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@@ -0,0 +1,467 @@
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+// SPDX-License-Identifier: (GPL-2.0 or BSD-2-Clause)
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+/*
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+ * xxHash - Extremely Fast Hash algorithm
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+ * Copyright (C) 2012-2016, Yann Collet.
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+ *
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+ * You can contact the author at:
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+ * - xxHash homepage: http://cyan4973.github.io/xxHash/
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+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
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+ */
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+
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+#include <asm/unaligned.h>
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+#include <linux/errno.h>
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+#include <linux/compiler.h>
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+#include <linux/kernel.h>
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+#include <linux/compat.h>
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+#include <linux/string.h>
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+#include <linux/xxhash.h>
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+
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+/*-*************************************
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+ * Macros
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+ **************************************/
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+#define xxh_rotl32(x, r) ((x << r) | (x >> (32 - r)))
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+#define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r)))
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+
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+#ifdef __LITTLE_ENDIAN
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+# define XXH_CPU_LITTLE_ENDIAN 1
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+#else
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+# define XXH_CPU_LITTLE_ENDIAN 0
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+#endif
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+
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+/*-*************************************
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+ * Constants
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+ **************************************/
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+static const uint32_t PRIME32_1 = 2654435761U;
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+static const uint32_t PRIME32_2 = 2246822519U;
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+static const uint32_t PRIME32_3 = 3266489917U;
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+static const uint32_t PRIME32_4 = 668265263U;
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+static const uint32_t PRIME32_5 = 374761393U;
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+
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+static const uint64_t PRIME64_1 = 11400714785074694791ULL;
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+static const uint64_t PRIME64_2 = 14029467366897019727ULL;
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+static const uint64_t PRIME64_3 = 1609587929392839161ULL;
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+static const uint64_t PRIME64_4 = 9650029242287828579ULL;
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+static const uint64_t PRIME64_5 = 2870177450012600261ULL;
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+
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+/*-**************************
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+ * Utils
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+ ***************************/
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+void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
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+{
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+ memcpy(dst, src, sizeof(*dst));
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+}
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+EXPORT_SYMBOL(xxh32_copy_state);
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+
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+void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
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+{
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+ memcpy(dst, src, sizeof(*dst));
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+}
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+EXPORT_SYMBOL(xxh64_copy_state);
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+
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+/*-***************************
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+ * Simple Hash Functions
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+ ****************************/
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+static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
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+{
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+ seed += input * PRIME32_2;
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+ seed = xxh_rotl32(seed, 13);
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+ seed *= PRIME32_1;
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+ return seed;
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+}
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+
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+uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
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+{
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+ const uint8_t *p = (const uint8_t *)input;
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+ const uint8_t *b_end = p + len;
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+ uint32_t h32;
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+
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+ if (len >= 16) {
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+ const uint8_t *const limit = b_end - 16;
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+ uint32_t v1 = seed + PRIME32_1 + PRIME32_2;
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+ uint32_t v2 = seed + PRIME32_2;
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+ uint32_t v3 = seed + 0;
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+ uint32_t v4 = seed - PRIME32_1;
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+
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+ do {
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+ v1 = xxh32_round(v1, get_unaligned_le32(p));
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+ p += 4;
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+ v2 = xxh32_round(v2, get_unaligned_le32(p));
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+ p += 4;
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+ v3 = xxh32_round(v3, get_unaligned_le32(p));
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+ p += 4;
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+ v4 = xxh32_round(v4, get_unaligned_le32(p));
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+ p += 4;
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+ } while (p <= limit);
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+
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+ h32 = xxh_rotl32(v1, 1) + xxh_rotl32(v2, 7) +
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+ xxh_rotl32(v3, 12) + xxh_rotl32(v4, 18);
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+ } else {
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+ h32 = seed + PRIME32_5;
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+ }
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+
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+ h32 += (uint32_t)len;
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+
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+ while (p + 4 <= b_end) {
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+ h32 += get_unaligned_le32(p) * PRIME32_3;
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+ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
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+ p += 4;
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+ }
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+
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+ while (p < b_end) {
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+ h32 += (*p) * PRIME32_5;
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+ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
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+ p++;
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+ }
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+
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+ h32 ^= h32 >> 15;
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+ h32 *= PRIME32_2;
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+ h32 ^= h32 >> 13;
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+ h32 *= PRIME32_3;
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+ h32 ^= h32 >> 16;
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+
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+ return h32;
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+}
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+EXPORT_SYMBOL(xxh32);
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+
