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86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/**
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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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 SRSLTE_CRC_H
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#define SRSLTE_CRC_H
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#include "srslte/config.h"
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#include <stdint.h>
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typedef struct SRSLTE_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 srslte_crc_out;
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} srslte_crc_t;
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SRSLTE_API int srslte_crc_init(srslte_crc_t* h, uint32_t srslte_crc_poly, int srslte_crc_order);
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SRSLTE_API int srslte_crc_set_init(srslte_crc_t* h, uint64_t init_value);
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SRSLTE_API uint32_t srslte_crc_attach(srslte_crc_t* h, uint8_t* data, int len);
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SRSLTE_API uint32_t srslte_crc_attach_byte(srslte_crc_t* h, uint8_t* data, int len);
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static inline void srslte_crc_checksum_put_byte(srslte_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 srslte_crc_checksum_get(srslte_crc_t* h)
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{
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return (h->crcinit & h->crcmask);
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}
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SRSLTE_API uint32_t srslte_crc_checksum_byte(srslte_crc_t* h, const uint8_t* data, int len);
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SRSLTE_API uint32_t srslte_crc_checksum(srslte_crc_t* h, uint8_t* data, int len);
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#endif // SRSLTE_CRC_H
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