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Unified Diff: core/fpdfapi/fpdf_parser/cpdf_syntax_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_syntax_parser.cpp
diff --git a/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp
deleted file mode 100644
index 32a75f98da9549d13827dfe534486ab646b86109..0000000000000000000000000000000000000000
--- a/core/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp
+++ /dev/null
@@ -1,997 +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_syntax_parser.h"
-
-#include <vector>
-
-#include "core/fpdfapi/cpdf_modulemgr.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_array.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_boolean.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_crypto_handler.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_name.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_null.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_number.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_reference.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_stream.h"
-#include "core/fpdfapi/fpdf_parser/cpdf_string.h"
-#include "core/fpdfapi/fpdf_parser/fpdf_parser_decode.h"
-#include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
-#include "core/fxcrt/fx_ext.h"
-#include "third_party/base/numerics/safe_math.h"
-
-namespace {
-
-struct SearchTagRecord {
- CFX_ByteStringC m_bsTag;
- FX_STRSIZE m_Offset;
-};
-
-} // namespace
-
-// static
-int CPDF_SyntaxParser::s_CurrentRecursionDepth = 0;
-
-CPDF_SyntaxParser::CPDF_SyntaxParser()
- : CPDF_SyntaxParser(CFX_WeakPtr<CFX_ByteStringPool>()) {}
-
-CPDF_SyntaxParser::CPDF_SyntaxParser(
- const CFX_WeakPtr<CFX_ByteStringPool>& pPool)
- : m_MetadataObjnum(0),
- m_pFileAccess(nullptr),
- m_pFileBuf(nullptr),
- m_BufSize(CPDF_ModuleMgr::kFileBufSize),
- m_pPool(pPool) {}
-
-CPDF_SyntaxParser::~CPDF_SyntaxParser() {
- FX_Free(m_pFileBuf);
-}
-
-FX_BOOL CPDF_SyntaxParser::GetCharAt(FX_FILESIZE pos, uint8_t& ch) {
- CFX_AutoRestorer<FX_FILESIZE> save_pos(&m_Pos);
- m_Pos = pos;
- return GetNextChar(ch);
-}
-
-FX_BOOL CPDF_SyntaxParser::GetNextChar(uint8_t& ch) {
- FX_FILESIZE pos = m_Pos + m_HeaderOffset;
- if (pos >= m_FileLen)
- return FALSE;
-
- if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
- FX_FILESIZE read_pos = pos;
- uint32_t read_size = m_BufSize;
- if ((FX_FILESIZE)read_size > m_FileLen)
- read_size = (uint32_t)m_FileLen;
-
- if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
- if (m_FileLen < (FX_FILESIZE)read_size) {
- read_pos = 0;
- read_size = (uint32_t)m_FileLen;
- } else {
- read_pos = m_FileLen - read_size;
- }
- }
-
- if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size))
- return FALSE;
-
- m_BufOffset = read_pos;
- }
- ch = m_pFileBuf[pos - m_BufOffset];
- m_Pos++;
- return TRUE;
-}
-
-FX_BOOL CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch) {
- pos += m_HeaderOffset;
- if (pos >= m_FileLen)
- return FALSE;
-
- if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) {
- FX_FILESIZE read_pos;
- if (pos < (FX_FILESIZE)m_BufSize)
