46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef NOS_TRANSPORT_CRC16_H
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#define NOS_TRANSPORT_CRC16_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Calculate the CRC-16 of the data.
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*
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* This uses the CRC-16-IBM variant: 0x8005 (x^16 + x^15 + x^2 + 1)
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*/
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uint16_t crc16(const void *buf, uint32_t len);
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/**
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* Calculates the CRC-16 of the data to extend the given crc.
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*
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* CRC is a linear function so crc16( x | y ) == crc16(x, crc16(y)).
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*
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* This uses the CRC-16-IBM variant: 0x8005 (x^16 + x^15 + x^2 + 1)
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*/
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uint16_t crc16_update(const void *buf, uint32_t len, uint16_t crc);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NOS_TRANSPORT_CRC16_H */
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