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PL286/external/pdfium/xfa/fgas/crt/fgas_stream.cpp

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// 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 "xfa/fgas/crt/fgas_stream.h"
#if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
_FX_OS_ == _FX_WIN64_
#include <io.h>
#endif
#include <algorithm>
#include <memory>
#include "third_party/base/ptr_util.h"
#include "xfa/fgas/crt/fgas_codepage.h"
namespace {
class IFGAS_StreamImp {
public:
virtual ~IFGAS_StreamImp() {}
virtual int32_t GetLength() const = 0;
virtual int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) = 0;
virtual int32_t GetPosition() = 0;
virtual bool IsEOF() const = 0;
virtual int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) = 0;
virtual int32_t ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) = 0;
virtual int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) = 0;
virtual int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) = 0;
virtual void Flush() = 0;
virtual bool SetLength(int32_t iLength) = 0;
protected:
IFGAS_StreamImp();
uint32_t GetAccessModes() const { return m_dwAccess; }
void SetAccessModes(uint32_t modes) { m_dwAccess = modes; }
private:
uint32_t m_dwAccess;
};
class CFGAS_FileStreamImp : public IFGAS_StreamImp {
public:
CFGAS_FileStreamImp();
~CFGAS_FileStreamImp() override;
bool LoadFile(const FX_WCHAR* pszSrcFileName, uint32_t dwAccess);
// IFGAS_StreamImp:
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override;
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
void Flush() override;
bool SetLength(int32_t iLength) override;
protected:
FXSYS_FILE* m_hFile;
int32_t m_iLength;
};
class CFGAS_BufferStreamImp : public IFGAS_StreamImp {
public:
CFGAS_BufferStreamImp();
~CFGAS_BufferStreamImp() override {}
bool LoadBuffer(uint8_t* pData, int32_t iTotalSize, uint32_t dwAccess);
// IFGAS_StreamImp:
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override;
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
void Flush() override {}
bool SetLength(int32_t iLength) override { return false; }
protected:
uint8_t* m_pData;
int32_t m_iTotalSize;
int32_t m_iPosition;
int32_t m_iLength;
};
class CFGAS_FileReadStreamImp : public IFGAS_StreamImp {
public:
CFGAS_FileReadStreamImp();
~CFGAS_FileReadStreamImp() override {}
bool LoadFileRead(const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
uint32_t dwAccess);
// IFGAS_StreamImp:
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override { return m_iPosition; }
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override {
return 0;
}
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override {
return 0;
}
void Flush() override {}
bool SetLength(int32_t iLength) override { return false; }
protected:
CFX_RetainPtr<IFX_SeekableReadStream> m_pFileRead;
int32_t m_iPosition;
int32_t m_iLength;
};
class CFGAS_BufferReadStreamImp : public IFGAS_StreamImp {
public:
CFGAS_BufferReadStreamImp();
~CFGAS_BufferReadStreamImp() override;
bool LoadBufferRead(const CFX_RetainPtr<IFX_BufferedReadStream>& pBufferRead,
int32_t iFileSize,
uint32_t dwAccess);
// IFGAS_StreamImp:
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override { return m_iPosition; }
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override {
return 0;
}
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override {
return 0;
}
void Flush() override {}
bool SetLength(int32_t iLength) override { return false; }
private:
CFX_RetainPtr<IFX_BufferedReadStream> m_pBufferRead;
int32_t m_iPosition;
int32_t m_iBufferSize;
};
class CFGAS_FileWriteStreamImp : public IFGAS_StreamImp {
public:
CFGAS_FileWriteStreamImp();
~CFGAS_FileWriteStreamImp() override {}
bool LoadFileWrite(const CFX_RetainPtr<IFX_SeekableWriteStream>& pFileWrite,
uint32_t dwAccess);
// IFGAS_StreamImp:
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override { return m_iPosition; }
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override { return 0; }
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override {
return 0;
}
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
void Flush() override;
bool SetLength(int32_t iLength) override { return false; }
protected:
CFX_RetainPtr<IFX_SeekableWriteStream> m_pFileWrite;
int32_t m_iPosition;
};
enum FX_STREAMTYPE {
FX_SREAMTYPE_Unknown = 0,
FX_STREAMTYPE_File,
FX_STREAMTYPE_Buffer,
FX_STREAMTYPE_Stream,
FX_STREAMTYPE_BufferRead,
};
class CFGAS_Stream : public IFGAS_Stream {
public:
template <typename T, typename... Args>
friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
bool LoadFile(const FX_WCHAR* pszSrcFileName, uint32_t dwAccess);
