1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvkern.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT kern table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2004, 2005, 2006, 2007 */ |
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8 /* by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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10 /* */ |
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11 /* This file is part of the FreeType project, and may only be used, */ |
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12 /* modified, and distributed under the terms of the FreeType project */ |
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13 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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14 /* this file you indicate that you have read the license and */ |
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15 /* understand and accept it fully. */ |
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16 /* */ |
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17 /***************************************************************************/ |
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18 |
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19 /***************************************************************************/ |
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20 /* */ |
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21 /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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22 /* Development of gxlayout is supported by the Information-technology */ |
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23 /* Promotion Agency(IPA), Japan. */ |
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24 /* */ |
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25 /***************************************************************************/ |
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26 |
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27 |
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28 #include "gxvalid.h" |
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29 #include "gxvcommn.h" |
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30 |
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31 #include FT_SFNT_NAMES_H |
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32 #include FT_SERVICE_GX_VALIDATE_H |
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33 |
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34 |
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35 /*************************************************************************/ |
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36 /* */ |
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37 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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38 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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39 /* messages during execution. */ |
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40 /* */ |
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41 #undef FT_COMPONENT |
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42 #define FT_COMPONENT trace_gxvkern |
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43 |
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44 |
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45 /*************************************************************************/ |
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46 /*************************************************************************/ |
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47 /***** *****/ |
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48 /***** Data and Types *****/ |
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49 /***** *****/ |
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50 /*************************************************************************/ |
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51 /*************************************************************************/ |
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52 |
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53 typedef enum GXV_kern_Version_ |
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54 { |
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55 KERN_VERSION_CLASSIC = 0x0000, |
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56 KERN_VERSION_NEW = 0x0001 |
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57 |
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58 } GXV_kern_Version; |
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59 |
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60 |
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61 typedef enum GXV_kern_Dialect_ |
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62 { |
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63 KERN_DIALECT_UNKNOWN = 0, |
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64 KERN_DIALECT_MS = FT_VALIDATE_MS, |
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65 KERN_DIALECT_APPLE = FT_VALIDATE_APPLE, |
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66 KERN_DIALECT_ANY = FT_VALIDATE_CKERN |
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67 |
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68 } GXV_kern_Dialect; |
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69 |
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70 |
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71 typedef struct GXV_kern_DataRec_ |
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72 { |
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73 GXV_kern_Version version; |
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74 void *subtable_data; |
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75 GXV_kern_Dialect dialect_request; |
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76 |
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77 } GXV_kern_DataRec, *GXV_kern_Data; |
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78 |
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79 |
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80 #define GXV_KERN_DATA( field ) GXV_TABLE_DATA( kern, field ) |
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81 |
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82 #define KERN_IS_CLASSIC( valid ) \ |
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83 ( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) ) |
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84 #define KERN_IS_NEW( valid ) \ |
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85 ( KERN_VERSION_NEW == GXV_KERN_DATA( version ) ) |
