Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* otvjstf.c */ |
| 4 | /* */ |
| 5 | /* OpenType JSTF table validation (body). */ |
| 6 | /* */ |
| 7 | /* Copyright 2004 by */ |
| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
| 9 | /* */ |
| 10 | /* This file is part of the FreeType project, and may only be used, */ |
| 11 | /* modified, and distributed under the terms of the FreeType project */ |
| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
| 13 | /* this file you indicate that you have read the license and */ |
| 14 | /* understand and accept it fully. */ |
| 15 | /* */ |
| 16 | /***************************************************************************/ |
| 17 | |
| 18 | |
| 19 | #include "otvalid.h" |
| 20 | #include "otvcommn.h" |
| 21 | #include "otvgpos.h" |
| 22 | |
| 23 | |
| 24 | /*************************************************************************/ |
| 25 | /* */ |
| 26 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| 27 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| 28 | /* messages during execution. */ |
| 29 | /* */ |
| 30 | #undef FT_COMPONENT |
| 31 | #define FT_COMPONENT trace_otvjstf |
| 32 | |
| 33 | |
David Turner | c562162 | 2005-06-30 11:46:46 +0000 | [diff] [blame] | 34 | #define JstfPriorityFunc otv_JstfPriority_validate |
| 35 | #define JstfLookupFunc otv_GPOS_subtable_validate |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 36 | |
| 37 | /* uses valid->extra1 (GSUB lookup count) */ |
| 38 | /* uses valid->extra2 (GPOS lookup count) */ |
| 39 | /* sets valid->extra1 (counter) */ |
| 40 | |
| 41 | static void |
| 42 | otv_JstfPriority_validate( FT_Bytes table, |
| 43 | OTV_Validator valid ) |
| 44 | { |
| 45 | FT_Bytes p = table; |
| 46 | FT_UInt table_size; |
| 47 | FT_UInt gsub_lookup_count, gpos_lookup_count; |
| 48 | |
| 49 | OTV_OPTIONAL_TABLE( ShrinkageEnableGSUB ); |
| 50 | OTV_OPTIONAL_TABLE( ShrinkageDisableGSUB ); |
| 51 | OTV_OPTIONAL_TABLE( ShrinkageEnableGPOS ); |
| 52 | OTV_OPTIONAL_TABLE( ShrinkageDisableGPOS ); |
| 53 | OTV_OPTIONAL_TABLE( ExtensionEnableGSUB ); |
| 54 | OTV_OPTIONAL_TABLE( ExtensionDisableGSUB ); |
| 55 | OTV_OPTIONAL_TABLE( ExtensionEnableGPOS ); |
| 56 | OTV_OPTIONAL_TABLE( ExtensionDisableGPOS ); |
| 57 | OTV_OPTIONAL_TABLE( ShrinkageJstfMax ); |
| 58 | OTV_OPTIONAL_TABLE( ExtensionJstfMax ); |
| 59 | |
| 60 | |
| 61 | OTV_ENTER; |
| 62 | OTV_TRACE(( "JstfPriority table\n" )); |
| 63 | |
| 64 | OTV_LIMIT_CHECK( 20 ); |
| 65 | |
| 66 | gsub_lookup_count = valid->extra1; |
| 67 | gpos_lookup_count = valid->extra2; |
| 68 | |
| 69 | table_size = 20; |
| 70 | |
| 71 | valid->extra1 = gsub_lookup_count; |
David Turner | c562162 | 2005-06-30 11:46:46 +0000 | [diff] [blame] | 72 | |
Werner Lemberg | ee95b6f | 2004-09-10 14:39:00 +0000 | [diff] [blame] | 73 | OTV_OPTIONAL_OFFSET( ShrinkageEnableGSUB ); |
| 74 | OTV_SIZE_CHECK( ShrinkageEnableGSUB ); |
