1 /***************************************************************************/ |
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2 /* */ |
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3 /* otvgpos.c */ |
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4 /* */ |
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5 /* OpenType GPOS table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2002, 2004, 2005, 2006, 2007, 2008 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 #include "otvgpos.h" |
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22 |
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23 |
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24 /*************************************************************************/ |
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25 /* */ |
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26 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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27 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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28 /* messages during execution. */ |
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29 /* */ |
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30 #undef FT_COMPONENT |
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31 #define FT_COMPONENT trace_otvgpos |
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32 |
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33 |
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34 static void |
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35 otv_Anchor_validate( FT_Bytes table, |
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36 OTV_Validator valid ); |
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37 |
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38 static void |
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39 otv_MarkArray_validate( FT_Bytes table, |
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40 OTV_Validator valid ); |
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41 |
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42 |
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43 /*************************************************************************/ |
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44 /*************************************************************************/ |
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45 /***** *****/ |
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46 /***** UTILITY FUNCTIONS *****/ |
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47 /***** *****/ |
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48 /*************************************************************************/ |
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49 /*************************************************************************/ |
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50 |
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51 #define BaseArrayFunc otv_x_sxy |
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52 #define LigatureAttachFunc otv_x_sxy |
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53 #define Mark2ArrayFunc otv_x_sxy |
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54 |
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55 /* uses valid->extra1 (counter) */ |
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56 /* uses valid->extra2 (boolean to handle NULL anchor field) */ |
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57 |
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58 static void |
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59 otv_x_sxy( FT_Bytes table, |
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60 OTV_Validator valid ) |
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61 { |
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62 FT_Bytes p = table; |
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63 FT_UInt Count, count1, table_size; |
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64 |
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65 |
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66 OTV_ENTER; |
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67 |
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68 OTV_LIMIT_CHECK( 2 ); |
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69 |
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70 Count = FT_NEXT_USHORT( p ); |
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71 |
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72 OTV_TRACE(( " (Count = %d)\n", Count )); |
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73 |
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74 OTV_LIMIT_CHECK( Count * valid->extra1 * 2 ); |
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75 |
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76 table_size = Count * valid->extra1 * 2 + 2; |
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77 |
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78 for ( ; Count > 0; Count-- ) |
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79 for ( count1 = valid->extra1; count1 > 0; count1-- ) |
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80 { |
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81 OTV_OPTIONAL_TABLE( anchor_offset ); |
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82 |
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83 |
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84 OTV_OPTIONAL_OFFSET( anchor_offset ); |
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85 |
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86 if ( valid->extra2 ) |
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87 { |
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88 OTV_SIZE_CHECK( anchor_offset ); |
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89 if ( anchor_offset ) |
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90 otv_Anchor_validate( table + anchor_offset, valid ); |
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91 } |
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92 else |
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93 otv_Anchor_validate( table + anchor_offset, valid ); |
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94 } |
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95 |
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96 OTV_EXIT; |
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97 } |
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98 |
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99 |
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100 #define MarkBasePosFormat1Func otv_u_O_O_u_O_O |
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101 #define MarkLigPosFormat1Func otv_u_O_O_u_O_O |
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102 #define MarkMarkPosFormat1Func otv_u_O_O_u_O_O |
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103 |
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104 /* sets valid->extra1 (class count) */ |
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105 |
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106 static void |
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107 otv_u_O_O_u_O_O( FT_Bytes table, |
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108 OTV_Validator valid ) |
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109 { |
