1 /***************************************************************************/
5 /* TrueTypeGX/AAT kern table validation (body). */
7 /* Copyright 2004, 2005, 2006, 2007 */
8 /* by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
9 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
17 /***************************************************************************/
19 /***************************************************************************/
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. */
25 /***************************************************************************/
31 #include FT_SFNT_NAMES_H
32 #include FT_SERVICE_GX_VALIDATE_H
35 /*************************************************************************/
37 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
38 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
39 /* messages during execution. */
42 #define FT_COMPONENT trace_gxvkern
45 /*************************************************************************/
46 /*************************************************************************/
48 /***** Data and Types *****/
50 /*************************************************************************/
51 /*************************************************************************/
53 typedef enum GXV_kern_Version_
55 KERN_VERSION_CLASSIC = 0x0000,
56 KERN_VERSION_NEW = 0x0001
61 typedef enum GXV_kern_Dialect_
63 KERN_DIALECT_UNKNOWN = 0,
64 KERN_DIALECT_MS = FT_VALIDATE_MS,
65 KERN_DIALECT_APPLE = FT_VALIDATE_APPLE,
66 KERN_DIALECT_ANY = FT_VALIDATE_CKERN
71 typedef struct GXV_kern_DataRec_
73 GXV_kern_Version version;
75 GXV_kern_Dialect dialect_request;
77 } GXV_kern_DataRec, *GXV_kern_Data;
80 #define GXV_KERN_DATA( field ) GXV_TABLE_DATA( kern, field )
82 #define KERN_IS_CLASSIC( valid ) \
83 ( KERN_VERSION_CLASSIC == GXV_KERN_DATA( version ) )
84 #define KERN_IS_NEW( valid ) \
85 ( KERN_VERSION_NEW == GXV_KERN_DATA( version ) )
87 #define KERN_DIALECT( valid ) \
88 GXV_KERN_DATA( dialect_request )
89 #define KERN_ALLOWS_MS( valid ) \
90 ( KERN_DIALECT( valid ) & KERN_DIALECT_MS )
91 #define KERN_ALLOWS_APPLE( valid ) \
92 ( KERN_DIALECT( valid ) & KERN_DIALECT_APPLE )
94 #define GXV_KERN_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 4 )
95 #define GXV_KERN_SUBTABLE_HEADER_SIZE ( KERN_IS_NEW( valid ) ? 8 : 6 )
98 /*************************************************************************/
99 /*************************************************************************/
101 /***** SUBTABLE VALIDATORS *****/
103 /*************************************************************************/
104 /*************************************************************************/
107 /* ============================= format 0 ============================== */
110 gxv_kern_subtable_fmt0_pairs_validate( FT_Bytes table,
113 GXV_Validator valid )
118 FT_UShort last_gid_left = 0;
119 FT_UShort last_gid_right = 0;
124 GXV_NAME_ENTER( "kern format 0 pairs" );
126 for ( i = 0; i < nPairs; i++ )
130 #ifdef GXV_LOAD_UNUSED_VARS
136 gid_left = FT_NEXT_USHORT( p );
137 gxv_glyphid_validate( gid_left, valid );
140 gid_right = FT_NEXT_USHORT( p );
141 gxv_glyphid_validate( gid_right, valid );
143 /* Pairs of left and right GIDs must be unique and sorted. */
144 GXV_TRACE(( "left gid = %u, right gid = %u\n", gid_left, gid_right ));
145 if ( gid_left == last_gid_left )
147 if ( last_gid_right < gid_right )
148 last_gid_right = gid_right;
152 else if ( last_gid_left < gid_left )
154 last_gid_left = gid_left;
155 last_gid_right = gid_right;
160 /* skip the kern value */
