/home/master/UCL/VisualizationLibrary/src/vlCore/MD5CheckSum.cpp

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/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
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/*  Copyright (c) 2005-2010, Michele Bosi                                             */
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#include <vlCore/MD5CheckSum.hpp>
#include <vlCore/VirtualFile.hpp>
#include <cstdio>
#include <cstring>

#include "3rdparty/md5/md5.c"

using namespace vl;

std::string MD5CheckSum::toStdString() const
{
  char sum[33];
  sprintf ( sum, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", 
    mMD5[0], mMD5[1], mMD5[2],  mMD5[3],  mMD5[4],  mMD5[5],  mMD5[6],  mMD5[7],
    mMD5[8], mMD5[9], mMD5[10], mMD5[11], mMD5[12], mMD5[13], mMD5[14], mMD5[15] );
  return sum;
}
//-----------------------------------------------------------------------------
void MD5CheckSum::compute(void* buffer, int len)
{
  MD5Context md5context;
  MD5Init(&md5context);
  MD5Update(&md5context, (unsigned char*)buffer, len);
  MD5Final(mMD5,&md5context);
}
//-----------------------------------------------------------------------------
void MD5CheckSum::compute(VirtualFile* file)
{
  const int CHUNK_SIZE = 128*1024;
  std::vector<unsigned char> buffer;
  buffer.resize(CHUNK_SIZE);
  MD5Context md5context;
  MD5Init(&md5context);

  for( unsigned bytes_read = (unsigned)file->read(&buffer.front(), CHUNK_SIZE); 
       bytes_read; 
       bytes_read = (unsigned)file->read(&buffer.front(), CHUNK_SIZE) )
  {
    MD5Update(&md5context, &buffer.front(), bytes_read);
  }

  MD5Final(mMD5,&md5context);
}
//-----------------------------------------------------------------------------