1 files changed, 62 insertions, 0 deletions
diff --git a/src/hash.c b/src/hash.c
new file mode 100644
index 0000000..53a3542
--- /dev/null
+++ b/src/hash.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2007
+ *       pancake <pancake@youterm.com>
+ *
+ * 0xFFFF 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.
+ *
+ * 0xFFFF 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 0xFFFF; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include <stdio.h>
+#include "hash.h"
+
+usho do_hash(usho *b, int len)
+{
+	usho result = 0;
+	for(len>>=1;len--;b=b+1)
+		result^=b[0];
+	return result;
+}
+
+usho do_hash_file(char *filename)
+{
+	unsigned char buf[BSIZE];
+	FILE *fd = fopen(filename, "r");
+	usho hash = 0;
+	int ret;
+
+	if (fd == NULL) {
+		fprintf(stderr, "ERROR: File '%s' not found.\n", filename);
+		return -1;
+	}
+
+	do {	ret   = fread(&buf, 1, BSIZE, fd);
+		if (ret == -1)
+			return 0;
+		hash ^= do_hash((usho *)&buf, ret);
+	} while(ret);
+
+	fclose(fd);
+
+	return hash;
+}
+
+#if 0
+main()
+{
+	usho us = do_hash_file("zImage");
+	unsigned char *h= (unsigned char *)&us;
+	printf("%x %x\n",h[0],h[1]);
+}
+#endif