[net-next-2.6.git] / lib / uuid.c

/*
 * Unified UUID/GUID definition
 *
 * Copyright (C) 2009, Intel Corp.
 *	Huang Ying <ying.huang@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation;
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/uuid.h>
#include <linux/random.h>

static void __uuid_gen_common(__u8 b[16])
{
	int i;
	u32 r;

	for (i = 0; i < 4; i++) {
		r = random32();
		memcpy(b + i * 4, &r, 4);
	}
	/* reversion 0b10 */
	b[8] = (b[8] & 0x3F) | 0x80;
}

void uuid_le_gen(uuid_le *lu)
{
	__uuid_gen_common(lu->b);
	/* version 4 : random generation */
	lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
}
EXPORT_SYMBOL_GPL(uuid_le_gen);

void uuid_be_gen(uuid_be *bu)
{
	__uuid_gen_common(bu->b);
	/* version 4 : random generation */
	bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
}
EXPORT_SYMBOL_GPL(uuid_be_gen);
Commit	Line	Data
fab1c232 HY	1	/*
	2	* Unified UUID/GUID definition
	3	*
	4	* Copyright (C) 2009, Intel Corp.
	5	* Huang Ying <ying.huang@intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License version
	9	* 2 as published by the Free Software Foundation;
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/uuid.h>
	24	#include <linux/random.h>
	25
	26	static void __uuid_gen_common(__u8 b[16])
	27	{
	28	int i;
	29	u32 r;
	30
	31	for (i = 0; i < 4; i++) {
	32	r = random32();
	33	memcpy(b + i * 4, &r, 4);
	34	}
	35	/* reversion 0b10 */
	36	b[8] = (b[8] & 0x3F) \| 0x80;
	37	}
	38
	39	void uuid_le_gen(uuid_le *lu)
	40	{
	41	__uuid_gen_common(lu->b);
	42	/* version 4 : random generation */
	43	lu->b[7] = (lu->b[7] & 0x0F) \| 0x40;
	44	}
	45	EXPORT_SYMBOL_GPL(uuid_le_gen);
	46
	47	void uuid_be_gen(uuid_be *bu)
	48	{
	49	__uuid_gen_common(bu->b);
	50	/* version 4 : random generation */
	51	bu->b[6] = (bu->b[6] & 0x0F) \| 0x40;
	52	}
	53	EXPORT_SYMBOL_GPL(uuid_be_gen);