2 * uuid_time.c --- Interpret the time field from a uuid. This program
3 * violates the UUID abstraction barrier by reaching into the guts
4 * of a UUID and interpreting it.
6 * Copyright (C) 1998, 1999 Theodore Ts'o.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, and the entire permission notice in its entirety,
14 * including the disclaimer of warranties.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 * products derived from this software without specific prior
22 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
25 * WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
28 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
29 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
32 * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
38 #define _WIN32_WINNT 0x0500
48 #include <sys/types.h>
49 #ifdef HAVE_SYS_TIME_H
56 time_t uuid_time(const uuid_t uu, struct timeval *ret_tv)
63 uuid_unpack(uu, &uuid);
65 high = uuid.time_mid | ((uuid.time_hi_and_version & 0xFFF) << 16);
66 clock_reg = uuid.time_low | ((uint64_t) high << 32);
68 clock_reg -= (((uint64_t) 0x01B21DD2) << 32) + 0x13814000;
69 tv.tv_sec = clock_reg / 10000000;
70 tv.tv_usec = (clock_reg % 10000000) / 10;
78 int uuid_type(const uuid_t uu)
82 uuid_unpack(uu, &uuid);
83 return ((uuid.time_hi_and_version >> 12) & 0xF);
86 int uuid_variant(const uuid_t uu)
91 uuid_unpack(uu, &uuid);
94 if ((var & 0x8000) == 0)
95 return UUID_VARIANT_NCS;
96 if ((var & 0x4000) == 0)
97 return UUID_VARIANT_DCE;
98 if ((var & 0x2000) == 0)
99 return UUID_VARIANT_MICROSOFT;
100 return UUID_VARIANT_OTHER;
104 static const char *variant_string(int variant)
107 case UUID_VARIANT_NCS:
109 case UUID_VARIANT_DCE:
111 case UUID_VARIANT_MICROSOFT:
120 main(int argc, char **argv)
128 fprintf(stderr, "Usage: %s uuid\n", argv[0]);
131 if (uuid_parse(argv[1], buf)) {
132 fprintf(stderr, "Invalid UUID: %s\n", argv[1]);
135 variant = uuid_variant(buf);
136 type = uuid_type(buf);
137 time_reg = uuid_time(buf, &tv);
139 printf("UUID variant is %d (%s)\n", variant, variant_string(variant));
140 if (variant != UUID_VARIANT_DCE) {
141 printf("Warning: This program only knows how to interpret "
142 "DCE UUIDs.\n\tThe rest of the output is likely "
143 "to be incorrect!!\n");
145 printf("UUID type is %d", type);
148 printf(" (time based)\n");
154 printf(" (name-based)\n");
157 printf(" (random)\n");
163 printf("Warning: not a time-based UUID, so UUID time "
164 "decoding will likely not work!\n");
166 printf("UUID time is: (%ld, %ld): %s\n", tv.tv_sec, tv.tv_usec,