/*

 * This file is part of libbluray

 * Copyright (C) 2012  Petri Hintukainen <phintuka@users.sourceforge.net>

 *

 * 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, see

 * <http://www.gnu.org/licenses/>.

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include "util/bits.h"

#include "extdata_parse.h"

#include <stdint.h>

int bdmv_parse_extension_data(BITSTREAM *bits,

                              int start_address,

                              int (*handler)(BITSTREAM*, int, int, void*),

                              void *handle)

{

    int64_t length;

    int num_entries, n;

    if (start_address < 1) return 0;

    if (start_address > bits->end - 12) return 0;

    if (bs_seek_byte(bits, start_address) < 0) {

        return 0;

    }

    length      = bs_read(bits, 32); /* length of extension data block */

    if (length < 1) return 0;

    bs_skip(bits, 32); /* relative start address of extension data */

    bs_skip(bits, 24); /* padding */

    num_entries = bs_read(bits, 8);

    if (start_address > bits->end - 12 - num_entries * 12) return 0;

    for (n = 0; n < num_entries; n++) {

        uint16_t id1       = bs_read(bits, 16);

        uint16_t id2       = bs_read(bits, 16);

        int64_t  ext_start = bs_read(bits, 32);

        int64_t  ext_len   = bs_read(bits, 32);

        int64_t  saved_pos = bs_pos(bits) >> 3;

        if (ext_start + start_address + ext_len > bits->end) return 0;

        if (bs_seek_byte(bits, start_address + ext_start) >= 0) {

            (handler)(bits, id1, id2, handle);

        }

        if (bs_seek_byte(bits, saved_pos) < 0) {

            return 0;

        }

    }

    return 1;

}