78 lines
1.1 KiB
C
78 lines
1.1 KiB
C
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#include <stdint.h>
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#include <osmocom/core/crcgen.h>
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#include "gsm0503_parity.h"
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/*
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* GSM (SACCH) parity (FIRE code)
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*
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* g(x) = (x^23 + 1)(x^17 + x^3 + 1)
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* = x^40 + x^26 + x^23 + x^17 + x^3 + a1
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*/
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const struct osmo_crc64gen_code gsm0503_fire_crc40 = {
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.bits = 40,
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.poly = 0x0004820009ULL,
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.init = 0x0000000000ULL,
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.remainder = 0xffffffffffULL,
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};
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/*
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* GSM PDTCH CS-2, CS-3, CS-4 parity
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*
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* g(x) = x^16 + x^12 + x^5 + 1
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*/
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const struct osmo_crc16gen_code gsm0503_cs234_crc16 = {
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.bits = 16,
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.poly = 0x1021,
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.init = 0x0000,
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.remainder = 0xffff,
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};
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/*
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* GSM RACH parity
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*
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* g(x) = x^6 + x^5 + x^3 + x^2 + x^1 + 1
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*/
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const struct osmo_crc8gen_code gsm0503_rach_crc6 = {
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.bits = 6,
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.poly = 0x2f,
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.init = 0x00,
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.remainder = 0x3f,
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};
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/*
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* GSM SCH parity
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*
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* g(x) = x^10 + x^8 + x^6 + x^5 + x^4 + x^2 + 1
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*/
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const struct osmo_crc16gen_code gsm0503_sch_crc10 = {
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.bits = 10,
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.poly = 0x175,
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.init = 0x000,
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.remainder = 0x3ff,
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};
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/*
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* GSM TCH FR/EFR parity
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*
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* g(x) = x^3 + x + 1
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*/
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const struct osmo_crc8gen_code gsm0503_tch_fr_crc3 = {
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.bits = 3,
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.poly = 0x3,
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.init = 0x0,
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.remainder = 0x7,
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};
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