libuuid/src/uuidP.h

   1 /*
   2  * uuid.h -- private header file for uuids
   3  *
   4  * Copyright (C) 1996, 1997 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, and the entire permission notice in its entirety,
  12  *    including the disclaimer of warranties.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. The name of the author may not be used to endorse or promote
  17  *    products derived from this software without specific prior
  18  *    written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  21  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
  23  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
  24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  27  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  30  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
  31  * DAMAGE.
  32  * %End-Header%
  33  */
  34
  35 #include <inttypes.h>
  36 #include <sys/types.h>
  37
  38 #include "uuid.h"
  39
  40 #define LIBUUID_CLOCK_FILE      "/var/lib/libuuid/clock.txt"
  41
  42 /*
  43  * Offset between 15-Oct-1582 and 1-Jan-70
  44  */
  45 #define TIME_OFFSET_HIGH 0x01B21DD2
  46 #define TIME_OFFSET_LOW  0x13814000
  47
  48 /*
  49  * Note that RFC4122 defines UUID in more details:
  50  *
  51  *     Field               Data Type     Octet  Note
  52  * -------------------------------------------------
  53  *  time_low               unsigned 32   0-3    The low field of the
  54  *                         bit integer          timestamp
  55  *
  56  *  time_mid               unsigned 16   4-5    The middle field of the
  57  *                         bit integer          timestamp
  58  *
  59  *  time_hi_and_version    unsigned 16   6-7    The high field of the
  60  *                         bit integer          timestamp multiplexed
  61  *                                              with the version number
  62  *
  63  *  clock_seq_hi_and_rese  unsigned 8    8      The high field of the
  64  *  rved                   bit integer          clock sequence
  65  *                                              multiplexed with the
  66  *                                              variant
  67  *
  68  *  clock_seq_low          unsigned 8    9      The low field of the
  69  *                         bit integer          clock sequence
  70  *
  71  *  node                   unsigned 48   10-15  The spatially unique
  72  *                         bit integer          node identifier
  73  *
  74  * We have clock_seq_hi_and_reserved (8bit) and clock_seq_low (8bit)
  75  * merged into clock_seq (16bit).
  76  */
  77 struct uuid {
  78         uint32_t        time_low;
  79         uint16_t        time_mid;
  80         uint16_t        time_hi_and_version;
  81         uint16_t        clock_seq;
  82         uint8_t node[6];
  83 };
  84
  85
  86 /*
  87  * prototypes
  88  */
  89 void uuid_pack(const struct uuid *uu, uuid_t ptr);
  90 void uuid_unpack(const uuid_t in, struct uuid *uu);