/***
* This file is under MIT <year> Hajime Senuma, just like other files.
* See LICENSE for details.
*
* It was originally written by Austin Appleby in C++ under the public domain,
* but ported to PEP 7 C for Python 3.6 and later by the mmh3 project.
*
* Any issues should be reported to https://github.com/hajimes/mmh3/issues.
*
* The following is the original public domain notice by Austin Appleby.
*/
//-----------------------------------------------------------------------------
// MurmurHash3 was written by Austin Appleby, and is placed in the public
// domain. The author hereby disclaims copyright to this source code.
// Note - The x86 and x64 versions do _not_ produce the same results, as the
// algorithms are optimized for their respective platforms. You can still
// compile and run any of them on any platform, but your performance with the
// non-native version will be less than optimal.
#include "murmurhash3.h"
//-----------------------------------------------------------------------------
void
murmurhash3_x86_32(const void *key, Py_ssize_t len, uint32_t seed, void *out)
{
const uint8_t *data = (const uint8_t *)key;
const Py_ssize_t nblocks = len / 4;
uint32_t h1 = seed;
const uint32_t c1 = 0xcc9e2d51;
const uint32_t c2 = 0x1b873593;
//----------
// body
const uint32_t *blocks = (const uint32_t *)(data + nblocks * 4);
for (Py_ssize_t i = -nblocks; i; i++) {
uint32_t k1 = getblock32(blocks, i);
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(h1, 13);
h1 = h1 * 5 + 0xe6546b64;
}
//----------
// tail
const uint8_t *tail = (const uint8_t *)(data + nblocks * 4);
uint32_t k1 = 0;
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;
h1 = fmix32(h1);
*(uint32_t *)out = h1;
}
//-----------------------------------------------------------------------------
void
murmurhash3_x86_128(const void *key, const Py_ssize_t len, uint32_t seed,
void *out)
{
const uint8_t *data = (const uint8_t *)key;
const Py_ssize_t nblocks = len / 16;
uint32_t h1 = seed;
uint32_t h2 = seed;
uint32_t h3 = seed;
uint32_t h4 = seed;
const uint32_t c1 = 0x239b961b;
const uint32_t c2 = 0xab0e9789;
const uint32_t c3 = 0x38b34ae5;
const uint32_t c4 = 0xa1e38b93;
//----------
// body
const uint32_t *blocks = (const uint32_t *)(data + nblocks * 16);
for (Py_ssize_t i = -nblocks; i; i++) {
uint32_t k1 = getblock32(blocks, i * 4 + 0);
uint32_t k2 = getblock32(blocks, i * 4 + 1);
uint32_t k3 = getblock32(blocks, i * 4 + 2);
uint32_t k4 = getblock32(blocks, i * 4 + 3);
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
h1 = ROTL32(h1, 19);
h1 += h2;
h1 = h1 * 5 + 0x561ccd1b;
k2 *= c2;
k2 = ROTL32(k2, 16);
k2 *= c3;
h2 ^= k2;
h2 = ROTL32(h2, 17);
h2 += h3;
h2 = h2 * 5 + 0x0bcaa747;
k3 *= c3;
k3 = ROTL32(k3, 17);
k3 *= c4;
h3 ^= k3;
h3 = ROTL32(h3, 15);
h3 += h4;
h3 = h3 * 5 + 0x96cd1c35;
k4 *= c4;
k4 = ROTL32(k4, 18);
k4 *= c1;
h4 ^= k4;
h4 = ROTL32(h4, 13);
h4 += h1;
h4 = h4 * 5 + 0x32ac3b17;
}
//----------
// tail
const uint8_t *tail = (const uint8_t *)(data + nblocks * 16);
uint32_t k1 = 0;
uint32_t k2 = 0;
uint32_t k3 = 0;
uint32_t k4 = 0;
switch (len & 15) {
case 15:
k4 ^= tail[14] << 16;
case 14:
