1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvmort2.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT mort table validation */ |
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6 /* body for type2 (Ligature Substitution) subtable. */ |
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7 /* */ |
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8 /* Copyright 2005 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 "gxvmort.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_gxvmort |
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39 |
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40 |
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41 typedef struct GXV_mort_subtable_type2_StateOptRec_ |
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42 { |
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43 FT_UShort ligActionTable; |
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44 FT_UShort componentTable; |
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45 FT_UShort ligatureTable; |
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46 FT_UShort ligActionTable_length; |
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47 FT_UShort componentTable_length; |
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48 FT_UShort ligatureTable_length; |
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49 |
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50 } GXV_mort_subtable_type2_StateOptRec, |
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51 *GXV_mort_subtable_type2_StateOptRecData; |
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52 |
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53 #define GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE \ |
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54 ( GXV_STATETABLE_HEADER_SIZE + 2 + 2 + 2 ) |
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55 |
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56 |
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57 static void |
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58 gxv_mort_subtable_type2_opttable_load( FT_Bytes table, |
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59 FT_Bytes limit, |
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60 GXV_Validator valid ) |
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61 { |
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62 FT_Bytes p = table; |
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63 GXV_mort_subtable_type2_StateOptRecData optdata = |
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64 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; |
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65 |
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66 |
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67 GXV_LIMIT_CHECK( 2 + 2 + 2 ); |
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68 optdata->ligActionTable = FT_NEXT_USHORT( p ); |
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69 optdata->componentTable = FT_NEXT_USHORT( p ); |
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70 optdata->ligatureTable = FT_NEXT_USHORT( p ); |
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71 |
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72 GXV_TRACE(( "offset to ligActionTable=0x%04x\n", |
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73 optdata->ligActionTable )); |
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74 GXV_TRACE(( "offset to componentTable=0x%04x\n", |
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75 optdata->componentTable )); |
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76 GXV_TRACE(( "offset to ligatureTable=0x%04x\n", |
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77 optdata->ligatureTable )); |
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78 } |
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79 |
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80 |
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81 static void |
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82 gxv_mort_subtable_type2_subtable_setup( FT_UShort table_size, |
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83 FT_UShort classTable, |
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84 FT_UShort stateArray, |
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85 FT_UShort entryTable, |
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86 FT_UShort *classTable_length_p, |
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87 FT_UShort *stateArray_length_p, |
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88 FT_UShort *entryTable_length_p, |
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89 GXV_Validator valid ) |
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90 { |
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91 FT_UShort o[6]; |
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92 FT_UShort *l[6]; |
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93 FT_UShort buff[7]; |
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94 |
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95 GXV_mort_subtable_type2_StateOptRecData optdata = |
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96 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; |
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97 |
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98 |
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99 GXV_NAME_ENTER( "subtable boundaries setup" ); |
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100 |
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101 o[0] = classTable; |
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102 o[1] = stateArray; |
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103 o[2] = entryTable; |
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104 o[3] = optdata->ligActionTable; |
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105 o[4] = optdata->componentTable; |
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106 o[5] = optdata->ligatureTable; |
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107 l[0] = classTable_length_p; |
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108 l[1] = stateArray_length_p; |
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109 l[2] = entryTable_length_p; |
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110 l[3] = &(optdata->ligActionTable_length); |
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111 l[4] = &(optdata->componentTable_length); |
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112 l[5] = &(optdata->ligatureTable_length); |
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113 |
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114 gxv_set_length_by_ushort_offset( o, l, buff, 6, table_size, valid ); |
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115 |
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116 GXV_TRACE(( "classTable: offset=0x%04x length=0x%04x\n", |
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117 classTable, *classTable_length_p )); |
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118 GXV_TRACE(( "stateArray: offset=0x%04x length=0x%04x\n", |
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119 stateArray, *stateArray_length_p )); |
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120 GXV_TRACE(( "entryTable: offset=0x%04x length=0x%04x\n", |
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121 entryTable, *entryTable_length_p )); |
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122 GXV_TRACE(( "ligActionTable: offset=0x%04x length=0x%04x\n", |
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123 optdata->ligActionTable, |
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124 optdata->ligActionTable_length )); |
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125 GXV_TRACE(( "componentTable: offset=0x%04x length=0x%04x\n", |
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126 optdata->componentTable, |
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127 optdata->componentTable_length )); |
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128 GXV_TRACE(( "ligatureTable: offset=0x%04x length=0x%04x\n", |
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129 optdata->ligatureTable, |
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130 optdata->ligatureTable_length )); |
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131 |
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132 GXV_EXIT; |
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133 } |
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134 |
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135 |
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136 static void |
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137 gxv_mort_subtable_type2_ligActionOffset_validate( |
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138 FT_Bytes table, |
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139 FT_UShort ligActionOffset, |
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140 GXV_Validator valid ) |
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141 { |
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142 /* access ligActionTable */ |
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143 GXV_mort_subtable_type2_StateOptRecData optdata = |
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144 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; |
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145 |
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146 FT_Bytes lat_base = table + optdata->ligActionTable; |
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147 FT_Bytes p = table + ligActionOffset; |
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148 FT_Bytes lat_limit = lat_base + optdata->ligActionTable; |
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149 |
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150 |
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151 GXV_32BIT_ALIGNMENT_VALIDATE( ligActionOffset ); |
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152 if ( p < lat_base ) |
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153 { |
