1 /***************************************************************************/ |
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2 /* */ |
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3 /* otvcommn.c */ |
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4 /* */ |
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5 /* OpenType common tables validation (body). */ |
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6 /* */ |
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7 /* Copyright 2004, 2005, 2006, 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 "otvcommn.h" |
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20 |
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21 |
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22 /*************************************************************************/ |
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23 /* */ |
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24 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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25 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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26 /* messages during execution. */ |
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27 /* */ |
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28 #undef FT_COMPONENT |
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29 #define FT_COMPONENT trace_otvcommon |
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30 |
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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 /***** COVERAGE TABLE *****/ |
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36 /***** *****/ |
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37 /*************************************************************************/ |
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38 /*************************************************************************/ |
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39 |
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40 FT_LOCAL_DEF( void ) |
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41 otv_Coverage_validate( FT_Bytes table, |
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42 OTV_Validator valid, |
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43 FT_Int expected_count ) |
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44 { |
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45 FT_Bytes p = table; |
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46 FT_UInt CoverageFormat; |
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47 FT_UInt total = 0; |
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48 |
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49 |
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50 OTV_NAME_ENTER( "Coverage" ); |
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51 |
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52 OTV_LIMIT_CHECK( 4 ); |
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53 CoverageFormat = FT_NEXT_USHORT( p ); |
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54 |
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55 OTV_TRACE(( " (format %d)\n", CoverageFormat )); |
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56 |
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57 switch ( CoverageFormat ) |
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58 { |
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59 case 1: /* CoverageFormat1 */ |
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60 { |
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61 FT_UInt GlyphCount; |
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62 FT_UInt i; |
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63 |
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64 |
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65 GlyphCount = FT_NEXT_USHORT( p ); |
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66 |
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67 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
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68 |
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69 OTV_LIMIT_CHECK( GlyphCount * 2 ); /* GlyphArray */ |
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70 |
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71 for ( i = 0; i < GlyphCount; ++i ) |
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72 { |
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73 FT_UInt gid; |
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74 |
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75 |
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76 gid = FT_NEXT_USHORT( p ); |
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77 if ( gid >= valid->glyph_count ) |
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78 FT_INVALID_GLYPH_ID; |
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79 } |
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80 |
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81 total = GlyphCount; |
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82 } |
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83 break; |
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84 |
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85 case 2: /* CoverageFormat2 */ |
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86 { |
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87 FT_UInt n, RangeCount; |
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88 FT_UInt Start, End, StartCoverageIndex, last = 0; |
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89 |
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90 |
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91 RangeCount = FT_NEXT_USHORT( p ); |
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92 |
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93 OTV_TRACE(( " (RangeCount = %d)\n", RangeCount )); |
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94 |
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95 OTV_LIMIT_CHECK( RangeCount * 6 ); |
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96 |
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97 /* RangeRecord */ |
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98 for ( n = 0; n < RangeCount; n++ ) |
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99 { |
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100 Start = FT_NEXT_USHORT( p ); |
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101 End = FT_NEXT_USHORT( p ); |
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102 StartCoverageIndex = FT_NEXT_USHORT( p ); |
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103 |
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104 if ( Start > End || StartCoverageIndex != total ) |
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105 FT_INVALID_DATA; |
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106 |
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107 if ( End >= valid->glyph_count ) |
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108 FT_INVALID_GLYPH_ID; |
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109 |
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110 if ( n > 0 && Start <= last ) |
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111 FT_INVALID_DATA; |
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112 |
