Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/dbm/src/h_func.c @ 4:b513267f632f tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 150b72113545
children
rev   line source
3
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
1 /*-
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
2 * Copyright (c) 1990, 1993
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
3 * The Regents of the University of California. All rights reserved.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
4 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
5 * This code is derived from software contributed to Berkeley by
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
6 * Margo Seltzer.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
7 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
8 * Redistribution and use in source and binary forms, with or without
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
9 * modification, are permitted provided that the following conditions
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
10 * are met:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
11 * 1. Redistributions of source code must retain the above copyright
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
12 * notice, this list of conditions and the following disclaimer.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
13 * 2. Redistributions in binary form must reproduce the above copyright
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
14 * notice, this list of conditions and the following disclaimer in the
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
15 * documentation and/or other materials provided with the distribution.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
16 * 3. ***REMOVED*** - see
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
17 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
18 * 4. Neither the name of the University nor the names of its contributors
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
19 * may be used to endorse or promote products derived from this software
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
20 * without specific prior written permission.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
21 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
32 * SUCH DAMAGE.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
33 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
34
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
35 #if defined(LIBC_SCCS) && !defined(lint)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
36 static char sccsid[] = "@(#)hash_func.c 8.2 (Berkeley) 2/21/94";
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
37 #endif /* LIBC_SCCS and not lint */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
38
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
39 #ifndef macintosh
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
40 #include <sys/types.h>
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
41 #endif
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
42 #include "mcom_db.h"
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
43 #include "hash.h"
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
44 #include "page.h"
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
45 /* #include "extern.h" */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
46
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
47 #if 0
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
48 static uint32 hash1 __P((const void *, size_t));
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
49 static uint32 hash2 __P((const void *, size_t));
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
50 static uint32 hash3 __P((const void *, size_t));
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
51 #endif
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
52 static uint32 hash4 __P((const void *, size_t));
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
53
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
54 /* Global default hash function */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
55 uint32 (*__default_hash) __P((const void *, size_t)) = hash4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
56
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
57 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
58 * HASH FUNCTIONS
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
59 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
60 * Assume that we've already split the bucket to which this key hashes,
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
61 * calculate that bucket, and check that in fact we did already split it.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
62 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
63 * This came from ejb's hsearch.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
64 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
65
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
66 #define PRIME1 37
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
67 #define PRIME2 1048583
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
68
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
69 #if 0
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
70 static uint32
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
71 hash1(const void *keyarg, register size_t len)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
72 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
73 register const uint8 *key;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
74 register uint32 h;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
75
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
76 /* Convert string to integer */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
77 for (key = (const uint8 *)keyarg, h = 0; len--;)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
78 h = h * PRIME1 ^ (*key++ - ' ');
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
79 h %= PRIME2;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
80 return (h);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
81 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
82
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
83 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
84 * Phong's linear congruential hash
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
85 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
86 #define dcharhash(h, c) ((h) = 0x63c63cd9*(h) + 0x9c39c33d + (c))
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
87
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
88 static uint32
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
89 hash2(const void *keyarg, size_t len)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
90 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
91 register const uint8 *e, *key;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
92 register uint32 h;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
93 register uint8 c;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
94
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
95 key = (const uint8 *)keyarg;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
96 e = key + len;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
97 for (h = 0; key != e;) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
98 c = *key++;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
99 if (!c && key > e)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
100 break;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
101 dcharhash(h, c);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
102 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
103 return (h);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
104 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
105
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
106 /*
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
107 * This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
108 * units. On the first time through the loop we get the "leftover bytes"
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
109 * (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
110 * all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
111 * this routine is heavily used enough, it's worth the ugly coding.
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
112 *
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
113 * OZ's original sdbm hash
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
114 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
115 static uint32
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
116 hash3(const void *keyarg, register size_t len)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
117 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
118 register const uint8 *key;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
119 register size_t loop;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
120 register uint32 h;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
121
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
122 #define HASHC h = *key++ + 65599 * h
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
123
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
124 h = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
125 key = (const uint8 *)keyarg;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
126 if (len > 0) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
127 loop = (len + 8 - 1) >> 3;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
128
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
129 switch (len & (8 - 1)) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
130 case 0:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
131 do {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
132 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
133 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
134 case 7:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
135 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 case 6:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
138 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
139 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140 case 5:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
142 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143 case 4:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
144 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
145 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
146 case 3:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
147 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
148 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
149 case 2:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
152 case 1:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
153 HASHC;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
154 } while (--loop);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
155 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
156 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
157 return (h);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
159 #endif /* 0 */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 /* Hash function from Chris Torek. */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162 static uint32
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
163 hash4(const void *keyarg, register size_t len)
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
165 register const uint8 *key;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
166 register size_t loop;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
167 register uint32 h;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
168
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
169 #define HASH4a h = (h << 5) - h + *key++;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
170 #define HASH4b h = (h << 5) + h + *key++;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
171 #define HASH4 HASH4b
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
172
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
173 h = 0;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
174 key = (const uint8 *)keyarg;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175 if (len > 0) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
176 loop = (len + 8 - 1) >> 3;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
178 switch (len & (8 - 1)) {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
179 case 0:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180 do {
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
181 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
182 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
183 case 7:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
184 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
185 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 case 6:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189 case 5:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
190 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
191 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
192 case 4:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
193 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
194 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
195 case 3:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
196 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
197 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
198 case 2:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
199 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
200 /* FALLTHROUGH */
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
201 case 1:
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
202 HASH4;
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
203 } while (--loop);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
204 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
205 }
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
206 return (h);
150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
207 }
This site is hosted by Intevation GmbH (Datenschutzerklärung und Impressum | Privacy Policy and Imprint)