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author | dsinclair <dsinclair@chromium.org> | 2016-10-04 11:55:50 -0700 |
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committer | Commit bot <commit-bot@chromium.org> | 2016-10-04 11:55:51 -0700 |
commit | 488b7ad845d6de212d89cd957303b294ecfa5922 (patch) | |
tree | adfdd2327724bd3597a1a7614bbe29a01a0c8dc0 /core/fpdfapi/fpdf_parser/cpdf_parser.cpp | |
parent | 41872fa5ac7448a50f66ad56d7bde8d1aa77db4b (diff) | |
download | pdfium-488b7ad845d6de212d89cd957303b294ecfa5922.tar.xz |
Move core/fpdfapi/fpdf_parser to core/fpdfapi/parser
BUG=pdfium:603
Review-Url: https://codereview.chromium.org/2392603004
Diffstat (limited to 'core/fpdfapi/fpdf_parser/cpdf_parser.cpp')
-rw-r--r-- | core/fpdfapi/fpdf_parser/cpdf_parser.cpp | 1637 |
1 files changed, 0 insertions, 1637 deletions
diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp deleted file mode 100644 index 182d3869bc..0000000000 --- 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; -} |