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view src/win32/7zip/7z/CPP/7zip/Common/OffsetStream.cpp @ 1:f9f4f1b99eed

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importing src directory
author Robert McIntyre <rlm@mit.edu>
date Sat, 03 Mar 2012 10:31:27 -0600
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     1 // OffsetStream.cpp



     2 



     3 #include "StdAfx.h"



     4 



     5 #include "Common/Defs.h"



     6 #include "OffsetStream.h"



     7 



     8 HRESULT COffsetOutStream::Init(IOutStream *stream, UInt64 offset)



     9 {



    10   _offset = offset;



    11   _stream = stream;



    12   return _stream->Seek(offset, STREAM_SEEK_SET, NULL);



    13 }



    14 



    15 STDMETHODIMP COffsetOutStream::Write(const void *data, UInt32 size, UInt32 *processedSize)



    16 {



    17   return _stream->Write(data, size, processedSize);



    18 }



    19 



    20 STDMETHODIMP COffsetOutStream::Seek(Int64 offset, UInt32 seekOrigin,



    21     UInt64 *newPosition)



    22 {



    23   UInt64 absoluteNewPosition;



    24   if (seekOrigin == STREAM_SEEK_SET)



    25     offset += _offset;



    26   HRESULT result = _stream->Seek(offset, seekOrigin, &absoluteNewPosition);



    27   if (newPosition != NULL)



    28     *newPosition = absoluteNewPosition - _offset;



    29   return result;



    30 }



    31 



    32 STDMETHODIMP COffsetOutStream::SetSize(Int64 newSize)



    33 {



    34   return _stream->SetSize(_offset + newSize);



    35 }