- read_pos = 0;
- else
- read_pos = pos - m_BufSize + 1;
-
- uint32_t read_size = m_BufSize;
- if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) {
- if (m_FileLen < (FX_FILESIZE)read_size) {
- read_pos = 0;
- read_size = (uint32_t)m_FileLen;
- } else {
- read_pos = m_FileLen - read_size;
- }
- }
-
- if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size))
- return FALSE;
-
- m_BufOffset = read_pos;
- }
- ch = m_pFileBuf[pos - m_BufOffset];
- return TRUE;
-}
-
-FX_BOOL CPDF_SyntaxParser::ReadBlock(uint8_t* pBuf, uint32_t size) {
- if (!m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size))
- return FALSE;
- m_Pos += size;
- return TRUE;
-}
-
-void CPDF_SyntaxParser::GetNextWordInternal(bool* bIsNumber) {
- m_WordSize = 0;
- if (bIsNumber)
- *bIsNumber = true;
-
- uint8_t ch;
- if (!GetNextChar(ch))
- return;
-
- while (1) {
- while (PDFCharIsWhitespace(ch)) {
- if (!GetNextChar(ch))
- return;
- }
-
- if (ch != '%')
- break;
-
- while (1) {
- if (!GetNextChar(ch))
- return;
- if (PDFCharIsLineEnding(ch))
- break;
- }
- }
-
- if (PDFCharIsDelimiter(ch)) {
- if (bIsNumber)
- *bIsNumber = false;
-
- m_WordBuffer[m_WordSize++] = ch;
- if (ch == '/') {
- while (1) {
- if (!GetNextChar(ch))
- return;
-
- if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) {
- m_Pos--;
- return;
- }
-
- if (m_WordSize < sizeof(m_WordBuffer) - 1)
- m_WordBuffer[m_WordSize++] = ch;
- }
- } else if (ch == '<') {
- if (!GetNextChar(ch))
- return;
-
- if (ch == '<')
- m_WordBuffer[m_WordSize++] = ch;
- else
- m_Pos--;
- } else if (ch == '>') {
- if (!GetNextChar(ch))
- return;
-
- if (ch == '>')
- m_WordBuffer[m_WordSize++] = ch;
- else
- m_Pos--;
- }
- return;
- }
-
- while (1) {
- if (m_WordSize < sizeof(m_WordBuffer) - 1)
- m_WordBuffer[m_WordSize++] = ch;
-
- if (!PDFCharIsNumeric(ch)) {
- if (bIsNumber)
- *bIsNumber = false;
- }
-
- if (!GetNextChar(ch))
- return;
-
- if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) {
- m_Pos--;
- break;
- }
- }
-}
-
-CFX_ByteString CPDF_SyntaxParser::ReadString() {
- uint8_t ch;
- if (!GetNextChar(ch))
- return CFX_ByteString();
-
- CFX_ByteTextBuf buf;
- int32_t parlevel = 0;
- int32_t status = 0;
- int32_t iEscCode = 0;
- while (1) {
- switch (status) {
- case 0:
- if (ch == ')') {
- if (parlevel == 0) {
- return buf.MakeString();
- }
- parlevel--;
- buf.AppendChar(')');
- } else if (ch == '(') {
- parlevel++;
- buf.AppendChar('(');
- } else if (ch == '\\') {
- status = 1;
- } else {
- buf.AppendChar(ch);
- }
- break;
- case 1:
- if (ch >= '0' && ch <= '7') {
- iEscCode = FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
- status = 2;
- break;
- }
-
- if (ch == 'n') {
- buf.AppendChar('\n');
- } else if (ch == 'r') {
- buf.AppendChar('\r');
- } else if (ch == 't') {
- buf.AppendChar('\t');
- } else if (ch == 'b') {
- buf.AppendChar('\b');
- } else if (ch == 'f') {
- buf.AppendChar('\f');
- } else if (ch == '\r') {
- status = 4;
- break;
- } else if (ch != '\n') {
- buf.AppendChar(ch);
- }
- status = 0;
- break;
- case 2:
- if (ch >= '0' && ch <= '7') {
