1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/win32/7zip/7z/CPP/7zip/Common/OffsetStream.cpp	Sat Mar 03 10:31:27 2012 -0600
     1.3 @@ -0,0 +1,35 @@
     1.4 +// OffsetStream.cpp
     1.5 +
     1.6 +#include "StdAfx.h"
     1.7 +
     1.8 +#include "Common/Defs.h"
     1.9 +#include "OffsetStream.h"
    1.10 +
    1.11 +HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)
    1.12 +{
    1.13 +  _offset = offset;
    1.14 +  _stream = stream;
    1.15 +  return _stream->Seek(offset, STREAM_SEEK_SET, NULL);
    1.16 +}
    1.17 +
    1.18 +STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
    1.19 +{
    1.20 +  return _stream->Write(data, size, processedSize);
    1.21 +}
    1.22 +
    1.23 +STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin,
    1.24 +    UInt64 *newPosition)
    1.25 +{
    1.26 +  UInt64 absoluteNewPosition;
    1.27 +  if (seekOrigin == STREAM_SEEK_SET)
    1.28 +    offset += _offset;
    1.29 +  HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);
    1.30 +  if (newPosition != NULL)
    1.31 +    *newPosition = absoluteNewPosition - _offset;
    1.32 +  return result;
    1.33 +}
    1.34 +
    1.35 +STDMETHODIMP COffsetOutStream::SetSize(Int64 newSize)
    1.36 +{
    1.37 +  return _stream->SetSize(_offset + newSize);
    1.38 +}