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3918 | Serge | 1 | /***************************************************************************/ |
2 | /* */ |
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3 | /* otvbase.c */ |
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4 | /* */ |
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5 | /* OpenType BASE table validation (body). */ |
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6 | /* */ |
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7 | /* Copyright 2004, 2007 by */ |
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8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 | /* */ |
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10 | /* This file is part of the FreeType project, and may only be used, */ |
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11 | /* modified, and distributed under the terms of the FreeType project */ |
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12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 | /* this file you indicate that you have read the license and */ |
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14 | /* understand and accept it fully. */ |
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15 | /* */ |
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16 | /***************************************************************************/ |
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17 | |||
18 | |||
19 | #include "otvalid.h" |
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20 | #include "otvcommn.h" |
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21 | |||
22 | |||
23 | /*************************************************************************/ |
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24 | /* */ |
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25 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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26 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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27 | /* messages during execution. */ |
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28 | /* */ |
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29 | #undef FT_COMPONENT |
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30 | #define FT_COMPONENT trace_otvbase |
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31 | |||
32 | |||
33 | static void |
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34 | otv_BaseCoord_validate( FT_Bytes table, |
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35 | OTV_Validator valid ) |
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36 | { |
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37 | FT_Bytes p = table; |
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38 | FT_UInt BaseCoordFormat; |
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39 | |||
40 | |||
41 | OTV_NAME_ENTER( "BaseCoord" ); |
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42 | |||
43 | OTV_LIMIT_CHECK( 4 ); |
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44 | BaseCoordFormat = FT_NEXT_USHORT( p ); |
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45 | p += 2; /* skip Coordinate */ |
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46 | |||
47 | OTV_TRACE(( " (format %d)\n", BaseCoordFormat )); |
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48 | |||
49 | switch ( BaseCoordFormat ) |
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50 | { |
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51 | case 1: /* BaseCoordFormat1 */ |
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52 | break; |
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53 | |||
54 | case 2: /* BaseCoordFormat2 */ |
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55 | OTV_LIMIT_CHECK( 4 ); /* ReferenceGlyph, BaseCoordPoint */ |
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56 | break; |
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57 | |||
58 | case 3: /* BaseCoordFormat3 */ |
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59 | OTV_LIMIT_CHECK( 2 ); |
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60 | /* DeviceTable */ |
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61 | otv_Device_validate( table + FT_NEXT_USHORT( p ), valid ); |
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62 | break; |
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63 | |||
64 | default: |
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65 | FT_INVALID_FORMAT; |
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66 | } |
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67 | |||
68 | OTV_EXIT; |
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69 | } |
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70 | |||
71 | |||
72 | static void |
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73 | otv_BaseTagList_validate( FT_Bytes table, |
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74 | OTV_Validator valid ) |
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75 | { |
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76 | FT_Bytes p = table; |
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77 | FT_UInt BaseTagCount; |
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78 | |||
79 | |||
80 | OTV_NAME_ENTER( "BaseTagList" ); |
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81 | |||
82 | OTV_LIMIT_CHECK( 2 ); |
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83 | |||
84 | BaseTagCount = FT_NEXT_USHORT( p ); |
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85 | |||
86 | OTV_TRACE(( " (BaseTagCount = %d)\n", BaseTagCount )); |
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87 | |||
88 | OTV_LIMIT_CHECK( BaseTagCount * 4 ); /* BaselineTag */ |
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89 | |||
90 | OTV_EXIT; |
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91 | } |
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92 | |||
93 | |||
94 | static void |
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95 | otv_BaseValues_validate( FT_Bytes table, |
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96 | OTV_Validator valid ) |
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97 | { |
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98 | FT_Bytes p = table; |
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99 | FT_UInt BaseCoordCount; |
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100 | |||
101 | |||
102 | OTV_NAME_ENTER( "BaseValues" ); |
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103 | |||
104 | OTV_LIMIT_CHECK( 4 ); |
