diff options
Diffstat (limited to 'core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp')
-rw-r--r-- | core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp | 976 |
1 files changed, 0 insertions, 976 deletions
diff --git a/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp b/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp deleted file mode 100644 index 26bc9a49cd..0000000000 --- a/core/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.cpp +++ /dev/null @@ -1,976 +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/src/fpdfapi/fpdf_parser/cpdf_syntax_parser.h" - -#include "core/include/fpdfapi/fpdf_module.h" -#include "core/include/fpdfapi/fpdf_parser.h" -#include "core/include/fxcrt/fx_ext.h" -#include "third_party/base/numerics/safe_math.h" - -namespace { - -struct SearchTagRecord { - const char* m_pTag; - FX_DWORD m_Len; - FX_DWORD m_Offset; -}; - -} // namespace - -// static -int CPDF_SyntaxParser::s_CurrentRecursionDepth = 0; - -CPDF_SyntaxParser::CPDF_SyntaxParser() - : m_MetadataObjnum(0), - m_pFileAccess(nullptr), - m_pFileBuf(nullptr), - m_BufSize(CPDF_ModuleMgr::kFileBufSize) {} - -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; - FX_DWORD read_size = m_BufSize; - if ((FX_FILESIZE)read_size > m_FileLen) - read_size = (FX_DWORD)m_FileLen; - - if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) { - if (m_FileLen < (FX_FILESIZE)read_size) { - read_pos = 0; - read_size = (FX_DWORD)m_FileLen; - } else { - read_pos = m_FileLen - read_size; - } - } - - if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) - return FALSE; - - m_BufOffset = read_pos; - } - ch = m_pFileBuf[pos - m_BufOffset]; - m_Pos++; - return TRUE; -} - -FX_BOOL CPDF_SyntaxParser::GetCharAtBackward(FX_FILESIZE pos, uint8_t& ch) { - pos += m_HeaderOffset; - if (pos >= m_FileLen) - return FALSE; - - if (m_BufOffset >= pos || (FX_FILESIZE)(m_BufOffset + m_BufSize) <= pos) { - FX_FILESIZE read_pos; - if (pos < (FX_FILESIZE)m_BufSize) - read_pos = 0; - else - read_pos = pos - m_BufSize + 1; - - FX_DWORD read_size = m_BufSize; - if ((FX_FILESIZE)(read_pos + read_size) > m_FileLen) { - if (m_FileLen < (FX_FILESIZE)read_size) { - read_pos = 0; - read_size = (FX_DWORD)m_FileLen; - } else { - read_pos = m_FileLen - read_size; - } - } - - if (!m_pFileAccess->ReadBlock(m_pFileBuf, read_pos, read_size)) - return FALSE; - - m_BufOffset = read_pos; - } - ch = m_pFileBuf[pos - m_BufOffset]; - return TRUE; -} - -FX_BOOL CPDF_SyntaxParser::ReadBlock(uint8_t* pBuf, FX_DWORD size) { - if (!m_pFileAccess->ReadBlock(pBuf, m_Pos + m_HeaderOffset, size)) - return FALSE; - m_Pos += size; - return TRUE; -} - -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.GetByteString(); - } - parlevel--; - buf.AppendChar(')'); - } else if (ch == '(') { - parlevel++; - buf.AppendChar('('); - } else if (ch == '\\') { - status = 1; - } else { - buf.AppendChar(ch); - } - break; - case 1: - if (ch >= '0' && ch <= '7') { - iEscCode = 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.GetByteString(); -} - -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.GetByteString(); -} - -void CPDF_SyntaxParser::ToNextLine() { - uint8_t ch; - while (GetNextChar(ch)) { - if (ch == '\n') - break; - - if (ch == '\r') { - GetNextChar(ch); - if (ch != '\n') - --m_Pos; - break; - } - } -} - -void CPDF_SyntaxParser::ToNextWord() { - uint8_t ch; - if (!GetNextChar(ch)) - return; - - 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, - FX_DWORD objnum, - FX_DWORD gennum, - FX_BOOL bDecrypt) { - CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth); - if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) - return nullptr; - - FX_FILESIZE SavedPos = 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") { - FX_DWORD objnum = FXSYS_atoui(word); - return new CPDF_Reference(pObjList, objnum); - } - } - m_Pos = SavedPos; - return new