diff src/libsndfile-1.0.25/regtest/checksum.c @ 85:545efbb81310

Import initial set of sources

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libsndfile-1.0.25/regtest/checksum.c	Mon Mar 18 14:12:14 2013 +0000
@@ -0,0 +1,117 @@
+/*
+**	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 */
+