1 // OffsetStream.cpp
2
3 #include "StdAfx.h"
4
5 #include "OffsetStream.h"
6
Init(IOutStream * stream,UInt64 offset)7 HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
8 {
9 _offset = offset;
10 _stream = stream;
11 return _stream->Seek((Int64)offset, STREAM_SEEK_SET, NULL);
12 }
13
Z7_COM7F_IMF(COffsetOutStream::Write (const void * data,UInt32 size,UInt32 * processedSize))14 Z7_COM7F_IMF(COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize))
15 {
16 return _stream->Write(data, size, processedSize);
17 }
18
Z7_COM7F_IMF(COffsetOutStream::Seek (Int64 offset,UInt32 seekOrigin,UInt64 * newPosition))19 Z7_COM7F_IMF(COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition))
20 {
21 if (seekOrigin == STREAM_SEEK_SET)
22 {
23 if (offset < 0)
24 return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
25 offset += _offset;
26 }
27 UInt64 absoluteNewPosition = 0; // =0 for gcc-10
28 const HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
29 if (newPosition)
30 *newPosition = absoluteNewPosition - _offset;
31 return result;
32 }
33
Z7_COM7F_IMF(COffsetOutStream::SetSize (UInt64 newSize))34 Z7_COM7F_IMF(COffsetOutStream::SetSize(UInt64 newSize))
35 {
36 return _stream->SetSize(_offset + newSize);
37 }
38