diff options
Diffstat (limited to 'uuid.c')
| -rw-r--r-- | uuid.c | 112 |
1 files changed, 112 insertions, 0 deletions
@@ -0,0 +1,112 @@ +/* + * mdadm - manage Linux "md" devices aka RAID arrays. + * + * Copyright (C) 2001-2013 Neil Brown <neilb@suse.de> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Author: Neil Brown + * Email: <neilb@suse.de> + */ + +#include <string.h> + +const int uuid_zero[4] = { 0, 0, 0, 0 }; + +int same_uuid(int a[4], int b[4], int swapuuid) +{ + if (swapuuid) { + /* parse uuids are hostendian. + * uuid's from some superblocks are big-ending + * if there is a difference, we need to swap.. + */ + unsigned char *ac = (unsigned char *)a; + unsigned char *bc = (unsigned char *)b; + int i; + for (i = 0; i < 16; i += 4) { + if (ac[i+0] != bc[i+3] || + ac[i+1] != bc[i+2] || + ac[i+2] != bc[i+1] || + ac[i+3] != bc[i+0]) + return 0; + } + return 1; + } else { + if (a[0]==b[0] && + a[1]==b[1] && + a[2]==b[2] && + a[3]==b[3]) + return 1; + return 0; + } +} + +void copy_uuid(void *a, int b[4], int swapuuid) +{ + if (swapuuid) { + /* parse uuids are hostendian. + * uuid's from some superblocks are big-ending + * if there is a difference, we need to swap.. + */ + unsigned char *ac = (unsigned char *)a; + unsigned char *bc = (unsigned char *)b; + int i; + for (i = 0; i < 16; i += 4) { + ac[i+0] = bc[i+3]; + ac[i+1] = bc[i+2]; + ac[i+2] = bc[i+1]; + ac[i+3] = bc[i+0]; + } + } else + memcpy(a, b, 16); +} + +/* + * Parse a 128 bit uuid in 4 integers + * format is 32 hexx nibbles with options :.<space> separator + * If not exactly 32 hex digits are found, return 0 + * else return 1 + */ +int parse_uuid(char *str, int uuid[4]) +{ + int hit = 0; /* number of Hex digIT */ + int i; + char c; + for (i = 0; i < 4; i++) + uuid[i] = 0; + + while ((c = *str++) != 0) { + int n; + if (c >= '0' && c <= '9') + n = c-'0'; + else if (c >= 'a' && c <= 'f') + n = 10 + c - 'a'; + else if (c >= 'A' && c <= 'F') + n = 10 + c - 'A'; + else if (strchr(":. -", c)) + continue; + else return 0; + + if (hit<32) { + uuid[hit/8] <<= 4; + uuid[hit/8] += n; + } + hit++; + } + if (hit == 32) + return 1; + return 0; +} |