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158 lines
2.9 KiB
158 lines
2.9 KiB
/*
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* Copyright (c) 2021-2022, Arm Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdint.h>
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#include <string.h>
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#include <common/debug.h>
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#include <common/uuid.h>
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/* Return the hex nibble value of a char */
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static int8_t hex_val(char hex)
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{
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int8_t val = 0;
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if ((hex >= '0') && (hex <= '9')) {
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val = (int8_t)(hex - '0');
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} else if ((hex >= 'a') && (hex <= 'f')) {
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val = (int8_t)(hex - 'a' + 0xa);
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} else if ((hex >= 'A') && (hex <= 'F')) {
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val = (int8_t)(hex - 'A' + 0xa);
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} else {
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val = -1;
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}
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return val;
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}
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/*
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* Read hex_src_len hex characters from hex_src, convert to bytes and
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* store in buffer pointed to by dest
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*/
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static int read_hex(uint8_t *dest, char *hex_src, unsigned int hex_src_len)
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{
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int8_t nibble;
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uint8_t byte;
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/*
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* The string length must be a multiple of 2 to represent an
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* exact number of bytes.
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*/
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assert((hex_src_len % 2U) == 0U);
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for (unsigned int i = 0U; i < (hex_src_len / 2U); i++) {
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nibble = 0;
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byte = 0U;
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nibble = hex_val(hex_src[2U * i]);
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if (nibble < 0) {
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return -1;
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}
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byte = (uint8_t)nibble;
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byte <<= 4U;
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nibble = hex_val(hex_src[(2U * i) + 1U]);
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if (nibble < 0) {
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return -1;
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}
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byte |= (uint8_t)nibble;
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*dest = byte;
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dest++;
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}
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return 0;
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}
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/* Parse UUIDs of the form aabbccdd-eeff-4099-8877-665544332211 */
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int read_uuid(uint8_t *dest, char *uuid)
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{
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int err;
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uint8_t *dest_start = dest;
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/* Check that we have enough characters */
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if (strnlen(uuid, UUID_STRING_LENGTH) != UUID_STRING_LENGTH) {
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WARN("UUID string is too short\n");
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return -EINVAL;
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}
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/* aabbccdd */
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err = read_hex(dest, uuid, 8);
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uuid += 8;
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dest += 4;
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/* Check for '-' */
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err |= ((*uuid == '-') ? 0 : -1);
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uuid++;
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/* eeff */
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err |= read_hex(dest, uuid, 4);
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uuid += 4;
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dest += 2;
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/* Check for '-' */
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err |= ((*uuid == '-') ? 0 : -1);
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uuid++;
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/* 4099 */
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err |= read_hex(dest, uuid, 4);
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uuid += 4;
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dest += 2;
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/* Check for '-' */
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err |= ((*uuid == '-') ? 0 : -1);
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uuid++;
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/* 8877 */
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err |= read_hex(dest, uuid, 4);
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uuid += 4;
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dest += 2;
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/* Check for '-' */
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err |= ((*uuid == '-') ? 0 : -1);
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uuid++;
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/* 665544332211 */
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err |= read_hex(dest, uuid, 12);
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uuid += 12;
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dest += 6;
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if (err < 0) {
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WARN("Error parsing UUID\n");
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/* Clear the buffer on error */
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memset((void *)dest_start, '\0', UUID_BYTES_LENGTH * sizeof(uint8_t));
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Helper function to check if 2 UUIDs match.
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*/
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bool uuid_match(uint32_t *uuid1, uint32_t *uuid2)
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{
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return !memcmp(uuid1, uuid2, sizeof(uint32_t) * 4);
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}
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/*
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* Helper function to copy from one UUID struct to another.
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*/
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void copy_uuid(uint32_t *to_uuid, uint32_t *from_uuid)
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{
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to_uuid[0] = from_uuid[0];
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to_uuid[1] = from_uuid[1];
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to_uuid[2] = from_uuid[2];
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to_uuid[3] = from_uuid[3];
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}
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bool is_null_uuid(uint32_t *uuid)
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{
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return (uuid[0] == 0 && uuid[1] == 0 &&
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uuid[2] == 0 && uuid[3] == 0);
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}
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