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annotate libfdproto/ostr.c @ 706:4ffbc9f1e922

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Large UNTESTED commit with the following changes: * Improved DiameterIdentity handling (esp. interationalization issues), and improve efficiency of some string operations in peers, sessions, and dictionary modules (closes #7) * Cleanup in the session module to free only unreferenced sessions (#16) * Removed fd_cpu_flush_cache(), replaced by more robust alternatives. * Improved peer state machine algorithm to counter SCTP multistream race condition.
author Sebastien Decugis <sdecugis@nict.go.jp>
date Wed, 09 Feb 2011 15:26:58 +0900
parents
children e387d5c6b6f5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
706
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1 /*********************************************************************************************************
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2 * Software License Agreement (BSD License) *
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3 * Author: Sebastien Decugis <sdecugis@nict.go.jp> *
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4 * *
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5 * Copyright (c) 2011, WIDE Project and NICT *
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6 * All rights reserved. *
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7 * *
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8 * Redistribution and use of this software in source and binary forms, with or without modification, are *
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9 * permitted provided that the following conditions are met: *
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10 * *
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11 * * Redistributions of source code must retain the above *
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12 * copyright notice, this list of conditions and the *
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13 * following disclaimer. *
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14 * *
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15 * * Redistributions in binary form must reproduce the above *
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16 * copyright notice, this list of conditions and the *
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17 * following disclaimer in the documentation and/or other *
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18 * materials provided with the distribution. *
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19 * *
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20 * * Neither the name of the WIDE Project or NICT nor the *
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21 * names of its contributors may be used to endorse or *
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22 * promote products derived from this software without *
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23 * specific prior written permission of WIDE Project and *
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24 * NICT. *
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25 * *
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26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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28 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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29 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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30 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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32 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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34 *********************************************************************************************************/
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35
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36 #include "fdproto-internal.h"
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37
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38 /* Similar to strdup with (must be verified) os0_t */
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39 os0_t os0dup_int(os0_t s, size_t l) {
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40 os0_t r;
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41 CHECK_MALLOC_DO( r = calloc(l+1, 1), return NULL );
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42 memcpy(r, s, l); /* this might be faster than a strcpy or strdup because it can work with 32 or 64b blocks */
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43 return r;
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44 }
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45
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46 /* case sensitive comparison, fast */
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47 int fd_os_cmp_int(uint8_t * os1, size_t os1sz, uint8_t * os2, size_t os2sz)
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48 {
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49 ASSERT( os1 && os2);
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50 if (os1sz < os2sz)
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51 return -1;
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52 if (os1sz > os2sz)
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53 return 1;
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54 return memcmp(os1, os2, os1sz);
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55 }
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56
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57 /* a local version of tolower() that does not depend on LC_CTYPE locale */
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58 static inline uint8_t asciitolower(uint8_t a)
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59 {
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60 if ((a >= 'A') && (a <= 'Z'))
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61 return a + 32 /* == 'a' - 'A' */;
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62 return a;
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63 }
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64
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65 /* a little less sensitive to case, slower. */
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66 int fd_os_almostcasecmp_int(uint8_t * os1, size_t os1sz, uint8_t * os2, size_t os2sz)
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67 {
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68 int i;
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69 ASSERT( os1 && os2);
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70 if (os1sz < os2sz)
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71 return -1;
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72 if (os1sz > os2sz)
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73 return 1;
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74
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75 for (i = 0; i < os1sz; i++) {
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76 if (os1[i] == os2[i])
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77 continue;
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78
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79 if (asciitolower(os1[i]) == asciitolower(os2[i]))
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80 continue;
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81
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82 return os1[i] < os2[i] ? -1 : 1;
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83 }
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84
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85 return 0;
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86 }
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87
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88 /* Check if the string contains only ASCII */
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89 int fd_os_is_valid_DiameterIdentity(uint8_t * os, size_t ossz)
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90 {
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91 int i;
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92
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93 /* Allow letters, digits, hyphen, dot */
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94 for (i=0; i < ossz; i++) {
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95 if (os[i] > 'z')
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96 break;
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97 if (os[i] >= 'a')
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98 continue;
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99 if ((os[i] >= 'A') && (os[i] <= 'Z'))
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100 continue;
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101 if ((os[i] == '-') || (os[i] == '.'))
