/*

*  xxHash - Fast Hash algorithm

*  Copyright (C) 2012-2016, Yann Collet

*

*  BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)

*

*  Redistribution and use in source and binary forms, with or without

*  modification, are permitted provided that the following conditions are

*  met:

*

*  * Redistributions of source code must retain the above copyright

*  notice, this list of conditions and the following disclaimer.

*  * Redistributions in binary form must reproduce the above

*  copyright notice, this list of conditions and the following disclaimer

*  in the documentation and/or other materials provided with the

*  distribution.

*

*  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

*  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

*  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

*  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

*  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

*  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

*  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

*  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

*  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*

*  You can contact the author at :

*  - xxHash homepage: http://www.xxhash.com

*  - xxHash source repository : https://github.com/Cyan4973/xxHash

*/

/* *************************************

*  Tuning parameters

***************************************/

/*!XXH_FORCE_MEMORY_ACCESS :

 * By default, access to unaligned memory is controlled by `memcpy()`, which is safe and portable.

 * Unfortunately, on some target/compiler combinations, the generated assembly is sub-optimal.

 * The below switch allow to select different access method for improved performance.

 * Method 0 (default) : use `memcpy()`. Safe and portable.

 * Method 1 : `__packed` statement. It depends on compiler extension (ie, not portable).

 *            This method is safe if your compiler supports it, and *generally* as fast or faster than `memcpy`.

 * Method 2 : direct access. This method doesn't depend on compiler but violate C standard.

 *            It can generate buggy code on targets which do not support unaligned memory accesses.

 *            But in some circumstances, it's the only known way to get the most performance (ie GCC + ARMv6)

 * See http://stackoverflow.com/a/32095106/646947 for details.

 * Prefer these methods in priority order (0 > 1 > 2)

 */

#ifndef XXH_FORCE_MEMORY_ACCESS   /* can be defined externally, on command line for example */

#  if defined(__GNUC__) && ( defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \

                        || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \

                        || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) )

#    define XXH_FORCE_MEMORY_ACCESS 2

#  elif (defined(__INTEL_COMPILER) && !defined(_WIN32)) || \

  (defined(__GNUC__) && ( defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \

                    || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \

                    || defined(__ARM_ARCH_7S__) ))

#    define XXH_FORCE_MEMORY_ACCESS 1

#  endif

#endif

/*!XXH_ACCEPT_NULL_INPUT_POINTER :

 * If input pointer is NULL, xxHash default behavior is to dereference it, triggering a segfault.

 * When this macro is enabled, xxHash actively checks input for null pointer.

 * It it is, result for null input pointers is the same as a null-length input.

 */

#ifndef XXH_ACCEPT_NULL_INPUT_POINTER   /* can be defined externally */

#  define XXH_ACCEPT_NULL_INPUT_POINTER 0

#endif

/*!XXH_FORCE_NATIVE_FORMAT :

 * By default, xxHash library provides endian-independent Hash values, based on little-endian convention.

 * Results are therefore identical for little-endian and big-endian CPU.

 * This comes at a performance cost for big-endian CPU, since some swapping is required to emulate little-endian format.

 * Should endian-independence be of no importance for your application, you may set the #define below to 1,

 * to improve speed for Big-endian CPU.

 * This option has no impact on Little_Endian CPU.

 */

#ifndef XXH_FORCE_NATIVE_FORMAT   /* can be defined externally */

#  define XXH_FORCE_NATIVE_FORMAT 0

#endif

/*!XXH_FORCE_ALIGN_CHECK :

 * This is a minor performance trick, only useful with lots of very small keys.

 * It means : check for aligned/unaligned input.

 * The check costs one initial branch per hash;

 * set it to 0 when the input is guaranteed to be aligned,

 * or when alignment doesn't matter for performance.

