The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/hash.h

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    1 /*      $NetBSD: hash.h,v 1.6 2008/04/28 20:24:10 martin Exp $  */
    2 
    3 /*-
    4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Luke Mewburn.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #ifndef _SYS_HASH_H_
   33 #define _SYS_HASH_H_
   34 
   35 #include <sys/types.h>
   36 #ifdef __HAVE_MACHINE_HASH_H
   37 #include <machine/hash.h>
   38 #endif
   39 
   40 
   41 #ifndef __HAVE_HASH32_BUF                       /* not overridden by MD hash */
   42 
   43 #define HASH32_BUF_INIT 5381
   44 
   45 /*
   46  * uint32_t
   47  * hash32_buf(const void *bf, size_t len, uint32_t hash)
   48  *      return a 32 bit hash of the binary buffer buf (size len),
   49  *      seeded with an initial hash value of hash (usually HASH32_BUF_INIT).
   50  */
   51 static __inline uint32_t
   52 hash32_buf(const void *bf, size_t len, uint32_t hash)
   53 {
   54         const uint8_t *s = bf;
   55 
   56         while (len-- != 0)                      /* "nemesi": k=257, r=r*257 */
   57                 hash = hash * 257 + *s++;
   58         return (hash * 257);
   59 }
   60 #endif  /* __HAVE_HASH32_BUF */
   61 
   62 
   63 #ifndef __HAVE_HASH32_STR                       /* not overridden by MD hash */
   64 
   65 #define HASH32_STR_INIT 5381
   66 /*
   67  * uint32_t
   68  * hash32_str(const void *bf, uint32_t hash)
   69  *      return a 32 bit hash of NUL terminated ASCII string buf,
   70  *      seeded with an initial hash value of hash (usually HASH32_STR_INIT).
   71  */
   72 static __inline uint32_t
   73 hash32_str(const void *bf, uint32_t hash)
   74 {
   75         const uint8_t *s = bf;
   76         uint8_t c;
   77 
   78         while ((c = *s++) != 0)
   79                 hash = hash * 33 + c;           /* "perl": k=33, r=r+r/32 */
   80         return (hash + (hash >> 5));
   81 }
   82 
   83 /*
   84  * uint32_t
   85  * hash32_strn(const void *bf, size_t len, uint32_t hash)
   86  *      return a 32 bit hash of NUL terminated ASCII string buf up to
   87  *      a maximum of len bytes,
   88  *      seeded with an initial hash value of hash (usually HASH32_STR_INIT).
   89  */
   90 static __inline uint32_t
   91 hash32_strn(const void *bf, size_t len, uint32_t hash)
   92 {
   93         const uint8_t   *s = bf;
   94         uint8_t c;
   95 
   96         while ((c = *s++) != 0 && len-- != 0)
   97                 hash = hash * 33 + c;           /* "perl": k=33, r=r+r/32 */
   98         return (hash + (hash >> 5));
   99 }
  100 #endif  /* __HAVE_HASH32_STR */
  101 
  102 
  103 #endif  /* !_SYS_HASH_H_ */

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