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102 continue;
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103 if ((os[i] >= '0') && (os[i] <= '9'))
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104 continue;
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105 break;
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106 }
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107 if (i < ossz) {
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108 TRACE_DEBUG(INFO, "Invalid character '%c' in DiameterIdentity '%.*s'", os[i], ossz, os);
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109 return 0;
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110 }
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111 return 1;
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112 }
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113
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114 /* The following function validates a string as a Diameter Identity or applies the IDNA transformation on it */
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115 int fd_os_validate_DiameterIdentity(char ** id, size_t * outsz, int memory /* 0: *id can be realloc'd. 1: *id must be malloc'd on output (was static) */)
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116 {
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117 TRACE_ENTRY("%p %p", id, outsz);
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118
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119 *outsz = strlen(*id);
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120
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121 if (!fd_os_is_valid_DiameterIdentity((os0_t)*id, *outsz)) {
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122 char buf[HOST_NAME_MAX];
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123
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124 TODO("Stringprep in into buf");
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125 TRACE_DEBUG(INFO, "The string '%s' is not a valid DiameterIdentity, it was changed to '%s'", *id, buf);
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126 TODO("Realloc *id if !memory");
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127 /* copy buf */
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128 /* update the size */
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129 return ENOTSUP;
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130 } else {
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131 if (memory == 1) {
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132 CHECK_MALLOC( *id = os0dup(*id, *outsz) );
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133 }
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134 }
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135 return 0;
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136 }
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137
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138
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139
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140
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141
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142 /********************************************************************************************************/
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143 /* Hash function -- credits to Austin Appleby, thank you ^^ */
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144 /* See http://murmurhash.googlepages.com for more information on this function */
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145
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146 /* the strings are NOT always aligned properly (ex: received in RADIUS message), so we use the aligned MurmurHash2 function as needed */
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147 #define _HASH_MIX(h,k,m) { k *= m; k ^= k >> r; k *= m; h *= m; h ^= k; }
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148 uint32_t fd_os_hash ( uint8_t * string, size_t len )
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149 {
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150 uint32_t hash = len;
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151 uint8_t * data = string;
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152
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153 const unsigned int m = 0x5bd1e995;
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154 const int r = 24;
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155 int align = (long)string & 3;
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156
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157 if (!align || (len < 4)) {
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158 /* In case data is aligned, MurmurHash2 function */
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159 while(len >= 4)
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160 {
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161 /* Mix 4 bytes at a time into the hash */
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162 uint32_t k = *(uint32_t *)data; /* We don't care about the byte order */
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163
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164 _HASH_MIX(hash, k, m);
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165
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166 data += 4;
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167 len -= 4;
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168 }
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169
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170 /* Handle the last few bytes of the input */
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171 switch(len) {
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172 case 3: hash ^= data[2] << 16;
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173 case 2: hash ^= data[1] << 8;
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174 case 1: hash ^= data[0];
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175 hash *= m;
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176 }
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177
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178 } else {
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179 /* Unaligned data, use alignment-safe slower version */
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180
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181 /* Pre-load the temp registers */
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182 uint32_t t = 0, d = 0;
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183 switch(align)
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184 {
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185 case 1: t |= data[2] << 16;
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186 case 2: t |= data[1] << 8;
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187 case 3: t |= data[0];
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188 }
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189 t <<= (8 * align);
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190
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191 data += 4-align;
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192 len -= 4-align;
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193
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194 /* From this point, "data" can be read by chunks of 4 bytes */
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195
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196 int sl = 8 * (4-align);
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197 int sr = 8 * align;
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198
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199 /* Mix */
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200 while(len >= 4)
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201 {
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202 uint32_t k;
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203
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204 d = *(unsigned int *)data;
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205 k = (t >> sr) | (d << sl);
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206
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207 _HASH_MIX(hash, k, m);
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208
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209 t = d;
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210
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211 data += 4;
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212 len -= 4;
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213 }
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214
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215 /* Handle leftover data in temp registers */
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216 d = 0;
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217 if(len >= align)
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218 {
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219 uint32_t k;
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220
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221 switch(align)
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222 {
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223 case 3: d |= data[2] << 16;
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224 case 2: d |= data[1] << 8;
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225 case 1: d |= data[0];
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226 }
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227
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228 k = (t >> sr) | (d << sl);
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229 _HASH_MIX(hash, k, m);
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230
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231 data += align;
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232 len -= align;
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233
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234 /* Handle tail bytes */
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235
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236 switch(len)
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237 {
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238 case 3: hash ^= data[2] << 16;
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239 case 2: hash ^= data[1] << 8;
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240 case 1: hash ^= data[0];
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241 hash *= m;
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242 };
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243 }
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244 else
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245 {
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246 switch(len)
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247 {
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248 case 3: d |= data[2] << 16;
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249 case 2: d |= data[1] << 8;
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250 case 1: d |= data[0];
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251 case 0: hash ^= (t >> sr) | (d << sl);
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252 hash *= m;
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253 }
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254 }
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255
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256
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257 }
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258
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259 /* Do a few final mixes of the hash to ensure the last few
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260 bytes are well-incorporated. */
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261 hash ^= hash >> 13;
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262 hash *= m;
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263 hash ^= hash >> 15;
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264
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265 return hash;
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266 }
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267
"Welcome to our mercurial repository"