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113 total += End - Start + 1; |
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114 last = End; |
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115 } |
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116 } |
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117 break; |
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118 |
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119 default: |
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120 FT_INVALID_FORMAT; |
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121 } |
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122 |
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123 /* Generally, a coverage table offset has an associated count field. */ |
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124 /* The number of glyphs in the table should match this field. If */ |
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125 /* there is no associated count, a value of -1 tells us not to check. */ |
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126 if ( expected_count != -1 && (FT_UInt)expected_count != total ) |
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127 FT_INVALID_DATA; |
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128 |
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129 OTV_EXIT; |
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130 } |
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131 |
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132 |
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133 FT_LOCAL_DEF( FT_UInt ) |
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134 otv_Coverage_get_first( FT_Bytes table ) |
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135 { |
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136 FT_Bytes p = table; |
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137 |
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138 |
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139 p += 4; /* skip CoverageFormat and Glyph/RangeCount */ |
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140 |
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141 return FT_NEXT_USHORT( p ); |
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142 } |
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143 |
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144 |
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145 FT_LOCAL_DEF( FT_UInt ) |
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146 otv_Coverage_get_last( FT_Bytes table ) |
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147 { |
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148 FT_Bytes p = table; |
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149 FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
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150 FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
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151 FT_UInt result = 0; |
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152 |
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153 |
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154 switch ( CoverageFormat ) |
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155 { |
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156 case 1: |
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157 p += ( count - 1 ) * 2; |
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158 result = FT_NEXT_USHORT( p ); |
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159 break; |
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160 |
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161 case 2: |
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162 p += ( count - 1 ) * 6 + 2; |
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163 result = FT_NEXT_USHORT( p ); |
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164 break; |
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165 |
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166 default: |
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167 ; |
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168 } |
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169 |
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170 return result; |
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171 } |
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172 |
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173 |
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174 FT_LOCAL_DEF( FT_UInt ) |
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175 otv_Coverage_get_count( FT_Bytes table ) |
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176 { |
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177 FT_Bytes p = table; |
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178 FT_UInt CoverageFormat = FT_NEXT_USHORT( p ); |
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179 FT_UInt count = FT_NEXT_USHORT( p ); /* Glyph/RangeCount */ |
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180 FT_UInt result = 0; |
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181 |
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182 |
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183 switch ( CoverageFormat ) |
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184 { |
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185 case 1: |
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186 return count; |
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187 |
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188 case 2: |
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189 { |
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190 FT_UInt Start, End; |
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191 |
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192 |
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193 for ( ; count > 0; count-- ) |
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194 { |
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195 Start = FT_NEXT_USHORT( p ); |
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196 End = FT_NEXT_USHORT( p ); |
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197 p += 2; /* skip StartCoverageIndex */ |
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198 |
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199 result += End - Start + 1; |
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200 } |
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201 } |
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202 break; |
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203 |
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204 default: |
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205 ; |
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206 } |
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207 |
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208 return result; |
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209 } |
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210 |
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211 |
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212 /*************************************************************************/ |
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213 /*************************************************************************/ |
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214 /***** *****/ |
