/* * Copyright 2011 Calxeda, Inc. * * SPDX-License-Identifier: GPL-2.0+ */ #include <linux/ctype.h> #include "common.h" /* * This is what a UUID string looks like. * * x is a hexadecimal character. fields are separated by '-'s. When converting * to a binary UUID, le means the field should be converted to little endian, * and be means it should be converted to big endian. * * 0 9 14 19 24 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx * le le le be be */ int uuid_str_valid(const char *uuid) { int i, valid; if (uuid == NULL) return 0; for (i = 0, valid = 1; uuid[i] && valid; i++) { switch (i) { case 8: case 13: case 18: case 23: valid = (uuid[i] == '-'); break; default: valid = isxdigit(uuid[i]); break; } } if (i != 36 || !valid) return 0; return 1; } void uuid_str_to_bin(const char *uuid, unsigned char *out) { uint16_t tmp16; uint32_t tmp32; uint64_t tmp64; if (!uuid || !out) return; tmp32 = cpu_to_le32(simple_strtoul(uuid, NULL, 16)); memcpy(out, &tmp32, 4); tmp16 = cpu_to_le16(simple_strtoul(uuid + 9, NULL, 16)); memcpy(out + 4, &tmp16, 2); tmp16 = cpu_to_le16(simple_strtoul(uuid + 14, NULL, 16)); memcpy(out + 6, &tmp16, 2); tmp16 = cpu_to_be16(simple_strtoul(uuid + 19, NULL, 16)); memcpy(out + 8, &tmp16, 2); tmp64 = cpu_to_be64(simple_strtoull(uuid + 24, NULL, 16)); memcpy(out + 10, (char *)&tmp64 + 2, 6); }