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 }