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86 |
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87 #define KERN_DIALECT( valid ) \ |
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88 GXV_KERN_DATA( dialect_request ) |
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89 #define KERN_ALLOWS_MS( valid ) \ |
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90 ( KERN_DIALECT( valid ) & KERN_DIALECT_MS ) |
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91 #define KERN_ALLOWS_APPLE( valid ) \ |
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92 ( KERN_DIALECT( valid ) & KERN_DIALECT_APPLE ) |
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93 |
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94 #define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 4 ) |
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95 #define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 6 ) |
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96 |
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97 |
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98 /*************************************************************************/ |
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99 /*************************************************************************/ |
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100 /***** *****/ |
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101 /***** SUBTABLE VALIDATORS *****/ |
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102 /***** *****/ |
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103 /*************************************************************************/ |
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104 /*************************************************************************/ |
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105 |
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106 |
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107 /* ============================= format 0 ============================== */ |
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108 |
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109 static void |
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110 gxv_kern_subtable_fmt0_pairs_validate( FT_Bytes table, |
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111 FT_Bytes limit, |
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112 FT_UShort nPairs, |
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113 GXV_Validator valid ) |
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114 { |
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115 FT_Bytes p = table; |
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116 FT_UShort i; |
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117 |
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118 FT_UShort last_gid_left = 0; |
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119 FT_UShort last_gid_right = 0; |
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120 |
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121 FT_UNUSED( limit ); |
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122 |
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123 |
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124 GXV_NAME_ENTER( "kern format 0 pairs" ); |
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125 |
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126 for ( i = 0; i < nPairs; i++ ) |
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127 { |
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128 FT_UShort gid_left; |
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129 FT_UShort gid_right; |
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130 FT_Short kernValue; |
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131 |
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132 |
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133 /* left */ |
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134 gid_left = FT_NEXT_USHORT( p ); |
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135 gxv_glyphid_validate( gid_left, valid ); |
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136 |
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137 /* right */ |
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138 gid_right = FT_NEXT_USHORT( p ); |
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139 gxv_glyphid_validate( gid_right, valid ); |
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140 |
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141 /* Pairs of left and right GIDs must be unique and sorted. */ |
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142 GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right )); |
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143 if ( gid_left == last_gid_left ) |
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144 { |
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145 if ( last_gid_right < gid_right ) |
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146 last_gid_right = gid_right; |
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147 else |
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148 FT_INVALID_DATA; |
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149 } |
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150 else if ( last_gid_left < gid_left ) |
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151 { |
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152 last_gid_left = gid_left; |
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153 last_gid_right = gid_right; |
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154 } |
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155 else |
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156 FT_INVALID_DATA; |
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157 |
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158 /* skip the kern value */ |
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159 kernValue = FT_NEXT_SHORT( p ); |
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160 } |
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161 |
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162 GXV_EXIT; |
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163 } |
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164 |
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165 static void |
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166 gxv_kern_subtable_fmt0_validate( FT_Bytes table, |
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167 FT_Bytes limit, |
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168 GXV_Validator valid ) |
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169 { |
