30 lines
832 B
C
30 lines
832 B
C
/*
|
|
------------------------------------------------------------------------------
|
|
By Bob Jenkins, September 1996.
|
|
lookupa.h, a hash function for table lookup, same function as lookup.c.
|
|
Use this code in any way you wish. Public Domain. It has no warranty.
|
|
Source is http://burtleburtle.net/bob/c/lookupa.h
|
|
------------------------------------------------------------------------------
|
|
*/
|
|
|
|
/* Uncommented by Jens Jakobsen 20020717
|
|
#ifndef STANDARD
|
|
#include "standard.h"
|
|
#endif
|
|
*/
|
|
|
|
#ifndef LOOKUPA
|
|
#define LOOKUPA
|
|
|
|
typedef unsigned long int ub4; /* unsigned 4-byte quantities */
|
|
typedef unsigned char ub1;
|
|
|
|
#define CHECKSTATE 8
|
|
#define hashsize(n) ((ub4)1<<(n))
|
|
#define hashmask(n) (hashsize(n)-1)
|
|
|
|
ub4 lookup( /*_ ub1 *k, ub4 length, ub4 level _*/ );
|
|
void checksum( /*_ ub1 *k, ub4 length, ub4 *state _*/ );
|
|
|
|
#endif /* LOOKUPA */
|