dictionary* trailer = m_Trailers.GetAt(i))
- trailer->Release();
- }
-
- if (m_pLinearized)
- m_pLinearized->Release();
-}
-
-uint32_t CPDF_Parser::GetLastObjNum() const {
- return m_ObjectInfo.empty() ? 0 : m_ObjectInfo.rbegin()->first;
-}
-
-bool CPDF_Parser::IsValidObjectNumber(uint32_t objnum) const {
- return !m_ObjectInfo.empty() && objnum <= m_ObjectInfo.rbegin()->first;
-}
-
-FX_FILESIZE CPDF_Parser::GetObjectPositionOrZero(uint32_t objnum) const {
- auto it = m_ObjectInfo.find(objnum);
- return it != m_ObjectInfo.end() ? it->second.pos : 0;
-}
-
-uint8_t CPDF_Parser::GetObjectType(uint32_t objnum) const {
- ASSERT(IsValidObjectNumber(objnum));
- auto it = m_ObjectInfo.find(objnum);
- return it != m_ObjectInfo.end() ? it->second.type : 0;
-}
-
-uint16_t CPDF_Parser::GetObjectGenNum(uint32_t objnum) const {
- ASSERT(IsValidObjectNumber(objnum));
- auto it = m_ObjectInfo.find(objnum);
- return it != m_ObjectInfo.end() ? it->second.gennum : 0;
-}
-
-bool CPDF_Parser::IsObjectFreeOrNull(uint32_t objnum) const {
- uint8_t type = GetObjectType(objnum);
- return type == 0 || type == 255;
-}
-
-void CPDF_Parser::SetEncryptDictionary(CPDF_Dictionary* pDict) {
- m_pEncryptDict = pDict;
-}
-
-CPDF_CryptoHandler* CPDF_Parser::GetCryptoHandler() {
- return m_pSyntax->m_pCryptoHandler.get();
-}
-
-IFX_FileRead* CPDF_Parser::GetFileAccess() const {
- return m_pSyntax->m_pFileAccess;
-}
-
-void CPDF_Parser::ShrinkObjectMap(uint32_t objnum) {
- if (objnum == 0) {
- m_ObjectInfo.clear();
- return;
- }
-
- auto it = m_ObjectInfo.lower_bound(objnum);
- while (it != m_ObjectInfo.end()) {
- auto saved_it = it++;
- m_ObjectInfo.erase(saved_it);
- }
-
- if (!pdfium::ContainsKey(m_ObjectInfo, objnum - 1))
- m_ObjectInfo[objnum - 1].pos = 0;
-}
-
-CPDF_Parser::Error CPDF_Parser::StartParse(IFX_FileRead* pFileAccess,
- CPDF_Document* pDocument) {
- ASSERT(!m_bHasParsed);
- m_bHasParsed = true;
-
- m_bXRefStream = FALSE;
- m_LastXRefOffset = 0;
- m_bOwnFileRead = true;
-
- int32_t offset = GetHeaderOffset(pFileAccess);
- if (offset == -1) {
- if (pFileAccess)
- pFileAccess->Release();
- return FORMAT_ERROR;
- }
- m_pSyntax->InitParser(pFileAccess, offset);
-
- uint8_t ch;
- if (!m_pSyntax->GetCharAt(5, ch))
- return FORMAT_ERROR;
- if (std::isdigit(ch))
- m_FileVersion = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch)) * 10;
-
- if (!m_pSyntax->GetCharAt(7, ch))
- return FORMAT_ERROR;
- if (std::isdigit(ch))
- m_FileVersion += FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
-
- if (m_pSyntax->m_FileLen < m_pSyntax->m_HeaderOffset + 9)
- return FORMAT_ERROR;
-
- m_pSyntax->RestorePos(m_pSyntax->m_FileLen - m_pSyntax->m_HeaderOffset - 9);
- m_pDocument = pDocument;
-
- FX_BOOL bXRefRebuilt = FALSE;
- if (m_pSyntax->SearchWord("startxref", TRUE, FALSE, 4096)) {
- m_SortedOffset.insert(m_pSyntax->SavePos());
- m_pSyntax->GetKeyword();
-
- bool bNumber;
- CFX_ByteString xrefpos_str = m_pSyntax->GetNextWord(&bNumber);
- if (!bNumber)
- return FORMAT_ERROR;
-
- m_LastXRefOffset = (FX_FILESIZE)FXSYS_atoi64(xrefpos_str.c_str());
- if (!LoadAllCrossRefV4(m_LastXRefOffset) &&
- !LoadAllCrossRefV5(m_LastXRefOffset)) {
- if (!RebuildCrossRef())
- return FORMAT_ERROR;
-
- bXRefRebuilt = TRUE;
- m_LastXRefOffset = 0;
- }
- } else {
- if (!RebuildCrossRef())
- return FORMAT_ERROR;
-
- bXRefRebuilt = TRUE;
- }
- Error eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
-
- m_pDocument->LoadDoc();
- if (!m_pDocument->GetRoot() || m_pDocument->GetPageCount() == 0) {
- if (bXRefRebuilt)
- return FORMAT_ERROR;
-
- ReleaseEncryptHandler();
- if (!RebuildCrossRef())
- return FORMAT_ERROR;
-
- eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
-
- m_pDocument->LoadDoc();
- if (!m_pDocument->GetRoot())
- return FORMAT_ERROR;
- }
- if (GetRootObjNum() == 0) {
- ReleaseEncryptHandler();
- if (!RebuildCrossRef() || GetRootObjNum() == 0)
- return FORMAT_ERROR;
-
- eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
- }
- if (m_pSecurityHandler && !m_pSecurityHandler->IsMetadataEncrypted()) {
- CPDF_Reference* pMetadata =
- ToReference(m_pDocument->GetRoot()->GetObjectFor("Metadata"));
- if (pMetadata)
- m_pSyntax->m_MetadataObjnum = pMetadata->GetRefObjNum();
- }
- return SUCCESS;
-}
-CPDF_Parser::Error CPDF_Parser::SetEncryptHandler() {
- ReleaseEncryptHandler();
- SetEncryptDictionary(nullptr);
-
- if (!m_pTrailer)
- return FORMAT_ERROR;
-
- CPDF_Object* pEncryptObj = m_pTrailer->GetObjectFor("Encrypt");
- if (pEncryptObj) {
- if (CPDF_Dictionary* pEncryptDict = pEncryptObj->AsDictionary()) {
- SetEncryptDictionary(pEncryptDict);
- } else if (CPDF_Reference* pRef = pEncryptObj->AsReference()) {
- pEncryptObj = m_pDocument->GetOrParseIndirectObject(pRef->GetRefObjNum());
- if (pEncryptObj)
- SetEncryptDictionary(pEncryptObj->GetDict());
- }
- }
-
- if (m_pEncryptDict) {
- CFX_ByteString filter = m_pEncryptDict->GetStringFor("Filter");
- std::unique_ptr<CPDF_SecurityHandler> pSecurityHandler;
- Error err = HANDLER_ERROR;
- if (filter == "Standard") {
- pSecurityHandler.reset(new CPDF_SecurityHandler);
- err = PASSWORD_ERROR;
- }
- if (!pSecurityHandler)
- return HANDLER_ERROR;
-
- if (!pSecurityHandler->OnInit(this, m_pEncryptDict))
- return err;
-
- m_pSecurityHandler = std::move(pSecurityHandler);
- std::unique_ptr<CPDF_CryptoHandler> pCryptoHandler(
- m_pSecurityHandler->CreateCryptoHandler());
- if (!pCryptoHandler->Init(m_pEncryptDict, m_pSecurityHandler.get()))
- return HANDLER_ERROR;
- m_pSyntax->SetEncrypt(std::move(pCryptoHandler));
- }
- return SUCCESS;
-}
-
-void CPDF_Parser::ReleaseEncryptHandler() {
- m_pSyntax->m_pCryptoHandler.reset();
- m_pSecurityHandler.reset();
-}
-
-FX_FILESIZE CPDF_Parser::GetObjectOffset(uint32_t objnum) const {
- if (!IsValidObjectNumber(objnum))
- return 0;
-
- if (GetObjectType(objnum) == 1)
- return GetObjectPositionOrZero(objnum);
-
- if (GetObjectType(objnum) == 2) {
- FX_FILESIZE pos = GetObjectPositionOrZero(objnum);
- return GetObjectPositionOrZero(pos);
- }
- return 0;
-}
-
-// Ideally, all the cross reference entries should be verified.