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110 FT_Bytes p = table; |
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111 FT_UInt Coverage1, Coverage2, ClassCount; |
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112 FT_UInt Array1, Array2; |
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113 OTV_Validate_Func func; |
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114 |
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115 |
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116 OTV_ENTER; |
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117 |
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118 p += 2; /* skip PosFormat */ |
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119 |
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120 OTV_LIMIT_CHECK( 10 ); |
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121 Coverage1 = FT_NEXT_USHORT( p ); |
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122 Coverage2 = FT_NEXT_USHORT( p ); |
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123 ClassCount = FT_NEXT_USHORT( p ); |
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124 Array1 = FT_NEXT_USHORT( p ); |
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125 Array2 = FT_NEXT_USHORT( p ); |
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126 |
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127 otv_Coverage_validate( table + Coverage1, valid, -1 ); |
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128 otv_Coverage_validate( table + Coverage2, valid, -1 ); |
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129 |
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130 otv_MarkArray_validate( table + Array1, valid ); |
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131 |
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132 valid->nesting_level++; |
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133 func = valid->func[valid->nesting_level]; |
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134 valid->extra1 = ClassCount; |
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135 |
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136 func( table + Array2, valid ); |
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137 |
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138 valid->nesting_level--; |
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139 |
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140 OTV_EXIT; |
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141 } |
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142 |
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143 |
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144 /*************************************************************************/ |
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145 /*************************************************************************/ |
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146 /***** *****/ |
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147 /***** VALUE RECORDS *****/ |
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148 /***** *****/ |
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149 /*************************************************************************/ |
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150 /*************************************************************************/ |
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151 |
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152 static FT_UInt |
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153 otv_value_length( FT_UInt format ) |
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154 { |
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155 FT_UInt count; |
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156 |
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157 |
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158 count = ( ( format & 0xAA ) >> 1 ) + ( format & 0x55 ); |
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159 count = ( ( count & 0xCC ) >> 2 ) + ( count & 0x33 ); |
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160 count = ( ( count & 0xF0 ) >> 4 ) + ( count & 0x0F ); |
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161 |
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162 return count * 2; |
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163 } |
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164 |
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165 |
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166 /* uses valid->extra3 (pointer to base table) */ |
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167 |
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168 static void |
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169 otv_ValueRecord_validate( FT_Bytes table, |
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170 FT_UInt format, |
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171 OTV_Validator valid ) |
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172 { |
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173 FT_Bytes p = table; |
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174 FT_UInt count; |
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175 |
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176 #ifdef FT_DEBUG_LEVEL_TRACE |
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177 FT_Int loop; |
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178 FT_ULong res = 0; |
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179 |
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180 |
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181 OTV_NAME_ENTER( "ValueRecord" ); |
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182 |
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183 /* display `format' in dual representation */ |
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184 for ( loop = 7; loop >= 0; loop-- ) |
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185 { |
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186 res <<= 4; |
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187 res += ( format >> loop ) & 1; |
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188 } |
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189 |
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190 OTV_TRACE(( " (format 0b%08lx)\n", res )); |
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191 #endif |
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192 |
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193 if ( format >= 0x100 ) |
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194 FT_INVALID_FORMAT; |
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195 |
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196 for ( count = 4; count > 0; count-- ) |
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197 { |
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198 if ( format & 1 ) |
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199 { |
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200 /* XPlacement, YPlacement, XAdvance, YAdvance */ |
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201 OTV_LIMIT_CHECK( 2 ); |
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202 p += 2; |
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203 } |
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204 |
