Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* gxvtrak.c */ |
| 4 | /* */ |
| 5 | /* TrueTypeGX/AAT trak table validation (body). */ |
| 6 | /* */ |
| 7 | /* Copyright 2004, 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
| 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 | /***************************************************************************/ |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 19 | /* */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 20 | /* gxvalid is derived from both gxlayout module and otvalid module. */ |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 21 | /* Development of gxlayout is supported by the Information-technology */ |
| 22 | /* Promotion Agency(IPA), Japan. */ |
| 23 | /* */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 24 | /***************************************************************************/ |
| 25 | |
| 26 | |
| 27 | #include "gxvalid.h" |
| 28 | #include "gxvcommn.h" |
| 29 | |
| 30 | |
| 31 | /*************************************************************************/ |
| 32 | /* */ |
| 33 | /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ |
| 34 | /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ |
| 35 | /* messages during execution. */ |
| 36 | /* */ |
| 37 | #undef FT_COMPONENT |
| 38 | #define FT_COMPONENT trace_gxvtrak |
| 39 | |
| 40 | |
| 41 | /*************************************************************************/ |
| 42 | /*************************************************************************/ |
| 43 | /***** *****/ |
| 44 | /***** Data and Types *****/ |
| 45 | /***** *****/ |
| 46 | /*************************************************************************/ |
| 47 | /*************************************************************************/ |
| 48 | |
| 49 | /* |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 50 | * referred track table format specification: |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 51 | * http://developer.apple.com/fonts/TTRefMan/RM06/Chap6trak.html |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 52 | * last update was 1996. |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 53 | * ---------------------------------------------- |
| 54 | * [MINIMUM HEADER]: GXV_TRAK_SIZE_MIN |
| 55 | * version (fixed: 32bit) = 0x00010000 |
| 56 | * format (uint16: 16bit) = 0 is only defined (1996) |
| 57 | * horizOffset (uint16: 16bit) |
| 58 | * vertOffset (uint16: 16bit) |
| 59 | * reserved (uint16: 16bit) = 0 |
| 60 | * ---------------------------------------------- |
| 61 | * [VARIABLE BODY]: |
| 62 | * horizData |
| 63 | * header ( 2 + 2 + 4 |
| 64 | * trackTable + nTracks * ( 4 + 2 + 2 ) |
| 65 | * sizeTable + nSizes * 4 ) |
| 66 | * ---------------------------------------------- |
| 67 | * vertData |
| 68 | * header ( 2 + 2 + 4 |
| 69 | * trackTable + nTracks * ( 4 + 2 + 2 ) |
| 70 | * sizeTable + nSizes * 4 ) |
| 71 | * ---------------------------------------------- |
| 72 | */ |
| 73 | typedef struct GXV_trak_DataRec_ |
| 74 | { |
| 75 | FT_UShort trackValueOffset_min; |
| 76 | FT_UShort trackValueOffset_max; |
| 77 | |
| 78 | } GXV_trak_DataRec, *GXV_trak_Data; |
| 79 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 80 | |
| 81 | #define GXV_TRAK_DATA( FIELD ) GXV_TABLE_DATA( trak, FIELD ) |
| 82 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 83 | |
| 84 | /*************************************************************************/ |
| 85 | /*************************************************************************/ |
| 86 | /***** *****/ |
| 87 | /***** UTILITY FUNCTIONS *****/ |
| 88 | /***** *****/ |
| 89 | /*************************************************************************/ |
