1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvopbd.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT opbd 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_gxvopbd |
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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 typedef struct GXV_opbd_DataRec_ |
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50 { |
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51 FT_UShort format; |
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52 FT_UShort valueOffset_min; |
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53 |
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54 } GXV_opbd_DataRec, *GXV_opbd_Data; |
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55 |
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56 |
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57 #define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD ) |
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58 |
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59 |
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60 /*************************************************************************/ |
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61 /*************************************************************************/ |
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62 /***** *****/ |
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63 /***** UTILITY FUNCTIONS *****/ |
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64 /***** *****/ |
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65 /*************************************************************************/ |
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66 /*************************************************************************/ |
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67 |
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68 static void |
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69 gxv_opbd_LookupValue_validate( FT_UShort glyph, |
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70 GXV_LookupValueCPtr value_p, |
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71 GXV_Validator valid ) |
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72 { |
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73 /* offset in LookupTable is measured from the head of opbd table */ |
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74 FT_Bytes p = valid->root->base + value_p->u; |
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75 FT_Bytes limit = valid->root->limit; |
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76 FT_Short delta_value; |
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77 int i; |
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78 |
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79 |
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80 if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) ) |
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81 GXV_OPBD_DATA( valueOffset_min ) = value_p->u; |
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82 |
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83 for ( i = 0; i < 4; i++ ) |
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84 { |
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85 GXV_LIMIT_CHECK( 2 ); |
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86 delta_value = FT_NEXT_SHORT( p ); |
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87 |
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88 if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */ |
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89 { |
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90 if ( delta_value == -1 ) |
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91 continue; |
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92 |
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93 gxv_ctlPoint_validate( glyph, delta_value, valid ); |
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94 } |
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95 else /* format 0, value is distance */ |
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96 continue; |
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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 /* |
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102 opbd ---------------------+ |
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103 | |
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104 +===============+ | |
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105 | lookup header | | |
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106 +===============+ | |
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107 | BinSrchHeader | | |
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108 +===============+ | |
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109 | lastGlyph[0] | | |
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110 +---------------+ | |
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111 | firstGlyph[0] | | head of opbd sfnt table |
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112 +---------------+ | + |
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113 | offset[0] | -> | offset [byte] |
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114 +===============+ | + |
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115 | lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte] |
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116 +---------------+ | |
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117 | firstGlyph[1] | | |
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118 +---------------+ | |
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119 | offset[1] | | |
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120 +===============+ | |
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121 | |
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122 .... | |
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123 | |
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124 48bit value array | |
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125 +===============+ | |
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126 | value | <-------+ |
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127 | | |
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128 | | |
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129 | | |
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130 +---------------+ |
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131 .... */ |
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132 |
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133 static GXV_LookupValueDesc |
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134 gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex, |
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135 GXV_LookupValueCPtr base_value_p, |
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136 FT_Bytes lookuptbl_limit, |
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137 GXV_Validator valid ) |
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138 { |
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139 GXV_LookupValueDesc value; |
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140 |
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141 FT_UNUSED( lookuptbl_limit ); |
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142 FT_UNUSED( valid ); |
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143 |
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144 /* XXX: check range? */ |
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145 value.u = (FT_UShort)( base_value_p->u + |
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146 relative_gindex * 4 * sizeof ( FT_Short ) ); |
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147 |
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148 return value; |
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149 } |
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150 |
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151 |
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152 /*************************************************************************/ |
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153 /*************************************************************************/ |
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154 /***** *****/ |
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155 /***** opbd TABLE *****/ |
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156 /***** *****/ |
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157 /*************************************************************************/ |
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158 /*************************************************************************/ |
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159 |
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160 FT_LOCAL_DEF( void ) |
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161 gxv_opbd_validate( FT_Bytes table, |
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162 FT_Face face, |
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163 FT_Validator ftvalid ) |
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164 { |
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165 GXV_ValidatorRec validrec; |
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166 GXV_Validator valid = &validrec; |
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167 GXV_opbd_DataRec opbdrec; |
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168 GXV_opbd_Data opbd = &opbdrec; |
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169 FT_Bytes p = table; |
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170 FT_Bytes limit = 0; |
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171 |
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172 FT_ULong version; |
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173 |
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174 |
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175 valid->root = ftvalid; |
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176 valid->table_data = opbd; |
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177 valid->face = face; |
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178 |
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179 FT_TRACE3(( "validating `opbd' table\n" )); |
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180 GXV_INIT; |
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181 GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU; |
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182 |
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183 |
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184 GXV_LIMIT_CHECK( 4 + 2 ); |
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185 version = FT_NEXT_ULONG( p ); |
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186 GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p ); |
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187 |
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188 |
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189 /* only 0x00010000 is defined (1996) */ |
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190 GXV_TRACE(( "(version=0x%08x)\n", version )); |
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191 if ( 0x00010000UL != version ) |
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192 FT_INVALID_FORMAT; |
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193 |
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194 /* only values 0 and 1 are defined (1996) */ |
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195 GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) )); |
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196 if ( 0x0001 < GXV_OPBD_DATA( format ) ) |
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197 FT_INVALID_FORMAT; |
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198 |
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199 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
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200 valid->lookupval_func = gxv_opbd_LookupValue_validate; |
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201 valid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit; |
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202 |
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203 gxv_LookupTable_validate( p, limit, valid ); |
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204 p += valid->subtable_length; |
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205 |
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206 if ( p > table + GXV_OPBD_DATA( valueOffset_min ) ) |
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207 { |
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208 GXV_TRACE(( |
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209 "found overlap between LookupTable and opbd_value array\n" )); |
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210 FT_INVALID_OFFSET; |
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211 } |
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212 |
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213 FT_TRACE4(( "\n" )); |
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214 } |
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215 |
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216 |
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217 /* END */ |
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