Mercurial > hg > xmms-sid
annotate src/xs_support.c @ 792:bee1f36efc16
Fix potential aliasing issues.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Wed, 07 Nov 2012 10:54:23 +0200 |
parents | 91a36a4b79c6 |
children | 6b47d9813067 |
rev | line source |
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4 | 1 /* |
2 XMMS-SID - SIDPlay input plugin for X MultiMedia System (XMMS) | |
3 | |
4 Miscellaneous support functions | |
5 | |
324 | 6 Programmed and designed by Matti 'ccr' Hamalainen <ccr@tnsp.org> |
723 | 7 (C) Copyright 1999-2009 Tecnic Software productions (TNSP) |
4 | 8 |
9 This program is free software; you can redistribute it and/or modify | |
10 it under the terms of the GNU General Public License as published by | |
11 the Free Software Foundation; either version 2 of the License, or | |
12 (at your option) any later version. | |
13 | |
14 This program is distributed in the hope that it will be useful, | |
15 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 GNU General Public License for more details. | |
18 | |
412
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19 You should have received a copy of the GNU General Public License along |
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20 with this program; if not, write to the Free Software Foundation, Inc., |
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21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
772 | 22 |
23 -- | |
24 Except for the MD5 related functionality at the end of this file. | |
25 -- | |
4 | 26 */ |
49
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27 #include "xs_support.h" |
224
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28 #include <ctype.h> |
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29 #include <glib.h> |
202 | 30 |
226
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31 |
751 | 32 guint16 xs_fread_be16(XSFile *f) |
516
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33 { |
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34 return (((guint16) xs_fgetc(f)) << 8) | ((guint16) xs_fgetc(f)); |
516
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35 } |
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36 |
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37 |
751 | 38 guint32 xs_fread_be32(XSFile *f) |
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39 { |
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40 return |
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41 (((guint32) xs_fgetc(f)) << 24) | |
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42 (((guint32) xs_fgetc(f)) << 16) | |
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43 (((guint32) xs_fgetc(f)) << 8) | |
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44 ((guint32) xs_fgetc(f)); |
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45 } |
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46 |
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47 |
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48 /* Load a file to a buffer, return 0 on success, negative value on error |
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49 */ |
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50 gint xs_fload_buffer(const gchar *filename, guint8 **buf, size_t *bufSize) |
527
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51 { |
751 | 52 XSFile *f; |
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53 glong seekPos; |
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54 |
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55 if (filename == NULL) |
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56 return -15; |
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57 |
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58 if ((f = xs_fopen(filename, "rb")) == NULL) |
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59 return -1; |
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60 |
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61 xs_fseek(f, 0, SEEK_END); |
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62 seekPos = xs_ftell(f); |
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63 |
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64 if (seekPos > 0) |
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65 { |
660
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66 size_t readSize = seekPos; |
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67 if (readSize >= *bufSize || *buf == NULL) |
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68 { |
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69 /* Only re-allocate if the required size > current */ |
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70 if (*buf != NULL) { |
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71 g_free(*buf); |
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72 *buf = NULL; |
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73 } |
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74 |
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75 *bufSize = seekPos; |
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76 |
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77 *buf = (guint8 *) g_malloc(*bufSize * sizeof(guint8)); |
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78 if (*buf == NULL) { |
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79 xs_fclose(f); |
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80 return -2; |
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81 } |
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82 } |
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83 |
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84 /* Read data */ |
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85 xs_fseek(f, 0, SEEK_SET); |
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86 readSize = xs_fread(*buf, sizeof(guint8), *bufSize, f); |
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87 xs_fclose(f); |
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88 |
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89 if (readSize != *bufSize) |
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90 return -3; |
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91 else |
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92 return 0; |
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93 } else { |
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94 xs_fclose(f); |
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95 return -4; |
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96 } |
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97 } |
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98 |
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99 |
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100 /* Copy a given string over in *result. |
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101 */ |
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102 gint xs_pstrcpy(gchar **result, const gchar *str) |
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103 { |
660
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104 /* Check the string pointers */ |
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105 if (!result || !str) |
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106 return -1; |
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107 |
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108 /* Allocate memory for destination */ |
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109 if (*result) |
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110 g_free(*result); |
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111 *result = (gchar *) g_malloc(strlen(str) + 1); |
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112 if (!*result) |
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113 return -2; |
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114 |
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115 /* Copy to the destination */ |
