/*

    Copyright (C) 2011  ABRT team

    Copyright (C) 2011  RedHat Inc

    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.,

    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#include "internal_libreport.h"

static const char hexdigits_locase[] = "0123456789abcdef";

/* Emit a string of hex representation of bytes */

char *bin2hex(char *dst, const char *str, int count)

{

	while (count) {

		unsigned char c = *str++;

		/* put lowercase hex digits */

		*dst++ = hexdigits_locase[c >> 4];

		*dst++ = hexdigits_locase[c & 0xf];

		count--;

	}

	return dst;

}

/* Convert "xxxxxxxx" hex string to binary, no more than COUNT bytes */

char *hex2bin(char *dst, const char *str, int count)

{

	/* Parts commented out with // allow parsing

	 * of strings like "xx:x:x:xx:xx:xx:xxxxxx"

	 * (IPv6, ethernet addresses and the like).

	 */

	errno = EINVAL;

	while (*str && count) {

		uint8_t val;

		uint8_t c;

		c = *str++;

		if (isdigit(c))

			val = c - '0';

		else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')

			val = (c|0x20) - ('a' - 10);

		else

			return NULL;

		val <<= 4;

		c = *str;

		if (isdigit(c))

			val |= c - '0';

		else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')

			val |= (c|0x20) - ('a' - 10);

		//else if (c == ':' || c == '\0')

		//	val >>= 4;

		else

			return NULL;

		*dst++ = val;

		//if (c != '\0')

			str++;

		//if (*str == ':')

		//	str++;

		count--;

	}

	errno = (*str ? ERANGE : 0);

	return dst;

}