1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvmorx.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT morx table validation (body). */ |
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6 /* */ |
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7 /* Copyright 2005, 2008 by */ |
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8 /* 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 "gxvmorx.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_gxvmorx |
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39 |
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40 |
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41 static void |
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42 gxv_morx_subtables_validate( FT_Bytes table, |
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43 FT_Bytes limit, |
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44 FT_UShort nSubtables, |
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45 GXV_Validator valid ) |
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46 { |
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47 FT_Bytes p = table; |
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48 |
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49 GXV_Validate_Func fmt_funcs_table[] = |
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50 { |
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51 gxv_morx_subtable_type0_validate, /* 0 */ |
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52 gxv_morx_subtable_type1_validate, /* 1 */ |
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53 gxv_morx_subtable_type2_validate, /* 2 */ |
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54 NULL, /* 3 */ |
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55 gxv_morx_subtable_type4_validate, /* 4 */ |
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56 gxv_morx_subtable_type5_validate, /* 5 */ |
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57 |
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58 }; |
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59 |
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60 GXV_Validate_Func func; |
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61 |
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62 FT_UShort i; |
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63 |
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64 |
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65 GXV_NAME_ENTER( "subtables in a chain" ); |
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66 |
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67 for ( i = 0; i < nSubtables; i++ ) |
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68 { |
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69 FT_ULong length; |
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70 FT_ULong coverage; |
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71 FT_ULong subFeatureFlags; |
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72 FT_ULong type; |
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73 FT_ULong rest; |
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74 |
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75 |
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76 GXV_LIMIT_CHECK( 4 + 4 + 4 ); |
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77 length = FT_NEXT_ULONG( p ); |
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78 coverage = FT_NEXT_ULONG( p ); |
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79 subFeatureFlags = FT_NEXT_ULONG( p ); |
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80 |
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81 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n", |
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82 i + 1, nSubtables, length )); |
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83 |
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84 type = coverage & 0x0007; |
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85 rest = length - ( 4 + 4 + 4 ); |
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86 GXV_LIMIT_CHECK( rest ); |
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87 |
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88 /* morx coverage consists of mort_coverage & 16bit padding */ |
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89 gxv_mort_coverage_validate( (FT_UShort)( ( coverage >> 16 ) | coverage ), |
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90 valid ); |
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91 if ( type > 5 ) |
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92 FT_INVALID_FORMAT; |
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93 |
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94 func = fmt_funcs_table[type]; |
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95 if ( func == NULL ) |
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96 GXV_TRACE(( "morx type %d is reserved\n", type )); |
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97 |
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98 func( p, p + rest, valid ); |
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99 |
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100 p += rest; |
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101 } |
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102 |
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103 valid->subtable_length = p - table; |
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104 |
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105 GXV_EXIT; |
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106 } |
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107 |
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108 |
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109 static void |
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110 gxv_morx_chain_validate( FT_Bytes table, |
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111 FT_Bytes limit, |
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112 GXV_Validator valid ) |
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113 { |
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114 FT_Bytes p = table; |
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115 FT_ULong defaultFlags; |
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116 FT_ULong chainLength; |
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117 FT_ULong nFeatureFlags; |
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118 FT_ULong nSubtables; |
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119 |
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120 |
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121 GXV_NAME_ENTER( "morx chain header" ); |
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122 |
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123 GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 ); |
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124 defaultFlags = FT_NEXT_ULONG( p ); |
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125 chainLength = FT_NEXT_ULONG( p ); |
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126 nFeatureFlags = FT_NEXT_ULONG( p ); |
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127 nSubtables = FT_NEXT_ULONG( p ); |
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128 |
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129 /* feature-array of morx is same with that of mort */ |
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130 gxv_mort_featurearray_validate( p, limit, nFeatureFlags, valid ); |
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131 p += valid->subtable_length; |
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132 |
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133 if ( nSubtables >= 0x10000L ) |
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134 FT_INVALID_DATA; |
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135 |
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136 gxv_morx_subtables_validate( p, table + chainLength, |
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137 (FT_UShort)nSubtables, valid ); |
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138 |
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139 valid->subtable_length = chainLength; |
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140 |
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141 GXV_EXIT; |
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142 } |
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143 |
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144 |
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145 FT_LOCAL_DEF( void ) |
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146 gxv_morx_validate( FT_Bytes table, |
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147 FT_Face face, |
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148 FT_Validator ftvalid ) |
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149 { |
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150 GXV_ValidatorRec validrec; |
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151 GXV_Validator valid = &validrec; |
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152 FT_Bytes p = table; |
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153 FT_Bytes limit = 0; |
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154 FT_ULong version; |
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155 FT_ULong nChains; |
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156 FT_ULong i; |
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157 |
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158 |
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159 valid->root = ftvalid; |
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160 valid->face = face; |
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161 |
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162 FT_TRACE3(( "validating `morx' table\n" )); |
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163 GXV_INIT; |
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164 |
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165 GXV_LIMIT_CHECK( 4 + 4 ); |
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166 version = FT_NEXT_ULONG( p ); |
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167 nChains = FT_NEXT_ULONG( p ); |
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168 |
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169 if ( version != 0x00020000UL ) |
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170 FT_INVALID_FORMAT; |
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171 |
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172 for ( i = 0; i < nChains; i++ ) |
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173 { |
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174 GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains )); |
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175 GXV_32BIT_ALIGNMENT_VALIDATE( p - table ); |
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176 gxv_morx_chain_validate( p, limit, valid ); |
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177 p += valid->subtable_length; |
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178 } |
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179 |
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180 FT_TRACE4(( "\n" )); |
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181 } |
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182 |
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183 |
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184 /* END */ |
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