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41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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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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#pragma once
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#include <stdint.h>
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#include <cstddef>
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/*
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* Checksum functions
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*/
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namespace folly {
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/**
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* Compute the CRC-32C checksum of a buffer, using a hardware-accelerated
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* implementation if available or a portable software implementation as
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* a default.
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*
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* @note CRC-32C is different from CRC-32; CRC-32C starts with a different
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* polynomial and thus yields different results for the same input
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* than a traditional CRC-32.
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*/
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uint32_t crc32c(const uint8_t* data, size_t nbytes,
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uint32_t startingChecksum = ~0U);
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} // folly
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