linux/lib/xxhash.c

/*
 * 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
 */

#include <asm/unaligned.h>
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/xxhash.h>

/*-*************************************
 * Macros
 **************************************/
#define xxh_rotl32(x, r) …
#define xxh_rotl64(x, r) …

#ifdef __LITTLE_ENDIAN
#define XXH_CPU_LITTLE_ENDIAN …
#else
#define XXH_CPU_LITTLE_ENDIAN …
#endif

/*-*************************************
 * Constants
 **************************************/
static const uint32_t PRIME32_1 = …;
static const uint32_t PRIME32_2 = …;
static const uint32_t PRIME32_3 = …;
static const uint32_t PRIME32_4 = …;
static const uint32_t PRIME32_5 = …;

static const uint64_t PRIME64_1 = …;
static const uint64_t PRIME64_2 = …;
static const uint64_t PRIME64_3 = …;
static const uint64_t PRIME64_4 = …;
static const uint64_t PRIME64_5 = …;

/*-**************************
 *  Utils
 ***************************/
void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
{ … }
EXPORT_SYMBOL(…);

void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
{ … }
EXPORT_SYMBOL(…);

/*-***************************
 * Simple Hash Functions
 ****************************/
static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
{ … }

uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
{ … }
EXPORT_SYMBOL(…);

static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
{ … }

static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
{ … }

uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
{ … }
EXPORT_SYMBOL(…);

/*-**************************************************
 * Advanced Hash Functions
 ***************************************************/
void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
{ … }
EXPORT_SYMBOL(…);

void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
{ … }
EXPORT_SYMBOL(…);

int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
{ … }
EXPORT_SYMBOL(…);

uint32_t xxh32_digest(const struct xxh32_state *state)
{ … }
EXPORT_SYMBOL(…);

int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
{ … }
EXPORT_SYMBOL(…);

uint64_t xxh64_digest(const struct xxh64_state *state)
{ … }
EXPORT_SYMBOL(…);

MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;