| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "core/fpdfapi/fpdf_page/pageint.h" |
| |
| #include <limits.h> |
| |
| #include "core/fpdfapi/fpdf_font/cpdf_type3char.h" |
| #include "core/fpdfapi/fpdf_page/cpdf_allstates.h" |
| #include "core/fpdfapi/fpdf_page/include/cpdf_form.h" |
| #include "core/fpdfapi/fpdf_page/include/cpdf_page.h" |
| #include "core/fpdfapi/fpdf_page/include/cpdf_pageobject.h" |
| #include "core/fpdfapi/fpdf_page/include/cpdf_path.h" |
| #include "core/fpdfapi/fpdf_parser/cpdf_boolean.h" |
| #include "core/fpdfapi/fpdf_parser/cpdf_null.h" |
| #include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_document.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_name.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_number.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h" |
| #include "core/fpdfapi/fpdf_parser/include/cpdf_string.h" |
| #include "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h" |
| #include "core/fpdfapi/include/cpdf_modulemgr.h" |
| #include "core/fxcrt/include/fx_ext.h" |
| #include "core/fxcrt/include/fx_safe_types.h" |
| #include "core/include/fxcodec/fx_codec.h" |
| |
| CPDF_StreamParser::CPDF_StreamParser(const uint8_t* pData, uint32_t dwSize) { |
| m_pBuf = pData; |
| m_Size = dwSize; |
| m_Pos = 0; |
| m_pLastObj = NULL; |
| } |
| |
| CPDF_StreamParser::~CPDF_StreamParser() { |
| if (m_pLastObj) { |
| m_pLastObj->Release(); |
| } |
| } |
| |
| uint32_t DecodeAllScanlines(ICodec_ScanlineDecoder* pDecoder, |
| uint8_t*& dest_buf, |
| uint32_t& dest_size) { |
| if (!pDecoder) { |
| return static_cast<uint32_t>(-1); |
| } |
| int ncomps = pDecoder->CountComps(); |
| int bpc = pDecoder->GetBPC(); |
| int width = pDecoder->GetWidth(); |
| int height = pDecoder->GetHeight(); |
| int pitch = (width * ncomps * bpc + 7) / 8; |
| if (height == 0 || pitch > (1 << 30) / height) { |
| delete pDecoder; |
| return static_cast<uint32_t>(-1); |
| } |
| dest_buf = FX_Alloc2D(uint8_t, pitch, height); |
| dest_size = pitch * height; // Safe since checked alloc returned. |
| for (int row = 0; row < height; row++) { |
| const uint8_t* pLine = pDecoder->GetScanline(row); |
| if (!pLine) |
| break; |
| |
| FXSYS_memcpy(dest_buf + row * pitch, pLine, pitch); |
| } |
| uint32_t srcoff = pDecoder->GetSrcOffset(); |
| delete pDecoder; |
| return srcoff; |
| } |
| |
| ICodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder( |
| const uint8_t* src_buf, |
| uint32_t src_size, |
| int width, |
| int height, |
| const CPDF_Dictionary* pParams); |
| |
| uint32_t PDF_DecodeInlineStream(const uint8_t* src_buf, |
| uint32_t limit, |
| int width, |
| int height, |
| CFX_ByteString& decoder, |
| CPDF_Dictionary* pParam, |
| uint8_t*& dest_buf, |
| uint32_t& dest_size) { |
| if (decoder == "CCITTFaxDecode" || decoder == "CCF") { |
| ICodec_ScanlineDecoder* pDecoder = |
| FPDFAPI_CreateFaxDecoder(src_buf, limit, width, height, pParam); |
| return DecodeAllScanlines(pDecoder, dest_buf, dest_size); |
| } |
| if (decoder == "ASCII85Decode" || decoder == "A85") { |
| return A85Decode(src_buf, limit, dest_buf, dest_size); |
| } |
| if (decoder == "ASCIIHexDecode" || decoder == "AHx") { |
