各種字符串hash

[cpp] 
unsigned int SDBMHash(char *str){ 
    unsigned int hash = 0;  
    while (*str) {  
    // equivalent to:  
        hash = 65599*hash + (*str++); 
         hash = (*str++) + (hash << 6) + (hash << 16) - hash;  
      }  
    return (hash & 0x7FFFFFFF); 
    }  
// RS Hash Function  
unsigned int RSHash(char *str){ 
     unsigned int b = 378551;  
        unsigned int a = 63689; 
       unsigned int hash = 0; 
        while (*str) {  
        hash = hash * a + (*str++); a *= b; 
       }  
    return (hash & 0x7FFFFFFF); 
}  
// JS Hash Function  
unsigned int JSHash(char *str){ 
  unsigned int hash = 1315423911;  
   while (*str) {  
    hash ^= ((hash << 5) + (*str++) + (hash >> 2));  
   }  
  return (hash & 0x7FFFFFFF); 
}  
// P. J. Weinberger Hash Function  
unsigned int PJWHash(char *str){ 
    unsigned int BitsInUnignedInt = (unsigned int)(sizeof(unsigned int) * 8);  
        unsigned int ThreeQuarters = (unsigned int)((BitsInUnignedInt * 3) / 4);  
          unsigned int OneEighth = (unsigned int)(BitsInUnignedInt / 8);  
        unsigned int HighBits = (unsigned int)(0xFFFFFFFF) << (BitsInUnignedInt - OneEighth);  
    unsigned int hash = 0;  
        unsigned int test = 0;  
      while (*str) { 
       hash = (hash << OneEighth) + (*str++);  
       if ((test = hash & HighBits) != 0 { 
        hash = ((hash ^ (test >> ThreeQuarters)) & (~HighBits));  
        }  
      } 
     return (hash & 0x7FFFFFFF); 
   } 
 // ELF Hash Function  
unsigned int ELFHash(char *str){ 
     unsigned int hash = 0; 
          unsigned int x = 0; 
       while (*str) { 
          hash = (hash << 4) + (*str++); 
              if ((x = hash & 0xF0000000L) != 0) { 
                     hash ^= (x >> 24); 
                    hash &= ~x; 
                  } 
          }  
    return (hash & 0x7FFFFFFF); 
 } 
 // BKDR Hash Function  
unsigned int BKDRHash(char *str){ 
    unsigned int seed = 131;  
    // 31 131 1313 13131 131313 etc..   
    unsigned int hash = 0;  
    while (*str) { 
         hash = hash * seed + (*str++); 
     }  
    return (hash & 0x7FFFFFFF); 
}  
// DJB Hash Function  
unsigned int DJBHash(char *str){  
        unsigned int hash = 5381;  
          while (*str) {  
             hash += (hash << 5) + (*str++); 
          }  
    return (hash & 0x7FFFFFFF); 
}  
// AP Hash Function  
unsigned int APHash(char *str){ 
     unsigned int hash = 0;  
         int i;  
      for (i=0; *str; i++) { 
            if ((i & 1) == 0) {  
                hash ^= ((hash << 7) ^ (*str++) ^ (hash >> 3));  
            }        
            else { 
                 hash ^= (~((hash << 11) ^ (*str++) ^ (hash >> 5)));  
                 }  
      } 
      return (hash & 0x7FFFFFFF); 
} 

unsigned int SDBMHash(char *str){
  unsigned int hash = 0;
  while (*str) {
  // equivalent to:
    hash = 65599*hash + (*str++);
     hash = (*str++) + (hash << 6) + (hash << 16) - hash;
    }
    return (hash & 0x7FFFFFFF);
    }
// RS Hash Function
unsigned int RSHash(char *str){
  unsigned int b = 378551;
   unsigned int a = 63689;
    unsigned int hash = 0;
     while (*str) {
     hash = hash * a + (*str++); a *= b;
    }
    return (hash & 0x7FFFFFFF);
}
// JS Hash Function
unsigned int JSHash(char *str){
  unsigned int hash = 1315423911;
   while (*str) {
    hash ^= ((hash << 5) + (*str++) + (hash >> 2));
   }
  return (hash & 0x7FFFFFFF);
}
// P. J. Weinberger Hash Function
unsigned int PJWHash(char *str){
  unsigned int BitsInUnignedInt = (unsigned int)(sizeof(unsigned int) * 8);
   unsigned int ThreeQuarters = (unsigned int)((BitsInUnignedInt * 3) / 4);
     unsigned int OneEighth = (unsigned int)(BitsInUnignedInt / 8);
   unsigned int HighBits = (unsigned int)(0xFFFFFFFF) << (BitsInUnignedInt - OneEighth);
  unsigned int hash = 0;
   unsigned int test = 0;
    while (*str) {
     hash = (hash << OneEighth) + (*str++);
     if ((test = hash & HighBits) != 0 {
      hash = ((hash ^ (test >> ThreeQuarters)) & (~HighBits));
      }
    }
     return (hash & 0x7FFFFFFF);
   }
 // ELF Hash Function
unsigned int ELFHash(char *str){
   unsigned int hash = 0;
     unsigned int x = 0;
     while (*str) {
       hash = (hash << 4) + (*str++);
         if ((x = hash & 0xF0000000L) != 0) {
           hash ^= (x >> 24);
            hash &= ~x;
             }
        }
  return (hash & 0x7FFFFFFF);
 }
 // BKDR Hash Function
unsigned int BKDRHash(char *str){
 unsigned int seed = 131;
 // 31 131 1313 13131 131313 etc..
 unsigned int hash = 0;
 while (*str) {
   hash = hash * seed + (*str++);
  }
    return (hash & 0x7FFFFFFF);
}
// DJB Hash Function
unsigned int DJBHash(char *str){
  unsigned int hash = 5381;
    while (*str) {
      hash += (hash << 5) + (*str++);
    }
 return (hash & 0x7FFFFFFF);
}
// AP Hash Function
unsigned int APHash(char *str){
  unsigned int hash = 0;
   int i;
   for (i=0; *str; i++) {
      if ((i & 1) == 0) {
       hash ^= ((hash << 7) ^ (*str++) ^ (hash >> 3));
      }      
      else {
        hash ^= (~((hash << 11) ^ (*str++) ^ (hash >> 5)));
           }
   }
      return (hash & 0x7FFFFFFF);
}