bool LoadBuffer(uint8_t* pData, int32_t iTotalSize, uint32_t dwAccess);
bool LoadFileRead(const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
uint32_t dwAccess);
bool LoadFileWrite(const CFX_RetainPtr<IFX_SeekableWriteStream>& pFileWrite,
uint32_t dwAccess);
bool LoadBufferRead(const CFX_RetainPtr<IFX_BufferedReadStream>& pBufferRead,
int32_t iFileSize,
uint32_t dwAccess);
// IFGAS_Stream
uint32_t GetAccessModes() const override;
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override;
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
void Flush() override;
bool SetLength(int32_t iLength) override;
int32_t GetBOM(uint8_t bom[4]) const override;
uint16_t GetCodePage() const override;
uint16_t SetCodePage(uint16_t wCodePage) override;
CFX_RetainPtr<IFGAS_Stream> CreateSharedStream(uint32_t dwAccess,
int32_t iOffset,
int32_t iLength) override;
protected:
CFGAS_Stream();
~CFGAS_Stream() override;
FX_STREAMTYPE m_eStreamType;
IFGAS_StreamImp* m_pStreamImp;
uint32_t m_dwAccess;
int32_t m_iTotalSize;
int32_t m_iPosition;
int32_t m_iStart;
int32_t m_iLength;
int32_t m_iRefCount;
};
class CFGAS_TextStream : public IFGAS_Stream {
public:
template <typename T, typename... Args>
friend CFX_RetainPtr<T> pdfium::MakeRetain(Args&&... args);
// IFGAS_Stream
uint32_t GetAccessModes() const override;
int32_t GetLength() const override;
int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
int32_t GetPosition() override;
bool IsEOF() const override;
int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
void Flush() override;
bool SetLength(int32_t iLength) override;
int32_t GetBOM(uint8_t bom[4]) const override;
uint16_t GetCodePage() const override;
uint16_t SetCodePage(uint16_t wCodePage) override;
CFX_RetainPtr<IFGAS_Stream> CreateSharedStream(uint32_t dwAccess,
int32_t iOffset,
int32_t iLength) override;
protected:
explicit CFGAS_TextStream(const CFX_RetainPtr<IFGAS_Stream>& pStream);
~CFGAS_TextStream() override;
void InitStream();
uint16_t m_wCodePage;
int32_t m_wBOMLength;
uint32_t m_dwBOM;
uint8_t* m_pBuf;
int32_t m_iBufSize;
CFX_RetainPtr<IFGAS_Stream> m_pStreamImp;
};
class CFGAS_FileRead : public IFX_SeekableReadStream {
public:
static CFX_RetainPtr<CFGAS_FileRead> Create(
const CFX_RetainPtr<IFGAS_Stream>& pStream);
explicit CFGAS_FileRead(const CFX_RetainPtr<IFGAS_Stream>& pStream);
~CFGAS_FileRead() override;
// IFX_SeekableReadStream
FX_FILESIZE GetSize() override;
bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
protected:
CFX_RetainPtr<IFGAS_Stream> m_pStream;
};
int32_t FileLength(FXSYS_FILE* file) {
ASSERT(file);
#if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_
return _filelength(_fileno(file));
#else
int32_t iPos = FXSYS_ftell(file);
FXSYS_fseek(file, 0, FXSYS_SEEK_END);
int32_t iLen = FXSYS_ftell(file);
FXSYS_fseek(file, iPos, FXSYS_SEEK_SET);
return iLen;
#endif
}
bool FileSetSize(FXSYS_FILE* file, int32_t size) {
ASSERT(file);
#if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN64_
return _chsize(_fileno(file), size) == 0;
#elif _FX_OS_ == _FX_WIN32_MOBILE_
HANDLE hFile = _fileno(file);
uint32_t dwPos = ::SetFilePointer(hFile, 0, 0, FILE_CURRENT);
::SetFilePointer(hFile, size, 0, FILE_BEGIN);
bool bRet = ::SetEndOfFile(hFile);
::SetFilePointer(hFile, (int32_t)dwPos, 0, FILE_BEGIN);
return bRet;
#else
return false;
#endif
}
} // namespace
// static
CFX_RetainPtr<IFGAS_Stream> IFGAS_Stream::CreateStream(
const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
uint32_t dwAccess) {
auto pSR = pdfium::MakeRetain<CFGAS_Stream>();
if (!pSR->LoadFileRead(pFileRead, dwAccess))
return nullptr;
if (dwAccess & FX_STREAMACCESS_Text)
return pdfium::MakeRetain<CFGAS_TextStream>(pSR);
return pSR;
}
// static
CFX_RetainPtr<IFGAS_Stream> IFGAS_Stream::CreateStream(
const CFX_RetainPtr<IFX_SeekableWriteStream>& pFileWrite,
uint32_t dwAccess) {
auto pSR = pdfium::MakeRetain<CFGAS_Stream>();
if (!pSR->LoadFileWrite(pFileWrite, dwAccess))
return nullptr;
if (dwAccess & FX_STREAMACCESS_Text)
return pdfium::MakeRetain<CFGAS_TextStream>(pSR);
return pSR;
}
// static
CFX_RetainPtr<IFGAS_Stream> IFGAS_Stream::CreateStream(uint8_t* pData,
int32_t length,
uint32_t dwAccess) {
auto pSR = pdfium::MakeRetain<CFGAS_Stream>();
if (!pSR->LoadBuffer(pData, length, dwAccess))
return nullptr;
if (dwAccess & FX_STREAMACCESS_Text)
return pdfium::MakeRetain<CFGAS_TextStream>(pSR);
return pSR;
}
IFGAS_StreamImp::IFGAS_StreamImp() : m_dwAccess(0) {}
CFGAS_FileStreamImp::CFGAS_FileStreamImp() : m_hFile(nullptr), m_iLength(0) {}
CFGAS_FileStreamImp::~CFGAS_FileStreamImp() {
if (m_hFile)
FXSYS_fclose(m_hFile);
}
