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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /***************************************************************************/ |
| 2 | /* */ |
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| 3 | /* gxvopbd.c */ |
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| 4 | /* */ |
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| 5 | /* TrueTypeGX/AAT opbd 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 | |||
| 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 | |||
| 26 | |||
| 27 | #include "gxvalid.h" |
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| 28 | #include "gxvcommn.h" |
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| 29 | |||
| 30 | |||
| 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_gxvopbd |
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| 39 | |||
| 40 | |||
| 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 | |||
| 49 | typedef struct GXV_opbd_DataRec_ |
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| 50 | { |
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| 51 | FT_UShort format; |
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| 52 | FT_UShort valueOffset_min; |
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| 53 | |||
| 54 | } GXV_opbd_DataRec, *GXV_opbd_Data; |
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| 55 | |||
| 56 | |||
| 57 | #define GXV_OPBD_DATA( FIELD ) GXV_TABLE_DATA( opbd, FIELD ) |
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| 58 | |||
| 59 | |||
| 60 | /*************************************************************************/ |
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| 61 | /*************************************************************************/ |
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| 62 | /***** *****/ |
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| 63 | /***** UTILITY FUNCTIONS *****/ |
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| 64 | /***** *****/ |
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| 65 | /*************************************************************************/ |
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| 66 | /*************************************************************************/ |
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| 67 | |||
| 68 | static void |
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| 69 | gxv_opbd_LookupValue_validate( FT_UShort glyph, |
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| 70 | GXV_LookupValueCPtr value_p, |
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| 71 | GXV_Validator valid ) |
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| 72 | { |
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| 73 | /* offset in LookupTable is measured from the head of opbd table */ |
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| 74 | FT_Bytes p = valid->root->base + value_p->u; |
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| 75 | FT_Bytes limit = valid->root->limit; |
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| 76 | FT_Short delta_value; |
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| 77 | int i; |
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| 78 | |||
| 79 | |||
| 80 | if ( value_p->u < GXV_OPBD_DATA( valueOffset_min ) ) |
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| 81 | GXV_OPBD_DATA( valueOffset_min ) = value_p->u; |
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| 82 | |||
| 83 | for ( i = 0; i < 4; i++ ) |
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| 84 | { |
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| 85 | GXV_LIMIT_CHECK( 2 ); |
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| 86 | delta_value = FT_NEXT_SHORT( p ); |
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| 87 | |||
| 88 | if ( GXV_OPBD_DATA( format ) ) /* format 1, value is ctrl pt. */ |
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| 89 | { |
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| 90 | if ( delta_value == -1 ) |
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| 91 | continue; |
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| 92 | |||
| 93 | gxv_ctlPoint_validate( glyph, delta_value, valid ); |
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| 94 | } |
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| 95 | else /* format 0, value is distance */ |
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| 96 | continue; |
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| 97 | } |
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| 98 | } |
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| 99 | |||
| 100 | |||
| 101 | /* |
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| 102 | opbd ---------------------+ |
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| 103 | | |
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| 104 | +===============+ | |
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| 105 | | lookup header | | |
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| 106 | +===============+ | |
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| 107 | | BinSrchHeader | | |
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| 108 | +===============+ | |
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| 109 | | lastGlyph[0] | | |
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| 110 | +---------------+ | |
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| 111 | | firstGlyph[0] | | head of opbd sfnt table |
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| 112 | +---------------+ | + |
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| 113 | | offset[0] | -> | offset [byte] |
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| 114 | +===============+ | + |
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| 115 | | lastGlyph[1] | | (glyphID - firstGlyph) * 4 * sizeof(FT_Short) [byte] |
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| 116 | +---------------+ | |
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| 117 | | firstGlyph[1] | | |
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| 118 | +---------------+ | |
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| 119 | | offset[1] | | |
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| 120 | +===============+ | |
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| 121 | | |
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| 122 | .... | |
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| 123 | | |
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| 124 | 48bit value array | |
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| 125 | +===============+ | |