- iEscCode =
- iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
- status = 3;
- } else {
- buf.AppendChar(iEscCode);
- status = 0;
- continue;
- }
- break;
- case 3:
- if (ch >= '0' && ch <= '7') {
- iEscCode =
- iEscCode * 8 + FXSYS_toDecimalDigit(static_cast<FX_WCHAR>(ch));
- buf.AppendChar(iEscCode);
- status = 0;
- } else {
- buf.AppendChar(iEscCode);
- status = 0;
- continue;
- }
- break;
- case 4:
- status = 0;
- if (ch != '\n')
- continue;
- break;
- }
-
- if (!GetNextChar(ch))
- break;
- }
-
- GetNextChar(ch);
- return buf.MakeString();
-}
-
-CFX_ByteString CPDF_SyntaxParser::ReadHexString() {
- uint8_t ch;
- if (!GetNextChar(ch))
- return CFX_ByteString();
-
- CFX_ByteTextBuf buf;
- bool bFirst = true;
- uint8_t code = 0;
- while (1) {
- if (ch == '>')
- break;
-
- if (std::isxdigit(ch)) {
- int val = FXSYS_toHexDigit(ch);
- if (bFirst) {
- code = val * 16;
- } else {
- code += val;
- buf.AppendByte(code);
- }
- bFirst = !bFirst;
- }
-
- if (!GetNextChar(ch))
- break;
- }
- if (!bFirst)
- buf.AppendByte(code);
-
- return buf.MakeString();
-}
-
-void CPDF_SyntaxParser::ToNextLine() {
- uint8_t ch;
- while (GetNextChar(ch)) {
- if (ch == '\n')
- break;
-
- if (ch == '\r') {
- GetNextChar(ch);
- if (ch != '\n')
- --m_Pos;
- break;
- }
- }
-}
-
-void CPDF_SyntaxParser::ToNextWord() {
- uint8_t ch;
- if (!GetNextChar(ch))
- return;
-
- while (1) {
- while (PDFCharIsWhitespace(ch)) {
- if (!GetNextChar(ch))
- return;
- }
-
- if (ch != '%')
- break;
-
- while (1) {
- if (!GetNextChar(ch))
- return;
- if (PDFCharIsLineEnding(ch))
- break;
- }
- }
- m_Pos--;
-}
-
-CFX_ByteString CPDF_SyntaxParser::GetNextWord(bool* bIsNumber) {
- GetNextWordInternal(bIsNumber);
- return CFX_ByteString((const FX_CHAR*)m_WordBuffer, m_WordSize);
-}
-
-CFX_ByteString CPDF_SyntaxParser::GetKeyword() {
- return GetNextWord(nullptr);
-}
-
-CPDF_Object* CPDF_SyntaxParser::GetObject(CPDF_IndirectObjectHolder* pObjList,
- uint32_t objnum,
- uint32_t gennum,
- FX_BOOL bDecrypt) {
- CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
- if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth)
- return nullptr;
-
- FX_FILESIZE SavedObjPos = m_Pos;
- bool bIsNumber;
- CFX_ByteString word = GetNextWord(&bIsNumber);
- if (word.GetLength() == 0)
- return nullptr;
-
- if (bIsNumber) {
- FX_FILESIZE SavedPos = m_Pos;
- CFX_ByteString nextword = GetNextWord(&bIsNumber);
- if (bIsNumber) {
- CFX_ByteString nextword2 = GetNextWord(nullptr);
- if (nextword2 == "R")
- return new CPDF_Reference(pObjList, FXSYS_atoui(word.c_str()));
- }
- m_Pos = SavedPos;
- return new CPDF_Number(word.AsStringC());
- }
-
- if (word == "true" || word == "false")
- return new CPDF_Boolean(word == "true");
-
- if (word == "null")
- return new CPDF_Null;
-
- if (word == "(") {
- CFX_ByteString str = ReadString();
- if (m_pCryptoHandler && bDecrypt)
- m_pCryptoHandler->Decrypt(objnum, gennum, str);
- return new CPDF_String(MaybeIntern(str), FALSE);
- }
-
- if (word == "<") {
- CFX_ByteString str = ReadHexString();
- if (m_pCryptoHandler && bDecrypt)