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154 GXV_TRACE(( "too short offset 0x%04x: p < lat_base (%d byte rewind)\n", |
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155 ligActionOffset, lat_base - p )); |
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156 |
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157 /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ |
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158 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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159 FT_INVALID_OFFSET; |
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160 } |
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161 else if ( lat_limit < p ) |
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162 { |
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163 GXV_TRACE(( "too large offset 0x%04x: lat_limit < p (%d byte overrun)\n", |
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164 ligActionOffset, p - lat_limit )); |
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165 |
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166 /* FontValidator, ftxvalidator, ftxdumperfuser warn but continue */ |
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167 if ( valid->root->level >= FT_VALIDATE_PARANOID ) |
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168 FT_INVALID_OFFSET; |
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169 } |
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170 else |
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171 { |
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172 /* validate entry in ligActionTable */ |
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173 FT_ULong lig_action; |
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174 FT_UShort last; |
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175 FT_UShort store; |
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176 FT_ULong offset; |
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177 |
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178 |
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179 lig_action = FT_NEXT_ULONG( p ); |
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180 last = (FT_UShort)( ( lig_action >> 31 ) & 1 ); |
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181 store = (FT_UShort)( ( lig_action >> 30 ) & 1 ); |
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182 |
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183 offset = lig_action & 0x3FFFFFFFUL; |
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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 static void |
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189 gxv_mort_subtable_type2_entry_validate( |
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190 FT_Byte state, |
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191 FT_UShort flags, |
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192 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
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193 FT_Bytes table, |
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194 FT_Bytes limit, |
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195 GXV_Validator valid ) |
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196 { |
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197 FT_UShort setComponent; |
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198 FT_UShort dontAdvance; |
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199 FT_UShort offset; |
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200 |
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201 FT_UNUSED( state ); |
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202 FT_UNUSED( glyphOffset_p ); |
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203 FT_UNUSED( limit ); |
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204 |
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205 |
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206 setComponent = (FT_UShort)( ( flags >> 15 ) & 1 ); |
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207 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
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208 |
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209 offset = (FT_UShort)( flags & 0x3FFFU ); |
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210 |
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211 if ( 0 < offset ) |
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212 gxv_mort_subtable_type2_ligActionOffset_validate( table, offset, |
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213 valid ); |
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214 } |
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215 |
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216 |
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217 static void |
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218 gxv_mort_subtable_type2_ligatureTable_validate( FT_Bytes table, |
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219 GXV_Validator valid ) |
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220 { |
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221 GXV_mort_subtable_type2_StateOptRecData optdata = |
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222 (GXV_mort_subtable_type2_StateOptRecData)valid->statetable.optdata; |
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223 |
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224 FT_Bytes p = table + optdata->ligatureTable; |
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225 FT_Bytes limit = table + optdata->ligatureTable |
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226 + optdata->ligatureTable_length; |
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227 |
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228 |
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229 GXV_NAME_ENTER( "mort chain subtable type2 - substitutionTable" ); |
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230 if ( 0 != optdata->ligatureTable ) |
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231 { |
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232 /* Apple does not give specification of ligatureTable format */ |
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233 while ( p < limit ) |
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234 { |
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235 FT_UShort lig_gid; |
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236 |
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237 |
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238 GXV_LIMIT_CHECK( 2 ); |
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239 lig_gid = FT_NEXT_USHORT( p ); |
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240 } |
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241 } |
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242 GXV_EXIT; |
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243 } |
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244 |
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245 |
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246 FT_LOCAL_DEF( void ) |
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247 gxv_mort_subtable_type2_validate( FT_Bytes table, |
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248 FT_Bytes limit, |
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249 GXV_Validator valid ) |
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250 { |
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251 FT_Bytes p = table; |
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252 |
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253 GXV_mort_subtable_type2_StateOptRec lig_rec; |
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254 |
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255 |
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256 GXV_NAME_ENTER( "mort chain subtable type2 (Ligature Substitution)" ); |
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257 |
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258 GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE2_HEADER_SIZE ); |
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259 |
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260 valid->statetable.optdata = |
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261 &lig_rec; |
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262 valid->statetable.optdata_load_func = |
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263 gxv_mort_subtable_type2_opttable_load; |
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264 valid->statetable.subtable_setup_func = |
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265 gxv_mort_subtable_type2_subtable_setup; |
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266 valid->statetable.entry_glyphoffset_fmt = |
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267 GXV_GLYPHOFFSET_NONE; |
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268 valid->statetable.entry_validate_func = |
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269 gxv_mort_subtable_type2_entry_validate; |
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270 |
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271 gxv_StateTable_validate( p, limit, valid ); |
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272 |
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273 p += valid->subtable_length; |
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274 gxv_mort_subtable_type2_ligatureTable_validate( table, valid ); |
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275 |
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276 valid->subtable_length = p - table; |
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277 |
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278 GXV_EXIT; |
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279 } |
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280 |
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281 |
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282 /* END */ |
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