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| 4349 | Serge | 1 | /***************************************************************************/ |
| 2 | /* */ |
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| 3 | /* gxvmorx1.c */ |
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| 4 | /* */ |
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| 5 | /* TrueTypeGX/AAT morx table validation */ |
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| 6 | /* body for type1 (Contextual Substitution) subtable. */ |
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| 7 | /* */ |
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| 8 | /* Copyright 2005, 2007 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */ |
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| 9 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
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| 10 | /* */ |
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| 11 | /* This file is part of the FreeType project, and may only be used, */ |
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| 12 | /* modified, and distributed under the terms of the FreeType project */ |
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| 13 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
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| 14 | /* this file you indicate that you have read the license and */ |
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| 15 | /* understand and accept it fully. */ |
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| 16 | /* */ |
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| 17 | /***************************************************************************/ |
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| 18 | |||
| 19 | /***************************************************************************/ |
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| 20 | /* */ |
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| 21 | /* gxvalid is derived from both gxlayout module and otvalid module. */ |
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| 22 | /* Development of gxlayout is supported by the Information-technology */ |
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| 23 | /* Promotion Agency(IPA), Japan. */ |
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| 24 | /* */ |
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| 25 | /***************************************************************************/ |
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| 26 | |||
| 27 | |||
| 28 | #include "gxvmorx.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_gxvmorx |
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| 39 | |||
| 40 | |||
| 41 | typedef struct GXV_morx_subtable_type1_StateOptRec_ |
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| 42 | { |
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| 43 | FT_ULong substitutionTable; |
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| 44 | FT_ULong substitutionTable_length; |
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| 45 | FT_UShort substitutionTable_num_lookupTables; |
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| 46 | |||
| 47 | } GXV_morx_subtable_type1_StateOptRec, |
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| 48 | *GXV_morx_subtable_type1_StateOptRecData; |
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| 49 | |||
| 50 | |||
| 51 | #define GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE \ |
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| 52 | ( GXV_STATETABLE_HEADER_SIZE + 2 ) |
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| 53 | |||
| 54 | |||
| 55 | static void |
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| 56 | gxv_morx_subtable_type1_substitutionTable_load( FT_Bytes table, |
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| 57 | FT_Bytes limit, |
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| 58 | GXV_Validator valid ) |
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| 59 | { |
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| 60 | FT_Bytes p = table; |
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| 61 | |||
| 62 | GXV_morx_subtable_type1_StateOptRecData optdata = |
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| 63 | (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; |
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| 64 | |||
| 65 | |||
| 66 | GXV_LIMIT_CHECK( 2 ); |
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| 67 | optdata->substitutionTable = FT_NEXT_USHORT( p ); |
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| 68 | } |
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| 69 | |||
| 70 | |||
| 71 | static void |
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| 72 | gxv_morx_subtable_type1_subtable_setup( FT_ULong table_size, |
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| 73 | FT_ULong classTable, |
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| 74 | FT_ULong stateArray, |
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| 75 | FT_ULong entryTable, |
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| 76 | FT_ULong* classTable_length_p, |
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| 77 | FT_ULong* stateArray_length_p, |
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| 78 | FT_ULong* entryTable_length_p, |
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| 79 | GXV_Validator valid ) |
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| 80 | { |
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| 81 | FT_ULong o[4]; |
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| 82 | FT_ULong *l[4]; |
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| 83 | FT_ULong buff[5]; |
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| 84 | |||
| 85 | GXV_morx_subtable_type1_StateOptRecData optdata = |
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| 86 | (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; |
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| 87 | |||
| 88 | |||
| 89 | o[0] = classTable; |
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| 90 | o[1] = stateArray; |
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| 91 | o[2] = entryTable; |
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| 92 | o[3] = optdata->substitutionTable; |
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| 93 | l[0] = classTable_length_p; |
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| 94 | l[1] = stateArray_length_p; |
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| 95 | l[2] = entryTable_length_p; |
