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-rw-r--r--src/zstd/contrib/linux-kernel/0001-lib-Add-xxhash-module.patch862
1 files changed, 862 insertions, 0 deletions
diff --git a/src/zstd/contrib/linux-kernel/0001-lib-Add-xxhash-module.patch b/src/zstd/contrib/linux-kernel/0001-lib-Add-xxhash-module.patch
new file mode 100644
index 00000000..83f09924
--- /dev/null
+++ b/src/zstd/contrib/linux-kernel/0001-lib-Add-xxhash-module.patch
@@ -0,0 +1,862 @@
+From a4b1ffb6e89bbccd519f9afa0910635668436105 Mon Sep 17 00:00:00 2001
+From: Nick Terrell <terrelln@fb.com>
+Date: Mon, 17 Jul 2017 17:07:18 -0700
+Subject: [PATCH v5 1/5] lib: Add xxhash module
+
+Adds xxhash kernel module with xxh32 and xxh64 hashes. xxhash is an
+extremely fast non-cryptographic hash algorithm for checksumming.
+The zstd compression and decompression modules added in the next patch
+require xxhash. I extracted it out from zstd since it is useful on its
+own. I copied the code from the upstream XXHash source repository and
+translated it into kernel style. I ran benchmarks and tests in the kernel
+and tests in userland.
+
+I benchmarked xxhash as a special character device. I ran in four modes,
+no-op, xxh32, xxh64, and crc32. The no-op mode simply copies the data to
+kernel space and ignores it. The xxh32, xxh64, and crc32 modes compute
+hashes on the copied data. I also ran it with four different buffer sizes.
+The benchmark file is located in the upstream zstd source repository under
+`contrib/linux-kernel/xxhash_test.c` [1].
+
+I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
+The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
+16 GB of RAM, and a SSD. I benchmarked using the file `filesystem.squashfs`
+from `ubuntu-16.10-desktop-amd64.iso`, which is 1,536,217,088 B large.
+Run the following commands for the benchmark:
+
+ modprobe xxhash_test
+ mknod xxhash_test c 245 0
+ time cp filesystem.squashfs xxhash_test
+
+The time is reported by the time of the userland `cp`.
+The GB/s is computed with
+
+ 1,536,217,008 B / time(buffer size, hash)
+
+which includes the time to copy from userland.
+The Normalized GB/s is computed with
+
+ 1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)).
+
+
+| Buffer Size (B) | Hash | Time (s) | GB/s | Adjusted GB/s |
+|-----------------|-------|----------|------|---------------|
+| 1024 | none | 0.408 | 3.77 | - |
+| 1024 | xxh32 | 0.649 | 2.37 | 6.37 |
+| 1024 | xxh64 | 0.542 | 2.83 | 11.46 |
+| 1024 | crc32 | 1.290 | 1.19 | 1.74 |
+| 4096 | none | 0.380 | 4.04 | - |
+| 4096 | xxh32 | 0.645 | 2.38 | 5.79 |
+| 4096 | xxh64 | 0.500 | 3.07 | 12.80 |
+| 4096 | crc32 | 1.168 | 1.32 | 1.95 |
+| 8192 | none | 0.351 | 4.38 | - |
+| 8192 | xxh32 | 0.614 | 2.50 | 5.84 |
+| 8192 | xxh64 | 0.464 | 3.31 | 13.60 |
+| 8192 | crc32 | 1.163 | 1.32 | 1.89 |
+| 16384 | none | 0.346 | 4.43 | - |
+| 16384 | xxh32 | 0.590 | 2.60 | 6.30 |
+| 16384 | xxh64 | 0.466 | 3.30 | 12.80 |
+| 16384 | crc32 | 1.183 | 1.30 | 1.84 |
+
+Tested in userland using the test-suite in the zstd repo under
+`contrib/linux-kernel/test/XXHashUserlandTest.cpp` [2] by mocking the
+kernel functions. A line in each branch of every function in `xxhash.c`
+was commented out to ensure that the test-suite fails. Additionally
+tested while testing zstd and with SMHasher [3].
