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view src/win32/7zip/7z/CPP/7zip/Archive/Common/InStreamWithCRC.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 // InStreamWithCRC.cpp



     2 



     3 #include "StdAfx.h"



     4 



     5 #include "InStreamWithCRC.h"



     6 



     7 STDMETHODIMP CSequentialInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize)



     8 {



     9   UInt32 realProcessedSize;



    10   HRESULT result = _stream->Read(data, size, &realProcessedSize);



    11   _size += realProcessedSize;



    12   if (size > 0 && realProcessedSize == 0)



    13     _wasFinished = true;



    14   _crc = CrcUpdate(_crc, data, realProcessedSize);



    15   if(processedSize != NULL)



    16     *processedSize = realProcessedSize;



    17   return result;



    18 }



    19 



    20 STDMETHODIMP CInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize)



    21 {



    22   UInt32 realProcessedSize;



    23   HRESULT result = _stream->Read(data, size, &realProcessedSize);



    24   if (size > 0 && realProcessedSize == 0)



    25     _wasFinished = true;



    26   _size += realProcessedSize;



    27   _crc = CrcUpdate(_crc, data, realProcessedSize);



    28   if(processedSize != NULL)



    29     *processedSize = realProcessedSize;



    30   return result;



    31 }



    32 



    33 STDMETHODIMP CInStreamWithCRC::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)



    34 {



    35   if (seekOrigin != STREAM_SEEK_SET || offset != 0)



    36     return E_FAIL;



    37   _size = 0;



    38   _crc = CRC_INIT_VAL;



    39   return _stream->Seek(offset, seekOrigin, newPosition);



    40 }