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215 /***** CLASS DEFINITION TABLE *****/ |
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216 /***** *****/ |
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217 /*************************************************************************/ |
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218 /*************************************************************************/ |
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219 |
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220 FT_LOCAL_DEF( void ) |
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221 otv_ClassDef_validate( FT_Bytes table, |
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222 OTV_Validator valid ) |
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223 { |
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224 FT_Bytes p = table; |
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225 FT_UInt ClassFormat; |
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226 |
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227 |
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228 OTV_NAME_ENTER( "ClassDef" ); |
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229 |
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230 OTV_LIMIT_CHECK( 4 ); |
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231 ClassFormat = FT_NEXT_USHORT( p ); |
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232 |
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233 OTV_TRACE(( " (format %d)\n", ClassFormat )); |
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234 |
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235 switch ( ClassFormat ) |
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236 { |
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237 case 1: /* ClassDefFormat1 */ |
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238 { |
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239 FT_UInt StartGlyph; |
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240 FT_UInt GlyphCount; |
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241 |
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242 |
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243 OTV_LIMIT_CHECK( 4 ); |
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244 |
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245 StartGlyph = FT_NEXT_USHORT( p ); |
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246 GlyphCount = FT_NEXT_USHORT( p ); |
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247 |
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248 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
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249 |
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250 OTV_LIMIT_CHECK( GlyphCount * 2 ); /* ClassValueArray */ |
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251 |
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252 if ( StartGlyph + GlyphCount - 1 >= valid->glyph_count ) |
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253 FT_INVALID_GLYPH_ID; |
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254 } |
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255 break; |
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256 |
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257 case 2: /* ClassDefFormat2 */ |
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258 { |
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259 FT_UInt n, ClassRangeCount; |
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260 FT_UInt Start, End, last = 0; |
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261 |
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262 |
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263 ClassRangeCount = FT_NEXT_USHORT( p ); |
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264 |
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265 OTV_TRACE(( " (ClassRangeCount = %d)\n", ClassRangeCount )); |
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266 |
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267 OTV_LIMIT_CHECK( ClassRangeCount * 6 ); |
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268 |
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269 /* ClassRangeRecord */ |
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270 for ( n = 0; n < ClassRangeCount; n++ ) |
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271 { |
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272 Start = FT_NEXT_USHORT( p ); |
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273 End = FT_NEXT_USHORT( p ); |
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274 p += 2; /* skip Class */ |
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275 |
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276 if ( Start > End || ( n > 0 && Start <= last ) ) |
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277 FT_INVALID_DATA; |
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278 |
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279 if ( End >= valid->glyph_count ) |
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280 FT_INVALID_GLYPH_ID; |
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281 |
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282 last = End; |
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283 } |
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284 } |
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285 break; |
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286 |
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287 default: |
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288 FT_INVALID_FORMAT; |
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289 } |
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290 |
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291 /* no need to check glyph indices used as input to class definition */ |
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292 /* tables since even invalid glyph indices return a meaningful result */ |
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293 |
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294 OTV_EXIT; |
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295 } |
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296 |
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297 |
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298 /*************************************************************************/ |
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299 /*************************************************************************/ |
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300 /***** *****/ |
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301 /***** DEVICE TABLE *****/ |
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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 FT_LOCAL_DEF( void ) |
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307 otv_Device_validate( FT_Bytes table, |
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308 OTV_Validator valid ) |
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309 { |
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310 FT_Bytes p = table; |
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311 FT_UInt StartSize, EndSize, DeltaFormat, count; |
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312 |
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313 |
