1 /***************************************************************************/ |
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2 /* */ |
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3 /* gxvlcar.c */ |
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4 /* */ |
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5 /* TrueTypeGX/AAT lcar 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_gxvlcar |
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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_lcar_DataRec_ |
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50 { |
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51 FT_UShort format; |
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52 |
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53 } GXV_lcar_DataRec, *GXV_lcar_Data; |
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54 |
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55 |
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56 #define GXV_LCAR_DATA( FIELD ) GXV_TABLE_DATA( lcar, FIELD ) |
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57 |
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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 /***** UTILITY FUNCTIONS *****/ |
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63 /***** *****/ |
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64 /*************************************************************************/ |
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65 /*************************************************************************/ |
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66 |
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67 static void |
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68 gxv_lcar_partial_validate( FT_UShort partial, |
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69 FT_UShort glyph, |
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70 GXV_Validator valid ) |
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71 { |
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72 GXV_NAME_ENTER( "partial" ); |
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73 |
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74 if ( GXV_LCAR_DATA( format ) != 1 ) |
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75 goto Exit; |
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76 |
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77 gxv_ctlPoint_validate( glyph, partial, valid ); |
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78 |
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79 Exit: |
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80 GXV_EXIT; |
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81 } |
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82 |
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83 |
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84 static void |
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85 gxv_lcar_LookupValue_validate( FT_UShort glyph, |
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86 GXV_LookupValueCPtr value_p, |
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87 GXV_Validator valid ) |
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88 { |
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89 FT_Bytes p = valid->root->base + value_p->u; |
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90 FT_Bytes limit = valid->root->limit; |
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91 FT_UShort count; |
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92 FT_Short partial; |
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93 FT_UShort i; |
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94 |
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95 |
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96 GXV_NAME_ENTER( "element in lookupTable" ); |
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97 |
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98 GXV_LIMIT_CHECK( 2 ); |
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99 count = FT_NEXT_USHORT( p ); |
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100 |
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101 GXV_LIMIT_CHECK( 2 * count ); |
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102 for ( i = 0; i < count; i++ ) |
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103 { |
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104 partial = FT_NEXT_SHORT( p ); |
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105 gxv_lcar_partial_validate( partial, glyph, valid ); |
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106 } |
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107 |
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108 GXV_EXIT; |
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109 } |
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110 |
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111 |
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112 /* |
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113 +------ lcar --------------------+ |
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114 | | |
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115 | +===============+ | |
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116 | | looup header | | |
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117 | +===============+ | |
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118 | | BinSrchHeader | | |
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119 | +===============+ | |
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120 | | lastGlyph[0] | | |
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121 | +---------------+ | |
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122 | | firstGlyph[0] | | head of lcar sfnt table |
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123 | +---------------+ | + |
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124 | | offset[0] | -> | offset [byte] |
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125 | +===============+ | + |
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126 | | lastGlyph[1] | | (glyphID - firstGlyph) * 2 [byte] |
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127 | +---------------+ | |
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128 | | firstGlyph[1] | | |
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129 | +---------------+ | |
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130 | | offset[1] | | |
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131 | +===============+ | |
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132 | | |
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133 | .... | |
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134 | | |
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135 | 16bit value array | |
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136 | +===============+ | |
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137 +------| value | <-------+ |
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138 | .... |
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139 | |
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140 | |
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141 | |
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142 | |
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143 | |
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144 +----> lcar values...handled by lcar callback function |
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145 */ |
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146 |
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147 static GXV_LookupValueDesc |
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148 gxv_lcar_LookupFmt4_transit( FT_UShort relative_gindex, |
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149 GXV_LookupValueCPtr base_value_p, |
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150 FT_Bytes lookuptbl_limit, |
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151 GXV_Validator valid ) |
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152 { |
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153 FT_Bytes p; |
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154 FT_Bytes limit; |
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155 FT_UShort offset; |
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156 GXV_LookupValueDesc value; |
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157 |
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158 FT_UNUSED( lookuptbl_limit ); |
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159 |
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160 /* XXX: check range? */ |
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161 offset = (FT_UShort)( base_value_p->u + |
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162 relative_gindex * sizeof ( FT_UShort ) ); |
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163 p = valid->root->base + offset; |
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164 limit = valid->root->limit; |
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165 |
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166 GXV_LIMIT_CHECK ( 2 ); |
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167 value.u = FT_NEXT_USHORT( p ); |
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168 |
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169 return value; |
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170 } |
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171 |
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172 |
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173 /*************************************************************************/ |
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174 /*************************************************************************/ |
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175 /***** *****/ |
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176 /***** lcar TABLE *****/ |
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177 /***** *****/ |
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178 /*************************************************************************/ |
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179 /*************************************************************************/ |
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180 |
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181 FT_LOCAL_DEF( void ) |
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182 gxv_lcar_validate( FT_Bytes table, |
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183 FT_Face face, |
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184 FT_Validator ftvalid ) |
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185 { |
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186 FT_Bytes p = table; |
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187 FT_Bytes limit = 0; |
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188 GXV_ValidatorRec validrec; |
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189 GXV_Validator valid = &validrec; |
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190 |
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191 GXV_lcar_DataRec lcarrec; |
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192 GXV_lcar_Data lcar = &lcarrec; |
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193 |
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194 FT_Fixed version; |
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195 |
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196 |
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197 valid->root = ftvalid; |
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198 valid->table_data = lcar; |
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199 valid->face = face; |
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200 |
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201 FT_TRACE3(( "validating `lcar' table\n" )); |
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202 GXV_INIT; |
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203 |
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204 GXV_LIMIT_CHECK( 4 + 2 ); |
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205 version = FT_NEXT_ULONG( p ); |
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206 GXV_LCAR_DATA( format ) = FT_NEXT_USHORT( p ); |
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207 |
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208 if ( version != 0x00010000UL) |
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209 FT_INVALID_FORMAT; |
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210 |
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211 if ( GXV_LCAR_DATA( format ) > 1 ) |
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212 FT_INVALID_FORMAT; |
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213 |
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214 valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
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215 valid->lookupval_func = gxv_lcar_LookupValue_validate; |
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216 valid->lookupfmt4_trans = gxv_lcar_LookupFmt4_transit; |
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217 gxv_LookupTable_validate( p, limit, valid ); |
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218 |
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219 FT_TRACE4(( "\n" )); |
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220 } |
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221 |
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222 |
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223 /* END */ |
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