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/src/freetype/src/gxvalid/gxvmort5.c

https://bitbucket.org/cabalistic/ogredeps/
C | 233 lines | 147 code | 44 blank | 42 comment | 12 complexity | 8ffc154bcb3e1dcb14051bd46d03a4bb MD5 | raw file
  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 */