/*----------------------------------------------------------------------------*/
/* 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. */

/*----------------------------------------------------------------------------*/
/* Platform-specific functions and macros */

#include <stdint.h>

#if defined(_MSC_VER)
#define FORCE_INLINE	__forceinline
#else
#if __GNUC__ && __GNUC_STDC_INLINE__
#define FORCE_INLINE inline __attribute__((always_inline))
#else
#define FORCE_INLINE __attribute__((always_inline))
#endif
#endif
/* KDDKDD
inline uint32_t rotl32 ( uint32_t x, int8_t r )
{
  return (x << r) | (x >> (32 - r));
}

inline uint64_t rotl64 ( uint64_t x, int8_t r )
{
  return (x << r) | (x >> (64 - r));
}
*/

#define ROTL32(x,r) (uint32_t) \
  (((uint32_t)(x) << (int8_t)(r)) | ((uint32_t)(x) >> (32 - (int8_t)(r))))
#define ROTL64(x,r) (uint64_t) \
  (((uint64_t)(x) << (int8_t)(r)) | ((uint64_t)(x) >> (64 - (int8_t)(r))))

#define BIG_CONSTANT(x) (x##LLU)

/*--------------------------------------------------------------------------- */
/* Block read - if your platform needs to do endian-swapping or can only */
/* handle aligned reads, do the conversion here */

#define getblock(p, i) (p[i])

/*--------------------------------------------------------------------------- */
/* Finalization mix - force all bits of a hash block to avalanche */


/* Disable warnings associated with FORCE_INLINE */
/* Copied from ml/src/Smoother/ml_smoother.c     */
#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
#define GCC_VERSION __GNUC__*100+__GNUC_MINOR__*10+__GNUC_PATCHLEVEL__
#endif
#if defined(GCC_VERSION) && GCC_VERSION >= 460
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wattributes"
#endif
static FORCE_INLINE uint32_t fmix32 ( uint32_t h )
{
  h ^= h >> 16;
  h *= 0x85ebca6b;
  h ^= h >> 13;
  h *= 0xc2b2ae35;
  h ^= h >> 16;

  return h;
}
#if defined(GCC_VERSION) && GCC_VERSION >= 460
#pragma GCC diagnostic pop
#endif

/*---------- */

#if 0
/* KDDKDD NOT USED BY ZOLTAN  */
static FORCE_INLINE uint64_t fmix64 ( uint64_t k )
{
  k ^= k >> 33;
  k *= BIG_CONSTANT(0xff51afd7ed558ccd);
  k ^= k >> 33;
  k *= BIG_CONSTANT(0xc4ceb9fe1a85ec53);
  k ^= k >> 33;

  return k;
}
#endif

/*--------------------------------------------------------------------------- */

static 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;
  int i;

  uint32_t h1 = seed;

  uint32_t c1 = 0xcc9e2d51;
  uint32_t c2 = 0x1b873593;

  /*---------- */
  /* body */

  const uint32_t * blocks = (const uint32_t *)(data + nblocks*4);

  for(i = -nblocks; i; i++)
  {
    uint32_t k1 = getblock(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;
}

/*--------------------------------------------------------------------------- */

#if 0
/* KDDKDD NOT USED BY ZOLTAN */
static 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;
  int i;

  uint32_t h1 = seed;
  uint32_t h2 = seed;
  uint32_t h3 = seed;
  uint32_t h4 = seed;

  uint32_t c1 = 0x239b961b;
  uint32_t c2 = 0xab0e9789;
  uint32_t c3 = 0x38b34ae5;
  uint32_t c4 = 0xa1e38b93;

  /*---------- */
  /* body */

  const uint32_t * blocks = (const uint32_t *)(data + nblocks*16);

  for(i = -nblocks; i; i++)
  {
    uint32_t k1 = getblock(blocks,i*4+0);
    uint32_t k2 = getblock(blocks,i*4+1);
    uint32_t k3 = getblock(blocks,i*4+2);
    uint32_t k4 = getblock(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 = fmix64(h1);
  h2 = fmix64(h2);
  h3 = fmix64(h3);
  h4 = fmix64(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;
}
#endif

/*--------------------------------------------------------------------------- */

#if 0
/* KDDKDD NOT USED BY ZOLTAN */
static void MurmurHash3_x64_128 ( const void * key, const int len,
                                  const uint32_t seed, void * out )
{
  const uint8_t * data = (const uint8_t*)key;
  const int nblocks = len / 16;
  int i;

  uint64_t h1 = seed;
  uint64_t h2 = seed;

  uint64_t c1 = BIG_CONSTANT(0x87c37b91114253d5);
  uint64_t c2 = BIG_CONSTANT(0x4cf5ad432745937f);

  /*---------- */
  /* body */

  const uint64_t * blocks = (const uint64_t *)(data);

  for(i = 0; i < nblocks; i++)
  {
    uint64_t k1 = getblock(blocks,i*2+0);
    uint64_t k2 = getblock(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;
}
#endif
