2 * Copyright (c) 2013, Joseph Koshy
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * An implementation of the Fowler-Noll-Vo hash function.
31 * - http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
32 * - http://www.isthe.com/chongo/tech/comp/fnv/
35 #include <sys/types.h>
39 #include "_libelftc.h"
41 ELFTC_VCSID("$Id: libelftc_hash.c 2870 2013-01-07 10:38:43Z jkoshy $");
44 * Use the size of an 'int' to determine the magic numbers used by the
48 #if INT_MAX == 2147483647UL
49 #define FNV_PRIME 16777619UL
50 #define FNV_OFFSET 2166136261UL
51 #elif INT_MAX == 18446744073709551615ULL
52 #define FNV_PRIME 1099511628211ULL
53 #define FNV_OFFSET 14695981039346656037ULL
55 #error sizeof(int) is unknown.
59 libelftc_hash_string(const char *s)
64 for (hash = FNV_OFFSET; (c = *s) != '\0'; s++) {