Add a test to validate that FLAC__MD5Final clears the MD5Context.

Closes: https://sourceforge.net/p/flac/bugs/407/

src/test_libFLAC/Makefile.am

@@ -45,10 +45,12 @@ test_libFLAC_SOURCES = \
 	metadata.c \
 	metadata_manip.c \
 	metadata_object.c \
+	md5.c \
 	bitwriter.h \
 	decoders.h \
 	encoders.h \
 	format.h \
-	metadata.h
+	metadata.h \
+	md5.h
 
 CLEANFILES = test_libFLAC.exe

src/test_libFLAC/main.c

@@ -26,10 +26,12 @@
 #include "encoders.h"
 #include "format.h"
 #include "metadata.h"
+#include "md5.h"
 
-int main(int argc, char *argv[])
+int main(void)
 {
-	(void)argc, (void)argv;
+	if(!test_md5())
+		return 1;
 
 	if(!test_bitwriter())
 		return 1;

src/test_libFLAC/md5.c

@@ -0,0 +1,61 @@
+/* test_libFLAC - Unit tester for libFLAC
+ * Copyright (C) 2014  Xiph.Org Foundation
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#if HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+
+#include "FLAC/assert.h"
+#include "share/compat.h"
+#include "private/md5.h"
+#include "md5.h"
+
+
+FLAC__bool test_md5(void)
+{
+	FLAC__MD5Context ctx;
+	FLAC__byte digest[16];
+	unsigned k ;
+	char * cptr;
+
+	printf("\n+++ libFLAC unit test: md5\n\n");
+
+	printf("testing FLAC__MD5Init ... ");
+	FLAC__MD5Init (&ctx);
+	if (ctx.buf[0] != 0x67452301) {
+		printf("FAILED!\n");
+		return false;
+	}
+	printf("OK\n");
+
+	printf("testing that FLAC__MD5Final clears the MD5Context ... ");
+	FLAC__MD5Final(digest, &ctx);
+	cptr = (char*) &ctx ;
+	for (k = 0 ; k < sizeof (ctx) ; k++) {
+		if (cptr [k]) {
+			printf("FAILED, MD5 ctx has not been cleared after FLAC__MD5Final\n");
+			return false;
+		}
+	}
+	printf("OK\n");
+
+	printf("\nPASSED!\n");
+	return true;
+}

src/test_libFLAC/md5.h

@@ -0,0 +1,26 @@
+/* test_libFLAC - Unit tester for libFLAC
+ * Copyright (C) 2014  Xiph.Org Foundation
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef FLAC__TEST_LIBFLAC_MD5_H
+#define FLAC__TEST_LIBFLAC_MD5_H
+
+#include "FLAC/ordinals.h"
+
+FLAC__bool test_md5(void);
+
+#endif