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205 format >>= 1; |
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206 } |
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207 |
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208 for ( count = 4; count > 0; count-- ) |
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209 { |
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210 if ( format & 1 ) |
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211 { |
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212 FT_PtrDist table_size; |
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213 |
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214 OTV_OPTIONAL_TABLE( device ); |
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215 |
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216 |
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217 /* XPlaDevice, YPlaDevice, XAdvDevice, YAdvDevice */ |
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218 OTV_LIMIT_CHECK( 2 ); |
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219 OTV_OPTIONAL_OFFSET( device ); |
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220 |
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221 /* XXX: this value is usually too small, especially if the current */ |
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222 /* ValueRecord is part of an array -- getting the correct table */ |
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223 /* size is probably not worth the trouble */ |
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224 |
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225 table_size = p - valid->extra3; |
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226 |
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227 OTV_SIZE_CHECK( device ); |
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228 if ( device ) |
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229 otv_Device_validate( valid->extra3 + device, valid ); |
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230 } |
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231 format >>= 1; |
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232 } |
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233 |
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234 OTV_EXIT; |
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235 } |
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236 |
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237 |
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238 /*************************************************************************/ |
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239 /*************************************************************************/ |
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240 /***** *****/ |
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241 /***** ANCHORS *****/ |
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242 /***** *****/ |
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243 /*************************************************************************/ |
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244 /*************************************************************************/ |
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245 |
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246 static void |
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247 otv_Anchor_validate( FT_Bytes table, |
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248 OTV_Validator valid ) |
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249 { |
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250 FT_Bytes p = table; |
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251 FT_UInt AnchorFormat; |
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252 |
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253 |
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254 OTV_NAME_ENTER( "Anchor"); |
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255 |
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256 OTV_LIMIT_CHECK( 6 ); |
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257 AnchorFormat = FT_NEXT_USHORT( p ); |
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258 |
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259 OTV_TRACE(( " (format %d)\n", AnchorFormat )); |
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260 |
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261 p += 4; /* skip XCoordinate and YCoordinate */ |
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262 |
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263 switch ( AnchorFormat ) |
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264 { |
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265 case 1: |
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266 break; |
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267 |
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268 case 2: |
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269 OTV_LIMIT_CHECK( 2 ); /* AnchorPoint */ |
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270 break; |
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271 |
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272 case 3: |
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273 { |
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274 FT_UInt table_size; |
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275 |
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276 OTV_OPTIONAL_TABLE( XDeviceTable ); |
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277 OTV_OPTIONAL_TABLE( YDeviceTable ); |
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278 |
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279 |
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280 OTV_LIMIT_CHECK( 4 ); |
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281 OTV_OPTIONAL_OFFSET( XDeviceTable ); |
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282 OTV_OPTIONAL_OFFSET( YDeviceTable ); |
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283 |
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284 table_size = 6 + 4; |
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285 |
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286 OTV_SIZE_CHECK( XDeviceTable ); |
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287 if ( XDeviceTable ) |
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288 otv_Device_validate( table + XDeviceTable, valid ); |
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289 |
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290 OTV_SIZE_CHECK( YDeviceTable ); |
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291 if ( YDeviceTable ) |
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292 otv_Device_validate( table + YDeviceTable, valid ); |
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293 } |
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294 break; |
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295 |
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296 default: |
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297 FT_INVALID_FORMAT; |
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298 } |
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299 |
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300 OTV_EXIT; |
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301 } |
