// murmurHash3 (x86_32): https://code.google.com/p/smhasher/ - for non-cryptographic use only uint32_t BRMurmur3_32(const void *data, size_t len, uint32_t seed) { uint32_t h = seed, k = 0; size_t i, count = len/4; assert(data != NULL || len == 0); for (i = 0; i < count; i++) { k = le32(((const uint32_t *)data)[i])*C1; k = rol32(k, 15)*C2; h ^= k; h = rol32(h, 13)*5 + 0xe6546b64; } k = 0; switch (len & 3) { case 3: k ^= ((const uint8_t *)data)[i*4 + 2] << 16; // fall through case 2: k ^= ((const uint8_t *)data)[i*4 + 1] << 8; // fall through case 1: k ^= ((const uint8_t *)data)[i*4], k *= C1, h ^= rol32(k, 15)*C2; } h ^= len; fmix32(h); return h; }
void MurmurHash3_x86_32 ( const void * key, int len, uint32_t seed, void * out ) { const uint8_t * data = (const uint8_t*)key; const int 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(int 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 int len, uint32_t seed, void * out ) { const uint8_t * data = (const uint8_t*)key; const int 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(int 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; ((uint32_t*)out)[0] = h1; ((uint32_t*)out)[1] = h2; ((uint32_t*)out)[2] = h3; ((uint32_t*)out)[3] = h4; }