| 75 | if ( ShrinkageEnableGSUB ) |
| 76 | otv_x_ux( table + ShrinkageEnableGSUB, valid ); |
| 77 | |
| 78 | OTV_OPTIONAL_OFFSET( ShrinkageDisableGSUB ); |
| 79 | OTV_SIZE_CHECK( ShrinkageDisableGSUB ); |
| 80 | if ( ShrinkageDisableGSUB ) |
| 81 | otv_x_ux( table + ShrinkageDisableGSUB, valid ); |
| 82 | |
| 83 | valid->extra1 = gpos_lookup_count; |
| 84 | |
| 85 | OTV_OPTIONAL_OFFSET( ShrinkageEnableGPOS ); |
| 86 | OTV_SIZE_CHECK( ShrinkageEnableGPOS ); |
| 87 | if ( ShrinkageEnableGPOS ) |
| 88 | otv_x_ux( table + ShrinkageEnableGPOS, valid ); |
| 89 | |
| 90 | OTV_OPTIONAL_OFFSET( ShrinkageDisableGPOS ); |
| 91 | OTV_SIZE_CHECK( ShrinkageDisableGPOS ); |
| 92 | if ( ShrinkageDisableGPOS ) |
| 93 | otv_x_ux( table + ShrinkageDisableGPOS, valid ); |
| 94 | |
| 95 | OTV_OPTIONAL_OFFSET( ShrinkageJstfMax ); |
| 96 | OTV_SIZE_CHECK( ShrinkageJstfMax ); |
| 97 | if ( ShrinkageJstfMax ) |
| 98 | { |
| 99 | /* XXX: check lookup types? */ |
| 100 | OTV_NEST2( JstfMax, JstfLookup ); |
| 101 | OTV_RUN( table + ShrinkageJstfMax, valid ); |
| 102 | } |
| 103 | |
| 104 | valid->extra1 = gsub_lookup_count; |
| 105 | |
| 106 | OTV_OPTIONAL_OFFSET( ExtensionEnableGSUB ); |
| 107 | OTV_SIZE_CHECK( ExtensionEnableGSUB ); |
| 108 | if ( ExtensionEnableGSUB ) |
| 109 | otv_x_ux( table + ExtensionEnableGSUB, valid ); |
| 110 | |
| 111 | OTV_OPTIONAL_OFFSET( ExtensionDisableGSUB ); |
| 112 | OTV_SIZE_CHECK( ExtensionDisableGSUB ); |
| 113 | if ( ExtensionDisableGSUB ) |
| 114 | otv_x_ux( table + ExtensionDisableGSUB, valid ); |
| 115 | |
| 116 | valid->extra1 = gpos_lookup_count; |
| 117 | |
| 118 | OTV_OPTIONAL_OFFSET( ExtensionEnableGPOS ); |
| 119 | OTV_SIZE_CHECK( ExtensionEnableGPOS ); |
| 120 | if ( ExtensionEnableGPOS ) |
| 121 | otv_x_ux( table + ExtensionEnableGPOS, valid ); |
| 122 | |
| 123 | OTV_OPTIONAL_OFFSET( ExtensionDisableGPOS ); |
| 124 | OTV_SIZE_CHECK( ExtensionDisableGPOS ); |
| 125 | if ( ExtensionDisableGPOS ) |
| 126 | otv_x_ux( table + ExtensionDisableGPOS, valid ); |
| 127 | |
| 128 | OTV_OPTIONAL_OFFSET( ExtensionJstfMax ); |
| 129 | OTV_SIZE_CHECK( ExtensionJstfMax ); |
| 130 | if ( ExtensionJstfMax ) |
| 131 | { |
| 132 | /* XXX: check lookup types? */ |
| 133 | OTV_NEST2( JstfMax, JstfLookup ); |
| 134 | OTV_RUN( table + ExtensionJstfMax, valid ); |
| 135 | } |
| 136 | |
| 137 | valid->extra1 = gsub_lookup_count; |
| 138 | valid->extra2 = gpos_lookup_count; |
| 139 | |
| 140 | OTV_EXIT; |
| 141 | } |
| 142 | |
| 143 | |
| 144 | /* sets valid->extra (glyph count) */ |
| 145 | /* sets valid->func1 (otv_JstfPriority_validate) */ |
| 146 | |
| 147 | static void |
| 148 | otv_JstfScript_validate( FT_Bytes table, |
| 149 | OTV_Validator valid ) |
| 150 | { |
| 151 | FT_Bytes p = table; |
| 152 | FT_UInt table_size; |
| 153 | FT_UInt JstfLangSysCount; |
| 154 | |
| 155 | OTV_OPTIONAL_TABLE( ExtGlyph ); |
| 156 | OTV_OPTIONAL_TABLE( DefJstfLangSys ); |
| 157 | |
| 158 | |