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170 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
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171 |
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172 FT_UShort nPairs; |
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173 FT_UShort unitSize; |
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174 |
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175 |
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176 GXV_NAME_ENTER( "kern subtable format 0" ); |
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177 |
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178 unitSize = 2 + 2 + 2; |
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179 nPairs = 0; |
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180 |
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181 /* nPairs, searchRange, entrySelector, rangeShift */ |
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182 GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); |
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183 gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, valid ); |
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184 p += 2 + 2 + 2 + 2; |
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185 |
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186 gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, valid ); |
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187 |
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188 GXV_EXIT; |
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189 } |
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190 |
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191 |
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192 /* ============================= format 1 ============================== */ |
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193 |
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194 |
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195 typedef struct GXV_kern_fmt1_StateOptRec_ |
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196 { |
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197 FT_UShort valueTable; |
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198 FT_UShort valueTable_length; |
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199 |
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200 } GXV_kern_fmt1_StateOptRec, *GXV_kern_fmt1_StateOptRecData; |
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201 |
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202 |
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203 static void |
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204 gxv_kern_subtable_fmt1_valueTable_load( FT_Bytes table, |
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205 FT_Bytes limit, |
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206 GXV_Validator valid ) |
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207 { |
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208 FT_Bytes p = table; |
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209 GXV_kern_fmt1_StateOptRecData optdata = |
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210 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata; |
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211 |
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212 |
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213 GXV_LIMIT_CHECK( 2 ); |
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214 optdata->valueTable = FT_NEXT_USHORT( p ); |
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215 } |
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216 |
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217 |
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218 /* |
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219 * passed tables_size covers whole StateTable, including kern fmt1 header |
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220 */ |
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221 static void |
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222 gxv_kern_subtable_fmt1_subtable_setup( FT_UShort table_size, |
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223 FT_UShort classTable, |
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224 FT_UShort stateArray, |
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225 FT_UShort entryTable, |
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226 FT_UShort* classTable_length_p, |
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227 FT_UShort* stateArray_length_p, |
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228 FT_UShort* entryTable_length_p, |
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229 GXV_Validator valid ) |
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230 { |
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231 FT_UShort o[4]; |
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232 FT_UShort *l[4]; |
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233 FT_UShort buff[5]; |
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234 |
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235 GXV_kern_fmt1_StateOptRecData optdata = |
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236 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata; |
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237 |
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238 |
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239 o[0] = classTable; |
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240 o[1] = stateArray; |
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241 o[2] = entryTable; |
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242 o[3] = optdata->valueTable; |
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243 l[0] = classTable_length_p; |
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244 l[1] = stateArray_length_p; |
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245 l[2] = entryTable_length_p; |
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246 l[3] = &(optdata->valueTable_length); |
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247 |
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248 gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid ); |
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249 } |
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250 |
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251 |
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252 /* |
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253 * passed table & limit are of whole StateTable, not including subtables |
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254 */ |
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255 static void |
