1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvmort.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT mort table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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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 /* */ |
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20 /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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21 /* Development of gxlayout is supported by the Information-technology */ |
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22 /* Promotion Agency(IPA), Japan. */ |
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23 /* */ |
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24 /***************************************************************************/ |
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25 |
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26 |
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27 #include "gxvmort.h" |
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28 #include "gxvfeat.h" |
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29 |
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30 |
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31 /*************************************************************************/ |
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32 /* */ |
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33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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35 /* messages during execution. */ |
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36 /* */ |
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37 #undef FT_COMPONENT |
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38 #define FT_COMPONENT trace_gxvmort |
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39 |
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40 |
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41 static void |
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42 gxv_mort_feature_validate( GXV_mort_feature f, |
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43 GXV_Validator valid ) |
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44 { |
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45 if ( f->featureType >= gxv_feat_registry_length ) |
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46 { |
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47 GXV_TRACE(( "featureType %d is out of registered range, " |
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48 "setting %d is unchecked\n", |
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49 f->featureType, f->featureSetting )); |
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50 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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51 FT_INVALID_DATA; |
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52 } |
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53 else if ( !gxv_feat_registry[f->featureType].existence ) |
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54 { |
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55 GXV_TRACE(( "featureType %d is within registered area " |
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56 "but undefined, setting %d is unchecked\n", |
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57 f->featureType, f->featureSetting )); |
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58 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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59 FT_INVALID_DATA; |
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60 } |
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61 else |
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62 { |
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63 FT_Byte nSettings_max; |
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64 |
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65 |
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66 /* nSettings in gxvfeat.c is halved for exclusive on/off settings */ |
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67 nSettings_max = gxv_feat_registry[f->featureType].nSettings; |
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68 if ( gxv_feat_registry[f->featureType].exclusive ) |
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69 nSettings_max = (FT_Byte)( 2 * nSettings_max ); |
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70 |
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71 GXV_TRACE(( "featureType %d is registered", f->featureType )); |
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72 GXV_TRACE(( "setting %d", f->featureSetting )); |
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73 |
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74 if ( f->featureSetting > nSettings_max ) |
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75 { |
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76 GXV_TRACE(( "out of defined range %d", nSettings_max )); |
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77 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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78 FT_INVALID_DATA; |
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79 } |
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80 GXV_TRACE(( "\n" )); |
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81 } |
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82 |
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83 /* TODO: enableFlags must be unique value in specified chain? */ |
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84 } |
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85 |
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86 |
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87 /* |
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88 * nFeatureFlags is typed to FT_ULong to accept that in |
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89 * mort (typed FT_UShort) and morx (typed FT_ULong). |
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90 */ |
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91 FT_LOCAL_DEF( void ) |
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92 gxv_mort_featurearray_validate( FT_Bytes table, |
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93 FT_Bytes limit, |
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94 FT_ULong nFeatureFlags, |
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95 GXV_Validator valid ) |
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96 { |
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97 FT_Bytes p = table; |
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98 FT_ULong i; |
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99 |
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100 GXV_mort_featureRec f = GXV_MORT_FEATURE_OFF; |
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101 |
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102 |
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103 GXV_NAME_ENTER( "mort feature list" ); |
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104 for ( i = 0; i < nFeatureFlags; i++ ) |
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105 { |
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106 GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 ); |
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107 f.featureType = FT_NEXT_USHORT( p ); |
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108 f.featureSetting = FT_NEXT_USHORT( p ); |
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109 f.enableFlags = FT_NEXT_ULONG( p ); |
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110 f.disableFlags = FT_NEXT_ULONG( p ); |
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111 |
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112 gxv_mort_feature_validate( &f, valid ); |
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113 } |
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114 |
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115 if ( !IS_GXV_MORT_FEATURE_OFF( f ) ) |
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116 FT_INVALID_DATA; |
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117 |
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118 valid->subtable_length = p - table; |
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119 GXV_EXIT; |
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120 } |
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121 |
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122 |
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123 FT_LOCAL_DEF( void ) |
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124 gxv_mort_coverage_validate( FT_UShort coverage, |
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125 GXV_Validator valid ) |
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126 { |
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127 FT_UNUSED( valid ); |
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128 |
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129 if ( coverage & 0x8000U ) |
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130 GXV_TRACE(( " this subtable is for vertical text only\n" )); |
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131 else |
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132 GXV_TRACE(( " this subtable is for horizontal text only\n" )); |
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133 |
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134 if ( coverage & 0x4000 ) |
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135 GXV_TRACE(( " this subtable is applied to glyph array " |
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136 "in descending order\n" )); |
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137 else |
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138 GXV_TRACE(( " this subtable is applied to glyph array " |
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139 "in ascending order\n" )); |
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140 |
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141 if ( coverage & 0x2000 ) |
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142 GXV_TRACE(( " this subtable is forcibly applied to " |
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143 "vertical/horizontal text\n" )); |
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144 |
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145 if ( coverage & 0x1FF8 ) |
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146 GXV_TRACE(( " coverage has non-zero bits in reserved area\n" )); |
