From 4e4815feae4d37032a7afce18a4c26074c51f159 Mon Sep 17 00:00:00 2001
From: Przemyslaw Marczak
Date: Wed, 2 Apr 2014 10:20:04 +0200
Subject: lib: uuid: add functions to generate UUID version 4
This patch adds support to generate UUID (Universally Unique Identifier)
in version 4 based on RFC4122, which is randomly.
Source: https://www.ietf.org/rfc/rfc4122.txt
Changes:
- new configs:
- CONFIG_LIB_UUID for compile lib/uuid.c
- CONFIG_RANDOM_UUID for functions gen_rand_uuid() and gen_rand_uuid_str()
- add configs dependency to include/config_fallbacks.h for lib uuid.
lib/uuid.c:
- add gen_rand_uuid() - this function writes 16 bytes len binary representation
of UUID v4 to the memory at given address.
- add gen_rand_uuid_str() - this function writes 37 bytes len hexadecimal
ASCII string representation of UUID v4 to the memory at given address.
Signed-off-by: Przemyslaw Marczak
Cc: Stephen Warren
Cc: Lukasz Majewski
[trini: Add CONFIG_EFI_PARTITION to fallbacks]
Signed-off-by: Tom Rini
---
include/uuid.h | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
(limited to 'include/uuid.h')
diff --git a/include/uuid.h b/include/uuid.h
index e8feeed7a5..93027c1b28 100644
--- a/include/uuid.h
+++ b/include/uuid.h
@@ -7,15 +7,35 @@
#ifndef __UUID_H__
#define __UUID_H__
+/* This is structure is in big-endian */
+struct uuid {
+ unsigned int time_low;
+ unsigned short time_mid;
+ unsigned short time_hi_and_version;
+ unsigned char clock_seq_hi_and_reserved;
+ unsigned char clock_seq_low;
+ unsigned char node[6];
+} __packed;
+
enum {
UUID_STR_FORMAT_STD,
UUID_STR_FORMAT_GUID
};
#define UUID_STR_LEN 36
-#define UUID_BIN_LEN 16
+#define UUID_BIN_LEN sizeof(struct uuid)
+
+#define UUID_VERSION_MASK 0xf000
+#define UUID_VERSION_SHIFT 12
+#define UUID_VERSION 0x4
+
+#define UUID_VARIANT_MASK 0xc0
+#define UUID_VARIANT_SHIFT 7
+#define UUID_VARIANT 0x1
int uuid_str_valid(const char *uuid);
int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format);
void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format);
+void gen_rand_uuid(unsigned char *uuid_bin);
+void gen_rand_uuid_str(char *uuid_str, int str_format);
#endif
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