decomp/schemes/tcp_sack.h

Go to the documentation of this file.

/*
 * Copyright 2012,2013,2014 Didier Barvaux
 * Copyright 2013,2014 Viveris Technologies
 * Copyright 2012 WBX
 *
 * This library 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.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

/**
 * @file   decomp/schemes/tcp_sack.h
 * @brief  Handle decoding of TCP Selective ACKnowledgement (SACK) option
 * @author FWX <rohc_team@dialine.fr>
 * @author Didier Barvaux <didier@barvaux.org>
 */

#ifndef ROHC_DECOMP_SCHEMES_TCP_SACK_H
#define ROHC_DECOMP_SCHEMES_TCP_SACK_H

#include "rohc_decomp_internals.h"
#include "protocols/tcp.h"

#include <stdlib.h>
#include <stdint.h>

/** The context to parse and decode the TCP SACK option */
struct d_tcp_opt_sack
{
        sack_block_t blocks[TCP_SACK_BLOCKS_MAX_NR]; /**< The SACK blocks */
        uint8_t blocks_nr;                           /**< The number of SACK blocks */
        uint8_t unused[7];
};

/* compiler sanity check for C11-compliant compilers and GCC >= 4.6 */
#if ((defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
     (defined(__GNUC__) && defined(__GNUC_MINOR__) && \
      (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))))
_Static_assert((sizeof(struct d_tcp_opt_sack) % 8) == 0,
               "d_tcp_opt_sack length should be multiple of 8 bytes");
#endif


int d_tcp_sack_parse(const struct rohc_decomp_ctxt *const context,
                     const uint8_t *const data,
                     const size_t data_len,
                     struct d_tcp_opt_sack *const opt_sack)
        __attribute__((warn_unused_result, nonnull(1, 2, 4)));

#endif /* ROHC_DECOMP_SCHEMES_TCP_SACK_H */