diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Makefile | 1 | ||||
| -rw-r--r-- | lib/uuid.c | 85 |
2 files changed, 86 insertions, 0 deletions
diff --git a/lib/Makefile b/lib/Makefile index 884f64c..075bb8c 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -55,6 +55,7 @@ COBJS-y += ctype.o COBJS-y += div64.o COBJS-y += string.o COBJS-y += time.o +COBJS-$(CONFIG_BOOTP_PXE) += uuid.o COBJS-y += vsprintf.o COBJS := $(COBJS-y) diff --git a/lib/uuid.c b/lib/uuid.c new file mode 100644 index 0000000..10b022f --- /dev/null +++ b/lib/uuid.c @@ -0,0 +1,85 @@ +/* + * Copyright 2011 Calxeda, Inc. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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 + */ + +#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); +} |