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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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/**********************************************************************************************
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* File: convcoder.h
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*
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* Description: Cyclic Redundancy Check
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* LTE requires CRC lengths 8, 16, 24A and 24B, each with it's own generator
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* polynomial.
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*
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* Reference: 3GPP TS 36.212 version 10.0.0 Release 10 Sec. 5.1.1
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*********************************************************************************************/
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#ifndef SRSRAN_CRC_H
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#define SRSRAN_CRC_H
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#include "srsran/config.h"
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#include <stdbool.h>
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#include <stdint.h>
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typedef struct SRSRAN_API {
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uint64_t table[256];
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int polynom;
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int order;
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uint64_t crcinit;
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uint64_t crcmask;
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uint64_t crchighbit;
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uint32_t srsran_crc_out;
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} srsran_crc_t;
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SRSRAN_API int srsran_crc_init(srsran_crc_t* h, uint32_t srsran_crc_poly, int srsran_crc_order);
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SRSRAN_API int srsran_crc_set_init(srsran_crc_t* h, uint64_t init_value);
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SRSRAN_API uint32_t srsran_crc_attach(srsran_crc_t* h, uint8_t* data, int len);
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SRSRAN_API uint32_t srsran_crc_attach_byte(srsran_crc_t* h, uint8_t* data, int len);
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static inline void srsran_crc_checksum_put_byte(srsran_crc_t* h, uint8_t byte)
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{
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uint64_t crc = h->crcinit;
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uint32_t idx;
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if (h->order > 8) {
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// For more than 8 bits
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uint32_t ord = h->order - 8U;
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idx = ((crc >> (ord)) & 0xffU) ^ byte;
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} else {
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// For 8 bits or less
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uint32_t ord = 8U - h->order;
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idx = ((crc << (ord)) & 0xffU) ^ byte;
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}
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crc = (crc << 8U) ^ h->table[idx];
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h->crcinit = crc;
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}
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static inline uint64_t srsran_crc_checksum_get(srsran_crc_t* h)
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{
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return (h->crcinit & h->crcmask);
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}
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SRSRAN_API uint32_t srsran_crc_checksum_byte(srsran_crc_t* h, const uint8_t* data, int len);
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SRSRAN_API uint32_t srsran_crc_checksum(srsran_crc_t* h, uint8_t* data, int len);
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SRSRAN_API bool srsran_crc_match(srsran_crc_t* h, uint8_t* data, int len);
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#endif // SRSRAN_CRC_H
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