-// In reality, we rarely see well-formed cross references don't match
-// with the objects. crbug/602650 showed a case where object numbers
-// in the cross reference table are all off by one.
-bool CPDF_Parser::VerifyCrossRefV4() {
- for (const auto& it : m_ObjectInfo) {
- if (it.second.pos == 0)
- continue;
- // Find the first non-zero position.
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- m_pSyntax->RestorePos(it.second.pos);
- bool is_num = false;
- CFX_ByteString num_str = m_pSyntax->GetNextWord(&is_num);
- m_pSyntax->RestorePos(SavedPos);
- if (!is_num || num_str.IsEmpty() ||
- FXSYS_atoui(num_str.c_str()) != it.first) {
- // If the object number read doesn't match the one stored,
- // something is wrong with the cross reference table.
- return false;
- } else {
- return true;
- }
- }
- return true;
-}
-
-FX_BOOL CPDF_Parser::LoadAllCrossRefV4(FX_FILESIZE xrefpos) {
- if (!LoadCrossRefV4(xrefpos, 0, TRUE))
- return FALSE;
-
- m_pTrailer = LoadTrailerV4();
- if (!m_pTrailer)
- return FALSE;
-
- int32_t xrefsize = GetDirectInteger(m_pTrailer, "Size");
- if (xrefsize > 0 && xrefsize <= kMaxXRefSize)
- ShrinkObjectMap(xrefsize);
-
- std::vector<FX_FILESIZE> CrossRefList;
- std::vector<FX_FILESIZE> XRefStreamList;
- std::set<FX_FILESIZE> seen_xrefpos;
-
- CrossRefList.push_back(xrefpos);
- XRefStreamList.push_back(GetDirectInteger(m_pTrailer, "XRefStm"));
- seen_xrefpos.insert(xrefpos);
-
- // When |m_pTrailer| doesn't have Prev entry or Prev entry value is not
- // numerical, GetDirectInteger() returns 0. Loading will end.
- xrefpos = GetDirectInteger(m_pTrailer, "Prev");
- while (xrefpos) {
- // Check for circular references.
- if (pdfium::ContainsKey(seen_xrefpos, xrefpos))
- return FALSE;
-
- seen_xrefpos.insert(xrefpos);
-
- // SLOW ...
- CrossRefList.insert(CrossRefList.begin(), xrefpos);
- LoadCrossRefV4(xrefpos, 0, TRUE);
-
- std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>> pDict(
- LoadTrailerV4());
- if (!pDict)
- return FALSE;
-
- xrefpos = GetDirectInteger(pDict.get(), "Prev");
-
- // SLOW ...
- XRefStreamList.insert(XRefStreamList.begin(),
- pDict->GetIntegerFor("XRefStm"));
- m_Trailers.Add(pDict.release());
- }
-
- for (size_t i = 0; i < CrossRefList.size(); ++i) {
- if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE))
- return FALSE;
- if (i == 0 && !VerifyCrossRefV4())
- return FALSE;
- }
- return TRUE;
-}
-
-FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV4(FX_FILESIZE xrefpos,
- uint32_t dwObjCount) {
- if (!LoadLinearizedCrossRefV4(xrefpos, dwObjCount))
- return FALSE;
-
- m_pTrailer = LoadTrailerV4();
- if (!m_pTrailer)
- return FALSE;
-
- int32_t xrefsize = GetDirectInteger(m_pTrailer, "Size");
- if (xrefsize == 0)
- return FALSE;
-
- std::vector<FX_FILESIZE> CrossRefList;
- std::vector<FX_FILESIZE> XRefStreamList;
- std::set<FX_FILESIZE> seen_xrefpos;
-
- CrossRefList.push_back(xrefpos);
- XRefStreamList.push_back(GetDirectInteger(m_pTrailer, "XRefStm"));
- seen_xrefpos.insert(xrefpos);
-
- xrefpos = GetDirectInteger(m_pTrailer, "Prev");
- while (xrefpos) {
- // Check for circular references.
- if (pdfium::ContainsKey(seen_xrefpos, xrefpos))
- return FALSE;
-
- seen_xrefpos.insert(xrefpos);
-
- // SLOW ...
- CrossRefList.insert(CrossRefList.begin(), xrefpos);
- LoadCrossRefV4(xrefpos, 0, TRUE);
-
- std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>> pDict(
- LoadTrailerV4());
- if (!pDict)
- return FALSE;
-
- xrefpos = GetDirectInteger(pDict.get(), "Prev");
-
- // SLOW ...
