libosmocore 1.13.1.1-afb4 Osmocom core library

crc16.h
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1
7/*
8 * crc16.h - CRC-16 routine
9 *
10 * Implements the standard CRC-16:
11 * - Width 16
12 * - Poly 0x8005 (x^16 + x^15 + x^2 + 1)
13 * - Init 0
14 *
15 * Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
16 *
17 * This source code is licensed under the GNU General Public License,
18 * Version 2. See the file COPYING for more details.
19 */
20
21#pragma once
22
23#include <stdint.h>
24
25#include <sys/types.h>
26
27 extern uint16_t const osmo_crc16_table[256];
28
29 extern uint16_t osmo_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
30
32 static inline uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data)
33{
34 return (crc >> 8) ^ osmo_crc16_table[(crc ^ data) & 0xff];
35}
36
37
38
39 extern uint16_t const osmo_crc16_ccitt_table[256];
40
41 extern uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
42
44 static inline uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data)
45{
46 return (crc >> 8) ^ osmo_crc16_ccitt_table[(crc ^ data) & 0xff];
47}
48
len
static size_t len(const char *str)
osmo_crc16_byte
static uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data)
CRC-16 polynome 0x8005 (x^16 + x^15 + x^2 + 1)
Definition: crc16.h:32
osmo_crc16_table
uint16_t const osmo_crc16_table[256]
CRC table for the CRC-16.
Definition: crc16.c:19
osmo_crc16
uint16_t osmo_crc16(uint16_t crc, const uint8_t *buffer, size_t len)
Compute 16bit CCITT polynome 0x8408 (x^0 + x^5 + x^12) over given buffer.
Definition: crc16.c:60
osmo_crc16_ccitt
uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len)
Compute 16bit CCITT polynome 0x8408 (x^0 + x^5 + x^12) over given buffer.
Definition: crc16.c:109
osmo_crc16_ccitt_table
uint16_t const osmo_crc16_ccitt_table[256]
CRC table for the CCITT CRC-6.
Definition: crc16.c:68
osmo_crc16_ccitt_byte
static uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data)
CCITT polynome 0x8408 (x^0 + x^5 + x^12)
Definition: crc16.h:44
data
uint8_t data[0]
buffer