/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * 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:
 *
 * Copyright (C) 2010 Red Hat, Inc.
 */

#include <config.h>
#include <glib.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>

#include "mm-utils.h"

/* From hostap, Copyright (c) 2002-2005, Jouni Malinen <jkmaline@cc.hut.fi> */

static int hex2num (char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;
	return -1;
}

int utils_hex2byte (const char *hex)
{
	int a, b;
	a = hex2num(*hex++);
	if (a < 0)
		return -1;
	b = hex2num(*hex++);
	if (b < 0)
		return -1;
	return (a << 4) | b;
}

char *
utils_hexstr2bin (const char *hex, gsize *out_len)
{
    size_t len = strlen (hex);
	size_t       i;
	int          a;
	const char * ipos = hex;
	char *       buf = NULL;
	char *       opos;

	/* Length must be a multiple of 2 */
    g_return_val_if_fail ((len % 2) == 0, NULL);

	opos = buf = g_malloc0 ((len / 2) + 1);
	for (i = 0; i < len; i += 2) {
		a = utils_hex2byte (ipos);
		if (a < 0) {
			g_free (buf);
			return NULL;
		}
		*opos++ = a;
		ipos += 2;
	}
    *out_len = len / 2;
	return buf;
}

/* End from hostap */