/*
 * Copyright (c) 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * 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 Institute 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 INSTITUTE 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 INSTITUTE 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 "der_locl.h"
#include <hex.h>

RCSID("$Id: der_format.c,v 1.2 2006/01/16 23:01:11 lha Exp $");

int
der_parse_hex_heim_integer (const char *p, heim_integer *data)
{
    ssize_t len;

    data->length = 0;
    data->negative = 0;
    data->data = NULL;

    if (*p == '-') {
	p++;
	data->negative = 1;
    }

    len = strlen(p);
    if (len < 0) {
	data->data = NULL;
	data->length = 0;
	return EINVAL;
    }
    
    data->length = (len / 2) + 1;
    data->data = malloc(data->length);
    if (data->data == NULL) {
	data->length = 0;
	return ENOMEM;
    }

    len = hex_decode(p, data->data, data->length);
    if (len < 0) {
	free(data->data);
	data->data = NULL;
	data->length = 0;
	return EINVAL;
    }

    {
	unsigned char *p = data->data;
	while(*p == 0 && len > 0) {
	    p++;
	    len--;
	}
	data->length = len;
	memmove(data->data, p, len);
    }
    return 0;
}

int
der_print_hex_heim_integer (const heim_integer *data, char **p)
{
    ssize_t len;
    char *q;

    len = hex_encode(data->data, data->length, p);
    if (len < 0)
	return ENOMEM;

    if (data->negative) {
	len = asprintf(&q, "-%s", *p);
	free(*p);
	if (len < 0)
	    return ENOMEM;
	*p = q;
    }
    return 0;
}