thirdparty/freetype-2.3.12/src/otvalid/otvgdef.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  otvgdef.c                                                              */
   4 /*                                                                         */
   5 /*    OpenType GDEF table validation (body).                               */
   6 /*                                                                         */
   7 /*  Copyright 2004, 2005, 2007 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
  22
  23   /*************************************************************************/
  24   /*                                                                       */
  25   /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  26   /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  27   /* messages during execution.                                            */
  28   /*                                                                       */
  29 #undef  FT_COMPONENT
  30 #define FT_COMPONENT  trace_otvgdef
  31
  32
  33   /*************************************************************************/
  34   /*************************************************************************/
  35   /*****                                                               *****/
  36   /*****                      UTILITY FUNCTIONS                        *****/
  37   /*****                                                               *****/
  38   /*************************************************************************/
  39   /*************************************************************************/
  40
  41 #define AttachListFunc    otv_O_x_Ox
  42 #define LigCaretListFunc  otv_O_x_Ox
  43
  44   /* sets valid->extra1 (0)           */
  45
  46   static void
  47   otv_O_x_Ox( FT_Bytes       table,
  48               OTV_Validator  valid )
  49   {
  50     FT_Bytes           p = table;
  51     FT_Bytes           Coverage;
  52     FT_UInt            GlyphCount;
  53     OTV_Validate_Func  func;
  54
  55
  56     OTV_ENTER;
  57
  58     OTV_LIMIT_CHECK( 4 );
  59     Coverage   = table + FT_NEXT_USHORT( p );
  60     GlyphCount = FT_NEXT_USHORT( p );
  61
  62     OTV_TRACE(( " (GlyphCount = %d)\n", GlyphCount ));
  63
  64     otv_Coverage_validate( Coverage, valid, GlyphCount );
  65     if ( GlyphCount != otv_Coverage_get_count( Coverage ) )
  66       FT_INVALID_DATA;
  67
  68     OTV_LIMIT_CHECK( GlyphCount * 2 );
  69
  70     valid->nesting_level++;
  71     func          = valid->func[valid->nesting_level];
  72     valid->extra1 = 0;
  73
  74     for ( ; GlyphCount > 0; GlyphCount-- )
  75       func( table + FT_NEXT_USHORT( p ), valid );
  76
  77     valid->nesting_level--;
  78
  79     OTV_EXIT;
  80   }
  81
  82
  83   /*************************************************************************/
  84   /*************************************************************************/
  85   /*****                                                               *****/
  86   /*****                       LIGATURE CARETS                         *****/
  87   /*****                                                               *****/
  88   /*************************************************************************/
  89   /*************************************************************************/
  90
  91 #define CaretValueFunc  otv_CaretValue_validate
  92
  93   static void
  94   otv_CaretValue_validate( FT_Bytes       table,
  95                            OTV_Validator  valid )
  96   {
  97     FT_Bytes  p = table;
  98     FT_UInt   CaretValueFormat;
  99
 100
 101     OTV_ENTER;
 102
 103     OTV_LIMIT_CHECK( 4 );
 104
 105     CaretValueFormat = FT_NEXT_USHORT( p );
 106
 107     OTV_TRACE(( " (format = %d)\n", CaretValueFormat ));
 108
 109     switch ( CaretValueFormat )
 110     {
 111     case 1:     /* CaretValueFormat1 */
 112       /* skip Coordinate, no test */
 113       break;
 114
 115     case 2:     /* CaretValueFormat2 */
 116       /* skip CaretValuePoint, no test */
 117       break;
 118
 119     case 3:     /* CaretValueFormat3 */
 120       p += 2;   /* skip Coordinate */
 121
 122       OTV_LIMIT_CHECK( 2 );
 123
 124       /* DeviceTable */
 125       otv_Device_validate( table + FT_NEXT_USHORT( p ), valid );
 126       break;
 127
 128     default:
 129       FT_INVALID_FORMAT;
 130     }
 131
 132     OTV_EXIT;
 133   }
 134
 135
 136   /*************************************************************************/
 137   /*************************************************************************/
 138   /*****                                                               *****/
 139   /*****                         GDEF TABLE                            *****/
 140   /*****                                                               *****/
 141   /*************************************************************************/
 142   /*************************************************************************/
 143
 144   /* sets valid->glyph_count */
 145
 146   FT_LOCAL_DEF( void )
 147   otv_GDEF_validate( FT_Bytes      table,
 148                      FT_Bytes      gsub,
 149                      FT_Bytes      gpos,
 150                      FT_UInt       glyph_count,
 151                      FT_Validator  ftvalid )
 152   {
 153     OTV_ValidatorRec  validrec;
 154     OTV_Validator     valid = &validrec;
 155     FT_Bytes          p     = table;
 156     FT_UInt           table_size;
 157     FT_Bool           need_MarkAttachClassDef;
 158
 159     OTV_OPTIONAL_TABLE( GlyphClassDef );
 160     OTV_OPTIONAL_TABLE( AttachListOffset );
 161     OTV_OPTIONAL_TABLE( LigCaretListOffset );
 162     OTV_OPTIONAL_TABLE( MarkAttachClassDef );
 163
 164
 165     valid->root = ftvalid;
 166
 167     FT_TRACE3(( "validating GDEF table\n" ));
 168     OTV_INIT;
 169
 170     OTV_LIMIT_CHECK( 12 );
 171
 172     if ( FT_NEXT_ULONG( p ) != 0x10000UL )          /* Version */
 173       FT_INVALID_FORMAT;
 174
 175     /* MarkAttachClassDef has been added to the OpenType */
 176     /* specification without increasing GDEF's version,  */
 177     /* so we use this ugly hack to find out whether the  */
 178     /* table is needed actually.                         */
 179
 180     need_MarkAttachClassDef = FT_BOOL(
 181       otv_GSUBGPOS_have_MarkAttachmentType_flag( gsub ) ||
 182       otv_GSUBGPOS_have_MarkAttachmentType_flag( gpos ) );
 183
 184     if ( need_MarkAttachClassDef )
 185       table_size = 12;              /* OpenType >= 1.2 */
 186     else
 187       table_size = 10;              /* OpenType < 1.2  */
 188
 189     valid->glyph_count = glyph_count;
 190
 191     OTV_OPTIONAL_OFFSET( GlyphClassDef );
 192     OTV_SIZE_CHECK( GlyphClassDef );
 193     if ( GlyphClassDef )
 194       otv_ClassDef_validate( table + GlyphClassDef, valid );
 195
 196     OTV_OPTIONAL_OFFSET( AttachListOffset );
 197     OTV_SIZE_CHECK( AttachListOffset );
 198     if ( AttachListOffset )
 199     {
 200       OTV_NEST2( AttachList, AttachPoint );
 201       OTV_RUN( table + AttachListOffset, valid );
 202     }
 203
 204     OTV_OPTIONAL_OFFSET( LigCaretListOffset );
 205     OTV_SIZE_CHECK( LigCaretListOffset );
 206     if ( LigCaretListOffset )
 207     {
 208       OTV_NEST3( LigCaretList, LigGlyph, CaretValue );
 209       OTV_RUN( table + LigCaretListOffset, valid );
 210     }
 211
 212     if ( need_MarkAttachClassDef )
 213     {
 214       OTV_OPTIONAL_OFFSET( MarkAttachClassDef );
 215       OTV_SIZE_CHECK( MarkAttachClassDef );
 216       if ( MarkAttachClassDef )
 217         otv_ClassDef_validate( table + MarkAttachClassDef, valid );
 218     }
 219
 220     FT_TRACE4(( "\n" ));
 221   }
 222
 223
 224 /* END */