lib/uuid: Add UUID parsing function
Implement a simple function that parses a canonical UUID string into the common byte representation. Inspired by acpigen_write_uuid(). Change-Id: Ia1bd883c740873699814fde6c6ddc1937a40093e Signed-off-by: Nico Huber <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/36297 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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@ -18,6 +18,22 @@
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#include <string.h>
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#define UUID_LEN 16
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#define UUID_STRLEN 36
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/*
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* Parses a canonical UUID string into the common byte representation
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* where the first three words are interpreted as little endian:
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*
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* The UUID
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* "00112233-4455-6677-8899-aabbccddeeff"
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* is stored as
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* 33 22 11 00 55 44 77 66 88 99 aa bb cc dd ee ff
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*
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* Returns negative value on error, 0 on success.
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*/
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int parse_uuid(uint8_t *uuid, const char *uuid_str);
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typedef struct {
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uint8_t b[16];
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} __packed guid_t;
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@ -346,3 +346,5 @@ cbfs-files-$(CONFIG_GENERIC_SPD_BIN) += spd.bin
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spd.bin-file := $(LIB_SPD_BIN)
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spd.bin-type := spd
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endif
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ramstage-y += uuid.c
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@ -0,0 +1,35 @@
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/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdint.h>
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#include <lib.h>
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#include <uuid.h>
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int parse_uuid(uint8_t *const uuid, const char *const uuid_str)
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{
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const uint8_t order[] = { 3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15 };
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uint8_t uuid_binstr[UUID_LEN];
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unsigned int i;
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if (strlen(uuid_str) != UUID_STRLEN)
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return -1;
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if (uuid_str[8] != '-' || uuid_str[13] != '-' ||
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uuid_str[18] != '-' || uuid_str[23] != '-')
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return -1;
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if (hexstrtobin(uuid_str, uuid_binstr, UUID_LEN) != UUID_LEN)
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return -1;
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for (i = 0; i < UUID_LEN; ++i)
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uuid[i] = uuid_binstr[order[i]];
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return 0;
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}
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