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// OffsetStream.cpp
#include "StdAfx.h"
#include "Common/Defs.h"
#include "OffsetStream.h"
HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
{
_offset = offset;
_stream = stream;
return _stream->Seek(offset, STREAM_SEEK_SET, NULL);
}
STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
{
return _stream->Write(data, size, processedSize);
}
STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin,
UInt64 *newPosition)
{
UInt64 absoluteNewPosition;
if (seekOrigin == STREAM_SEEK_SET)
offset += _offset;
HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
if (newPosition != NULL)
*newPosition = absoluteNewPosition - _offset;
return result;
}
STDMETHODIMP COffsetOutStream::SetSize(Int64 newSize)
{
return _stream->SetSize(_offset + newSize);
}
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