mirror of https://gerrit.osmocom.org/libosmocore
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/*! \file crc16.h
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* This was copied from the linux kernel and adjusted for our types.
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*/
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/*
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* crc16.h - CRC-16 routine
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*
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* Implements the standard CRC-16:
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* Width 16
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* Poly 0x8005 (x^16 + x^15 + x^2 + 1)
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* Init 0
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*
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* Copyright (c) 2005 Ben Gardner <bgardner@wabtec.com>
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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#pragma once
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#include <stdint.h>
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#include <sys/types.h>
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extern uint16_t const osmo_crc16_table[256];
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extern uint16_t osmo_crc16(uint16_t crc, const uint8_t *buffer, size_t len);
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static inline uint16_t osmo_crc16_byte(uint16_t crc, const uint8_t data)
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{
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return (crc >> 8) ^ osmo_crc16_table[(crc ^ data) & 0xff];
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}
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/* CCITT polynome 0x8408. This corresponds to x^0 + x^5 + x^12 */
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extern uint16_t const osmo_crc16_ccitt_table[256];
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extern uint16_t osmo_crc16_ccitt(uint16_t crc, const uint8_t *buffer, size_t len);
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static inline uint16_t osmo_crc16_ccitt_byte(uint16_t crc, const uint8_t data)
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{
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return (crc >> 8) ^ osmo_crc16_ccitt_table[(crc ^ data) & 0xff];
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}
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