| 90 | /*************************************************************************/ |
| 91 | |
| 92 | static void |
| 93 | gxv_trak_trackTable_validate( FT_Bytes table, |
| 94 | FT_Bytes limit, |
| 95 | FT_UShort nTracks, |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 96 | GXV_Validator valid ) |
| 97 | { |
| 98 | FT_Bytes p = table; |
| 99 | |
| 100 | FT_Fixed track; |
| 101 | FT_UShort nameIndex; |
| 102 | FT_UShort offset; |
| 103 | FT_UShort i; |
| 104 | |
| 105 | |
| 106 | GXV_NAME_ENTER( "trackTable" ); |
| 107 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 108 | GXV_TRAK_DATA( trackValueOffset_min ) = 0xFFFFU; |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 109 | GXV_TRAK_DATA( trackValueOffset_max ) = 0x0000; |
| 110 | |
| 111 | for ( i = 0; i < nTracks; i ++ ) |
| 112 | { |
| 113 | GXV_LIMIT_CHECK( 4 + 2 + 2 ); |
| 114 | track = FT_NEXT_LONG( p ); |
| 115 | nameIndex = FT_NEXT_USHORT( p ); |
| 116 | offset = FT_NEXT_USHORT( p ); |
| 117 | |
| 118 | if ( offset < GXV_TRAK_DATA( trackValueOffset_min ) ) |
| 119 | GXV_TRAK_DATA( trackValueOffset_min ) = offset; |
| 120 | if ( offset > GXV_TRAK_DATA( trackValueOffset_max ) ) |
| 121 | GXV_TRAK_DATA( trackValueOffset_max ) = offset; |
| 122 | |
| 123 | gxv_sfntName_validate( nameIndex, 256, 32767, valid ); |
| 124 | } |
| 125 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 126 | valid->subtable_length = p - table; |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 127 | GXV_EXIT; |
| 128 | } |
| 129 | |
| 130 | |
| 131 | static void |
| 132 | gxv_trak_trackData_validate( FT_Bytes table, |
| 133 | FT_Bytes limit, |
| 134 | GXV_Validator valid ) |
| 135 | { |
| 136 | FT_Bytes p = table; |
| 137 | FT_UShort nTracks; |
| 138 | FT_UShort nSizes; |
| 139 | FT_ULong sizeTableOffset; |
| 140 | |
| 141 | GXV_ODTECT( 4, odtect ); |
| 142 | |
| 143 | |
| 144 | GXV_ODTECT_INIT( odtect ); |
| 145 | GXV_NAME_ENTER( "trackData" ); |
| 146 | |
| 147 | /* read the header of trackData */ |
| 148 | GXV_LIMIT_CHECK( 2 + 2 + 4 ); |
| 149 | nTracks = FT_NEXT_USHORT( p ); |
| 150 | nSizes = FT_NEXT_USHORT( p ); |
| 151 | sizeTableOffset = FT_NEXT_ULONG( p ); |
| 152 | |
| 153 | gxv_odtect_add_range( table, p - table, "trackData header", odtect ); |
| 154 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 155 | /* validate trackTable */ |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 156 | gxv_trak_trackTable_validate( p, limit, nTracks, valid ); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 157 | gxv_odtect_add_range( p, valid->subtable_length, |
| 158 | "trackTable", odtect ); |
| 159 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 160 | /* sizeTable is array of FT_Fixed, don't check contents */ |
| 161 | p = valid->root->base + sizeTableOffset; |
| 162 | GXV_LIMIT_CHECK( nSizes * 4 ); |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 163 | gxv_odtect_add_range( p, nSizes * 4, "sizeTable", odtect ); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 164 | |
| 165 | /* validate trackValueOffet */ |
| 166 | p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_min ); |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 167 | if ( limit - p < nTracks * nSizes * 2 ) |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 168 | GXV_TRACE(( "too short trackValue array\n" )); |
| 169 | |
| 170 | p = valid->root->base + GXV_TRAK_DATA( trackValueOffset_max ); |
| 171 | GXV_LIMIT_CHECK( nSizes * 2 ); |
| 172 | |
| 173 | gxv_odtect_add_range( valid->root->base |
| 174 | + GXV_TRAK_DATA( trackValueOffset_min ), |
| 175 | GXV_TRAK_DATA( trackValueOffset_max ) |
