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