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// StreamObjects.cpp
#include "StdAfx.h"
#include "StreamObjects.h"
STDMETHODIMP CBufInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
{
if (processedSize != NULL)
*processedSize = 0;
if (_pos > _size)
return E_FAIL;
size_t rem = _size - (size_t)_pos;
if (size < rem)
rem = (size_t)size;
memcpy(data, _data + (size_t)_pos, rem);
_pos += rem;
if (processedSize != NULL)
*processedSize = (UInt32)rem;
return S_OK;
}
STDMETHODIMP CBufInStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
{
switch(seekOrigin)
{
case STREAM_SEEK_SET: _pos = offset; break;
case STREAM_SEEK_CUR: _pos += offset; break;
case STREAM_SEEK_END: _pos = _size + offset; break;
default: return STG_E_INVALIDFUNCTION;
}
if (newPosition)
*newPosition = _pos;
return S_OK;
}
void CWriteBuffer::Write(const void *data, size_t size)
{
size_t newCapacity = _size + size;
_buffer.EnsureCapacity(newCapacity);
memcpy(_buffer + _size, data, size);
_size += size;
}
STDMETHODIMP CSequentialOutStreamImp::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
_writeBuffer.Write(data, (size_t)size);
if(processedSize != NULL)
*processedSize = size;
return S_OK;
}
STDMETHODIMP CSequentialOutStreamImp2::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
size_t rem = _size - _pos;
if (size < rem)
rem = (size_t)size;
memcpy(_buffer + _pos, data, rem);
_pos += rem;
if (processedSize != NULL)
*processedSize = (UInt32)rem;
return (rem == size ? S_OK : E_FAIL);
}
STDMETHODIMP CSequentialInStreamSizeCount::Read(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize;
HRESULT result = _stream->Read(data, size, &realProcessedSize);
_size += realProcessedSize;
if (processedSize != 0)
*processedSize = realProcessedSize;
return result;
}
STDMETHODIMP CSequentialOutStreamSizeCount::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize;
HRESULT result = _stream->Write(data, size, &realProcessedSize);
_size += realProcessedSize;
if (processedSize != 0)
*processedSize = realProcessedSize;
return result;
}
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