- m_pCryptoHandler->Decrypt(objnum, gennum, str);
- return new CPDF_String(MaybeIntern(str), TRUE);
- }
-
- if (word == "[") {
- CPDF_Array* pArray = new CPDF_Array;
- while (CPDF_Object* pObj = GetObject(pObjList, objnum, gennum, true))
- pArray->Add(pObj);
-
- return pArray;
- }
-
- if (word[0] == '/') {
- return new CPDF_Name(MaybeIntern(
- PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1))));
- }
-
- if (word == "<<") {
- int32_t nKeys = 0;
- FX_FILESIZE dwSignValuePos = 0;
-
- std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>> pDict(
- new CPDF_Dictionary(m_pPool));
- while (1) {
- CFX_ByteString key = GetNextWord(nullptr);
- if (key.IsEmpty())
- return nullptr;
-
- FX_FILESIZE SavedPos = m_Pos - key.GetLength();
- if (key == ">>")
- break;
-
- if (key == "endobj") {
- m_Pos = SavedPos;
- break;
- }
-
- if (key[0] != '/')
- continue;
-
- ++nKeys;
- key = PDF_NameDecode(key);
- if (key.IsEmpty())
- continue;
-
- if (key == "/Contents")
- dwSignValuePos = m_Pos;
-
- CPDF_Object* pObj = GetObject(pObjList, objnum, gennum, true);
- if (!pObj)
- continue;
-
- CFX_ByteString keyNoSlash(key.raw_str() + 1, key.GetLength() - 1);
- pDict->SetFor(keyNoSlash, pObj);
- }
-
- // Only when this is a signature dictionary and has contents, we reset the
- // contents to the un-decrypted form.
- if (pDict->IsSignatureDict() && dwSignValuePos) {
- CFX_AutoRestorer<FX_FILESIZE> save_pos(&m_Pos);
- m_Pos = dwSignValuePos;
- pDict->SetFor("Contents", GetObject(pObjList, objnum, gennum, false));
- }
-
- FX_FILESIZE SavedPos = m_Pos;
- CFX_ByteString nextword = GetNextWord(nullptr);
- if (nextword != "stream") {
- m_Pos = SavedPos;
- return pDict.release();
- }
- return ReadStream(pDict.release(), objnum, gennum);
- }
-
- if (word == ">>")
- m_Pos = SavedObjPos;
-
- return nullptr;
-}
-
-CPDF_Object* CPDF_SyntaxParser::GetObjectForStrict(
- CPDF_IndirectObjectHolder* pObjList,
- uint32_t objnum,
- uint32_t gennum) {
- CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth);
- if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth)
- return nullptr;
-
- FX_FILESIZE SavedObjPos = m_Pos;
- bool bIsNumber;
- CFX_ByteString word = GetNextWord(&bIsNumber);
- if (word.GetLength() == 0)
- return nullptr;
-
- if (bIsNumber) {
- FX_FILESIZE SavedPos = m_Pos;
- CFX_ByteString nextword = GetNextWord(&bIsNumber);
- if (bIsNumber) {
- CFX_ByteString nextword2 = GetNextWord(nullptr);
- if (nextword2 == "R")
- return new CPDF_Reference(pObjList, FXSYS_atoui(word.c_str()));
- }
- m_Pos = SavedPos;
- return new CPDF_Number(word.AsStringC());
- }
-
- if (word == "true" || word == "false")
- return new CPDF_Boolean(word == "true");
-
- if (word == "null")
- return new CPDF_Null;
-
- if (word == "(") {
- CFX_ByteString str = ReadString();
- if (m_pCryptoHandler)
- m_pCryptoHandler->Decrypt(objnum, gennum, str);
- return new CPDF_String(MaybeIntern(str), FALSE);
- }
-
- if (word == "<") {
- CFX_ByteString str = ReadHexString();
- if (m_pCryptoHandler)
- m_pCryptoHandler->Decrypt(objnum, gennum, str);
- return new CPDF_String(MaybeIntern(str), TRUE);
