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Diffstat (limited to 'lib/libstand/uuid_from_string.c')
| -rw-r--r-- | lib/libstand/uuid_from_string.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/lib/libstand/uuid_from_string.c b/lib/libstand/uuid_from_string.c new file mode 100644 index 0000000..2d5a6dd --- /dev/null +++ b/lib/libstand/uuid_from_string.c @@ -0,0 +1,132 @@ +/*- + * Copyright (c) 2015 M. Warner Losh + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * Note: some comments taken from lib/libc/uuid/uuid_from_string.c + * Copyright (c) 2002 Marcel Moolenaar + * Copyright (c) 2002 Hiten Mahesh Pandya + */ + + +#include <stand.h> +#include <uuid.h> + +static int +hex2int(int ch) +{ + if (ch >= '0' && ch <= '9') + return ch - '0'; + if (ch >= 'a' && ch <= 'f') + return 10 + ch - 'a'; + if (ch >= 'A' && ch <= 'F') + return 10 + ch - 'A'; + return 16; +} + +static uint32_t +fromhex(const char *s, int len, int *ok) +{ + uint32_t v; + int i, h; + + if (!*ok) + return 0; + v = 0; + for (i = 0; i < 8; i++) { + h = hex2int(s[i]); + if (h == 16) { + *ok = 0; + return v; + } + v = (v << 4) | h; + } + return v; +} + +/* + * uuid_from_string() - convert a string representation of an UUID into + * a binary representation. + * See also: + * http://www.opengroup.org/onlinepubs/009629399/uuid_from_string.htm + * + * NOTE: The sequence field is in big-endian, while the time fields are in + * native byte order. + * + * 01234567-89ab-cdef-0123-456789abcdef + * 000000000011111111112222222222333333 + * 012345678901234567890123456789012345 + * - - - - + * hhhhhhhh-hhhh-hhhh-bbbb-bbbbbbbbbbbb + * + */ +void +uuid_from_string(const char *s, uuid_t *u, uint32_t *status) +{ + int ok = 1; + int n; + + if (s == NULL || *s == '\0') { + uuid_create_nil(u, status); + return; + } + + if (status != NULL) + *status = uuid_s_invalid_string_uuid; + if (strlen(s) != 36) + return; + /* Only support new format, check for all the right dashes */ + if (s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-') + return; + /* native byte order */ + u->time_low = fromhex(s , 8, &ok); + u->time_mid = fromhex(s + 9, 4, &ok); + u->time_hi_and_version = fromhex(s + 14, 4, &ok); + /* Big endian, but presented as a whole number so decode as such */ + u->clock_seq_hi_and_reserved = fromhex(s + 19, 2, &ok); + u->clock_seq_low = fromhex(s + 21, 2, &ok); + u->node[0] = fromhex(s + 24, 2, &ok); + u->node[1] = fromhex(s + 26, 2, &ok); + u->node[2] = fromhex(s + 28, 2, &ok); + u->node[3] = fromhex(s + 30, 2, &ok); + u->node[4] = fromhex(s + 32, 2, &ok); + u->node[5] = fromhex(s + 34, 2, &ok); + if (!ok) + return; + + /* We have a successful scan. Check semantics... */ + n = u->clock_seq_hi_and_reserved; + if ((n & 0x80) != 0x00 && /* variant 0? */ + (n & 0xc0) != 0x80 && /* variant 1? */ + (n & 0xe0) != 0xc0) { /* variant 2? */ + if (status != NULL) + *status = uuid_s_bad_version; + } else { + if (status != NULL) + *status = uuid_s_ok; + } +} |