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116 strcpy(*result, str); |
4 | 117 |
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118 return 0; |
4 | 119 } |
120 | |
121 | |
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122 /* Concatenates a given string into string pointed by *result. |
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123 */ |
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124 gint xs_pstrcat(gchar **result, const gchar *str) |
4 | 125 { |
660
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126 /* Check the string pointers */ |
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127 if (!result || !str) |
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128 return -1; |
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129 |
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130 if (*result != NULL) { |
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131 *result = (gchar *) g_realloc(*result, strlen(*result) + strlen(str) + 1); |
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132 if (*result == NULL) |
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133 return -1; |
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134 strcat(*result, str); |
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135 } else { |
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136 *result = (gchar *) g_malloc(strlen(str) + 1); |
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137 if (*result == NULL) |
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138 return -1; |
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139 strcpy(*result, str); |
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140 } |
4 | 141 |
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142 return 0; |
4 | 143 } |
144 | |
145 | |
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146 /* Concatenate a given string up to given dest size or \n. |
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147 * If size max is reached, change the end to "..." |
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148 */ |
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149 void xs_pnstrcat(gchar *dest, size_t iSize, const gchar *str) |
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150 { |
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151 size_t i, n; |
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152 const gchar *s; |
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153 gchar *d; |
359
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154 |
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155 d = dest; |
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156 i = 0; |
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157 while (*d && (i < iSize)) { |
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158 i++; |
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159 d++; |
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160 } |
239
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161 |
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162 s = str; |
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163 while (*s && (*s != '\n') && (i < iSize)) { |
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164 *d = *s; |
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165 d++; |
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166 s++; |
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167 i++; |
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168 } |
359
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169 |
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170 *d = 0; |
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171 |
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172 if (i >= iSize) { |
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173 i--; |
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174 d--; |
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175 n = 3; |
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176 while ((i > 0) && (n > 0)) { |
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177 *d = '.'; |
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178 d--; |
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179 i--; |
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180 n--; |
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181 } |
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182 } |
239
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183 } |
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184 |
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185 |
206
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186 /* Locate character in string |
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187 */ |
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188 void xs_findnext(const gchar *str, size_t *pos) |
4 | 189 { |
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190 while (str[*pos] && isspace(str[*pos])) |
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191 (*pos)++; |
4 | 192 } |
193 | |
194 | |
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195 void xs_findeol(const gchar *str, size_t *pos) |
4 | 196 { |
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197 while (str[*pos] && (str[*pos] != '\n') && (str[*pos] != '\r')) |
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198 (*pos)++; |
4 | 199 } |
200 | |
201 | |
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202 void xs_findnum(const gchar *str, size_t *pos) |
109
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203 { |
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204 while (str[*pos] && isdigit(str[*pos])) |
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205 (*pos)++; |
109
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206 } |
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207 |
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208 |
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209 /* |
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210 * MD5 implementation, modified for XMMS-SID from |
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211 * Colin Plumb's implementation by Matti 'ccr' Hämäläinen. |
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212 * |
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213 * This code implements the MD5 message-digest algorithm. |
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214 * The algorithm is due to Ron Rivest. This code was |
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215 * written by Colin Plumb in 1993, no copyright is claimed. |
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216 * This code is in the public domain; do with it what you wish. |
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217 */ |
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218 |
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219 #if G_BYTE_ORDER == G_LITTLE_ENDIAN |
772 | 220 # define xs_md5_bytereverse(buf, len) /* Nothing */ |
221 #elif G_BYTE_ORDER == G_BIG_ENDIAN | |
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222 static void xs_md5_bytereverse(guint8 *buf, guint l) |
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223 { |
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224 guint32 t; |
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225 do { |
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226 t = (guint32) ((guint) buf[3] << 8 | buf[2]) << 16 | ((guint) buf[1] << 8 | buf[0]); |
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227 *(guint32 *) buf = t; |
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228 buf += sizeof(guint32); |
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229 } while (--l); |
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230 } |
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231 #else |
772 | 232 # error Unsupported endianess! |
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233 #endif |