| return HexDecode(src_buf, limit, dest_buf, dest_size); |
| } |
| if (decoder == "FlateDecode" || decoder == "Fl") { |
| return FPDFAPI_FlateOrLZWDecode(FALSE, src_buf, limit, pParam, dest_size, |
| dest_buf, dest_size); |
| } |
| if (decoder == "LZWDecode" || decoder == "LZW") { |
| return FPDFAPI_FlateOrLZWDecode(TRUE, src_buf, limit, pParam, 0, dest_buf, |
| dest_size); |
| } |
| if (decoder == "DCTDecode" || decoder == "DCT") { |
| ICodec_ScanlineDecoder* pDecoder = |
| CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder( |
| src_buf, limit, width, height, 0, |
| pParam ? pParam->GetIntegerBy("ColorTransform", 1) : 1); |
| return DecodeAllScanlines(pDecoder, dest_buf, dest_size); |
| } |
| if (decoder == "RunLengthDecode" || decoder == "RL") { |
| return RunLengthDecode(src_buf, limit, dest_buf, dest_size); |
| } |
| dest_size = 0; |
| dest_buf = 0; |
| return (uint32_t)-1; |
| } |
| |
| CPDF_Stream* CPDF_StreamParser::ReadInlineStream(CPDF_Document* pDoc, |
| CPDF_Dictionary* pDict, |
| CPDF_Object* pCSObj, |
| FX_BOOL bDecode) { |
| if (m_Pos == m_Size) |
| return nullptr; |
| |
| if (PDFCharIsWhitespace(m_pBuf[m_Pos])) |
| m_Pos++; |
| |
| CFX_ByteString Decoder; |
| CPDF_Dictionary* pParam = nullptr; |
| CPDF_Object* pFilter = pDict->GetElementValue("Filter"); |
| if (pFilter) { |
| if (CPDF_Array* pArray = pFilter->AsArray()) { |
| Decoder = pArray->GetStringAt(0); |
| CPDF_Array* pParams = pDict->GetArrayBy("DecodeParms"); |
| if (pParams) |
| pParam = pParams->GetDictAt(0); |
| } else { |
| Decoder = pFilter->GetString(); |
| pParam = pDict->GetDictBy("DecodeParms"); |
| } |
| } |
| uint32_t width = pDict->GetIntegerBy("Width"); |
| uint32_t height = pDict->GetIntegerBy("Height"); |
| uint32_t OrigSize = 0; |
| if (pCSObj) { |
| uint32_t bpc = pDict->GetIntegerBy("BitsPerComponent"); |
| uint32_t nComponents = 1; |
| CPDF_ColorSpace* pCS = pDoc->LoadColorSpace(pCSObj); |
| if (!pCS) { |
| nComponents = 3; |
| } else { |
| nComponents = pCS->CountComponents(); |
| pDoc->GetPageData()->ReleaseColorSpace(pCSObj); |
| } |
| uint32_t pitch = width; |
| if (bpc && pitch > INT_MAX / bpc) { |
| return NULL; |
| } |
| pitch *= bpc; |
| if (nComponents && pitch > INT_MAX / nComponents) { |
| return NULL; |
| } |
| pitch *= nComponents; |
| if (pitch > INT_MAX - 7) { |
| return NULL; |
| } |
| pitch += 7; |
| pitch /= 8; |
| OrigSize = pitch; |
| } else { |
| if (width > INT_MAX - 7) { |
| return NULL; |
| } |
| OrigSize = ((width + 7) / 8); |
| } |
| if (height && OrigSize > INT_MAX / height) { |
| return NULL; |
| } |
| OrigSize *= height; |
| uint8_t* pData = NULL; |
| uint32_t dwStreamSize; |
| if (Decoder.IsEmpty()) { |
| if (OrigSize > m_Size - m_Pos) { |
| OrigSize = m_Size - m_Pos; |
| } |
| pData = FX_Alloc(uint8_t, OrigSize); |
| FXSYS_memcpy(pData, m_pBuf + m_Pos, OrigSize); |
| dwStreamSize = OrigSize; |
| m_Pos += OrigSize; |
| } else { |
| uint32_t dwDestSize = OrigSize; |
| dwStreamSize = |
| PDF_DecodeInlineStream(m_pBuf + m_Pos, m_Size - m_Pos, width, height, |
| Decoder, pParam, pData, dwDestSize); |
| if ((int)dwStreamSize < 0) { |
| FX_Free(pData); |
| return NULL; |
| } |
| if (bDecode) { |
| m_Pos += dwStreamSize; |
