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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* asc2bin.cc
*
* Thu Sep 5 11:12:50 CEST 2013
* Copyright 2013 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of lrtp.
*
* lrtp is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* lrtp 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with lrtp; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "asc2bin.h"
#include <string.h>
static int asc2nibble(unsigned char c)
{
if(c >= '0' && c <= '9') return c - '0';
if(c >= 'a' && c <= 'f') return c - 'a' + 0xa;
if(c >= 'A' && c <= 'F') return c - 'A' + 0xa;
return -1;
}
ssize_t asc2bin(char *raw, size_t rawsz, const char *hex, size_t hexlen)
{
if(hexlen % 2 != 0) return -1;
if(rawsz < hexlen / 2) return -1;
unsigned char val;
int nibble;
size_t size = 0;
while(size < hexlen / 2) {
nibble = asc2nibble(hex[0]);
if(nibble == -1) return -1;
val = (nibble << 4);
nibble = asc2nibble(hex[1]);
if(nibble == -1) return -1;
val |= (nibble & 0xff);
*raw = val;
raw++;
size++;
hex += 2;
}
return (ssize_t)size;
}
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