- XRefStreamList.insert(XRefStreamList.begin(),
- pDict->GetIntegerFor("XRefStm"));
- m_Trailers.Add(pDict.release());
- }
-
- for (size_t i = 1; i < CrossRefList.size(); ++i) {
- if (!LoadCrossRefV4(CrossRefList[i], XRefStreamList[i], FALSE))
- return FALSE;
- }
- return TRUE;
-}
-
-FX_BOOL CPDF_Parser::LoadLinearizedCrossRefV4(FX_FILESIZE pos,
- uint32_t dwObjCount) {
- FX_FILESIZE dwStartPos = pos - m_pSyntax->m_HeaderOffset;
-
- m_pSyntax->RestorePos(dwStartPos);
- m_SortedOffset.insert(pos);
-
- uint32_t start_objnum = 0;
- uint32_t count = dwObjCount;
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
-
- const int32_t recordsize = 20;
- std::vector<char> buf(1024 * recordsize + 1);
- buf[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;
- uint32_t dwReadSize = block_size * recordsize;
- if ((FX_FILESIZE)(dwStartPos + dwReadSize) > m_pSyntax->m_FileLen)
- return FALSE;
-
- if (!m_pSyntax->ReadBlock(reinterpret_cast<uint8_t*>(buf.data()),
- dwReadSize)) {
- return FALSE;
- }
-
- for (int32_t i = 0; i < block_size; i++) {
- uint32_t objnum = start_objnum + block * 1024 + i;
- char* pEntry = &buf[i * recordsize];
- if (pEntry[17] == 'f') {
- m_ObjectInfo[objnum].pos = 0;
- m_ObjectInfo[objnum].type = 0;
- } else {
- int32_t offset = FXSYS_atoi(pEntry);
- if (offset == 0) {
- for (int32_t c = 0; c < 10; c++) {
- if (!std::isdigit(pEntry[c]))
- return FALSE;
- }
- }
-
- m_ObjectInfo[objnum].pos = offset;
- int32_t version = FXSYS_atoi(pEntry + 11);
- if (version >= 1)
- m_bVersionUpdated = true;
-
- m_ObjectInfo[objnum].gennum = version;
- if (m_ObjectInfo[objnum].pos < m_pSyntax->m_FileLen)
- m_SortedOffset.insert(m_ObjectInfo[objnum].pos);
-
- m_ObjectInfo[objnum].type = 1;
- }
- }
- }
- m_pSyntax->RestorePos(SavedPos + count * recordsize);
- return TRUE;
-}
-
-bool CPDF_Parser::LoadCrossRefV4(FX_FILESIZE pos,
- FX_FILESIZE streampos,
- FX_BOOL bSkip) {
- m_pSyntax->RestorePos(pos);
- if (m_pSyntax->GetKeyword() != "xref")
- return false;
-
- m_SortedOffset.insert(pos);
- if (streampos)
- m_SortedOffset.insert(streampos);
-
- while (1) {
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- bool bIsNumber;
- CFX_ByteString word = m_pSyntax->GetNextWord(&bIsNumber);
- if (word.IsEmpty())
- return false;
-
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- break;
- }
-
- uint32_t start_objnum = FXSYS_atoui(word.c_str());
- if (start_objnum >= kMaxObjectNumber)
- return false;
-
- uint32_t count = m_pSyntax->GetDirectNum();
- m_pSyntax->ToNextWord();
- SavedPos = m_pSyntax->SavePos();
- const int32_t recordsize = 20;
-
- m_dwXrefStartObjNum = start_objnum;
- if (!bSkip) {
- std::vector<char> buf(1024 * recordsize + 1);
- buf[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;
- m_pSyntax->ReadBlock(reinterpret_cast<uint8_t*>(buf.data()),
- block_size * recordsize);
-
- for (int32_t i = 0; i < block_size; i++) {
- uint32_t objnum = start_objnum + block * 1024 + i;
- char* pEntry = &buf[i * recordsize];
- if (pEntry[17] == 'f') {
- m_ObjectInfo[objnum].pos = 0;
- m_ObjectInfo[objnum].type = 0;
- } else {
- FX_FILESIZE offset = (FX_FILESIZE)FXSYS_atoi64(pEntry);
- if (offset == 0) {
- for (int32_t c = 0; c < 10; c++) {
- if (!std::isdigit(pEntry[c]))
- return false;
- }
- }
-
- m_ObjectInfo[objnum].pos = offset;
- int32_t version = FXSYS_atoi(pEntry + 11);
- if (version >= 1)
- m_bVersionUpdated = true;
-
- m_ObjectInfo[objnum].gennum = version;
- if (m_ObjectInfo[objnum].pos < m_pSyntax->m_FileLen)
- m_SortedOffset.insert(m_ObjectInfo[objnum].pos);
-
- m_ObjectInfo[objnum].type = 1;
- }
- }
- }
- }
- m_pSyntax->RestorePos(SavedPos + count * recordsize);
- }
- return !streampos || LoadCrossRefV5(&streampos, FALSE);
-}
-
-FX_BOOL CPDF_Parser::LoadAllCrossRefV5(FX_FILESIZE xrefpos) {
- if (!LoadCrossRefV5(&xrefpos, TRUE))
- return FALSE;
-
- std::set<FX_FILESIZE> seen_xrefpos;
- while (xrefpos) {
- seen_xrefpos.insert(xrefpos);
- if (!LoadCrossRefV5(&xrefpos, FALSE))
- return FALSE;
-
- // Check for circular references.
