google3/third_party/sevenzip/CPP/7zip/Archive/Common/InStreamWithCRC.cpp

// InStreamWithCRC.cpp

#include "StdAfx.h"

#include "InStreamWithCRC.h"

Z7_COM7F_IMF(CSequentialInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize))
{
  UInt32 realProcessed = 0;
  HRESULT result = S_OK;
  if (size != 0)
  {
    if (_stream)
      result = _stream->Read(data, size, &realProcessed);
    _size += realProcessed;
    if (realProcessed == 0)
      _wasFinished = true;
    else
      _crc = CrcUpdate(_crc, data, realProcessed);
  }
  if (processedSize)
    *processedSize = realProcessed;
  return result;
}

Z7_COM7F_IMF(CSequentialInStreamWithCRC::GetSize(UInt64 *size))
{
  *size = _fullSize;
  return S_OK;
}


Z7_COM7F_IMF(CInStreamWithCRC::Read(void *data, UInt32 size, UInt32 *processedSize))
{
  UInt32 realProcessed = 0;
  HRESULT result = S_OK;
  if (_stream)
    result = _stream->Read(data, size, &realProcessed);
  _size += realProcessed;
  /*
  if (size != 0 && realProcessed == 0)
    _wasFinished = true;
  */
  _crc = CrcUpdate(_crc, data, realProcessed);
  if (processedSize)
    *processedSize = realProcessed;
  return result;
}

Z7_COM7F_IMF(CInStreamWithCRC::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition))
{
  if (seekOrigin != STREAM_SEEK_SET || offset != 0)
    return E_FAIL;
  _size = 0;
  _crc = CRC_INIT_VAL;
  return _stream->Seek(offset, seekOrigin, newPosition);
}