| dwStreamSize = dwDestSize; |
| if (CPDF_Array* pArray = pFilter->AsArray()) { |
| pArray->RemoveAt(0); |
| CPDF_Array* pParams = pDict->GetArrayBy("DecodeParms"); |
| if (pParams) |
| pParams->RemoveAt(0); |
| } else { |
| pDict->RemoveAt("Filter"); |
| pDict->RemoveAt("DecodeParms"); |
| } |
| } else { |
| FX_Free(pData); |
| uint32_t dwSavePos = m_Pos; |
| m_Pos += dwStreamSize; |
| while (1) { |
| uint32_t dwPrevPos = m_Pos; |
| CPDF_StreamParser::SyntaxType type = ParseNextElement(); |
| if (type == CPDF_StreamParser::EndOfData) { |
| break; |
| } |
| if (type != CPDF_StreamParser::Keyword) { |
| dwStreamSize += m_Pos - dwPrevPos; |
| continue; |
| } |
| if (GetWordSize() == 2 && GetWordBuf()[0] == 'E' && |
| GetWordBuf()[1] == 'I') { |
| m_Pos = dwPrevPos; |
| break; |
| } |
| dwStreamSize += m_Pos - dwPrevPos; |
| } |
| m_Pos = dwSavePos; |
| pData = FX_Alloc(uint8_t, dwStreamSize); |
| FXSYS_memcpy(pData, m_pBuf + m_Pos, dwStreamSize); |
| m_Pos += dwStreamSize; |
| } |
| } |
| pDict->SetAtInteger("Length", (int)dwStreamSize); |
| return new CPDF_Stream(pData, dwStreamSize, pDict); |
| } |
| |
| #define MAX_WORD_BUFFER 256 |
| #define MAX_STRING_LENGTH 32767 |
| |
| CPDF_StreamParser::SyntaxType CPDF_StreamParser::ParseNextElement() { |
| if (m_pLastObj) { |
| m_pLastObj->Release(); |
| m_pLastObj = nullptr; |
| } |
| |
| m_WordSize = 0; |
| FX_BOOL bIsNumber = TRUE; |
| if (!PositionIsInBounds()) |
| return EndOfData; |
| |
| int ch = m_pBuf[m_Pos++]; |
| while (1) { |
| while (PDFCharIsWhitespace(ch)) { |
| if (!PositionIsInBounds()) |
| return EndOfData; |
| |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| if (ch != '%') |
| break; |
| |
| while (1) { |
| if (!PositionIsInBounds()) |
| return EndOfData; |
| |
| ch = m_pBuf[m_Pos++]; |
| if (PDFCharIsLineEnding(ch)) |
| break; |
| } |
| } |
| |
| if (PDFCharIsDelimiter(ch) && ch != '/') { |
| m_Pos--; |
| m_pLastObj = ReadNextObject(); |
| return Others; |
| } |
| |
| while (1) { |
| if (m_WordSize < MAX_WORD_BUFFER) |
| m_WordBuffer[m_WordSize++] = ch; |
| |
| if (!PDFCharIsNumeric(ch)) |
| bIsNumber = FALSE; |
| |
| if (!PositionIsInBounds()) |
| break; |
| |
| ch = m_pBuf[m_Pos++]; |
| |
| if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) { |
| m_Pos--; |
| break; |
| } |
| } |
| |
| m_WordBuffer[m_WordSize] = 0; |
| if (bIsNumber) |
| return Number; |
| |
| if (m_WordBuffer[0] == '/') |
| return Name; |
| |
| if (m_WordSize == 4) { |
| if (memcmp(m_WordBuffer, "true", 4) == 0) { |
| m_pLastObj = new CPDF_Boolean(TRUE); |
| return Others; |
| } |
| if (memcmp(m_WordBuffer, "null", 4) == 0) { |
| m_pLastObj = new CPDF_Null; |
| return Others; |
| } |
| } else if (m_WordSize == 5) { |
| if (memcmp(m_WordBuffer, "false", 5) == 0) { |
| m_pLastObj = new CPDF_Boolean(FALSE); |
| return Others; |
| } |
| } |
| return Keyword; |
| } |
| |
| void CPDF_StreamParser::SkipPathObject() { |
| uint32_t command_startpos = m_Pos; |
| if (!PositionIsInBounds()) |
| return; |
| |
| int ch = m_pBuf[m_Pos++]; |
| while (1) { |
| while (PDFCharIsWhitespace(ch)) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| if (!PDFCharIsNumeric(ch)) { |
| m_Pos = command_startpos; |
