fc_test.cpp

对浮点型数据进行压缩

/*
===============================================================================

  FILE:  fc_test.cpp
  
  CONTENTS:
  
    A small program that tests the floating point compressor.
  
  PROGRAMMERS:
  
    martin [e-mail]
  
  COPYRIGHT:
  
    copyright (C) 2003  martin [e-mail]
    
    This software is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  
  CHANGE HISTORY:
  
    23 June 2004 -- created after finishing the paper with Ajith
  
===============================================================================
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "floatcompressorold.h"
#include "floatcompressornew.h"
#include "rangemodel.h"
#include "rangeencoder.h"

int main(int   argc, char  *argv[])
{
  unsigned y, size_y = 5000;
  unsigned x, size_x = 1025;

  FloatCompressorOld *fc_old = new FloatCompressorOld();
  FloatCompressorNew *fc_new = new FloatCompressorNew();

  // old coder

	printf("starting old compression ...\n");
  fc_old->SetupCompressor(0); 
  // zero instead of rangeencoder pointer will then use internally separate rangencoder for sign, exponent, and mantissa 
  fc_old->CompressAcross(-0.89f, -1.01f);
  for (y = 0; y != size_y; y++)
    for (x = 0; x != size_x; x++)
    {
      fc_old->CompressAcross(0.0f, 0.0f);
    }
  fc_old->FinishCompressor();
	printf("done.\n");
  fprintf(stderr, "SIGN %8.6f EXPO %8.6f MANT %5.3f TOTAL %5.3f\n",
	  8.0f*fc_old->GetSignBytes()/(size_y*size_x),8.0f*fc_old->GetExponentBytes()/(size_y*size_x),
	  8.0f*fc_old->GetMantissaBytes()/(size_y*size_x),8.0f*fc_old->GetTotalBytes()/(size_y*size_x)); 

	printf("starting old decompression ...\n");
  fc_old->SetupDecompressor(0);  // zero instead of rangeencoder pointer will then use internally separate rangencoder for sign, exponent, and mantissa 
  if (fc_old->DecompressAcross(-0.89f) != -1.01f) {printf("error1\n"); exit(1);}
  for (y = 0; y != size_y; y++)
    for (x = 0; x != size_x; x++)
    {
      if (fc_old->DecompressAcross(0.0f) != 0.0f) {printf("error2\n"); exit(1);}
    }
  fc_old->FinishDecompressor();
	printf("done.\n");

  // new coder

	printf("starting new compression ...\n");
  fc_new->SetupCompressor(0); // zero instead of rangeencoder pointer will then use internally separate rangencoder for signexponent, and mantissa  
  fc_new->CompressAcross(-0.89f, -1.01f);
  for (y = 0; y != size_y; y++)
    for (x = 0; x != size_x; x++)
    {
      fc_new->CompressAcross(0.0f, 0.0f);
    }
  fc_new->FinishCompressor();
	printf("done.\n");
  fprintf(stderr, "SIGNEXPO %8.6f           MANT %5.3f TOTAL %5.3f      MANT(%5.3f,%5.3f,%5.3f)\n",
	  8.0f*fc_new->GetSignExponentBytes()/(size_y*size_x),8.0f*fc_new->GetMantissaBytes()/(size_y*size_x),
	  8.0f*fc_new->GetTotalBytes()/(size_y*size_x),8.0f*fc_new->GetMantissaBytes(0)/(size_y*size_x),
	  8.0f*fc_new->GetMantissaBytes(1)/(size_y*size_x),8.0f*fc_new->GetMantissaBytes(2)/(size_y*size_x)); 

	printf("starting new decompression ...\n");
  fc_new->SetupDecompressor(0); // zero instead of rangeencoder pointer will then use internally separate rangencoder for signexponent, and mantissa  
  if (fc_new->DecompressAcross(-0.89f) != -1.01f) {printf("error1\n"); exit(1);}
  for (y = 0; y != size_y; y++)
    for (x = 0; x != size_x; x++)
    {
      if (fc_new->DecompressAcross(0.0f) != 0.0f) {printf("error2\n"); exit(1);}
    }
  fc_new->FinishDecompressor();
	printf("done.\n");

  return 0;
}