/* SPDX-License-Identifier: BSD-2-Clause */ /* * xxHash - Extremely Fast Hash algorithm * Copyright (C) 2012-2016, Yann Collet. * * You can contact the author at: * - xxHash homepage: http://cyan4973.github.io/xxHash/ * - xxHash source repository: https://github.com/Cyan4973/xxHash */ #include <arch/byteorder.h> #include <endian.h> #include <string.h> #include <xxhash.h> /*-************************************* * Macros **************************************/ #define xxh_rotl32(x, r) ((x << r) | (x >> (32 - r))) #define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r))) /*-************************************* * 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)); } void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src) { memcpy(dst, src, sizeof(*dst)); } static uint32_t xxh_get_unaligned_le32(const void *p) { const uint32_t *p32 = (const uint32_t *)p; return le32toh(*p32); } static uint64_t xxh_get_unaligned_le64(const void *p) { const uint64_t *p64 = (const uint64_t *)p; return le64toh(*p64); } /*-*************************** * 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, xxh_get_unaligned_le32(p)); p += 4; v2 = xxh32_round(v2, xxh_get_unaligned_le32(p)); p += 4; v3 = xxh32_round(v3, xxh_get_unaligned_le32(p)); p += 4; v4 = xxh32_round(v4, xxh_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 += xxh_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; } 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, xxh_get_unaligned_le64(p)); p += 8; v2 = xxh64_round(v2, xxh_get_unaligned_le64(p)); p += 8; v3 = xxh64_round(v3, xxh_get_unaligned_le64(p)); p += 8; v4 = xxh64_round(v4, xxh_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, xxh_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)(xxh_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; } /*-************************************************** * 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)); } 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)); } 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 -1; 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, xxh_get_unaligned_le32(p32)); p32++; state->v2 = xxh32_round(state->v2, xxh_get_unaligned_le32(p32)); p32++; state->v3 = xxh32_round(state->v3, xxh_get_unaligned_le32(p32)); p32++; state->v4 = xxh32_round(state->v4, xxh_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, xxh_get_unaligned_le32(p)); p += 4; v2 = xxh32_round(v2, xxh_get_unaligned_le32(p)); p += 4; v3 = xxh32_round(v3, xxh_get_unaligned_le32(p)); p += 4; v4 = xxh32_round(v4, xxh_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; } 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 += xxh_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; } 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 -1; 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, xxh_get_unaligned_le64(p64)); p64++; state->v2 = xxh64_round(state->v2, xxh_get_unaligned_le64(p64)); p64++; state->v3 = xxh64_round(state->v3, xxh_get_unaligned_le64(p64)); p64++; state->v4 = xxh64_round(state->v4, xxh_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, xxh_get_unaligned_le64(p)); p += 8; v2 = xxh64_round(v2, xxh_get_unaligned_le64(p)); p += 8; v3 = xxh64_round(v3, xxh_get_unaligned_le64(p)); p += 8; v4 = xxh64_round(v4, xxh_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; } 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, xxh_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)(xxh_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; }