- if (pdfium::ContainsKey(seen_xrefpos, xrefpos))
- return FALSE;
- }
- m_ObjectStreamMap.clear();
- m_bXRefStream = TRUE;
- return TRUE;
-}
-
-FX_BOOL CPDF_Parser::RebuildCrossRef() {
- m_ObjectInfo.clear();
- m_SortedOffset.clear();
- if (m_pTrailer) {
- m_pTrailer->Release();
- m_pTrailer = nullptr;
- }
-
- ParserState state = ParserState::kDefault;
-
- int32_t inside_index = 0;
- uint32_t objnum = 0;
- uint32_t gennum = 0;
- int32_t depth = 0;
-
- const uint32_t kBufferSize = 4096;
- std::vector<uint8_t> buffer(kBufferSize);
-
- FX_FILESIZE pos = m_pSyntax->m_HeaderOffset;
- FX_FILESIZE start_pos = 0;
- FX_FILESIZE start_pos1 = 0;
- FX_FILESIZE last_obj = -1;
- FX_FILESIZE last_xref = -1;
- FX_FILESIZE last_trailer = -1;
-
- while (pos < m_pSyntax->m_FileLen) {
- const FX_FILESIZE saved_pos = pos;
- bool bOverFlow = false;
- uint32_t size =
- std::min((uint32_t)(m_pSyntax->m_FileLen - pos), kBufferSize);
- if (!m_pSyntax->m_pFileAccess->ReadBlock(buffer.data(), pos, size))
- break;
-
- for (uint32_t i = 0; i < size; i++) {
- uint8_t byte = buffer[i];
- switch (state) {
- case ParserState::kDefault:
- if (PDFCharIsWhitespace(byte)) {
- state = ParserState::kWhitespace;
- } else if (std::isdigit(byte)) {
- --i;
- state = ParserState::kWhitespace;
- } else if (byte == '%') {
- inside_index = 0;
- state = ParserState::kComment;
- } else if (byte == '(') {
- state = ParserState::kString;
- depth = 1;
- } else if (byte == '<') {
- inside_index = 1;
- state = ParserState::kHexString;
- } else if (byte == '\\') {
- state = ParserState::kEscapedString;
- } else if (byte == 't') {
- state = ParserState::kTrailer;
- inside_index = 1;
- }
- break;
-
- case ParserState::kWhitespace:
- if (std::isdigit(byte)) {
- start_pos = pos + i;
- state = ParserState::kObjNum;
- objnum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
- } else if (byte == 't') {
- state = ParserState::kTrailer;
- inside_index = 1;
- } else if (byte == 'x') {
- state = ParserState::kXref;
- inside_index = 1;
- } else if (!PDFCharIsWhitespace(byte)) {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kObjNum:
- if (std::isdigit(byte)) {
- objnum =
- objnum * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
- } else if (PDFCharIsWhitespace(byte)) {
- state = ParserState::kPostObjNum;
- } else {
- --i;
- state = ParserState::kEndObj;
- inside_index = 0;
- }
- break;
-
- case ParserState::kPostObjNum:
- if (std::isdigit(byte)) {
- start_pos1 = pos + i;
- state = ParserState::kGenNum;
- gennum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
- } else if (byte == 't') {
- state = ParserState::kTrailer;
- inside_index = 1;
- } else if (!PDFCharIsWhitespace(byte)) {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kGenNum:
- if (std::isdigit(byte)) {
- gennum =
- gennum * 10 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
- } else if (PDFCharIsWhitespace(byte)) {
- state = ParserState::kPostGenNum;
- } else {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kPostGenNum:
- if (byte == 'o') {
- state = ParserState::kBeginObj;
- inside_index = 1;
- } else if (std::isdigit(byte)) {
- objnum = gennum;
- gennum = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(byte));
- start_pos = start_pos1;
- start_pos1 = pos + i;
- state = ParserState::kGenNum;
- } else if (byte == 't') {
- state = ParserState::kTrailer;
- inside_index = 1;
- } else if (!PDFCharIsWhitespace(byte)) {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kBeginObj:
- switch (inside_index) {
- case 1:
- if (byte != 'b') {
- --i;
- state = ParserState::kDefault;
- } else {
- inside_index++;
- }
- break;
- case 2:
- if (byte != 'j') {
- --i;
- state = ParserState::kDefault;
- } else {
- inside_index++;
- }
- break;
- case 3:
- if (PDFCharIsWhitespace(byte) || PDFCharIsDelimiter(byte)) {
- FX_FILESIZE obj_pos = start_pos - m_pSyntax->m_HeaderOffset;
- m_SortedOffset.insert(obj_pos);
- last_obj = start_pos;
- FX_FILESIZE obj_end = 0;
- CPDF_Object* pObject = ParseIndirectObjectAtByStrict(
- m_pDocument, obj_pos, objnum, &obj_end);
- if (CPDF_Stream* pStream = ToStream(pObject)) {
- if (CPDF_Dictionary* pDict = pStream->GetDict()) {
- if ((pDict->KeyExist("Type")) &&
- (pDict->GetStringFor("Type") == "XRef" &&
- pDict->KeyExist("Size"))) {
- CPDF_Object* pRoot = pDict->GetObjectFor("Root");
- if (pRoot && pRoot->GetDict() &&
- pRoot->GetDict()->GetObjectFor("Pages")) {
- if (m_pTrailer)
- m_pTrailer->Release();
- m_pTrailer = ToDictionary(pDict->Clone());
- }
- }
- }
- }
-
- FX_FILESIZE offset = 0;
- m_pSyntax->RestorePos(obj_pos);
- offset = m_pSyntax->FindTag("obj", 0);
- if (offset == -1)
- offset = 0;
- else
- offset += 3;
-
- FX_FILESIZE nLen = obj_end - obj_pos - offset;
- if ((uint32_t)nLen > size - i) {
- pos = obj_end + m_pSyntax->m_HeaderOffset;
- bOverFlow = true;
- } else {
- i += (uint32_t)nLen;
- }
-
- if (!m_ObjectInfo.empty() && IsValidObjectNumber(objnum) &&
- m_ObjectInfo[objnum].pos) {
- if (pObject) {
- uint32_t oldgen = GetObjectGenNum(objnum);
- m_ObjectInfo[objnum].pos = obj_pos;
- m_ObjectInfo[objnum].gennum = gennum;
- if (oldgen != gennum)
- m_bVersionUpdated = true;
- }
- } else {
- m_ObjectInfo[objnum].pos = obj_pos;
- m_ObjectInfo[objnum].type = 1;
- m_ObjectInfo[objnum].gennum = gennum;
- }
-
- if (pObject)
- pObject->Release();
- }
- --i;
- state = ParserState::kDefault;
- break;
- }
- break;
-
- case ParserState::kTrailer:
- if (inside_index == 7) {
- if (PDFCharIsWhitespace(byte) || PDFCharIsDelimiter(byte)) {
- last_trailer = pos + i - 7;
- m_pSyntax->RestorePos(pos + i - m_pSyntax->m_HeaderOffset);
-
