/*
 * hexstr.c
 * hexstr
 *
 * Copyright (c) 2004-2005 Denis Defreyne
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * 
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * 
 * - The names of hexstr's contributors may not be used to endorse or
 *   promote products derived from this software without specific prior
 *   written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "hexstr.h"

#define hextobin(c)	((c) >= 'A' && (c) <= 'F' ? c - 'A' + 10 : (c) >= 'a' && (c) <= 'f' ? c - 'a' + 10 : c - '0')

inline char *bintohexstr(const uint8_t *s, size_t len)
{
	char *newstr;
	uint32_t i;
	
	newstr = (char *)malloc((2*len+1)*sizeof(char));
	for(i = 0; i < len; i++) sprintf(newstr+2*i, "%02x", s[i]);
	newstr[2*len] = '\0';
	
	return newstr;
}

inline uint8_t *hextobinstr(const char *s, size_t len)
{
	uint8_t *newstr;
	uint32_t i;
	
	if(len % 2) return NULL;
	newstr = (char *)malloc(len/2+1);
	for(i = 0; i < len/2; i++) newstr[i] = hextobin(s[2*i+1]) + hextobin(s[2*i])*16;
	
	return newstr;
}