- }
-
- if (word == "[") {
- std::unique_ptr<CPDF_Array, ReleaseDeleter<CPDF_Array>> pArray(
- new CPDF_Array);
- while (CPDF_Object* pObj = GetObject(pObjList, objnum, gennum, true))
- pArray->Add(pObj);
-
- return m_WordBuffer[0] == ']' ? pArray.release() : nullptr;
- }
-
- if (word[0] == '/') {
- return new CPDF_Name(MaybeIntern(
- PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1))));
- }
-
- if (word == "<<") {
- std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>> pDict(
- new CPDF_Dictionary(m_pPool));
- while (1) {
- FX_FILESIZE SavedPos = m_Pos;
- CFX_ByteString key = GetNextWord(nullptr);
- if (key.IsEmpty())
- return nullptr;
-
- if (key == ">>")
- break;
-
- if (key == "endobj") {
- m_Pos = SavedPos;
- break;
- }
-
- if (key[0] != '/')
- continue;
-
- key = PDF_NameDecode(key);
- std::unique_ptr<CPDF_Object, ReleaseDeleter<CPDF_Object>> obj(
- GetObject(pObjList, objnum, gennum, true));
- if (!obj) {
- uint8_t ch;
- while (GetNextChar(ch) && ch != 0x0A && ch != 0x0D) {
- continue;
- }
- return nullptr;
- }
-
- if (key.GetLength() > 1) {
- pDict->SetFor(CFX_ByteString(key.c_str() + 1, key.GetLength() - 1),
- obj.release());
- }
- }
-
- FX_FILESIZE SavedPos = m_Pos;
- CFX_ByteString nextword = GetNextWord(nullptr);
- if (nextword != "stream") {
- m_Pos = SavedPos;
- return pDict.release();
- }
-
- return ReadStream(pDict.release(), objnum, gennum);
- }
-
- if (word == ">>")
- m_Pos = SavedObjPos;
-
- return nullptr;
-}
-
-unsigned int CPDF_SyntaxParser::ReadEOLMarkers(FX_FILESIZE pos) {
- unsigned char byte1 = 0;
- unsigned char byte2 = 0;
-
- GetCharAt(pos, byte1);
- GetCharAt(pos + 1, byte2);
-
- if (byte1 == '\r' && byte2 == '\n')
- return 2;
-
- if (byte1 == '\r' || byte1 == '\n')
- return 1;
-
- return 0;
-}
-
-CPDF_Stream* CPDF_SyntaxParser::ReadStream(CPDF_Dictionary* pDict,
- uint32_t objnum,
- uint32_t gennum) {
- CPDF_Object* pLenObj = pDict->GetObjectFor("Length");
- FX_FILESIZE len = -1;
- CPDF_Reference* pLenObjRef = ToReference(pLenObj);
-
- bool differingObjNum = !pLenObjRef || (pLenObjRef->GetObjList() &&
- pLenObjRef->GetRefObjNum() != objnum);
- if (pLenObj && differingObjNum)
- len = pLenObj->GetInteger();
-
- // Locate the start of stream.
- ToNextLine();
- FX_FILESIZE streamStartPos = m_Pos;
-
- const CFX_ByteStringC kEndStreamStr("endstream");
- const CFX_ByteStringC kEndObjStr("endobj");
-
- CPDF_CryptoHandler* pCryptoHandler =
- objnum == (uint32_t)m_MetadataObjnum ? nullptr : m_pCryptoHandler.get();
- if (!pCryptoHandler) {
- FX_BOOL bSearchForKeyword = TRUE;
- if (len >= 0) {
- pdfium::base::CheckedNumeric<FX_FILESIZE> pos = m_Pos;
- pos += len;
- if (pos.IsValid() && pos.ValueOrDie() < m_FileLen)
- m_Pos = pos.ValueOrDie();
-
- m_Pos += ReadEOLMarkers(m_Pos);
- FXSYS_memset(m_WordBuffer, 0, kEndStreamStr.GetLength() + 1);
- GetNextWordInternal(nullptr);
- // Earlier version of PDF specification doesn't require EOL marker before
- // 'endstream' keyword. If keyword 'endstream' follows the bytes in
- // specified length, it signals the end of stream.