bool CFGAS_FileStreamImp::LoadFile(const FX_WCHAR* pszSrcFileName,
uint32_t dwAccess) {
ASSERT(!m_hFile);
ASSERT(pszSrcFileName && FXSYS_wcslen(pszSrcFileName) > 0);
#if _FX_OS_ == _FX_WIN32_DESKTOP_ || _FX_OS_ == _FX_WIN32_MOBILE_ || \
_FX_OS_ == _FX_WIN64_
const FX_WCHAR* wsMode;
if (dwAccess & FX_STREAMACCESS_Write) {
if (dwAccess & FX_STREAMACCESS_Append) {
wsMode = L"a+b";
} else if (dwAccess & FX_STREAMACCESS_Truncate) {
wsMode = L"w+b";
} else {
wsMode = L"r+b";
}
} else {
wsMode = L"rb";
}
m_hFile = FXSYS_wfopen(pszSrcFileName, wsMode);
if (!m_hFile) {
if (dwAccess & FX_STREAMACCESS_Write) {
if (dwAccess & FX_STREAMACCESS_Create)
m_hFile = FXSYS_wfopen(pszSrcFileName, L"w+b");
if (!m_hFile) {
m_hFile = FXSYS_wfopen(pszSrcFileName, L"r+b");
if (!m_hFile)
return false;
if (dwAccess & FX_STREAMACCESS_Truncate)
FileSetSize(m_hFile, 0);
}
} else {
return false;
}
}
#else
const FX_CHAR* wsMode = "rb";
if (dwAccess & FX_STREAMACCESS_Write) {
if (dwAccess & FX_STREAMACCESS_Append) {
wsMode = "a+b";
} else if (dwAccess & FX_STREAMACCESS_Truncate) {
wsMode = "w+b";
} else {
wsMode = "r+b";
}
}
CFX_ByteString szFileName = CFX_ByteString::FromUnicode(pszSrcFileName);
m_hFile = FXSYS_fopen(szFileName.c_str(), wsMode);
if (!m_hFile) {
if (dwAccess & FX_STREAMACCESS_Write) {
if (dwAccess & FX_STREAMACCESS_Create) {
m_hFile = FXSYS_fopen(szFileName.c_str(), "w+b");
}
if (!m_hFile) {
m_hFile = FXSYS_fopen(szFileName.c_str(), "r+b");
if (!m_hFile) {
return false;
}
if (dwAccess & FX_STREAMACCESS_Truncate) {
FileSetSize(m_hFile, 0);
}
}
} else {
return false;
}
}
#endif
SetAccessModes(dwAccess);
if ((dwAccess & (FX_STREAMACCESS_Write | FX_STREAMACCESS_Truncate)) ==
(FX_STREAMACCESS_Write | FX_STREAMACCESS_Truncate)) {
m_iLength = 0;
} else {
m_iLength = FileLength(m_hFile);
}
return true;
}
int32_t CFGAS_FileStreamImp::GetLength() const {
ASSERT(m_hFile);
return m_iLength;
}
int32_t CFGAS_FileStreamImp::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
ASSERT(m_hFile);
FXSYS_fseek(m_hFile, iOffset, eSeek);
return FXSYS_ftell(m_hFile);
}
int32_t CFGAS_FileStreamImp::GetPosition() {
ASSERT(m_hFile);
return FXSYS_ftell(m_hFile);
}
bool CFGAS_FileStreamImp::IsEOF() const {
ASSERT(m_hFile);
return FXSYS_ftell(m_hFile) >= m_iLength;
}
int32_t CFGAS_FileStreamImp::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
ASSERT(m_hFile);
ASSERT(pBuffer && iBufferSize > 0);
return FXSYS_fread(pBuffer, 1, iBufferSize, m_hFile);
}
int32_t CFGAS_FileStreamImp::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(m_hFile);
ASSERT(pStr && iMaxLength > 0);
if (m_iLength <= 0) {
return 0;
}
int32_t iPosition = FXSYS_ftell(m_hFile);
int32_t iLen = std::min((m_iLength - iPosition) / 2, iMaxLength);
if (iLen <= 0) {
return 0;
}
iLen = FXSYS_fread(pStr, 2, iLen, m_hFile);
int32_t iCount = 0;
while (*pStr != L'\0' && iCount < iLen) {
pStr++, iCount++;
}
iPosition += iCount * 2;
if (FXSYS_ftell(m_hFile) != iPosition) {
FXSYS_fseek(m_hFile, iPosition, 0);
}
bEOS = (iPosition >= m_iLength);
return iCount;
}
int32_t CFGAS_FileStreamImp::WriteData(const uint8_t* pBuffer,
int32_t iBufferSize) {
ASSERT(m_hFile && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
ASSERT(pBuffer && iBufferSize > 0);
int32_t iRet = FXSYS_fwrite(pBuffer, 1, iBufferSize, m_hFile);
if (iRet != 0) {
int32_t iPos = FXSYS_ftell(m_hFile);
if (iPos > m_iLength) {
m_iLength = iPos;
}
}
return iRet;
}
int32_t CFGAS_FileStreamImp::WriteString(const FX_WCHAR* pStr,
int32_t iLength) {
ASSERT(m_hFile && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
ASSERT(pStr && iLength > 0);
int32_t iRet = FXSYS_fwrite(pStr, 2, iLength, m_hFile);
if (iRet != 0) {
int32_t iPos = FXSYS_ftell(m_hFile);
if (iPos > m_iLength) {
m_iLength = iPos;
}
}
return iRet;
}
void CFGAS_FileStreamImp::Flush() {
ASSERT(m_hFile && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
FXSYS_fflush(m_hFile);
}
bool CFGAS_FileStreamImp::SetLength(int32_t iLength) {
ASSERT(m_hFile && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
bool bRet = FileSetSize(m_hFile, iLength);
m_iLength = FileLength(m_hFile);
return bRet;
}
CFGAS_FileReadStreamImp::CFGAS_FileReadStreamImp()
: m_pFileRead(nullptr), m_iPosition(0), m_iLength(0) {}
bool CFGAS_FileReadStreamImp::LoadFileRead(
const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
uint32_t dwAccess) {
ASSERT(!m_pFileRead && pFileRead);
if (dwAccess & FX_STREAMACCESS_Write)
return false;
m_pFileRead = pFileRead;
m_iLength = m_pFileRead->GetSize();
return true;
}
int32_t CFGAS_FileReadStreamImp::GetLength() const {
return m_iLength;
}
int32_t CFGAS_FileReadStreamImp::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
