src/third_party/freetype2/src/src/gxvalid/gxvmort5.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  gxvmort5.c                                                             */
   4 /*                                                                         */
   5 /*    TrueTypeGX/AAT mort table validation                                 */
   6 /*    body for type5 (Contextual Glyph Insertion) subtable.                */
   7 /*                                                                         */
   8 /*  Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K.,       */
   9 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  10 /*                                                                         */
  11 /*  This file is part of the FreeType project, and may only be used,       */
  12 /*  modified, and distributed under the terms of the FreeType project      */
  13 /*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
  14 /*  this file you indicate that you have read the license and              */
  15 /*  understand and accept it fully.                                        */
  16 /*                                                                         */
  17 /***************************************************************************/
  18
  19 /***************************************************************************/
  20 /*                                                                         */
  21 /* gxvalid is derived from both gxlayout module and otvalid module.        */
  22 /* Development of gxlayout is supported by the Information-technology      */
  23 /* Promotion Agency(IPA), Japan.                                           */
  24 /*                                                                         */
  25 /***************************************************************************/
  26
  27
  28 #include "gxvmort.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_gxvmort
  39
  40
  41   /*
  42    * mort subtable type5 (Contextual Glyph Insertion)
  43    * has the format of StateTable with insertion-glyph-list,
  44    * but without name.  The offset is given by glyphOffset in
  45    * entryTable.  There is no table location declaration
  46    * like xxxTable.
  47    */
  48
  49   typedef struct  GXV_mort_subtable_type5_StateOptRec_
  50   {
  51     FT_UShort   classTable;
  52     FT_UShort   stateArray;
  53     FT_UShort   entryTable;
  54
  55 #define GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE  GXV_STATETABLE_HEADER_SIZE
  56
  57     FT_UShort*  classTable_length_p;
  58     FT_UShort*  stateArray_length_p;
  59     FT_UShort*  entryTable_length_p;
  60
  61   }  GXV_mort_subtable_type5_StateOptRec,
  62     *GXV_mort_subtable_type5_StateOptRecData;
  63
  64
  65   FT_LOCAL_DEF( void )
  66   gxv_mort_subtable_type5_subtable_setup( FT_UShort      table_size,
  67                                           FT_UShort      classTable,
  68                                           FT_UShort      stateArray,
  69                                           FT_UShort      entryTable,
  70                                           FT_UShort*     classTable_length_p,
  71                                           FT_UShort*     stateArray_length_p,
  72                                           FT_UShort*     entryTable_length_p,
  73                                           GXV_Validator  valid )
  74   {
  75     GXV_mort_subtable_type5_StateOptRecData  optdata =
  76       (GXV_mort_subtable_type5_StateOptRecData)valid->statetable.optdata;
  77
  78
  79     gxv_StateTable_subtable_setup( table_size,
  80                                    classTable,
  81                                    stateArray,
  82                                    entryTable,
  83                                    classTable_length_p,
  84                                    stateArray_length_p,
  85                                    entryTable_length_p,
  86                                    valid );
  87
  88     optdata->classTable = classTable;
  89     optdata->stateArray = stateArray;
  90     optdata->entryTable = entryTable;
  91
  92     optdata->classTable_length_p = classTable_length_p;
  93     optdata->stateArray_length_p = stateArray_length_p;
  94     optdata->entryTable_length_p = entryTable_length_p;
  95   }
  96
  97
  98   static void
  99   gxv_mort_subtable_type5_InsertList_validate( FT_UShort      offset,
 100                                                FT_UShort      count,
 101                                                FT_Bytes       table,
 102                                                FT_Bytes       limit,
 103                                                GXV_Validator  valid )
 104   {
 105     /*
 106      * We don't know the range of insertion-glyph-list.
 107      * Set range by whole of state table.
