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/modules/freetype2/src/gxvalid/gxvmort.c

http://github.com/zpao/v8monkey
C | 285 lines | 187 code | 62 blank | 36 comment | 21 complexity | cef81604193e880b819f61ef149c23d7 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  gxvmort.c                                                              */
  4/*                                                                         */
  5/*    TrueTypeGX/AAT mort table validation (body).                         */
  6/*                                                                         */
  7/*  Copyright 2005 by suzuki toshiya, Masatake YAMATO, Red Hat K.K.,       */
  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/*                                                                         */
 20/* gxvalid is derived from both gxlayout module and otvalid module.        */
 21/* Development of gxlayout is supported by the Information-technology      */
 22/* Promotion Agency(IPA), Japan.                                           */
 23/*                                                                         */
 24/***************************************************************************/
 25
 26
 27#include "gxvmort.h"
 28#include "gxvfeat.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  static void
 42  gxv_mort_feature_validate( GXV_mort_feature  f,
 43                             GXV_Validator     valid )
 44  {
 45    if ( f->featureType >= gxv_feat_registry_length )
 46    {
 47      GXV_TRACE(( "featureType %d is out of registered range, "
 48                  "setting %d is unchecked\n",
 49                  f->featureType, f->featureSetting ));
 50      if ( valid->root->level >= FT_VALIDATE_PARANOID )
 51        FT_INVALID_DATA;
 52    }
 53    else if ( !gxv_feat_registry[f->featureType].existence )
 54    {
 55      GXV_TRACE(( "featureType %d is within registered area "
 56                  "but undefined, setting %d is unchecked\n",
 57                  f->featureType, f->featureSetting ));
 58      if ( valid->root->level >= FT_VALIDATE_PARANOID )
 59        FT_INVALID_DATA;
 60    }
 61    else
 62    {
 63      FT_Byte  nSettings_max;
 64
 65
 66      /* nSettings in gxvfeat.c is halved for exclusive on/off settings */
 67      nSettings_max = gxv_feat_registry[f->featureType].nSettings;
 68      if ( gxv_feat_registry[f->featureType].exclusive )
 69        nSettings_max = (FT_Byte)( 2 * nSettings_max );
 70
 71      GXV_TRACE(( "featureType %d is registered", f->featureType ));
 72      GXV_TRACE(( "setting %d", f->featureSetting ));
 73
 74      if ( f->featureSetting > nSettings_max )
 75      {
 76        GXV_TRACE(( "out of defined range %d", nSettings_max ));
 77        if ( valid->root->level >= FT_VALIDATE_PARANOID )
 78          FT_INVALID_DATA;
 79      }
 80      GXV_TRACE(( "\n" ));
 81    }
 82
 83    /* TODO: enableFlags must be unique value in specified chain?  */
 84  }
 85
 86
 87  /*
 88   * nFeatureFlags is typed to FT_ULong to accept that in
 89   * mort (typed FT_UShort) and morx (typed FT_ULong).
 90   */
 91  FT_LOCAL_DEF( void )
 92  gxv_mort_featurearray_validate( FT_Bytes       table,
 93                                  FT_Bytes       limit,
 94                                  FT_ULong       nFeatureFlags,
 95                                  GXV_Validator  valid )
 96  {
 97    FT_Bytes  p = table;
 98    FT_ULong  i;
 99
100    GXV_mort_featureRec  f = GXV_MORT_FEATURE_OFF;
101
102
103    GXV_NAME_ENTER( "mort feature list" );
104    for ( i = 0; i < nFeatureFlags; i++ )
105    {
106      GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 );
107      f.featureType    = FT_NEXT_USHORT( p );
108      f.featureSetting = FT_NEXT_USHORT( p );
109      f.enableFlags    = FT_NEXT_ULONG( p );
110      f.disableFlags   = FT_NEXT_ULONG( p );
111
112      gxv_mort_feature_validate( &f, valid );
113    }
114
115    if ( !IS_GXV_MORT_FEATURE_OFF( f ) )
116      FT_INVALID_DATA;
117
118    valid->subtable_length = p - table;
119    GXV_EXIT;
120  }
121
122
123  FT_LOCAL_DEF( void )
124  gxv_mort_coverage_validate( FT_UShort      coverage,
125                              GXV_Validator  valid )
126  {
127    FT_UNUSED( valid );
128
129    if ( coverage & 0x8000U )
130      GXV_TRACE(( " this subtable is for vertical text only\n" ));
131    else
132      GXV_TRACE(( " this subtable is for horizontal text only\n" ));