switch (eSeek) {
case FX_STREAMSEEK_Begin:
m_iPosition = iOffset;
break;
case FX_STREAMSEEK_Current:
m_iPosition += iOffset;
break;
case FX_STREAMSEEK_End:
m_iPosition = m_iLength + iOffset;
break;
}
if (m_iPosition < 0) {
m_iPosition = 0;
} else if (m_iPosition >= m_iLength) {
m_iPosition = m_iLength;
}
return m_iPosition;
}
bool CFGAS_FileReadStreamImp::IsEOF() const {
return m_iPosition >= m_iLength;
}
int32_t CFGAS_FileReadStreamImp::ReadData(uint8_t* pBuffer,
int32_t iBufferSize) {
ASSERT(m_pFileRead);
ASSERT(pBuffer && iBufferSize > 0);
if (iBufferSize > m_iLength - m_iPosition) {
iBufferSize = m_iLength - m_iPosition;
}
if (m_pFileRead->ReadBlock(pBuffer, m_iPosition, iBufferSize)) {
m_iPosition += iBufferSize;
return iBufferSize;
}
return 0;
}
int32_t CFGAS_FileReadStreamImp::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(m_pFileRead);
ASSERT(pStr && iMaxLength > 0);
iMaxLength = ReadData((uint8_t*)pStr, iMaxLength * 2) / 2;
if (iMaxLength <= 0) {
return 0;
}
int32_t i = 0;
while (i < iMaxLength && pStr[i] != L'\0') {
++i;
}
bEOS = (m_iPosition >= m_iLength) || pStr[i] == L'\0';
return i;
}
CFGAS_BufferReadStreamImp::CFGAS_BufferReadStreamImp()
: m_iPosition(0), m_iBufferSize(0) {}
CFGAS_BufferReadStreamImp::~CFGAS_BufferReadStreamImp() {}
bool CFGAS_BufferReadStreamImp::LoadBufferRead(
const CFX_RetainPtr<IFX_BufferedReadStream>& pBufferRead,
int32_t iFileSize,
uint32_t dwAccess) {
ASSERT(!m_pBufferRead && pBufferRead);
if (dwAccess & FX_STREAMACCESS_Write)
return false;
m_pBufferRead = pBufferRead;
m_iBufferSize = iFileSize;
if (m_iBufferSize >= 0)
return true;
if (!m_pBufferRead->ReadNextBlock(true))
return false;
m_iBufferSize = m_pBufferRead->GetBlockSize();
while (!m_pBufferRead->IsEOF()) {
m_pBufferRead->ReadNextBlock(false);
m_iBufferSize += m_pBufferRead->GetBlockSize();
}
return true;
}
int32_t CFGAS_BufferReadStreamImp::GetLength() const {
return m_iBufferSize;
}
int32_t CFGAS_BufferReadStreamImp::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
int32_t iLength = GetLength();
switch (eSeek) {
case FX_STREAMSEEK_Begin:
m_iPosition = iOffset;
break;
case FX_STREAMSEEK_Current:
m_iPosition += iOffset;
break;
case FX_STREAMSEEK_End:
m_iPosition = iLength + iOffset;
break;
}
if (m_iPosition < 0) {
m_iPosition = 0;
} else if (m_iPosition >= iLength) {
m_iPosition = iLength;
}
return m_iPosition;
}
bool CFGAS_BufferReadStreamImp::IsEOF() const {
return m_pBufferRead ? m_pBufferRead->IsEOF() : true;
}
int32_t CFGAS_BufferReadStreamImp::ReadData(uint8_t* pBuffer,
int32_t iBufferSize) {
ASSERT(m_pBufferRead);
ASSERT(pBuffer && iBufferSize > 0);
int32_t iLength = GetLength();
if (m_iPosition >= iLength) {
return 0;
}
if (iBufferSize > iLength - m_iPosition) {
iBufferSize = iLength - m_iPosition;
}
uint32_t dwBlockOffset = m_pBufferRead->GetBlockOffset();
uint32_t dwBlockSize = m_pBufferRead->GetBlockSize();
if (m_iPosition < (int32_t)dwBlockOffset) {
if (!m_pBufferRead->ReadNextBlock(true)) {
return 0;
}
dwBlockOffset = m_pBufferRead->GetBlockOffset();
dwBlockSize = m_pBufferRead->GetBlockSize();
}
while (m_iPosition < (int32_t)dwBlockOffset ||
m_iPosition >= (int32_t)(dwBlockOffset + dwBlockSize)) {
if (m_pBufferRead->IsEOF() || !m_pBufferRead->ReadNextBlock(false)) {
break;
}
dwBlockOffset = m_pBufferRead->GetBlockOffset();
dwBlockSize = m_pBufferRead->GetBlockSize();
}
if (m_iPosition < (int32_t)dwBlockOffset ||
m_iPosition >= (int32_t)(dwBlockOffset + dwBlockSize)) {
return 0;
}
const uint8_t* pBufferTmp = m_pBufferRead->GetBlockBuffer();
uint32_t dwOffsetTmp = m_iPosition - dwBlockOffset;
uint32_t dwCopySize =
std::min(iBufferSize, (int32_t)(dwBlockSize - dwOffsetTmp));
FXSYS_memcpy(pBuffer, pBufferTmp + dwOffsetTmp, dwCopySize);
dwOffsetTmp = dwCopySize;
iBufferSize -= dwCopySize;
while (iBufferSize > 0) {
if (!m_pBufferRead->ReadNextBlock(false)) {
break;
}
dwBlockOffset = m_pBufferRead->GetBlockOffset();
dwBlockSize = m_pBufferRead->GetBlockSize();
pBufferTmp = m_pBufferRead->GetBlockBuffer();
dwCopySize = std::min((uint32_t)iBufferSize, dwBlockSize);
FXSYS_memcpy(pBuffer + dwOffsetTmp, pBufferTmp, dwCopySize);
dwOffsetTmp += dwCopySize;
iBufferSize -= dwCopySize;
}
m_iPosition += dwOffsetTmp;
return dwOffsetTmp;
}
int32_t CFGAS_BufferReadStreamImp::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(m_pBufferRead);
ASSERT(pStr && iMaxLength > 0);
iMaxLength = ReadData((uint8_t*)pStr, iMaxLength * 2) / 2;
if (iMaxLength <= 0) {
return 0;
}
int32_t i = 0;
while (i < iMaxLength && pStr[i] != L'\0') {
++i;
}
bEOS = (m_iPosition >= GetLength()) || pStr[i] == L'\0';
return i;
}