| return; |
| } |
| |
| while (1) { |
| while (!PDFCharIsWhitespace(ch)) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| while (PDFCharIsWhitespace(ch)) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| if (PDFCharIsNumeric(ch)) |
| continue; |
| |
| uint32_t op_startpos = m_Pos - 1; |
| while (!PDFCharIsWhitespace(ch) && !PDFCharIsDelimiter(ch)) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| if (IsPathOperator(&m_pBuf[op_startpos], m_Pos - 1 - op_startpos)) { |
| command_startpos = m_Pos; |
| break; |
| } |
| m_Pos = command_startpos; |
| return; |
| } |
| } |
| } |
| |
| CPDF_Object* CPDF_StreamParser::ReadNextObject(FX_BOOL bAllowNestedArray, |
| FX_BOOL bInArray) { |
| FX_BOOL bIsNumber; |
| GetNextWord(bIsNumber); |
| if (m_WordSize == 0) { |
| return NULL; |
| } |
| if (bIsNumber) { |
| m_WordBuffer[m_WordSize] = 0; |
| return new CPDF_Number(CFX_ByteStringC(m_WordBuffer, m_WordSize)); |
| } |
| int first_char = m_WordBuffer[0]; |
| if (first_char == '/') { |
| return new CPDF_Name( |
| PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1))); |
| } |
| if (first_char == '(') { |
| return new CPDF_String(ReadString(), FALSE); |
| } |
| if (first_char == '<') { |
| if (m_WordSize == 1) { |
| return new CPDF_String(ReadHexString(), TRUE); |
| } |
| CPDF_Dictionary* pDict = new CPDF_Dictionary; |
| while (1) { |
| GetNextWord(bIsNumber); |
| if (m_WordSize == 0) { |
| pDict->Release(); |
| return nullptr; |
| } |
| if (m_WordSize == 2 && m_WordBuffer[0] == '>') { |
| break; |
| } |
| if (m_WordBuffer[0] != '/') { |
| pDict->Release(); |
| return nullptr; |
| } |
| CFX_ByteString key = |
| PDF_NameDecode(CFX_ByteStringC(m_WordBuffer + 1, m_WordSize - 1)); |
| CPDF_Object* pObj = ReadNextObject(TRUE); |
| if (!pObj) { |
| pDict->Release(); |
| return nullptr; |
| } |
| if (!key.IsEmpty()) { |
| pDict->SetAt(key, pObj); |
| } else { |
| pObj->Release(); |
| } |
| } |
| return pDict; |
| } |
| if (first_char == '[') { |
| if (!bAllowNestedArray && bInArray) { |
| return NULL; |
| } |
| CPDF_Array* pArray = new CPDF_Array; |
| while (1) { |
| CPDF_Object* pObj = ReadNextObject(bAllowNestedArray, TRUE); |
| if (pObj) { |
| pArray->Add(pObj); |
| continue; |
| } |
| |
| if (m_WordSize == 0 || m_WordBuffer[0] == ']') |
| break; |
| } |
| return pArray; |
| } |
| if (m_WordSize == 4) { |
| if (memcmp(m_WordBuffer, "true", 4) == 0) { |
| return new CPDF_Boolean(TRUE); |
| } |
| if (memcmp(m_WordBuffer, "null", 4) == 0) { |
| return new CPDF_Null; |
| } |
| } else if (m_WordSize == 5) { |
| if (memcmp(m_WordBuffer, "false", 5) == 0) { |
| return new CPDF_Boolean(FALSE); |
| } |
| } |
| return NULL; |
| } |
| |
| void CPDF_StreamParser::GetNextWord(FX_BOOL& bIsNumber) { |
| m_WordSize = 0; |
| bIsNumber = TRUE; |
| if (!PositionIsInBounds()) |
| return; |
| |
| int ch = m_pBuf[m_Pos++]; |
| while (1) { |
| while (PDFCharIsWhitespace(ch)) { |
| if (!PositionIsInBounds()) { |
| return; |
| } |
| ch = m_pBuf[m_Pos++]; |
| } |
| |
| if (ch != '%') |
| break; |
| |
| while (1) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| if (PDFCharIsLineEnding(ch)) |
| break; |
| } |
| } |
| |
| if (PDFCharIsDelimiter(ch)) { |
