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| -rw-r--r-- | source3/lib/util_uuid.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/source3/lib/util_uuid.c b/source3/lib/util_uuid.c new file mode 100644 index 0000000000..b70db8de5b --- /dev/null +++ b/source3/lib/util_uuid.c @@ -0,0 +1,108 @@ +/* + * 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); +} |