Cyclic Redundancy Check

Files
file	crc.h
	Osmocom GMR-1 CRC header.
file	crc.c
	Osmocom GMR-1 CRC implementation.

Functions
uint16_t	osmo_crc16 (uint16_t crc, uint8_t const *buffer, size_t len)
uint16_t	osmo_crc16_ccitt (uint16_t crc, uint8_t const *buffer, size_t len)
uint16_t	osmo_crc16gen_compute_bits (const struct osmo_crc16gen_code *code, const ubit_t *in, int len)
int	osmo_crc16gen_check_bits (const struct osmo_crc16gen_code *code, const ubit_t *in, int len, const ubit_t *crc_bits)
void	osmo_crc16gen_set_bits (const struct osmo_crc16gen_code *code, const ubit_t *in, int len, ubit_t *crc_bits)
uint32_t	osmo_crc32gen_compute_bits (const struct osmo_crc32gen_code *code, const ubit_t *in, int len)
int	osmo_crc32gen_check_bits (const struct osmo_crc32gen_code *code, const ubit_t *in, int len, const ubit_t *crc_bits)
void	osmo_crc32gen_set_bits (const struct osmo_crc32gen_code *code, const ubit_t *in, int len, ubit_t *crc_bits)
uint64_t	osmo_crc64gen_compute_bits (const struct osmo_crc64gen_code *code, const ubit_t *in, int len)
int	osmo_crc64gen_check_bits (const struct osmo_crc64gen_code *code, const ubit_t *in, int len, const ubit_t *crc_bits)
void	osmo_crc64gen_set_bits (const struct osmo_crc64gen_code *code, const ubit_t *in, int len, ubit_t *crc_bits)
uint8_t	osmo_crc8gen_compute_bits (const struct osmo_crc8gen_code *code, const ubit_t *in, int len)
int	osmo_crc8gen_check_bits (const struct osmo_crc8gen_code *code, const ubit_t *in, int len, const ubit_t *crc_bits)
void	osmo_crc8gen_set_bits (const struct osmo_crc8gen_code *code, const ubit_t *in, int len, ubit_t *crc_bits)

Variables
uint16_t const	osmo_crc16_table [256]
uint16_t const	osmo_crc16_ccitt_table [256]
uint16_t const	osmo_crc16_table [256]
uint16_t const	osmo_crc16_ccitt_table [256]
const struct osmo_crc8gen_code	gmr1_crc8
	GMR-1 CRC8 g8(D) = D8 + D7 + D4 + D3 + D + 1.
const struct osmo_crc16gen_code	gmr1_crc12
	GMR-1 CRC12 g12(D) = D12 + D11 + D3 + D2 + D + 1.
const struct osmo_crc16gen_code	gmr1_crc16
	GMR-1 CRC16 g16(D) = D16 + D12 + D5 + 1.
const struct osmo_crc8gen_code	gmr1_crc8
	GMR-1 CRC8 g8(D) = D8 + D7 + D4 + D3 + D + 1. More...
const struct osmo_crc16gen_code	gmr1_crc12
	GMR-1 CRC12 g12(D) = D12 + D11 + D3 + D2 + D + 1. More...
const struct osmo_crc16gen_code	gmr1_crc16
	GMR-1 CRC16 g16(D) = D16 + D12 + D5 + 1. More...

Detailed Description

Variable Documentation

gmr1_crc12

const struct osmo_crc16gen_code gmr1_crc12

Initial value:

= {
        .bits = 12,
        .poly = 0x80f,
        .init = 0x0000,
        .remainder = 0x0000,
}

GMR-1 CRC12 g12(D) = D12 + D11 + D3 + D2 + D + 1.

Referenced by gmr1_rach_encode().

gmr1_crc16

const struct osmo_crc16gen_code gmr1_crc16

Initial value:

= {
        .bits = 16,
        .poly = 0x1021,
        .init = 0x0000,
        .remainder = 0x0000,
}

GMR-1 CRC16 g16(D) = D16 + D12 + D5 + 1.

Referenced by gmr1_bcch_encode(), gmr1_ccch_encode(), gmr1_facch3_encode(), gmr1_facch9_encode(), and gmr1_xch_dc12_encode().

gmr1_crc8

const struct osmo_crc8gen_code gmr1_crc8

Initial value:

= {
        .bits = 8,
        .poly = 0x9b,
        .init = 0x00,
        .remainder = 0x00,
}

GMR-1 CRC8 g8(D) = D8 + D7 + D4 + D3 + D + 1.

Referenced by gmr1_rach_encode().