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/*
* Unix SMB/CIFS implementation.
* UUID server routines
* Copyright (C) Theodore Ts'o 1996, 1997,
* Copyright (C) Jim McDonough 2002.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*
* Offset between 15-Oct-1582 and 1-Jan-70
*/
#define TIME_OFFSET_HIGH 0x01B21DD2
#define TIME_OFFSET_LOW 0x13814000
struct uuid {
uint32 time_low;
uint16 time_mid;
uint16 time_hi_and_version;
uint16 clock_seq;
uint8 node[6];
};
static void uuid_pack(const struct uuid *uu, GUID *ptr)
{
uint32 tmp;
uint8 *out = ptr->info;
tmp = uu->time_low;
out[3] = (uint8) tmp;
tmp >>= 8;
out[2] = (uint8) tmp;
tmp >>= 8;
out[1] = (uint8) tmp;
tmp >>= 8;
out[0] = (uint8) tmp;
tmp = uu->time_mid;
out[5] = (uint8) tmp;
tmp >>= 8;
out[4] = (uint8) tmp;
tmp = uu->time_hi_and_version;
out[7] = (uint8) tmp;
tmp >>= 8;
out[6] = (uint8) tmp;
tmp = uu->clock_seq;
out[9] = (uint8) tmp;
tmp >>= 8;
out[8] = (uint8) tmp;
memcpy(out+10, uu->node, 6);
}
static void uuid_unpack(const GUID in, struct uuid *uu)
{
const uint8 *ptr = in.info;
uint32 tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
tmp = (tmp << 8) | *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_low = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_mid = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->time_hi_and_version = tmp;
tmp = *ptr++;
tmp = (tmp << 8) | *ptr++;
uu->clock_seq = tmp;
memcpy(uu->node, ptr, 6);
}
void uuid_generate_random(GUID *out)
{
GUID tmp;
struct uuid uu;
generate_random_buffer(tmp.info, sizeof(tmp.info), True);
uuid_unpack(tmp, &uu);
uu.clock_seq = (uu.clock_seq & 0x3FFF) | 0x8000;
uu.time_hi_and_version = (uu.time_hi_and_version & 0x0FFF) | 0x4000;
uuid_pack(&uu, out);
}
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