 */

#ifndef XXH_FORCE_ALIGN_CHECK /* can be defined externally */

#  if defined(__i386) || defined(_M_IX86) || defined(__x86_64__) || defined(_M_X64)

#    define XXH_FORCE_ALIGN_CHECK 0

#  else

#    define XXH_FORCE_ALIGN_CHECK 1

#  endif

#endif

/* *************************************

*  Includes & Memory related functions

***************************************/

/*! Modify the local functions below should you wish to use some other memory routines

*   for malloc(), free() */

#include <stdlib.h>

static void* XXH_malloc(size_t s) { return malloc(s); }

static void  XXH_free  (void* p)  { free(p); }

/*! and for memcpy() */

#include <string.h>

static void* XXH_memcpy(void* dest, const void* src, size_t size) { return memcpy(dest,src,size); }

#include <assert.h>   /* assert */

#define XXH_STATIC_LINKING_ONLY

#include "xxhash.h"

/* *************************************

*  Compiler Specific Options

***************************************/

#if defined (_MSC_VER) && !defined (__clang__)    /* MSVC */

#  pragma warning(disable : 4127)      /* disable: C4127: conditional expression is constant */

#  define FORCE_INLINE static __forceinline

#else

#  if defined (__cplusplus) || defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L   /* C99 */

#    if defined (__GNUC__) || defined (__clang__)

#      define FORCE_INLINE static inline __attribute__((always_inline))

#    else

#      define FORCE_INLINE static inline

#    endif

#  else

#    define FORCE_INLINE static

#  endif /* __STDC_VERSION__ */

#endif

/* *************************************

*  Basic Types

***************************************/

#ifndef MEM_MODULE

# if !defined (__VMS) \

  && (defined (__cplusplus) \

  || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )

#   include <stdint.h>

    typedef uint8_t  BYTE;

    typedef uint16_t U16;

    typedef uint32_t U32;

# else

    typedef unsigned char      BYTE;

    typedef unsigned short     U16;

    typedef unsigned int       U32;

# endif

#endif

#if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2))

/* Force direct memory access. Only works on CPU which support unaligned memory access in hardware */

static U32 XXH_read32(const void* memPtr) { return *(const U32*) memPtr; }

#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1))

/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */

/* currently only defined for gcc and icc */

typedef union { U32 u32; } __attribute__((packed)) unalign;

static U32 XXH_read32(const void* ptr) { return ((const unalign*)ptr)->u32; }

#else

/* portable and safe solution. Generally efficient.

 * see : http://stackoverflow.com/a/32095106/646947

 */

static U32 XXH_read32(const void* memPtr)

{

    U32 val;

    memcpy(&val, memPtr, sizeof(val));

    return val;

}

#endif   /* XXH_FORCE_DIRECT_MEMORY_ACCESS */

/* ****************************************

*  Compiler-specific Functions and Macros

******************************************/

#define XXH_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)

/* Note : although _rotl exists for minGW (GCC under windows), performance seems poor */

#if defined(_MSC_VER)

#  define XXH_rotl32(x,r) _rotl(x,r)

#  define XXH_rotl64(x,r) _rotl64(x,r)

#else

#  define XXH_rotl32(x,r) ((x << r) | (x >> (32 - r)))

#  define XXH_rotl64(x,r) ((x << r) | (x >> (64 - r)))

#endif

#if defined(_MSC_VER)     /* Visual Studio */

#  define XXH_swap32 _byteswap_ulong

#elif XXH_GCC_VERSION >= 403

#  define XXH_swap32 __builtin_bswap32

#else

static U32 XXH_swap32 (U32 x)

{

    return  ((x << 24) & 0xff000000 ) |

            ((x <<  8) & 0x00ff0000 ) |

            ((x >>  8) & 0x0000ff00 ) |

            ((x >> 24) & 0x000000ff );

}

#endif

/* *************************************

*  Architecture Macros

***************************************/

typedef enum { XXH_bigEndian=0, XXH_littleEndian=1 } XXH_endianness;

/* XXH_CPU_LITTLE_ENDIAN can be defined externally, for example on the compiler command line */

#ifndef XXH_CPU_LITTLE_ENDIAN

static int XXH_isLittleEndian(void)

{

    const union { U32 u; BYTE c[4]; } one = { 1 };   /* don't use static : performance detrimental  */

    return one.c[0];

}

#   define XXH_CPU_LITTLE_ENDIAN   XXH_isLittleEndian()

#endif

/* ***************************

*  Memory reads

*****************************/

typedef enum { XXH_aligned, XXH_unaligned } XXH_alignment;

