1 /* 2 * Copyright 2011 Calxeda, Inc. 3 * 4 * See file CREDITS for list of people who contributed to this 5 * project. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License as 9 * published by the Free Software Foundation; either version 2 of 10 * the License, or (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 20 * MA 02111-1307 USA 21 */ 22 23 #include <linux/ctype.h> 24 #include "common.h" 25 26 /* 27 * This is what a UUID string looks like. 28 * 29 * x is a hexadecimal character. fields are separated by '-'s. When converting 30 * to a binary UUID, le means the field should be converted to little endian, 31 * and be means it should be converted to big endian. 32 * 33 * 0 9 14 19 24 34 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 35 * le le le be be 36 */ 37 38 int uuid_str_valid(const char *uuid) 39 { 40 int i, valid; 41 42 if (uuid == NULL) 43 return 0; 44 45 for (i = 0, valid = 1; uuid[i] && valid; i++) { 46 switch (i) { 47 case 8: case 13: case 18: case 23: 48 valid = (uuid[i] == '-'); 49 break; 50 default: 51 valid = isxdigit(uuid[i]); 52 break; 53 } 54 } 55 56 if (i != 36 || !valid) 57 return 0; 58 59 return 1; 60 } 61 62 void uuid_str_to_bin(const char *uuid, unsigned char *out) 63 { 64 uint16_t tmp16; 65 uint32_t tmp32; 66 uint64_t tmp64; 67 68 if (!uuid || !out) 69 return; 70 71 tmp32 = cpu_to_le32(simple_strtoul(uuid, NULL, 16)); 72 memcpy(out, &tmp32, 4); 73 74 tmp16 = cpu_to_le16(simple_strtoul(uuid + 9, NULL, 16)); 75 memcpy(out + 4, &tmp16, 2); 76 77 tmp16 = cpu_to_le16(simple_strtoul(uuid + 14, NULL, 16)); 78 memcpy(out + 6, &tmp16, 2); 79 80 tmp16 = cpu_to_be16(simple_strtoul(uuid + 19, NULL, 16)); 81 memcpy(out + 8, &tmp16, 2); 82 83 tmp64 = cpu_to_be64(simple_strtoull(uuid + 24, NULL, 16)); 84 memcpy(out + 10, (char *)&tmp64 + 2, 6); 85 } 86