- CPDF_Object* pObj = m_pSyntax->GetObject(m_pDocument, 0, 0, true);
- if (pObj) {
- if (!pObj->IsDictionary() && !pObj->AsStream()) {
- pObj->Release();
- } else {
- CPDF_Stream* pStream = pObj->AsStream();
- if (CPDF_Dictionary* pTrailer =
- pStream ? pStream->GetDict() : pObj->AsDictionary()) {
- if (m_pTrailer) {
- CPDF_Object* pRoot = pTrailer->GetObjectFor("Root");
- CPDF_Reference* pRef = ToReference(pRoot);
- if (!pRoot ||
- (pRef && IsValidObjectNumber(pRef->GetRefObjNum()) &&
- m_ObjectInfo[pRef->GetRefObjNum()].pos != 0)) {
- auto it = pTrailer->begin();
- while (it != pTrailer->end()) {
- const CFX_ByteString& key = it->first;
- CPDF_Object* pElement = it->second;
- ++it;
- uint32_t dwObjNum =
- pElement ? pElement->GetObjNum() : 0;
- if (dwObjNum) {
- m_pTrailer->SetReferenceFor(key, m_pDocument,
- dwObjNum);
- } else {
- m_pTrailer->SetFor(key, pElement->Clone());
- }
- }
- }
- pObj->Release();
- } else {
- if (pObj->IsStream()) {
- m_pTrailer = ToDictionary(pTrailer->Clone());
- pObj->Release();
- } else {
- m_pTrailer = pTrailer;
- }
-
- FX_FILESIZE dwSavePos = m_pSyntax->SavePos();
- CFX_ByteString strWord = m_pSyntax->GetKeyword();
- if (!strWord.Compare("startxref")) {
- bool bNumber;
- CFX_ByteString bsOffset =
- m_pSyntax->GetNextWord(&bNumber);
- if (bNumber)
- m_LastXRefOffset = FXSYS_atoi(bsOffset.c_str());
- }
- m_pSyntax->RestorePos(dwSavePos);
- }
- } else {
- pObj->Release();
- }
- }
- }
- }
- --i;
- state = ParserState::kDefault;
- } else if (byte == "trailer"[inside_index]) {
- inside_index++;
- } else {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kXref:
- if (inside_index == 4) {
- last_xref = pos + i - 4;
- state = ParserState::kWhitespace;
- } else if (byte == "xref"[inside_index]) {
- inside_index++;
- } else {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kComment:
- if (PDFCharIsLineEnding(byte))
- state = ParserState::kDefault;
- break;
-
- case ParserState::kString:
- if (byte == ')') {
- if (depth > 0)
- depth--;
- } else if (byte == '(') {
- depth++;
- }
-
- if (!depth)
- state = ParserState::kDefault;
- break;
-
- case ParserState::kHexString:
- if (byte == '>' || (byte == '<' && inside_index == 1))
- state = ParserState::kDefault;
- inside_index = 0;
- break;
-
- case ParserState::kEscapedString:
- if (PDFCharIsDelimiter(byte) || PDFCharIsWhitespace(byte)) {
- --i;
- state = ParserState::kDefault;
- }
- break;
-
- case ParserState::kEndObj:
- if (PDFCharIsWhitespace(byte)) {
- state = ParserState::kDefault;
- } else if (byte == '%' || byte == '(' || byte == '<' ||
- byte == '\\') {
- state = ParserState::kDefault;
- --i;
- } else if (inside_index == 6) {
- state = ParserState::kDefault;
- --i;
- } else if (byte == "endobj"[inside_index]) {
- inside_index++;
- }
- break;
- }
-
- if (bOverFlow) {
- size = 0;
- break;
- }
- }
- pos += size;
-
- // If the position has not changed at all or went backwards in a loop
- // iteration, then break out to prevent infinite looping.
- if (pos <= saved_pos)
- break;
- }
-
- if (last_xref != -1 && last_xref > last_obj)
- last_trailer = last_xref;
- else if (last_trailer == -1 || last_xref < last_obj)
- last_trailer = m_pSyntax->m_FileLen;
-
- m_SortedOffset.insert(last_trailer - m_pSyntax->m_HeaderOffset);
- return m_pTrailer && !m_ObjectInfo.empty();
-}
-
-FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
- CPDF_Object* pObject = ParseIndirectObjectAt(m_pDocument, *pos, 0);
- if (!pObject)
- return FALSE;
-
- if (m_pDocument) {
- CPDF_Dictionary* pRootDict = m_pDocument->GetRoot();
- if (pRootDict && pRootDict->GetObjNum() == pObject->m_ObjNum) {
- // If |pObject| has an objnum assigned then this will leak as Release()
- // will early exit.
- if (pObject->IsStream())
- pObject->Release();
- return FALSE;
- }
- if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(pObject->m_ObjNum,
- pObject)) {
- return FALSE;
- }
- }
-
- CPDF_Stream* pStream = pObject->AsStream();
- if (!pStream)
- return FALSE;
-
- CPDF_Dictionary* pDict = pStream->GetDict();
- *pos = pDict->GetIntegerFor("Prev");
- int32_t size = pDict->GetIntegerFor("Size");
- if (size < 0) {
- pStream->Release();
- return FALSE;
- }
-
- CPDF_Dictionary* pNewTrailer = ToDictionary(pDict->Clone());
- if (bMainXRef) {
- m_pTrailer = pNewTrailer;
- ShrinkObjectMap(size);
- for (auto& it : m_ObjectInfo)
- it.second.type = 0;
- } else {
- m_Trailers.Add(pNewTrailer);
- }
-
- std::vector<std::pair<int32_t, int32_t>> arrIndex;
- CPDF_Array* pArray = pDict->GetArrayFor("Index");
- if (pArray) {
- for (size_t i = 0; i < pArray->GetCount() / 2; i++) {
- CPDF_Object* pStartNumObj = pArray->GetObjectAt(i * 2);
- CPDF_Object* pCountObj = pArray->GetObjectAt(i * 2 + 1);
-
- if (ToNumber(pStartNumObj) && ToNumber(pCountObj)) {
- 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 = pDict->GetArrayFor("W");
- if (!pArray) {
- pStream->Release();
- return FALSE;
- }
-
- CFX_ArrayTemplate<uint32_t> WidthArray;
- FX_SAFE_UINT32 dwAccWidth = 0;
- for (size_t i = 0; i < pArray->GetCount(); ++i) {
- WidthArray.Add(pArray->GetIntegerAt(i));
- dwAccWidth += WidthArray[i];
- }
-
- if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3) {
- pStream->Release();
- return FALSE;
- }
-
- uint32_t totalWidth = dwAccWidth.ValueOrDie();
- CPDF_StreamAcc acc;
- acc.LoadAllData(pStream);
-
- const uint8_t* pData = acc.GetData();
- uint32_t dwTotalSize = acc.GetSize();
- uint32_t segindex = 0;
- for (uint32_t i = 0; i < arrIndex.size(); i++) {
- int32_t startnum = arrIndex[i].first;
- if (startnum < 0)
- continue;
-
- m_dwXrefStartObjNum =