- if (FXSYS_memcmp(m_WordBuffer, kEndStreamStr.raw_str(),
- kEndStreamStr.GetLength()) == 0) {
- bSearchForKeyword = FALSE;
- }
- }
-
- if (bSearchForKeyword) {
- // If len is not available, len needs to be calculated
- // by searching the keywords "endstream" or "endobj".
- m_Pos = streamStartPos;
- FX_FILESIZE endStreamOffset = 0;
- while (endStreamOffset >= 0) {
- endStreamOffset = FindTag(kEndStreamStr, 0);
-
- // Can't find "endstream".
- if (endStreamOffset < 0)
- break;
-
- // Stop searching when "endstream" is found.
- if (IsWholeWord(m_Pos - kEndStreamStr.GetLength(), m_FileLen,
- kEndStreamStr, TRUE)) {
- endStreamOffset = m_Pos - streamStartPos - kEndStreamStr.GetLength();
- break;
- }
- }
-
- m_Pos = streamStartPos;
- FX_FILESIZE endObjOffset = 0;
- while (endObjOffset >= 0) {
- endObjOffset = FindTag(kEndObjStr, 0);
-
- // Can't find "endobj".
- if (endObjOffset < 0)
- break;
-
- // Stop searching when "endobj" is found.
- if (IsWholeWord(m_Pos - kEndObjStr.GetLength(), m_FileLen, kEndObjStr,
- TRUE)) {
- endObjOffset = m_Pos - streamStartPos - kEndObjStr.GetLength();
- break;
- }
- }
-
- // Can't find "endstream" or "endobj".
- if (endStreamOffset < 0 && endObjOffset < 0) {
- pDict->Release();
- return nullptr;
- }
-
- if (endStreamOffset < 0 && endObjOffset >= 0) {
- // Correct the position of end stream.
- endStreamOffset = endObjOffset;
- } else if (endStreamOffset >= 0 && endObjOffset < 0) {
- // Correct the position of end obj.
- endObjOffset = endStreamOffset;
- } else if (endStreamOffset > endObjOffset) {
- endStreamOffset = endObjOffset;
- }
-
- len = endStreamOffset;
- int numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 2);
- if (numMarkers == 2) {
- len -= 2;
- } else {
- numMarkers = ReadEOLMarkers(streamStartPos + endStreamOffset - 1);
- if (numMarkers == 1) {
- len -= 1;
- }
- }
-
- if (len < 0) {
- pDict->Release();
- return nullptr;
- }
- pDict->SetIntegerFor("Length", len);
- }
- m_Pos = streamStartPos;
- }
-
- if (len < 0) {
- pDict->Release();
- return nullptr;
- }
-
- uint8_t* pData = nullptr;
- if (len > 0) {
- pData = FX_Alloc(uint8_t, len);
- ReadBlock(pData, len);
- if (pCryptoHandler) {
- CFX_BinaryBuf dest_buf;
- dest_buf.EstimateSize(pCryptoHandler->DecryptGetSize(len));
-
- void* context = pCryptoHandler->DecryptStart(objnum, gennum);
