/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
/* Copyright (C) 2015-2017 Netronome Systems, Inc. */

#ifndef NFP_CRC32_H
#define NFP_CRC32_H

#include <linux/crc32.h>

/**
 * crc32_posix_end() - Finalize POSIX CRC32 working state
 * @crc:        Current CRC32 working state
 * @total_len:  Total length of data that was CRC32'd
 *
 * Return: Final POSIX CRC32 value
 */
static inline u32 crc32_posix_end(u32 crc, size_t total_len)
{
        /* Extend with the length of the string. */
        while (total_len != 0) {
                u8 c = total_len & 0xff;

                crc = crc32_be(crc, &c, 1);
                total_len >>= 8;
        }

        return ~crc;
}

static inline u32 crc32_posix(const void *buff, size_t len)
{
        return crc32_posix_end(crc32_be(0, buff, len), len);
}

#endif /* NFP_CRC32_H */