Show base16.c syntax highlighted
/*
* $Id: base16.c 12693 2007-01-01 13:23:14Z cbiere $
*
* Copyright (c) 2007, Christian Biere
*
*----------------------------------------------------------------------
* This file is part of gtk-gnutella.
*
* gtk-gnutella 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.
*
* gtk-gnutella 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 gtk-gnutella; if not, write to the Free Software
* Foundation, Inc.:
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*----------------------------------------------------------------------
*/
/*
* Copyright (c) 2006 Christian Biere <christianbiere@gmx.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the authors nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 REGENTS 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 "common.h"
#include "lib/base16.h"
#include "lib/misc.h"
#include "lib/override.h" /* Must be the last header included */
/*
* See RFC 3548 for details about Base 16 encoding:
* http://www.faqs.org/rfcs/rfc3548.html
*/
static const char base16_alphabet[] = "0123456789abcdef";
size_t
base16_encode(char *dst, size_t size, const void *data, size_t len)
{
const unsigned char *p = data;
char *q = dst;
size_t i;
if (size / 2 < len) {
len = size * 2;
}
for (i = 0; i < len; i++) {
unsigned char c = p[i] & 0xff;
*q++ = base16_alphabet[(c >> 4) & 0xf];
*q++ = base16_alphabet[c & 0xf];
}
return q - dst;
}
size_t
base16_decode(char *dst, size_t size, const void *data, size_t len)
{
const unsigned char *p = data;
char *q = dst;
size_t i;
if (size < len / 2) {
len = size * 2;
}
for (i = 0; i < len; i++) {
int c;
c = hex2int_inline(p[i]);
if (c < 0) {
return (size_t) -1;
}
if ((i & 1) == 0) {
*q = c << 4;
} else {
*q++ |= c;
}
}
return q - dst;
}
/* vi: set ai et sts=2 sw=2 cindent: */
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