FORCE_INLINE U32 XXH_readLE32_align(const void* ptr, XXH_endianness endian, XXH_alignment align)

{

    if (align==XXH_unaligned)

        return endian==XXH_littleEndian ? XXH_read32(ptr) : XXH_swap32(XXH_read32(ptr));

    else

        return endian==XXH_littleEndian ? *(const U32*)ptr : XXH_swap32(*(const U32*)ptr);

}

FORCE_INLINE U32 XXH_readLE32(const void* ptr, XXH_endianness endian)

{

    return XXH_readLE32_align(ptr, endian, XXH_unaligned);

}

static U32 XXH_readBE32(const void* ptr)

{

    return XXH_CPU_LITTLE_ENDIAN ? XXH_swap32(XXH_read32(ptr)) : XXH_read32(ptr);

}

/* *************************************

*  Macros

***************************************/

#define XXH_STATIC_ASSERT(c)  { enum { XXH_sa = 1/(int)(!!(c)) }; }  /* use after variable declarations */

XXH_PUBLIC_API unsigned XXH_versionNumber (void) { return XXH_VERSION_NUMBER; }

/* *******************************************************************

*  32-bit hash functions

*********************************************************************/

static const U32 PRIME32_1 = 2654435761U;

static const U32 PRIME32_2 = 2246822519U;

static const U32 PRIME32_3 = 3266489917U;

static const U32 PRIME32_4 =  668265263U;

static const U32 PRIME32_5 =  374761393U;

static U32 XXH32_round(U32 seed, U32 input)

{

    seed += input * PRIME32_2;

    seed  = XXH_rotl32(seed, 13);

    seed *= PRIME32_1;

    return seed;

}

/* mix all bits */

static U32 XXH32_avalanche(U32 h32)

{

    h32 ^= h32 >> 15;

    h32 *= PRIME32_2;

    h32 ^= h32 >> 13;

    h32 *= PRIME32_3;

    h32 ^= h32 >> 16;

    return(h32);

}

#define XXH_get32bits(p) XXH_readLE32_align(p, endian, align)

static U32

XXH32_finalize(U32 h32, const void* ptr, size_t len,

                XXH_endianness endian, XXH_alignment align)

{

    const BYTE* p = (const BYTE*)ptr;

#define PROCESS1               \

    h32 += (*p++) * PRIME32_5; \

    h32 = XXH_rotl32(h32, 11) * PRIME32_1 ;

#define PROCESS4                         \

    h32 += XXH_get32bits(p) * PRIME32_3; \

    p+=4;                                \

    h32  = XXH_rotl32(h32, 17) * PRIME32_4 ;

    switch(len&15)  /* or switch(bEnd - p) */

    {

      case 12:      PROCESS4;

                    /* fallthrough */

      case 8:       PROCESS4;

                    /* fallthrough */

      case 4:       PROCESS4;

                    return XXH32_avalanche(h32);

      case 13:      PROCESS4;

                    /* fallthrough */

      case 9:       PROCESS4;

                    /* fallthrough */

      case 5:       PROCESS4;

                    PROCESS1;

                    return XXH32_avalanche(h32);

      case 14:      PROCESS4;

                    /* fallthrough */

      case 10:      PROCESS4;

                    /* fallthrough */

      case 6:       PROCESS4;

                    PROCESS1;

                    PROCESS1;

                    return XXH32_avalanche(h32);

      case 15:      PROCESS4;

                    /* fallthrough */

      case 11:      PROCESS4;

                    /* fallthrough */

      case 7:       PROCESS4;

                    /* fallthrough */

      case 3:       PROCESS1;

                    /* fallthrough */

      case 2:       PROCESS1;

                    /* fallthrough */

      case 1:       PROCESS1;

                    /* fallthrough */

      case 0:       return XXH32_avalanche(h32);

    }

    assert(0);

    return h32;   /* reaching this point is deemed impossible */

}

FORCE_INLINE U32

XXH32_endian_align(const void* input, size_t len, U32 seed,

                    XXH_endianness endian, XXH_alignment align)

{

    const BYTE* p = (const BYTE*)input;

    const BYTE* bEnd = p + len;

    U32 h32;