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256 gxv_kern_subtable_fmt1_entry_validate( |
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257 FT_Byte state, |
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258 FT_UShort flags, |
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259 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
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260 FT_Bytes table, |
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261 FT_Bytes limit, |
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262 GXV_Validator valid ) |
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263 { |
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264 FT_UShort push; |
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265 FT_UShort dontAdvance; |
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266 FT_UShort valueOffset; |
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267 FT_UShort kernAction; |
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268 FT_UShort kernValue; |
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269 |
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270 FT_UNUSED( state ); |
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271 FT_UNUSED( glyphOffset_p ); |
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272 |
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273 |
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274 push = (FT_UShort)( ( flags >> 15 ) & 1 ); |
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275 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
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276 valueOffset = (FT_UShort)( flags & 0x3FFF ); |
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277 |
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278 { |
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279 GXV_kern_fmt1_StateOptRecData vt_rec = |
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280 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata; |
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281 FT_Bytes p; |
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282 |
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283 |
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284 if ( valueOffset < vt_rec->valueTable ) |
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285 FT_INVALID_OFFSET; |
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286 |
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287 p = table + valueOffset; |
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288 limit = table + vt_rec->valueTable + vt_rec->valueTable_length; |
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289 |
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290 GXV_LIMIT_CHECK( 2 + 2 ); |
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291 kernAction = FT_NEXT_USHORT( p ); |
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292 kernValue = FT_NEXT_USHORT( p ); |
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293 } |
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294 } |
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295 |
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296 |
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297 static void |
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298 gxv_kern_subtable_fmt1_validate( FT_Bytes table, |
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299 FT_Bytes limit, |
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300 GXV_Validator valid ) |
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301 { |
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302 FT_Bytes p = table; |
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303 GXV_kern_fmt1_StateOptRec vt_rec; |
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304 |
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305 |
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306 GXV_NAME_ENTER( "kern subtable format 1" ); |
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307 |
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308 valid->statetable.optdata = |
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309 &vt_rec; |
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310 valid->statetable.optdata_load_func = |
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311 gxv_kern_subtable_fmt1_valueTable_load; |
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312 valid->statetable.subtable_setup_func = |
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313 gxv_kern_subtable_fmt1_subtable_setup; |
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314 valid->statetable.entry_glyphoffset_fmt = |
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315 GXV_GLYPHOFFSET_NONE; |
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316 valid->statetable.entry_validate_func = |
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317 gxv_kern_subtable_fmt1_entry_validate; |
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318 |
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319 gxv_StateTable_validate( p, limit, valid ); |
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320 |
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321 GXV_EXIT; |
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322 } |
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323 |
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324 |
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325 /* ================ Data for Class-Based Subtables 2, 3 ================ */ |
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326 |
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327 typedef enum GXV_kern_ClassSpec_ |
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328 { |
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329 GXV_KERN_CLS_L = 0, |
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330 GXV_KERN_CLS_R |
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331 |
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332 } GXV_kern_ClassSpec; |
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333 |
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334 |
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335 /* ============================= format 2 ============================== */ |
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336 |
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337 /* ---------------------- format 2 specific data ----------------------- */ |
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338 |
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339 typedef struct GXV_kern_subtable_fmt2_DataRec_ |
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340 { |