161 #ifdef GXV_LOAD_UNUSED_VARS
162 kernValue = FT_NEXT_SHORT( p );
172 gxv_kern_subtable_fmt0_validate( FT_Bytes table,
174 GXV_Validator valid )
176 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
182 GXV_NAME_ENTER( "kern subtable format 0" );
184 unitSize = 2 + 2 + 2;
187 /* nPairs, searchRange, entrySelector, rangeShift */
188 GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
189 gxv_BinSrchHeader_validate( p, limit, &unitSize, &nPairs, valid );
192 gxv_kern_subtable_fmt0_pairs_validate( p, limit, nPairs, valid );
198 /* ============================= format 1 ============================== */
201 typedef struct GXV_kern_fmt1_StateOptRec_
203 FT_UShort valueTable;
204 FT_UShort valueTable_length;
206 } GXV_kern_fmt1_StateOptRec, *GXV_kern_fmt1_StateOptRecData;
210 gxv_kern_subtable_fmt1_valueTable_load( FT_Bytes table,
212 GXV_Validator valid )
215 GXV_kern_fmt1_StateOptRecData optdata =
216 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
219 GXV_LIMIT_CHECK( 2 );
220 optdata->valueTable = FT_NEXT_USHORT( p );
225 * passed tables_size covers whole StateTable, including kern fmt1 header
228 gxv_kern_subtable_fmt1_subtable_setup( FT_UShort table_size,
229 FT_UShort classTable,
230 FT_UShort stateArray,
231 FT_UShort entryTable,
232 FT_UShort* classTable_length_p,
233 FT_UShort* stateArray_length_p,
234 FT_UShort* entryTable_length_p,
235 GXV_Validator valid )
241 GXV_kern_fmt1_StateOptRecData optdata =
242 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
248 o[3] = optdata->valueTable;
249 l[0] = classTable_length_p;
250 l[1] = stateArray_length_p;
251 l[2] = entryTable_length_p;
252 l[3] = &(optdata->valueTable_length);
254 gxv_set_length_by_ushort_offset( o, l, buff, 4, table_size, valid );
259 * passed table & limit are of whole StateTable, not including subtables
262 gxv_kern_subtable_fmt1_entry_validate(
265 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
268 GXV_Validator valid )
270 #ifdef GXV_LOAD_UNUSED_VARS
272 FT_UShort dontAdvance;
274 FT_UShort valueOffset;
275 #ifdef GXV_LOAD_UNUSED_VARS
276 FT_UShort kernAction;
281 FT_UNUSED( glyphOffset_p );
284 #ifdef GXV_LOAD_UNUSED_VARS
285 push = (FT_UShort)( ( flags >> 15 ) & 1 );
286 dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
288 valueOffset = (FT_UShort)( flags & 0x3FFF );
291 GXV_kern_fmt1_StateOptRecData vt_rec =
292 (GXV_kern_fmt1_StateOptRecData)valid->statetable.optdata;
296 if ( valueOffset < vt_rec->valueTable )
299 p = table + valueOffset;
300 limit = table + vt_rec->valueTable + vt_rec->valueTable_length;
302 GXV_LIMIT_CHECK( 2 + 2 );
303 #ifdef GXV_LOAD_UNUSED_VARS
304 kernAction = FT_NEXT_USHORT( p );
305 kernValue = FT_NEXT_USHORT( p );
314 gxv_kern_subtable_fmt1_validate( FT_Bytes table,
316 GXV_Validator valid )
319 GXV_kern_fmt1_StateOptRec vt_rec;
322 GXV_NAME_ENTER( "kern subtable format 1" );
324 valid->statetable.optdata =
326 valid->statetable.optdata_load_func =
327 gxv_kern_subtable_fmt1_valueTable_load;
328 valid->statetable.subtable_setup_func =
329 gxv_kern_subtable_fmt1_subtable_setup;
330 valid->statetable.entry_glyphoffset_fmt =
331 GXV_GLYPHOFFSET_NONE;
332 valid->statetable.entry_validate_func =
333 gxv_kern_subtable_fmt1_entry_validate;
335 gxv_StateTable_validate( p, limit, valid );
341 /* ================ Data for Class-Based Subtables 2, 3 ================ */
343 typedef enum GXV_kern_ClassSpec_
348 } GXV_kern_ClassSpec;
351 /* ============================= format 2 ============================== */
353 /* ---------------------- format 2 specific data ----------------------- */
355 typedef struct GXV_kern_subtable_fmt2_DataRec_
