| // OffsetStream.cpp |
| |
| #include "StdAfx.h" |
| |
| #include "OffsetStream.h" |
| |
| HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset) |
| { |
| _offset = offset; |
| _stream = stream; |
| return _stream->Seek((Int64)offset, STREAM_SEEK_SET, NULL); |
| } |
| |
| Z7_COM7F_IMF(COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)) |
| { |
| return _stream->Write(data, size, processedSize); |
| } |
| |
| Z7_COM7F_IMF(COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)) |
| { |
| if (seekOrigin == STREAM_SEEK_SET) |
| { |
| if (offset < 0) |
| return HRESULT_WIN32_ERROR_NEGATIVE_SEEK; |
| offset += _offset; |
| } |
| UInt64 absoluteNewPosition = 0; // =0 for gcc-10 |
| const HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition); |
| if (newPosition) |
| *newPosition = absoluteNewPosition - _offset; |
| return result; |
| } |
| |
| Z7_COM7F_IMF(COffsetOutStream::SetSize(UInt64 newSize)) |
| { |
| return _stream->SetSize(_offset + newSize); |
| } |