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341 FT_UShort rowWidth; |
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342 FT_UShort array; |
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343 FT_UShort offset_min[2]; |
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344 FT_UShort offset_max[2]; |
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345 const FT_String* class_tag[2]; |
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346 GXV_odtect_Range odtect; |
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347 |
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348 } GXV_kern_subtable_fmt2_DataRec, *GXV_kern_subtable_fmt2_Data; |
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349 |
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350 |
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351 #define GXV_KERN_FMT2_DATA( field ) \ |
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352 ( ( (GXV_kern_subtable_fmt2_DataRec *) \ |
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353 ( GXV_KERN_DATA( subtable_data ) ) )->field ) |
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354 |
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355 |
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356 /* -------------------------- utility functions ----------------------- */ |
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357 |
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358 static void |
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359 gxv_kern_subtable_fmt2_clstbl_validate( FT_Bytes table, |
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360 FT_Bytes limit, |
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361 GXV_kern_ClassSpec spec, |
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362 GXV_Validator valid ) |
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363 { |
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364 const FT_String* tag = GXV_KERN_FMT2_DATA( class_tag[spec] ); |
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365 GXV_odtect_Range odtect = GXV_KERN_FMT2_DATA( odtect ); |
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366 |
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367 FT_Bytes p = table; |
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368 FT_UShort firstGlyph; |
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369 FT_UShort nGlyphs; |
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370 |
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371 |
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372 GXV_NAME_ENTER( "kern format 2 classTable" ); |
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373 |
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374 GXV_LIMIT_CHECK( 2 + 2 ); |
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375 firstGlyph = FT_NEXT_USHORT( p ); |
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376 nGlyphs = FT_NEXT_USHORT( p ); |
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377 GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n", |
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378 tag, firstGlyph, nGlyphs )); |
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379 |
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380 gxv_glyphid_validate( firstGlyph, valid ); |
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381 gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), valid ); |
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382 |
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383 gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ), |
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384 &( GXV_KERN_FMT2_DATA( offset_min[spec] ) ), |
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385 &( GXV_KERN_FMT2_DATA( offset_max[spec] ) ), |
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386 valid ); |
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387 |
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388 gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect ); |
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389 |
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390 GXV_EXIT; |
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391 } |
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392 |
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393 |
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394 static void |
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395 gxv_kern_subtable_fmt2_validate( FT_Bytes table, |
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396 FT_Bytes limit, |
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397 GXV_Validator valid ) |
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398 { |
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399 GXV_ODTECT( 3, odtect ); |
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400 GXV_kern_subtable_fmt2_DataRec fmt2_rec = |
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401 { 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL }; |
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402 |
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403 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
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404 FT_UShort leftOffsetTable; |
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405 FT_UShort rightOffsetTable; |
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406 |
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407 |
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408 GXV_NAME_ENTER( "kern subtable format 2" ); |
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409 |
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410 GXV_ODTECT_INIT( odtect ); |
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411 fmt2_rec.odtect = odtect; |
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412 GXV_KERN_DATA( subtable_data ) = &fmt2_rec; |
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413 |
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414 GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 ); |
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415 GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p ); |
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416 leftOffsetTable = FT_NEXT_USHORT( p ); |
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417 rightOffsetTable = FT_NEXT_USHORT( p ); |
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418 GXV_KERN_FMT2_DATA( array ) = FT_NEXT_USHORT( p ); |
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419 |
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420 GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) )); |
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421 |
