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crc16.h
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/*
* crc16.h - CRC-16 routine
*
* Implements the standard CRC-16:
* - Width 16
* - Poly 0x8005 (x^16 + x^15 + x^2 + 1)
* - Init 0
*
* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
#pragma once
#include <stdint.h>
#include <sys/types.h>
extern uint16_t const osmo_crc16_table[256];
extern uint16_t osmo_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
static inline uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data)
{
return (crc >> 8) ^ osmo_crc16_table[(crc ^ data) & 0xff];
}
extern uint16_t const osmo_crc16_ccitt_table[256];
extern uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
static inline uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data)
{
return (crc >> 8) ^ osmo_crc16_ccitt_table[(crc ^ data) & 0xff];
}
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]
len
uint8_t len
buffer