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133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*-
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* Copyright (c) 2015 M. Warner Losh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Note: some comments taken from lib/libc/uuid/uuid_from_string.c
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* Copyright (c) 2002 Marcel Moolenaar
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* Copyright (c) 2002 Hiten Mahesh Pandya
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*/
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#include <stand.h>
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#include <uuid.h>
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static int
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hex2int(int ch)
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{
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if (ch >= '0' && ch <= '9')
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return ch - '0';
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if (ch >= 'a' && ch <= 'f')
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return 10 + ch - 'a';
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if (ch >= 'A' && ch <= 'F')
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return 10 + ch - 'A';
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return 16;
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}
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static uint32_t
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fromhex(const char *s, int len, int *ok)
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{
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uint32_t v;
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int i, h;
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if (!*ok)
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return 0;
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v = 0;
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for (i = 0; i < len; i++) {
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h = hex2int(s[i]);
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if (h == 16) {
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*ok = 0;
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return v;
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}
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v = (v << 4) | h;
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}
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return v;
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}
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/*
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* uuid_from_string() - convert a string representation of an UUID into
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* a binary representation.
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* See also:
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* http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm
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*
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* NOTE: The sequence field is in big-endian, while the time fields are in
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* native byte order.
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*
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* 01234567-89ab-cdef-0123-456789abcdef
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* 000000000011111111112222222222333333
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* 012345678901234567890123456789012345
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* - - - -
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* hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb
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*
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*/
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void
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uuid_from_string(const char *s, uuid_t *u, uint32_t *status)
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{
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int ok = 1;
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int n;
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if (s == NULL || *s == '\0') {
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uuid_create_nil(u, status);
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return;
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}
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if (status != NULL)
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*status = uuid_s_invalid_string_uuid;
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if (strlen(s) != 36)
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return;
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/* Only support new format, check for all the right dashes */
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if (s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-')
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return;
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/* native byte order */
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u->time_low = fromhex(s , 8, &ok);
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u->time_mid = fromhex(s + 9, 4, &ok);
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u->time_hi_and_version = fromhex(s + 14, 4, &ok);
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/* Big endian, but presented as a whole number so decode as such */
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u->clock_seq_hi_and_reserved = fromhex(s + 19, 2, &ok);
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u->clock_seq_low = fromhex(s + 21, 2, &ok);
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u->node[0] = fromhex(s + 24, 2, &ok);
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u->node[1] = fromhex(s + 26, 2, &ok);
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u->node[2] = fromhex(s + 28, 2, &ok);
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u->node[3] = fromhex(s + 30, 2, &ok);
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u->node[4] = fromhex(s + 32, 2, &ok);
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u->node[5] = fromhex(s + 34, 2, &ok);
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if (!ok)
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return;
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/* We have a successful scan. Check semantics... */
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n = u->clock_seq_hi_and_reserved;
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if ((n & 0x80) != 0x00 && /* variant 0? */
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(n & 0xc0) != 0x80 && /* variant 1? */
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(n & 0xe0) != 0xc0) { /* variant 2? */
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if (status != NULL)
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*status = uuid_s_bad_version;
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} else {
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if (status != NULL)
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*status = uuid_s_ok;
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}
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}
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