- pdfium::base::checked_cast<uint32_t, int32_t>(startnum);
- uint32_t count =
- pdfium::base::checked_cast<uint32_t, int32_t>(arrIndex[i].second);
- FX_SAFE_UINT32 dwCaculatedSize = segindex;
- dwCaculatedSize += count;
- dwCaculatedSize *= totalWidth;
- if (!dwCaculatedSize.IsValid() ||
- dwCaculatedSize.ValueOrDie() > dwTotalSize) {
- continue;
- }
-
- const uint8_t* segstart = pData + segindex * totalWidth;
- FX_SAFE_UINT32 dwMaxObjNum = startnum;
- dwMaxObjNum += count;
- uint32_t dwV5Size = m_ObjectInfo.empty() ? 0 : GetLastObjNum() + 1;
- if (!dwMaxObjNum.IsValid() || dwMaxObjNum.ValueOrDie() > dwV5Size)
- continue;
-
- for (uint32_t 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 (GetObjectType(startnum + j) == 255) {
- FX_FILESIZE offset =
- GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
- m_ObjectInfo[startnum + j].pos = offset;
- m_SortedOffset.insert(offset);
- continue;
- }
-
- if (GetObjectType(startnum + j))
- continue;
-
- m_ObjectInfo[startnum + j].type = type;
- if (type == 0) {
- m_ObjectInfo[startnum + j].pos = 0;
- } else {
- FX_FILESIZE offset =
- GetVarInt(entrystart + WidthArray[0], WidthArray[1]);
- m_ObjectInfo[startnum + j].pos = offset;
- if (type == 1) {
- m_SortedOffset.insert(offset);
- } else {
- if (offset < 0 || !IsValidObjectNumber(offset)) {
- pStream->Release();
- return FALSE;
- }
- m_ObjectInfo[offset].type = 255;
- }
- }
- }
- segindex += count;
- }
- pStream->Release();
- return TRUE;
-}
-
-CPDF_Array* CPDF_Parser::GetIDArray() {
- CPDF_Object* pID = m_pTrailer ? m_pTrailer->GetObjectFor("ID") : nullptr;
- if (!pID)
- return nullptr;
-
- if (CPDF_Reference* pRef = pID->AsReference()) {
- pID = ParseIndirectObject(nullptr, pRef->GetRefObjNum());
- m_pTrailer->SetFor("ID", pID);
- }
- return ToArray(pID);
-}
-
-uint32_t CPDF_Parser::GetRootObjNum() {
- CPDF_Reference* pRef =
- ToReference(m_pTrailer ? m_pTrailer->GetObjectFor("Root") : nullptr);
- return pRef ? pRef->GetRefObjNum() : 0;
-}
-
-uint32_t CPDF_Parser::GetInfoObjNum() {
- CPDF_Reference* pRef =
- ToReference(m_pTrailer ? m_pTrailer->GetObjectFor("Info") : nullptr);
- return pRef ? pRef->GetRefObjNum() : 0;
-}
-
-CPDF_Object* CPDF_Parser::ParseIndirectObject(
- CPDF_IndirectObjectHolder* pObjList,
- uint32_t objnum) {
- if (!IsValidObjectNumber(objnum))
- return nullptr;
-
- // Prevent circular parsing the same object.
- if (pdfium::ContainsKey(m_ParsingObjNums, objnum))
- return nullptr;
-
- pdfium::ScopedSetInsertion<uint32_t> local_insert(&m_ParsingObjNums, objnum);
- if (GetObjectType(objnum) == 1 || GetObjectType(objnum) == 255) {
- FX_FILESIZE pos = m_ObjectInfo[objnum].pos;
- if (pos <= 0)
- return nullptr;
- return ParseIndirectObjectAt(pObjList, pos, objnum);
- }
- if (GetObjectType(objnum) != 2)
- return nullptr;
-
- CPDF_StreamAcc* pObjStream = GetObjectStream(m_ObjectInfo[objnum].pos);
- if (!pObjStream)
- return nullptr;
-
- ScopedFileStream file(FX_CreateMemoryStream(
- (uint8_t*)pObjStream->GetData(), (size_t)pObjStream->GetSize(), FALSE));
- CPDF_SyntaxParser syntax;
- syntax.InitParser(file.get(), 0);
- const int32_t offset = GetStreamFirst(pObjStream);
-
- // Read object numbers from |pObjStream| into a cache.
- if (!pdfium::ContainsKey(m_ObjCache, pObjStream)) {
- for (int32_t i = GetStreamNCount(pObjStream); i > 0; --i) {
- uint32_t thisnum = syntax.GetDirectNum();
- uint32_t thisoff = syntax.GetDirectNum();
- m_ObjCache[pObjStream][thisnum] = thisoff;
- }
- }
-
- const auto it = m_ObjCache[pObjStream].find(objnum);
- if (it == m_ObjCache[pObjStream].end())
- return nullptr;
-
- syntax.RestorePos(offset + it->second);
- return syntax.GetObject(pObjList, 0, 0, true);
-}
-
-CPDF_StreamAcc* CPDF_Parser::GetObjectStream(uint32_t objnum) {
- auto it = m_ObjectStreamMap.find(objnum);
- if (it != m_ObjectStreamMap.end())
- return it->second.get();
-
- if (!m_pDocument)
- return nullptr;
-
- const CPDF_Stream* pStream =
- ToStream(m_pDocument->GetOrParseIndirectObject(objnum));
- if (!pStream)
- return nullptr;
-
- CPDF_StreamAcc* pStreamAcc = new CPDF_StreamAcc;
- pStreamAcc->LoadAllData(pStream);
- m_ObjectStreamMap[objnum].reset(pStreamAcc);
- return pStreamAcc;
-}
-
-FX_FILESIZE CPDF_Parser::GetObjectSize(uint32_t objnum) const {
- if (!IsValidObjectNumber(objnum))
- return 0;
-
- if (GetObjectType(objnum) == 2)
- objnum = GetObjectPositionOrZero(objnum);
-
- if (GetObjectType(objnum) != 1 && GetObjectType(objnum) != 255)
- return 0;
-
- FX_FILESIZE offset = GetObjectPositionOrZero(objnum);
- if (offset == 0)
- return 0;
-
- auto it = m_SortedOffset.find(offset);
- if (it == m_SortedOffset.end() || ++it == m_SortedOffset.end())
- return 0;
-
- return *it - offset;
-}
-
-void CPDF_Parser::GetIndirectBinary(uint32_t objnum,
- uint8_t*& pBuffer,
- uint32_t& size) {
- pBuffer = nullptr;
- size = 0;
- if (!IsValidObjectNumber(objnum))
- return;
-
- if (GetObjectType(objnum) == 2) {
- CPDF_StreamAcc* pObjStream = GetObjectStream(m_ObjectInfo[objnum].pos);
- if (!pObjStream)
- return;
-
- int32_t offset = GetStreamFirst(pObjStream);
- const uint8_t* pData = pObjStream->GetData();
- uint32_t totalsize = pObjStream->GetSize();
- ScopedFileStream file(
- FX_CreateMemoryStream((uint8_t*)pData, (size_t)totalsize, FALSE));
-
- CPDF_SyntaxParser syntax;
- syntax.InitParser(file.get(), 0);
- for (int i = GetStreamNCount(pObjStream); i > 0; --i) {
- uint32_t thisnum = syntax.GetDirectNum();
- uint32_t thisoff = syntax.GetDirectNum();
- if (thisnum != objnum)
- continue;
-
- if (i == 1) {
- size = totalsize - (thisoff + offset);
- } else {
- syntax.GetDirectNum(); // Skip nextnum.