| bIsNumber = FALSE; |
| m_WordBuffer[m_WordSize++] = ch; |
| if (ch == '/') { |
| while (1) { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| if (!PDFCharIsOther(ch) && !PDFCharIsNumeric(ch)) { |
| m_Pos--; |
| return; |
| } |
| |
| if (m_WordSize < MAX_WORD_BUFFER) |
| m_WordBuffer[m_WordSize++] = ch; |
| } |
| } else if (ch == '<') { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| if (ch == '<') |
| m_WordBuffer[m_WordSize++] = ch; |
| else |
| m_Pos--; |
| } else if (ch == '>') { |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| if (ch == '>') |
| m_WordBuffer[m_WordSize++] = ch; |
| else |
| m_Pos--; |
| } |
| return; |
| } |
| |
| while (1) { |
| if (m_WordSize < MAX_WORD_BUFFER) |
| m_WordBuffer[m_WordSize++] = ch; |
| if (!PDFCharIsNumeric(ch)) |
| bIsNumber = FALSE; |
| |
| if (!PositionIsInBounds()) |
| return; |
| ch = m_pBuf[m_Pos++]; |
| if (PDFCharIsDelimiter(ch) || PDFCharIsWhitespace(ch)) { |
| m_Pos--; |
| break; |
| } |
| } |
| } |
| |
| CFX_ByteString CPDF_StreamParser::ReadString() { |
| if (!PositionIsInBounds()) |
| return CFX_ByteString(); |
| |
| uint8_t ch = m_pBuf[m_Pos++]; |
| CFX_ByteTextBuf buf; |
| int parlevel = 0; |
| int status = 0; |
| int iEscCode = 0; |
| while (1) { |
| switch (status) { |
| case 0: |
| if (ch == ')') { |
| if (parlevel == 0) { |
| if (buf.GetLength() > MAX_STRING_LENGTH) { |
| return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH); |
| } |
| return buf.GetByteString(); |
| } |
| parlevel--; |
| buf.AppendChar(')'); |
| } else if (ch == '(') { |
| parlevel++; |
| buf.AppendChar('('); |
| } else if (ch == '\\') { |
| status = 1; |
| } else { |
| buf.AppendChar((char)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') { |
| } else { |
| 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 (!PositionIsInBounds()) |
| break; |
| |
| ch = m_pBuf[m_Pos++]; |
| } |
| if (PositionIsInBounds()) |
| ++m_Pos; |
| |
| if (buf.GetLength() > MAX_STRING_LENGTH) { |
| return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH); |
| } |
| return buf.GetByteString(); |
| } |
| |
| CFX_ByteString CPDF_StreamParser::ReadHexString() { |
| if (!PositionIsInBounds()) |
| return CFX_ByteString(); |
| |
| CFX_ByteTextBuf buf; |
| bool bFirst = true; |
| int code = 0; |
| while (PositionIsInBounds()) { |
| int ch = m_pBuf[m_Pos++]; |
| |
| if (ch == '>') |
| break; |
| |
| if (!std::isxdigit(ch)) |
| continue; |
| |
| int val = FXSYS_toHexDigit(ch); |
| if (bFirst) { |
| code = val * 16; |
| } else { |
| code += val; |
| buf.AppendByte((uint8_t)code); |
| } |
| bFirst = !bFirst; |
| } |
| if (!bFirst) |
| buf.AppendChar((char)code); |
| |
| if (buf.GetLength() > MAX_STRING_LENGTH) |
| return CFX_ByteString(buf.GetBuffer(), MAX_STRING_LENGTH); |
| |
| return buf.GetByteString(); |
| } |
| |
| bool CPDF_StreamParser::PositionIsInBounds() const { |
| return m_Pos < m_Size; |
| } |
| |
| CPDF_ContentParser::CPDF_ContentParser() |
| : m_Status(Ready), |
| m_InternalStage(STAGE_GETCONTENT), |
| m_pObjectHolder(nullptr), |
| m_bForm(false), |
| m_pType3Char(nullptr), |
| m_pData(nullptr), |
| m_Size(0), |
| m_CurrentOffset(0) {} |
| |
| CPDF_ContentParser::~CPDF_ContentParser() { |
