lib: add uuid_str_to_bin for use with bootp and PXE uuid

Signed-off-by: Jason Hobbs <jason.hobbs@calxeda.com>

diff --git a/include/common.h b/include/common.h
index f9fea08115fe5167c44c24f4a5599e065d456e5c..7950c8bdede18a3f1ace6c53031e2948d2cba20e 100644 (file)
--- a/include/common.h
+++ b/include/common.h
@@ -694,6 +694,10 @@ int strcmp_compar(const void *, const void *);
 /* lib/time.c */
 void   udelay        (unsigned long);
 
+/* lib/uuid.c */
+void uuid_str_to_bin(const char *uuid, unsigned char *out);
+int uuid_str_valid(const char *uuid);
+
 /* lib/vsprintf.c */
 ulong  simple_strtoul(const char *cp,char **endp,unsigned int base);
 int strict_strtoul(const char *cp, unsigned int base, unsigned long *res);

diff --git a/lib/Makefile b/lib/Makefile
index 884f64c00aeb9518dc664b315e5c15ce2351f9c8..075bb8c28440f4297c1a4bda125f945640fb4c09 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -55,6 +55,7 @@ COBJS-y += ctype.o
 COBJS-y += div64.o
 COBJS-y += string.o
 COBJS-y += time.o
+COBJS-$(CONFIG_BOOTP_PXE) += uuid.o
 COBJS-y += vsprintf.o
 
 COBJS  := $(COBJS-y)

diff --git a/lib/uuid.c b/lib/uuid.c
new file mode 100644 (file)
index 0000000..10b022f
--- /dev/null
+++ b/lib/uuid.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2011 Calxeda, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 <linux/ctype.h>
+#include "common.h"
+
+/*
+ * This is what a UUID string looks like.
+ *
+ * x is a hexadecimal character. fields are separated by '-'s. When converting
+ * to a binary UUID, le means the field should be converted to little endian,
+ * and be means it should be converted to big endian.
+ *
+ * 0        9    14   19   24
+ * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+ *    le     le   le   be       be
+ */
+
+int uuid_str_valid(const char *uuid)
+{
+       int i, valid;
+
+       if (uuid == NULL)
+               return 0;
+
+       for (i = 0, valid = 1; uuid[i] && valid; i++) {
+               switch (i) {
+               case 8: case 13: case 18: case 23:
+                       valid = (uuid[i] == '-');
+                       break;
+               default:
+                       valid = isxdigit(uuid[i]);
+                       break;
+               }
+       }
+
+       if (i != 36 || !valid)
+               return 0;
+
+       return 1;
+}
+
+void uuid_str_to_bin(const char *uuid, unsigned char *out)
+{
+       uint16_t tmp16;
+       uint32_t tmp32;
+       uint64_t tmp64;
+
+       if (!uuid || !out)
+               return;
+
+       tmp32 = cpu_to_le32(simple_strtoul(uuid, NULL, 16));
+       memcpy(out, &tmp32, 4);
+
+       tmp16 = cpu_to_le16(simple_strtoul(uuid + 9, NULL, 16));
+       memcpy(out + 4, &tmp16, 2);
+
+       tmp16 = cpu_to_le16(simple_strtoul(uuid + 14, NULL, 16));
+       memcpy(out + 6, &tmp16, 2);
+
+       tmp16 = cpu_to_be16(simple_strtoul(uuid + 19, NULL, 16));
+       memcpy(out + 8, &tmp16, 2);
+
+       tmp64 = cpu_to_be64(simple_strtoull(uuid + 24, NULL, 16));
+       memcpy(out + 10, (char *)&tmp64 + 2, 6);
+}