| 159 | OTV_NAME_ENTER( "JstfScript" ); |
| 160 | |
| 161 | OTV_LIMIT_CHECK( 6 ); |
| 162 | OTV_OPTIONAL_OFFSET( ExtGlyph ); |
| 163 | OTV_OPTIONAL_OFFSET( DefJstfLangSys ); |
| 164 | JstfLangSysCount = FT_NEXT_USHORT( p ); |
| 165 | |
| 166 | OTV_TRACE(( " (JstfLangSysCount = %d)\n", JstfLangSysCount )); |
| 167 | |
| 168 | table_size = JstfLangSysCount * 6 + 6; |
| 169 | |
| 170 | OTV_SIZE_CHECK( ExtGlyph ); |
| 171 | if ( ExtGlyph ) |
| 172 | { |
| 173 | valid->extra1 = valid->glyph_count; |
| 174 | OTV_NEST1( ExtenderGlyph ); |
| 175 | OTV_RUN( table + ExtGlyph, valid ); |
| 176 | } |
| 177 | |
| 178 | OTV_SIZE_CHECK( DefJstfLangSys ); |
| 179 | if ( DefJstfLangSys ) |
| 180 | { |
| 181 | OTV_NEST2( JstfLangSys, JstfPriority ); |
| 182 | OTV_RUN( table + DefJstfLangSys, valid ); |
| 183 | } |
| 184 | |
| 185 | OTV_LIMIT_CHECK( 6 * JstfLangSysCount ); |
| 186 | |
| 187 | /* JstfLangSysRecord */ |
| 188 | OTV_NEST2( JstfLangSys, JstfPriority ); |
| 189 | for ( ; JstfLangSysCount > 0; JstfLangSysCount-- ) |
| 190 | { |
| 191 | p += 4; /* skip JstfLangSysTag */ |
| 192 | |
| 193 | OTV_RUN( table + FT_NEXT_USHORT( p ), valid ); |
| 194 | } |
| 195 | |
| 196 | OTV_EXIT; |
| 197 | } |
| 198 | |
| 199 | |
| 200 | /* sets valid->extra1 (GSUB lookup count) */ |
| 201 | /* sets valid->extra2 (GPOS lookup count) */ |
| 202 | /* sets valid->glyph_count */ |
| 203 | |
| 204 | FT_LOCAL_DEF( void ) |
| 205 | otv_JSTF_validate( FT_Bytes table, |
| 206 | FT_Bytes gsub, |
| 207 | FT_Bytes gpos, |
| 208 | FT_UInt glyph_count, |
| 209 | FT_Validator ftvalid ) |
| 210 | { |
| 211 | OTV_ValidatorRec validrec; |
| 212 | OTV_Validator valid = &validrec; |
| 213 | FT_Bytes p = table; |
| 214 | FT_UInt JstfScriptCount; |
| 215 | |
| 216 | |
| 217 | valid->root = ftvalid; |
| 218 | |
| 219 | FT_TRACE3(( "validating JSTF table\n" )); |
| 220 | OTV_INIT; |
| 221 | |
| 222 | OTV_LIMIT_CHECK( 6 ); |
| 223 | |
| 224 | if ( FT_NEXT_ULONG( p ) != 0x10000UL ) /* Version */ |
| 225 | FT_INVALID_DATA; |
| 226 | |
| 227 | JstfScriptCount = FT_NEXT_USHORT( p ); |
| 228 | |
| 229 | FT_TRACE3(( " (JstfScriptCount = %d)\n", JstfScriptCount )); |
| 230 | |
| 231 | OTV_LIMIT_CHECK( JstfScriptCount * 6 ); |
| 232 | |
| 233 | if ( gsub ) |
| 234 | valid->extra1 = otv_GSUBGPOS_get_Lookup_count( gsub ); |
| 235 | else |
| 236 | valid->extra1 = 0; |
| 237 | |
| 238 | if ( gpos ) |
| 239 | valid->extra2 = otv_GSUBGPOS_get_Lookup_count( gpos ); |
| 240 | else |
| 241 | valid->extra2 = 0; |
| 242 | |
| 243 | valid->glyph_count = glyph_count; |
| 244 | |
| 245 | /* JstfScriptRecord */ |
| 246 | for ( ; JstfScriptCount > 0; JstfScriptCount-- ) |
| 247 | { |
| 248 | p += 4; /* skip JstfScriptTag */ |
| 249 | |
| 250 | /* JstfScript */ |
| 251 | otv_JstfScript_validate( table + FT_NEXT_USHORT( p ), valid ); |
| 252 | } |
| 253 | |
| 254 | FT_TRACE4(( "\n" )); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | /* END */ |