1 /***************************************************************************/ |
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2 /* */ |
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3 /* otvgdef.c */ |
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4 /* */ |
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5 /* OpenType GDEF table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2004, 2005, 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_otvgdef |
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31 |
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32 |
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33 /*************************************************************************/ |
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34 /*************************************************************************/ |
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35 /***** *****/ |
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36 /***** UTILITY FUNCTIONS *****/ |
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37 /***** *****/ |
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38 /*************************************************************************/ |
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39 /*************************************************************************/ |
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40 |
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41 #define AttachListFunc otv_O_x_Ox |
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42 #define LigCaretListFunc otv_O_x_Ox |
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43 |
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44 /* sets valid->extra1 (0) */ |
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45 |
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46 static void |
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47 otv_O_x_Ox( FT_Bytes table, |
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48 OTV_Validator valid ) |
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49 { |
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50 FT_Bytes p = table; |
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51 FT_Bytes Coverage; |
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52 FT_UInt GlyphCount; |
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53 OTV_Validate_Func func; |
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54 |
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55 |
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56 OTV_ENTER; |
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57 |
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58 OTV_LIMIT_CHECK( 4 ); |
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59 Coverage = table + FT_NEXT_USHORT( p ); |
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60 GlyphCount = FT_NEXT_USHORT( p ); |
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61 |
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62 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
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63 |
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64 otv_Coverage_validate( Coverage, valid, GlyphCount ); |
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65 if ( GlyphCount != otv_Coverage_get_count( Coverage ) ) |
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66 FT_INVALID_DATA; |
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67 |
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68 OTV_LIMIT_CHECK( GlyphCount * 2 ); |
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69 |
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70 valid->nesting_level++; |
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71 func = valid->func[valid->nesting_level]; |
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72 valid->extra1 = 0; |
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73 |
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74 for ( ; GlyphCount > 0; GlyphCount-- ) |
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75 func( table + FT_NEXT_USHORT( p ), valid ); |
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76 |
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77 valid->nesting_level--; |
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78 |
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79 OTV_EXIT; |
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80 } |
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81 |
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82 |
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83 /*************************************************************************/ |
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84 /*************************************************************************/ |
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85 /***** *****/ |
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86 /***** LIGATURE CARETS *****/ |
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87 /***** *****/ |
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88 /*************************************************************************/ |
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89 /*************************************************************************/ |
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90 |
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91 #define CaretValueFunc otv_CaretValue_validate |
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92 |
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93 static void |
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94 otv_CaretValue_validate( FT_Bytes table, |
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95 OTV_Validator valid ) |
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96 { |
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97 FT_Bytes p = table; |
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98 FT_UInt CaretValueFormat; |
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99 |
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100 |
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101 OTV_ENTER; |
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102 |
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103 OTV_LIMIT_CHECK( 4 ); |
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104 |
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105 CaretValueFormat = FT_NEXT_USHORT( p ); |
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106 |
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107 OTV_TRACE(( " (format = %d)\n", CaretValueFormat )); |
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108 |
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109 switch ( CaretValueFormat ) |
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110 { |
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111 case 1: /* CaretValueFormat1 */ |
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112 /* skip Coordinate, no test */ |
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113 break; |
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114 |
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115 case 2: /* CaretValueFormat2 */ |
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116 /* skip CaretValuePoint, no test */ |
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117 break; |
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118 |
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119 case 3: /* CaretValueFormat3 */ |
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120 p += 2; /* skip Coordinate */ |
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121 |
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122 OTV_LIMIT_CHECK( 2 ); |
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123 |
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124 /* DeviceTable */ |
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125 otv_Device_validate( table + FT_NEXT_USHORT( p ), valid ); |
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126 break; |
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127 |
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128 default: |
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129 FT_INVALID_FORMAT; |
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130 } |
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131 |
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132 OTV_EXIT; |
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133 } |
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134 |
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135 |
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136 /*************************************************************************/ |
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137 /*************************************************************************/ |
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138 /***** *****/ |
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139 /***** GDEF TABLE *****/ |
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140 /***** *****/ |
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141 /*************************************************************************/ |
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142 /*************************************************************************/ |
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143 |
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144 /* sets valid->glyph_count */ |
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145 |
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146 FT_LOCAL_DEF( void ) |
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147 otv_GDEF_validate( FT_Bytes table, |
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148 FT_Bytes gsub, |
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149 FT_Bytes gpos, |
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150 FT_UInt glyph_count, |
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151 FT_Validator ftvalid ) |
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152 { |
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153 OTV_ValidatorRec validrec; |
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154 OTV_Validator valid = &validrec; |
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155 FT_Bytes p = table; |
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156 FT_UInt table_size; |
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157 FT_Bool need_MarkAttachClassDef; |
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158 |
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159 OTV_OPTIONAL_TABLE( GlyphClassDef ); |
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160 OTV_OPTIONAL_TABLE( AttachListOffset ); |
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161 OTV_OPTIONAL_TABLE( LigCaretListOffset ); |
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162 OTV_OPTIONAL_TABLE( MarkAttachClassDef ); |
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163 |
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164 |
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165 valid->root = ftvalid; |
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166 |
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167 FT_TRACE3(( "validating GDEF table\n" )); |
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168 OTV_INIT; |
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169 |
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170 OTV_LIMIT_CHECK( 12 ); |
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171 |
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172 if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
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173 FT_INVALID_FORMAT; |
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174 |
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175 /* MarkAttachClassDef has been added to the OpenType */ |
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176 /* specification without increasing GDEF's version, */ |
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177 /* so we use this ugly hack to find out whether the */ |
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178 /* table is needed actually. */ |
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179 |
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180 need_MarkAttachClassDef = FT_BOOL( |
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181 otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) || |
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182 otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) ); |
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183 |
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184 if ( need_MarkAttachClassDef ) |
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185 table_size = 12; /* OpenType >= 1.2 */ |
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186 else |
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187 table_size = 10; /* OpenType < 1.2 */ |
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188 |
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189 valid->glyph_count = glyph_count; |
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190 |
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191 OTV_OPTIONAL_OFFSET( GlyphClassDef ); |
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192 OTV_SIZE_CHECK( GlyphClassDef ); |
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193 if ( GlyphClassDef ) |
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194 otv_ClassDef_validate( table + GlyphClassDef, valid ); |
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195 |
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196 OTV_OPTIONAL_OFFSET( AttachListOffset ); |
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197 OTV_SIZE_CHECK( AttachListOffset ); |
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198 if ( AttachListOffset ) |
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199 { |
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200 OTV_NEST2( AttachList, AttachPoint ); |
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201 OTV_RUN( table + AttachListOffset, valid ); |
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202 } |
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203 |
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204 OTV_OPTIONAL_OFFSET( LigCaretListOffset ); |
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205 OTV_SIZE_CHECK( LigCaretListOffset ); |
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206 if ( LigCaretListOffset ) |
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207 { |
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208 OTV_NEST3( LigCaretList, LigGlyph, CaretValue ); |
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209 OTV_RUN( table + LigCaretListOffset, valid ); |
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210 } |
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211 |
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212 if ( need_MarkAttachClassDef ) |
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213 { |
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214 OTV_OPTIONAL_OFFSET( MarkAttachClassDef ); |
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215 OTV_SIZE_CHECK( MarkAttachClassDef ); |
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216 if ( MarkAttachClassDef ) |
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217 otv_ClassDef_validate( table + MarkAttachClassDef, valid ); |
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218 } |
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219 |
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220 FT_TRACE4(( "\n" )); |
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221 } |
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222 |
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223 |
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224 /* END */ |
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