1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvtrak.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT trak table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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9 /* */ |
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10 /* This file is part of the FreeType project, and may only be used, */ |
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11 /* modified, and distributed under the terms of the FreeType project */ |
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12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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13 /* this file you indicate that you have read the license and */ |
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14 /* understand and accept it fully. */ |
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15 /* */ |
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16 /***************************************************************************/ |
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17 |
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18 /***************************************************************************/ |
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19 /* */ |
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20 /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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21 /* Development of gxlayout is supported by the Information-technology */ |
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22 /* Promotion Agency(IPA), Japan. */ |
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23 /* */ |
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24 /***************************************************************************/ |
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25 |
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26 |
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27 #include "gxvalid.h" |
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28 #include "gxvcommn.h" |
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29 |
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30 |
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31 /*************************************************************************/ |
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32 /* */ |
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33 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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34 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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35 /* messages during execution. */ |
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36 /* */ |
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37 #undef FT_COMPONENT |
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38 #define FT_COMPONENT trace_gxvtrak |
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39 |
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40 |
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41 /*************************************************************************/ |
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42 /*************************************************************************/ |
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43 /***** *****/ |
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44 /***** Data and Types *****/ |
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45 /***** *****/ |
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46 /*************************************************************************/ |
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47 /*************************************************************************/ |
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48 |
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49 /* |
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50 * referred track table format specification: |
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51 * http://developer.apple.com/fonts/TTRefMan/RM06/Chap6trak.html |
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52 * last update was 1996. |
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53 * ---------------------------------------------- |
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54 * [MINIMUM HEADER]: GXV_TRAK_SIZE_MIN |
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55 * version (fixed: 32bit) = 0x00010000 |
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56 * format (uint16: 16bit) = 0 is only defined (1996) |
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57 * horizOffset (uint16: 16bit) |
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58 * vertOffset (uint16: 16bit) |
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59 * reserved (uint16: 16bit) = 0 |
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60 * ---------------------------------------------- |
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61 * [VARIABLE BODY]: |
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62 * horizData |
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63 * header ( 2 + 2 + 4 |
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64 * trackTable + nTracks * ( 4 + 2 + 2 ) |
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65 * sizeTable + nSizes * 4 ) |
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66 * ---------------------------------------------- |
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67 * vertData |
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68 * header ( 2 + 2 + 4 |
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69 * trackTable + nTracks * ( 4 + 2 + 2 ) |
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70 * sizeTable + nSizes * 4 ) |
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71 * ---------------------------------------------- |
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72 */ |
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73 typedef struct GXV_trak_DataRec_ |
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74 { |
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75 FT_UShort trackValueOffset_min; |
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76 FT_UShort trackValueOffset_max; |
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77 |
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78 } GXV_trak_DataRec, *GXV_trak_Data; |
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79 |
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80 |
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81 #define GXV_TRAK_DATA( FIELD ) GXV_TABLE_DATA( trak, FIELD ) |
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82 |
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83 |
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84 /*************************************************************************/ |
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85 /*************************************************************************/ |
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86 /***** *****/ |
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87 /***** UTILITY FUNCTIONS *****/ |
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88 /***** *****/ |
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89 /*************************************************************************/ |
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90 /*************************************************************************/ |
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91 |
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92 static void |
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93 gxv_trak_trackTable_validate( FT_Bytes table, |
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94 FT_Bytes limit, |
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95 FT_UShort nTracks, |
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96 GXV_Validator valid ) |
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97 { |
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98 FT_Bytes p = table; |
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99 |
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100 FT_Fixed track; |
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101 FT_UShort nameIndex; |
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102 FT_UShort offset; |
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103 FT_UShort i; |
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104 |
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105 |
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106 GXV_NAME_ENTER( "trackTable" ); |
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107 |
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108 GXV_TRAK_DATA( trackValueOffset_min ) = 0xFFFFU; |
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109 GXV_TRAK_DATA( trackValueOffset_max ) = 0x0000; |
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110 |
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111 for ( i = 0; i < nTracks; i ++ ) |
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112 { |
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113 GXV_LIMIT_CHECK( 4 + 2 + 2 ); |
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114 track = FT_NEXT_LONG( p ); |
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115 nameIndex = FT_NEXT_USHORT( p ); |
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116 offset = FT_NEXT_USHORT( p ); |
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117 |
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118 if ( offset < GXV_TRAK_DATA( trackValueOffset_min ) ) |
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119 GXV_TRAK_DATA( trackValueOffset_min ) = offset; |
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120 if ( offset > GXV_TRAK_DATA( trackValueOffset_max ) ) |
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121 GXV_TRAK_DATA( trackValueOffset_max ) = offset; |
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122 |
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123 gxv_sfntName_validate( nameIndex, 256, 32767, valid ); |
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124 } |
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125 |
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126 valid->subtable_length = p - table; |
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127 GXV_EXIT; |
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128 } |
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129 |
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130 |
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131 static void |
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132 gxv_trak_trackData_validate( FT_Bytes table, |
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133 FT_Bytes limit, |
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134 GXV_Validator valid ) |
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135 { |
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136 FT_Bytes p = table; |
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137 FT_UShort nTracks; |
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138 FT_UShort nSizes; |
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139 FT_ULong sizeTableOffset; |
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140 |
