linux/lib/crc7.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *      crc7.c
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/crc7.h>


/*
 * Table for CRC-7 (polynomial x^7 + x^3 + 1).
 * This is a big-endian CRC (msbit is highest power of x),
 * aligned so the msbit of the byte is the x^6 coefficient
 * and the lsbit is not used.
 */
const u8 crc7_be_syndrome_table[256] = …;
EXPORT_SYMBOL(…);

/**
 * crc7_be - update the CRC7 for the data buffer
 * @crc:     previous CRC7 value
 * @buffer:  data pointer
 * @len:     number of bytes in the buffer
 * Context: any
 *
 * Returns the updated CRC7 value.
 * The CRC7 is left-aligned in the byte (the lsbit is always 0), as that
 * makes the computation easier, and all callers want it in that form.
 *
 */
u8 crc7_be(u8 crc, const u8 *buffer, size_t len)
{ … }
EXPORT_SYMBOL(…);

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;