359 FT_UShort offset_min[2];
360 FT_UShort offset_max[2];
361 const FT_String* class_tag[2];
362 GXV_odtect_Range odtect;
364 } GXV_kern_subtable_fmt2_DataRec, *GXV_kern_subtable_fmt2_Data;
367 #define GXV_KERN_FMT2_DATA( field ) \
368 ( ( (GXV_kern_subtable_fmt2_DataRec *) \
369 ( GXV_KERN_DATA( subtable_data ) ) )->field )
372 /* -------------------------- utility functions ----------------------- */
375 gxv_kern_subtable_fmt2_clstbl_validate( FT_Bytes table,
377 GXV_kern_ClassSpec spec,
378 GXV_Validator valid )
380 const FT_String* tag = GXV_KERN_FMT2_DATA( class_tag[spec] );
381 GXV_odtect_Range odtect = GXV_KERN_FMT2_DATA( odtect );
384 FT_UShort firstGlyph;
388 GXV_NAME_ENTER( "kern format 2 classTable" );
390 GXV_LIMIT_CHECK( 2 + 2 );
391 firstGlyph = FT_NEXT_USHORT( p );
392 nGlyphs = FT_NEXT_USHORT( p );
393 GXV_TRACE(( " %s firstGlyph=%d, nGlyphs=%d\n",
394 tag, firstGlyph, nGlyphs ));
396 gxv_glyphid_validate( firstGlyph, valid );
397 gxv_glyphid_validate( (FT_UShort)( firstGlyph + nGlyphs - 1 ), valid );
399 gxv_array_getlimits_ushort( p, p + ( 2 * nGlyphs ),
400 &( GXV_KERN_FMT2_DATA( offset_min[spec] ) ),
401 &( GXV_KERN_FMT2_DATA( offset_max[spec] ) ),
404 gxv_odtect_add_range( table, 2 * nGlyphs, tag, odtect );
411 gxv_kern_subtable_fmt2_validate( FT_Bytes table,
413 GXV_Validator valid )
415 GXV_ODTECT( 3, odtect );
416 GXV_kern_subtable_fmt2_DataRec fmt2_rec =
417 { 0, 0, { 0, 0 }, { 0, 0 }, { "leftClass", "rightClass" }, NULL };
419 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
420 FT_UShort leftOffsetTable;
421 FT_UShort rightOffsetTable;
424 GXV_NAME_ENTER( "kern subtable format 2" );
426 GXV_ODTECT_INIT( odtect );
427 fmt2_rec.odtect = odtect;
428 GXV_KERN_DATA( subtable_data ) = &fmt2_rec;
430 GXV_LIMIT_CHECK( 2 + 2 + 2 + 2 );
431 GXV_KERN_FMT2_DATA( rowWidth ) = FT_NEXT_USHORT( p );
432 leftOffsetTable = FT_NEXT_USHORT( p );
433 rightOffsetTable = FT_NEXT_USHORT( p );
434 GXV_KERN_FMT2_DATA( array ) = FT_NEXT_USHORT( p );
436 GXV_TRACE(( "rowWidth = %d\n", GXV_KERN_FMT2_DATA( rowWidth ) ));
439 GXV_LIMIT_CHECK( leftOffsetTable );
440 GXV_LIMIT_CHECK( rightOffsetTable );
441 GXV_LIMIT_CHECK( GXV_KERN_FMT2_DATA( array ) );
443 gxv_kern_subtable_fmt2_clstbl_validate( table + leftOffsetTable, limit,
444 GXV_KERN_CLS_L, valid );
446 gxv_kern_subtable_fmt2_clstbl_validate( table + rightOffsetTable, limit,
447 GXV_KERN_CLS_R, valid );
449 if ( GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_L] ) +
450 GXV_KERN_FMT2_DATA( offset_min[GXV_KERN_CLS_R] )
451 < GXV_KERN_FMT2_DATA( array ) )
454 gxv_odtect_add_range( table + GXV_KERN_FMT2_DATA( array ),
455 GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_L] )
456 + GXV_KERN_FMT2_DATA( offset_max[GXV_KERN_CLS_R] )
457 - GXV_KERN_FMT2_DATA( array ),
460 gxv_odtect_validate( odtect, valid );
466 /* ============================= format 3 ============================== */
469 gxv_kern_subtable_fmt3_validate( FT_Bytes table,
471 GXV_Validator valid )
473 FT_Bytes p = table + GXV_KERN_SUBTABLE_HEADER_SIZE;
474 FT_UShort glyphCount;
475 FT_Byte kernValueCount;
476 FT_Byte leftClassCount;
477 FT_Byte rightClassCount;
481 GXV_NAME_ENTER( "kern subtable format 3" );
483 GXV_LIMIT_CHECK( 2 + 1 + 1 + 1 + 1 );
484 glyphCount = FT_NEXT_USHORT( p );
485 kernValueCount = FT_NEXT_BYTE( p );
486 leftClassCount = FT_NEXT_BYTE( p );
487 rightClassCount = FT_NEXT_BYTE( p );
488 flags = FT_NEXT_BYTE( p );
490 if ( valid->face->num_glyphs != glyphCount )
492 GXV_TRACE(( "maxGID=%d, but glyphCount=%d\n",
493 valid->face->num_glyphs, glyphCount ));