 108      */
 109     FT_Bytes  p = table + offset;
 110
 111     GXV_mort_subtable_type5_StateOptRecData  optdata =
 112       (GXV_mort_subtable_type5_StateOptRecData)valid->statetable.optdata;
 113
 114     if ( optdata->classTable < offset                                   &&
 115          offset < optdata->classTable + *(optdata->classTable_length_p) )
 116       GXV_TRACE(( " offset runs into ClassTable" ));
 117     if ( optdata->stateArray < offset                                   &&
 118          offset < optdata->stateArray + *(optdata->stateArray_length_p) )
 119       GXV_TRACE(( " offset runs into StateArray" ));
 120     if ( optdata->entryTable < offset                                   &&
 121          offset < optdata->entryTable + *(optdata->entryTable_length_p) )
 122       GXV_TRACE(( " offset runs into EntryTable" ));
 123
 124 #ifndef GXV_LOAD_TRACE_VARS
 125     GXV_LIMIT_CHECK( count * 2 );
 126 #else
 127     while ( p < table + offset + ( count * 2 ) )
 128     {
 129       FT_UShort insert_glyphID;
 130
 131
 132       GXV_LIMIT_CHECK( 2 );
 133       insert_glyphID = FT_NEXT_USHORT( p );
 134       GXV_TRACE(( " 0x%04x", insert_glyphID ));
 135     }
 136     GXV_TRACE(( "\n" ));
 137 #endif
 138   }
 139
 140
 141   static void
 142   gxv_mort_subtable_type5_entry_validate(
 143     FT_Byte                         state,
 144     FT_UShort                       flags,
 145     GXV_StateTable_GlyphOffsetCPtr  glyphOffset,
 146     FT_Bytes                        table,
 147     FT_Bytes                        limit,
 148     GXV_Validator                   valid )
 149   {
 150 #ifdef GXV_LOAD_UNUSED_VARS
 151     FT_Bool    setMark;
 152     FT_Bool    dontAdvance;
 153     FT_Bool    currentIsKashidaLike;
 154     FT_Bool    markedIsKashidaLike;
 155     FT_Bool    currentInsertBefore;
 156     FT_Bool    markedInsertBefore;
 157 #endif
 158     FT_Byte    currentInsertCount;
 159     FT_Byte    markedInsertCount;
 160     FT_UShort  currentInsertList;
 161     FT_UShort  markedInsertList;
 162
 163     FT_UNUSED( state );
 164
 165
 166 #ifdef GXV_LOAD_UNUSED_VARS
 167     setMark              = FT_BOOL( ( flags >> 15 ) & 1 );
 168     dontAdvance          = FT_BOOL( ( flags >> 14 ) & 1 );
 169     currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
 170     markedIsKashidaLike  = FT_BOOL( ( flags >> 12 ) & 1 );
 171     currentInsertBefore  = FT_BOOL( ( flags >> 11 ) & 1 );
 172     markedInsertBefore   = FT_BOOL( ( flags >> 10 ) & 1 );
 173 #endif
 174
 175     currentInsertCount   = (FT_Byte)( ( flags >> 5 ) & 0x1F   );
 176     markedInsertCount    = (FT_Byte)(   flags        & 0x001F );
 177
 178     currentInsertList    = (FT_UShort)( glyphOffset->ul >> 16 );
 179     markedInsertList     = (FT_UShort)( glyphOffset->ul       );
 180
 181     if ( 0 != currentInsertList && 0 != currentInsertCount )
 182     {
 183       gxv_mort_subtable_type5_InsertList_validate( currentInsertList,
 184                                                    currentInsertCount,
 185                                                    table,
 186                                                    limit,
 187                                                    valid );
 188     }
 189
 190     if ( 0 != markedInsertList && 0 != markedInsertCount )
 191     {
 192       gxv_mort_subtable_type5_InsertList_validate( markedInsertList,
 193                                                    markedInsertCount,
 194                                                    table,
 195                                                    limit,
 196                                                    valid );
 197     }
 198   }
 199
 200
 201   FT_LOCAL_DEF( void )
 202   gxv_mort_subtable_type5_validate( FT_Bytes       table,
 203                                     FT_Bytes       limit,
 204                                     GXV_Validator  valid )
 205   {
 206     FT_Bytes  p = table;
 207
 208     GXV_mort_subtable_type5_StateOptRec      et_rec;
 209     GXV_mort_subtable_type5_StateOptRecData  et = &et_rec;
 210
 211
 212     GXV_NAME_ENTER( "mort chain subtable type5 (Glyph Insertion)" );
 213
 214     GXV_LIMIT_CHECK( GXV_MORT_SUBTABLE_TYPE5_HEADER_SIZE );
 215
 216     valid->statetable.optdata =
 217       et;
 218     valid->statetable.optdata_load_func =
 219       NULL;
 220     valid->statetable.subtable_setup_func =
 221       gxv_mort_subtable_type5_subtable_setup;
 222     valid->statetable.entry_glyphoffset_fmt =
 223       GXV_GLYPHOFFSET_ULONG;
 224     valid->statetable.entry_validate_func =
 225       gxv_mort_subtable_type5_entry_validate;
 226
 227     gxv_StateTable_validate( p, limit, valid );
 228
 229     GXV_EXIT;
 230   }
 231
 232
 233 /* END */