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