118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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** Copyright (C) 2005-2011 Erik de Castro Lopo
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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** A simple checksum for short, int and float data.
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*/
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#include "sfconfig.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <sndfile.h>
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#include "regtest.h"
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#define BIG_PRIME 999983
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#define ARRAY_LEN(x) ((int) (sizeof (x)) / (sizeof ((x) [0])))
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static int short_checksum (SNDFILE * file, int start) ;
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static int int_checksum (SNDFILE * file, int start) ;
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static int float_checksum (SNDFILE * file, int start) ;
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int
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calc_checksum (SNDFILE * file, const SF_INFO * info)
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{ int start ;
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/* Seed the checksum with data from the SF_INFO struct. */
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start = info->samplerate ;
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start = start * BIG_PRIME + info->channels ;
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start = start * BIG_PRIME + info->format ;
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switch (info->format & SF_FORMAT_SUBMASK)
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{ case SF_FORMAT_FLOAT :
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case SF_FORMAT_DOUBLE :
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return float_checksum (file, start) ;
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case SF_FORMAT_PCM_24 :
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case SF_FORMAT_PCM_32 :
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return int_checksum (file, start) ;
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default :
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return short_checksum (file, start) ;
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} ;
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return 0 ;
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} /* calc_checksum */
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/*------------------------------------------------------------------------------
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*/
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static union
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{ short s [1 << 16] ;
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int i [1 << 15] ;
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float f [1 << 15] ;
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} data ;
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static int
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short_checksum (SNDFILE * file, int start)
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{ int k, count ;
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do
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{ count = (int) sf_read_short (file, data.s, ARRAY_LEN (data.s)) ;
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for (k = 0 ; k < count ; k++)
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start = start * BIG_PRIME + data.s [k] ;
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}
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while (count > 0) ;
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return start ;
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} /* short_checksum */
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static int
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int_checksum (SNDFILE * file, int start)
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{ int k, count ;
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do
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{ count = (int) sf_read_int (file, data.i, ARRAY_LEN (data.i)) ;
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for (k = 0 ; k < count ; k++)
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start = start * BIG_PRIME + data.i [k] ;
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}
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while (count > 0) ;
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return start ;
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} /* int_checksum */
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static int
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float_checksum (SNDFILE * file, int start)
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{ int k, count ;
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do
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{ count = (int) sf_read_float (file, data.f, ARRAY_LEN (data.f)) ;
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for (k = 0 ; k < count ; k++)
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start = start * BIG_PRIME + lrintf (0x7FFFFFFF * data.f [k]) ;
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}
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while (count > 0) ;
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return start ;
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} /* float_checksum */
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