1// OffsetStream.cpp 2 3#include "StdAfx.h" 4 5#include "Common/Defs.h" 6#include "OffsetStream.h" 7 8HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset) 9{ 10 _offset = offset; 11 _stream = stream; 12 return _stream->Seek(offset, STREAM_SEEK_SET, NULL); 13} 14 15STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize) 16{ 17 return _stream->Write(data, size, processedSize); 18} 19 20STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin, 21 UInt64 *newPosition) 22{ 23 UInt64 absoluteNewPosition; 24 if (seekOrigin == STREAM_SEEK_SET) 25 offset += _offset; 26 HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition); 27 if (newPosition != NULL) 28 *newPosition = absoluteNewPosition - _offset; 29 return result; 30} 31 32STDMETHODIMP COffsetOutStream::SetSize(UInt64 newSize) 33{ 34 return _stream->SetSize(_offset + newSize); 35} 36