Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 1 | /***************************************************************************/ |
| 2 | /* */ |
| 3 | /* gxvopbd.c */ |
| 4 | /* */ |
| 5 | /* TrueTypeGX/AAT opbd 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 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 18 | /***************************************************************************/ |
| 19 | /* */ |
| 20 | /* gxvalid is derived from both gxlayout module and otvalid module. */ |
| 21 | /* Development of gxlayout is supported by the Information-technology */ |
| 22 | /* Promotion Agency(IPA), Japan. */ |
| 23 | /* */ |
| 24 | /***************************************************************************/ |
| 25 | |
| 26 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 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_gxvopbd |
| 39 | |
| 40 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 41 | /*************************************************************************/ |
| 42 | /*************************************************************************/ |
| 43 | /***** *****/ |
| 44 | /***** Data and Types *****/ |
| 45 | /***** *****/ |
| 46 | /*************************************************************************/ |
| 47 | /*************************************************************************/ |
| 48 | |
| 49 | typedef struct GXV_opbd_DataRec_ |
| 50 | { |
| 51 | FT_UShort format; |
| 52 | FT_UShort valueOffset_min; |
| 53 | |
| 54 | } GXV_opbd_DataRec, *GXV_opbd_Data; |
| 55 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 56 | |
| 57 | #define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD ) |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 58 | |
| 59 | |
| 60 | /*************************************************************************/ |
| 61 | /*************************************************************************/ |
| 62 | /***** *****/ |
| 63 | /***** UTILITY FUNCTIONS *****/ |
| 64 | /***** *****/ |
| 65 | /*************************************************************************/ |
| 66 | /*************************************************************************/ |
| 67 | |
| 68 | static void |
| 69 | gxv_opbd_LookupValue_validate( FT_UShort glyph, |
| 70 | GXV_LookupValueDesc value, |
| 71 | GXV_Validator valid ) |
| 72 | { |
| 73 | /* offset in LookupTable is measured from the head of opbd table */ |
| 74 | FT_Bytes p = valid->root->base + value.u; |
| 75 | FT_Bytes limit = valid->root->limit; |
| 76 | FT_Short delta_value; |
| 77 | int i; |
| 78 | |
| 79 | |
| 80 | if ( value.u < GXV_OPBD_DATA( valueOffset_min ) ) |
| 81 | GXV_OPBD_DATA( valueOffset_min ) = value.u; |
| 82 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 83 | for ( i = 0; i < 4; i++ ) |
| 84 | { |
| 85 | GXV_LIMIT_CHECK( 2 ); |
| 86 | delta_value = FT_NEXT_SHORT( p ); |
| 87 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 88 | if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 89 | { |
| 90 | if ( delta_value == -1 ) |
| 91 | continue; |
| 92 | |
| 93 | gxv_ctlPoint_validate( glyph, delta_value, valid ); |
| 94 | } |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 95 | else /* format 0, value is distance */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 96 | continue; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | |
| 101 | /* |
| 102 | opbd ---------------------+ |
| 103 | | |
| 104 | +===============+ | |
| 105 | | lookup header | | |
| 106 | +===============+ | |
| 107 | | BinSrchHeader | | |
| 108 | +===============+ | |
| 109 | | lastGlyph[0] | | |
| 110 | +---------------+ | |
| 111 | | firstGlyph[0] | | head of opbd sfnt table |
| 112 | +---------------+ | + |
| 113 | | offset[0] | -> | offset [byte] |
| 114 | +===============+ | + |
| 115 | | lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte] |
| 116 | +---------------+ | |
| 117 | | firstGlyph[1] | | |
| 118 | +---------------+ | |
| 119 | | offset[1] | | |
| 120 | +===============+ | |
| 121 | | |
| 122 | .... | |
| 123 | | |
| 124 | 48bit value array | |
| 125 | +===============+ | |
