ceph/src/spdk/dpdk/lib/librte_eal/common/eal_common_uuid.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright (C) 1996, 1997 Theodore Ts'o.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, and the entire permission notice in its entirety,
   9  *    including the disclaimer of warranties.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote
  14  *    products derived from this software without specific prior
  15  *    written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
  20  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
  21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  23  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  24  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  25  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  27  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
  28  * DAMAGE.
  29  */
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdint.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36
  37 #include <rte_uuid.h>
  38
  39 /* UUID packed form */
  40 struct uuid {
  41         uint32_t        time_low;
  42         uint16_t        time_mid;
  43         uint16_t        time_hi_and_version;
  44         uint16_t        clock_seq;
  45         uint8_t         node[6];
  46 };
  47
  48 static void uuid_pack(const struct uuid *uu, rte_uuid_t ptr)
  49 {
  50         uint32_t tmp;
  51         uint8_t *out = ptr;
  52
  53         tmp = uu->time_low;
  54         out[3] = (uint8_t) tmp;
  55         tmp >>= 8;
  56         out[2] = (uint8_t) tmp;
  57         tmp >>= 8;
  58         out[1] = (uint8_t) tmp;
  59         tmp >>= 8;
  60         out[0] = (uint8_t) tmp;
  61
  62         tmp = uu->time_mid;
  63         out[5] = (uint8_t) tmp;
  64         tmp >>= 8;
  65         out[4] = (uint8_t) tmp;
  66
  67         tmp = uu->time_hi_and_version;
  68         out[7] = (uint8_t) tmp;
  69         tmp >>= 8;
  70         out[6] = (uint8_t) tmp;
  71
  72         tmp = uu->clock_seq;
  73         out[9] = (uint8_t) tmp;
  74         tmp >>= 8;
  75         out[8] = (uint8_t) tmp;
  76
  77         memcpy(out+10, uu->node, 6);
  78 }
  79
  80 static void uuid_unpack(const rte_uuid_t in, struct uuid *uu)
  81 {
  82         const uint8_t *ptr = in;
  83         uint32_t tmp;
  84
  85         tmp = *ptr++;
  86         tmp = (tmp << 8) | *ptr++;
  87         tmp = (tmp << 8) | *ptr++;
  88         tmp = (tmp << 8) | *ptr++;
  89         uu->time_low = tmp;
  90
  91         tmp = *ptr++;
  92         tmp = (tmp << 8) | *ptr++;
  93         uu->time_mid = tmp;
  94
  95         tmp = *ptr++;
  96         tmp = (tmp << 8) | *ptr++;
  97         uu->time_hi_and_version = tmp;
  98
  99         tmp = *ptr++;
 100         tmp = (tmp << 8) | *ptr++;
 101         uu->clock_seq = tmp;
 102
 103         memcpy(uu->node, ptr, 6);
 104 }
 105
 106 bool rte_uuid_is_null(const rte_uuid_t uu)
 107 {
 108         const uint8_t *cp = uu;
 109         int i;
 110
 111         for (i = 0; i < 16; i++)
 112                 if (*cp++)
 113                         return false;
 114         return true;
 115 }
 116
 117 /*
 118  * rte_uuid_compare() - compare two UUIDs.
 119  */
 120 int rte_uuid_compare(const rte_uuid_t uu1, const rte_uuid_t uu2)
 121 {
 122         struct uuid     uuid1, uuid2;
 123
 124         uuid_unpack(uu1, &uuid1);
 125         uuid_unpack(uu2, &uuid2);
 126
 127 #define UUCMP(u1, u2) \
 128         do { if (u1 != u2) return (u1 < u2) ? -1 : 1; } while (0)
 129
 130         UUCMP(uuid1.time_low, uuid2.time_low);
 131         UUCMP(uuid1.time_mid, uuid2.time_mid);
 132         UUCMP(uuid1.time_hi_and_version, uuid2.time_hi_and_version);
 133         UUCMP(uuid1.clock_seq, uuid2.clock_seq);
 134 #undef UUCMP
 135
 136         return memcmp(uuid1.node, uuid2.node, 6);
 137 }
 138
 139 int rte_uuid_parse(const char *in, rte_uuid_t uu)
 140 {
 141         struct uuid     uuid;
 142         int             i;
 143         const char      *cp;
 144         char            buf[3];
 145
 146         if (strlen(in) != 36)
 147                 return -1;
 148
 149         for (i = 0, cp = in; i <= 36; i++, cp++) {
 150                 if ((i == 8) || (i == 13) || (i == 18) ||
 151                     (i == 23)) {
 152                         if (*cp == '-')
 153                                 continue;
 154                         else
 155                                 return -1;
 156                 }
 157                 if (i == 36)
 158                         if (*cp == 0)
 159                                 continue;
 160                 if (!isxdigit(*cp))
 161                         return -1;
 162         }
 163
 164         uuid.time_low = strtoul(in, NULL, 16);
 165         uuid.time_mid = strtoul(in+9, NULL, 16);
 166         uuid.time_hi_and_version = strtoul(in+14, NULL, 16);
 167         uuid.clock_seq = strtoul(in+19, NULL, 16);
 168         cp = in+24;
 169         buf[2] = 0;
 170
 171         for (i = 0; i < 6; i++) {
 172                 buf[0] = *cp++;
 173                 buf[1] = *cp++;
 174                 uuid.node[i] = strtoul(buf, NULL, 16);
 175         }
 176
 177         uuid_pack(&uuid, uu);
 178         return 0;
 179 }
 180
 181 void rte_uuid_unparse(const rte_uuid_t uu, char *out, size_t len)
 182 {
 183         struct uuid uuid;
 184
 185         uuid_unpack(uu, &uuid);
 186
 187         snprintf(out, len,
 188                  "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
 189                 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
 190                 uuid.clock_seq >> 8, uuid.clock_seq & 0xFF,
 191                 uuid.node[0], uuid.node[1], uuid.node[2],
 192                 uuid.node[3], uuid.node[4], uuid.node[5]);
 193 }