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56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
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/*
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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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namespace folly { namespace detail {
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/**
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* Compute a CRC-32C checksum of a buffer using a hardware-accelerated
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* implementation.
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*
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* @note This function is exposed to support special cases where the
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* calling code is absolutely certain it ought to invoke a hardware-
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* accelerated CRC-32C implementation - unit tests, for example. For
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* all other scenarios, please call crc32c() and let it pick an
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* implementation based on the capabilities of the underlying CPU.
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*/
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uint32_t crc32c_hw(const uint8_t* data, size_t nbytes,
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uint32_t startingChecksum = ~0U);
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/**
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* Check whether a hardware-accelerated CRC-32C implementation is
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* supported on the current CPU.
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*/
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bool crc32c_hw_supported();
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/**
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* Compute a CRC-32C checksum of a buffer using a portable,
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* software-only implementation.
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*
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* @note This function is exposed to support special cases where the
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* calling code is absolutely certain it wants to use the software
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* implementation instead of the hardware-accelerated code - unit
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* tests, for example. For all other scenarios, please call crc32c()
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* and let it pick an implementation based on the capabilities of
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* the underlying CPU.
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*/
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uint32_t crc32c_sw(const uint8_t* data, size_t nbytes,
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uint32_t startingChecksum = ~0U);
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}} // folly::detail
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