#if defined(XXH_ACCEPT_NULL_INPUT_POINTER) && (XXH_ACCEPT_NULL_INPUT_POINTER>=1)

    if (p==NULL) {

        len=0;

        bEnd=p=(const BYTE*)(size_t)16;

    }

#endif

    if (len>=16) {

        const BYTE* const limit = bEnd - 15;

        U32 v1 = seed + PRIME32_1 + PRIME32_2;

        U32 v2 = seed + PRIME32_2;

        U32 v3 = seed + 0;

        U32 v4 = seed - PRIME32_1;

        do {

            v1 = XXH32_round(v1, XXH_get32bits(p)); p+=4;

            v2 = XXH32_round(v2, XXH_get32bits(p)); p+=4;

            v3 = XXH32_round(v3, XXH_get32bits(p)); p+=4;

            v4 = XXH32_round(v4, XXH_get32bits(p)); p+=4;

        } while (p < limit);

        h32 = XXH_rotl32(v1, 1)  + XXH_rotl32(v2, 7)

            + XXH_rotl32(v3, 12) + XXH_rotl32(v4, 18);

    } else {

        h32  = seed + PRIME32_5;

    }

    h32 += (U32)len;

    return XXH32_finalize(h32, p, len&15, endian, align);

}

XXH_PUBLIC_API unsigned int XXH32 (const void* input, size_t len, unsigned int seed)

{

#if 0

    /* Simple version, good for code maintenance, but unfortunately slow for small inputs */

    XXH32_state_t state;

    XXH32_reset(&state, seed);

    XXH32_update(&state, input, len);

    return XXH32_digest(&state);

#else

    XXH_endianness endian_detected = (XXH_endianness)XXH_CPU_LITTLE_ENDIAN;

    if (XXH_FORCE_ALIGN_CHECK) {

        if ((((size_t)input) & 3) == 0) {   /* Input is 4-bytes aligned, leverage the speed benefit */

            if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

                return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned);

            else

                return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned);

    }   }

    if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

        return XXH32_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned);

    else

        return XXH32_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned);

#endif

}

/*======   Hash streaming   ======*/

XXH_PUBLIC_API XXH32_state_t* XXH32_createState(void)

{

    return (XXH32_state_t*)XXH_malloc(sizeof(XXH32_state_t));

}

XXH_PUBLIC_API XXH_errorcode XXH32_freeState(XXH32_state_t* statePtr)

{

    XXH_free(statePtr);

    return XXH_OK;

}

XXH_PUBLIC_API void XXH32_copyState(XXH32_state_t* dstState, const XXH32_state_t* srcState)

{

    memcpy(dstState, srcState, sizeof(*dstState));

}

XXH_PUBLIC_API XXH_errorcode XXH32_reset(XXH32_state_t* statePtr, unsigned int seed)

{

    XXH32_state_t state;   /* using a local state to memcpy() in order to avoid strict-aliasing warnings */

    memset(&state, 0, sizeof(state));

    state.v1 = seed + PRIME32_1 + PRIME32_2;

    state.v2 = seed + PRIME32_2;

    state.v3 = seed + 0;

    state.v4 = seed - PRIME32_1;

    /* do not write into reserved, planned to be removed in a future version */

    memcpy(statePtr, &state, sizeof(state) - sizeof(state.reserved));

    return XXH_OK;

}

FORCE_INLINE XXH_errorcode

XXH32_update_endian(XXH32_state_t* state, const void* input, size_t len, XXH_endianness endian)

{

    if (input==NULL)

#if defined(XXH_ACCEPT_NULL_INPUT_POINTER) && (XXH_ACCEPT_NULL_INPUT_POINTER>=1)

        return XXH_OK;

#else

        return XXH_ERROR;

#endif

    {   const BYTE* p = (const BYTE*)input;

        const BYTE* const bEnd = p + len;

        state->total_len_32 += (unsigned)len;

        state->large_len |= (len>=16) | (state->total_len_32>=16);

        if (state->memsize + len < 16)  {   /* fill in tmp buffer */

            XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, len);

            state->memsize += (unsigned)len;

            return XXH_OK;

        }

        if (state->memsize) {   /* some data left from previous update */

            XXH_memcpy((BYTE*)(state->mem32) + state->memsize, input, 16-state->memsize);