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314 OTV_NAME_ENTER( "Device" ); |
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315 |
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316 OTV_LIMIT_CHECK( 8 ); |
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317 StartSize = FT_NEXT_USHORT( p ); |
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318 EndSize = FT_NEXT_USHORT( p ); |
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319 DeltaFormat = FT_NEXT_USHORT( p ); |
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320 |
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321 if ( DeltaFormat < 1 || DeltaFormat > 3 ) |
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322 FT_INVALID_FORMAT; |
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323 |
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324 if ( EndSize < StartSize ) |
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325 FT_INVALID_DATA; |
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326 |
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327 count = EndSize - StartSize + 1; |
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328 OTV_LIMIT_CHECK( ( 1 << DeltaFormat ) * count / 8 ); /* DeltaValue */ |
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329 |
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330 OTV_EXIT; |
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331 } |
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332 |
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333 |
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334 /*************************************************************************/ |
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335 /*************************************************************************/ |
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336 /***** *****/ |
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337 /***** LOOKUPS *****/ |
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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 /* uses valid->type_count */ |
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343 /* uses valid->type_funcs */ |
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344 |
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345 FT_LOCAL_DEF( void ) |
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346 otv_Lookup_validate( FT_Bytes table, |
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347 OTV_Validator valid ) |
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348 { |
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349 FT_Bytes p = table; |
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350 FT_UInt LookupType, SubTableCount; |
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351 OTV_Validate_Func validate; |
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352 |
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353 |
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354 OTV_NAME_ENTER( "Lookup" ); |
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355 |
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356 OTV_LIMIT_CHECK( 6 ); |
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357 LookupType = FT_NEXT_USHORT( p ); |
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358 p += 2; /* skip LookupFlag */ |
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359 SubTableCount = FT_NEXT_USHORT( p ); |
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360 |
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361 OTV_TRACE(( " (type %d)\n", LookupType )); |
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362 |
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363 if ( LookupType == 0 || LookupType > valid->type_count ) |
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364 FT_INVALID_DATA; |
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365 |
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366 validate = valid->type_funcs[LookupType - 1]; |
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367 |
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368 OTV_TRACE(( " (SubTableCount = %d)\n", SubTableCount )); |
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369 |
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370 OTV_LIMIT_CHECK( SubTableCount * 2 ); |
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371 |
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372 /* SubTable */ |
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373 for ( ; SubTableCount > 0; SubTableCount-- ) |
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374 validate( table + FT_NEXT_USHORT( p ), valid ); |
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375 |
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376 OTV_EXIT; |
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377 } |
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378 |
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379 |
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380 /* uses valid->lookup_count */ |
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381 |
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382 FT_LOCAL_DEF( void ) |
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383 otv_LookupList_validate( FT_Bytes table, |
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384 OTV_Validator valid ) |
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385 { |
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386 FT_Bytes p = table; |
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387 FT_UInt LookupCount; |
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388 |
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389 |
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390 OTV_NAME_ENTER( "LookupList" ); |
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391 |
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392 OTV_LIMIT_CHECK( 2 ); |
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393 LookupCount = FT_NEXT_USHORT( p ); |
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394 |
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395 OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
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396 |
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397 OTV_LIMIT_CHECK( LookupCount * 2 ); |
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398 |
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399 valid->lookup_count = LookupCount; |
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400 |
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401 /* Lookup */ |
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402 for ( ; LookupCount > 0; LookupCount-- ) |
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403 otv_Lookup_validate( table + FT_NEXT_USHORT( p ), valid ); |
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404 |
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405 OTV_EXIT; |
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406 } |
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407 |
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408 |
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409 static FT_UInt |
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410 otv_LookupList_get_count( FT_Bytes table ) |
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411 { |
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412 return FT_NEXT_USHORT( table ); |
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413 } |