- uint32_t nextoff = syntax.GetDirectNum();
- size = nextoff - thisoff;
- }
-
- pBuffer = FX_Alloc(uint8_t, size);
- FXSYS_memcpy(pBuffer, pData + thisoff + offset, size);
- return;
- }
- return;
- }
-
- if (GetObjectType(objnum) != 1)
- return;
-
- FX_FILESIZE pos = m_ObjectInfo[objnum].pos;
- if (pos == 0)
- return;
-
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- m_pSyntax->RestorePos(pos);
-
- bool bIsNumber;
- CFX_ByteString word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return;
- }
-
- uint32_t parser_objnum = FXSYS_atoui(word.c_str());
- if (parser_objnum && parser_objnum != objnum) {
- m_pSyntax->RestorePos(SavedPos);
- return;
- }
-
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return;
- }
-
- if (m_pSyntax->GetKeyword() != "obj") {
- m_pSyntax->RestorePos(SavedPos);
- return;
- }
-
- auto it = m_SortedOffset.find(pos);
- if (it == m_SortedOffset.end() || ++it == m_SortedOffset.end()) {
- m_pSyntax->RestorePos(SavedPos);
- return;
- }
-
- FX_FILESIZE nextoff = *it;
- FX_BOOL bNextOffValid = FALSE;
- if (nextoff != pos) {
- m_pSyntax->RestorePos(nextoff);
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (word == "xref") {
- bNextOffValid = TRUE;
- } else if (bIsNumber) {
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (bIsNumber && m_pSyntax->GetKeyword() == "obj") {
- bNextOffValid = TRUE;
- }
- }
- }
-
- if (!bNextOffValid) {
- m_pSyntax->RestorePos(pos);
- while (1) {
- if (m_pSyntax->GetKeyword() == "endobj")
- break;
-
- if (m_pSyntax->SavePos() == m_pSyntax->m_FileLen)
- break;
- }
- nextoff = m_pSyntax->SavePos();
- }
-
- size = (uint32_t)(nextoff - pos);
- pBuffer = FX_Alloc(uint8_t, size);
- m_pSyntax->RestorePos(pos);
- m_pSyntax->ReadBlock(pBuffer, size);
- m_pSyntax->RestorePos(SavedPos);
-}
-
-CPDF_Object* CPDF_Parser::ParseIndirectObjectAt(
- CPDF_IndirectObjectHolder* pObjList,
- FX_FILESIZE pos,
- uint32_t objnum) {
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- m_pSyntax->RestorePos(pos);
- bool bIsNumber;
- CFX_ByteString word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- FX_FILESIZE objOffset = m_pSyntax->SavePos();
- objOffset -= word.GetLength();
- uint32_t parser_objnum = FXSYS_atoui(word.c_str());
- if (objnum && parser_objnum != objnum) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- uint32_t parser_gennum = FXSYS_atoui(word.c_str());
- if (m_pSyntax->GetKeyword() != "obj") {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- CPDF_Object* pObj =
- m_pSyntax->GetObject(pObjList, objnum, parser_gennum, true);
- m_pSyntax->SavePos();
-
- CFX_ByteString bsWord = m_pSyntax->GetKeyword();
- if (bsWord == "endobj")
- m_pSyntax->SavePos();
-
- m_pSyntax->RestorePos(SavedPos);
- if (pObj) {
- if (!objnum)
- pObj->m_ObjNum = parser_objnum;
- pObj->m_GenNum = parser_gennum;
- }
- return pObj;
-}
-
-CPDF_Object* CPDF_Parser::ParseIndirectObjectAtByStrict(
- CPDF_IndirectObjectHolder* pObjList,
- FX_FILESIZE pos,
- uint32_t objnum,
- FX_FILESIZE* pResultPos) {
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- m_pSyntax->RestorePos(pos);
-
- bool bIsNumber;
- CFX_ByteString word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- uint32_t parser_objnum = FXSYS_atoui(word.c_str());
- if (objnum && parser_objnum != objnum) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber) {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- uint32_t gennum = FXSYS_atoui(word.c_str());
- if (m_pSyntax->GetKeyword() != "obj") {
- m_pSyntax->RestorePos(SavedPos);
- return nullptr;
- }
-
- CPDF_Object* pObj = m_pSyntax->GetObjectForStrict(pObjList, objnum, gennum);
- if (pResultPos)
- *pResultPos = m_pSyntax->m_Pos;
-
- m_pSyntax->RestorePos(SavedPos);
- return pObj;
-}
-
-CPDF_Dictionary* CPDF_Parser::LoadTrailerV4() {
- if (m_pSyntax->GetKeyword() != "trailer")
- return nullptr;
-
- std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> pObj(
- m_pSyntax->GetObject(m_pDocument, 0, 0, true));
- if (!ToDictionary(pObj.get()))
- return nullptr;
- return pObj.release()->AsDictionary();
-}
-
-uint32_t CPDF_Parser::GetPermissions() const {
- if (!m_pSecurityHandler)
- return 0xFFFFFFFF;
-
- uint32_t dwPermission = m_pSecurityHandler->GetPermissions();
- if (m_pEncryptDict && m_pEncryptDict->GetStringFor("Filter") == "Standard") {
- // See PDF Reference 1.7, page 123, table 3.20.
