1 files changed, 112 insertions, 0 deletions
diff --git a/uuid.c b/uuid.c
new file mode 100644
index 0000000..94b5abd
--- /dev/null
+++ b/uuid.c
@@ -0,0 +1,112 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de>
+ *
+ *
+ *    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
+ *
+ *    Author: Neil Brown
+ *    Email: <neilb@suse.de>
+ */
+
+#include	<string.h>
+
+const int uuid_zero[4] = { 0, 0, 0, 0 };
+
+int same_uuid(int a[4], int b[4], int swapuuid)
+{
+	if (swapuuid) {
+		/* parse uuids are hostendian.
+		 * uuid's from some superblocks are big-ending
+		 * if there is a difference, we need to swap..
+		 */
+		unsigned char *ac = (unsigned char *)a;
+		unsigned char *bc = (unsigned char *)b;
+		int i;
+		for (i = 0; i < 16; i += 4) {
+			if (ac[i+0] != bc[i+3] ||
+			    ac[i+1] != bc[i+2] ||
+			    ac[i+2] != bc[i+1] ||
+			    ac[i+3] != bc[i+0])
+				return 0;
+		}
+		return 1;
+	} else {
+		if (a[0]==b[0] &&
+		    a[1]==b[1] &&
+		    a[2]==b[2] &&
+		    a[3]==b[3])
+			return 1;
+		return 0;
+	}
+}
+
+void copy_uuid(void *a, int b[4], int swapuuid)
+{
+	if (swapuuid) {
+		/* parse uuids are hostendian.
+		 * uuid's from some superblocks are big-ending
+		 * if there is a difference, we need to swap..
+		 */
+		unsigned char *ac = (unsigned char *)a;
+		unsigned char *bc = (unsigned char *)b;
+		int i;
+		for (i = 0; i < 16; i += 4) {
+			ac[i+0] = bc[i+3];
+			ac[i+1] = bc[i+2];
+			ac[i+2] = bc[i+1];
+			ac[i+3] = bc[i+0];
+		}
+	} else
+		memcpy(a, b, 16);
+}
+
+/*
+ * Parse a 128 bit uuid in 4 integers
+ * format is 32 hexx nibbles with options :.<space> separator
+ * If not exactly 32 hex digits are found, return 0
+ * else return 1
+ */
+int parse_uuid(char *str, int uuid[4])
+{
+	int hit = 0; /* number of Hex digIT */
+	int i;
+	char c;
+	for (i = 0; i < 4; i++)
+		uuid[i] = 0;
+
+	while ((c = *str++) != 0) {
+		int n;
+		if (c >= '0' && c <= '9')
+			n = c-'0';
+		else if (c >= 'a' && c <= 'f')
+			n = 10 + c - 'a';
+		else if (c >= 'A' && c <= 'F')
+			n = 10 + c - 'A';
+		else if (strchr(":. -", c))
+			continue;
+		else return 0;
+
+		if (hit<32) {
+			uuid[hit/8] <<= 4;
+			uuid[hit/8] += n;
+		}
+		hit++;
+	}
+	if (hit == 32)
+		return 1;
+	return 0;
+}