| 126 | | value | <-------+ |
| 127 | | | |
| 128 | | | |
| 129 | | | |
| 130 | +---------------+ |
| 131 | .... */ |
| 132 | |
| 133 | static GXV_LookupValueDesc |
| 134 | gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex, |
| 135 | GXV_LookupValueDesc base_value, |
| 136 | FT_Bytes lookuptbl_limit, |
| 137 | GXV_Validator valid ) |
| 138 | { |
| 139 | GXV_LookupValueDesc value; |
| 140 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 141 | FT_UNUSED( lookuptbl_limit ); |
| 142 | FT_UNUSED( valid ); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 143 | |
Werner Lemberg | 7c25946 | 2005-09-28 07:34:45 +0000 | [diff] [blame] | 144 | /* XXX: check range? */ |
| 145 | value.u = (FT_UShort)( base_value.u + |
| 146 | relative_gindex * 4 * sizeof ( FT_Short ) ); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 147 | |
| 148 | return value; |
| 149 | } |
| 150 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 151 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 152 | /*************************************************************************/ |
| 153 | /*************************************************************************/ |
| 154 | /***** *****/ |
| 155 | /***** opbd TABLE *****/ |
| 156 | /***** *****/ |
| 157 | /*************************************************************************/ |
| 158 | /*************************************************************************/ |
| 159 | |
| 160 | FT_LOCAL_DEF( void ) |
| 161 | gxv_opbd_validate( FT_Bytes table, |
| 162 | FT_Face face, |
| 163 | FT_Validator ftvalid ) |
| 164 | { |
| 165 | GXV_ValidatorRec validrec; |
| 166 | GXV_Validator valid = &validrec; |
| 167 | GXV_opbd_DataRec opbdrec; |
| 168 | GXV_opbd_Data opbd = &opbdrec; |
| 169 | FT_Bytes p = table; |
| 170 | FT_Bytes limit = 0; |
| 171 | |
| 172 | FT_ULong version; |
| 173 | |
| 174 | |
| 175 | valid->root = ftvalid; |
| 176 | valid->table_data = opbd; |
| 177 | valid->face = face; |
| 178 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 179 | FT_TRACE3(( "validating `opbd' table\n" )); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 180 | GXV_INIT; |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 181 | GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU; |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 182 | |
| 183 | |
| 184 | GXV_LIMIT_CHECK( 4 + 2 ); |
| 185 | version = FT_NEXT_ULONG( p ); |
| 186 | GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p ); |
| 187 | |
| 188 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 189 | /* only 0x00010000 is defined (1996) */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 190 | GXV_TRACE(( "(version=0x%08x)\n", version )); |
| 191 | if ( 0x00010000UL != version ) |
| 192 | FT_INVALID_FORMAT; |
| 193 | |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 194 | /* only values 0 and 1 are defined (1996) */ |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 195 | GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) )); |
| 196 | if ( 0x0001 < GXV_OPBD_DATA( format ) ) |
| 197 | FT_INVALID_FORMAT; |
| 198 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 199 | valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
| 200 | valid->lookupval_func = gxv_opbd_LookupValue_validate; |
| 201 | valid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit; |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 202 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 203 | gxv_LookupTable_validate( p, limit, valid ); |
| 204 | p += valid->subtable_length; |
| 205 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 206 | if ( p > table + GXV_OPBD_DATA( valueOffset_min ) ) |
| 207 | { |
Werner Lemberg | 99aa14c | 2005-09-05 19:31:27 +0000 | [diff] [blame] | 208 | GXV_TRACE(( |
| 209 | "found overlap between LookupTable and opbd_value array\n" )); |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 210 | FT_INVALID_OFFSET; |
| 211 | } |
| 212 | |
Suzuki, Toshiya (鈴木俊哉) | a438621 | 2005-08-24 04:31:31 +0000 | [diff] [blame] | 213 | FT_TRACE4(( "\n" )); |
| 214 | } |
| 215 | |
| 216 | |
| 217 | /* END */ |