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annotate nss/lib/dbm/src/h_func.c @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +0200
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150b72113545 Add DBM and legacydb support
Andre Heinecke <andre.heinecke@intevation.de>
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1 /*-
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2 * Copyright (c) 1990, 1993
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3 * The Regents of the University of California. All rights reserved.
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4 *
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5 * This code is derived from software contributed to Berkeley by
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6 * Margo Seltzer.
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7 *
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8 * Redistribution and use in source and binary forms, with or without
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9 * modification, are permitted provided that the following conditions
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10 * are met:
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11 * 1. Redistributions of source code must retain the above copyright
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12 * notice, this list of conditions and the following disclaimer.
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13 * 2. Redistributions in binary form must reproduce the above copyright
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14 * notice, this list of conditions and the following disclaimer in the
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15 * documentation and/or other materials provided with the distribution.
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16 * 3. ***REMOVED*** - see
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17 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
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18 * 4. Neither the name of the University nor the names of its contributors
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19 * may be used to endorse or promote products derived from this software
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20 * without specific prior written permission.
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21 *
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22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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32 * SUCH DAMAGE.
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33 */
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34
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35 #if defined(LIBC_SCCS) && !defined(lint)
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36 static char sccsid[] = "@(#)hash_func.c 8.2 (Berkeley) 2/21/94";
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37 #endif /* LIBC_SCCS and not lint */
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38
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39 #ifndef macintosh
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40 #include <sys/types.h>
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41 #endif
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42 #include "mcom_db.h"
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43 #include "hash.h"
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44 #include "page.h"
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45 /* #include "extern.h" */
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46
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47 #if 0
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48 static uint32 hash1 __P((const void *, size_t));
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49 static uint32 hash2 __P((const void *, size_t));
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50 static uint32 hash3 __P((const void *, size_t));
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51 #endif
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52 static uint32 hash4 __P((const void *, size_t));
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53
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54 /* Global default hash function */
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55 uint32 (*__default_hash) __P((const void *, size_t)) = hash4;
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56
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57 /*
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58 * HASH FUNCTIONS
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59 *
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60 * Assume that we've already split the bucket to which this key hashes,
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61 * calculate that bucket, and check that in fact we did already split it.
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62 *
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63 * This came from ejb's hsearch.
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64 */
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65
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66 #define PRIME1 37
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67 #define PRIME2 1048583
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68
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69 #if 0
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70 static uint32
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71 hash1(const void *keyarg, register size_t len)
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72 {
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73 register const uint8 *key;
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74 register uint32 h;
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75
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76 /* Convert string to integer */
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77 for (key = (const uint8 *)keyarg, h = 0; len--;)
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78 h = h * PRIME1 ^ (*key++ - ' ');
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79 h %= PRIME2;
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80 return (h);
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81 }
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82
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83 /*
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84 * Phong's linear congruential hash
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85 */
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86 #define dcharhash(h, c) ((h) = 0x63c63cd9*(h) + 0x9c39c33d + (c))
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87
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88 static uint32
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89 hash2(const void *keyarg, size_t len)
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90 {
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91 register const uint8 *e, *key;
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92 register uint32 h;
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93 register uint8 c;
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94
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95 key = (const uint8 *)keyarg;
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96 e = key + len;
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97 for (h = 0; key != e;) {
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98 c = *key++;
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99 if (!c && key > e)
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100 break;
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101 dcharhash(h, c);
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102 }
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103 return (h);
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104 }
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105
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106 /*
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107 * This is INCREDIBLY ugly, but fast. We break the string up into 8 byte
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108 * units. On the first time through the loop we get the "leftover bytes"
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109 * (strlen % 8). On every other iteration, we perform 8 HASHC's so we handle
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110 * all 8 bytes. Essentially, this saves us 7 cmp & branch instructions. If
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111 * this routine is heavily used enough, it's worth the ugly coding.
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112 *
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113 * OZ's original sdbm hash
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114 */
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115 static uint32
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116 hash3(const void *keyarg, register size_t len)
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117 {
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118 register const uint8 *key;
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119 register size_t loop;
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120 register uint32 h;
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121
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122 #define HASHC h = *key++ + 65599 * h
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123
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124 h = 0;
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125 key = (const uint8 *)keyarg;
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126 if (len > 0) {
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127 loop = (len + 8 - 1) >> 3;
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128
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129 switch (len & (8 - 1)) {
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130 case 0:
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131 do {
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132 HASHC;
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133 /* FALLTHROUGH */
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134 case 7:
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135 HASHC;
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136 /* FALLTHROUGH */
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137 case 6:
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138 HASHC;
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139 /* FALLTHROUGH */
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140 case 5:
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141 HASHC;
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142 /* FALLTHROUGH */
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143 case 4:
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144 HASHC;
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145 /* FALLTHROUGH */
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146 case 3:
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147 HASHC;
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148 /* FALLTHROUGH */
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149 case 2:
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150 HASHC;
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151 /* FALLTHROUGH */
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152 case 1:
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153 HASHC;
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154 } while (--loop);
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155 }
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156 }
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157 return (h);
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158 }
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159 #endif /* 0 */
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160
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161 /* Hash function from Chris Torek. */
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162 static uint32
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163 hash4(const void *keyarg, register size_t len)
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164 {
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165 register const uint8 *key;
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166 register size_t loop;
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167 register uint32 h;
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168
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169 #define HASH4a h = (h << 5) - h + *key++;
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170 #define HASH4b h = (h << 5) + h + *key++;
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171 #define HASH4 HASH4b
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172
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173 h = 0;
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174 key = (const uint8 *)keyarg;
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175 if (len > 0) {
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176 loop = (len + 8 - 1) >> 3;
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177
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178 switch (len & (8 - 1)) {
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179 case 0:
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180 do {
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181 HASH4;
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182 /* FALLTHROUGH */
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183 case 7:
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184 HASH4;
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185 /* FALLTHROUGH */
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186 case 6:
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187 HASH4;
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188 /* FALLTHROUGH */
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189 case 5:
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190 HASH4;
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191 /* FALLTHROUGH */
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192 case 4:
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193 HASH4;
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194 /* FALLTHROUGH */
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195 case 3:
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196 HASH4;
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197 /* FALLTHROUGH */
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198 case 2:
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199 HASH4;
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200 /* FALLTHROUGH */
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201 case 1:
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202 HASH4;
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203 } while (--loop);
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204 }
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205 }
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206 return (h);
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207 }
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