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| 96 | l[3] = &(optdata->substitutionTable_length); |
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| 97 | |||
| 98 | gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid ); |
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| 99 | } |
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| 100 | |||
| 101 | |||
| 102 | static void |
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| 103 | gxv_morx_subtable_type1_entry_validate( |
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| 104 | FT_UShort state, |
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| 105 | FT_UShort flags, |
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| 106 | GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
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| 107 | FT_Bytes table, |
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| 108 | FT_Bytes limit, |
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| 109 | GXV_Validator valid ) |
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| 110 | { |
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| 111 | #ifdef GXV_LOAD_TRACE_VARS |
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| 112 | FT_UShort setMark; |
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| 113 | FT_UShort dontAdvance; |
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| 114 | #endif |
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| 115 | FT_UShort reserved; |
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| 116 | FT_Short markIndex; |
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| 117 | FT_Short currentIndex; |
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| 118 | |||
| 119 | GXV_morx_subtable_type1_StateOptRecData optdata = |
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| 120 | (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; |
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| 121 | |||
| 122 | FT_UNUSED( state ); |
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| 123 | FT_UNUSED( table ); |
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| 124 | FT_UNUSED( limit ); |
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| 125 | |||
| 126 | |||
| 127 | #ifdef GXV_LOAD_TRACE_VARS |
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| 128 | setMark = (FT_UShort)( ( flags >> 15 ) & 1 ); |
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| 129 | dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
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| 130 | #endif |
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| 131 | |||
| 132 | reserved = (FT_UShort)( flags & 0x3FFF ); |
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| 133 | |||
| 134 | markIndex = (FT_Short)( glyphOffset_p->ul >> 16 ); |
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| 135 | currentIndex = (FT_Short)( glyphOffset_p->ul ); |
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| 136 | |||
| 137 | GXV_TRACE(( " setMark=%01d dontAdvance=%01d\n", |
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| 138 | setMark, dontAdvance )); |
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| 139 | |||
| 140 | if ( 0 < reserved ) |
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| 141 | { |
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| 142 | GXV_TRACE(( " non-zero bits found in reserved range\n" )); |
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| 143 | GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); |
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| 144 | } |
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| 145 | |||
| 146 | GXV_TRACE(( "markIndex = %d, currentIndex = %d\n", |
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| 147 | markIndex, currentIndex )); |
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| 148 | |||
| 149 | if ( optdata->substitutionTable_num_lookupTables < markIndex + 1 ) |
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| 150 | optdata->substitutionTable_num_lookupTables = |
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| 151 | (FT_Short)( markIndex + 1 ); |
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| 152 | |||
| 153 | if ( optdata->substitutionTable_num_lookupTables < currentIndex + 1 ) |
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| 154 | optdata->substitutionTable_num_lookupTables = |
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| 155 | (FT_Short)( currentIndex + 1 ); |
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| 156 | } |
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| 157 | |||
| 158 | |||
| 159 | static void |
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| 160 | gxv_morx_subtable_type1_LookupValue_validate( FT_UShort glyph, |
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| 161 | GXV_LookupValueCPtr value_p, |
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| 162 | GXV_Validator valid ) |
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| 163 | { |
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| 164 | FT_UNUSED( glyph ); /* for the non-debugging case */ |
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| 165 | |||
| 166 | GXV_TRACE(( "morx subtable type1 subst.: %d -> %d\n", glyph, value_p->u )); |
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| 167 | |||
| 168 | if ( value_p->u > valid->face->num_glyphs ) |
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| 169 | FT_INVALID_GLYPH_ID; |
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| 170 | } |
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| 171 | |||
| 172 | |||
| 173 | static GXV_LookupValueDesc |
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| 174 | gxv_morx_subtable_type1_LookupFmt4_transit( |
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| 175 | FT_UShort relative_gindex, |
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| 176 | GXV_LookupValueCPtr base_value_p, |
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| 177 | FT_Bytes lookuptbl_limit, |
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| 178 | GXV_Validator valid ) |
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| 179 | { |
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| 180 | FT_Bytes p; |
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| 181 | FT_Bytes limit; |
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| 182 | FT_UShort offset; |
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| 183 | GXV_LookupValueDesc value; |
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| 184 | |||