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234 |
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235 |
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236 /* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious |
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237 * initialization constants. |
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238 */ |
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239 void xs_md5_init(xs_md5state_t *ctx) |
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240 { |
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241 ctx->buf[0] = 0x67452301; |
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242 ctx->buf[1] = 0xefcdab89; |
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243 ctx->buf[2] = 0x98badcfe; |
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244 ctx->buf[3] = 0x10325476; |
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245 |
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246 ctx->bits[0] = 0; |
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247 ctx->bits[1] = 0; |
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248 } |
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249 |
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250 |
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251 /* The core of the MD5 algorithm, this alters an existing MD5 hash to |
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252 * reflect the addition of 16 longwords of new data. xs_md5_update blocks |
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253 * the data and converts bytes into longwords for this routine. |
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254 */ |
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255 #define F1(x, y, z) (z ^ (x & (y ^ z))) |
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256 #define F2(x, y, z) F1(z, x, y) |
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257 #define F3(x, y, z) (x ^ y ^ z) |
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258 #define F4(x, y, z) (y ^ (x | ~z)) |
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259 #define MD5STEP(f, w, x, y, z, data, s) \ |
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260 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) |
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261 |
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262 static void xs_md5_transform(guint32 buf[4], guint32 const in[16]) |
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263 { |
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264 register guint32 a, b, c, d; |
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265 |
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266 a = buf[0]; |
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267 b = buf[1]; |
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268 c = buf[2]; |
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269 d = buf[3]; |
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270 |
772 | 271 MD5STEP(F1, a, b, c, d, in[ 0] + 0xd76aa478, 7); |
272 MD5STEP(F1, d, a, b, c, in[ 1] + 0xe8c7b756, 12); | |
273 MD5STEP(F1, c, d, a, b, in[ 2] + 0x242070db, 17); | |
274 MD5STEP(F1, b, c, d, a, in[ 3] + 0xc1bdceee, 22); | |
275 MD5STEP(F1, a, b, c, d, in[ 4] + 0xf57c0faf, 7); | |
276 MD5STEP(F1, d, a, b, c, in[ 5] + 0x4787c62a, 12); | |
277 MD5STEP(F1, c, d, a, b, in[ 6] + 0xa8304613, 17); | |
278 MD5STEP(F1, b, c, d, a, in[ 7] + 0xfd469501, 22); | |
279 MD5STEP(F1, a, b, c, d, in[ 8] + 0x698098d8, 7); | |
280 MD5STEP(F1, d, a, b, c, in[ 9] + 0x8b44f7af, 12); | |
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281 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); |
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282 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); |
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283 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); |
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284 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); |
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285 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); |
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286 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); |
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287 |
772 | 288 MD5STEP(F2, a, b, c, d, in[ 1] + 0xf61e2562, 5); |
289 MD5STEP(F2, d, a, b, c, in[ 6] + 0xc040b340, 9); | |
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290 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); |
772 | 291 MD5STEP(F2, b, c, d, a, in[ 0] + 0xe9b6c7aa, 20); |
292 MD5STEP(F2, a, b, c, d, in[ 5] + 0xd62f105d, 5); | |
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293 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); |
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294 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); |
772 | 295 MD5STEP(F2, b, c, d, a, in[ 4] + 0xe7d3fbc8, 20); |
296 MD5STEP(F2, a, b, c, d, in[ 9] + 0x21e1cde6, 5); | |
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297 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); |
772 | 298 MD5STEP(F2, c, d, a, b, in[ 3] + 0xf4d50d87, 14); |
299 MD5STEP(F2, b, c, d, a, in[ 8] + 0x455a14ed, 20); | |
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300 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); |
772 | 301 MD5STEP(F2, d, a, b, c, in[ 2] + 0xfcefa3f8, 9); |
302 MD5STEP(F2, c, d, a, b, in[ 7] + 0x676f02d9, 14); | |
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303 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); |
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304 |
772 | 305 MD5STEP(F3, a, b, c, d, in[ 5] + 0xfffa3942, 4); |
306 MD5STEP(F3, d, a, b, c, in[ 8] + 0x8771f681, 11); | |
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307 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); |
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308 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); |
772 | 309 MD5STEP(F3, a, b, c, d, in[ 1] + 0xa4beea44, 4); |
310 MD5STEP(F3, d, a, b, c, in[ 4] + 0x4bdecfa9, 11); | |
311 MD5STEP(F3, c, d, a, b, in[ 7] + 0xf6bb4b60, 16); | |
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312 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); |
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313 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); |
772 | 314 MD5STEP(F3, d, a, b, c, in[ 0] + 0xeaa127fa, 11); |
315 MD5STEP(F3, c, d, a, b, in[ 3] + 0xd4ef3085, 16); | |
316 MD5STEP(F3, b, c, d, a, in[ 6] + 0x04881d05, 23); | |
317 MD5STEP(F3, a, b, c, d, in[ 9] + 0xd9d4d039, 4); | |
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318 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); |
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319 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); |
772 | 320 MD5STEP(F3, b, c, d, a, in[ 2] + 0xc4ac5665, 23); |
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321 |
772 | 322 MD5STEP(F4, a, b, c, d, in[ 0] + 0xf4292244, 6); |
323 MD5STEP(F4, d, a, b, c, in[ 7] + 0x432aff97, 10); | |
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324 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); |
772 | 325 MD5STEP(F4, b, c, d, a, in[ 5] + 0xfc93a039, 21); |
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326 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); |
772 | 327 MD5STEP(F4, d, a, b, c, in[ 3] + 0x8f0ccc92, 10); |
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328 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); |
772 | 329 MD5STEP(F4, b, c, d, a, in[ 1] + 0x85845dd1, 21); |
330 MD5STEP(F4, a, b, c, d, in[ 8] + 0x6fa87e4f, 6); | |
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331 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); |
772 | 332 MD5STEP(F4, c, d, a, b, in[ 6] + 0xa3014314, 15); |
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333 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); |
