diff options
Diffstat (limited to 'c_src/linux/xxhash.c')
-rw-r--r-- | c_src/linux/xxhash.c | 500 |
1 files changed, 0 insertions, 500 deletions
diff --git a/c_src/linux/xxhash.c b/c_src/linux/xxhash.c deleted file mode 100644 index d5bb9ff1..00000000 --- a/c_src/linux/xxhash.c +++ /dev/null @@ -1,500 +0,0 @@ -/* - * 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) ((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"); |