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105 | |||
106 | p += 2; /* skip DefaultIndex */ |
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107 | BaseCoordCount = FT_NEXT_USHORT( p ); |
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108 | |||
109 | OTV_TRACE(( " (BaseCoordCount = %d)\n", BaseCoordCount )); |
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110 | |||
111 | OTV_LIMIT_CHECK( BaseCoordCount * 2 ); |
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112 | |||
113 | /* BaseCoord */ |
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114 | for ( ; BaseCoordCount > 0; BaseCoordCount-- ) |
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115 | otv_BaseCoord_validate( table + FT_NEXT_USHORT( p ), valid ); |
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116 | |||
117 | OTV_EXIT; |
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118 | } |
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119 | |||
120 | |||
121 | static void |
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122 | otv_MinMax_validate( FT_Bytes table, |
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123 | OTV_Validator valid ) |
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124 | { |
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125 | FT_Bytes p = table; |
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126 | FT_UInt table_size; |
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127 | FT_UInt FeatMinMaxCount; |
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128 | |||
129 | OTV_OPTIONAL_TABLE( MinCoord ); |
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130 | OTV_OPTIONAL_TABLE( MaxCoord ); |
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131 | |||
132 | |||
133 | OTV_NAME_ENTER( "MinMax" ); |
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134 | |||
135 | OTV_LIMIT_CHECK( 6 ); |
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136 | |||
137 | OTV_OPTIONAL_OFFSET( MinCoord ); |
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138 | OTV_OPTIONAL_OFFSET( MaxCoord ); |
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139 | FeatMinMaxCount = FT_NEXT_USHORT( p ); |
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140 | |||
141 | OTV_TRACE(( " (FeatMinMaxCount = %d)\n", FeatMinMaxCount )); |
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142 | |||
143 | table_size = FeatMinMaxCount * 8 + 6; |
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144 | |||
145 | OTV_SIZE_CHECK( MinCoord ); |
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146 | if ( MinCoord ) |
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147 | otv_BaseCoord_validate( table + MinCoord, valid ); |
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148 | |||
149 | OTV_SIZE_CHECK( MaxCoord ); |
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150 | if ( MaxCoord ) |
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151 | otv_BaseCoord_validate( table + MaxCoord, valid ); |
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152 | |||
153 | OTV_LIMIT_CHECK( FeatMinMaxCount * 8 ); |
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154 | |||
155 | /* FeatMinMaxRecord */ |
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156 | for ( ; FeatMinMaxCount > 0; FeatMinMaxCount-- ) |
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157 | { |
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158 | p += 4; /* skip FeatureTableTag */ |
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159 | |||
160 | OTV_OPTIONAL_OFFSET( MinCoord ); |
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161 | OTV_OPTIONAL_OFFSET( MaxCoord ); |
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162 | |||
163 | OTV_SIZE_CHECK( MinCoord ); |
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164 | if ( MinCoord ) |
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165 | otv_BaseCoord_validate( table + MinCoord, valid ); |
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166 | |||
167 | OTV_SIZE_CHECK( MaxCoord ); |
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168 | if ( MaxCoord ) |
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169 | otv_BaseCoord_validate( table + MaxCoord, valid ); |
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170 | } |
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171 | |||
172 | OTV_EXIT; |
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173 | } |
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174 | |||
175 | |||
176 | static void |
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177 | otv_BaseScript_validate( FT_Bytes table, |
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178 | OTV_Validator valid ) |
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179 | { |
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180 | FT_Bytes p = table; |
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181 | FT_UInt table_size; |
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182 | FT_UInt BaseLangSysCount; |
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183 | |||
184 | OTV_OPTIONAL_TABLE( BaseValues ); |
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185 | OTV_OPTIONAL_TABLE( DefaultMinMax ); |
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186 | |||
187 | |||
188 | OTV_NAME_ENTER( "BaseScript" ); |
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189 | |||
190 | OTV_LIMIT_CHECK( 6 ); |
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191 | OTV_OPTIONAL_OFFSET( BaseValues ); |
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192 | OTV_OPTIONAL_OFFSET( DefaultMinMax ); |
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193 | BaseLangSysCount = FT_NEXT_USHORT( p ); |
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194 | |||
195 | OTV_TRACE(( " (BaseLangSysCount = %d)\n", BaseLangSysCount )); |
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196 | |||
197 | table_size = BaseLangSysCount * 6 + 6; |
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198 | |||
199 | OTV_SIZE_CHECK( BaseValues ); |
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200 | if ( BaseValues ) |
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201 | otv_BaseValues_validate( table + BaseValues, valid ); |
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202 | |||
203 | OTV_SIZE_CHECK( DefaultMinMax ); |
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204 | if ( DefaultMinMax ) |
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205 | otv_MinMax_validate( table + DefaultMinMax, valid ); |
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206 | |||
207 | OTV_LIMIT_CHECK( BaseLangSysCount * 6 ); |
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208 | |||
