1 /***************************************************************************/ |
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2 /* */ |
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3 /* ttbdf.c */ |
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4 /* */ |
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5 /* TrueType and OpenType embedded BDF properties (body). */ |
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6 /* */ |
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7 /* Copyright 2005, 2006, 2010 by */ |
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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 #include <ft2build.h> |
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20 #include FT_INTERNAL_DEBUG_H |
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21 #include FT_INTERNAL_STREAM_H |
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22 #include FT_TRUETYPE_TAGS_H |
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23 #include "ttbdf.h" |
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24 |
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25 #include "sferrors.h" |
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26 |
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27 |
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28 #ifdef TT_CONFIG_OPTION_BDF |
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29 |
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30 /*************************************************************************/ |
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31 /* */ |
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32 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
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33 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
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34 /* messages during execution. */ |
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35 /* */ |
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36 #undef FT_COMPONENT |
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37 #define FT_COMPONENT trace_ttbdf |
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38 |
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39 |
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40 FT_LOCAL_DEF( void ) |
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41 tt_face_free_bdf_props( TT_Face face ) |
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42 { |
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43 TT_BDF bdf = &face->bdf; |
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44 |
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45 |
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46 if ( bdf->loaded ) |
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47 { |
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48 FT_Stream stream = FT_FACE(face)->stream; |
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49 |
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50 |
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51 if ( bdf->table != NULL ) |
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52 FT_FRAME_RELEASE( bdf->table ); |
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53 |
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54 bdf->table_end = NULL; |
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55 bdf->strings = NULL; |
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56 bdf->strings_size = 0; |
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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 static FT_Error |
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62 tt_face_load_bdf_props( TT_Face face, |
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63 FT_Stream stream ) |
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64 { |
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65 TT_BDF bdf = &face->bdf; |
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66 FT_ULong length; |
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67 FT_Error error; |
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68 |
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69 |
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70 FT_ZERO( bdf ); |
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71 |
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72 error = tt_face_goto_table( face, TTAG_BDF, stream, &length ); |
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73 if ( error || |
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74 length < 8 || |
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75 FT_FRAME_EXTRACT( length, bdf->table ) ) |
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76 { |
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77 error = SFNT_Err_Invalid_Table; |
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78 goto Exit; |
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79 } |
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80 |
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81 bdf->table_end = bdf->table + length; |
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82 |
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83 { |
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84 FT_Byte* p = bdf->table; |
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85 FT_UInt version = FT_NEXT_USHORT( p ); |
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86 FT_UInt num_strikes = FT_NEXT_USHORT( p ); |
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87 FT_ULong strings = FT_NEXT_ULONG ( p ); |
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88 FT_UInt count; |
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89 FT_Byte* strike; |
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90 |
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91 |
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92 if ( version != 0x0001 || |
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93 strings < 8 || |
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94 ( strings - 8 ) / 4 < num_strikes || |
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95 strings + 1 > length ) |
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96 { |
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97 goto BadTable; |
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98 } |
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99 |
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100 bdf->num_strikes = num_strikes; |
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101 bdf->strings = bdf->table + strings; |
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102 bdf->strings_size = length - strings; |
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103 |
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104 count = bdf->num_strikes; |
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105 p = bdf->table + 8; |
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106 strike = p + count * 4; |
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107 |
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108 |
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109 for ( ; count > 0; count-- ) |
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110 { |
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111 FT_UInt num_items = FT_PEEK_USHORT( p + 2 ); |
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112 |
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113 /* |
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114 * We don't need to check the value sets themselves, since this |
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115 * is done later. |
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116 */ |
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117 strike += 10 * num_items; |
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118 |
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119 p += 4; |
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120 } |
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121 |
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122 if ( strike > bdf->strings ) |
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123 goto BadTable; |
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124 } |
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125 |
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126 bdf->loaded = 1; |
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127 |
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128 Exit: |
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129 return error; |
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130 |
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131 BadTable: |
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132 FT_FRAME_RELEASE( bdf->table ); |
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133 FT_ZERO( bdf ); |
