1 /***************************************************************************/ |
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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 |
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18 |
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19 #include "otvalid.h" |
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20 #include "otvcommn.h" |
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21 |
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22 |
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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 |
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32 |
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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 |
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40 |
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41 OTV_NAME_ENTER( "BaseCoord" ); |
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42 |
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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 |
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47 OTV_TRACE(( " (format %d)\n", BaseCoordFormat )); |
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48 |
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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 |
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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 |
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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 |
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64 default: |
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65 FT_INVALID_FORMAT; |
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66 } |
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67 |
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68 OTV_EXIT; |
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69 } |
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70 |
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71 |
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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 |
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79 |
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80 OTV_NAME_ENTER( "BaseTagList" ); |
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81 |
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82 OTV_LIMIT_CHECK( 2 ); |
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83 |
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84 BaseTagCount = FT_NEXT_USHORT( p ); |
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85 |
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86 OTV_TRACE(( " (BaseTagCount = %d)\n", BaseTagCount )); |
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87 |
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88 OTV_LIMIT_CHECK( BaseTagCount * 4 ); /* BaselineTag */ |
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89 |
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90 OTV_EXIT; |
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91 } |
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92 |
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93 |
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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 |
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101 |
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102 OTV_NAME_ENTER( "BaseValues" ); |
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103 |
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104 OTV_LIMIT_CHECK( 4 ); |
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105 |
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106 p += 2; /* skip DefaultIndex */ |
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107 BaseCoordCount = FT_NEXT_USHORT( p ); |
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108 |
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109 OTV_TRACE(( " (BaseCoordCount = %d)\n", BaseCoordCount )); |
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110 |
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111 OTV_LIMIT_CHECK( BaseCoordCount * 2 ); |
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112 |
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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 |
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117 OTV_EXIT; |
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118 } |
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119 |
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120 |
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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 |
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129 OTV_OPTIONAL_TABLE( MinCoord ); |
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130 OTV_OPTIONAL_TABLE( MaxCoord ); |
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131 |
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132 |
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133 OTV_NAME_ENTER( "MinMax" ); |
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134 |
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135 OTV_LIMIT_CHECK( 6 ); |
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136 |
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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 |
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141 OTV_TRACE(( " (FeatMinMaxCount = %d)\n", FeatMinMaxCount )); |
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142 |
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143 table_size = FeatMinMaxCount * 8 + 6; |
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144 |
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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 |
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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 |
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153 OTV_LIMIT_CHECK( FeatMinMaxCount * 8 ); |
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154 |
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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 |
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160 OTV_OPTIONAL_OFFSET( MinCoord ); |
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161 OTV_OPTIONAL_OFFSET( MaxCoord ); |
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162 |
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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 |
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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 |
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172 OTV_EXIT; |
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173 } |
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174 |
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175 |
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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 |
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184 OTV_OPTIONAL_TABLE( BaseValues ); |
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185 OTV_OPTIONAL_TABLE( DefaultMinMax ); |
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186 |
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187 |
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188 OTV_NAME_ENTER( "BaseScript" ); |
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189 |
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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 |
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195 OTV_TRACE(( " (BaseLangSysCount = %d)\n", BaseLangSysCount )); |
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196 |
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197 table_size = BaseLangSysCount * 6 + 6; |
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198 |
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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 |
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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 |
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207 OTV_LIMIT_CHECK( BaseLangSysCount * 6 ); |
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208 |
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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 |
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214 otv_MinMax_validate( table + FT_NEXT_USHORT( p ), valid ); |
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215 } |
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216 |
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217 OTV_EXIT; |
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218 } |
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219 |
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220 |
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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 |
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228 |
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229 OTV_NAME_ENTER( "BaseScriptList" ); |
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230 |
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231 OTV_LIMIT_CHECK( 2 ); |
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232 BaseScriptCount = FT_NEXT_USHORT( p ); |
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233 |
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234 OTV_TRACE(( " (BaseScriptCount = %d)\n", BaseScriptCount )); |
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235 |
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236 OTV_LIMIT_CHECK( BaseScriptCount * 6 ); |
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237 |
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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 |
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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 |
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247 OTV_EXIT; |
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248 } |
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249 |
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250 |
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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 |
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258 OTV_OPTIONAL_TABLE( BaseTagList ); |
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259 |
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260 |
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261 OTV_NAME_ENTER( "Axis" ); |
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262 |
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263 OTV_LIMIT_CHECK( 4 ); |
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264 OTV_OPTIONAL_OFFSET( BaseTagList ); |
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265 |
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266 table_size = 4; |
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267 |
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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 |
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272 /* BaseScriptList */ |
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273 otv_BaseScriptList_validate( table + FT_NEXT_USHORT( p ), valid ); |
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274 |
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275 OTV_EXIT; |
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276 } |
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277 |
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278 |
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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 |
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288 OTV_OPTIONAL_TABLE( HorizAxis ); |
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289 OTV_OPTIONAL_TABLE( VertAxis ); |
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290 |
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291 |
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292 valid->root = ftvalid; |
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293 |
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294 FT_TRACE3(( "validating BASE table\n" )); |
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295 OTV_INIT; |
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296 |
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297 OTV_LIMIT_CHECK( 6 ); |
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298 |
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299 if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
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300 FT_INVALID_FORMAT; |
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301 |
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302 table_size = 6; |
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303 |
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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 |
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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 |
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314 FT_TRACE4(( "\n" )); |
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315 } |
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316 |
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317 |
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318 /* END */ |
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