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422 |
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423 GXV_LIMIT_CHECK( leftOffsetTable ); |
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424 GXV_LIMIT_CHECK( rightOffsetTable ); |
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425 GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) ); |
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426 |
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427 gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit, |
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428 GXV_KERN_CLS_L, valid ); |
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429 |
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430 gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit, |
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431 GXV_KERN_CLS_R, valid ); |
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432 |
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433 if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) + |
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434 GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] ) |
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435 < GXV_KERN_FMT2_DATA( array ) ) |
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436 FT_INVALID_OFFSET; |
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437 |
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438 gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ), |
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439 GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] ) |
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440 + GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] ) |
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441 - GXV_KERN_FMT2_DATA( array ), |
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442 "array", odtect ); |
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443 |
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444 gxv_odtect_validate( odtect, valid ); |
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445 |
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446 GXV_EXIT; |
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447 } |
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448 |
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449 |
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450 /* ============================= format 3 ============================== */ |
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451 |
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452 static void |
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453 gxv_kern_subtable_fmt3_validate( FT_Bytes table, |
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454 FT_Bytes limit, |
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455 GXV_Validator valid ) |
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456 { |
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457 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE; |
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458 FT_UShort glyphCount; |
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459 FT_Byte kernValueCount; |
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460 FT_Byte leftClassCount; |
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461 FT_Byte rightClassCount; |
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462 FT_Byte flags; |
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463 |
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464 |
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465 GXV_NAME_ENTER( "kern subtable format 3" ); |
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466 |
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467 GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 ); |
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468 glyphCount = FT_NEXT_USHORT( p ); |
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469 kernValueCount = FT_NEXT_BYTE( p ); |
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470 leftClassCount = FT_NEXT_BYTE( p ); |
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471 rightClassCount = FT_NEXT_BYTE( p ); |
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472 flags = FT_NEXT_BYTE( p ); |
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473 |
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474 if ( valid->face->num_glyphs != glyphCount ) |
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475 { |
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476 GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n", |
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477 valid->face->num_glyphs, glyphCount )); |
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478 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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479 FT_INVALID_GLYPH_ID; |
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480 } |
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481 |
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482 /* |
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483 * just skip kernValue[kernValueCount] |
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484 */ |
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485 GXV_LIMIT_CHECK( 2 * kernValueCount ); |
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486 p += 2 * kernValueCount; |
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487 |
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488 /* |
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489 * check leftClass[gid] < leftClassCount |
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490 */ |
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491 { |
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492 FT_Byte min, max; |
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493 |
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494 |
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495 GXV_LIMIT_CHECK( glyphCount ); |
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496 gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid ); |
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497 p += valid->subtable_length; |
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498 |
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499 if ( leftClassCount < max ) |
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500 FT_INVALID_DATA; |
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501 } |
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502 |
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503 /* |
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504 * check rightClass[gid] < rightClassCount |
