uint32_t gpr_murmur_hash3(const void *key, size_t len, uint32_t seed) {
const uint8_t *data = (const uint8_t *)key;
const size_t nblocks = len / 4;
int i;
uint32_t h1 = seed;
uint32_t k1;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
const uint32_t *blocks = ((const uint32_t *)key) + nblocks;
const uint8_t *tail = (const uint8_t *)(data + nblocks * 4);
/* body */
for (i = -(int)nblocks; i; i++) {
memcpy(&k1, blocks + i, sizeof(uint32_t));
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
k1 = 0;
/* tail */
switch (len & 3) {
case 3:
k1 ^= ((uint32_t)tail[2]) << 16;
/* fallthrough */
case 2:
k1 ^= ((uint32_t)tail[1]) << 8;
/* fallthrough */
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
/* finalization */
h1 ^= (uint32_t)len;
FMIX32(h1);
return h1;
}
gpr_uint32 gpr_murmur_hash3(const void *key, size_t len, gpr_uint32 seed) {
const gpr_uint8 *data = (const gpr_uint8 *)key;
const int nblocks = len / 4;
int i;
gpr_uint32 h1 = seed;
gpr_uint32 k1;
const gpr_uint32 c1 = 0xcc9e2d51;
const gpr_uint32 c2 = 0x1b873593;
const gpr_uint32 *blocks = (const uint32_t *)(data + nblocks * 4);
const uint8_t *tail = (const uint8_t *)(data + nblocks * 4);
/* body */
for (i = -nblocks; i; i++) {
k1 = GETBLOCK32(blocks, i);
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
k1 = 0;
/* tail */
switch (len & 3) {
case 3:
k1 ^= tail[2] << 16;
case 2:
k1 ^= tail[1] << 8;
case 1:
k1 ^= tail[0];
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
/* finalization */
h1 ^= len;
FMIX32(h1);
return h1;
}