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414 |
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415 |
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416 /*************************************************************************/ |
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417 /*************************************************************************/ |
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418 /***** *****/ |
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419 /***** FEATURES *****/ |
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420 /***** *****/ |
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421 /*************************************************************************/ |
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422 /*************************************************************************/ |
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423 |
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424 /* uses valid->lookup_count */ |
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425 |
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426 FT_LOCAL_DEF( void ) |
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427 otv_Feature_validate( FT_Bytes table, |
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428 OTV_Validator valid ) |
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429 { |
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430 FT_Bytes p = table; |
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431 FT_UInt LookupCount; |
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432 |
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433 |
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434 OTV_NAME_ENTER( "Feature" ); |
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435 |
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436 OTV_LIMIT_CHECK( 4 ); |
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437 p += 2; /* skip FeatureParams (unused) */ |
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438 LookupCount = FT_NEXT_USHORT( p ); |
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439 |
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440 OTV_TRACE(( " (LookupCount = %d)\n", LookupCount )); |
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441 |
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442 OTV_LIMIT_CHECK( LookupCount * 2 ); |
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443 |
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444 /* LookupListIndex */ |
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445 for ( ; LookupCount > 0; LookupCount-- ) |
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446 if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
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447 FT_INVALID_DATA; |
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448 |
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449 OTV_EXIT; |
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450 } |
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451 |
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452 |
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453 static FT_UInt |
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454 otv_Feature_get_count( FT_Bytes table ) |
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455 { |
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456 return FT_NEXT_USHORT( table ); |
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457 } |
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458 |
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459 |
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460 /* sets valid->lookup_count */ |
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461 |
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462 FT_LOCAL_DEF( void ) |
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463 otv_FeatureList_validate( FT_Bytes table, |
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464 FT_Bytes lookups, |
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465 OTV_Validator valid ) |
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466 { |
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467 FT_Bytes p = table; |
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468 FT_UInt FeatureCount; |
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469 |
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470 |
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471 OTV_NAME_ENTER( "FeatureList" ); |
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472 |
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473 OTV_LIMIT_CHECK( 2 ); |
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474 FeatureCount = FT_NEXT_USHORT( p ); |
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475 |
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476 OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
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477 |
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478 OTV_LIMIT_CHECK( FeatureCount * 2 ); |
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479 |
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480 valid->lookup_count = otv_LookupList_get_count( lookups ); |
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481 |
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482 /* FeatureRecord */ |
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483 for ( ; FeatureCount > 0; FeatureCount-- ) |
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484 { |
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485 p += 4; /* skip FeatureTag */ |
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486 |
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487 /* Feature */ |
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488 otv_Feature_validate( table + FT_NEXT_USHORT( p ), valid ); |
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489 } |
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490 |
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491 OTV_EXIT; |
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492 } |
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493 |
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494 |
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495 /*************************************************************************/ |
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496 /*************************************************************************/ |
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497 /***** *****/ |
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498 /***** LANGUAGE SYSTEM *****/ |
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499 /***** *****/ |
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500 /*************************************************************************/ |
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501 /*************************************************************************/ |
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502 |
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503 |
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504 /* uses valid->extra1 (number of features) */ |
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505 |
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506 FT_LOCAL_DEF( void ) |
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507 otv_LangSys_validate( FT_Bytes table, |