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302 |
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303 |
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304 /*************************************************************************/ |
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305 /*************************************************************************/ |
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306 /***** *****/ |
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307 /***** MARK ARRAYS *****/ |
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308 /***** *****/ |
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309 /*************************************************************************/ |
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310 /*************************************************************************/ |
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311 |
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312 static void |
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313 otv_MarkArray_validate( FT_Bytes table, |
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314 OTV_Validator valid ) |
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315 { |
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316 FT_Bytes p = table; |
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317 FT_UInt MarkCount; |
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318 |
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319 |
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320 OTV_NAME_ENTER( "MarkArray" ); |
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321 |
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322 OTV_LIMIT_CHECK( 2 ); |
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323 MarkCount = FT_NEXT_USHORT( p ); |
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324 |
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325 OTV_TRACE(( " (MarkCount = %d)\n", MarkCount )); |
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326 |
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327 OTV_LIMIT_CHECK( MarkCount * 4 ); |
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328 |
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329 /* MarkRecord */ |
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330 for ( ; MarkCount > 0; MarkCount-- ) |
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331 { |
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332 p += 2; /* skip Class */ |
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333 /* MarkAnchor */ |
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334 otv_Anchor_validate( table + FT_NEXT_USHORT( p ), valid ); |
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335 } |
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336 |
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337 OTV_EXIT; |
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338 } |
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339 |
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340 |
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341 /*************************************************************************/ |
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342 /*************************************************************************/ |
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343 /***** *****/ |
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344 /***** GPOS LOOKUP TYPE 1 *****/ |
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345 /***** *****/ |
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346 /*************************************************************************/ |
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347 /*************************************************************************/ |
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348 |
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349 /* sets valid->extra3 (pointer to base table) */ |
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350 |
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351 static void |
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352 otv_SinglePos_validate( FT_Bytes table, |
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353 OTV_Validator valid ) |
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354 { |
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355 FT_Bytes p = table; |
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356 FT_UInt PosFormat; |
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357 |
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358 |
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359 OTV_NAME_ENTER( "SinglePos" ); |
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360 |
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361 OTV_LIMIT_CHECK( 2 ); |
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362 PosFormat = FT_NEXT_USHORT( p ); |
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363 |
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364 OTV_TRACE(( " (format %d)\n", PosFormat )); |
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365 |
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366 valid->extra3 = table; |
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367 |
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368 switch ( PosFormat ) |
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369 { |
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370 case 1: /* SinglePosFormat1 */ |
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371 { |
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372 FT_UInt Coverage, ValueFormat; |
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373 |
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374 |
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375 OTV_LIMIT_CHECK( 4 ); |
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376 Coverage = FT_NEXT_USHORT( p ); |
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377 ValueFormat = FT_NEXT_USHORT( p ); |
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378 |
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379 otv_Coverage_validate( table + Coverage, valid, -1 ); |
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380 otv_ValueRecord_validate( p, ValueFormat, valid ); /* Value */ |
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381 } |
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382 break; |
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383 |
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384 case 2: /* SinglePosFormat2 */ |
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385 { |
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386 FT_UInt Coverage, ValueFormat, ValueCount, len_value; |
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387 |
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388 |
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389 OTV_LIMIT_CHECK( 6 ); |
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390 Coverage = FT_NEXT_USHORT( p ); |
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391 ValueFormat = FT_NEXT_USHORT( p ); |
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392 ValueCount = FT_NEXT_USHORT( p ); |
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393 |
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394 OTV_TRACE(( " (ValueCount = %d)\n", ValueCount )); |
