extension/SDL2_ttf-2.0.14/external/freetype-2.4.12/src/gxvalid/gxvmorx5.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  gxvmorx5.c                                                             */
   4 /*                                                                         */
   5 /*    TrueTypeGX/AAT morx table validation                                 */
   6 /*    body for type5 (Contextual Glyph Insertion) subtable.                */
   7 /*                                                                         */
   8 /*  Copyright 2005, 2007 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 "gxvmorx.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_gxvmorx
  39
  40
  41   /*
  42    * `morx' subtable type5 (Contextual Glyph Insertion)
  43    * has format of a StateTable with insertion-glyph-list
  44    * without name.  However, the 32bit offset from the head
  45    * of subtable to the i-g-l is given after `entryTable',
  46    * without variable name specification (the existence of
  47    * this offset to the table is different from mort type5).
  48    */
  49
  50
  51   typedef struct  GXV_morx_subtable_type5_StateOptRec_
  52   {
  53     FT_ULong  insertionGlyphList;
  54     FT_ULong  insertionGlyphList_length;
  55
  56   }  GXV_morx_subtable_type5_StateOptRec,
  57     *GXV_morx_subtable_type5_StateOptRecData;
  58
  59
  60 #define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE \
  61           ( GXV_STATETABLE_HEADER_SIZE + 4 )
  62
  63
  64   static void
  65   gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes       table,
  66                                                    FT_Bytes       limit,
  67                                                    GXV_Validator  valid )
  68   {
  69     FT_Bytes  p = table;
  70
  71     GXV_morx_subtable_type5_StateOptRecData  optdata =
  72       (GXV_morx_subtable_type5_StateOptRecData)valid->xstatetable.optdata;
  73
  74
  75     GXV_LIMIT_CHECK( 4 );
  76     optdata->insertionGlyphList = FT_NEXT_ULONG( p );
  77   }
  78
  79
  80   static void
  81   gxv_morx_subtable_type5_subtable_setup( FT_ULong       table_size,
  82                                           FT_ULong       classTable,
  83                                           FT_ULong       stateArray,
  84                                           FT_ULong       entryTable,
  85                                           FT_ULong*      classTable_length_p,
  86                                           FT_ULong*      stateArray_length_p,
  87                                           FT_ULong*      entryTable_length_p,
  88                                           GXV_Validator  valid )
  89   {
  90     FT_ULong   o[4];
  91     FT_ULong*  l[4];
  92     FT_ULong   buff[5];
  93
  94     GXV_morx_subtable_type5_StateOptRecData  optdata =
  95       (GXV_morx_subtable_type5_StateOptRecData)valid->xstatetable.optdata;
  96
  97
  98     o[0] = classTable;
  99     o[1] = stateArray;
 100     o[2] = entryTable;
 101     o[3] = optdata->insertionGlyphList;
 102     l[0] = classTable_length_p;
 103     l[1] = stateArray_length_p;
 104     l[2] = entryTable_length_p;
 105     l[3] = &(optdata->insertionGlyphList_length);
 106
 107     gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, valid );
 108   }
 109
 110
 111   static void
 112   gxv_morx_subtable_type5_InsertList_validate( FT_UShort      table_index,
 113                                                FT_UShort      count,
 114                                                FT_Bytes       table,
 115                                                FT_Bytes       limit,
 116                                                GXV_Validator  valid )
 117   {
 118     FT_Bytes p = table + table_index * 2;
 119
 120
 121 #ifndef GXV_LOAD_TRACE_VARS
 122     GXV_LIMIT_CHECK( count * 2 );
 123 #else
 124     while ( p < table + count * 2 + table_index * 2 )
 125     {
 126       FT_UShort  insert_glyphID;
 127
 128
 129       GXV_LIMIT_CHECK( 2 );
 130       insert_glyphID = FT_NEXT_USHORT( p );
 131       GXV_TRACE(( " 0x%04x", insert_glyphID ));
 132     }
 133
 134     GXV_TRACE(( "\n" ));
 135 #endif
 136   }
 137
 138
 139   static void
 140   gxv_morx_subtable_type5_entry_validate(
 141     FT_UShort                       state,
 142     FT_UShort                       flags,
 143     GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
 144     FT_Bytes                        table,
 145     FT_Bytes                        limit,
 146     GXV_Validator                   valid )
 147   {
 148 #ifdef GXV_LOAD_UNUSED_VARS
 149     FT_Bool    setMark;
 150     FT_Bool    dontAdvance;
 151     FT_Bool    currentIsKashidaLike;
 152     FT_Bool    markedIsKashidaLike;
 153     FT_Bool    currentInsertBefore;
 154     FT_Bool    markedInsertBefore;
 155 #endif
 156     FT_Byte    currentInsertCount;
 157     FT_Byte    markedInsertCount;
 158     FT_Byte    currentInsertList;
 159     FT_UShort  markedInsertList;
 160
 161     FT_UNUSED( state );
 162
 163
 164 #ifdef GXV_LOAD_UNUSED_VARS
 165     setMark              = FT_BOOL( ( flags >> 15 ) & 1 );
 166     dontAdvance          = FT_BOOL( ( flags >> 14 ) & 1 );
 167     currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
 168     markedIsKashidaLike  = FT_BOOL( ( flags >> 12 ) & 1 );
 169     currentInsertBefore  = FT_BOOL( ( flags >> 11 ) & 1 );
 170     markedInsertBefore   = FT_BOOL( ( flags >> 10 ) & 1 );
 171 #endif
 172
 173     currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F   );
 174     markedInsertCount  = (FT_Byte)(   flags        & 0x001F );
 175
 176     currentInsertList = (FT_Byte)  ( glyphOffset_p->ul >> 16 );
 177     markedInsertList  = (FT_UShort)( glyphOffset_p->ul       );
 178
 179     if ( currentInsertList && 0 != currentInsertCount )
 180       gxv_morx_subtable_type5_InsertList_validate( currentInsertList,
 181                                                    currentInsertCount,
 182                                                    table, limit,
 183                                                    valid );
 184
 185     if ( markedInsertList && 0 != markedInsertCount )
 186       gxv_morx_subtable_type5_InsertList_validate( markedInsertList,
 187                                                    markedInsertCount,
 188                                                    table, limit,
 189                                                    valid );
 190   }
 191
 192
 193   FT_LOCAL_DEF( void )
 194   gxv_morx_subtable_type5_validate( FT_Bytes       table,
 195                                     FT_Bytes       limit,
 196                                     GXV_Validator  valid )
 197   {
 198     FT_Bytes  p = table;
 199
 200     GXV_morx_subtable_type5_StateOptRec      et_rec;
 201     GXV_morx_subtable_type5_StateOptRecData  et = &et_rec;
 202
 203
 204     GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" );
 205
 206     GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE );
 207
 208     valid->xstatetable.optdata =
 209       et;
 210     valid->xstatetable.optdata_load_func =
 211       gxv_morx_subtable_type5_insertionGlyphList_load;
 212     valid->xstatetable.subtable_setup_func =
 213       gxv_morx_subtable_type5_subtable_setup;
 214     valid->xstatetable.entry_glyphoffset_fmt =
 215       GXV_GLYPHOFFSET_ULONG;
 216     valid->xstatetable.entry_validate_func =
 217       gxv_morx_subtable_type5_entry_validate;
 218
 219     gxv_XStateTable_validate( p, limit, valid );
 220
 221     GXV_EXIT;
 222   }
 223
 224
 225 /* END */