text: /*
  Open Asset Import Library (assimp)
  ----------------------------------------------------------------------
  
  Copyright (c) 2006-2016, assimp team
  All rights reserved.
  
  Redistribution and use of this software 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.
  
  * Neither the name of the assimp team, nor the names of its
    contributors may be used to endorse or promote products
    derived from this software without specific prior
    written permission of the assimp team.
  
  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.
  
  ----------------------------------------------------------------------
  */
  
  #ifndef AI_HASH_H_INCLUDED
  #define AI_HASH_H_INCLUDED
  
  #include <stdint.h>
  #include <string.h>
  
  // ------------------------------------------------------------------------------------------------
  // Hashing function taken from
  // http://www.azillionmonkeys.com/qed/hash.html
  // (incremental version)
  //
  // This code is Copyright 2004-2008 by Paul Hsieh. It is used here in the belief that
  // Assimp's license is considered compatible with Pauls's derivative license as specified
  // on his web page.
  //
  // (stdint.h should have been been included here)
  // ------------------------------------------------------------------------------------------------
  #undef get16bits
  #if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
    || defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
  #define get16bits(d) (*((const uint16_t *) (d)))
  #endif
  
  #if !defined (get16bits)
  #define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8)\
                         +(uint32_t)(((const uint8_t *)(d))[0]) )
  #endif
  
  // ------------------------------------------------------------------------------------------------
  inline uint32_t SuperFastHash (const char * data, uint32_t len = 0, uint32_t hash = 0) {
  uint32_t tmp;
  int rem;
  
      if (!data) return 0;
      if (!len)len = (uint32_t)::strlen(data);
  
      rem = len & 3;
      len >>= 2;
  
      /* Main loop */
      for (;len > 0; len--) {
          hash  += get16bits (data);
          tmp    = (get16bits (data+2) << 11) ^ hash;
          hash   = (hash << 16) ^ tmp;
          data  += 2*sizeof (uint16_t);
          hash  += hash >> 11;
      }
  
      /* Handle end cases */
      switch (rem) {
          case 3: hash += get16bits (data);
                  hash ^= hash << 16;
                  hash ^= data[sizeof (uint16_t)] << 18;
                  hash += hash >> 11;
                  break;
          case 2: hash += get16bits (data);
                  hash ^= hash << 11;
                  hash += hash >> 17;
                  break;
          case 1: hash += *data;
                  hash ^= hash << 10;
                  hash += hash >> 1;
      }
  
      /* Force "avalanching" of final 127 bits */
      hash ^= hash << 3;
      hash += hash >> 5;
      hash ^= hash << 4;
      hash += hash >> 17;
      hash ^= hash << 25;
      hash += hash >> 6;
  
      return hash;
  }
  
  #endif // !! AI_HASH_H_INCLUDED
  