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395 |
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396 len_value = otv_value_length( ValueFormat ); |
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397 |
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398 otv_Coverage_validate( table + Coverage, valid, ValueCount ); |
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399 |
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400 OTV_LIMIT_CHECK( ValueCount * len_value ); |
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401 |
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402 /* Value */ |
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403 for ( ; ValueCount > 0; ValueCount-- ) |
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404 { |
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405 otv_ValueRecord_validate( p, ValueFormat, valid ); |
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406 p += len_value; |
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407 } |
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408 } |
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409 break; |
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410 |
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411 default: |
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412 FT_INVALID_FORMAT; |
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413 } |
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414 |
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415 OTV_EXIT; |
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416 } |
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417 |
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418 |
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419 /*************************************************************************/ |
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420 /*************************************************************************/ |
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421 /***** *****/ |
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422 /***** GPOS LOOKUP TYPE 2 *****/ |
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423 /***** *****/ |
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424 /*************************************************************************/ |
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425 /*************************************************************************/ |
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426 |
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427 static void |
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428 otv_PairSet_validate( FT_Bytes table, |
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429 FT_UInt format1, |
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430 FT_UInt format2, |
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431 OTV_Validator valid ) |
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432 { |
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433 FT_Bytes p = table; |
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434 FT_UInt value_len1, value_len2, PairValueCount; |
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435 |
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436 |
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437 OTV_NAME_ENTER( "PairSet" ); |
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438 |
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439 OTV_LIMIT_CHECK( 2 ); |
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440 PairValueCount = FT_NEXT_USHORT( p ); |
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441 |
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442 OTV_TRACE(( " (PairValueCount = %d)\n", PairValueCount )); |
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443 |
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444 value_len1 = otv_value_length( format1 ); |
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445 value_len2 = otv_value_length( format2 ); |
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446 |
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447 OTV_LIMIT_CHECK( PairValueCount * ( value_len1 + value_len2 + 2 ) ); |
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448 |
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449 /* PairValueRecord */ |
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450 for ( ; PairValueCount > 0; PairValueCount-- ) |
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451 { |
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452 p += 2; /* skip SecondGlyph */ |
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453 |
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454 if ( format1 ) |
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455 otv_ValueRecord_validate( p, format1, valid ); /* Value1 */ |
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456 p += value_len1; |
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457 |
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458 if ( format2 ) |
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459 otv_ValueRecord_validate( p, format2, valid ); /* Value2 */ |
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460 p += value_len2; |
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461 } |
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462 |
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463 OTV_EXIT; |
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464 } |
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465 |
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466 |
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467 /* sets valid->extra3 (pointer to base table) */ |
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468 |
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469 static void |
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470 otv_PairPos_validate( FT_Bytes table, |
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471 OTV_Validator valid ) |
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472 { |
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473 FT_Bytes p = table; |
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474 FT_UInt PosFormat; |
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475 |
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476 |
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477 OTV_NAME_ENTER( "PairPos" ); |
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478 |
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479 OTV_LIMIT_CHECK( 2 ); |
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480 PosFormat = FT_NEXT_USHORT( p ); |
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481 |
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482 OTV_TRACE(( " (format %d)\n", PosFormat )); |
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483 |
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484 valid->extra3 = table; |
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485 |
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486 switch ( PosFormat ) |
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487 { |
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488 case 1: /* PairPosFormat1 */ |
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489 { |
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490 FT_UInt Coverage, ValueFormat1, ValueFormat2, PairSetCount; |