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141 GXV_ODTECT( 4, odtect ); |
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142 |
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143 |
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144 GXV_ODTECT_INIT( odtect ); |
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145 GXV_NAME_ENTER( "trackData" ); |
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146 |
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147 /* read the header of trackData */ |
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148 GXV_LIMIT_CHECK( 2 + 2 + 4 ); |
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149 nTracks = FT_NEXT_USHORT( p ); |
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150 nSizes = FT_NEXT_USHORT( p ); |
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151 sizeTableOffset = FT_NEXT_ULONG( p ); |
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152 |
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153 gxv_odtect_add_range( table, p - table, "trackData header", odtect ); |
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154 |
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155 /* validate trackTable */ |
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156 gxv_trak_trackTable_validate( p, limit, nTracks, valid ); |
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157 gxv_odtect_add_range( p, valid->subtable_length, |
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158 "trackTable", odtect ); |
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159 |
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160 /* sizeTable is array of FT_Fixed, don't check contents */ |
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161 p = valid->root->base + sizeTableOffset; |
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162 GXV_LIMIT_CHECK( nSizes * 4 ); |
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163 gxv_odtect_add_range( p, nSizes * 4, "sizeTable", odtect ); |
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164 |
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165 /* validate trackValueOffet */ |
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166 p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_min ); |
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167 if ( limit - p < nTracks * nSizes * 2 ) |
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168 GXV_TRACE(( "too short trackValue array\n" )); |
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169 |
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170 p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_max ); |
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171 GXV_LIMIT_CHECK( nSizes * 2 ); |
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172 |
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173 gxv_odtect_add_range( valid->root->base |
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174 + GXV_TRAK_DATA( trackValueOffset_min ), |
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175 GXV_TRAK_DATA( trackValueOffset_max ) |
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176 - GXV_TRAK_DATA( trackValueOffset_min ) |
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177 + nSizes * 2, |
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178 "trackValue array", odtect ); |
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179 |
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180 gxv_odtect_validate( odtect, valid ); |
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181 |
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182 GXV_EXIT; |
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183 } |
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184 |
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185 |
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186 /*************************************************************************/ |
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187 /*************************************************************************/ |
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188 /***** *****/ |
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189 /***** trak TABLE *****/ |
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190 /***** *****/ |
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191 /*************************************************************************/ |
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192 /*************************************************************************/ |
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193 |
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194 FT_LOCAL_DEF( void ) |
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195 gxv_trak_validate( FT_Bytes table, |
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196 FT_Face face, |
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197 FT_Validator ftvalid ) |
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198 { |
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199 FT_Bytes p = table; |
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200 FT_Bytes limit = 0; |
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201 FT_Offset table_size; |
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202 |
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203 GXV_ValidatorRec validrec; |
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204 GXV_Validator valid = &validrec; |
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205 GXV_trak_DataRec trakrec; |
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206 GXV_trak_Data trak = &trakrec; |
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207 |
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208 FT_ULong version; |
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209 FT_UShort format; |
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210 FT_UShort horizOffset; |
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211 FT_UShort vertOffset; |
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212 FT_UShort reserved; |
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213 |
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214 |
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215 GXV_ODTECT( 3, odtect ); |
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216 |
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217 GXV_ODTECT_INIT( odtect ); |
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218 valid->root = ftvalid; |
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219 valid->table_data = trak; |
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220 valid->face = face; |
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221 |
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222 limit = valid->root->limit; |
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223 table_size = limit - table; |
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224 |
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225 FT_TRACE3(( "validating `trak' table\n" )); |
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226 GXV_INIT; |
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227 |
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228 GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 ); |
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229 version = FT_NEXT_ULONG( p ); |
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230 format = FT_NEXT_USHORT( p ); |
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231 horizOffset = FT_NEXT_USHORT( p ); |
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232 vertOffset = FT_NEXT_USHORT( p ); |
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233 reserved = FT_NEXT_USHORT( p ); |
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234 |
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235 GXV_TRACE(( " (version = 0x%08x)\n", version )); |
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236 GXV_TRACE(( " (format = 0x%04x)\n", format )); |
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237 GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset )); |
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238 GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset )); |
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239 GXV_TRACE(( " (reserved = 0x%04x)\n", reserved )); |
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240 |
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241 /* Version 1.0 (always:1996) */ |
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242 if ( version != 0x00010000UL ) |
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243 FT_INVALID_FORMAT; |
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244 |
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245 /* format 0 (always:1996) */ |
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246 if ( format != 0x0000 ) |
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247 FT_INVALID_FORMAT; |
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248 |
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249 GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset ); |
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250 GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset ); |
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251 |
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252 /* Reserved Fixed Value (always) */ |
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253 if ( reserved != 0x0000 ) |
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254 FT_INVALID_DATA; |
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255 |
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256 /* validate trackData */ |
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257 if ( 0 < horizOffset ) |
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258 { |
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259 gxv_trak_trackData_validate( table + horizOffset, limit, valid ); |
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260 gxv_odtect_add_range( table + horizOffset, valid->subtable_length, |
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261 "horizJustData", odtect ); |
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262 } |
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263 |
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264 if ( 0 < vertOffset ) |
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265 { |
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266 gxv_trak_trackData_validate( table + vertOffset, limit, valid ); |
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267 gxv_odtect_add_range( table + vertOffset, valid->subtable_length, |
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268 "vertJustData", odtect ); |
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269 } |
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270 |
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271 gxv_odtect_validate( odtect, valid ); |
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272 |
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273 FT_TRACE4(( "\n" )); |
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274 } |
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275 |
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276 |
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277 /* END */ |
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