tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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OffsetStream.cpp (982B)

      1 // OffsetStream.cpp
      2 
      3 #include "StdAfx.h"
      4 
      5 #include "../../Common/Defs.h"
      6 
      7 #include "OffsetStream.h"
      8 
      9 HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
     10 {
     11  _offset = offset;
     12  _stream = stream;
     13  return _stream->Seek(offset, STREAM_SEEK_SET, NULL);
     14 }
     15 
     16 STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
     17 {
     18  return _stream->Write(data, size, processedSize);
     19 }
     20 
     21 STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
     22 {
     23  UInt64 absoluteNewPosition;
     24  if (seekOrigin == STREAM_SEEK_SET)
     25  {
     26    if (offset < 0)
     27      return HRESULT_WIN32_ERROR_NEGATIVE_SEEK;
     28    offset += _offset;
     29  }
     30  HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
     31  if (newPosition)
     32    *newPosition = absoluteNewPosition - _offset;
     33  return result;
     34 }
     35 
     36 STDMETHODIMP COffsetOutStream::SetSize(UInt64 newSize)
     37 {
     38  return _stream->SetSize(_offset + newSize);
     39 }