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508 OTV_Validator valid ) |
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509 { |
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510 FT_Bytes p = table; |
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511 FT_UInt ReqFeatureIndex; |
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512 FT_UInt FeatureCount; |
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513 |
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514 |
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515 OTV_NAME_ENTER( "LangSys" ); |
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516 |
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517 OTV_LIMIT_CHECK( 6 ); |
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518 p += 2; /* skip LookupOrder (unused) */ |
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519 ReqFeatureIndex = FT_NEXT_USHORT( p ); |
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520 FeatureCount = FT_NEXT_USHORT( p ); |
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521 |
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522 OTV_TRACE(( " (ReqFeatureIndex = %d)\n", ReqFeatureIndex )); |
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523 OTV_TRACE(( " (FeatureCount = %d)\n", FeatureCount )); |
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524 |
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525 if ( ReqFeatureIndex != 0xFFFFU && ReqFeatureIndex >= valid->extra1 ) |
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526 FT_INVALID_DATA; |
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527 |
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528 OTV_LIMIT_CHECK( FeatureCount * 2 ); |
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529 |
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530 /* FeatureIndex */ |
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531 for ( ; FeatureCount > 0; FeatureCount-- ) |
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532 if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
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533 FT_INVALID_DATA; |
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534 |
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535 OTV_EXIT; |
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536 } |
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537 |
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538 |
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539 /*************************************************************************/ |
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540 /*************************************************************************/ |
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541 /***** *****/ |
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542 /***** SCRIPTS *****/ |
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543 /***** *****/ |
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544 /*************************************************************************/ |
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545 /*************************************************************************/ |
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546 |
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547 FT_LOCAL_DEF( void ) |
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548 otv_Script_validate( FT_Bytes table, |
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549 OTV_Validator valid ) |
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550 { |
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551 FT_UInt DefaultLangSys, LangSysCount; |
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552 FT_Bytes p = table; |
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553 |
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554 |
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555 OTV_NAME_ENTER( "Script" ); |
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556 |
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557 OTV_LIMIT_CHECK( 4 ); |
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558 DefaultLangSys = FT_NEXT_USHORT( p ); |
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559 LangSysCount = FT_NEXT_USHORT( p ); |
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560 |
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561 OTV_TRACE(( " (LangSysCount = %d)\n", LangSysCount )); |
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562 |
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563 if ( DefaultLangSys != 0 ) |
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564 otv_LangSys_validate( table + DefaultLangSys, valid ); |
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565 |
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566 OTV_LIMIT_CHECK( LangSysCount * 6 ); |
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567 |
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568 /* LangSysRecord */ |
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569 for ( ; LangSysCount > 0; LangSysCount-- ) |
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570 { |
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571 p += 4; /* skip LangSysTag */ |
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572 |
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573 /* LangSys */ |
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574 otv_LangSys_validate( table + FT_NEXT_USHORT( p ), valid ); |
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575 } |
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576 |
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577 OTV_EXIT; |
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578 } |
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579 |
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580 |
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581 /* sets valid->extra1 (number of features) */ |
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582 |
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583 FT_LOCAL_DEF( void ) |
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584 otv_ScriptList_validate( FT_Bytes table, |
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585 FT_Bytes features, |
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586 OTV_Validator valid ) |
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587 { |
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588 FT_UInt ScriptCount; |
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589 FT_Bytes p = table; |
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590 |
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591 |
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592 OTV_NAME_ENTER( "ScriptList" ); |
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593 |
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594 OTV_LIMIT_CHECK( 2 ); |
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595 ScriptCount = FT_NEXT_USHORT( p ); |
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596 |
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597 OTV_TRACE(( " (ScriptCount = %d)\n", ScriptCount )); |
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598 |
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599 OTV_LIMIT_CHECK( ScriptCount * 6 ); |
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600 |
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601 valid->extra1 = otv_Feature_get_count( features ); |