+
+[1] https://phabricator.intern.facebook.com/P57526246
+[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/XXHashUserlandTest.cpp
+[3] https://github.com/aappleby/smhasher
+
+zstd source repository: https://github.com/facebook/zstd
+XXHash source repository: https://github.com/cyan4973/xxhash
+
+Signed-off-by: Nick Terrell <terrelln@fb.com>
+---
+v1 -> v2:
+- Make pointer in lib/xxhash.c:394 non-const
+
+ include/linux/xxhash.h | 236 +++++++++++++++++++++++
+ lib/Kconfig | 3 +
+ lib/Makefile | 1 +
+ lib/xxhash.c | 500 +++++++++++++++++++++++++++++++++++++++++++++++++
+ 4 files changed, 740 insertions(+)
+ create mode 100644 include/linux/xxhash.h
+ create mode 100644 lib/xxhash.c
+
+diff --git a/include/linux/xxhash.h b/include/linux/xxhash.h
+new file mode 100644
+index 0000000..9e1f42c
+--- /dev/null
++++ b/include/linux/xxhash.h
+@@ -0,0 +1,236 @@
++/*
++ * 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: http://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);
++
++/*-****************************
++ * 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 */
+diff --git a/lib/Kconfig b/lib/Kconfig
+index 6762529..5e7541f 100644
+--- a/lib/Kconfig
++++ b/lib/Kconfig
+@@ -192,6 +192,9 @@ config CRC8
+ when they need to do cyclic redundancy check according CRC8
+ algorithm. Module will be called crc8.
+
++config XXHASH
++ tristate
++
+ config AUDIT_GENERIC
+ bool
+ depends on AUDIT && !AUDIT_ARCH
+diff --git a/lib/Makefile b/lib/Makefile
+index 40c1837..d06b68a 100644
+--- a/lib/Makefile
++++ b/lib/Makefile
+@@ -102,6 +102,7 @@ obj-$(CONFIG_CRC4) += crc4.o
+ obj-$(CONFIG_CRC7) += crc7.o
+ obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
+ obj-$(CONFIG_CRC8) += crc8.o
++obj-$(CONFIG_XXHASH) += xxhash.o
+ obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
+
+ obj-$(CONFIG_842_COMPRESS) += 842/
+diff --git a/lib/xxhash.c b/lib/xxhash.c
+new file mode 100644
+index 0000000..aa61e2a
+--- /dev/null
++++ b/lib/xxhash.c
+@@ -0,0 +1,500 @@
++/*
++ * 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: http://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) ((x << r) | (x >> (32 - r)))
++#define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r)))
++
++#ifdef __LITTLE_ENDIAN
++# define XXH_CPU_LITTLE_ENDIAN 1
++#else
++# define XXH_CPU_LITTLE_ENDIAN 0
++#endif
++
++/*-*************************************
++ * Constants
++ **************************************/
++static const uint32_t PRIME32_1 = 2654435761U;
++static const uint32_t PRIME32_2 = 2246822519U;
++static const uint32_t PRIME32_3 = 3266489917U;
++static const uint32_t PRIME32_4 = 668265263U;
++static const uint32_t PRIME32_5 = 374761393U;
++
++static const uint64_t PRIME64_1 = 11400714785074694791ULL;
++static const uint64_t PRIME64_2 = 14029467366897019727ULL;
++static const uint64_t PRIME64_3 = 1609587929392839161ULL;
++static const uint64_t PRIME64_4 = 9650029242287828579ULL;
++static const uint64_t PRIME64_5 = 2870177450012600261ULL;
++
++/*-**************************
++ * Utils
++ ***************************/
++void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
++{
++ memcpy(dst, src, sizeof(*dst));
++}
++EXPORT_SYMBOL(xxh32_copy_state);
++
++void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
++{
++ memcpy(dst, src, sizeof(*dst));
++}
++EXPORT_SYMBOL(xxh64_copy_state);
++
++/*-***************************
