1 /* 2 * Copyright 2011 Calxeda, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <linux/ctype.h> 8 #include "common.h" 9 10 /* 11 * This is what a UUID string looks like. 12 * 13 * x is a hexadecimal character. fields are separated by '-'s. When converting 14 * to a binary UUID, le means the field should be converted to little endian, 15 * and be means it should be converted to big endian. 16 * 17 * 0 9 14 19 24 18 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx 19 * le le le be be 20 */ 21 22 int uuid_str_valid(const char *uuid) 23 { 24 int i, valid; 25 26 if (uuid == NULL) 27 return 0; 28 29 for (i = 0, valid = 1; uuid[i] && valid; i++) { 30 switch (i) { 31 case 8: case 13: case 18: case 23: 32 valid = (uuid[i] == '-'); 33 break; 34 default: 35 valid = isxdigit(uuid[i]); 36 break; 37 } 38 } 39 40 if (i != 36 || !valid) 41 return 0; 42 43 return 1; 44 } 45 46 void uuid_str_to_bin(const char *uuid, unsigned char *out) 47 { 48 uint16_t tmp16; 49 uint32_t tmp32; 50 uint64_t tmp64; 51 52 if (!uuid || !out) 53 return; 54 55 tmp32 = cpu_to_le32(simple_strtoul(uuid, NULL, 16)); 56 memcpy(out, &tmp32, 4); 57 58 tmp16 = cpu_to_le16(simple_strtoul(uuid + 9, NULL, 16)); 59 memcpy(out + 4, &tmp16, 2); 60 61 tmp16 = cpu_to_le16(simple_strtoul(uuid + 14, NULL, 16)); 62 memcpy(out + 6, &tmp16, 2); 63 64 tmp16 = cpu_to_be16(simple_strtoul(uuid + 19, NULL, 16)); 65 memcpy(out + 8, &tmp16, 2); 66 67 tmp64 = cpu_to_be64(simple_strtoull(uuid + 24, NULL, 16)); 68 memcpy(out + 10, (char *)&tmp64 + 2, 6); 69 } 70