Move compare.c to TOOLS, add it to the Makefile and document it.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@25830 b3059339-0415-0410-9bf9-f77b7e298cf2

3 files changed, 85 insertions, 0 deletions

diff --git a/TOOLS/Makefile b/TOOLS/Makefile
index e2d3a2cd35..747327d778 100644
--- a/TOOLS/Makefile
+++ b/TOOLS/Makefile
@@ -6,6 +6,7 @@ OBJS = alaw-gen$(EXESUF) \
 	asfinfo$(EXESUF) \
 	avi-fix$(EXESUF) \
 	avisubdump$(EXESUF) \
+	compare$(EXESUF) \
 	dump_mp4$(EXESUF) \
 	modify_reg$(EXESUF) \
 	movinfo$(EXESUF) \
diff --git a/TOOLS/README b/TOOLS/README
index 2d86017384..baf072ef26 100644
--- a/TOOLS/README
+++ b/TOOLS/README
@@ -519,6 +519,16 @@ Usage:        modify_reg -r <registry_file> -l
 Notes:        Necessary to use CoreAVC with MPlayer
 
 
+compare.c
+
+Author:       Michael Niedermayer
+
+Description:  Simple file compare program that detects the number of rounding
+              errors and dies if the error is too large.
+
+Usage:        compare <file1> <file2>
+
+
 realcodecs/
 
 Author:       miscellaneous
diff --git a/TOOLS/compare.c b/TOOLS/compare.c
new file mode 100644
index 0000000000..8230fa25a9
--- /dev/null
+++ b/TOOLS/compare.c
@@ -0,0 +1,74 @@
+/*
+ * Simple file compare program, it finds the number of rounding errors
+ * and dies if there is too large an error ( ABS(a-b)>1 ).
+ *
+ * copyright (c) 2001 Michael Niedermayer
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// FIXME: No checks but it is just for debugging so who cares ;)
+
+int main(int argc, char **argv)
+{
+	FILE *f0, *f1;
+	int dif=0;
+
+	if(argc!=3)
+	{
+		printf("compare <file1> <file2>\n");
+		exit(2);
+	}
+
+	f0= fopen(argv[1], "rb");
+	f1= fopen(argv[2], "rb");
+
+	for(;;)
+	{
+		short c0;
+		short c1;
+		int d;
+
+		int e0= fread(&c0, 2, 1, f0);
+		int e1= fread(&c1, 2, 1, f1);
+
+		d=c0-c1;
+		if(e0==0 && e1==0) break;
+		if(e0==0 || e1==0)
+		{
+			printf("FATAL error, files have different size!\n");
+			exit(1);
+		}
+
+		if(d<0) d=-d; // ABS
+		if(d>1)
+		{
+			printf("FATAL error, too large a difference found (%d)!\n", d);
+			exit(1);
+		}
+
+		if(d) dif++;
+	}
+
+	fclose(f0);
+	fclose(f1);
+
+	printf("%d (+/-1)differences found\n", dif);
+	exit(0);
+}
+