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/*
** Copyright (C) 2005-2011 Erik de Castro Lopo
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program 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. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
** A simple checksum for short, int and float data.
*/
#include "sfconfig.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <sndfile.h>
#include "regtest.h"
#define BIG_PRIME 999983
#define ARRAY_LEN(x) ((int) (sizeof (x)) / (sizeof ((x) [0])))
static int short_checksum (SNDFILE * file, int start) ;
static int int_checksum (SNDFILE * file, int start) ;
static int float_checksum (SNDFILE * file, int start) ;
int
calc_checksum (SNDFILE * file, const SF_INFO * info)
{ int start ;
/* Seed the checksum with data from the SF_INFO struct. */
start = info->samplerate ;
start = start * BIG_PRIME + info->channels ;
start = start * BIG_PRIME + info->format ;
switch (info->format & SF_FORMAT_SUBMASK)
{ case SF_FORMAT_FLOAT :
case SF_FORMAT_DOUBLE :
return float_checksum (file, start) ;
case SF_FORMAT_PCM_24 :
case SF_FORMAT_PCM_32 :
return int_checksum (file, start) ;
default :
return short_checksum (file, start) ;
} ;
return 0 ;
} /* calc_checksum */
/*------------------------------------------------------------------------------
*/
static union
{ short s [1 << 16] ;
int i [1 << 15] ;
float f [1 << 15] ;
} data ;
static int
short_checksum (SNDFILE * file, int start)
{ int k, count ;
do
{ count = (int) sf_read_short (file, data.s, ARRAY_LEN (data.s)) ;
for (k = 0 ; k < count ; k++)
start = start * BIG_PRIME + data.s [k] ;
}
while (count > 0) ;
return start ;
} /* short_checksum */
static int
int_checksum (SNDFILE * file, int start)
{ int k, count ;
do
{ count = (int) sf_read_int (file, data.i, ARRAY_LEN (data.i)) ;
for (k = 0 ; k < count ; k++)
start = start * BIG_PRIME + data.i [k] ;
}
while (count > 0) ;
return start ;
} /* int_checksum */
static int
float_checksum (SNDFILE * file, int start)
{ int k, count ;
do
{ count = (int) sf_read_float (file, data.f, ARRAY_LEN (data.f)) ;
for (k = 0 ; k < count ; k++)
start = start * BIG_PRIME + lrintf (0x7FFFFFFF * data.f [k]) ;
}
while (count > 0) ;
return start ;
} /* float_checksum */
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