- dwPermission &= 0xFFFFFFFC;
- dwPermission |= 0xFFFFF0C0;
- }
- return dwPermission;
-}
-
-FX_BOOL CPDF_Parser::IsLinearizedFile(IFX_FileRead* pFileAccess,
- uint32_t offset) {
- m_pSyntax->InitParser(pFileAccess, offset);
- m_pSyntax->RestorePos(m_pSyntax->m_HeaderOffset + 9);
-
- FX_FILESIZE SavedPos = m_pSyntax->SavePos();
- bool bIsNumber;
- CFX_ByteString word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber)
- return FALSE;
-
- uint32_t objnum = FXSYS_atoui(word.c_str());
- word = m_pSyntax->GetNextWord(&bIsNumber);
- if (!bIsNumber)
- return FALSE;
-
- uint32_t gennum = FXSYS_atoui(word.c_str());
- if (m_pSyntax->GetKeyword() != "obj") {
- m_pSyntax->RestorePos(SavedPos);
- return FALSE;
- }
-
- m_pLinearized = m_pSyntax->GetObject(nullptr, objnum, gennum, true);
- if (!m_pLinearized)
- return FALSE;
-
- CPDF_Dictionary* pDict = m_pLinearized->GetDict();
- if (pDict && pDict->GetObjectFor("Linearized")) {
- m_pSyntax->GetNextWord(nullptr);
-
- CPDF_Object* pLen = pDict->GetObjectFor("L");
- if (!pLen) {
- m_pLinearized->Release();
- m_pLinearized = nullptr;
- return FALSE;
- }
-
- if (pLen->GetInteger() != (int)pFileAccess->GetSize())
- return FALSE;
-
- if (CPDF_Number* pNo = ToNumber(pDict->GetObjectFor("P")))
- m_dwFirstPageNo = pNo->GetInteger();
-
- if (CPDF_Number* pTable = ToNumber(pDict->GetObjectFor("T")))
- m_LastXRefOffset = pTable->GetInteger();
-
- return TRUE;
- }
- m_pLinearized->Release();
- m_pLinearized = nullptr;
- return FALSE;
-}
-
-CPDF_Parser::Error CPDF_Parser::StartLinearizedParse(IFX_FileRead* pFileAccess,
- CPDF_Document* pDocument) {
- ASSERT(!m_bHasParsed);
-
- m_bXRefStream = FALSE;
- m_LastXRefOffset = 0;
- m_bOwnFileRead = true;
-
- int32_t offset = GetHeaderOffset(pFileAccess);
- if (offset == -1)
- return FORMAT_ERROR;
-
- if (!IsLinearizedFile(pFileAccess, offset)) {
- m_pSyntax->m_pFileAccess = nullptr;
- return StartParse(pFileAccess, std::move(pDocument));
- }
- m_bHasParsed = true;
- m_pDocument = pDocument;
-
- FX_FILESIZE dwFirstXRefOffset = m_pSyntax->SavePos();
-
- FX_BOOL bXRefRebuilt = FALSE;
- FX_BOOL bLoadV4 = LoadCrossRefV4(dwFirstXRefOffset, 0, FALSE);
- if (!bLoadV4 && !LoadCrossRefV5(&dwFirstXRefOffset, TRUE)) {
- if (!RebuildCrossRef())
- return FORMAT_ERROR;
-
- bXRefRebuilt = TRUE;
- m_LastXRefOffset = 0;
- }
-
- if (bLoadV4) {
- m_pTrailer = LoadTrailerV4();
- if (!m_pTrailer)
- return SUCCESS;
-
- int32_t xrefsize = GetDirectInteger(m_pTrailer, "Size");
- if (xrefsize > 0)
- ShrinkObjectMap(xrefsize);
- }
-
- Error eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
-
- m_pDocument->LoadLinearizedDoc(m_pLinearized->GetDict());
- if (!m_pDocument->GetRoot() || m_pDocument->GetPageCount() == 0) {
- if (bXRefRebuilt)
- return FORMAT_ERROR;
-
- ReleaseEncryptHandler();
- if (!RebuildCrossRef())
- return FORMAT_ERROR;
-
- eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
-
- m_pDocument->LoadLinearizedDoc(m_pLinearized->GetDict());
- if (!m_pDocument->GetRoot())
- return FORMAT_ERROR;
- }
-
- if (GetRootObjNum() == 0) {
- ReleaseEncryptHandler();
- if (!RebuildCrossRef() || GetRootObjNum() == 0)
- return FORMAT_ERROR;
-
- eRet = SetEncryptHandler();
- if (eRet != SUCCESS)
- return eRet;
- }
-
- if (m_pSecurityHandler && m_pSecurityHandler->IsMetadataEncrypted()) {
- if (CPDF_Reference* pMetadata =
- ToReference(m_pDocument->GetRoot()->GetObjectFor("Metadata")))
- m_pSyntax->m_MetadataObjnum = pMetadata->GetRefObjNum();
- }
- return SUCCESS;
-}
-
-FX_BOOL CPDF_Parser::LoadLinearizedAllCrossRefV5(FX_FILESIZE xrefpos) {
- if (!LoadCrossRefV5(&xrefpos, FALSE))
- return FALSE;
-
- std::set<FX_FILESIZE> seen_xrefpos;
- while (xrefpos) {
- seen_xrefpos.insert(xrefpos);
- if (!LoadCrossRefV5(&xrefpos, FALSE))
- return FALSE;
-
- // Check for circular references.
- if (pdfium::ContainsKey(seen_xrefpos, xrefpos))
- return FALSE;
- }
- m_ObjectStreamMap.clear();
- m_bXRefStream = TRUE;
- return TRUE;
-}
-
-CPDF_Parser::Error CPDF_Parser::LoadLinearizedMainXRefTable() {
- uint32_t dwSaveMetadataObjnum = m_pSyntax->m_MetadataObjnum;
- m_pSyntax->m_MetadataObjnum = 0;
- if (m_pTrailer) {
- m_pTrailer->Release();
- m_pTrailer = nullptr;
- }
-
- m_pSyntax->RestorePos(m_LastXRefOffset - m_pSyntax->m_HeaderOffset);
- uint8_t ch = 0;
- uint32_t dwCount = 0;
- m_pSyntax->GetNextChar(ch);
- while (PDFCharIsWhitespace(ch)) {
- ++dwCount;
- if (m_pSyntax->m_FileLen >=
- (FX_FILESIZE)(m_pSyntax->SavePos() + m_pSyntax->m_HeaderOffset)) {
- break;
- }
- m_pSyntax->GetNextChar(ch);
- }
- m_LastXRefOffset += dwCount;
- m_ObjectStreamMap.clear();
- m_ObjCache.clear();
-
- if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) &&
- !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
- m_LastXRefOffset = 0;
- m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
- return FORMAT_ERROR;
- }
-
- m_pSyntax->m_MetadataObjnum = dwSaveMetadataObjnum;
- return SUCCESS;
-}
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