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// --------------------------------------------------------------------------
//
// File
// Name: BufferedWriteStream.cpp
// Purpose: Buffering write-only wrapper around IOStreams
// Created: 2010/09/13
//
// --------------------------------------------------------------------------
#include "Box.h"
#include "BufferedWriteStream.h"
#include "CommonException.h"
#include <string.h>
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::BufferedWriteStream(const char *, int, int)
// Purpose: Constructor, set up buffer
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
BufferedWriteStream::BufferedWriteStream(IOStream& rSink)
: mrSink(rSink), mBufferPosition(0)
{ }
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::Read(void *, int)
// Purpose: Reads bytes from the file - throws exception
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
int BufferedWriteStream::Read(void *pBuffer, int NBytes, int Timeout)
{
THROW_EXCEPTION(CommonException, NotSupported);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::BytesLeftToRead()
// Purpose: Returns number of bytes to read (may not be most efficient function ever)
// Created: 2007/01/16
//
// --------------------------------------------------------------------------
IOStream::pos_type BufferedWriteStream::BytesLeftToRead()
{
THROW_EXCEPTION(CommonException, NotSupported);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::Write(void *, int)
// Purpose: Writes bytes to the underlying stream (not supported)
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void BufferedWriteStream::Write(const void *pBuffer, int NBytes, int Timeout)
{
int numBytesRemain = NBytes;
do
{
int maxWritable = sizeof(mBuffer) - mBufferPosition;
int numBytesToWrite = (numBytesRemain < maxWritable) ?
numBytesRemain : maxWritable;
if(numBytesToWrite > 0)
{
memcpy(mBuffer + mBufferPosition, pBuffer,
numBytesToWrite);
mBufferPosition += numBytesToWrite;
pBuffer = ((const char *)pBuffer) + numBytesToWrite;
numBytesRemain -= numBytesToWrite;
}
if(numBytesRemain > 0)
{
Flush();
}
}
while(numBytesRemain > 0);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::GetPosition()
// Purpose: Get position in stream
// Created: 2003/08/21
//
// --------------------------------------------------------------------------
IOStream::pos_type BufferedWriteStream::GetPosition() const
{
return mrSink.GetPosition() + mBufferPosition;
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::Seek(pos_type, int)
// Purpose: Seeks within file, as lseek, invalidate buffer
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void BufferedWriteStream::Seek(IOStream::pos_type Offset, int SeekType)
{
// Always flush the buffer before seeking
Flush();
mrSink.Seek(Offset, SeekType);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::Flush();
// Purpose: Write out current buffer contents and invalidate
// Created: 2010/09/13
//
// --------------------------------------------------------------------------
void BufferedWriteStream::Flush(int Timeout)
{
if(mBufferPosition > 0)
{
mrSink.Write(mBuffer, mBufferPosition);
}
mBufferPosition = 0;
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::Close()
// Purpose: Closes the underlying stream (not needed)
// Created: 2003/07/31
//
// --------------------------------------------------------------------------
void BufferedWriteStream::Close()
{
Flush();
mrSink.Close();
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::StreamDataLeft()
// Purpose: Any data left to write?
// Created: 2003/08/02
//
// --------------------------------------------------------------------------
bool BufferedWriteStream::StreamDataLeft()
{
THROW_EXCEPTION(CommonException, NotSupported);
}
// --------------------------------------------------------------------------
//
// Function
// Name: BufferedWriteStream::StreamClosed()
// Purpose: Is the stream closed?
// Created: 2003/08/02
//
// --------------------------------------------------------------------------
bool BufferedWriteStream::StreamClosed()
{
return mrSink.StreamClosed();
}
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