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