++ * Simple Hash Functions
++ ****************************/
++static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
++{
++ seed += input * PRIME32_2;
++ seed = xxh_rotl32(seed, 13);
++ seed *= PRIME32_1;
++ return seed;
++}
++
++uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
++{
++ const uint8_t *p = (const uint8_t *)input;
++ const uint8_t *b_end = p + len;
++ uint32_t h32;
++
++ if (len >= 16) {
++ const uint8_t *const limit = b_end - 16;
++ uint32_t v1 = seed + PRIME32_1 + PRIME32_2;
++ uint32_t v2 = seed + PRIME32_2;
++ uint32_t v3 = seed + 0;
++ uint32_t v4 = seed - PRIME32_1;
++
++ do {
++ v1 = xxh32_round(v1, get_unaligned_le32(p));
++ p += 4;
++ v2 = xxh32_round(v2, get_unaligned_le32(p));
++ p += 4;
++ v3 = xxh32_round(v3, get_unaligned_le32(p));
++ p += 4;
++ v4 = xxh32_round(v4, get_unaligned_le32(p));
++ p += 4;
++ } while (p <= limit);
++
++ h32 = xxh_rotl32(v1, 1) + xxh_rotl32(v2, 7) +
++ xxh_rotl32(v3, 12) + xxh_rotl32(v4, 18);
++ } else {
++ h32 = seed + PRIME32_5;
++ }
++
++ h32 += (uint32_t)len;
++
++ while (p + 4 <= b_end) {
++ h32 += get_unaligned_le32(p) * PRIME32_3;
++ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
++ p += 4;
++ }
++
++ while (p < b_end) {
++ h32 += (*p) * PRIME32_5;
++ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
++ p++;
++ }
++
++ h32 ^= h32 >> 15;
++ h32 *= PRIME32_2;
++ h32 ^= h32 >> 13;
++ h32 *= PRIME32_3;
++ h32 ^= h32 >> 16;
++
++ return h32;
++}
++EXPORT_SYMBOL(xxh32);
++
++static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
++{
++ acc += input * PRIME64_2;
++ acc = xxh_rotl64(acc, 31);
++ acc *= PRIME64_1;
++ return acc;
++}
++
++static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
++{
++ val = xxh64_round(0, val);
++ acc ^= val;
++ acc = acc * PRIME64_1 + PRIME64_4;
++ return acc;
++}
++
++uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
++{
++ const uint8_t *p = (const uint8_t *)input;
++ const uint8_t *const b_end = p + len;
++ uint64_t h64;
++
++ if (len >= 32) {
++ const uint8_t *const limit = b_end - 32;
++ uint64_t v1 = seed + PRIME64_1 + PRIME64_2;
++ uint64_t v2 = seed + PRIME64_2;
++ uint64_t v3 = seed + 0;
++ uint64_t v4 = seed - PRIME64_1;
++
++ do {
++ v1 = xxh64_round(v1, get_unaligned_le64(p));
++ p += 8;
++ v2 = xxh64_round(v2, get_unaligned_le64(p));
++ p += 8;
++ v3 = xxh64_round(v3, get_unaligned_le64(p));
++ p += 8;
++ v4 = xxh64_round(v4, get_unaligned_le64(p));
++ p += 8;
++ } while (p <= limit);
++
++ h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
++ xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
++ h64 = xxh64_merge_round(h64, v1);
++ h64 = xxh64_merge_round(h64, v2);
++ h64 = xxh64_merge_round(h64, v3);
++ h64 = xxh64_merge_round(h64, v4);
++
++ } else {
++ h64 = seed + PRIME64_5;
++ }
++
++ h64 += (uint64_t)len;
++
++ while (p + 8 <= b_end) {
++ const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
++
++ h64 ^= k1;
++ h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
++ p += 8;
++ }
++
++ if (p + 4 <= b_end) {
++ h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
++ h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
++ p += 4;
++ }
++
++ while (p < b_end) {
++ h64 ^= (*p) * PRIME64_5;
++ h64 = xxh_rotl64(h64, 11) * PRIME64_1;
++ p++;
++ }
++
++ h64 ^= h64 >> 33;
++ h64 *= PRIME64_2;
++ h64 ^= h64 >> 29;
++ h64 *= PRIME64_3;
++ h64 ^= h64 >> 32;
++
++ return h64;
++}
