/src/freetype/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 */