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+static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
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+{
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+ acc += input * PRIME64_2;
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+ acc = xxh_rotl64(acc, 31);
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+ acc *= PRIME64_1;
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+ return acc;
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+}
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+
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+static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
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+{
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+ val = xxh64_round(0, val);
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+ acc ^= val;
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+ acc = acc * PRIME64_1 + PRIME64_4;
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+ return acc;
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+}
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+
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+uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
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+{
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+ const uint8_t *p = (const uint8_t *)input;
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+ const uint8_t *const b_end = p + len;
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+ uint64_t h64;
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+
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+ if (len >= 32) {
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+ const uint8_t *const limit = b_end - 32;
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+ uint64_t v1 = seed + PRIME64_1 + PRIME64_2;
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+ uint64_t v2 = seed + PRIME64_2;
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+ uint64_t v3 = seed + 0;
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+ uint64_t v4 = seed - PRIME64_1;
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+
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+ do {
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+ v1 = xxh64_round(v1, get_unaligned_le64(p));
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+ p += 8;
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+ v2 = xxh64_round(v2, get_unaligned_le64(p));
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+ p += 8;
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+ v3 = xxh64_round(v3, get_unaligned_le64(p));
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+ p += 8;
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+ v4 = xxh64_round(v4, get_unaligned_le64(p));
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+ p += 8;
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+ } while (p <= limit);
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+
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+ h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
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+ xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
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+ h64 = xxh64_merge_round(h64, v1);
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+ h64 = xxh64_merge_round(h64, v2);
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+ h64 = xxh64_merge_round(h64, v3);
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+ h64 = xxh64_merge_round(h64, v4);
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+
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+ } else {
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+ h64 = seed + PRIME64_5;
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+ }
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+
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+ h64 += (uint64_t)len;
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+
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+ while (p + 8 <= b_end) {
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+ const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
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+
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+ h64 ^= k1;
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+ h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
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+ p += 8;
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+ }
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+
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+ if (p + 4 <= b_end) {
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+ h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
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+ h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
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+ p += 4;
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+ }
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+
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+ while (p < b_end) {
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+ h64 ^= (*p) * PRIME64_5;
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+ h64 = xxh_rotl64(h64, 11) * PRIME64_1;
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+ p++;
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+ }
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+
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+ h64 ^= h64 >> 33;
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+ h64 *= PRIME64_2;
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+ h64 ^= h64 >> 29;
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+ h64 *= PRIME64_3;
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+ h64 ^= h64 >> 32;
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+
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+ return h64;
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+}
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+EXPORT_SYMBOL(xxh64);
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+
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+/*-**************************************************
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+ * Advanced Hash Functions
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+ ***************************************************/
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+void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
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+{
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+ /* use a local state for memcpy() to avoid strict-aliasing warnings */
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+ struct xxh32_state state;
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+
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+ memset(&state, 0, sizeof(state));
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+ state.v1 = seed + PRIME32_1 + PRIME32_2;
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+ state.v2 = seed + PRIME32_2;
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+ state.v3 = seed + 0;
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+ state.v4 = seed - PRIME32_1;
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+ memcpy(statePtr, &state, sizeof(state));
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+}
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+EXPORT_SYMBOL(xxh32_reset);
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+
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+void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
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+{
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+ /* use a local state for memcpy() to avoid strict-aliasing warnings */
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+ struct xxh64_state state;
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+
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+ memset(&state, 0, sizeof(state));
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+ state.v1 = seed + PRIME64_1 + PRIME64_2;
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+ state.v2 = seed + PRIME64_2;
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+ state.v3 = seed + 0;
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+ state.v4 = seed - PRIME64_1;
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+ memcpy(statePtr, &state, sizeof(state));
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+}
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+EXPORT_SYMBOL(xxh64_reset);
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+
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+int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
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+{
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+ const uint8_t *p = (const uint8_t *)input;
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+ const uint8_t *const b_end = p + len;
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+
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+ if (input == NULL)
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+ return -EINVAL;
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+
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+ state->total_len_32 += (uint32_t)len;
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+ state->large_len |= (len >= 16) | (state->total_len_32 >= 16);
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+
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+ if (state->memsize + len < 16) { /* fill in tmp buffer */
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+ memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