| if (!m_pSingleStream) |
| FX_Free(m_pData); |
| } |
| |
| void CPDF_ContentParser::Start(CPDF_Page* pPage, CPDF_ParseOptions* pOptions) { |
| if (m_Status != Ready || !pPage || !pPage->m_pDocument || |
| !pPage->m_pFormDict) { |
| m_Status = Done; |
| return; |
| } |
| m_pObjectHolder = pPage; |
| m_bForm = FALSE; |
| if (pOptions) { |
| m_Options = *pOptions; |
| } |
| m_Status = ToBeContinued; |
| m_InternalStage = STAGE_GETCONTENT; |
| m_CurrentOffset = 0; |
| |
| CPDF_Object* pContent = pPage->m_pFormDict->GetElementValue("Contents"); |
| if (!pContent) { |
| m_Status = Done; |
| return; |
| } |
| if (CPDF_Stream* pStream = pContent->AsStream()) { |
| m_nStreams = 0; |
| m_pSingleStream.reset(new CPDF_StreamAcc); |
| m_pSingleStream->LoadAllData(pStream, FALSE); |
| } else if (CPDF_Array* pArray = pContent->AsArray()) { |
| m_nStreams = pArray->GetCount(); |
| if (m_nStreams) |
| m_StreamArray.resize(m_nStreams); |
| else |
| m_Status = Done; |
| } else { |
| m_Status = Done; |
| } |
| } |
| |
| void CPDF_ContentParser::Start(CPDF_Form* pForm, |
| CPDF_AllStates* pGraphicStates, |
| CFX_Matrix* pParentMatrix, |
| CPDF_Type3Char* pType3Char, |
| CPDF_ParseOptions* pOptions, |
| int level) { |
| m_pType3Char = pType3Char; |
| m_pObjectHolder = pForm; |
| m_bForm = TRUE; |
| CFX_Matrix form_matrix = pForm->m_pFormDict->GetMatrixBy("Matrix"); |
| if (pGraphicStates) { |
| form_matrix.Concat(pGraphicStates->m_CTM); |
| } |
| CPDF_Array* pBBox = pForm->m_pFormDict->GetArrayBy("BBox"); |
| CFX_FloatRect form_bbox; |
| CPDF_Path ClipPath; |
| if (pBBox) { |
| form_bbox = pBBox->GetRect(); |
| ClipPath.New(); |
| ClipPath.AppendRect(form_bbox.left, form_bbox.bottom, form_bbox.right, |
| form_bbox.top); |
| ClipPath.Transform(&form_matrix); |
| if (pParentMatrix) { |
| ClipPath.Transform(pParentMatrix); |
| } |
| form_bbox.Transform(&form_matrix); |
| if (pParentMatrix) { |
| form_bbox.Transform(pParentMatrix); |
| } |
| } |
| CPDF_Dictionary* pResources = pForm->m_pFormDict->GetDictBy("Resources"); |
| m_pParser.reset(new CPDF_StreamContentParser( |
| pForm->m_pDocument, pForm->m_pPageResources, pForm->m_pResources, |
| pParentMatrix, pForm, pResources, &form_bbox, pOptions, pGraphicStates, |
| level)); |
| m_pParser->GetCurStates()->m_CTM = form_matrix; |
| m_pParser->GetCurStates()->m_ParentMatrix = form_matrix; |
| if (ClipPath.NotNull()) { |
| m_pParser->GetCurStates()->m_ClipPath.AppendPath(ClipPath, FXFILL_WINDING, |
| TRUE); |
| } |
| if (pForm->m_Transparency & PDFTRANS_GROUP) { |
| CPDF_GeneralStateData* pData = |
| m_pParser->GetCurStates()->m_GeneralState.GetModify(); |
| pData->m_BlendType = FXDIB_BLEND_NORMAL; |
| pData->m_StrokeAlpha = 1.0f; |
| pData->m_FillAlpha = 1.0f; |
| pData->m_pSoftMask = NULL; |
| } |
| m_nStreams = 0; |
| m_pSingleStream.reset(new CPDF_StreamAcc); |
| m_pSingleStream->LoadAllData(pForm->m_pFormStream, FALSE); |
| m_pData = (uint8_t*)m_pSingleStream->GetData(); |
| m_Size = m_pSingleStream->GetSize(); |
| m_Status = ToBeContinued; |
| m_InternalStage = STAGE_PARSE; |
| m_CurrentOffset = 0; |
| } |
| |
| void CPDF_ContentParser::Continue(IFX_Pause* pPause) { |
| int steps = 0; |