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491 |
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492 |
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493 OTV_LIMIT_CHECK( 8 ); |
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494 Coverage = FT_NEXT_USHORT( p ); |
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495 ValueFormat1 = FT_NEXT_USHORT( p ); |
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496 ValueFormat2 = FT_NEXT_USHORT( p ); |
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497 PairSetCount = FT_NEXT_USHORT( p ); |
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498 |
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499 OTV_TRACE(( " (PairSetCount = %d)\n", PairSetCount )); |
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500 |
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501 otv_Coverage_validate( table + Coverage, valid, -1 ); |
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502 |
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503 OTV_LIMIT_CHECK( PairSetCount * 2 ); |
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504 |
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505 /* PairSetOffset */ |
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506 for ( ; PairSetCount > 0; PairSetCount-- ) |
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507 otv_PairSet_validate( table + FT_NEXT_USHORT( p ), |
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508 ValueFormat1, ValueFormat2, valid ); |
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509 } |
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510 break; |
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511 |
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512 case 2: /* PairPosFormat2 */ |
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513 { |
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514 FT_UInt Coverage, ValueFormat1, ValueFormat2, ClassDef1, ClassDef2; |
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515 FT_UInt ClassCount1, ClassCount2, len_value1, len_value2, count; |
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516 |
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517 |
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518 OTV_LIMIT_CHECK( 14 ); |
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519 Coverage = FT_NEXT_USHORT( p ); |
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520 ValueFormat1 = FT_NEXT_USHORT( p ); |
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521 ValueFormat2 = FT_NEXT_USHORT( p ); |
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522 ClassDef1 = FT_NEXT_USHORT( p ); |
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523 ClassDef2 = FT_NEXT_USHORT( p ); |
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524 ClassCount1 = FT_NEXT_USHORT( p ); |
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525 ClassCount2 = FT_NEXT_USHORT( p ); |
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526 |
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527 OTV_TRACE(( " (ClassCount1 = %d)\n", ClassCount1 )); |
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528 OTV_TRACE(( " (ClassCount2 = %d)\n", ClassCount2 )); |
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529 |
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530 len_value1 = otv_value_length( ValueFormat1 ); |
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531 len_value2 = otv_value_length( ValueFormat2 ); |
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532 |
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533 otv_Coverage_validate( table + Coverage, valid, -1 ); |
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534 otv_ClassDef_validate( table + ClassDef1, valid ); |
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535 otv_ClassDef_validate( table + ClassDef2, valid ); |
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536 |
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537 OTV_LIMIT_CHECK( ClassCount1 * ClassCount2 * |
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538 ( len_value1 + len_value2 ) ); |
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539 |
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540 /* Class1Record */ |
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541 for ( ; ClassCount1 > 0; ClassCount1-- ) |
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542 { |
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543 /* Class2Record */ |
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544 for ( count = ClassCount2; count > 0; count-- ) |
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545 { |
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546 if ( ValueFormat1 ) |
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547 /* Value1 */ |
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548 otv_ValueRecord_validate( p, ValueFormat1, valid ); |
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549 p += len_value1; |
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550 |
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551 if ( ValueFormat2 ) |
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552 /* Value2 */ |
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553 otv_ValueRecord_validate( p, ValueFormat2, valid ); |
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554 p += len_value2; |
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555 } |
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556 } |
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557 } |
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558 break; |
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559 |
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560 default: |
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561 FT_INVALID_FORMAT; |
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562 } |
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563 |
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564 OTV_EXIT; |
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565 } |
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566 |
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567 |
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568 /*************************************************************************/ |
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569 /*************************************************************************/ |
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570 /***** *****/ |
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571 /***** GPOS LOOKUP TYPE 3 *****/ |
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572 /***** *****/ |
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573 /*************************************************************************/ |
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574 /*************************************************************************/ |
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575 |
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576 static void |
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577 otv_CursivePos_validate( FT_Bytes table, |
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578 OTV_Validator valid ) |
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579 { |
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580 FT_Bytes p = table; |
