mirror of https://gitee.com/bigwinds/arangodb
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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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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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_BASICS_HASHES_H
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#define ARANGODB_BASICS_HASHES_H 1
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#include "Basics/Common.h"
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/// @brief computes a FNV hash for blocks
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uint64_t TRI_FnvHashBlock(uint64_t, void const*, size_t);
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/// @brief computes a FNV hash for memory blobs
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uint64_t TRI_FnvHashPointer(void const*, size_t);
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/// @brief computes a FNV hash for strings
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uint64_t TRI_FnvHashString(char const*);
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/// @brief computes a initial FNV for blocks
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static constexpr uint64_t TRI_FnvHashBlockInitial() {
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return 0xcbf29ce484222325ULL;
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}
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/// @brief initial CRC32 value
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static constexpr uint32_t TRI_InitialCrc32() { return (0xffffffff); }
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/// @brief final CRC32 value
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static constexpr uint32_t TRI_FinalCrc32(uint32_t value) {
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return (value ^ 0xffffffff);
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}
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/// @brief CRC32 value of data block
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extern "C" {
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#if ENABLE_ASM_CRC32 == 1
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uint32_t TRI_BlockCrc32_SSE42(uint32_t, char const* data, size_t length);
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#endif
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uint32_t TRI_BlockCrc32_C(uint32_t hash, char const* data, size_t length);
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extern uint32_t (*TRI_BlockCrc32)(uint32_t hash, char const* data, size_t length);
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}
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/// @brief computes a CRC32 for memory blobs
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/// the polynomial used is 0x1EDC6F41.
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uint32_t TRI_Crc32HashPointer(void const*, size_t);
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/// @brief computes a CRC32 for strings
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/// the polynomial used is 0x1EDC6F41.
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uint32_t TRI_Crc32HashString(char const*);
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#endif
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