++EXPORT_SYMBOL(xxh64);
++
++/*-**************************************************
++ * Advanced Hash Functions
++ ***************************************************/
++void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
++{
++ /* use a local state for memcpy() to avoid strict-aliasing warnings */
++ struct xxh32_state state;
++
++ memset(&state, 0, sizeof(state));
++ state.v1 = seed + PRIME32_1 + PRIME32_2;
++ state.v2 = seed + PRIME32_2;
++ state.v3 = seed + 0;
++ state.v4 = seed - PRIME32_1;
++ memcpy(statePtr, &state, sizeof(state));
++}
++EXPORT_SYMBOL(xxh32_reset);
++
++void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
++{
++ /* use a local state for memcpy() to avoid strict-aliasing warnings */
++ struct xxh64_state state;
++
++ memset(&state, 0, sizeof(state));
++ state.v1 = seed + PRIME64_1 + PRIME64_2;
++ state.v2 = seed + PRIME64_2;
++ state.v3 = seed + 0;
++ state.v4 = seed - PRIME64_1;
++ memcpy(statePtr, &state, sizeof(state));
++}
++EXPORT_SYMBOL(xxh64_reset);
++
++int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
++{
++ const uint8_t *p = (const uint8_t *)input;
++ const uint8_t *const b_end = p + len;
++
++ if (input == NULL)
++ return -EINVAL;
++
++ state->total_len_32 += (uint32_t)len;
++ state->large_len |= (len >= 16) | (state->total_len_32 >= 16);
++
++ if (state->memsize + len < 16) { /* fill in tmp buffer */
++ memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
++ state->memsize += (uint32_t)len;
++ return 0;
++ }
++
++ if (state->memsize) { /* some data left from previous update */
++ const uint32_t *p32 = state->mem32;
++
++ memcpy((uint8_t *)(state->mem32) + state->memsize, input,
++ 16 - state->memsize);
++
++ state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
++ p32++;
++ state->v2 = xxh32_round(state->v2, get_unaligned_le32(p32));
++ p32++;
++ state->v3 = xxh32_round(state->v3, get_unaligned_le32(p32));
++ p32++;
++ state->v4 = xxh32_round(state->v4, get_unaligned_le32(p32));
++ p32++;
++
++ p += 16-state->memsize;
++ state->memsize = 0;
++ }
++
++ if (p <= b_end - 16) {
++ const uint8_t *const limit = b_end - 16;
++ uint32_t v1 = state->v1;
++ uint32_t v2 = state->v2;
++ uint32_t v3 = state->v3;
++ uint32_t v4 = state->v4;
++
++ do {
++ v1 = xxh32_round(v1, get_unaligned_le32(p));
++ p += 4;
++ v2 = xxh32_round(v2, get_unaligned_le32(p));
++ p += 4;
++ v3 = xxh32_round(v3, get_unaligned_le32(p));
++ p += 4;
++ v4 = xxh32_round(v4, get_unaligned_le32(p));
++ p += 4;
++ } while (p <= limit);
++
++ state->v1 = v1;
++ state->v2 = v2;
++ state->v3 = v3;
++ state->v4 = v4;
++ }
++
++ if (p < b_end) {
++ memcpy(state->mem32, p, (size_t)(b_end-p));
++ state->memsize = (uint32_t)(b_end-p);
++ }
++
++ return 0;
++}
++EXPORT_SYMBOL(xxh32_update);
++
++uint32_t xxh32_digest(const struct xxh32_state *state)
++{
++ const uint8_t *p = (const uint8_t *)state->mem32;
++ const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
++ state->memsize;
++ uint32_t h32;
++
++ if (state->large_len) {
++ h32 = xxh_rotl32(state->v1, 1) + xxh_rotl32(state->v2, 7) +
++ xxh_rotl32(state->v3, 12) + xxh_rotl32(state->v4, 18);
++ } else {
++ h32 = state->v3 /* == seed */ + PRIME32_5;
++ }
++
++ h32 += state->total_len_32;
++
++ while (p + 4 <= b_end) {
++ h32 += get_unaligned_le32(p) * PRIME32_3;
++ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
++ p += 4;
++ }
++
++ while (p < b_end) {