k4 ^= tail[13] << 8;
case 13:
k4 ^= tail[12] << 0;
k4 *= c4;
k4 = ROTL32(k4, 18);
k4 *= c1;
h4 ^= k4;
case 12:
k3 ^= tail[11] << 24;
case 11:
k3 ^= tail[10] << 16;
case 10:
k3 ^= tail[9] << 8;
case 9:
k3 ^= tail[8] << 0;
k3 *= c3;
k3 = ROTL32(k3, 17);
k3 *= c4;
h3 ^= k3;
case 8:
k2 ^= tail[7] << 24;
case 7:
k2 ^= tail[6] << 16;
case 6:
k2 ^= tail[5] << 8;
case 5:
k2 ^= tail[4] << 0;
k2 *= c2;
k2 = ROTL32(k2, 16);
k2 *= c3;
h2 ^= k2;
case 4:
k1 ^= tail[3] << 24;
case 3:
k1 ^= tail[2] << 16;
case 2:
k1 ^= tail[1] << 8;
case 1:
k1 ^= tail[0] << 0;
k1 *= c1;
k1 = ROTL32(k1, 15);
k1 *= c2;
h1 ^= k1;
};
//----------
// finalization
h1 ^= len;
h2 ^= len;
h3 ^= len;
h4 ^= len;
h1 += h2;
h1 += h3;
h1 += h4;
h2 += h1;
h3 += h1;
h4 += h1;
h1 = fmix32(h1);
h2 = fmix32(h2);
h3 = fmix32(h3);
h4 = fmix32(h4);
h1 += h2;
h1 += h3;
h1 += h4;
h2 += h1;
h3 += h1;
h4 += h1;
#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
((uint32_t *)out)[0] = h2;
((uint32_t *)out)[1] = h1;
((uint32_t *)out)[2] = h4;
((uint32_t *)out)[3] = h3;
#else
((uint32_t *)out)[0] = h1;
((uint32_t *)out)[1] = h2;
((uint32_t *)out)[2] = h3;
((uint32_t *)out)[3] = h4;
#endif
}
//-----------------------------------------------------------------------------
void
murmurhash3_x64_128(const void *key, const Py_ssize_t len, const uint32_t seed,
void *out)
{
const uint8_t *data = (const uint8_t *)key;
const Py_ssize_t nblocks = len / 16;
uint64_t h1 = seed;
uint64_t h2 = seed;
const uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);
const uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);
//----------
// body
const uint64_t *blocks = (const uint64_t *)(data);
for (Py_ssize_t i = 0; i < nblocks; i++) {
uint64_t k1 = getblock64(blocks, i * 2 + 0);
uint64_t k2 = getblock64(blocks, i * 2 + 1);
k1 *= c1;
k1 = ROTL64(k1, 31);
k1 *= c2;
h1 ^= k1;
h1 = ROTL64(h1, 27);
h1 += h2;
h1 = h1 * 5 + 0x52dce729;
k2 *= c2;
k2 = ROTL64(k2, 33);
k2 *= c1;
h2 ^= k2;
h2 = ROTL64(h2, 31);
h2 += h1;
h2 = h2 * 5 + 0x38495ab5;
}
//----------
// tail
const uint8_t *tail = (const uint8_t *)(data + nblocks * 16);
uint64_t k1 = 0;
uint64_t k2 = 0;
switch (len & 15) {
case 15:
k2 ^= ((uint64_t)tail[14]) << 48;
case 14:
k2 ^= ((uint64_t)tail[13]) << 40;
case 13:
k2 ^= ((uint64_t)tail[12]) << 32;
case 12:
k2 ^= ((uint64_t)tail[11]) << 24;
case 11:
k2 ^= ((uint64_t)tail[10]) << 16;
case 10:
k2 ^= ((uint64_t)tail[9]) << 8;
case 9:
k2 ^= ((uint64_t)tail[8]) << 0;
k2 *= c2;
k2 = ROTL64(k2, 33);
k2 *= c1;
h2 ^= k2;
case 8:
k1 ^= ((uint64_t)tail[7]) << 56;
case 7:
k1 ^= ((uint64_t)tail[6]) << 48;
case 6:
k1 ^= ((uint64_t)tail[5]) << 40;
case 5:
k1 ^= ((uint64_t)tail[4]) << 32;
case 4:
k1 ^= ((uint64_t)tail[3]) << 24;
case 3:
k1 ^= ((uint64_t)tail[2]) << 16;
case 2:
k1 ^= ((uint64_t)tail[1]) << 8;
case 1:
k1 ^= ((uint64_t)tail[0]) << 0;
k1 *= c1;
k1 = ROTL64(k1, 31);
k1 *= c2;
h1 ^= k1;
};
//----------
// finalization
h1 ^= len;
h2 ^= len;
h1 += h2;
h2 += h1;
h1 = fmix64(h1);
h2 = fmix64(h2);
h1 += h2;
h2 += h1;
((uint64_t *)out)[0] = h1;
((uint64_t *)out)[1] = h2;
}
//-----------------------------------------------------------------------------