/
InOutTempBuffer.cpp
122 lines (107 loc) · 2.79 KB
/
InOutTempBuffer.cpp
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// InOutTempBuffer.cpp
#include "StdAfx.h"
#include "InOutTempBuffer.h"
#include "../../Common/Defs.h"
// #include "Windows/Defs.h"
#include "StreamUtils.h"
using namespace NWindows;
using namespace NFile;
using namespace NDirectory;
static UInt32 kTmpBufferMemorySize = (1 << 20);
static LPCTSTR kTempFilePrefixString = TEXT("iot");
CInOutTempBuffer::CInOutTempBuffer():
_buffer(NULL)
{
}
void CInOutTempBuffer::Create()
{
_buffer = new Byte[kTmpBufferMemorySize];
}
CInOutTempBuffer::~CInOutTempBuffer()
{
delete []_buffer;
}
void CInOutTempBuffer::InitWriting()
{
_bufferPosition = 0;
_tmpFileCreated = false;
_fileSize = 0;
}
bool CInOutTempBuffer::WriteToFile(const void *data, UInt32 size)
{
if (size == 0)
return true;
if(!_tmpFileCreated)
{
CSysString tempDirPath;
if(!MyGetTempPath(tempDirPath))
return false;
if (_tempFile.Create(tempDirPath, kTempFilePrefixString, _tmpFileName) == 0)
return false;
// _outFile.SetOpenCreationDispositionCreateAlways();
if(!_outFile.Create(_tmpFileName, true))
return false;
_tmpFileCreated = true;
}
UInt32 processedSize;
if(!_outFile.Write(data, size, processedSize))
return false;
_fileSize += processedSize;
return (processedSize == size);
}
bool CInOutTempBuffer::FlushWrite()
{
return _outFile.Close();
}
bool CInOutTempBuffer::Write(const void *data, UInt32 size)
{
if(_bufferPosition < kTmpBufferMemorySize)
{
UInt32 curSize = MyMin(kTmpBufferMemorySize - _bufferPosition, size);
memmove(_buffer + _bufferPosition, (const Byte *)data, curSize);
_bufferPosition += curSize;
size -= curSize;
data = ((const Byte *)data) + curSize;
_fileSize += curSize;
}
return WriteToFile(data, size);
}
bool CInOutTempBuffer::InitReading()
{
_currentPositionInBuffer = 0;
if(_tmpFileCreated)
return _inFile.Open(_tmpFileName);
return true;
}
HRESULT CInOutTempBuffer::WriteToStream(ISequentialOutStream *stream)
{
if (_currentPositionInBuffer < _bufferPosition)
{
UInt32 sizeToWrite = _bufferPosition - _currentPositionInBuffer;
RINOK(WriteStream(stream, _buffer + _currentPositionInBuffer, sizeToWrite, NULL));
_currentPositionInBuffer += sizeToWrite;
}
if (!_tmpFileCreated)
return true;
for (;;)
{
UInt32 localProcessedSize;
if (!_inFile.ReadPart(_buffer, kTmpBufferMemorySize, localProcessedSize))
return E_FAIL;
if (localProcessedSize == 0)
return S_OK;
RINOK(WriteStream(stream, _buffer, localProcessedSize, NULL));
}
}
STDMETHODIMP CSequentialOutTempBufferImp::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
if (!_buffer->Write(data, size))
{
if (processedSize != NULL)
*processedSize = 0;
return E_FAIL;
}
if (processedSize != NULL)
*processedSize = size;
return S_OK;
}