772 | 334 MD5STEP(F4, a, b, c, d, in[ 4] + 0xf7537e82, 6); |
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335 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); |
772 | 336 MD5STEP(F4, c, d, a, b, in[ 2] + 0x2ad7d2bb, 15); |
337 MD5STEP(F4, b, c, d, a, in[ 9] + 0xeb86d391, 21); | |
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338 |
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339 buf[0] += a; |
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340 buf[1] += b; |
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341 buf[2] += c; |
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342 buf[3] += d; |
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343 } |
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344 |
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345 |
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346 /* Update context to reflect the concatenation of another buffer full |
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347 * of bytes. |
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348 */ |
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349 void xs_md5_append(xs_md5state_t *ctx, const guint8 *buf, guint len) |
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350 { |
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351 guint32 t; |
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352 |
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353 /* Update bitcount */ |
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354 t = ctx->bits[0]; |
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355 if ((ctx->bits[0] = t + ((guint32) len << 3)) < t) |
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356 ctx->bits[1]++; /* Carry from low to high */ |
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357 ctx->bits[1] += len >> 29; |
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358 |
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359 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ |
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360 |
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361 /* Handle any leading odd-sized chunks */ |
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362 if (t) { |
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363 guint8 *p = (guint8 *) ctx->in + t; |
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364 |
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365 t = 64 - t; |
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366 if (len < t) { |
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367 memcpy(p, buf, len); |
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368 return; |
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369 } |
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370 memcpy(p, buf, t); |
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371 xs_md5_bytereverse(ctx->in, 16); |
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372 xs_md5_transform(ctx->buf, (guint32 *) ctx->in); |
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373 buf += t; |
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374 len -= t; |
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375 } |
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376 |
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377 /* Process data in 64-byte chunks */ |
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378 while (len >= 64) { |
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379 memcpy(ctx->in, buf, 64); |
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380 xs_md5_bytereverse(ctx->in, 16); |
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381 xs_md5_transform(ctx->buf, (guint32 *) ctx->in); |
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382 buf += 64; |
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383 len -= 64; |
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384 } |
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385 |
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386 /* Handle any remaining bytes of data. */ |
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387 memcpy(ctx->in, buf, len); |
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388 } |
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389 |
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390 /* Final wrapup - pad to 64-byte boundary with the bit pattern |
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391 * 1 0* (64-bit count of bits processed, MSB-first) |
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392 */ |
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393 void xs_md5_finish(xs_md5state_t *ctx, xs_md5hash_t digest) |
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394 { |
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395 guint count; |
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396 guint8 *p; |
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397 |
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398 /* Compute number of bytes mod 64 */ |
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399 count = (ctx->bits[0] >> 3) & 0x3F; |
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400 |
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401 /* Set the first char of padding to 0x80. This is safe since there is |
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402 always at least one byte free */ |
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403 p = ctx->in + count; |
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404 *p++ = 0x80; |
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405 |
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406 /* Bytes of padding needed to make 64 bytes */ |
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407 count = 64 - 1 - count; |
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408 |
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409 /* Pad out to 56 mod 64 */ |
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410 if (count < 8) { |
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411 /* Two lots of padding: Pad the first block to 64 bytes */ |
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412 memset(p, 0, count); |
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413 xs_md5_bytereverse(ctx->in, 16); |
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414 xs_md5_transform(ctx->buf, (guint32 *) ctx->in); |
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415 |
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416 /* Now fill the next block with 56 bytes */ |
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417 memset(ctx->in, 0, 56); |
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418 } else { |
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419 /* Pad block to 56 bytes */ |
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420 memset(p, 0, count - 8); |
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421 } |
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422 xs_md5_bytereverse(ctx->in, 14); |
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423 |
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424 /* Append length in bits and transform */ |
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425 memcpy(((guint32 *) ctx->in) + 14, &ctx->bits[0], sizeof(guint32)); |
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426 memcpy(((guint32 *) ctx->in) + 15, &ctx->bits[1], sizeof(guint32)); |
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427 |
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428 xs_md5_transform(ctx->buf, (guint32 *) ctx->in); |
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429 xs_md5_bytereverse((guint8 *) ctx->buf, 4); |
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430 memcpy(digest, ctx->buf, 16); |
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431 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ |
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432 } |