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134 error = SFNT_Err_Invalid_Table; |
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135 goto Exit; |
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136 } |
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137 |
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138 |
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139 FT_LOCAL_DEF( FT_Error ) |
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140 tt_face_find_bdf_prop( TT_Face face, |
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141 const char* property_name, |
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142 BDF_PropertyRec *aprop ) |
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143 { |
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144 TT_BDF bdf = &face->bdf; |
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145 FT_Size size = FT_FACE(face)->size; |
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146 FT_Error error = SFNT_Err_Ok; |
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147 FT_Byte* p; |
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148 FT_UInt count; |
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149 FT_Byte* strike; |
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150 FT_Offset property_len; |
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151 |
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152 |
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153 aprop->type = BDF_PROPERTY_TYPE_NONE; |
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154 |
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155 if ( bdf->loaded == 0 ) |
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156 { |
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157 error = tt_face_load_bdf_props( face, FT_FACE( face )->stream ); |
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158 if ( error ) |
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159 goto Exit; |
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160 } |
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161 |
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162 count = bdf->num_strikes; |
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163 p = bdf->table + 8; |
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164 strike = p + 4 * count; |
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165 |
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166 error = SFNT_Err_Invalid_Argument; |
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167 |
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168 if ( size == NULL || property_name == NULL ) |
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169 goto Exit; |
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170 |
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171 property_len = ft_strlen( property_name ); |
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172 if ( property_len == 0 ) |
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173 goto Exit; |
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174 |
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175 for ( ; count > 0; count-- ) |
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176 { |
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177 FT_UInt _ppem = FT_NEXT_USHORT( p ); |
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178 FT_UInt _count = FT_NEXT_USHORT( p ); |
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179 |
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180 if ( _ppem == size->metrics.y_ppem ) |
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181 { |
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182 count = _count; |
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183 goto FoundStrike; |
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184 } |
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185 |
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186 strike += 10 * _count; |
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187 } |
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188 goto Exit; |
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189 |
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190 FoundStrike: |
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191 p = strike; |
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192 for ( ; count > 0; count-- ) |
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193 { |
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194 FT_UInt type = FT_PEEK_USHORT( p + 4 ); |
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195 |
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196 if ( ( type & 0x10 ) != 0 ) |
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197 { |
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198 FT_UInt32 name_offset = FT_PEEK_ULONG( p ); |
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199 FT_UInt32 value = FT_PEEK_ULONG( p + 6 ); |
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200 |
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201 /* be a bit paranoid for invalid entries here */ |
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202 if ( name_offset < bdf->strings_size && |
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203 property_len < bdf->strings_size - name_offset && |
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204 ft_strncmp( property_name, |
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205 (const char*)bdf->strings + name_offset, |
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206 bdf->strings_size - name_offset ) == 0 ) |
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207 { |
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208 switch ( type & 0x0F ) |
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209 { |
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210 case 0x00: /* string */ |
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211 case 0x01: /* atoms */ |
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212 /* check that the content is really 0-terminated */ |
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213 if ( value < bdf->strings_size && |
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214 ft_memchr( bdf->strings + value, 0, bdf->strings_size ) ) |
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215 { |
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216 aprop->type = BDF_PROPERTY_TYPE_ATOM; |
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217 aprop->u.atom = (const char*)bdf->strings + value; |
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218 error = SFNT_Err_Ok; |
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219 goto Exit; |
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220 } |
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221 break; |
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222 |
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223 case 0x02: |
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224 aprop->type = BDF_PROPERTY_TYPE_INTEGER; |
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225 aprop->u.integer = (FT_Int32)value; |
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226 error = SFNT_Err_Ok; |
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227 goto Exit; |
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228 |
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229 case 0x03: |
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230 aprop->type = BDF_PROPERTY_TYPE_CARDINAL; |
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231 aprop->u.cardinal = value; |
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232 error = SFNT_Err_Ok; |
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233 goto Exit; |
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234 |
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235 default: |
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236 ; |
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237 } |
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238 } |
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239 } |
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240 p += 10; |
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241 } |
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242 |
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243 Exit: |
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244 return error; |
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245 } |
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246 |
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247 #endif /* TT_CONFIG_OPTION_BDF */ |
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248 |
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249 |
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250 /* END */ |
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