+++ /dev/null
-/*
- * xxHash - Extremely Fast Hash algorithm
- * Copyright (C) 2012-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at:
- * - xxHash homepage: https://cyan4973.github.io/xxHash/
- * - xxHash source repository: https://github.com/Cyan4973/xxHash
- */
-
-/*
- * Notice extracted from xxHash homepage:
- *
- * xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
- * It also successfully passes all tests from the SMHasher suite.
- *
- * Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2
- * Duo @3GHz)
- *
- * Name Speed Q.Score Author
- * xxHash 5.4 GB/s 10
- * CrapWow 3.2 GB/s 2 Andrew
- * MumurHash 3a 2.7 GB/s 10 Austin Appleby
- * SpookyHash 2.0 GB/s 10 Bob Jenkins
- * SBox 1.4 GB/s 9 Bret Mulvey
- * Lookup3 1.2 GB/s 9 Bob Jenkins
- * SuperFastHash 1.2 GB/s 1 Paul Hsieh
- * CityHash64 1.05 GB/s 10 Pike & Alakuijala
- * FNV 0.55 GB/s 5 Fowler, Noll, Vo
- * CRC32 0.43 GB/s 9
- * MD5-32 0.33 GB/s 10 Ronald L. Rivest
- * SHA1-32 0.28 GB/s 10
- *
- * Q.Score is a measure of quality of the hash function.
- * It depends on successfully passing SMHasher test set.
- * 10 is a perfect score.
- *
- * A 64-bits version, named xxh64 offers much better speed,
- * but for 64-bits applications only.
- * Name Speed on 64 bits Speed on 32 bits
- * xxh64 13.8 GB/s 1.9 GB/s
- * xxh32 6.8 GB/s 6.0 GB/s
- */
-
-#ifndef XXHASH_H
-#define XXHASH_H
-
-#include <linux/types.h>
-
-/*-****************************
- * Simple Hash Functions
- *****************************/
-
-/**
- * xxh32() - calculate the 32-bit hash of the input with a given seed.
- *
- * @input: The data to hash.
- * @length: The length of the data to hash.
- * @seed: The seed can be used to alter the result predictably.
- *
- * Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
- *
- * Return: The 32-bit hash of the data.
- */
-uint32_t xxh32(const void *input, size_t length, uint32_t seed);
-
-/**
- * xxh64() - calculate the 64-bit hash of the input with a given seed.
- *
- * @input: The data to hash.
- * @length: The length of the data to hash.
- * @seed: The seed can be used to alter the result predictably.
- *
- * This function runs 2x faster on 64-bit systems, but slower on 32-bit systems.
- *
- * Return: The 64-bit hash of the data.
- */
-uint64_t xxh64(const void *input, size_t length, uint64_t seed);
-
-/**
- * xxhash() - calculate wordsize hash of the input with a given seed
- * @input: The data to hash.
- * @length: The length of the data to hash.
- * @seed: The seed can be used to alter the result predictably.
- *
- * If the hash does not need to be comparable between machines with
- * different word sizes, this function will call whichever of xxh32()
- * or xxh64() is faster.
- *
- * Return: wordsize hash of the data.
- */
-
-static inline unsigned long xxhash(const void *input, size_t length,
- uint64_t seed)
-{
-#if BITS_PER_LONG == 64
- return xxh64(input, length, seed);
-#else
- return xxh32(input, length, seed);
-#endif
-}
-
-/*-****************************
- * Streaming Hash Functions
- *****************************/
-
-/*
- * These definitions are only meant to allow allocation of XXH state
- * statically, on stack, or in a struct for example.
- * Do not use members directly.
- */
-
-/**
- * struct xxh32_state - private xxh32 state, do not use members directly
- */
-struct xxh32_state {
- uint32_t total_len_32;
- uint32_t large_len;
- uint32_t v1;
- uint32_t v2;
- uint32_t v3;
- uint32_t v4;
- uint32_t mem32[4];
- uint32_t memsize;
-};
-
-/**
- * struct xxh32_state - private xxh64 state, do not use members directly
- */
-struct xxh64_state {
- uint64_t total_len;
- uint64_t v1;
- uint64_t v2;
- uint64_t v3;
- uint64_t v4;
- uint64_t mem64[4];
- uint32_t memsize;
-};
-
-/**
- * xxh32_reset() - reset the xxh32 state to start a new hashing operation
- *
- * @state: The xxh32 state to reset.
- * @seed: Initialize the hash state with this seed.
- *
- * Call this function on any xxh32_state to prepare for a new hashing operation.
- */
-void xxh32_reset(struct xxh32_state *state, uint32_t seed);
-
-/**
- * xxh32_update() - hash the data given and update the xxh32 state
- *
- * @state: The xxh32 state to update.
- * @input: The data to hash.
- * @length: The length of the data to hash.
- *
- * After calling xxh32_reset() call xxh32_update() as many times as necessary.
- *
- * Return: Zero on success, otherwise an error code.
- */
-int xxh32_update(struct xxh32_state *state, const void *input, size_t length);
-
-/**
- * xxh32_digest() - produce the current xxh32 hash
- *
- * @state: Produce the current xxh32 hash of this state.
- *
- * A hash value can be produced at any time. It is still possible to continue
- * inserting input into the hash state after a call to xxh32_digest(), and
- * generate new hashes later on, by calling xxh32_digest() again.
- *
- * Return: The xxh32 hash stored in the state.
- */
-uint32_t xxh32_digest(const struct xxh32_state *state);
-
-/**
- * xxh64_reset() - reset the xxh64 state to start a new hashing operation
- *
- * @state: The xxh64 state to reset.
- * @seed: Initialize the hash state with this seed.
- */
-void xxh64_reset(struct xxh64_state *state, uint64_t seed);
-
-/**
- * xxh64_update() - hash the data given and update the xxh64 state
- * @state: The xxh64 state to update.
- * @input: The data to hash.
- * @length: The length of the data to hash.
- *
- * After calling xxh64_reset() call xxh64_update() as many times as necessary.
- *
- * Return: Zero on success, otherwise an error code.
- */
-int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
-
-/**
- * xxh64_digest() - produce the current xxh64 hash
- *
- * @state: Produce the current xxh64 hash of this state.
- *
- * A hash value can be produced at any time. It is still possible to continue
- * inserting input into the hash state after a call to xxh64_digest(), and
- * generate new hashes later on, by calling xxh64_digest() again.
- *
- * Return: The xxh64 hash stored in the state.
- */
-uint64_t xxh64_digest(const struct xxh64_state *state);
-
-/*-**************************
- * Utils
- ***************************/
-
-/**
- * xxh32_copy_state() - copy the source state into the destination state
- *
- * @src: The source xxh32 state.
- * @dst: The destination xxh32 state.
- */
-void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src);
-
-/**
- * xxh64_copy_state() - copy the source state into the destination state
- *
- * @src: The source xxh64 state.
- * @dst: The destination xxh64 state.
- */
-void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src);
-
-#endif /* XXHASH_H */
projects / bcachefs-tools-debian / blobdiff