CFGAS_FileWriteStreamImp::CFGAS_FileWriteStreamImp()
: m_pFileWrite(nullptr), m_iPosition(0) {}
bool CFGAS_FileWriteStreamImp::LoadFileWrite(
const CFX_RetainPtr<IFX_SeekableWriteStream>& pFileWrite,
uint32_t dwAccess) {
ASSERT(!m_pFileWrite && pFileWrite);
if (dwAccess & FX_STREAMACCESS_Read)
return false;
if (dwAccess & FX_STREAMACCESS_Append)
m_iPosition = pFileWrite->GetSize();
m_pFileWrite = pFileWrite;
return true;
}
int32_t CFGAS_FileWriteStreamImp::GetLength() const {
if (!m_pFileWrite)
return 0;
return (int32_t)m_pFileWrite->GetSize();
}
int32_t CFGAS_FileWriteStreamImp::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
int32_t iLength = GetLength();
switch (eSeek) {
case FX_STREAMSEEK_Begin:
m_iPosition = iOffset;
break;
case FX_STREAMSEEK_Current:
m_iPosition += iOffset;
break;
case FX_STREAMSEEK_End:
m_iPosition = iLength + iOffset;
break;
}
if (m_iPosition < 0) {
m_iPosition = 0;
} else if (m_iPosition >= iLength) {
m_iPosition = iLength;
}
return m_iPosition;
}
bool CFGAS_FileWriteStreamImp::IsEOF() const {
return m_iPosition >= GetLength();
}
int32_t CFGAS_FileWriteStreamImp::WriteData(const uint8_t* pBuffer,
int32_t iBufferSize) {
if (!m_pFileWrite) {
return 0;
}
if (m_pFileWrite->WriteBlock(pBuffer, m_iPosition, iBufferSize)) {
m_iPosition += iBufferSize;
}
return iBufferSize;
}
int32_t CFGAS_FileWriteStreamImp::WriteString(const FX_WCHAR* pStr,
int32_t iLength) {
return WriteData((const uint8_t*)pStr, iLength * sizeof(FX_WCHAR));
}
void CFGAS_FileWriteStreamImp::Flush() {
if (m_pFileWrite) {
m_pFileWrite->Flush();
}
}
CFGAS_BufferStreamImp::CFGAS_BufferStreamImp()
: m_pData(nullptr), m_iTotalSize(0), m_iPosition(0), m_iLength(0) {}
bool CFGAS_BufferStreamImp::LoadBuffer(uint8_t* pData,
int32_t iTotalSize,
uint32_t dwAccess) {
ASSERT(!m_pData && pData && iTotalSize > 0);
SetAccessModes(dwAccess);
m_pData = pData;
m_iTotalSize = iTotalSize;
m_iPosition = 0;
m_iLength = (dwAccess & FX_STREAMACCESS_Write) != 0 ? 0 : iTotalSize;
return true;
}
int32_t CFGAS_BufferStreamImp::GetLength() const {
ASSERT(m_pData);
return m_iLength;
}
int32_t CFGAS_BufferStreamImp::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
ASSERT(m_pData);
if (eSeek == FX_STREAMSEEK_Begin) {
m_iPosition = iOffset;
} else if (eSeek == FX_STREAMSEEK_Current) {
m_iPosition += iOffset;
} else if (eSeek == FX_STREAMSEEK_End) {
m_iPosition = m_iLength + iOffset;
}
if (m_iPosition > m_iLength) {
m_iPosition = m_iLength;
}
if (m_iPosition < 0) {
m_iPosition = 0;
}
return m_iPosition;
}
int32_t CFGAS_BufferStreamImp::GetPosition() {
ASSERT(m_pData);
return m_iPosition;
}
bool CFGAS_BufferStreamImp::IsEOF() const {
ASSERT(m_pData);
return m_iPosition >= m_iLength;
}
int32_t CFGAS_BufferStreamImp::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
ASSERT(m_pData);
ASSERT(pBuffer && iBufferSize > 0);
int32_t iLen = std::min(m_iLength - m_iPosition, iBufferSize);
if (iLen <= 0) {
return 0;
}
FXSYS_memcpy(pBuffer, m_pData + m_iPosition, iLen);
m_iPosition += iLen;
return iLen;
}
int32_t CFGAS_BufferStreamImp::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(m_pData);
ASSERT(pStr && iMaxLength > 0);
int32_t iLen = std::min((m_iLength - m_iPosition) / 2, iMaxLength);
if (iLen <= 0) {
return 0;
}
const FX_WCHAR* pSrc = (const FX_WCHAR*)(FX_CHAR*)(m_pData + m_iPosition);
int32_t iCount = 0;
while (*pSrc && iCount < iLen) {
*pStr++ = *pSrc++;
iCount++;
}
m_iPosition += iCount * 2;
bEOS = (*pSrc == L'\0') || (m_iPosition >= m_iLength);
return iCount;
}
int32_t CFGAS_BufferStreamImp::WriteData(const uint8_t* pBuffer,
int32_t iBufferSize) {
ASSERT(m_pData && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
ASSERT(pBuffer && iBufferSize > 0);
int32_t iLen = std::min(m_iTotalSize - m_iPosition, iBufferSize);
if (iLen <= 0) {
return 0;
}
FXSYS_memcpy(m_pData + m_iPosition, pBuffer, iLen);
m_iPosition += iLen;
if (m_iPosition > m_iLength) {
m_iLength = m_iPosition;
}
return iLen;
}
int32_t CFGAS_BufferStreamImp::WriteString(const FX_WCHAR* pStr,
int32_t iLength) {
ASSERT(m_pData && (GetAccessModes() & FX_STREAMACCESS_Write) != 0);
ASSERT(pStr && iLength > 0);
int32_t iLen = std::min((m_iTotalSize - m_iPosition) / 2, iLength);
if (iLen <= 0) {
return 0;
}
FXSYS_memcpy(m_pData + m_iPosition, pStr, iLen * 2);
m_iPosition += iLen * 2;
if (m_iPosition > m_iLength) {
m_iLength = m_iPosition;
}
return iLen;
}
// static
CFX_RetainPtr<IFGAS_Stream> IFGAS_Stream::CreateTextStream(
const CFX_RetainPtr<IFGAS_Stream>& pBaseStream) {
ASSERT(pBaseStream);
return pdfium::MakeRetain<CFGAS_TextStream>(pBaseStream);
}
CFGAS_TextStream::CFGAS_TextStream(const CFX_RetainPtr<IFGAS_Stream>& pStream)
