1// OffsetStream.cpp 2 3#include "StdAfx.h" 4 5#include "OffsetStream.h" 6 7HRESULT 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 14Z7_COM7F_IMF(COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)) 15{ 16 return _stream->Write(data, size, processedSize); 17} 18 19Z7_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 34Z7_COM7F_IMF(COffsetOutStream::SetSize(UInt64 newSize)) 35{ 36 return _stream->SetSize(_offset + newSize); 37} 38