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// SPDX-License-Identifier: LGPL-3.0-or-later
#include "impl.h"
#define rotl(v, x) (((v) << (x)) | ((v) >> (64 - (x))))
#define ROUND do { \
v0 += v1; \
v2 += v3; \
v1 = rotl(v1, 13); \
v3 = rotl(v3, 16); \
v1 ^= v0; \
v3 ^= v2; \
v0 = rotl(v0, 32); \
v2 += v1; \
v0 += v3; \
v1 = rotl(v1, 17); \
v3 = rotl(v3, 21); \
v1 ^= v2; \
v3 ^= v0; \
v2 = rotl(v2, 32); \
} while(0)
uint64_t hkvs_hash(const char *hk, const char *data, size_t data_size) {
uint64_t hk0 = hkvs_read_u64(hk + 0);
uint64_t hk1 = hkvs_read_u64(hk + 8);
uint64_t v0 = (uint64_t)0x736f6d6570736575 ^ hk0;
uint64_t v1 = (uint64_t)0x646f72616e646f6d ^ hk1;
uint64_t v2 = (uint64_t)0x6c7967656e657261 ^ hk0;
uint64_t v3 = (uint64_t)0x7465646279746573 ^ hk1;
uint64_t last = (uint64_t)data_size << 56;
while(data_size >= 8) {
uint64_t m = hkvs_read_u64(data);
v3 ^= m;
ROUND;
v0 ^= m;
data += 8;
data_size -= 8;
}
switch(data_size) {
case 7:
last |= (uint64_t)(uint8_t)data[6] << 48;
HKVS_FALLTHROUGH;
case 6:
last |= (uint64_t)(uint8_t)data[5] << 40;
HKVS_FALLTHROUGH;
case 5:
last |= (uint64_t)(uint8_t)data[4] << 32;
HKVS_FALLTHROUGH;
case 4:
last |= (uint64_t)(uint8_t)data[3] << 24;
HKVS_FALLTHROUGH;
case 3:
last |= (uint64_t)(uint8_t)data[2] << 16;
HKVS_FALLTHROUGH;
case 2:
last |= (uint64_t)(uint8_t)data[1] << 8;
HKVS_FALLTHROUGH;
case 1:
last |= (uint64_t)(uint8_t)data[0];
HKVS_FALLTHROUGH;
case 0:
break;
default:
__builtin_unreachable();
}
v3 ^= last;
ROUND;
v0 ^= last;
v2 ^= 0xff;
ROUND;
ROUND;
ROUND;
return v0 ^ v1 ^ v2 ^ v3;
}
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