Import ccache-2.4 source

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10900 626c5289-ae23-0410-ae9c-e8d60b6d4f22

CCache/hash.c

@@ -0,0 +1,80 @@
+/*
+   Copyright (C) Andrew Tridgell 2002
+   
+   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.
+*/
+/*
+  simple front-end functions to mdfour code
+*/
+
+#include "ccache.h"
+
+static struct mdfour md;
+
+void hash_buffer(const char *s, int len)
+{
+	mdfour_update(&md, (unsigned char *)s, len);
+}
+
+void hash_start(void)
+{
+	mdfour_begin(&md);
+}
+
+void hash_string(const char *s)
+{
+	hash_buffer(s, strlen(s));
+}
+
+void hash_int(int x)
+{
+	hash_buffer((char *)&x, sizeof(x));
+}
+
+/* add contents of a file to the hash */
+void hash_file(const char *fname)
+{
+	char buf[1024];
+	int fd, n;
+
+	fd = open(fname, O_RDONLY|O_BINARY);
+	if (fd == -1) {
+		cc_log("Failed to open %s\n", fname);
+		fatal("hash_file");
+	}
+
+	while ((n = read(fd, buf, sizeof(buf))) > 0) {
+		hash_buffer(buf, n);
+	}
+	close(fd);
+}
+
+/* return the hash result as a static string */
+char *hash_result(void)
+{
+	unsigned char sum[16];
+	static char ret[53];
+	int i;
+
+	hash_buffer(NULL, 0);
+	mdfour_result(&md, sum);
+	
+	for (i=0;i<16;i++) {
+		sprintf(&ret[i*2], "%02x", (unsigned)sum[i]);
+	}
+	sprintf(&ret[i*2], "-%u", (unsigned)md.totalN);
+
+	return ret;
+}