            {   const U32* p32 = state->mem32;

                state->v1 = XXH32_round(state->v1, XXH_readLE32(p32, endian)); p32++;

                state->v2 = XXH32_round(state->v2, XXH_readLE32(p32, endian)); p32++;

                state->v3 = XXH32_round(state->v3, XXH_readLE32(p32, endian)); p32++;

                state->v4 = XXH32_round(state->v4, XXH_readLE32(p32, endian));

            }

            p += 16-state->memsize;

            state->memsize = 0;

        }

        if (p <= bEnd-16) {

            const BYTE* const limit = bEnd - 16;

            U32 v1 = state->v1;

            U32 v2 = state->v2;

            U32 v3 = state->v3;

            U32 v4 = state->v4;

            do {

                v1 = XXH32_round(v1, XXH_readLE32(p, endian)); p+=4;

                v2 = XXH32_round(v2, XXH_readLE32(p, endian)); p+=4;

                v3 = XXH32_round(v3, XXH_readLE32(p, endian)); p+=4;

                v4 = XXH32_round(v4, XXH_readLE32(p, endian)); p+=4;

            } while (p<=limit);

            state->v1 = v1;

            state->v2 = v2;

            state->v3 = v3;

            state->v4 = v4;

        }

        if (p < bEnd) {

            XXH_memcpy(state->mem32, p, (size_t)(bEnd-p));

            state->memsize = (unsigned)(bEnd-p);

        }

    }

    return XXH_OK;

}

XXH_PUBLIC_API XXH_errorcode XXH32_update (XXH32_state_t* state_in, const void* input, size_t len)

{

    XXH_endianness endian_detected = (XXH_endianness)XXH_CPU_LITTLE_ENDIAN;

    if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

        return XXH32_update_endian(state_in, input, len, XXH_littleEndian);

    else

        return XXH32_update_endian(state_in, input, len, XXH_bigEndian);

}

FORCE_INLINE U32

XXH32_digest_endian (const XXH32_state_t* state, XXH_endianness endian)

{

    U32 h32;

    if (state->large_len) {

        h32 = XXH_rotl32(state->v1, 1)

            + XXH_rotl32(state->v2, 7)

            + XXH_rotl32(state->v3, 12)

            + XXH_rotl32(state->v4, 18);

    } else {

        h32 = state->v3 /* == seed */ + PRIME32_5;

    }

    h32 += state->total_len_32;

    return XXH32_finalize(h32, state->mem32, state->memsize, endian, XXH_aligned);

}

XXH_PUBLIC_API unsigned int XXH32_digest (const XXH32_state_t* state_in)

{

    XXH_endianness endian_detected = (XXH_endianness)XXH_CPU_LITTLE_ENDIAN;

    if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

        return XXH32_digest_endian(state_in, XXH_littleEndian);

    else

        return XXH32_digest_endian(state_in, XXH_bigEndian);

}

/*======   Canonical representation   ======*/

/*! Default XXH result types are basic unsigned 32 and 64 bits.

*   The canonical representation follows human-readable write convention, aka big-endian (large digits first).

*   These functions allow transformation of hash result into and from its canonical format.

*   This way, hash values can be written into a file or buffer, remaining comparable across different systems.

*/

XXH_PUBLIC_API void XXH32_canonicalFromHash(XXH32_canonical_t* dst, XXH32_hash_t hash)

{

    XXH_STATIC_ASSERT(sizeof(XXH32_canonical_t) == sizeof(XXH32_hash_t));

    if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap32(hash);

    memcpy(dst, &hash, sizeof(*dst));

}

XXH_PUBLIC_API XXH32_hash_t XXH32_hashFromCanonical(const XXH32_canonical_t* src)

{

    return XXH_readBE32(src);

}

#ifndef XXH_NO_LONG_LONG

/* *******************************************************************

*  64-bit hash functions

*********************************************************************/

/*======   Memory access   ======*/

#ifndef MEM_MODULE

# define MEM_MODULE

# if !defined (__VMS) \

  && (defined (__cplusplus) \

  || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )

#   include <stdint.h>

    typedef uint64_t U64;

# else

    /* if compiler doesn't support unsigned long long, replace by another 64-bit type */

    typedef unsigned long long U64;