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581 FT_UInt PosFormat; |
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582 |
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583 |
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584 OTV_NAME_ENTER( "CursivePos" ); |
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585 |
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586 OTV_LIMIT_CHECK( 2 ); |
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587 PosFormat = FT_NEXT_USHORT( p ); |
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588 |
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589 OTV_TRACE(( " (format %d)\n", PosFormat )); |
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590 |
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591 switch ( PosFormat ) |
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592 { |
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593 case 1: /* CursivePosFormat1 */ |
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594 { |
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595 FT_UInt table_size; |
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596 FT_UInt Coverage, EntryExitCount; |
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597 |
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598 OTV_OPTIONAL_TABLE( EntryAnchor ); |
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599 OTV_OPTIONAL_TABLE( ExitAnchor ); |
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600 |
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601 |
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602 OTV_LIMIT_CHECK( 4 ); |
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603 Coverage = FT_NEXT_USHORT( p ); |
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604 EntryExitCount = FT_NEXT_USHORT( p ); |
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605 |
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606 OTV_TRACE(( " (EntryExitCount = %d)\n", EntryExitCount )); |
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607 |
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608 otv_Coverage_validate( table + Coverage, valid, EntryExitCount ); |
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609 |
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610 OTV_LIMIT_CHECK( EntryExitCount * 4 ); |
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611 |
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612 table_size = EntryExitCount * 4 + 4; |
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613 |
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614 /* EntryExitRecord */ |
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615 for ( ; EntryExitCount > 0; EntryExitCount-- ) |
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616 { |
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617 OTV_OPTIONAL_OFFSET( EntryAnchor ); |
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618 OTV_OPTIONAL_OFFSET( ExitAnchor ); |
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619 |
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620 OTV_SIZE_CHECK( EntryAnchor ); |
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621 if ( EntryAnchor ) |
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622 otv_Anchor_validate( table + EntryAnchor, valid ); |
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623 |
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624 OTV_SIZE_CHECK( ExitAnchor ); |
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625 if ( ExitAnchor ) |
|
626 otv_Anchor_validate( table + ExitAnchor, valid ); |
|
627 } |
|
628 } |
|
629 break; |
|
630 |
|
631 default: |
|
632 FT_INVALID_FORMAT; |
|
633 } |
|
634 |
|
635 OTV_EXIT; |
|
636 } |
|
637 |
|
638 |
|
639 /*************************************************************************/ |
|
640 /*************************************************************************/ |
|
641 /***** *****/ |
|
642 /***** GPOS LOOKUP TYPE 4 *****/ |
|
643 /***** *****/ |
|
644 /*************************************************************************/ |
|
645 /*************************************************************************/ |
|
646 |
|
647 /* UNDOCUMENTED (in OpenType 1.5): */ |
|
648 /* BaseRecord tables can contain NULL pointers. */ |
|
649 |
|
650 /* sets valid->extra2 (1) */ |
|
651 |
|
652 static void |
|
653 otv_MarkBasePos_validate( FT_Bytes table, |
|
654 OTV_Validator valid ) |
|
655 { |
|
656 FT_Bytes p = table; |
|
657 FT_UInt PosFormat; |
|
658 |
|
659 |
|
660 OTV_NAME_ENTER( "MarkBasePos" ); |
|
661 |
|
662 OTV_LIMIT_CHECK( 2 ); |
|
663 PosFormat = FT_NEXT_USHORT( p ); |
|
664 |
|
665 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
666 |
|
667 switch ( PosFormat ) |
|
668 { |
|
669 case 1: |
|
670 valid->extra2 = 1; |
|
671 OTV_NEST2( MarkBasePosFormat1, BaseArray ); |
|
672 OTV_RUN( table, valid ); |
|
673 break; |
|
674 |
|
675 default: |
|
676 FT_INVALID_FORMAT; |
|
677 } |
|
678 |
|
679 OTV_EXIT; |
|
680 } |
|
681 |
|
682 |
|
683 /*************************************************************************/ |
|
684 /*************************************************************************/ |
|
685 /***** *****/ |
|
686 /***** GPOS LOOKUP TYPE 5 *****/ |
|
687 /***** *****/ |
|
688 /*************************************************************************/ |
|
689 /*************************************************************************/ |
|
690 |
|
691 /* sets valid->extra2 (1) */ |
|
692 |
|
693 static void |
|
694 otv_MarkLigPos_validate( FT_Bytes table, |
|
695 OTV_Validator valid ) |
|
696 { |
|
697 FT_Bytes p = table; |
|
698 FT_UInt PosFormat; |
|
699 |
|
700 |
|
701 OTV_NAME_ENTER( "MarkLigPos" ); |
|
702 |
|
703 OTV_LIMIT_CHECK( 2 ); |
|
704 PosFormat = FT_NEXT_USHORT( p ); |
|
705 |
|
706 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
707 |
|
708 switch ( PosFormat ) |
|
709 { |
|
710 case 1: |
|
711 valid->extra2 = 1; |
|
712 OTV_NEST3( MarkLigPosFormat1, LigatureArray, LigatureAttach ); |
|
713 OTV_RUN( table, valid ); |
|
714 break; |
|
715 |
|
716 default: |
|
717 FT_INVALID_FORMAT; |
|
718 } |
|
719 |
|
720 OTV_EXIT; |
|
721 } |
|
722 |
|
723 |
|
724 /*************************************************************************/ |
|
725 /*************************************************************************/ |
|
726 /***** *****/ |
|
727 /***** GPOS LOOKUP TYPE 6 *****/ |
|
728 /***** *****/ |
|
729 /*************************************************************************/ |
|
730 /*************************************************************************/ |
|
731 |
|
732 /* sets valid->extra2 (0) */ |
|
733 |
|
734 static void |
|
735 otv_MarkMarkPos_validate( FT_Bytes table, |
|
736 OTV_Validator valid ) |
|
737 { |
|
738 FT_Bytes p = table; |
|
739 FT_UInt PosFormat; |
|
740 |
|
741 |
|
742 OTV_NAME_ENTER( "MarkMarkPos" ); |
|
743 |
|
744 OTV_LIMIT_CHECK( 2 ); |
|
745 PosFormat = FT_NEXT_USHORT( p ); |
|
746 |
|
747 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
748 |
|
749 switch ( PosFormat ) |
|
750 { |
|
751 case 1: |
|
752 valid->extra2 = 0; |
|
753 OTV_NEST2( MarkMarkPosFormat1, Mark2Array ); |
|
754 OTV_RUN( table, valid ); |
|
755 break; |
|
756 |
|
757 default: |
|
758 FT_INVALID_FORMAT; |
|
759 } |
|
760 |
|
761 OTV_EXIT; |
|
762 } |
|
763 |
|
764 |
|
765 /*************************************************************************/ |
|
766 /*************************************************************************/ |
|
767 /***** *****/ |