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505 */ |
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506 { |
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507 FT_Byte min, max; |
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508 |
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509 |
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510 GXV_LIMIT_CHECK( glyphCount ); |
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511 gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid ); |
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512 p += valid->subtable_length; |
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513 |
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514 if ( rightClassCount < max ) |
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515 FT_INVALID_DATA; |
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516 } |
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517 |
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518 /* |
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519 * check kernIndex[i, j] < kernValueCount |
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520 */ |
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521 { |
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522 FT_UShort i, j; |
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523 |
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524 |
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525 for ( i = 0; i < leftClassCount; i++ ) |
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526 { |
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527 for ( j = 0; j < rightClassCount; j++ ) |
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528 { |
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529 GXV_LIMIT_CHECK( 1 ); |
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530 if ( kernValueCount < FT_NEXT_BYTE( p ) ) |
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531 FT_INVALID_OFFSET; |
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532 } |
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533 } |
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534 } |
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535 |
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536 valid->subtable_length = p - table; |
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537 |
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538 GXV_EXIT; |
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539 } |
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540 |
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541 |
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542 static FT_Bool |
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543 gxv_kern_coverage_new_apple_validate( FT_UShort coverage, |
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544 FT_UShort* format, |
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545 GXV_Validator valid ) |
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546 { |
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547 /* new Apple-dialect */ |
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548 FT_Bool kernVertical; |
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549 FT_Bool kernCrossStream; |
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550 FT_Bool kernVariation; |
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551 |
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552 FT_UNUSED( valid ); |
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553 |
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554 |
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555 /* reserved bits = 0 */ |
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556 if ( coverage & 0x1FFC ) |
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557 return 0; |
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558 |
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559 kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 ); |
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560 kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 ); |
|
561 kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 ); |
|
562 |
|
563 *format = (FT_UShort)( coverage & 0x0003 ); |
|
564 |
|
565 GXV_TRACE(( "new Apple-dialect: " |
|
566 "horizontal=%d, cross-stream=%d, variation=%d, format=%d\n", |
|
567 !kernVertical, kernCrossStream, kernVariation, *format )); |
|
568 |
|
569 GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); |
|
570 |
|
571 return 1; |
|
572 } |
|
573 |
|
574 |
|
575 static FT_Bool |
|
576 gxv_kern_coverage_classic_apple_validate( FT_UShort coverage, |
|
577 FT_UShort* format, |
|
578 GXV_Validator valid ) |
|
579 { |
|
580 /* classic Apple-dialect */ |
|
581 FT_Bool horizontal; |
|
582 FT_Bool cross_stream; |
|
583 |
|
584 |
|
585 /* check expected flags, but don't check if MS-dialect is impossible */ |
|
586 if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( valid ) ) |
|
587 return 0; |
|
588 |
|
589 /* reserved bits = 0 */ |
|
590 if ( coverage & 0x02FC ) |
|
591 return 0; |
|
592 |
|
593 horizontal = FT_BOOL( ( coverage >> 15 ) & 1 ); |
|
594 cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 ); |
|
595 |
|
596 *format = (FT_UShort)( coverage & 0x0003 ); |
|
597 |
|
598 GXV_TRACE(( "classic Apple-dialect: " |
|
599 "horizontal=%d, cross-stream=%d, format=%d\n", |
|
600 horizontal, cross_stream, *format )); |
|
601 |
|
602 /* format 1 requires GX State Machine, too new for classic */ |
|
603 if ( *format == 1 ) |
|
604 return 0; |
|
605 |
|
606 GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" )); |
|
607 |
|
608 return 1; |
|
609 } |
|
610 |
|
611 |
|
612 static FT_Bool |
|
613 gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage, |
|
614 FT_UShort* format, |
|
615 GXV_Validator valid ) |
|
616 { |
|
617 /* classic Microsoft-dialect */ |
|
618 FT_Bool horizontal; |
|
619 FT_Bool minimum; |
|
620 FT_Bool cross_stream; |
|
621 FT_Bool override; |
|
622 |
|
623 FT_UNUSED( valid ); |
|
624 |
|
625 |
|
626 /* reserved bits = 0 */ |
|
627 if ( coverage & 0xFDF0 ) |
|
628 return 0; |
|
629 |
|
630 horizontal = FT_BOOL( coverage & 1 ); |
|
631 minimum = FT_BOOL( ( coverage >> 1 ) & 1 ); |
|
632 cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 ); |
|
633 override = FT_BOOL( ( coverage >> 3 ) & 1 ); |
|
634 |
|
635 *format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 ); |
|
636 |
|
637 GXV_TRACE(( "classic Microsoft-dialect: " |
|
638 "horizontal=%d, minimum=%d, cross-stream=%d, " |
|
639 "override=%d, format=%d\n", |
|
640 horizontal, minimum, cross_stream, override, *format )); |
|
641 |
|
642 if ( *format == 2 ) |
|
643 GXV_TRACE(( |
|
644 "kerning values in Microsoft format 2 subtable are ignored\n" )); |
|
645 |
|