: m_wCodePage(FX_CODEPAGE_DefANSI),
m_wBOMLength(0),
m_dwBOM(0),
m_pBuf(nullptr),
m_iBufSize(0),
m_pStreamImp(pStream) {
ASSERT(m_pStreamImp);
InitStream();
}
CFGAS_TextStream::~CFGAS_TextStream() {
if (m_pBuf)
FX_Free(m_pBuf);
}
void CFGAS_TextStream::InitStream() {
int32_t iPosition = m_pStreamImp->GetPosition();
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, 0);
m_pStreamImp->ReadData((uint8_t*)&m_dwBOM, 3);
#if _FX_ENDIAN_ == _FX_LITTLE_ENDIAN_
m_dwBOM &= 0x00FFFFFF;
if (m_dwBOM == 0x00BFBBEF) {
m_wBOMLength = 3;
m_wCodePage = FX_CODEPAGE_UTF8;
} else {
m_dwBOM &= 0x0000FFFF;
if (m_dwBOM == 0x0000FFFE) {
m_wBOMLength = 2;
m_wCodePage = FX_CODEPAGE_UTF16BE;
} else if (m_dwBOM == 0x0000FEFF) {
m_wBOMLength = 2;
m_wCodePage = FX_CODEPAGE_UTF16LE;
} else {
m_wBOMLength = 0;
m_dwBOM = 0;
m_wCodePage = FXSYS_GetACP();
}
}
#else
m_dwBOM &= 0xFFFFFF00;
if (m_dwBOM == 0xEFBBBF00) {
m_wBOMLength = 3;
m_wCodePage = FX_CODEPAGE_UTF8;
} else {
m_dwBOM &= 0xFFFF0000;
if (m_dwBOM == 0xFEFF0000) {
m_wBOMLength = 2;
m_wCodePage = FX_CODEPAGE_UTF16BE;
} else if (m_dwBOM == 0xFFFE0000) {
m_wBOMLength = 2;
m_wCodePage = FX_CODEPAGE_UTF16LE;
} else {
m_wBOMLength = 0;
m_dwBOM = 0;
m_wCodePage = FXSYS_GetACP();
}
}
#endif
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, std::max(m_wBOMLength, iPosition));
}
uint32_t CFGAS_TextStream::GetAccessModes() const {
return m_pStreamImp->GetAccessModes() | FX_STREAMACCESS_Text;
}
int32_t CFGAS_TextStream::GetLength() const {
return m_pStreamImp->GetLength();
}
int32_t CFGAS_TextStream::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
return m_pStreamImp->Seek(eSeek, iOffset);
}
int32_t CFGAS_TextStream::GetPosition() {
return m_pStreamImp->GetPosition();
}
bool CFGAS_TextStream::IsEOF() const {
return m_pStreamImp->IsEOF();
}
int32_t CFGAS_TextStream::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
return m_pStreamImp->ReadData(pBuffer, iBufferSize);
}
int32_t CFGAS_TextStream::WriteData(const uint8_t* pBuffer,
int32_t iBufferSize) {
return m_pStreamImp->WriteData(pBuffer, iBufferSize);
}
void CFGAS_TextStream::Flush() {
m_pStreamImp->Flush();
}
bool CFGAS_TextStream::SetLength(int32_t iLength) {
return m_pStreamImp->SetLength(iLength);
}
uint16_t CFGAS_TextStream::GetCodePage() const {
return m_wCodePage;
}
CFX_RetainPtr<IFGAS_Stream> CFGAS_TextStream::CreateSharedStream(
uint32_t dwAccess,
int32_t iOffset,
int32_t iLength) {
CFX_RetainPtr<IFGAS_Stream> pSR =
m_pStreamImp->CreateSharedStream(dwAccess, iOffset, iLength);
if (!pSR)
return nullptr;
if (dwAccess & FX_STREAMACCESS_Text)
return pdfium::MakeRetain<CFGAS_TextStream>(pSR);
return pSR;
}
int32_t CFGAS_TextStream::GetBOM(uint8_t bom[4]) const {
if (m_wBOMLength < 1)
return 0;
*(uint32_t*)bom = m_dwBOM;
return m_wBOMLength;
}
uint16_t CFGAS_TextStream::SetCodePage(uint16_t wCodePage) {
if (m_wBOMLength > 0)
return m_wCodePage;
uint16_t v = m_wCodePage;
m_wCodePage = wCodePage;
return v;
}
int32_t CFGAS_TextStream::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(pStr && iMaxLength > 0);
if (!m_pStreamImp) {
return -1;
}
int32_t iLen;
if (m_wCodePage == FX_CODEPAGE_UTF16LE ||
m_wCodePage == FX_CODEPAGE_UTF16BE) {
int32_t iBytes = iMaxLength * 2;
iLen = m_pStreamImp->ReadData((uint8_t*)pStr, iBytes);
iMaxLength = iLen / 2;
if (sizeof(FX_WCHAR) > 2) {
FX_UTF16ToWChar(pStr, iMaxLength);
}
#if _FX_ENDIAN_ == _FX_BIG_ENDIAN_
if (m_wCodePage == FX_CODEPAGE_UTF16LE) {
FX_SwapByteOrder(pStr, iMaxLength);
}
#else
if (m_wCodePage == FX_CODEPAGE_UTF16BE) {
FX_SwapByteOrder(pStr, iMaxLength);
}
#endif
} else {
int32_t pos = m_pStreamImp->GetPosition();
int32_t iBytes = iMaxLength;
iBytes = std::min(iBytes, m_pStreamImp->GetLength() - pos);
if (iBytes > 0) {
if (!m_pBuf) {
m_pBuf = FX_Alloc(uint8_t, iBytes);
m_iBufSize = iBytes;
} else if (iBytes > m_iBufSize) {
m_pBuf = FX_Realloc(uint8_t, m_pBuf, iBytes);
m_iBufSize = iBytes;
}
iLen = m_pStreamImp->ReadData(m_pBuf, iBytes);
int32_t iSrc = iLen;
int32_t iDecode = FX_DecodeString(m_wCodePage, (const FX_CHAR*)m_pBuf,
&iSrc, pStr, &iMaxLength, true);
m_pStreamImp->Seek(FX_STREAMSEEK_Current, iSrc - iLen);
if (iDecode < 1) {
return -1;
}
} else {
iMaxLength = 0;
}
}
bEOS = m_pStreamImp->IsEOF();
return iMaxLength;
}
int32_t CFGAS_TextStream::WriteString(const FX_WCHAR* pStr, int32_t iLength) {
ASSERT(pStr && iLength > 0);
if ((m_pStreamImp->GetAccessModes() & FX_STREAMACCESS_Write) == 0)
return -1;
if (m_wCodePage == FX_CODEPAGE_UTF8) {
int32_t len = iLength;
CFX_UTF8Encoder encoder;
while (len-- > 0) {
encoder.Input(*pStr++);
}
CFX_ByteStringC bsResult = encoder.GetResult();