| 185 | /* XXX: check range? */ |
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| 186 | offset = (FT_UShort)( base_value_p->u + |
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| 187 | relative_gindex * sizeof ( FT_UShort ) ); |
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| 188 | |||
| 189 | p = valid->lookuptbl_head + offset; |
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| 190 | limit = lookuptbl_limit; |
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| 191 | |||
| 192 | GXV_LIMIT_CHECK ( 2 ); |
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| 193 | value.u = FT_NEXT_USHORT( p ); |
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| 194 | |||
| 195 | return value; |
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| 196 | } |
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| 197 | |||
| 198 | |||
| 199 | /* |
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| 200 | * TODO: length should be limit? |
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| 201 | **/ |
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| 202 | static void |
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| 203 | gxv_morx_subtable_type1_substitutionTable_validate( FT_Bytes table, |
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| 204 | FT_Bytes limit, |
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| 205 | GXV_Validator valid ) |
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| 206 | { |
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| 207 | FT_Bytes p = table; |
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| 208 | FT_UShort i; |
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| 209 | |||
| 210 | GXV_morx_subtable_type1_StateOptRecData optdata = |
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| 211 | (GXV_morx_subtable_type1_StateOptRecData)valid->xstatetable.optdata; |
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| 212 | |||
| 213 | |||
| 214 | /* TODO: calculate offset/length for each lookupTables */ |
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| 215 | valid->lookupval_sign = GXV_LOOKUPVALUE_UNSIGNED; |
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| 216 | valid->lookupval_func = gxv_morx_subtable_type1_LookupValue_validate; |
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| 217 | valid->lookupfmt4_trans = gxv_morx_subtable_type1_LookupFmt4_transit; |
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| 218 | |||
| 219 | for ( i = 0; i < optdata->substitutionTable_num_lookupTables; i++ ) |
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| 220 | { |
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| 221 | FT_ULong offset; |
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| 222 | |||
| 223 | |||
| 224 | GXV_LIMIT_CHECK( 4 ); |
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| 225 | offset = FT_NEXT_ULONG( p ); |
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| 226 | |||
| 227 | gxv_LookupTable_validate( table + offset, limit, valid ); |
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| 228 | } |
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| 229 | |||
| 230 | /* TODO: overlapping of lookupTables in substitutionTable */ |
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| 231 | } |
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| 232 | |||
| 233 | |||
| 234 | /* |
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| 235 | * subtable for Contextual glyph substitution is a modified StateTable. |
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| 236 | * In addition to classTable, stateArray, entryTable, the field |
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| 237 | * `substitutionTable' is added. |
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| 238 | */ |
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| 239 | FT_LOCAL_DEF( void ) |
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| 240 | gxv_morx_subtable_type1_validate( FT_Bytes table, |
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| 241 | FT_Bytes limit, |
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| 242 | GXV_Validator valid ) |
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| 243 | { |
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| 244 | FT_Bytes p = table; |
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| 245 | |||
| 246 | GXV_morx_subtable_type1_StateOptRec st_rec; |
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| 247 | |||
| 248 | |||
| 249 | GXV_NAME_ENTER( "morx chain subtable type1 (Contextual Glyph Subst)" ); |
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| 250 | |||
| 251 | GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE1_HEADER_SIZE ); |
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| 252 | |||
| 253 | st_rec.substitutionTable_num_lookupTables = 0; |
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| 254 | |||
| 255 | valid->xstatetable.optdata = |
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| 256 | &st_rec; |
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| 257 | valid->xstatetable.optdata_load_func = |
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| 258 | gxv_morx_subtable_type1_substitutionTable_load; |
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| 259 | valid->xstatetable.subtable_setup_func = |
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| 260 | gxv_morx_subtable_type1_subtable_setup; |
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| 261 | valid->xstatetable.entry_glyphoffset_fmt = |
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| 262 | GXV_GLYPHOFFSET_ULONG; |
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| 263 | valid->xstatetable.entry_validate_func = |
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| 264 | gxv_morx_subtable_type1_entry_validate; |
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| 265 | |||
| 266 | gxv_XStateTable_validate( p, limit, valid ); |
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| 267 | |||
| 268 | gxv_morx_subtable_type1_substitutionTable_validate( |
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| 269 | table + st_rec.substitutionTable, |
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| 270 | table + st_rec.substitutionTable + st_rec.substitutionTable_length, |
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| 271 | valid ); |
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| 272 | |||
| 273 | GXV_EXIT; |
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| 274 | } |
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| 275 | |||
| 276 | |||
| 277 | /* END */ |