|
768 /***** GPOS LOOKUP TYPE 7 *****/ |
|
769 /***** *****/ |
|
770 /*************************************************************************/ |
|
771 /*************************************************************************/ |
|
772 |
|
773 /* sets valid->extra1 (lookup count) */ |
|
774 |
|
775 static void |
|
776 otv_ContextPos_validate( FT_Bytes table, |
|
777 OTV_Validator valid ) |
|
778 { |
|
779 FT_Bytes p = table; |
|
780 FT_UInt PosFormat; |
|
781 |
|
782 |
|
783 OTV_NAME_ENTER( "ContextPos" ); |
|
784 |
|
785 OTV_LIMIT_CHECK( 2 ); |
|
786 PosFormat = FT_NEXT_USHORT( p ); |
|
787 |
|
788 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
789 |
|
790 switch ( PosFormat ) |
|
791 { |
|
792 case 1: |
|
793 /* no need to check glyph indices/classes used as input for these */ |
|
794 /* context rules since even invalid glyph indices/classes return */ |
|
795 /* meaningful results */ |
|
796 |
|
797 valid->extra1 = valid->lookup_count; |
|
798 OTV_NEST3( ContextPosFormat1, PosRuleSet, PosRule ); |
|
799 OTV_RUN( table, valid ); |
|
800 break; |
|
801 |
|
802 case 2: |
|
803 /* no need to check glyph indices/classes used as input for these */ |
|
804 /* context rules since even invalid glyph indices/classes return */ |
|
805 /* meaningful results */ |
|
806 |
|
807 OTV_NEST3( ContextPosFormat2, PosClassSet, PosClassRule ); |
|
808 OTV_RUN( table, valid ); |
|
809 break; |
|
810 |
|
811 case 3: |
|
812 OTV_NEST1( ContextPosFormat3 ); |
|
813 OTV_RUN( table, valid ); |
|
814 break; |
|
815 |
|
816 default: |
|
817 FT_INVALID_FORMAT; |
|
818 } |
|
819 |
|
820 OTV_EXIT; |
|
821 } |
|
822 |
|
823 |
|
824 /*************************************************************************/ |
|
825 /*************************************************************************/ |
|
826 /***** *****/ |
|
827 /***** GPOS LOOKUP TYPE 8 *****/ |
|
828 /***** *****/ |
|
829 /*************************************************************************/ |
|
830 /*************************************************************************/ |
|
831 |
|
832 /* sets valid->extra1 (lookup count) */ |
|
833 |
|
834 static void |
|
835 otv_ChainContextPos_validate( FT_Bytes table, |
|
836 OTV_Validator valid ) |
|
837 { |
|
838 FT_Bytes p = table; |
|
839 FT_UInt PosFormat; |
|
840 |
|
841 |
|
842 OTV_NAME_ENTER( "ChainContextPos" ); |
|
843 |
|
844 OTV_LIMIT_CHECK( 2 ); |
|
845 PosFormat = FT_NEXT_USHORT( p ); |
|
846 |
|
847 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
848 |
|
849 switch ( PosFormat ) |
|
850 { |
|
851 case 1: |
|
852 /* no need to check glyph indices/classes used as input for these */ |
|
853 /* context rules since even invalid glyph indices/classes return */ |
|
854 /* meaningful results */ |
|
855 |
|
856 valid->extra1 = valid->lookup_count; |
|
857 OTV_NEST3( ChainContextPosFormat1, |
|
858 ChainPosRuleSet, ChainPosRule ); |
|
859 OTV_RUN( table, valid ); |
|
860 break; |
|
861 |
|
862 case 2: |
|
863 /* no need to check glyph indices/classes used as input for these */ |
|
864 /* context rules since even invalid glyph indices/classes return */ |
|
865 /* meaningful results */ |
|
866 |
|
867 OTV_NEST3( ChainContextPosFormat2, |
|
868 ChainPosClassSet, ChainPosClassRule ); |
|
869 OTV_RUN( table, valid ); |
|
870 break; |
|
871 |
|
872 case 3: |
|
873 OTV_NEST1( ChainContextPosFormat3 ); |
|
874 OTV_RUN( table, valid ); |
|
875 break; |
|
876 |
|
877 default: |
|
878 FT_INVALID_FORMAT; |
|
879 } |
|
880 |
|
881 OTV_EXIT; |
|
882 } |
|
883 |
|
884 |
|
885 /*************************************************************************/ |
|
886 /*************************************************************************/ |
|
887 /***** *****/ |
|
888 /***** GPOS LOOKUP TYPE 9 *****/ |
|
889 /***** *****/ |
|
890 /*************************************************************************/ |
|
891 /*************************************************************************/ |
|
892 |
|
893 /* uses valid->type_funcs */ |
|
894 |
|
895 static void |
|
896 otv_ExtensionPos_validate( FT_Bytes table, |
|
897 OTV_Validator valid ) |
|
898 { |
|
899 FT_Bytes p = table; |
|
900 FT_UInt PosFormat; |
|
901 |
|
902 |
|
903 OTV_NAME_ENTER( "ExtensionPos" ); |
|
904 |
|
905 OTV_LIMIT_CHECK( 2 ); |
|
906 PosFormat = FT_NEXT_USHORT( p ); |
|
907 |
|
908 OTV_TRACE(( " (format %d)\n", PosFormat )); |
|
909 |
|
910 switch ( PosFormat ) |
|
911 { |
|
912 case 1: /* ExtensionPosFormat1 */ |
|
913 { |
|
914 FT_UInt ExtensionLookupType; |
|
915 FT_ULong ExtensionOffset; |
|
916 OTV_Validate_Func validate; |
|
917 |
|
918 |
|
919 OTV_LIMIT_CHECK( 6 ); |
|
920 ExtensionLookupType = FT_NEXT_USHORT( p ); |
|
921 ExtensionOffset = FT_NEXT_ULONG( p ); |
|
922 |
|
923 if ( ExtensionLookupType == 0 || ExtensionLookupType >= 9 ) |
|
924 FT_INVALID_DATA; |
|
925 |
|
926 validate = valid->type_funcs[ExtensionLookupType - 1]; |
|
927 validate( table + ExtensionOffset, valid ); |
|
928 } |
|
929 break; |
|
930 |
|
931 default: |
|
932 FT_INVALID_FORMAT; |
|
933 } |
|
934 |
|
935 OTV_EXIT; |
|
936 } |
|
937 |
|
938 |
|
939 static const OTV_Validate_Func otv_gpos_validate_funcs[9] = |
|
940 { |
|
941 otv_SinglePos_validate, |
|
942 otv_PairPos_validate, |
|
943 otv_CursivePos_validate, |
|
944 otv_MarkBasePos_validate, |
|
945 otv_MarkLigPos_validate, |
|
946 otv_MarkMarkPos_validate, |
|
947 otv_ContextPos_validate, |
|
948 otv_ChainContextPos_validate, |
|
949 otv_ExtensionPos_validate |
|
950 }; |
|
951 |
|
952 |
|
953 /* sets valid->type_count */ |
|
954 /* sets valid->type_funcs */ |
|
955 |
|
956 FT_LOCAL_DEF( void ) |
|
957 otv_GPOS_subtable_validate( FT_Bytes table, |
|
958 OTV_Validator valid ) |
|
959 { |
|
960 valid->type_count = 9; |
|
961 valid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs; |
|
962 |
|
963 otv_Lookup_validate( table, valid ); |
|
964 } |
|
965 |
|
966 |
|
967 /*************************************************************************/ |
|
968 /*************************************************************************/ |
|
969 /***** *****/ |
|
970 /***** GPOS TABLE *****/ |
|
971 /***** *****/ |
|
972 /*************************************************************************/ |
|
973 /*************************************************************************/ |
|
974 |
|
975 /* sets valid->glyph_count */ |
|
976 |
|
977 FT_LOCAL_DEF( void ) |
|
978 otv_GPOS_validate( FT_Bytes table, |
|
979 FT_UInt glyph_count, |
|
980 FT_Validator ftvalid ) |
|
981 { |
|
982 OTV_ValidatorRec validrec; |
|
983 OTV_Validator valid = &validrec; |
|
984 FT_Bytes p = table; |
|
985 FT_UInt ScriptList, FeatureList, LookupList; |
|
986 |
|
987 |
|
988 valid->root = ftvalid; |
|
989 |
|
990 FT_TRACE3(( "validating GPOS table\n" )); |
|
991 OTV_INIT; |
|
992 |
|
993 OTV_LIMIT_CHECK( 10 ); |
|
994 |
|
995 if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
|
996 FT_INVALID_FORMAT; |
|
997 |
|
998 ScriptList = FT_NEXT_USHORT( p ); |
|
999 FeatureList = FT_NEXT_USHORT( p ); |
|
1000 LookupList = FT_NEXT_USHORT( p ); |
|
1001 |
|
1002 valid->type_count = 9; |
|
1003 valid->type_funcs = (OTV_Validate_Func*)otv_gpos_validate_funcs; |
|
1004 valid->glyph_count = glyph_count; |
|
1005 |
|
1006 otv_LookupList_validate( table + LookupList, |
|
1007 valid ); |
|
1008 otv_FeatureList_validate( table + FeatureList, table + LookupList, |
|
1009 valid ); |
|
1010 otv_ScriptList_validate( table + ScriptList, table + FeatureList, |
|
1011 valid ); |
|
1012 |
|
1013 FT_TRACE4(( "\n" )); |
|
1014 } |
|
1015 |
|
1016 |
|
1017 /* END */ |
|