CPDF_Number(word); - } - - 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(str, FALSE); - } - - if (word == "<") { - CFX_ByteString str = ReadHexString(); - if (m_pCryptoHandler && bDecrypt) - m_pCryptoHandler->Decrypt(objnum, gennum, str); - - return new CPDF_String(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( - 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); - 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_ByteStringC keyNoSlash(key.c_str() + 1, key.GetLength() - 1); - pDict->SetAt(keyNoSlash, pObj); - } - - // Only when this is a signature dictionary and has contents, we reset the - // contents to the un-decrypted form. - if (IsSignatureDict(pDict.get()) && dwSignValuePos) { - CFX_AutoRestorer<FX_FILESIZE> save_pos(&m_Pos); - m_Pos = dwSignValuePos; - pDict->SetAt("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 = SavedPos; - - return nullptr; -} - -CPDF_Object* CPDF_SyntaxParser::GetObjectByStrict( - CPDF_IndirectObjectHolder* pObjList, - FX_DWORD objnum, - FX_DWORD gennum) { - CFX_AutoRestorer<int> restorer(&s_CurrentRecursionDepth); - if (++s_CurrentRecursionDepth > kParserMaxRecursionDepth) - return nullptr; - - FX_FILESIZE SavedPos = 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)); - } - m_Pos = SavedPos; - return new CPDF_Number(word); - } - - 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(str, FALSE); - } - - if (word == "<") { - CFX_ByteString str = ReadHexString(); - if (m_pCryptoHandler) - m_pCryptoHandler->Decrypt(objnum, gennum, str); - return new CPDF_String(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( - PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1))); - } - - if (word == "<<") { - std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>> pDict( - new CPDF_Dictionary); - 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->SetAt(CFX_ByteStringC(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 = SavedPos; - - 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, - FX_DWORD objnum, - FX_DWORD gennum) { - CPDF_Object* pLenObj = pDict->GetElement("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 == (FX_DWORD)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.GetPtr(), - 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->SetAtInteger("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 == kEndObjStr.GetLength() && numMarkers != 0 && - FXSYS_memcmp(m_WordBuffer, kEndObjStr.GetPtr(), kEndObjStr.GetLength()) == - 0) { - m_Pos = streamStartPos; - } - return pStream; -} - -void CPDF_SyntaxParser::InitParser(IFX_FileRead* pFileAccess, - FX_DWORD HeaderOffset) { - FX_Free(m_pFileBuf); - - m_pFileBuf = FX_Alloc(uint8_t, m_BufSize); - m_HeaderOffset = HeaderOffset; - m_FileLen = pFileAccess->GetSize(); - m_Pos = 0; - m_pFileAccess = pFileAccess; - m_BufOffset = 0; - pFileAccess->ReadBlock( - m_pFileBuf, 0, - (size_t)((FX_FILESIZE)m_BufSize > m_FileLen ? m_FileLen : m_BufSize)); -} - -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 FX_DWORD 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.GetPtr(); - 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; - } - - std::vector<SearchTagRecord> patterns(ntags); - FX_DWORD start = 0; - FX_DWORD itag = 0; - FX_DWORD max_len = 0; - for (int i = 0; i <= tags.GetLength(); ++i) { - if (tags[i] == 0) { - FX_DWORD len = i - start; - max_len = std::max(len, max_len); - patterns[itag].m_pTag = tags.GetCStr() + start; - patterns[itag].m_Len = 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_pTag[pat.m_Offset] != byte) { - pat.m_Offset = (pat.m_pTag[0] == byte) ? 1 : 0; - continue; - } - - ++pat.m_Offset; - if (pat.m_Offset != pat.m_Len) - continue; - - if (!bWholeWord || - IsWholeWord(pos - pat.m_Len, limit, - CFX_ByteStringC(pat.m_pTag, pat.m_Len), FALSE)) { - return i; - } - - pat.m_Offset = (pat.m_pTag[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); -} |