kc3-lang/angle/src/common/third_party/xxhash/xxhash.c

Branch - branch -main

• Show log

  Commit

• Hash : c7217aaa
  Author :
  Date : 2020-08-28T14:45:14
  

  Enable -Wbad-function-cast.
  
  Fixes a small bug in xxhash.
  
  Bug: skia:7647
  Change-Id: Ibd0bd8dc4febfe585e257786d9683ea09c94ec6a
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2376718
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  

Download

• src/common/third_party/xxhash/xxhash.c

• /*
  *  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
  ***************************************/
  #ifdef _MSC_VER    /* Visual Studio */
  #  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 */
  #    ifdef __GNUC__
  #      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_endianess;
  
  /* 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_endianess 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_endianess 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)  do { enum { XXH_sa = 1/(int)(!!(c)) }; } while(0) /* 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;   /* 0b10011110001101110111100110110001 */
  static const U32 PRIME32_2 = 2246822519U;   /* 0b10000101111010111100101001110111 */
  static const U32 PRIME32_3 = 3266489917U;   /* 0b11000010101100101010111000111101 */
  static const U32 PRIME32_4 =  668265263U;   /* 0b00100111110101001110101100101111 */
  static const U32 PRIME32_5 =  374761393U;   /* 0b00010110010101100110011110110001 */
  
  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_endianess 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_endianess 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_endianess endian_detected = (XXH_endianess)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_endianess 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_endianess endian_detected = (XXH_endianess)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_endianess 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_endianess endian_detected = (XXH_endianess)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_endianess 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_endianess 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;   /* 0b1001111000110111011110011011000110000101111010111100101010000111 */
  static const U64 PRIME64_2 = 14029467366897019727ULL;   /* 0b1100001010110010101011100011110100100111110101001110101101001111 */
  static const U64 PRIME64_3 =  1609587929392839161ULL;   /* 0b0001011001010110011001111011000110011110001101110111100111111001 */
  static const U64 PRIME64_4 =  9650029242287828579ULL;   /* 0b1000010111101011110010100111011111000010101100101010111001100011 */
  static const U64 PRIME64_5 =  2870177450012600261ULL;   /* 0b0010011111010100111010110010111100010110010101100110011111000101 */
  
  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_endianess 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 do {        \
      U64 const k1 = XXH64_round(0, XXH_get64bits(p)); \
      p+=8;                    \
      h64 ^= k1;               \
      h64  = XXH_rotl64(h64,27) * PRIME64_1 + PRIME64_4; \
  } while (0)
  
      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_endianess 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_endianess endian_detected = (XXH_endianess)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_endianess 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;
  
              do {
                  v1 = XXH64_round(v1, XXH_readLE64(p, endian)); p+=8;
                  v2 = XXH64_round(v2, XXH_readLE64(p, endian)); p+=8;
                  v3 = XXH64_round(v3, XXH_readLE64(p, endian)); p+=8;
                  v4 = XXH64_round(v4, XXH_readLE64(p, endian)); p+=8;
              } while (p<=limit);
  
              state->v1 = v1;
              state->v2 = v2;
              state->v3 = v3;
              state->v4 = v4;
          }
  
          if (p < bEnd) {
              XXH_memcpy(state->mem64, p, (size_t)(bEnd-p));
              state->memsize = (unsigned)(bEnd-p);
          }
      }
  
      return XXH_OK;
  }
  
  XXH_PUBLIC_API XXH_errorcode XXH64_update (XXH64_state_t* state_in, const void* input, size_t len)
  {
      XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
  
      if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
          return XXH64_update_endian(state_in, input, len, XXH_littleEndian);
      else
          return XXH64_update_endian(state_in, input, len, XXH_bigEndian);
  }
  
  FORCE_INLINE U64 XXH64_digest_endian (const XXH64_state_t* state, XXH_endianess endian)
  {
      U64 h64;
  
      if (state->total_len >= 32) {
          U64 const v1 = state->v1;
          U64 const v2 = state->v2;
          U64 const v3 = state->v3;
          U64 const v4 = state->v4;
  
          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  = state->v3 /*seed*/ + PRIME64_5;
      }
  
      h64 += (U64) state->total_len;
  
      return XXH64_finalize(h64, state->mem64, (size_t)state->total_len, endian, XXH_aligned);
  }
  
  XXH_PUBLIC_API unsigned long long XXH64_digest (const XXH64_state_t* state_in)
  {
      XXH_endianess endian_detected = (XXH_endianess)XXH_CPU_LITTLE_ENDIAN;
  
      if ((endian_detected==XXH_littleEndian) || XXH_FORCE_NATIVE_FORMAT)
          return XXH64_digest_endian(state_in, XXH_littleEndian);
      else
          return XXH64_digest_endian(state_in, XXH_bigEndian);
  }
  
  
  /*====== Canonical representation   ======*/
  
  XXH_PUBLIC_API void XXH64_canonicalFromHash(XXH64_canonical_t* dst, XXH64_hash_t hash)
  {
      XXH_STATIC_ASSERT(sizeof(XXH64_canonical_t) == sizeof(XXH64_hash_t));
      if (XXH_CPU_LITTLE_ENDIAN) hash = XXH_swap64(hash);
      memcpy(dst, &hash, sizeof(*dst));
  }
  
  XXH_PUBLIC_API XXH64_hash_t XXH64_hashFromCanonical(const XXH64_canonical_t* src)
  {
      return XXH_readBE64(src);
  }
  
  #endif  /* XXH_NO_LONG_LONG */
  

Download