209 | /* BaseLangSysRecord */ |
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210 | for ( ; BaseLangSysCount > 0; BaseLangSysCount-- ) |
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211 | { |
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212 | p += 4; /* skip BaseLangSysTag */ |
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213 | |||
214 | otv_MinMax_validate( table + FT_NEXT_USHORT( p ), valid ); |
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215 | } |
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216 | |||
217 | OTV_EXIT; |
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218 | } |
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219 | |||
220 | |||
221 | static void |
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222 | otv_BaseScriptList_validate( FT_Bytes table, |
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223 | OTV_Validator valid ) |
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224 | { |
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225 | FT_Bytes p = table; |
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226 | FT_UInt BaseScriptCount; |
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227 | |||
228 | |||
229 | OTV_NAME_ENTER( "BaseScriptList" ); |
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230 | |||
231 | OTV_LIMIT_CHECK( 2 ); |
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232 | BaseScriptCount = FT_NEXT_USHORT( p ); |
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233 | |||
234 | OTV_TRACE(( " (BaseScriptCount = %d)\n", BaseScriptCount )); |
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235 | |||
236 | OTV_LIMIT_CHECK( BaseScriptCount * 6 ); |
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237 | |||
238 | /* BaseScriptRecord */ |
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239 | for ( ; BaseScriptCount > 0; BaseScriptCount-- ) |
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240 | { |
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241 | p += 4; /* skip BaseScriptTag */ |
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242 | |||
243 | /* BaseScript */ |
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244 | otv_BaseScript_validate( table + FT_NEXT_USHORT( p ), valid ); |
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245 | } |
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246 | |||
247 | OTV_EXIT; |
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248 | } |
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249 | |||
250 | |||
251 | static void |
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252 | otv_Axis_validate( FT_Bytes table, |
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253 | OTV_Validator valid ) |
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254 | { |
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255 | FT_Bytes p = table; |
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256 | FT_UInt table_size; |
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257 | |||
258 | OTV_OPTIONAL_TABLE( BaseTagList ); |
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259 | |||
260 | |||
261 | OTV_NAME_ENTER( "Axis" ); |
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262 | |||
263 | OTV_LIMIT_CHECK( 4 ); |
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264 | OTV_OPTIONAL_OFFSET( BaseTagList ); |
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265 | |||
266 | table_size = 4; |
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267 | |||
268 | OTV_SIZE_CHECK( BaseTagList ); |
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269 | if ( BaseTagList ) |
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270 | otv_BaseTagList_validate( table + BaseTagList, valid ); |
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271 | |||
272 | /* BaseScriptList */ |
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273 | otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), valid ); |
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274 | |||
275 | OTV_EXIT; |
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276 | } |
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277 | |||
278 | |||
279 | FT_LOCAL_DEF( void ) |
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280 | otv_BASE_validate( FT_Bytes table, |
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281 | FT_Validator ftvalid ) |
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282 | { |
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283 | OTV_ValidatorRec validrec; |
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284 | OTV_Validator valid = &validrec; |
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285 | FT_Bytes p = table; |
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286 | FT_UInt table_size; |
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287 | |||
288 | OTV_OPTIONAL_TABLE( HorizAxis ); |
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289 | OTV_OPTIONAL_TABLE( VertAxis ); |
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290 | |||
291 | |||
292 | valid->root = ftvalid; |
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293 | |||
294 | FT_TRACE3(( "validating BASE table\n" )); |
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295 | OTV_INIT; |
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296 | |||
297 | OTV_LIMIT_CHECK( 6 ); |
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298 | |||
299 | if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
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300 | FT_INVALID_FORMAT; |
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301 | |||
302 | table_size = 6; |
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303 | |||
304 | OTV_OPTIONAL_OFFSET( HorizAxis ); |
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305 | OTV_SIZE_CHECK( HorizAxis ); |
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306 | if ( HorizAxis ) |
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307 | otv_Axis_validate( table + HorizAxis, valid ); |
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308 | |||
309 | OTV_OPTIONAL_OFFSET( VertAxis ); |
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310 | OTV_SIZE_CHECK( VertAxis ); |
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311 | if ( VertAxis ) |
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312 | otv_Axis_validate( table + VertAxis, valid ); |
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313 | |||
314 | FT_TRACE4(( "\n" )); |
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315 | } |
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316 | |||
317 | |||
318 | /* END */ |