/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1982, 1989, 1993
 *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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.
 *
 *      @(#)if_ethersubr.c      8.1 (Berkeley) 6/10/93
 * $FreeBSD$
 */

static inline u_int32_t
ether_crc32_le_update(u_int32_t crc, const u_int8_t *buf, size_t len)
{
        static const u_int32_t crctab[] = {
                0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
                0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
                0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
                0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
        };
        size_t i;

        for (i = 0; i < len; i++) {
                crc ^= buf[i];
                crc = (crc >> 4) ^ crctab[crc & 0xf];
                crc = (crc >> 4) ^ crctab[crc & 0xf];
        }

        return (crc);
}


static inline u_int32_t
ether_crc32_be_update(u_int32_t crc, const u_int8_t *buf, size_t len)
{
        static const u_int8_t rev[] = {
                0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
                0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf
        };
        static const u_int32_t crctab[] = {
                0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
                0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
                0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
                0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd
        };
        size_t i;
        u_int8_t data;

        for (i = 0; i < len; i++) {
                data = buf[i];
                crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data & 0xf]];
                crc = (crc << 4) ^ crctab[(crc >> 28) ^ rev[data >> 4]];
        }

        return (crc);
}