/* $Id$
 *
 * Copyright (C) 2006-2007 VozTelecom Sistemas S.L
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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
 */

/*
 * =====================================================================================
 *
 *        Filename:  encode_content_length.c
 *
 *     Description:  Function to encode content-length headers.
 *
 *         Version:  1.0
 *         Created:  21/11/05 02:02:58 CET
 *        Revision:  none
 *        Compiler:  gcc
 *
 *          Author:  Elias Baixas (EB), elias@conillera.net
 *         Company:  VozTele.com
 *
 * =====================================================================================
 */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>

/*
 * Encodes a content-length header.
 * encoding is as follows:
 * 1: length of the payload.
 * N: Network-Byte-Ordered(little endian) of the
 * multibyte number representing the length (now, it is
 * a long integer)
 */
int encode_contentlength(char *hdr, int hdrlen, long int len, char *where)
{
	long int longint;

	longint = htonl(len);
	where[0] = sizeof(long int);
	memcpy(&where[1], &longint, sizeof(long int));
	return 1 + sizeof(long int);
}

int print_encoded_contentlength(FILE *fd, char *hdr, int hdrlen,
		unsigned char *payload, int paylen, char *prefix)
{
	long int content_length;
	int i;

	memcpy(&content_length, &payload[1], payload[0]);
	content_length = ntohl(content_length);

	fprintf(fd, "%s", prefix);
	for(i = 0; i < paylen; i++)
		fprintf(fd, "%s%d%s", i == 0 ? "ENCODED CONTENT LENGTH BODY:[" : ":",
				payload[i], i == paylen - 1 ? "]\n" : "");
	fprintf(fd, "%s  CONTENT LENGTH=[%d]\n", prefix, (int)content_length);
	return 1;
}