- pCryptoHandler->DecryptStream(context, pData, len, dest_buf);
- pCryptoHandler->DecryptFinish(context, dest_buf);
-
- FX_Free(pData);
- pData = dest_buf.GetBuffer();
- len = dest_buf.GetSize();
- dest_buf.DetachBuffer();
- }
- }
-
- CPDF_Stream* pStream = new CPDF_Stream(pData, len, pDict);
- streamStartPos = m_Pos;
- FXSYS_memset(m_WordBuffer, 0, kEndObjStr.GetLength() + 1);
-
- GetNextWordInternal(nullptr);
-
- int numMarkers = ReadEOLMarkers(m_Pos);
- if (m_WordSize == static_cast<unsigned int>(kEndObjStr.GetLength()) &&
- numMarkers != 0 &&
- FXSYS_memcmp(m_WordBuffer, kEndObjStr.raw_str(),
- kEndObjStr.GetLength()) == 0) {
- m_Pos = streamStartPos;
- }
- return pStream;
-}
-
-void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess,
- uint32_t HeaderOffset) {
- FX_Free(m_pFileBuf);
-
- m_pFileBuf = FX_Alloc(uint8_t, m_BufSize);
- m_HeaderOffset = HeaderOffset;
- m_FileLen = pFileAccess->GetSize();
- m_Pos = 0;
- m_pFileAccess = pFileAccess;
- m_BufOffset = 0;
- pFileAccess->ReadBlock(
- m_pFileBuf, 0,
- (size_t)((FX_FILESIZE)m_BufSize > m_FileLen ? m_FileLen : m_BufSize));
-}
-
-uint32_t CPDF_SyntaxParser::GetDirectNum() {
- bool bIsNumber;
- GetNextWordInternal(&bIsNumber);
- if (!bIsNumber)
- return 0;
-
- m_WordBuffer[m_WordSize] = 0;
- return FXSYS_atoui(reinterpret_cast<const FX_CHAR*>(m_WordBuffer));
-}
-
-bool CPDF_SyntaxParser::IsWholeWord(FX_FILESIZE startpos,
- FX_FILESIZE limit,
- const CFX_ByteStringC& tag,
- FX_BOOL checkKeyword) {
- const uint32_t taglen = tag.GetLength();
-
- bool bCheckLeft = !PDFCharIsDelimiter(tag[0]) && !PDFCharIsWhitespace(tag[0]);
- bool bCheckRight = !PDFCharIsDelimiter(tag[taglen - 1]) &&
- !PDFCharIsWhitespace(tag[taglen - 1]);
-
- uint8_t ch;
- if (bCheckRight && startpos + (int32_t)taglen <= limit &&
- GetCharAt(startpos + (int32_t)taglen, ch)) {
- if (PDFCharIsNumeric(ch) || PDFCharIsOther(ch) ||
- (checkKeyword && PDFCharIsDelimiter(ch))) {
- return false;
- }
- }
-
- if (bCheckLeft && startpos > 0 && GetCharAt(startpos - 1, ch)) {
- if (PDFCharIsNumeric(ch) || PDFCharIsOther(ch) ||
- (checkKeyword && PDFCharIsDelimiter(ch))) {
- return false;
- }
- }
- return true;
-}
-
-// TODO(dsinclair): Split into a SearchWordForward and SearchWordBackwards
-// and drop the bool.