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+ state->memsize += (uint32_t)len;
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+ return 0;
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+ }
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+
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+ if (state->memsize) { /* some data left from previous update */
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+ const uint32_t *p32 = state->mem32;
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+
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+ memcpy((uint8_t *)(state->mem32) + state->memsize, input,
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+ 16 - state->memsize);
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+
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+ state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
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+ p32++;
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+ state->v2 = xxh32_round(state->v2, get_unaligned_le32(p32));
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+ p32++;
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+ state->v3 = xxh32_round(state->v3, get_unaligned_le32(p32));
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+ p32++;
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+ state->v4 = xxh32_round(state->v4, get_unaligned_le32(p32));
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+ p32++;
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+
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+ p += 16-state->memsize;
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+ state->memsize = 0;
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+ }
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+
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+ if (p <= b_end - 16) {
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+ const uint8_t *const limit = b_end - 16;
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+ uint32_t v1 = state->v1;
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+ uint32_t v2 = state->v2;
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+ uint32_t v3 = state->v3;
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+ uint32_t v4 = state->v4;
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+
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+ do {
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+ v1 = xxh32_round(v1, get_unaligned_le32(p));
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+ p += 4;
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+ v2 = xxh32_round(v2, get_unaligned_le32(p));
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+ p += 4;
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+ v3 = xxh32_round(v3, get_unaligned_le32(p));
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+ p += 4;
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+ v4 = xxh32_round(v4, get_unaligned_le32(p));
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+ p += 4;
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+ } while (p <= limit);
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+
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+ state->v1 = v1;
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+ state->v2 = v2;
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+ state->v3 = v3;
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+ state->v4 = v4;
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+ }
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+
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+ if (p < b_end) {
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+ memcpy(state->mem32, p, (size_t)(b_end-p));
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+ state->memsize = (uint32_t)(b_end-p);
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+ }
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+
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+ return 0;
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+}
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+EXPORT_SYMBOL(xxh32_update);
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+
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+uint32_t xxh32_digest(const struct xxh32_state *state)
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+{
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+ const uint8_t *p = (const uint8_t *)state->mem32;
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+ const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
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+ state->memsize;
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+ uint32_t h32;
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+
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+ if (state->large_len) {
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+ h32 = xxh_rotl32(state->v1, 1) + xxh_rotl32(state->v2, 7) +
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+ xxh_rotl32(state->v3, 12) + xxh_rotl32(state->v4, 18);
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+ } else {
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+ h32 = state->v3 /* == seed */ + PRIME32_5;
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+ }
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+
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+ h32 += state->total_len_32;
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+
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+ while (p + 4 <= b_end) {
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+ h32 += get_unaligned_le32(p) * PRIME32_3;
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+ h32 = xxh_rotl32(h32, 17) * PRIME32_4;
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+ p += 4;
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+ }
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+
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+ while (p < b_end) {
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+ h32 += (*p) * PRIME32_5;
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+ h32 = xxh_rotl32(h32, 11) * PRIME32_1;
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+ p++;
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+ }
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+
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+ h32 ^= h32 >> 15;
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+ h32 *= PRIME32_2;
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+ h32 ^= h32 >> 13;
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+ h32 *= PRIME32_3;
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+ h32 ^= h32 >> 16;
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+
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+ return h32;
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+}
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+EXPORT_SYMBOL(xxh32_digest);
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+
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+int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
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+{
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+ const uint8_t *p = (const uint8_t *)input;
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+ const uint8_t *const b_end = p + len;
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+
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+ if (input == NULL)
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+ return -EINVAL;
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+
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+ state->total_len += len;
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+
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+ if (state->memsize + len < 32) { /* fill in tmp buffer */
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+ memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
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+ state->memsize += (uint32_t)len;
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+ return 0;
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+ }
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+
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+ if (state->memsize) { /* tmp buffer is full */
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+ uint64_t *p64 = state->mem64;
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+
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+ memcpy(((uint8_t *)p64) + state->memsize, input,
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+ 32 - state->memsize);
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+
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+ state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
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+ p64++;
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+ state->v2 = xxh64_round(state->v2, get_unaligned_le64(p64));
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+ p64++;
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+ state->v3 = xxh64_round(state->v3, get_unaligned_le64(p64));
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+ p64++;
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+ state->v4 = xxh64_round(state->v4, get_unaligned_le64(p64));
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+
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+ p += 32 - state->memsize;
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+ state->memsize = 0;
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+ }
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+
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+ if (p + 32 <= b_end) {
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+ 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);
|