// 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); }