646 return 1; |
|
647 } |
|
648 |
|
649 |
|
650 /*************************************************************************/ |
|
651 /*************************************************************************/ |
|
652 /***** *****/ |
|
653 /***** MAIN *****/ |
|
654 /***** *****/ |
|
655 /*************************************************************************/ |
|
656 /*************************************************************************/ |
|
657 |
|
658 static GXV_kern_Dialect |
|
659 gxv_kern_coverage_validate( FT_UShort coverage, |
|
660 FT_UShort* format, |
|
661 GXV_Validator valid ) |
|
662 { |
|
663 GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN; |
|
664 |
|
665 |
|
666 GXV_NAME_ENTER( "validating coverage" ); |
|
667 |
|
668 GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage )); |
|
669 |
|
670 if ( KERN_IS_NEW( valid ) ) |
|
671 { |
|
672 if ( gxv_kern_coverage_new_apple_validate( coverage, |
|
673 format, |
|
674 valid ) ) |
|
675 { |
|
676 result = KERN_DIALECT_APPLE; |
|
677 goto Exit; |
|
678 } |
|
679 } |
|
680 |
|
681 if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_APPLE( valid ) ) |
|
682 { |
|
683 if ( gxv_kern_coverage_classic_apple_validate( coverage, |
|
684 format, |
|
685 valid ) ) |
|
686 { |
|
687 result = KERN_DIALECT_APPLE; |
|
688 goto Exit; |
|
689 } |
|
690 } |
|
691 |
|
692 if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_MS( valid ) ) |
|
693 { |
|
694 if ( gxv_kern_coverage_classic_microsoft_validate( coverage, |
|
695 format, |
|
696 valid ) ) |
|
697 { |
|
698 result = KERN_DIALECT_MS; |
|
699 goto Exit; |
|
700 } |
|
701 } |
|
702 |
|
703 GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" )); |
|
704 |
|
705 Exit: |
|
706 GXV_EXIT; |
|
707 return result; |
|
708 } |
|
709 |
|
710 |
|
711 static void |
|
712 gxv_kern_subtable_validate( FT_Bytes table, |
|
713 FT_Bytes limit, |
|
714 GXV_Validator valid ) |
|
715 { |
|
716 FT_Bytes p = table; |
|
717 FT_UShort version = 0; /* MS only: subtable version, unused */ |
|
718 FT_ULong length; /* MS: 16bit, Apple: 32bit*/ |
|
719 FT_UShort coverage; |
|
720 FT_UShort tupleIndex = 0; /* Apple only */ |
|
721 FT_UShort u16[2]; |
|
722 FT_UShort format = 255; /* subtable format */ |
|
723 |
|
724 |
|
725 GXV_NAME_ENTER( "kern subtable" ); |
|
726 |
|
727 GXV_LIMIT_CHECK( 2 + 2 + 2 ); |
|
728 u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */ |
|
729 u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */ |
|
730 coverage = FT_NEXT_USHORT( p ); |
|
731 |
|
732 switch ( gxv_kern_coverage_validate( coverage, &format, valid ) ) |
|
733 { |
|
734 case KERN_DIALECT_MS: |
|
735 version = u16[0]; |
|
736 length = u16[1]; |
|
737 tupleIndex = 0; |
|
738 GXV_TRACE(( "Subtable version = %d\n", version )); |
|
739 GXV_TRACE(( "Subtable length = %d\n", length )); |
|
740 break; |
|
741 |
|
742 case KERN_DIALECT_APPLE: |
|
743 version = 0; |
|
744 length = ( u16[0] << 16 ) + u16[1]; |
|
745 tupleIndex = 0; |
|
746 GXV_TRACE(( "Subtable length = %d\n", length )); |
|
747 |
|
748 if ( KERN_IS_NEW( valid ) ) |
|
749 { |
|
750 GXV_LIMIT_CHECK( 2 ); |
|
751 tupleIndex = FT_NEXT_USHORT( p ); |
|
752 GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex )); |
|
753 } |
|
754 break; |
|
755 |
|
756 default: |
|
757 length = u16[1]; |
|
758 GXV_TRACE(( "cannot detect subtable dialect, " |
|
759 "just skip %d byte\n", length )); |
|
760 goto Exit; |
|
761 } |
|
762 |
|
763 /* formats 1, 2, 3 require the position of the start of this subtable */ |
|
764 if ( format == 0 ) |
|
765 gxv_kern_subtable_fmt0_validate( table, table + length, valid ); |
|
766 else if ( format == 1 ) |
|
767 gxv_kern_subtable_fmt1_validate( table, table + length, valid ); |
|
768 else if ( format == 2 ) |
|
769 gxv_kern_subtable_fmt2_validate( table, table + length, valid ); |
|
770 else if ( format == 3 ) |
|
771 gxv_kern_subtable_fmt3_validate( table, table + length, valid ); |
|
772 else |
|
773 FT_INVALID_DATA; |
|
774 |
|
775 Exit: |
|
776 valid->subtable_length = length; |
|
777 GXV_EXIT; |
|
778 } |
|
779 |
|
780 |
|
781 /*************************************************************************/ |
|
782 /*************************************************************************/ |
|
783 /***** *****/ |
|
784 /***** kern TABLE *****/ |
|
785 /***** *****/ |
|
786 /*************************************************************************/ |
|
787 /*************************************************************************/ |
|
788 |
|
789 static void |
|
790 gxv_kern_validate_generic( FT_Bytes table, |
|
791 FT_Face face, |
|
792 FT_Bool classic_only, |
|
793 GXV_kern_Dialect dialect_request, |
|
794 FT_Validator ftvalid ) |
|
795 { |
|
796 GXV_ValidatorRec validrec; |
|
797 GXV_Validator valid = &validrec; |
|
798 |
|
799 GXV_kern_DataRec kernrec; |
|
800 GXV_kern_Data kern = &kernrec; |
|
801 |
|
802 FT_Bytes p = table; |
|
803 FT_Bytes limit = 0; |
|
804 |
|
805 FT_ULong nTables = 0; |
|
806 FT_UInt i; |
|
807 |
|
808 |
|
809 valid->root = ftvalid; |
|
810 valid->table_data = kern; |
|
811 valid->face = face; |
|
812 |
|
813 FT_TRACE3(( "validating `kern' table\n" )); |
|
814 GXV_INIT; |
|
815 KERN_DIALECT( valid ) = dialect_request; |
|
816 |
|
817 GXV_LIMIT_CHECK( 2 ); |
|
818 GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p ); |
|
819 GXV_TRACE(( "version 0x%04x (higher 16bit)\n", |
|
820 GXV_KERN_DATA( version ) )); |
|
821 |
|
822 if ( 0x0001 < GXV_KERN_DATA( version ) ) |
|
823 FT_INVALID_FORMAT; |
|
824 else if ( KERN_IS_CLASSIC( valid ) ) |
|
825 { |
|
826 GXV_LIMIT_CHECK( 2 ); |
|
827 nTables = FT_NEXT_USHORT( p ); |
|
828 } |
|
829 else if ( KERN_IS_NEW( valid ) ) |
|
830 { |
|
831 if ( classic_only ) |
|
832 FT_INVALID_FORMAT; |
|
833 |
|
834 if ( 0x0000 != FT_NEXT_USHORT( p ) ) |
|
835 FT_INVALID_FORMAT; |
|
836 |
|
837 GXV_LIMIT_CHECK( 4 ); |
|
838 nTables = FT_NEXT_ULONG( p ); |
|
839 } |
|
840 |
|
841 for ( i = 0; i < nTables; i++ ) |
|
842 { |
|
843 GXV_TRACE(( "validating subtable %d/%d\n", i, nTables )); |
|
844 /* p should be 32bit-aligned? */ |
|
845 gxv_kern_subtable_validate( p, 0, valid ); |
|
846 p += valid->subtable_length; |
|
847 } |
|
848 |
|
849 FT_TRACE4(( "\n" )); |
|
850 } |
|
851 |
|
852 |
|
853 FT_LOCAL_DEF( void ) |
|
854 gxv_kern_validate( FT_Bytes table, |
|
855 FT_Face face, |
|
856 FT_Validator ftvalid ) |
|
857 { |
|
858 gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid ); |
|
859 } |
|
860 |
|
861 |
|
862 FT_LOCAL_DEF( void ) |
|
863 gxv_kern_validate_classic( FT_Bytes table, |
|
864 FT_Face face, |
|
865 FT_Int dialect_flags, |
|
866 FT_Validator ftvalid ) |
|
867 { |
|
868 GXV_kern_Dialect dialect_request; |
|
869 |
|
870 |
|
871 dialect_request = (GXV_kern_Dialect)dialect_flags; |
|
872 gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid ); |
|
873 } |
|
874 |
|
875 |
|
876 /* END */ |
|