++ h32 += (*p) * PRIME32_5;
++ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
++ p++;
++ }
++
++ h32 ^= h32 >> 15;
++ h32 *= PRIME32_2;
++ h32 ^= h32 >> 13;
++ h32 *= PRIME32_3;
++ h32 ^= h32 >> 16;
++
++ return h32;
++}
++EXPORT_SYMBOL(xxh32_digest);
++
++int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
++{
++ const uint8_t *p = (const uint8_t *)input;
++ const uint8_t *const b_end = p + len;
++
++ if (input == NULL)
++ return -EINVAL;
++
++ state->total_len += len;
++
++ if (state->memsize + len < 32) { /* fill in tmp buffer */
++ memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
++ state->memsize += (uint32_t)len;
++ return 0;
++ }
++
++ if (state->memsize) { /* tmp buffer is full */
++ uint64_t *p64 = state->mem64;
++
++ memcpy(((uint8_t *)p64) + state->memsize, input,
++ 32 - state->memsize);
++
++ state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
++ p64++;
++ state->v2 = xxh64_round(state->v2, get_unaligned_le64(p64));
++ p64++;
++ state->v3 = xxh64_round(state->v3, get_unaligned_le64(p64));
++ p64++;
++ state->v4 = xxh64_round(state->v4, get_unaligned_le64(p64));
++
++ p += 32 - state->memsize;
++ state->memsize = 0;
++ }
++
++ if (p + 32 <= b_end) {
++ const uint8_t *const limit = b_end - 32;
++ uint64_t v1 = state->v1;
++ uint64_t v2 = state->v2;
++ uint64_t v3 = state->v3;
++ uint64_t v4 = state->v4;
++
++ do {
++ v1 = xxh64_round(v1, get_unaligned_le64(p));
++ p += 8;
++ v2 = xxh64_round(v2, get_unaligned_le64(p));
++ p += 8;
++ v3 = xxh64_round(v3, get_unaligned_le64(p));
++ p += 8;
++ v4 = xxh64_round(v4, get_unaligned_le64(p));
++ p += 8;
++ } while (p <= limit);
++
++ state->v1 = v1;
++ state->v2 = v2;
++ state->v3 = v3;
++ state->v4 = v4;
++ }
++
++ if (p < b_end) {
++ memcpy(state->mem64, p, (size_t)(b_end-p));
++ state->memsize = (uint32_t)(b_end - p);
++ }
++
++ return 0;
++}
++EXPORT_SYMBOL(xxh64_update);
++
++uint64_t xxh64_digest(const struct xxh64_state *state)
++{
++ const uint8_t *p = (const uint8_t *)state->mem64;
++ const uint8_t *const b_end = (const uint8_t *)state->mem64 +
++ state->memsize;
++ uint64_t h64;
++
++ if (state->total_len >= 32) {
++ const uint64_t v1 = state->v1;
++ const uint64_t v2 = state->v2;
++ const uint64_t v3 = state->v3;
++ const uint64_t v4 = state->v4;
++
++ h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
++ xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
++ h64 = xxh64_merge_round(h64, v1);
++ h64 = xxh64_merge_round(h64, v2);
++ h64 = xxh64_merge_round(h64, v3);
++ h64 = xxh64_merge_round(h64, v4);
++ } else {
++ h64 = state->v3 + PRIME64_5;
++ }
++
++ h64 += (uint64_t)state->total_len;
++
++ while (p + 8 <= b_end) {
++ const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
++
++ h64 ^= k1;
++ h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
++ p += 8;
++ }
++
++ if (p + 4 <= b_end) {
++ h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
++ h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
++ p += 4;
++ }
++
++ while (p < b_end) {
++ h64 ^= (*p) * PRIME64_5;
++ h64 = xxh_rotl64(h64, 11) * PRIME64_1;
++ p++;
++ }
++
++ h64 ^= h64 >> 33;
++ h64 *= PRIME64_2;
++ h64 ^= h64 >> 29;
++ h64 *= PRIME64_3;
++ h64 ^= h64 >> 32;
++
++ return h64;
++}
++EXPORT_SYMBOL(xxh64_digest);
++
++MODULE_LICENSE("Dual BSD/GPL");
++MODULE_DESCRIPTION("xxHash");
+--
+2.9.3
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 10:22:46 +0000