# endif

#endif

#if (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==2))

/* Force direct memory access. Only works on CPU which support unaligned memory access in hardware */

static U64 XXH_read64(const void* memPtr) { return *(const U64*) memPtr; }

#elif (defined(XXH_FORCE_MEMORY_ACCESS) && (XXH_FORCE_MEMORY_ACCESS==1))

/* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */

/* currently only defined for gcc and icc */

typedef union { U32 u32; U64 u64; } __attribute__((packed)) unalign64;

static U64 XXH_read64(const void* ptr) { return ((const unalign64*)ptr)->u64; }

#else

/* portable and safe solution. Generally efficient.

 * see : http://stackoverflow.com/a/32095106/646947

 */

static U64 XXH_read64(const void* memPtr)

{

    U64 val;

    memcpy(&val, memPtr, sizeof(val));

    return val;

}

#endif   /* XXH_FORCE_DIRECT_MEMORY_ACCESS */

#if defined(_MSC_VER)     /* Visual Studio */

#  define XXH_swap64 _byteswap_uint64

#elif XXH_GCC_VERSION >= 403

#  define XXH_swap64 __builtin_bswap64

#else

static U64 XXH_swap64 (U64 x)

{

    return  ((x << 56) & 0xff00000000000000ULL) |

            ((x << 40) & 0x00ff000000000000ULL) |

            ((x << 24) & 0x0000ff0000000000ULL) |

            ((x << 8)  & 0x000000ff00000000ULL) |

            ((x >> 8)  & 0x00000000ff000000ULL) |

            ((x >> 24) & 0x0000000000ff0000ULL) |

            ((x >> 40) & 0x000000000000ff00ULL) |

            ((x >> 56) & 0x00000000000000ffULL);

}

#endif

FORCE_INLINE U64 XXH_readLE64_align(const void* ptr, XXH_endianness endian, XXH_alignment align)

{

    if (align==XXH_unaligned)

        return endian==XXH_littleEndian ? XXH_read64(ptr) : XXH_swap64(XXH_read64(ptr));

    else

        return endian==XXH_littleEndian ? *(const U64*)ptr : XXH_swap64(*(const U64*)ptr);

}

FORCE_INLINE U64 XXH_readLE64(const void* ptr, XXH_endianness endian)

{

    return XXH_readLE64_align(ptr, endian, XXH_unaligned);

}

static U64 XXH_readBE64(const void* ptr)

{

    return XXH_CPU_LITTLE_ENDIAN ? XXH_swap64(XXH_read64(ptr)) : XXH_read64(ptr);

}

/*======   xxh64   ======*/

static const U64 PRIME64_1 = 11400714785074694791ULL;

static const U64 PRIME64_2 = 14029467366897019727ULL;

static const U64 PRIME64_3 =  1609587929392839161ULL;

static const U64 PRIME64_4 =  9650029242287828579ULL;

static const U64 PRIME64_5 =  2870177450012600261ULL;

static U64 XXH64_round(U64 acc, U64 input)

{

    acc += input * PRIME64_2;

    acc  = XXH_rotl64(acc, 31);

    acc *= PRIME64_1;

    return acc;

}

static U64 XXH64_mergeRound(U64 acc, U64 val)

{

    val  = XXH64_round(0, val);

    acc ^= val;

    acc  = acc * PRIME64_1 + PRIME64_4;

    return acc;

}

static U64 XXH64_avalanche(U64 h64)

{

    h64 ^= h64 >> 33;

    h64 *= PRIME64_2;

    h64 ^= h64 >> 29;

    h64 *= PRIME64_3;

    h64 ^= h64 >> 32;

    return h64;

}

#define XXH_get64bits(p) XXH_readLE64_align(p, endian, align)

static U64

XXH64_finalize(U64 h64, const void* ptr, size_t len,

               XXH_endianness endian, XXH_alignment align)

{

    const BYTE* p = (const BYTE*)ptr;

#define PROCESS1_64            \

    h64 ^= (*p++) * PRIME64_5; \

    h64 = XXH_rotl64(h64, 11) * PRIME64_1;

