CPDF_Stream* CPDF_StreamParser::ReadInlineStream(CPDF_Document* pDoc, CPDF_Dictionary* pDict, CPDF_Object* pCSObj, FX_BOOL bDecode)
{
if (m_Pos == m_Size) {
return NULL;
}
if (PDF_CharType[m_pBuf[m_Pos]] == 'W') {
m_Pos ++;
}
CFX_ByteString Decoder;
CPDF_Dictionary* pParam = NULL;
CPDF_Object* pFilter = pDict->GetElementValue(FX_BSTRC("Filter"));
if (pFilter == NULL) {
} else if (pFilter->GetType() == PDFOBJ_ARRAY) {
Decoder = ((CPDF_Array*)pFilter)->GetString(0);
CPDF_Array* pParams = pDict->GetArray(FX_BSTRC("DecodeParms"));
if (pParams) {
pParam = pParams->GetDict(0);
}
} else {
Decoder = pFilter->GetString();
pParam = pDict->GetDict(FX_BSTRC("DecodeParms"));
}
FX_DWORD width = pDict->GetInteger(FX_BSTRC("Width"));
FX_DWORD height = pDict->GetInteger(FX_BSTRC("Height"));
FX_DWORD OrigSize = 0;
if (pCSObj != NULL) {
FX_DWORD bpc = pDict->GetInteger(FX_BSTRC("BitsPerComponent"));
FX_DWORD nComponents = 1;
CPDF_ColorSpace* pCS = pDoc->LoadColorSpace(pCSObj);
if (pCS == NULL) {
nComponents = 3;
} else {
nComponents = pCS->CountComponents();
pDoc->GetPageData()->ReleaseColorSpace(pCSObj);
}
FX_DWORD 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;
FX_DWORD 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 {
FX_DWORD dwDestSize = OrigSize;
dwStreamSize = PDF_DecodeInlineStream(m_pBuf + m_Pos, m_Size - m_Pos, width, height, Decoder, pParam,
pData, dwDestSize);
if ((int)dwStreamSize < 0) {
return NULL;
}
if (bDecode) {
m_Pos += dwStreamSize;
dwStreamSize = dwDestSize;
if (pFilter->GetType() == PDFOBJ_ARRAY) {
((CPDF_Array*)pFilter)->RemoveAt(0);
CPDF_Array* pParams = pDict->GetArray(FX_BSTRC("DecodeParms"));
if (pParams) {
pParams->RemoveAt(0);
}
} else {
pDict->RemoveAt(FX_BSTRC("Filter"));
pDict->RemoveAt(FX_BSTRC("DecodeParms"));
}
} else {
if (pData) {
FX_Free(pData);
}
FX_DWORD dwSavePos = m_Pos;
m_Pos += dwStreamSize;
while (1) {
FX_DWORD 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(FX_BSTRC("Length"), (int)dwStreamSize);
return CPDF_Stream::Create(pData, dwStreamSize, pDict);
}
std::unique_ptr<CPDF_Stream> CPDF_StreamParser::ReadInlineStream(
CPDF_Document* pDoc,
std::unique_ptr<CPDF_Dictionary> pDict,
const CPDF_Object* pCSObj) {
if (m_Pos < m_pBuf.size() && PDFCharIsWhitespace(m_pBuf[m_Pos]))
m_Pos++;
if (m_Pos == m_pBuf.size())
return nullptr;
ByteString Decoder;
CPDF_Dictionary* pParam = nullptr;
CPDF_Object* pFilter = pDict->GetDirectObjectFor("Filter");
if (pFilter) {
if (CPDF_Array* pArray = pFilter->AsArray()) {
Decoder = pArray->GetStringAt(0);
CPDF_Array* pParams = pDict->GetArrayFor(pdfium::stream::kDecodeParms);
if (pParams)
pParam = pParams->GetDictAt(0);
} else {
Decoder = pFilter->GetString();
pParam = pDict->GetDictFor(pdfium::stream::kDecodeParms);
}
}
uint32_t width = pDict->GetIntegerFor("Width");
uint32_t height = pDict->GetIntegerFor("Height");
uint32_t OrigSize = 0;
if (pCSObj) {
uint32_t bpc = pDict->GetIntegerFor("BitsPerComponent");
uint32_t nComponents = 1;
CPDF_ColorSpace* pCS = pDoc->LoadColorSpace(pCSObj, nullptr);
if (pCS) {
nComponents = pCS->CountComponents();
pDoc->GetPageData()->ReleaseColorSpace(pCSObj);
} else {
nComponents = 3;
}
uint32_t pitch = width;
if (bpc && pitch > INT_MAX / bpc)
return nullptr;
pitch *= bpc;
if (nComponents && pitch > INT_MAX / nComponents)
return nullptr;
pitch *= nComponents;
if (pitch > INT_MAX - 7)
return nullptr;
pitch += 7;
pitch /= 8;
OrigSize = pitch;
} else {
if (width > INT_MAX - 7)
return nullptr;
OrigSize = ((width + 7) / 8);
}
if (height && OrigSize > INT_MAX / height)
return nullptr;
OrigSize *= height;
std::unique_ptr<uint8_t, FxFreeDeleter> pData;
uint32_t dwStreamSize;
if (Decoder.IsEmpty()) {
if (OrigSize > m_pBuf.size() - m_Pos)
OrigSize = m_pBuf.size() - m_Pos;
pData.reset(FX_Alloc(uint8_t, OrigSize));
auto copy_span = m_pBuf.subspan(m_Pos, OrigSize);
memcpy(pData.get(), copy_span.data(), copy_span.size());
dwStreamSize = OrigSize;
m_Pos += OrigSize;
} else {
dwStreamSize = DecodeInlineStream(m_pBuf.subspan(m_Pos), width, height,
Decoder, pParam, OrigSize);
if (static_cast<int>(dwStreamSize) < 0)
return nullptr;
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 (GetWord() == "EI") {
m_Pos = dwPrevPos;
break;
}
dwStreamSize += m_Pos - dwPrevPos;
}
m_Pos = dwSavePos;
pData.reset(FX_Alloc(uint8_t, dwStreamSize));
auto copy_span = m_pBuf.subspan(m_Pos, dwStreamSize);
memcpy(pData.get(), copy_span.data(), copy_span.size());
m_Pos += dwStreamSize;
}
pDict->SetNewFor<CPDF_Number>("Length", static_cast<int>(dwStreamSize));
return pdfium::MakeUnique<CPDF_Stream>(std::move(pData), dwStreamSize,
std::move(pDict));
}