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602 |
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603 /* ScriptRecord */ |
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604 for ( ; ScriptCount > 0; ScriptCount-- ) |
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605 { |
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606 p += 4; /* skip ScriptTag */ |
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607 |
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608 otv_Script_validate( table + FT_NEXT_USHORT( p ), valid ); /* Script */ |
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609 } |
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610 |
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611 OTV_EXIT; |
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612 } |
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613 |
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614 |
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615 /*************************************************************************/ |
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616 /*************************************************************************/ |
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617 /***** *****/ |
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618 /***** UTILITY FUNCTIONS *****/ |
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619 /***** *****/ |
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620 /*************************************************************************/ |
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621 /*************************************************************************/ |
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622 |
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623 /* |
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624 u: uint16 |
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625 ux: unit16 [x] |
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626 |
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627 s: struct |
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628 sx: struct [x] |
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629 sxy: struct [x], using external y count |
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630 |
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631 x: uint16 x |
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632 |
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633 C: Coverage |
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634 |
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635 O: Offset |
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636 On: Offset (NULL) |
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637 Ox: Offset [x] |
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638 Onx: Offset (NULL) [x] |
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639 */ |
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640 |
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641 FT_LOCAL_DEF( void ) |
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642 otv_x_Ox( FT_Bytes table, |
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643 OTV_Validator valid ) |
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644 { |
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645 FT_Bytes p = table; |
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646 FT_UInt Count; |
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647 OTV_Validate_Func func; |
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648 |
|
649 |
|
650 OTV_ENTER; |
|
651 |
|
652 OTV_LIMIT_CHECK( 2 ); |
|
653 Count = FT_NEXT_USHORT( p ); |
|
654 |
|
655 OTV_TRACE(( " (Count = %d)\n", Count )); |
|
656 |
|
657 OTV_LIMIT_CHECK( Count * 2 ); |
|
658 |
|
659 valid->nesting_level++; |
|
660 func = valid->func[valid->nesting_level]; |
|
661 |
|
662 for ( ; Count > 0; Count-- ) |
|
663 func( table + FT_NEXT_USHORT( p ), valid ); |
|
664 |
|
665 valid->nesting_level--; |
|
666 |
|
667 OTV_EXIT; |
|
668 } |
|
669 |
|
670 |
|
671 FT_LOCAL_DEF( void ) |
|
672 otv_u_C_x_Ox( FT_Bytes table, |
|
673 OTV_Validator valid ) |
|
674 { |
|
675 FT_Bytes p = table; |
|
676 FT_UInt Count, Coverage; |
|
677 OTV_Validate_Func func; |
|
678 |
|
679 |
|
680 OTV_ENTER; |
|
681 |
|
682 p += 2; /* skip Format */ |
|
683 |
|
684 OTV_LIMIT_CHECK( 4 ); |
|
685 Coverage = FT_NEXT_USHORT( p ); |
|
686 Count = FT_NEXT_USHORT( p ); |
|
687 |
|
688 OTV_TRACE(( " (Count = %d)\n", Count )); |
|
689 |
|
690 otv_Coverage_validate( table + Coverage, valid, Count ); |
|
691 |
|
692 OTV_LIMIT_CHECK( Count * 2 ); |
|
693 |
|
694 valid->nesting_level++; |
|
695 func = valid->func[valid->nesting_level]; |
|
696 |
|
697 for ( ; Count > 0; Count-- ) |
|
698 func( table + FT_NEXT_USHORT( p ), valid ); |
|
699 |
|
700 valid->nesting_level--; |
|
701 |
|
702 OTV_EXIT; |
|
703 } |
|
704 |
|
705 |
|
706 /* uses valid->extra1 (if > 0: array value limit) */ |
|
707 |
|
708 FT_LOCAL_DEF( void ) |
|
709 otv_x_ux( FT_Bytes table, |
|
710 OTV_Validator valid ) |
|
711 { |
|
712 FT_Bytes p = table; |
|
713 FT_UInt Count; |
|
714 |
|
715 |
|
716 OTV_ENTER; |
|
717 |
|
718 OTV_LIMIT_CHECK( 2 ); |
|
719 Count = FT_NEXT_USHORT( p ); |
|
720 |
|
721 OTV_TRACE(( " (Count = %d)\n", Count )); |
|
722 |
|
723 OTV_LIMIT_CHECK( Count * 2 ); |
|
724 |
|
725 if ( valid->extra1 ) |
|
726 { |
|
727 for ( ; Count > 0; Count-- ) |
|
728 if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
|
729 FT_INVALID_DATA; |
|
730 } |
|
731 |
|
732 OTV_EXIT; |
|
733 } |
|
734 |
|
735 |
|
736 /* `ux' in the function's name is not really correct since only x-1 */ |
|
737 /* elements are tested */ |
|
738 |
|
739 /* uses valid->extra1 (array value limit) */ |
|
740 |
|
741 FT_LOCAL_DEF( void ) |
|
742 otv_x_y_ux_sy( FT_Bytes table, |
|
743 OTV_Validator valid ) |
|
744 { |
|
745 FT_Bytes p = table; |
|
746 FT_UInt Count1, Count2; |
|
747 |
|
748 |
|
749 OTV_ENTER; |
|
750 |
|
751 OTV_LIMIT_CHECK( 4 ); |
|
752 Count1 = FT_NEXT_USHORT( p ); |
|
753 Count2 = FT_NEXT_USHORT( p ); |
|
754 |
|
755 OTV_TRACE(( " (Count1 = %d)\n", Count1 )); |
|
756 OTV_TRACE(( " (Count2 = %d)\n", Count2 )); |
|
757 |
|
758 if ( Count1 == 0 ) |
|
759 FT_INVALID_DATA; |
|
760 |
|
761 OTV_LIMIT_CHECK( ( Count1 - 1 ) * 2 + Count2 * 4 ); |
|
762 p += ( Count1 - 1 ) * 2; |
|
763 |
|
764 for ( ; Count2 > 0; Count2-- ) |
|
765 { |
|
766 if ( FT_NEXT_USHORT( p ) >= Count1 ) |
|
767 FT_INVALID_DATA; |
|
768 |
|
769 if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
|
770 FT_INVALID_DATA; |
|
771 } |
|
772 |
|
773 OTV_EXIT; |
|
774 } |
|
775 |
|
776 |
|
777 /* `uy' in the function's name is not really correct since only y-1 */ |
|
778 /* elements are tested */ |
|
779 |
|
780 /* uses valid->extra1 (array value limit) */ |
|
781 |
|
782 FT_LOCAL_DEF( void ) |
|
783 otv_x_ux_y_uy_z_uz_p_sp( FT_Bytes table, |
|
784 OTV_Validator valid ) |
|
785 { |
|
786 FT_Bytes p = table; |
|
787 FT_UInt BacktrackCount, InputCount, LookaheadCount; |
|
788 FT_UInt Count; |
|
789 |
|
790 |
|
791 OTV_ENTER; |
|
792 |
|
793 OTV_LIMIT_CHECK( 2 ); |
|
794 BacktrackCount = FT_NEXT_USHORT( p ); |
|
795 |
|
796 OTV_TRACE(( " (BacktrackCount = %d)\n", BacktrackCount )); |
|
797 |
|
798 OTV_LIMIT_CHECK( BacktrackCount * 2 + 2 ); |
|
799 p += BacktrackCount * 2; |
|
800 |
|
801 InputCount = FT_NEXT_USHORT( p ); |
|
802 if ( InputCount == 0 ) |
|
803 FT_INVALID_DATA; |
|
804 |
|
805 OTV_TRACE(( " (InputCount = %d)\n", InputCount )); |