m_pStreamImp->WriteData((const uint8_t*)bsResult.c_str(),
bsResult.GetLength());
}
return iLength;
}
CFGAS_Stream::CFGAS_Stream()
: m_eStreamType(FX_SREAMTYPE_Unknown),
m_pStreamImp(nullptr),
m_dwAccess(0),
m_iTotalSize(0),
m_iPosition(0),
m_iStart(0),
m_iLength(0),
m_iRefCount(1) {}
CFGAS_Stream::~CFGAS_Stream() {
if (m_eStreamType != FX_STREAMTYPE_Stream)
delete m_pStreamImp;
}
bool CFGAS_Stream::LoadFile(const FX_WCHAR* pszSrcFileName, uint32_t dwAccess) {
if (m_eStreamType != FX_SREAMTYPE_Unknown || m_pStreamImp)
return false;
if (!pszSrcFileName || FXSYS_wcslen(pszSrcFileName) < 1)
return false;
std::unique_ptr<CFGAS_FileStreamImp> pImp(new CFGAS_FileStreamImp());
if (!pImp->LoadFile(pszSrcFileName, dwAccess))
return false;
m_pStreamImp = pImp.release();
m_eStreamType = FX_STREAMTYPE_File;
m_dwAccess = dwAccess;
m_iLength = m_pStreamImp->GetLength();
return true;
}
bool CFGAS_Stream::LoadFileRead(
const CFX_RetainPtr<IFX_SeekableReadStream>& pFileRead,
uint32_t dwAccess) {
if (m_eStreamType != FX_SREAMTYPE_Unknown || m_pStreamImp)
return false;
if (!pFileRead)
return false;
std::unique_ptr<CFGAS_FileReadStreamImp> pImp(new CFGAS_FileReadStreamImp());
if (!pImp->LoadFileRead(pFileRead, dwAccess))
return false;
m_pStreamImp = pImp.release();
m_eStreamType = FX_STREAMTYPE_File;
m_dwAccess = dwAccess;
m_iLength = m_pStreamImp->GetLength();
return true;
}
bool CFGAS_Stream::LoadFileWrite(
const CFX_RetainPtr<IFX_SeekableWriteStream>& pFileWrite,
uint32_t dwAccess) {
if (m_eStreamType != FX_SREAMTYPE_Unknown || m_pStreamImp)
return false;
if (!pFileWrite)
return false;
auto pImp = pdfium::MakeUnique<CFGAS_FileWriteStreamImp>();
if (!pImp->LoadFileWrite(pFileWrite, dwAccess))
return false;
m_pStreamImp = pImp.release();
m_eStreamType = FX_STREAMTYPE_File;
m_dwAccess = dwAccess;
m_iLength = m_pStreamImp->GetLength();
return true;
}
bool CFGAS_Stream::LoadBuffer(uint8_t* pData,
int32_t iTotalSize,
uint32_t dwAccess) {
if (m_eStreamType != FX_SREAMTYPE_Unknown || m_pStreamImp)
return false;
if (!pData || iTotalSize < 1)
return false;
std::unique_ptr<CFGAS_BufferStreamImp> pImp(new CFGAS_BufferStreamImp());
if (!pImp->LoadBuffer(pData, iTotalSize, dwAccess))
return false;
m_pStreamImp = pImp.release();
m_eStreamType = FX_STREAMTYPE_Buffer;
m_dwAccess = dwAccess;
m_iLength = m_pStreamImp->GetLength();
return true;
}
bool CFGAS_Stream::LoadBufferRead(
const CFX_RetainPtr<IFX_BufferedReadStream>& pBufferRead,
int32_t iFileSize,
uint32_t dwAccess) {
if (m_eStreamType != FX_SREAMTYPE_Unknown || m_pStreamImp)
return false;
if (!pBufferRead)
return false;
auto pImp = pdfium::MakeUnique<CFGAS_BufferReadStreamImp>();
if (!pImp->LoadBufferRead(pBufferRead, iFileSize, dwAccess))
return false;
m_pStreamImp = pImp.release();
m_eStreamType = FX_STREAMTYPE_BufferRead;
m_dwAccess = dwAccess;
m_iLength = m_pStreamImp->GetLength();
return true;
}
uint32_t CFGAS_Stream::GetAccessModes() const {
return m_dwAccess;
}
int32_t CFGAS_Stream::GetLength() const {
if (!m_pStreamImp) {
return -1;
}
if (m_eStreamType == FX_STREAMTYPE_File ||
m_eStreamType == FX_STREAMTYPE_Buffer) {
return m_pStreamImp->GetLength();
}
return m_iLength;
}
int32_t CFGAS_Stream::Seek(FX_STREAMSEEK eSeek, int32_t iOffset) {
if (!m_pStreamImp) {
return -1;
}
if (m_eStreamType == FX_STREAMTYPE_File ||
m_eStreamType == FX_STREAMTYPE_Buffer) {
return m_iPosition = m_pStreamImp->Seek(eSeek, iOffset);
}
int32_t iEnd = m_iStart + m_iLength;
int32_t iPosition = m_iStart + iOffset;
if (eSeek == FX_STREAMSEEK_Begin) {
m_iPosition = iPosition;
} else if (eSeek == FX_STREAMSEEK_Current) {
m_iPosition += iOffset;
} else if (eSeek == FX_STREAMSEEK_End) {
m_iPosition = iEnd + iOffset;
}
if (m_iPosition > iEnd) {
m_iPosition = iEnd;
}
if (m_iPosition < m_iStart) {
m_iPosition = m_iStart;
}
return m_iPosition - m_iStart;
}
int32_t CFGAS_Stream::GetPosition() {
if (!m_pStreamImp) {
return -1;
}
if (m_eStreamType == FX_STREAMTYPE_File ||
m_eStreamType == FX_STREAMTYPE_Buffer) {
return m_iPosition = m_pStreamImp->GetPosition();
}
return m_iPosition - m_iStart;
}
bool CFGAS_Stream::IsEOF() const {
if (!m_pStreamImp) {
return true;
}
if (m_eStreamType == FX_STREAMTYPE_File ||
m_eStreamType == FX_STREAMTYPE_Buffer) {
return m_pStreamImp->IsEOF();
}
return m_iPosition >= m_iStart + m_iLength;
}
int32_t CFGAS_Stream::ReadData(uint8_t* pBuffer, int32_t iBufferSize) {
ASSERT(pBuffer && iBufferSize > 0);
if (!m_pStreamImp) {
return -1;
}
int32_t iLen = std::min(m_iStart + m_iLength - m_iPosition, iBufferSize);
if (iLen <= 0) {
return 0;
}
if (m_pStreamImp->GetPosition() != m_iPosition) {
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
