d_udp_lite.h

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/*
 * This program 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.
 *
 * This program 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @file d_udp_lite.h
 * @brief ROHC decompression context for the UDP-Lite profile.
 * @author Didier Barvaux <didier.barvaux@toulouse.viveris.com>
 * @author The hackers from ROHC for Linux
 */

#ifndef D_UDP_LITE_H
#define D_UDP_LITE_H

#include <netinet/ip.h>
#include <netinet/udp.h>

#include "d_generic.h"
#include "d_udp.h"
#include "udp_lite.h"


/**
 * @brief Define the UDP-Lite part of the decompression profile context.
 *
 * This object must be used with the generic part of the decompression
 * context d_generic_context.
 *
 * @see d_generic_context
 */
struct d_udp_lite_context
{
        /**
         * @brief Whether the UDP-Lite checksum coverage field is present or not
         *
         * Possible values are:
         *   -1 if not initialized
         *    0 if not present
         *    1 if present
         */
        int cfp;

        /**
         * @brief Whether the UDP-Lite checksum coverage field can be inferred
         *        or not
         *
         * Possible values are:
         *   -1 if not initialized
         *    0 if not present
         *    1 if present
         */
        int cfi;

        /**
         * @brief Checksum Coverage Extension
         *
         * Possible values are:
         *  - 0 if not present
         *  - PACKET_CCE if present and ON
         *  - PACKET_CCE_OFF if present and OFF
         */
        int cce_packet;
};


/*
 * Public function prototypes.
 */

int udp_lite_decode_dynamic_udp(struct d_generic_context *context,
                                const unsigned char *packet,
                                unsigned int length,
                                unsigned char *dest);

int udp_lite_build_uncompressed_udp(struct d_generic_context *context,
                                    struct d_generic_changes *active,
                                    unsigned char *dest,
                                    int payload_size);


#endif