|
806 |
|
807 OTV_LIMIT_CHECK( InputCount * 2 ); |
|
808 p += ( InputCount - 1 ) * 2; |
|
809 |
|
810 LookaheadCount = FT_NEXT_USHORT( p ); |
|
811 |
|
812 OTV_TRACE(( " (LookaheadCount = %d)\n", LookaheadCount )); |
|
813 |
|
814 OTV_LIMIT_CHECK( LookaheadCount * 2 + 2 ); |
|
815 p += LookaheadCount * 2; |
|
816 |
|
817 Count = FT_NEXT_USHORT( p ); |
|
818 |
|
819 OTV_TRACE(( " (Count = %d)\n", Count )); |
|
820 |
|
821 OTV_LIMIT_CHECK( Count * 4 ); |
|
822 |
|
823 for ( ; Count > 0; Count-- ) |
|
824 { |
|
825 if ( FT_NEXT_USHORT( p ) >= InputCount ) |
|
826 FT_INVALID_DATA; |
|
827 |
|
828 if ( FT_NEXT_USHORT( p ) >= valid->extra1 ) |
|
829 FT_INVALID_DATA; |
|
830 } |
|
831 |
|
832 OTV_EXIT; |
|
833 } |
|
834 |
|
835 |
|
836 /* sets valid->extra1 (valid->lookup_count) */ |
|
837 |
|
838 FT_LOCAL_DEF( void ) |
|
839 otv_u_O_O_x_Onx( FT_Bytes table, |
|
840 OTV_Validator valid ) |
|
841 { |
|
842 FT_Bytes p = table; |
|
843 FT_UInt Coverage, ClassDef, ClassSetCount; |
|
844 OTV_Validate_Func func; |
|
845 |
|
846 |
|
847 OTV_ENTER; |
|
848 |
|
849 p += 2; /* skip Format */ |
|
850 |
|
851 OTV_LIMIT_CHECK( 6 ); |
|
852 Coverage = FT_NEXT_USHORT( p ); |
|
853 ClassDef = FT_NEXT_USHORT( p ); |
|
854 ClassSetCount = FT_NEXT_USHORT( p ); |
|
855 |
|
856 OTV_TRACE(( " (ClassSetCount = %d)\n", ClassSetCount )); |
|
857 |
|
858 otv_Coverage_validate( table + Coverage, valid, -1 ); |
|
859 otv_ClassDef_validate( table + ClassDef, valid ); |
|
860 |
|
861 OTV_LIMIT_CHECK( ClassSetCount * 2 ); |
|
862 |
|
863 valid->nesting_level++; |
|
864 func = valid->func[valid->nesting_level]; |
|
865 valid->extra1 = valid->lookup_count; |
|
866 |
|
867 for ( ; ClassSetCount > 0; ClassSetCount-- ) |
|
868 { |
|
869 FT_UInt offset = FT_NEXT_USHORT( p ); |
|
870 |
|
871 |
|
872 if ( offset ) |
|
873 func( table + offset, valid ); |
|
874 } |
|
875 |
|
876 valid->nesting_level--; |
|
877 |
|
878 OTV_EXIT; |
|
879 } |
|
880 |
|
881 |
|
882 /* uses valid->lookup_count */ |
|
883 |
|
884 FT_LOCAL_DEF( void ) |
|
885 otv_u_x_y_Ox_sy( FT_Bytes table, |
|
886 OTV_Validator valid ) |
|
887 { |
|
888 FT_Bytes p = table; |
|
889 FT_UInt GlyphCount, Count, count1; |
|
890 |
|
891 |
|
892 OTV_ENTER; |
|
893 |
|
894 p += 2; /* skip Format */ |
|
895 |
|
896 OTV_LIMIT_CHECK( 4 ); |
|
897 GlyphCount = FT_NEXT_USHORT( p ); |
|
898 Count = FT_NEXT_USHORT( p ); |
|
899 |
|
900 OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount )); |
|
901 OTV_TRACE(( " (Count = %d)\n", Count )); |
|
902 |
|
903 OTV_LIMIT_CHECK( GlyphCount * 2 + Count * 4 ); |
|
904 |
|
905 for ( count1 = GlyphCount; count1 > 0; count1-- ) |
|
906 otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 ); |
|
907 |
|
908 for ( ; Count > 0; Count-- ) |
|
909 { |
|
910 if ( FT_NEXT_USHORT( p ) >= GlyphCount ) |
|
911 FT_INVALID_DATA; |
|
912 |
|
913 if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
|
914 FT_INVALID_DATA; |
|
915 } |
|
916 |
|
917 OTV_EXIT; |
|
918 } |
|
919 |
|
920 |
|
921 /* sets valid->extra1 (valid->lookup_count) */ |
|
922 |
|
923 FT_LOCAL_DEF( void ) |
|
924 otv_u_O_O_O_O_x_Onx( FT_Bytes table, |
|
925 OTV_Validator valid ) |
|
926 { |
|
927 FT_Bytes p = table; |
|
928 FT_UInt Coverage; |
|
929 FT_UInt BacktrackClassDef, InputClassDef, LookaheadClassDef; |
|
930 FT_UInt ChainClassSetCount; |
|
931 OTV_Validate_Func func; |
|
932 |
|
933 |
|
934 OTV_ENTER; |
|
935 |
|
936 p += 2; /* skip Format */ |
|
937 |
|
938 OTV_LIMIT_CHECK( 10 ); |
|
939 Coverage = FT_NEXT_USHORT( p ); |
|
940 BacktrackClassDef = FT_NEXT_USHORT( p ); |
|
941 InputClassDef = FT_NEXT_USHORT( p ); |
|
942 LookaheadClassDef = FT_NEXT_USHORT( p ); |
|
943 ChainClassSetCount = FT_NEXT_USHORT( p ); |
|
944 |
|
945 OTV_TRACE(( " (ChainClassSetCount = %d)\n", ChainClassSetCount )); |
|
946 |
|
947 otv_Coverage_validate( table + Coverage, valid, -1 ); |
|
948 |
|
949 otv_ClassDef_validate( table + BacktrackClassDef, valid ); |
|
950 otv_ClassDef_validate( table + InputClassDef, valid ); |
|
951 otv_ClassDef_validate( table + LookaheadClassDef, valid ); |
|
952 |
|
953 OTV_LIMIT_CHECK( ChainClassSetCount * 2 ); |
|
954 |
|
955 valid->nesting_level++; |
|
956 func = valid->func[valid->nesting_level]; |
|
957 valid->extra1 = valid->lookup_count; |
|
958 |
|
959 for ( ; ChainClassSetCount > 0; ChainClassSetCount-- ) |
|
960 { |
|
961 FT_UInt offset = FT_NEXT_USHORT( p ); |
|
962 |
|
963 |
|
964 if ( offset ) |
|
965 func( table + offset, valid ); |
|
966 } |
|
967 |
|
968 valid->nesting_level--; |
|
969 |
|
970 OTV_EXIT; |
|
971 } |
|
972 |
|
973 |
|
974 /* uses valid->lookup_count */ |
|
975 |
|
976 FT_LOCAL_DEF( void ) |
|
977 otv_u_x_Ox_y_Oy_z_Oz_p_sp( FT_Bytes table, |
|
978 OTV_Validator valid ) |
|
979 { |
|
980 FT_Bytes p = table; |
|
981 FT_UInt BacktrackGlyphCount, InputGlyphCount, LookaheadGlyphCount; |
|
982 FT_UInt count1, count2; |
|
983 |
|
984 |
|
985 OTV_ENTER; |
|
986 |
|
987 p += 2; /* skip Format */ |
|
988 |
|
989 OTV_LIMIT_CHECK( 2 ); |
|
990 BacktrackGlyphCount = FT_NEXT_USHORT( p ); |
|
991 |
|
992 OTV_TRACE(( " (BacktrackGlyphCount = %d)\n", BacktrackGlyphCount )); |
|
993 |
|
994 OTV_LIMIT_CHECK( BacktrackGlyphCount * 2 + 2 ); |
|
995 |
|
996 for ( ; BacktrackGlyphCount > 0; BacktrackGlyphCount-- ) |
|
997 otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 ); |
|
998 |
|
999 InputGlyphCount = FT_NEXT_USHORT( p ); |
|
1000 |
|
1001 OTV_TRACE(( " (InputGlyphCount = %d)\n", InputGlyphCount )); |
|
1002 |
|
1003 OTV_LIMIT_CHECK( InputGlyphCount * 2 + 2 ); |
|
1004 |
|
1005 for ( count1 = InputGlyphCount; count1 > 0; count1-- ) |
|
1006 otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 ); |
|
1007 |
|
1008 LookaheadGlyphCount = FT_NEXT_USHORT( p ); |
|
1009 |
|
1010 OTV_TRACE(( " (LookaheadGlyphCount = %d)\n", LookaheadGlyphCount )); |
|
1011 |
|
1012 OTV_LIMIT_CHECK( LookaheadGlyphCount * 2 + 2 ); |
|
1013 |
|
1014 for ( ; LookaheadGlyphCount > 0; LookaheadGlyphCount-- ) |
|
1015 otv_Coverage_validate( table + FT_NEXT_USHORT( p ), valid, -1 ); |
|
1016 |
|
1017 count2 = FT_NEXT_USHORT( p ); |
|
1018 |
|
1019 OTV_TRACE(( " (Count = %d)\n", count2 )); |
|
1020 |
|
1021 OTV_LIMIT_CHECK( count2 * 4 ); |
|
1022 |
|
1023 for ( ; count2 > 0; count2-- ) |
|
1024 { |
|
1025 if ( FT_NEXT_USHORT( p ) >= InputGlyphCount ) |
|
1026 FT_INVALID_DATA; |
|
1027 |
|
1028 if ( FT_NEXT_USHORT( p ) >= valid->lookup_count ) |
|
1029 FT_INVALID_DATA; |
|
1030 } |
|
1031 |
|
1032 OTV_EXIT; |
|
1033 } |
|
1034 |
|
1035 |
|
1036 FT_LOCAL_DEF( FT_UInt ) |
|
1037 otv_GSUBGPOS_get_Lookup_count( FT_Bytes table ) |
|
1038 { |
|
1039 FT_Bytes p = table + 8; |
|
1040 |
|
1041 |
|
1042 return otv_LookupList_get_count( table + FT_NEXT_USHORT( p ) ); |
|
1043 } |
|
1044 |
|
1045 |
|
1046 FT_LOCAL_DEF( FT_UInt ) |
|
1047 otv_GSUBGPOS_have_MarkAttachmentType_flag( FT_Bytes table ) |
|
1048 { |
|
1049 FT_Bytes p, lookup; |
|
1050 FT_UInt count; |
|
1051 |
|
1052 |
|
1053 if ( !table ) |
|
1054 return 0; |
|
1055 |
|
1056 /* LookupList */ |
|
1057 p = table + 8; |
|
1058 table += FT_NEXT_USHORT( p ); |
|
1059 |
|
1060 /* LookupCount */ |
|
1061 p = table; |
|
1062 count = FT_NEXT_USHORT( p ); |
|
1063 |
|
1064 for ( ; count > 0; count-- ) |
|
1065 { |
|
1066 FT_Bytes oldp; |
|
1067 |
|
1068 |
|
1069 /* Lookup */ |
|
1070 lookup = table + FT_NEXT_USHORT( p ); |
|
1071 |
|
1072 oldp = p; |
|
1073 |
|
1074 /* LookupFlag */ |
|
1075 p = lookup + 2; |
|
1076 if ( FT_NEXT_USHORT( p ) & 0xFF00U ) |
|
1077 return 1; |
|
1078 |
|
1079 p = oldp; |
|
1080 } |
|
1081 |
|
1082 return 0; |
|
1083 } |
|
1084 |
|
1085 |
|
1086 /* END */ |
|