-FX_BOOL CPDF_SyntaxParser::SearchWord(const CFX_ByteStringC& tag,
- FX_BOOL bWholeWord,
- FX_BOOL bForward,
- FX_FILESIZE limit) {
- int32_t taglen = tag.GetLength();
- if (taglen == 0)
- return FALSE;
-
- FX_FILESIZE pos = m_Pos;
- int32_t offset = 0;
- if (!bForward)
- offset = taglen - 1;
-
- const uint8_t* tag_data = tag.raw_str();
- uint8_t byte;
- while (1) {
- if (bForward) {
- if (limit && pos >= m_Pos + limit)
- return FALSE;
-
- if (!GetCharAt(pos, byte))
- return FALSE;
-
- } else {
- if (limit && pos <= m_Pos - limit)
- return FALSE;
-
- if (!GetCharAtBackward(pos, byte))
- return FALSE;
- }
-
- if (byte == tag_data[offset]) {
- if (bForward) {
- offset++;
- if (offset < taglen) {
- pos++;
- continue;
- }
- } else {
- offset--;
- if (offset >= 0) {
- pos--;
- continue;
- }
- }
-
- FX_FILESIZE startpos = bForward ? pos - taglen + 1 : pos;
- if (!bWholeWord || IsWholeWord(startpos, limit, tag, FALSE)) {
- m_Pos = startpos;
- return TRUE;
- }
- }
-
- if (bForward) {
- offset = byte == tag_data[0] ? 1 : 0;
- pos++;
- } else {
- offset = byte == tag_data[taglen - 1] ? taglen - 2 : taglen - 1;
- pos--;
- }
-
- if (pos < 0)
- return FALSE;
- }
-
- return FALSE;
-}
-
-int32_t CPDF_SyntaxParser::SearchMultiWord(const CFX_ByteStringC& tags,
- FX_BOOL bWholeWord,
- FX_FILESIZE limit) {
- int32_t ntags = 1;
- for (int i = 0; i < tags.GetLength(); ++i) {
- if (tags[i] == 0)
- ++ntags;
- }
-
- // Ensure that the input byte string happens to be nul-terminated. This
- // need not be the case, but the loop below uses this guarantee to put
- // the last pattern into the vector.
- ASSERT(tags[tags.GetLength()] == 0);
- std::vector<SearchTagRecord> patterns(ntags);
- uint32_t start = 0;
- uint32_t itag = 0;
- uint32_t max_len = 0;
- for (int i = 0; i <= tags.GetLength(); ++i) {
- if (tags[i] == 0) {
- uint32_t len = i - start;
- max_len = std::max(len, max_len);
- patterns[itag].m_bsTag = tags.Mid(start, len);
- patterns[itag].m_Offset = 0;
- start = i + 1;
- ++itag;
- }
- }
-
- const FX_FILESIZE pos_limit = m_Pos + limit;
- for (FX_FILESIZE pos = m_Pos; !limit || pos < pos_limit; ++pos) {
- uint8_t byte;
- if (!GetCharAt(pos, byte))
- break;
-
- for (int i = 0; i < ntags; ++i) {
- SearchTagRecord& pat = patterns[i];
- if (pat.m_bsTag[pat.m_Offset] != byte) {
- pat.m_Offset = (pat.m_bsTag[0] == byte) ? 1 : 0;
- continue;
- }
-
- ++pat.m_Offset;
- if (pat.m_Offset != pat.m_bsTag.GetLength())
- continue;
-
- if (!bWholeWord || IsWholeWord(pos - pat.m_bsTag.GetLength(), limit,
- pat.m_bsTag, FALSE)) {
- return i;
- }
-
- pat.m_Offset = (pat.m_bsTag[0] == byte) ? 1 : 0;
- }
- }
- return -1;
-}
-
-FX_FILESIZE CPDF_SyntaxParser::FindTag(const CFX_ByteStringC& tag,
- FX_FILESIZE limit) {
- int32_t taglen = tag.GetLength();
- int32_t match = 0;
- limit += m_Pos;
- FX_FILESIZE startpos = m_Pos;
-
- while (1) {
- uint8_t ch;
- if (!GetNextChar(ch))
- return -1;
-
- if (ch == tag[match]) {
- match++;
- if (match == taglen)
- return m_Pos - startpos - taglen;
- } else {
- match = ch == tag[0] ? 1 : 0;
- }
-
- if (limit && m_Pos == limit)
- return -1;
- }
- return -1;
-}
-
-void CPDF_SyntaxParser::SetEncrypt(
- std::unique_ptr<CPDF_CryptoHandler> pCryptoHandler) {
- m_pCryptoHandler = std::move(pCryptoHandler);
-}
-
-CFX_ByteString CPDF_SyntaxParser::MaybeIntern(const CFX_ByteString& str) {
- return m_pPool ? m_pPool->Intern(str) : str;
-}
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