| while (m_Status == ToBeContinued) { |
| if (m_InternalStage == STAGE_GETCONTENT) { |
| if (m_CurrentOffset == m_nStreams) { |
| if (!m_StreamArray.empty()) { |
| FX_SAFE_DWORD safeSize = 0; |
| for (const auto& stream : m_StreamArray) { |
| safeSize += stream->GetSize(); |
| safeSize += 1; |
| } |
| if (!safeSize.IsValid()) { |
| m_Status = Done; |
| return; |
| } |
| m_Size = safeSize.ValueOrDie(); |
| m_pData = FX_Alloc(uint8_t, m_Size); |
| uint32_t pos = 0; |
| for (const auto& stream : m_StreamArray) { |
| FXSYS_memcpy(m_pData + pos, stream->GetData(), stream->GetSize()); |
| pos += stream->GetSize(); |
| m_pData[pos++] = ' '; |
| } |
| m_StreamArray.clear(); |
| } else { |
| m_pData = (uint8_t*)m_pSingleStream->GetData(); |
| m_Size = m_pSingleStream->GetSize(); |
| } |
| m_InternalStage = STAGE_PARSE; |
| m_CurrentOffset = 0; |
| } else { |
| CPDF_Array* pContent = |
| m_pObjectHolder->m_pFormDict->GetArrayBy("Contents"); |
| m_StreamArray[m_CurrentOffset].reset(new CPDF_StreamAcc); |
| CPDF_Stream* pStreamObj = ToStream( |
| pContent ? pContent->GetElementValue(m_CurrentOffset) : nullptr); |
| m_StreamArray[m_CurrentOffset]->LoadAllData(pStreamObj, FALSE); |
| m_CurrentOffset++; |
| } |
| } |
| if (m_InternalStage == STAGE_PARSE) { |
| if (!m_pParser) { |
| m_pParser.reset(new CPDF_StreamContentParser( |
| m_pObjectHolder->m_pDocument, m_pObjectHolder->m_pPageResources, |
| nullptr, nullptr, m_pObjectHolder, m_pObjectHolder->m_pResources, |
| &m_pObjectHolder->m_BBox, &m_Options, nullptr, 0)); |
| m_pParser->GetCurStates()->m_ColorState.GetModify()->Default(); |
| } |
| if (m_CurrentOffset >= m_Size) { |
| m_InternalStage = STAGE_CHECKCLIP; |
| } else { |
| m_CurrentOffset += |
| m_pParser->Parse(m_pData + m_CurrentOffset, |
| m_Size - m_CurrentOffset, PARSE_STEP_LIMIT); |
| } |
| } |
| if (m_InternalStage == STAGE_CHECKCLIP) { |
| if (m_pType3Char) { |
| m_pType3Char->m_bColored = m_pParser->IsColored(); |
| m_pType3Char->m_Width = |
| FXSYS_round(m_pParser->GetType3Data()[0] * 1000); |
| m_pType3Char->m_BBox.left = |
| FXSYS_round(m_pParser->GetType3Data()[2] * 1000); |
| m_pType3Char->m_BBox.bottom = |
| FXSYS_round(m_pParser->GetType3Data()[3] * 1000); |
| m_pType3Char->m_BBox.right = |
| FXSYS_round(m_pParser->GetType3Data()[4] * 1000); |
| m_pType3Char->m_BBox.top = |
| FXSYS_round(m_pParser->GetType3Data()[5] * 1000); |
| } |
| for (auto& pObj : *m_pObjectHolder->GetPageObjectList()) { |
| if (pObj->m_ClipPath.IsNull()) { |
| continue; |
| } |
| if (pObj->m_ClipPath.GetPathCount() != 1) { |
| continue; |
| } |
| if (pObj->m_ClipPath.GetTextCount()) { |
| continue; |
| } |
| CPDF_Path ClipPath = pObj->m_ClipPath.GetPath(0); |
| if (!ClipPath.IsRect() || pObj->IsShading()) { |
| continue; |
| } |
| CFX_FloatRect old_rect(ClipPath.GetPointX(0), ClipPath.GetPointY(0), |
| ClipPath.GetPointX(2), ClipPath.GetPointY(2)); |
| CFX_FloatRect obj_rect(pObj->m_Left, pObj->m_Bottom, pObj->m_Right, |
| pObj->m_Top); |
| if (old_rect.Contains(obj_rect)) { |
| pObj->m_ClipPath.SetNull(); |
| } |
| } |
| m_Status = Done; |
| return; |
| } |
| steps++; |
| if (pPause && pPause->NeedToPauseNow()) { |
| break; |
| } |
| } |
| } |
