/*
 * Copyright 2012 (C) Christian Franke <nobody at nowhere dot ws>
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "util.h"

uint8_t parse_hex_char(char input)
{
	if (input >= '0' && input <= '9')
		return input - '0';

	if (input >= 'A' && input <= 'F')
		return 10 + input - 'A';

	if (input >= 'a' && input <= 'f')
		return 10 + input - 'a';

	return -1;
}

uint8_t parse_hex_number(char *buffer, uint8_t *target)
{
	uint8_t rv;

	rv = parse_hex_char(buffer[0]);
	if (rv == -1)
		return 1;
	*target = rv << 4;

	rv = parse_hex_char(buffer[1]);
	if (rv == -1)
		return 1;
	*target += rv;

	return 0;
}