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 #ifndef _UUID_UUID_PRIVATE_H
  35 #define _UUID_UUID_PRIVATE_H
  36
  37 #include <inttypes.h>
  38 #include <sys/types.h>
  39
  40 #include "uuid.h"
  41
  42 #define LIBUUID_CLOCK_FILE      "/var/lib/libuuid/clock.txt"
  43
  44 /*
  45  * Offset between 15-Oct-1582 and 1-Jan-70
  46  */
  47 #define TIME_OFFSET_HIGH 0x01B21DD2
  48 #define TIME_OFFSET_LOW  0x13814000
  49
  50 /*
  51  * Note that RFC4122 defines UUID in more details:
  52  *
  53  *     Field               Data Type     Octet  Note
  54  * -------------------------------------------------
  55  *  time_low               unsigned 32   0-3    The low field of the
  56  *                         bit integer          timestamp
  57  *
  58  *  time_mid               unsigned 16   4-5    The middle field of the
  59  *                         bit integer          timestamp
  60  *
  61  *  time_hi_and_version    unsigned 16   6-7    The high field of the
  62  *                         bit integer          timestamp multiplexed
  63  *                                              with the version number
  64  *
  65  *  clock_seq_hi_and_rese  unsigned 8    8      The high field of the
  66  *  rved                   bit integer          clock sequence
  67  *                                              multiplexed with the
  68  *                                              variant
  69  *
  70  *  clock_seq_low          unsigned 8    9      The low field of the
  71  *                         bit integer          clock sequence
  72  *
  73  *  node                   unsigned 48   10-15  The spatially unique
  74  *                         bit integer          node identifier
  75  *
  76  * We have clock_seq_hi_and_reserved (8bit) and clock_seq_low (8bit)
  77  * merged into clock_seq (16bit).
  78  */
  79 struct uuid {
  80         uint32_t        time_low;
  81         uint16_t        time_mid;
  82         uint16_t        time_hi_and_version;
  83         uint16_t        clock_seq;
  84         uint8_t node[6];
  85 };
  86
  87
  88 /*
  89  * prototypes
  90  */
  91 void uuid_pack(const struct uuid *uu, uuid_t ptr);
  92 void uuid_unpack(const uuid_t in, struct uuid *uu);
  93
  94 #endif /* _UUID_UUID_PRIVATE_H */