494 GXV_SET_ERR_IF_PARANOID( FT_INVALID_GLYPH_ID );
498 GXV_TRACE(( "kern subtable fmt3 has nonzero value"
499 " (%d) in unused flag\n", flags ));
501 * just skip kernValue[kernValueCount]
503 GXV_LIMIT_CHECK( 2 * kernValueCount );
504 p += 2 * kernValueCount;
507 * check leftClass[gid] < leftClassCount
513 GXV_LIMIT_CHECK( glyphCount );
514 gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
515 p += valid->subtable_length;
517 if ( leftClassCount < max )
522 * check rightClass[gid] < rightClassCount
528 GXV_LIMIT_CHECK( glyphCount );
529 gxv_array_getlimits_byte( p, p + glyphCount, &min, &max, valid );
530 p += valid->subtable_length;
532 if ( rightClassCount < max )
537 * check kernIndex[i, j] < kernValueCount
543 for ( i = 0; i < leftClassCount; i++ )
545 for ( j = 0; j < rightClassCount; j++ )
547 GXV_LIMIT_CHECK( 1 );
548 if ( kernValueCount < FT_NEXT_BYTE( p ) )
554 valid->subtable_length = p - table;
561 gxv_kern_coverage_new_apple_validate( FT_UShort coverage,
563 GXV_Validator valid )
565 /* new Apple-dialect */
566 #ifdef GXV_LOAD_TRACE_VARS
567 FT_Bool kernVertical;
568 FT_Bool kernCrossStream;
569 FT_Bool kernVariation;
575 /* reserved bits = 0 */
576 if ( coverage & 0x1FFC )
579 #ifdef GXV_LOAD_TRACE_VARS
580 kernVertical = FT_BOOL( ( coverage >> 15 ) & 1 );
581 kernCrossStream = FT_BOOL( ( coverage >> 14 ) & 1 );
582 kernVariation = FT_BOOL( ( coverage >> 13 ) & 1 );
585 *format = (FT_UShort)( coverage & 0x0003 );
587 GXV_TRACE(( "new Apple-dialect: "
588 "horizontal=%d, cross-stream=%d, variation=%d, format=%d\n",
589 !kernVertical, kernCrossStream, kernVariation, *format ));
591 GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
598 gxv_kern_coverage_classic_apple_validate( FT_UShort coverage,
600 GXV_Validator valid )
602 /* classic Apple-dialect */
603 #ifdef GXV_LOAD_TRACE_VARS
605 FT_Bool cross_stream;
609 /* check expected flags, but don't check if MS-dialect is impossible */
610 if ( !( coverage & 0xFD00 ) && KERN_ALLOWS_MS( valid ) )
613 /* reserved bits = 0 */
614 if ( coverage & 0x02FC )
617 #ifdef GXV_LOAD_TRACE_VARS
618 horizontal = FT_BOOL( ( coverage >> 15 ) & 1 );
619 cross_stream = FT_BOOL( ( coverage >> 13 ) & 1 );
622 *format = (FT_UShort)( coverage & 0x0003 );
624 GXV_TRACE(( "classic Apple-dialect: "
625 "horizontal=%d, cross-stream=%d, format=%d\n",
626 horizontal, cross_stream, *format ));
628 /* format 1 requires GX State Machine, too new for classic */
632 GXV_TRACE(( "kerning values in Apple format subtable are ignored\n" ));
639 gxv_kern_coverage_classic_microsoft_validate( FT_UShort coverage,
641 GXV_Validator valid )
643 /* classic Microsoft-dialect */
644 #ifdef GXV_LOAD_TRACE_VARS
647 FT_Bool cross_stream;
654 /* reserved bits = 0 */
655 if ( coverage & 0xFDF0 )
658 #ifdef GXV_LOAD_TRACE_VARS
659 horizontal = FT_BOOL( coverage & 1 );
660 minimum = FT_BOOL( ( coverage >> 1 ) & 1 );
661 cross_stream = FT_BOOL( ( coverage >> 2 ) & 1 );
662 override = FT_BOOL( ( coverage >> 3 ) & 1 );
665 *format = (FT_UShort)( ( coverage >> 8 ) & 0x0003 );
667 GXV_TRACE(( "classic Microsoft-dialect: "
668 "horizontal=%d, minimum=%d, cross-stream=%d, "
669 "override=%d, format=%d\n",
670 horizontal, minimum, cross_stream, override, *format ));
674 "kerning values in Microsoft format 2 subtable are ignored\n" ));
680 /*************************************************************************/
681 /*************************************************************************/
685 /*************************************************************************/
686 /*************************************************************************/
