| 1 | /*
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| 2 | * Copyright (c) 2015 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libc
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| 30 | * @{
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| 31 | */
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| 32 | /** @file Universaly Unique Identifier (see RFC 4122)
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| 33 | */
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| 34 |
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| 35 | #include <errno.h>
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| 36 | #include <uuid.h>
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| 37 | #include <stdlib.h>
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| 38 |
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| 39 | /** Generate UUID.
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| 40 | *
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| 41 | * @param uuid Place to store generated UUID
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| 42 | * @return EOK on success or negative error code
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| 43 | */
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| 44 | int uuid_generate(uuid_t *uuid)
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| 45 | {
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| 46 | int i;
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| 47 | struct timeval tv;
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| 48 |
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| 49 | /* XXX This is a rather poor way of generating random numbers */
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| 50 | gettimeofday(&tv, NULL);
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| 51 | srandom(tv.tv_sec ^ tv.tv_usec);
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| 52 |
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| 53 | for (i = 0; i < uuid_bytes; i++)
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| 54 | uuid->b[i] = random();
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| 55 |
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| 56 | /* Version 4 UUID from random or pseudo-random numbers */
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| 57 | uuid->b[8] = (uuid->b[8] & ~0xc0) | 0x40;
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| 58 | uuid->b[6] = (uuid->b[6] & 0xf0) | 0x40;
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| 59 |
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| 60 | return EOK;
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| 61 | }
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| 62 |
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| 63 | /** Encode UUID into binary form per RFC 4122.
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| 64 | *
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| 65 | * @param uuid UUID
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| 66 | * @param buf 16-byte destination buffer
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| 67 | */
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| 68 | void uuid_encode(uuid_t *uuid, uint8_t *buf)
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| 69 | {
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| 70 | int i;
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| 71 |
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| 72 | for (i = 0; i < uuid_bytes; i++)
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| 73 | buf[i] = uuid->b[i];
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| 74 | }
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| 75 |
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| 76 | /** Decode UUID from binary form per RFC 4122.
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| 77 | *
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| 78 | * @param buf 16-byte source buffer
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| 79 | * @param uuid Place to store UUID
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| 80 | */
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| 81 | void uuid_decode(uint8_t *buf, uuid_t *uuid)
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| 82 | {
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| 83 | int i;
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| 84 |
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| 85 | for (i = 0; i < uuid_bytes; i++)
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| 86 | uuid->b[i] = buf[i];
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| 87 | }
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| 88 |
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| 89 | /** @}
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| 90 | */
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