133
134    if ( coverage & 0x4000 )
135      GXV_TRACE(( " this subtable is applied to glyph array "
136                  "in descending order\n" ));
137    else
138      GXV_TRACE(( " this subtable is applied to glyph array "
139                  "in ascending order\n" ));
140
141    if ( coverage & 0x2000 )
142      GXV_TRACE(( " this subtable is forcibly applied to "
143                  "vertical/horizontal text\n" ));
144
145    if ( coverage & 0x1FF8 )
146      GXV_TRACE(( " coverage has non-zero bits in reserved area\n" ));
147  }
148
149
150  static void
151  gxv_mort_subtables_validate( FT_Bytes       table,
152                               FT_Bytes       limit,
153                               FT_UShort      nSubtables,
154                               GXV_Validator  valid )
155  {
156    FT_Bytes  p = table;
157
158    GXV_Validate_Func fmt_funcs_table[] =
159    {
160      gxv_mort_subtable_type0_validate, /* 0 */
161      gxv_mort_subtable_type1_validate, /* 1 */
162      gxv_mort_subtable_type2_validate, /* 2 */
163      NULL,                             /* 3 */
164      gxv_mort_subtable_type4_validate, /* 4 */
165      gxv_mort_subtable_type5_validate, /* 5 */
166
167    };
168
169    GXV_Validate_Func  func;
170    FT_UShort          i;
171
172
173    GXV_NAME_ENTER( "subtables in a chain" );
174
175    for ( i = 0; i < nSubtables; i++ )
176    {
177      FT_UShort  length;
178      FT_UShort  coverage;
179      FT_ULong   subFeatureFlags;
180      FT_UInt    type;
181      FT_UInt    rest;
182
183
184      GXV_LIMIT_CHECK( 2 + 2 + 4 );
185      length          = FT_NEXT_USHORT( p );
186      coverage        = FT_NEXT_USHORT( p );
187      subFeatureFlags = FT_NEXT_ULONG( p );
188
189      GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
190                  i + 1, nSubtables, length ));
191      type = coverage & 0x0007;
192      rest = length - ( 2 + 2 + 4 );
193
194      GXV_LIMIT_CHECK( rest );
195      gxv_mort_coverage_validate( coverage, valid );
196
197      if ( type > 5 )
198        FT_INVALID_FORMAT;
199
200      func = fmt_funcs_table[type];
201      if ( func == NULL )
202        GXV_TRACE(( "morx type %d is reserved\n", type ));
203
204      func( p, p + rest, valid );
205
206      p += rest;
207    }
208
209    valid->subtable_length = p - table;
210
211    GXV_EXIT;
212  }
213
214
215  static void
216  gxv_mort_chain_validate( FT_Bytes       table,
217                           FT_Bytes       limit,
218                           GXV_Validator  valid )
219  {
220    FT_Bytes   p = table;
221    FT_ULong   defaultFlags;
222    FT_ULong   chainLength;
223    FT_UShort  nFeatureFlags;
224    FT_UShort  nSubtables;
225
226
227    GXV_NAME_ENTER( "mort chain header" );
228
229    GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 );
230    defaultFlags  = FT_NEXT_ULONG( p );
231    chainLength   = FT_NEXT_ULONG( p );
232    nFeatureFlags = FT_NEXT_USHORT( p );
233    nSubtables    = FT_NEXT_USHORT( p );
234
235    gxv_mort_featurearray_validate( p, table + chainLength,
236                                    nFeatureFlags, valid );
237    p += valid->subtable_length;
238    gxv_mort_subtables_validate( p, table + chainLength, nSubtables, valid );
239    valid->subtable_length = chainLength;
240
241    GXV_EXIT;
242  }
243
244
245  FT_LOCAL_DEF( void )
246  gxv_mort_validate( FT_Bytes      table,
247                     FT_Face       face,
248                     FT_Validator  ftvalid )
249  {
250    GXV_ValidatorRec  validrec;
251    GXV_Validator     valid = &validrec;
252    FT_Bytes          p     = table;
253    FT_Bytes          limit = 0;
254    FT_ULong          version;
255    FT_ULong          nChains;
256    FT_ULong          i;
257
258
259    valid->root = ftvalid;
260    valid->face = face;
261    limit       = valid->root->limit;
262
263    FT_TRACE3(( "validating `mort' table\n" ));
264    GXV_INIT;
265
266    GXV_LIMIT_CHECK( 4 + 4 );
267    version = FT_NEXT_ULONG( p );
268    nChains = FT_NEXT_ULONG( p );
269
270    if (version != 0x00010000UL)
271      FT_INVALID_FORMAT;
272
273    for ( i = 0; i < nChains; i++ )
274    {
275      GXV_TRACE(( "validating chain %d/%d\n", i + 1, nChains ));
276      GXV_32BIT_ALIGNMENT_VALIDATE( p - table );
277      gxv_mort_chain_validate( p, limit, valid );
278      p += valid->subtable_length;
279    }
280
281    FT_TRACE4(( "\n" ));
282  }
283
284
285/* END */