#define PROCESS4_64          \

    h64 ^= (U64)(XXH_get32bits(p)) * PRIME64_1; \

    p+=4;                    \

    h64 = XXH_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;

#define PROCESS8_64 {        \

    U64 const k1 = XXH64_round(0, XXH_get64bits(p)); \

    p+=8;                    \

    h64 ^= k1;               \

    h64  = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; \

}

    switch(len&31) {

      case 24: PROCESS8_64;

                    /* fallthrough */

      case 16: PROCESS8_64;

                    /* fallthrough */

      case  8: PROCESS8_64;

               return XXH64_avalanche(h64);

      case 28: PROCESS8_64;

                    /* fallthrough */

      case 20: PROCESS8_64;

                    /* fallthrough */

      case 12: PROCESS8_64;

                    /* fallthrough */

      case  4: PROCESS4_64;

               return XXH64_avalanche(h64);

      case 25: PROCESS8_64;

                    /* fallthrough */

      case 17: PROCESS8_64;

                    /* fallthrough */

      case  9: PROCESS8_64;

               PROCESS1_64;

               return XXH64_avalanche(h64);

      case 29: PROCESS8_64;

                    /* fallthrough */

      case 21: PROCESS8_64;

                    /* fallthrough */

      case 13: PROCESS8_64;

                    /* fallthrough */

      case  5: PROCESS4_64;

               PROCESS1_64;

               return XXH64_avalanche(h64);

      case 26: PROCESS8_64;

                    /* fallthrough */

      case 18: PROCESS8_64;

                    /* fallthrough */

      case 10: PROCESS8_64;

               PROCESS1_64;

               PROCESS1_64;

               return XXH64_avalanche(h64);

      case 30: PROCESS8_64;

                    /* fallthrough */

      case 22: PROCESS8_64;

                    /* fallthrough */

      case 14: PROCESS8_64;

                    /* fallthrough */

      case  6: PROCESS4_64;

               PROCESS1_64;

               PROCESS1_64;

               return XXH64_avalanche(h64);

      case 27: PROCESS8_64;

                    /* fallthrough */

      case 19: PROCESS8_64;

                    /* fallthrough */

      case 11: PROCESS8_64;

               PROCESS1_64;

               PROCESS1_64;

               PROCESS1_64;

               return XXH64_avalanche(h64);

      case 31: PROCESS8_64;

                    /* fallthrough */

      case 23: PROCESS8_64;

                    /* fallthrough */

      case 15: PROCESS8_64;

                    /* fallthrough */

      case  7: PROCESS4_64;

                    /* fallthrough */

      case  3: PROCESS1_64;

                    /* fallthrough */

      case  2: PROCESS1_64;

                    /* fallthrough */

      case  1: PROCESS1_64;

                    /* fallthrough */

      case  0: return XXH64_avalanche(h64);

    }

    /* impossible to reach */

    assert(0);

    return 0;  /* unreachable, but some compilers complain without it */

}

FORCE_INLINE U64

XXH64_endian_align(const void* input, size_t len, U64 seed,

                XXH_endianness endian, XXH_alignment align)

{

    const BYTE* p = (const BYTE*)input;

    const BYTE* bEnd = p + len;

    U64 h64;

#if defined(XXH_ACCEPT_NULL_INPUT_POINTER) && (XXH_ACCEPT_NULL_INPUT_POINTER>=1)

    if (p==NULL) {

        len=0;

        bEnd=p=(const BYTE*)(size_t)32;

    }

#endif

    if (len>=32) {

        const BYTE* const limit = bEnd - 32;

        U64 v1 = seed + PRIME64_1 + PRIME64_2;

        U64 v2 = seed + PRIME64_2;

        U64 v3 = seed + 0;

        U64 v4 = seed - PRIME64_1;

        do {

            v1 = XXH64_round(v1, XXH_get64bits(p)); p+=8;

            v2 = XXH64_round(v2, XXH_get64bits(p)); p+=8;

            v3 = XXH64_round(v3, XXH_get64bits(p)); p+=8;

            v4 = XXH64_round(v4, XXH_get64bits(p)); p+=8;

