rlm@1: // OffsetStream.cpp
rlm@1: 
rlm@1: #include "StdAfx.h"
rlm@1: 
rlm@1: #include "Common/Defs.h"
rlm@1: #include "OffsetStream.h"
rlm@1: 
rlm@1: HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
rlm@1: {
rlm@1:   _offset = offset;
rlm@1:   _stream = stream;
rlm@1:   return _stream->Seek(offset, STREAM_SEEK_SET, NULL);
rlm@1: }
rlm@1: 
rlm@1: STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
rlm@1: {
rlm@1:   return _stream->Write(data, size, processedSize);
rlm@1: }
rlm@1: 
rlm@1: STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin,
rlm@1:     UInt64 *newPosition)
rlm@1: {
rlm@1:   UInt64 absoluteNewPosition;
rlm@1:   if (seekOrigin == STREAM_SEEK_SET)
rlm@1:     offset += _offset;
rlm@1:   HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
rlm@1:   if (newPosition != NULL)
rlm@1:     *newPosition = absoluteNewPosition - _offset;
rlm@1:   return result;
rlm@1: }
rlm@1: 
rlm@1: STDMETHODIMP COffsetOutStream::SetSize(Int64 newSize)
rlm@1: {
rlm@1:   return _stream->SetSize(_offset + newSize);
rlm@1: }