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| 126 | | value | <-------+ |
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| 127 | | | |
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| 128 | | | |
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| 129 | | | |
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| 130 | +---------------+ |
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| 131 | .... */ |
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| 132 | |||
| 133 | static GXV_LookupValueDesc |
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| 134 | gxv_opbd_LookupFmt4_transit( FT_UShort relative_gindex, |
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| 135 | GXV_LookupValueCPtr base_value_p, |
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| 136 | FT_Bytes lookuptbl_limit, |
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| 137 | GXV_Validator valid ) |
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| 138 | { |
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| 139 | GXV_LookupValueDesc value; |
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| 140 | |||
| 141 | FT_UNUSED( lookuptbl_limit ); |
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| 142 | FT_UNUSED( valid ); |
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| 143 | |||
| 144 | /* XXX: check range? */ |
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| 145 | value.u = (FT_UShort)( base_value_p->u + |
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| 146 | relative_gindex * 4 * sizeof ( FT_Short ) ); |
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| 147 | |||
| 148 | return value; |
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| 149 | } |
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| 150 | |||
| 151 | |||
| 152 | /*************************************************************************/ |
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| 153 | /*************************************************************************/ |
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| 154 | /***** *****/ |
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| 155 | /***** opbd TABLE *****/ |
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| 156 | /***** *****/ |
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| 157 | /*************************************************************************/ |
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| 158 | /*************************************************************************/ |
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| 159 | |||
| 160 | FT_LOCAL_DEF( void ) |
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| 161 | gxv_opbd_validate( FT_Bytes table, |
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| 162 | FT_Face face, |
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| 163 | FT_Validator ftvalid ) |
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| 164 | { |
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| 165 | GXV_ValidatorRec validrec; |
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| 166 | GXV_Validator valid = &validrec; |
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| 167 | GXV_opbd_DataRec opbdrec; |
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| 168 | GXV_opbd_Data opbd = &opbdrec; |
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| 169 | FT_Bytes p = table; |
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| 170 | FT_Bytes limit = 0; |
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| 171 | |||
| 172 | FT_ULong version; |
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| 173 | |||
| 174 | |||
| 175 | valid->root = ftvalid; |
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| 176 | valid->table_data = opbd; |
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| 177 | valid->face = face; |
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| 178 | |||
| 179 | FT_TRACE3(( "validating `opbd' table\n" )); |
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| 180 | GXV_INIT; |
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| 181 | GXV_OPBD_DATA( valueOffset_min ) = 0xFFFFU; |
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| 182 | |||
| 183 | |||
| 184 | GXV_LIMIT_CHECK( 4 + 2 ); |
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| 185 | version = FT_NEXT_ULONG( p ); |
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| 186 | GXV_OPBD_DATA( format ) = FT_NEXT_USHORT( p ); |
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| 187 | |||
| 188 | |||
| 189 | /* only 0x00010000 is defined (1996) */ |
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| 190 | GXV_TRACE(( "(version=0x%08x)\n", version )); |
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| 191 | if ( 0x00010000UL != version ) |
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| 192 | FT_INVALID_FORMAT; |
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| 193 | |||
| 194 | /* only values 0 and 1 are defined (1996) */ |
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| 195 | GXV_TRACE(( "(format=0x%04x)\n", GXV_OPBD_DATA( format ) )); |
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| 196 | if ( 0x0001 < GXV_OPBD_DATA( format ) ) |
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| 197 | FT_INVALID_FORMAT; |
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| 198 | |||
| 199 | valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
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| 200 | valid->lookupval_func = gxv_opbd_LookupValue_validate; |
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| 201 | valid->lookupfmt4_trans = gxv_opbd_LookupFmt4_transit; |
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| 202 | |||
| 203 | gxv_LookupTable_validate( p, limit, valid ); |
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| 204 | p += valid->subtable_length; |
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| 205 | |||
| 206 | if ( p > table + GXV_OPBD_DATA( valueOffset_min ) ) |
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| 207 | { |
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| 208 | GXV_TRACE(( |
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| 209 | "found overlap between LookupTable and opbd_value array\n" )); |
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| 210 | FT_INVALID_OFFSET; |
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| 211 | } |
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| 212 | |||
| 213 | FT_TRACE4(( "\n" )); |
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| 214 | } |
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| 215 | |||
| 216 | |||
| 217 | /* END */ |