        } while (p<=limit);

        h64 = XXH_rotl64(v1, 1) + XXH_rotl64(v2, 7) + XXH_rotl64(v3, 12) + XXH_rotl64(v4, 18);

        h64 = XXH64_mergeRound(h64, v1);

        h64 = XXH64_mergeRound(h64, v2);

        h64 = XXH64_mergeRound(h64, v3);

        h64 = XXH64_mergeRound(h64, v4);

    } else {

        h64  = seed + PRIME64_5;

    }

    h64 += (U64) len;

    return XXH64_finalize(h64, p, len, endian, align);

}

XXH_PUBLIC_API unsigned long long XXH64 (const void* input, size_t len, unsigned long long seed)

{

#if 0

    /* Simple version, good for code maintenance, but unfortunately slow for small inputs */

    XXH64_state_t state;

    XXH64_reset(&state, seed);

    XXH64_update(&state, input, len);

    return XXH64_digest(&state);

#else

    XXH_endianness endian_detected = (XXH_endianness)XXH_CPU_LITTLE_ENDIAN;

    if (XXH_FORCE_ALIGN_CHECK) {

        if ((((size_t)input) & 7)==0) {  /* Input is aligned, let's leverage the speed advantage */

            if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

                return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_aligned);

            else

                return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_aligned);

    }   }

    if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)

        return XXH64_endian_align(input, len, seed, XXH_littleEndian, XXH_unaligned);

    else

        return XXH64_endian_align(input, len, seed, XXH_bigEndian, XXH_unaligned);

#endif

}

/*======   Hash Streaming   ======*/

XXH_PUBLIC_API XXH64_state_t* XXH64_createState(void)

{

    return (XXH64_state_t*)XXH_malloc(sizeof(XXH64_state_t));

}

XXH_PUBLIC_API XXH_errorcode XXH64_freeState(XXH64_state_t* statePtr)

{

    XXH_free(statePtr);

    return XXH_OK;

}

XXH_PUBLIC_API void XXH64_copyState(XXH64_state_t* dstState, const XXH64_state_t* srcState)

{

    memcpy(dstState, srcState, sizeof(*dstState));

}

XXH_PUBLIC_API XXH_errorcode XXH64_reset(XXH64_state_t* statePtr, unsigned long long seed)

{

    XXH64_state_t state;   /* using a local state to memcpy() in order to avoid strict-aliasing warnings */

    memset(&state, 0, sizeof(state));

    state.v1 = seed + PRIME64_1 + PRIME64_2;

    state.v2 = seed + PRIME64_2;

    state.v3 = seed + 0;

    state.v4 = seed - PRIME64_1;

     /* do not write into reserved, planned to be removed in a future version */

    memcpy(statePtr, &state, sizeof(state) - sizeof(state.reserved));

    return XXH_OK;

}

FORCE_INLINE XXH_errorcode

XXH64_update_endian (XXH64_state_t* state, const void* input, size_t len, XXH_endianness endian)

{

    if (input==NULL)

#if defined(XXH_ACCEPT_NULL_INPUT_POINTER) && (XXH_ACCEPT_NULL_INPUT_POINTER>=1)

        return XXH_OK;

#else

        return XXH_ERROR;

#endif

    {   const BYTE* p = (const BYTE*)input;

        const BYTE* const bEnd = p + len;

        state->total_len += len;

        if (state->memsize + len < 32) {  /* fill in tmp buffer */

            XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, len);

            state->memsize += (U32)len;

            return XXH_OK;

        }

        if (state->memsize) {   /* tmp buffer is full */

            XXH_memcpy(((BYTE*)state->mem64) + state->memsize, input, 32-state->memsize);

            state->v1 = XXH64_round(state->v1, XXH_readLE64(state->mem64+0, endian));

            state->v2 = XXH64_round(state->v2, XXH_readLE64(state->mem64+1, endian));

            state->v3 = XXH64_round(state->v3, XXH_readLE64(state->mem64+2, endian));

            state->v4 = XXH64_round(state->v4, XXH_readLE64(state->mem64+3, endian));

            p += 32-state->memsize;

            state->memsize = 0;

        }

        if (p+32 <= bEnd) {

            const BYTE* const limit = bEnd - 32;

            U64 v1 = state->v1;

            U64 v2 = state->v2;

            U64 v3 = state->v3;

            U64 v4 = state->v4;