}
iLen = m_pStreamImp->ReadData(pBuffer, iLen);
m_iPosition = m_pStreamImp->GetPosition();
return iLen;
}
int32_t CFGAS_Stream::ReadString(FX_WCHAR* pStr,
int32_t iMaxLength,
bool& bEOS) {
ASSERT(pStr && iMaxLength > 0);
if (!m_pStreamImp) {
return -1;
}
int32_t iEnd = m_iStart + m_iLength;
int32_t iLen = iEnd - m_iPosition;
iLen = std::min(iEnd / 2, iMaxLength);
if (iLen <= 0) {
return 0;
}
if (m_pStreamImp->GetPosition() != m_iPosition) {
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
}
iLen = m_pStreamImp->ReadString(pStr, iLen, bEOS);
m_iPosition = m_pStreamImp->GetPosition();
if (iLen > 0 && m_iPosition >= iEnd) {
bEOS = true;
}
return iLen;
}
int32_t CFGAS_Stream::WriteData(const uint8_t* pBuffer, int32_t iBufferSize) {
ASSERT(pBuffer && iBufferSize > 0);
if (!m_pStreamImp) {
return -1;
}
if ((m_dwAccess & FX_STREAMACCESS_Write) == 0) {
return -1;
}
int32_t iLen = iBufferSize;
if (m_eStreamType == FX_STREAMTYPE_Stream) {
iLen = std::min(m_iStart + m_iTotalSize - m_iPosition, iBufferSize);
if (iLen <= 0) {
return 0;
}
}
int32_t iEnd = m_iStart + m_iLength;
if (m_pStreamImp->GetPosition() != m_iPosition) {
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
}
iLen = m_pStreamImp->WriteData(pBuffer, iLen);
m_iPosition = m_pStreamImp->GetPosition();
if (m_iPosition > iEnd) {
m_iLength = m_iPosition - m_iStart;
}
return iLen;
}
int32_t CFGAS_Stream::WriteString(const FX_WCHAR* pStr, int32_t iLength) {
ASSERT(pStr && iLength > 0);
if (!m_pStreamImp) {
return -1;
}
if ((m_dwAccess & FX_STREAMACCESS_Write) == 0) {
return -1;
}
int32_t iLen = iLength;
if (m_eStreamType == FX_STREAMTYPE_Stream) {
iLen = std::min((m_iStart + m_iTotalSize - m_iPosition) / 2, iLength);
if (iLen <= 0) {
return 0;
}
}
int32_t iEnd = m_iStart + m_iLength;
if (m_pStreamImp->GetPosition() != m_iPosition) {
m_pStreamImp->Seek(FX_STREAMSEEK_Begin, m_iPosition);
}
iLen = m_pStreamImp->WriteString(pStr, iLen);
m_iPosition = m_pStreamImp->GetPosition();
if (m_iPosition > iEnd) {
m_iLength = m_iPosition - m_iStart;
}
return iLen;
}
void CFGAS_Stream::Flush() {
if (!m_pStreamImp) {
return;
}
if ((m_dwAccess & FX_STREAMACCESS_Write) == 0) {
return;
}
m_pStreamImp->Flush();
}
bool CFGAS_Stream::SetLength(int32_t iLength) {
if (!m_pStreamImp) {
return false;
}
if ((m_dwAccess & FX_STREAMACCESS_Write) == 0) {
return false;
}
return m_pStreamImp->SetLength(iLength);
}
int32_t CFGAS_Stream::GetBOM(uint8_t bom[4]) const {
if (!m_pStreamImp) {
return -1;
}
return 0;
}
uint16_t CFGAS_Stream::GetCodePage() const {
#if _FX_ENDIAN_ == _FX_LITTLE_ENDIAN_
return FX_CODEPAGE_UTF16LE;
#else
return FX_CODEPAGE_UTF16BE;
#endif
}
uint16_t CFGAS_Stream::SetCodePage(uint16_t wCodePage) {
#if _FX_ENDIAN_ == _FX_LITTLE_ENDIAN_
return FX_CODEPAGE_UTF16LE;
#else
return FX_CODEPAGE_UTF16BE;
#endif
}
CFX_RetainPtr<IFGAS_Stream> CFGAS_Stream::CreateSharedStream(uint32_t dwAccess,
int32_t iOffset,
int32_t iLength) {
ASSERT(iLength > 0);
if (!m_pStreamImp)
return nullptr;
if ((m_dwAccess & FX_STREAMACCESS_Text) != 0 &&
(dwAccess & FX_STREAMACCESS_Text) == 0) {
return nullptr;
}
if ((m_dwAccess & FX_STREAMACCESS_Write) == 0 &&
(dwAccess & FX_STREAMACCESS_Write) != 0) {
return nullptr;
}
int32_t iStart = m_iStart + iOffset;
int32_t iTotal = m_iStart + m_iLength;
if (iStart < m_iStart || iStart >= iTotal)
return nullptr;
int32_t iEnd = iStart + iLength;
if (iEnd < iStart || iEnd > iTotal)
return nullptr;
auto pShared = pdfium::MakeRetain<CFGAS_Stream>();
pShared->m_eStreamType = FX_STREAMTYPE_Stream;
pShared->m_pStreamImp = m_pStreamImp;
pShared->m_dwAccess = dwAccess;
pShared->m_iTotalSize = iLength;
pShared->m_iPosition = iStart;
pShared->m_iStart = iStart;
pShared->m_iLength = (dwAccess & FX_STREAMACCESS_Write) != 0 ? 0 : iLength;
if (dwAccess & FX_STREAMACCESS_Text)
return IFGAS_Stream::CreateTextStream(pShared);
return pShared;
}
CFX_RetainPtr<IFX_SeekableReadStream> IFGAS_Stream::MakeSeekableReadStream() {
return CFGAS_FileRead::Create(CFX_RetainPtr<IFGAS_Stream>(this));
}
CFX_RetainPtr<CFGAS_FileRead> CFGAS_FileRead::Create(
const CFX_RetainPtr<IFGAS_Stream>& pStream) {
return pdfium::MakeRetain<CFGAS_FileRead>(pStream);
}
CFGAS_FileRead::CFGAS_FileRead(const CFX_RetainPtr<IFGAS_Stream>& pStream)
: m_pStream(pStream) {
ASSERT(m_pStream);
}
CFGAS_FileRead::~CFGAS_FileRead() {}
FX_FILESIZE CFGAS_FileRead::GetSize() {
return (FX_FILESIZE)m_pStream->GetLength();
}
bool CFGAS_FileRead::ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) {
m_pStream->Seek(FX_STREAMSEEK_Begin, (int32_t)offset);
int32_t iLen = m_pStream->ReadData((uint8_t*)buffer, (int32_t)size);
return iLen == (int32_t)size;
}