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147 } |
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148 |
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149 |
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150 static void |
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151 gxv_mort_subtables_validate( FT_Bytes table, |
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152 FT_Bytes limit, |
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153 FT_UShort nSubtables, |
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154 GXV_Validator valid ) |
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155 { |
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156 FT_Bytes p = table; |
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157 |
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158 GXV_Validate_Func fmt_funcs_table[] = |
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159 { |
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160 gxv_mort_subtable_type0_validate, /* 0 */ |
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161 gxv_mort_subtable_type1_validate, /* 1 */ |
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162 gxv_mort_subtable_type2_validate, /* 2 */ |
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163 NULL, /* 3 */ |
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164 gxv_mort_subtable_type4_validate, /* 4 */ |
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165 gxv_mort_subtable_type5_validate, /* 5 */ |
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166 |
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167 }; |
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168 |
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169 GXV_Validate_Func func; |
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170 FT_UShort i; |
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171 |
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172 |
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173 GXV_NAME_ENTER( "subtables in a chain" ); |
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174 |
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175 for ( i = 0; i < nSubtables; i++ ) |
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176 { |
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177 FT_UShort length; |
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178 FT_UShort coverage; |
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179 FT_ULong subFeatureFlags; |
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180 FT_UInt type; |
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181 FT_UInt rest; |
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182 |
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183 |
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184 GXV_LIMIT_CHECK( 2 + 2 + 4 ); |
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185 length = FT_NEXT_USHORT( p ); |
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186 coverage = FT_NEXT_USHORT( p ); |
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187 subFeatureFlags = FT_NEXT_ULONG( p ); |
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188 |
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189 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", |
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190 i + 1, nSubtables, length )); |
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191 type = coverage & 0x0007; |
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192 rest = length - ( 2 + 2 + 4 ); |
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193 |
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194 GXV_LIMIT_CHECK( rest ); |
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195 gxv_mort_coverage_validate( coverage, valid ); |
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196 |
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197 if ( type > 5 ) |
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198 FT_INVALID_FORMAT; |
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199 |
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200 func = fmt_funcs_table[type]; |
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201 if ( func == NULL ) |
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202 GXV_TRACE(( "morx type %d is reserved\n", type )); |
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203 |
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204 func( p, p + rest, valid ); |
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205 |
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206 p += rest; |
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207 } |
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208 |
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209 valid->subtable_length = p - table; |
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210 |
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211 GXV_EXIT; |
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212 } |
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213 |
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214 |
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215 static void |
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216 gxv_mort_chain_validate( FT_Bytes table, |
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217 FT_Bytes limit, |
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218 GXV_Validator valid ) |
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219 { |
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220 FT_Bytes p = table; |
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221 FT_ULong defaultFlags; |
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222 FT_ULong chainLength; |
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223 FT_UShort nFeatureFlags; |
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224 FT_UShort nSubtables; |
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225 |
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226 |
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227 GXV_NAME_ENTER( "mort chain header" ); |
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228 |
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229 GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 ); |
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230 defaultFlags = FT_NEXT_ULONG( p ); |
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231 chainLength = FT_NEXT_ULONG( p ); |
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232 nFeatureFlags = FT_NEXT_USHORT( p ); |
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233 nSubtables = FT_NEXT_USHORT( p ); |
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234 |
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235 gxv_mort_featurearray_validate( p, table + chainLength, |
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236 nFeatureFlags, valid ); |
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237 p += valid->subtable_length; |
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238 gxv_mort_subtables_validate( p, table + chainLength, nSubtables, valid ); |
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239 valid->subtable_length = chainLength; |
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240 |
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241 GXV_EXIT; |
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242 } |
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243 |
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244 |
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245 FT_LOCAL_DEF( void ) |
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246 gxv_mort_validate( FT_Bytes table, |
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247 FT_Face face, |
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248 FT_Validator ftvalid ) |
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249 { |
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250 GXV_ValidatorRec validrec; |
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251 GXV_Validator valid = &validrec; |
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252 FT_Bytes p = table; |
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253 FT_Bytes limit = 0; |
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254 FT_ULong version; |
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255 FT_ULong nChains; |
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256 FT_ULong i; |
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257 |
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258 |
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259 valid->root = ftvalid; |
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260 valid->face = face; |
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261 limit = valid->root->limit; |
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262 |
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263 FT_TRACE3(( "validating `mort' table\n" )); |
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264 GXV_INIT; |
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265 |
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266 GXV_LIMIT_CHECK( 4 + 4 ); |
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267 version = FT_NEXT_ULONG( p ); |
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268 nChains = FT_NEXT_ULONG( p ); |
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269 |
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270 if (version != 0x00010000UL) |
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271 FT_INVALID_FORMAT; |
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272 |
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273 for ( i = 0; i < nChains; i++ ) |
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274 { |
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275 GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains )); |
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276 GXV_32BIT_ALIGNMENT_VALIDATE( p - table ); |
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277 gxv_mort_chain_validate( p, limit, valid ); |
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278 p += valid->subtable_length; |
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279 } |
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280 |
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281 FT_TRACE4(( "\n" )); |
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282 } |
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283 |
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284 |
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285 /* END */ |
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