| 176 | - GXV_TRAK_DATA( trackValueOffset_min ) |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 177 | + nSizes * 2, |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 178 | "trackValue array", odtect ); |
| 179 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 180 | gxv_odtect_validate( odtect, valid ); |
| 181 | |
| 182 | GXV_EXIT; |
| 183 | } |
| 184 | |
| 185 | |
| 186 | /*************************************************************************/ |
| 187 | /*************************************************************************/ |
| 188 | /***** *****/ |
| 189 | /***** trak TABLE *****/ |
| 190 | /***** *****/ |
| 191 | /*************************************************************************/ |
| 192 | /*************************************************************************/ |
| 193 | |
| 194 | FT_LOCAL_DEF( void ) |
| 195 | gxv_trak_validate( FT_Bytes table, |
| 196 | FT_Face face, |
| 197 | FT_Validator ftvalid ) |
| 198 | { |
| 199 | FT_Bytes p = table; |
| 200 | FT_Bytes limit = 0; |
| 201 | FT_UInt table_size; |
| 202 | |
| 203 | GXV_ValidatorRec validrec; |
| 204 | GXV_Validator valid = &validrec; |
| 205 | GXV_trak_DataRec trakrec; |
| 206 | GXV_trak_Data trak = &trakrec; |
| 207 | |
| 208 | FT_ULong version; |
| 209 | FT_UShort format; |
| 210 | FT_UShort horizOffset; |
| 211 | FT_UShort vertOffset; |
| 212 | FT_UShort reserved; |
| 213 | |
| 214 | |
| 215 | GXV_ODTECT( 3, odtect ); |
| 216 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 217 | GXV_ODTECT_INIT( odtect ); |
| 218 | valid->root = ftvalid; |
| 219 | valid->table_data = trak; |
| 220 | valid->face = face; |
| 221 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 222 | limit = valid->root->limit; |
| 223 | table_size = limit - table; |
| 224 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 225 | FT_TRACE3(( "validating `trak' table\n" )); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 226 | GXV_INIT; |
| 227 | |
| 228 | GXV_LIMIT_CHECK( 4 + 2 + 2 + 2 + 2 ); |
| 229 | version = FT_NEXT_ULONG( p ); |
| 230 | format = FT_NEXT_USHORT( p ); |
| 231 | horizOffset = FT_NEXT_USHORT( p ); |
| 232 | vertOffset = FT_NEXT_USHORT( p ); |
| 233 | reserved = FT_NEXT_USHORT( p ); |
| 234 | |
| 235 | GXV_TRACE(( " (version = 0x%08x)\n", version )); |
| 236 | GXV_TRACE(( " (format = 0x%04x)\n", format )); |
| 237 | GXV_TRACE(( " (horizOffset = 0x%04x)\n", horizOffset )); |
| 238 | GXV_TRACE(( " (vertOffset = 0x%04x)\n", vertOffset )); |
| 239 | GXV_TRACE(( " (reserved = 0x%04x)\n", reserved )); |
| 240 | |
| 241 | /* Version 1.0 (always:1996) */ |
| 242 | if ( version != 0x00010000UL ) |
| 243 | FT_INVALID_FORMAT; |
| 244 | |
| 245 | /* format 0 (always:1996) */ |
| 246 | if ( format != 0x0000 ) |
| 247 | FT_INVALID_FORMAT; |
| 248 | |
| 249 | GXV_32BIT_ALIGNMENT_VALIDATE( horizOffset ); |
| 250 | GXV_32BIT_ALIGNMENT_VALIDATE( vertOffset ); |
| 251 | |
| 252 | /* Reserved Fixed Value (always) */ |
| 253 | if ( reserved != 0x0000 ) |
| 254 | FT_INVALID_DATA; |
| 255 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 256 | /* validate trackData */ |
| 257 | if ( 0 < horizOffset ) |
| 258 | { |
| 259 | gxv_trak_trackData_validate( table + horizOffset, limit, valid ); |
| 260 | gxv_odtect_add_range( table + horizOffset, valid->subtable_length, |
| 261 | "horizJustData", odtect ); |
| 262 | } |
| 263 | |
| 264 | if ( 0 < vertOffset ) |
| 265 | { |
| 266 | gxv_trak_trackData_validate( table + vertOffset, limit, valid ); |
| 267 | gxv_odtect_add_range( table + vertOffset, valid->subtable_length, |
| 268 | "vertJustData", odtect ); |
| 269 | } |
| 270 | |
| 271 | gxv_odtect_validate( odtect, valid ); |
| 272 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 273 | FT_TRACE4(( "\n" )); |
| 274 | } |
| 275 | |
| 276 | |
| 277 | /* END */ |