688 static GXV_kern_Dialect
689 gxv_kern_coverage_validate( FT_UShort coverage,
691 GXV_Validator valid )
693 GXV_kern_Dialect result = KERN_DIALECT_UNKNOWN;
696 GXV_NAME_ENTER( "validating coverage" );
698 GXV_TRACE(( "interprete coverage 0x%04x by Apple style\n", coverage ));
700 if ( KERN_IS_NEW( valid ) )
702 if ( gxv_kern_coverage_new_apple_validate( coverage,
706 result = KERN_DIALECT_APPLE;
711 if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_APPLE( valid ) )
713 if ( gxv_kern_coverage_classic_apple_validate( coverage,
717 result = KERN_DIALECT_APPLE;
722 if ( KERN_IS_CLASSIC( valid ) && KERN_ALLOWS_MS( valid ) )
724 if ( gxv_kern_coverage_classic_microsoft_validate( coverage,
728 result = KERN_DIALECT_MS;
733 GXV_TRACE(( "cannot interprete coverage, broken kern subtable\n" ));
742 gxv_kern_subtable_validate( FT_Bytes table,
744 GXV_Validator valid )
747 #ifdef GXV_LOAD_TRACE_VARS
748 FT_UShort version = 0; /* MS only: subtable version, unused */
750 FT_ULong length; /* MS: 16bit, Apple: 32bit*/
752 #ifdef GXV_LOAD_TRACE_VARS
753 FT_UShort tupleIndex = 0; /* Apple only */
756 FT_UShort format = 255; /* subtable format */
759 GXV_NAME_ENTER( "kern subtable" );
761 GXV_LIMIT_CHECK( 2 + 2 + 2 );
762 u16[0] = FT_NEXT_USHORT( p ); /* Apple: length_hi MS: version */
763 u16[1] = FT_NEXT_USHORT( p ); /* Apple: length_lo MS: length */
764 coverage = FT_NEXT_USHORT( p );
766 switch ( gxv_kern_coverage_validate( coverage, &format, valid ) )
768 case KERN_DIALECT_MS:
769 #ifdef GXV_LOAD_TRACE_VARS
773 #ifdef GXV_LOAD_TRACE_VARS
776 GXV_TRACE(( "Subtable version = %d\n", version ));
777 GXV_TRACE(( "Subtable length = %d\n", length ));
780 case KERN_DIALECT_APPLE:
781 #ifdef GXV_LOAD_TRACE_VARS
784 length = ( u16[0] << 16 ) + u16[1];
785 #ifdef GXV_LOAD_TRACE_VARS
788 GXV_TRACE(( "Subtable length = %d\n", length ));
790 if ( KERN_IS_NEW( valid ) )
792 GXV_LIMIT_CHECK( 2 );
793 #ifdef GXV_LOAD_TRACE_VARS
794 tupleIndex = FT_NEXT_USHORT( p );
798 GXV_TRACE(( "Subtable tupleIndex = %d\n", tupleIndex ));
804 GXV_TRACE(( "cannot detect subtable dialect, "
805 "just skip %d byte\n", length ));
809 /* formats 1, 2, 3 require the position of the start of this subtable */
811 gxv_kern_subtable_fmt0_validate( table, table + length, valid );
812 else if ( format == 1 )
813 gxv_kern_subtable_fmt1_validate( table, table + length, valid );
814 else if ( format == 2 )
815 gxv_kern_subtable_fmt2_validate( table, table + length, valid );
816 else if ( format == 3 )
817 gxv_kern_subtable_fmt3_validate( table, table + length, valid );
822 valid->subtable_length = length;
827 /*************************************************************************/
828 /*************************************************************************/
830 /***** kern TABLE *****/
832 /*************************************************************************/
833 /*************************************************************************/
836 gxv_kern_validate_generic( FT_Bytes table,
838 FT_Bool classic_only,
839 GXV_kern_Dialect dialect_request,
840 FT_Validator ftvalid )
842 GXV_ValidatorRec validrec;
843 GXV_Validator valid = &validrec;
845 GXV_kern_DataRec kernrec;
846 GXV_kern_Data kern = &kernrec;
851 FT_ULong nTables = 0;
855 valid->root = ftvalid;
856 valid->table_data = kern;
859 FT_TRACE3(( "validating `kern' table\n" ));
861 KERN_DIALECT( valid ) = dialect_request;
863 GXV_LIMIT_CHECK( 2 );
864 GXV_KERN_DATA( version ) = (GXV_kern_Version)FT_NEXT_USHORT( p );
865 GXV_TRACE(( "version 0x%04x (higher 16bit)\n",
866 GXV_KERN_DATA( version ) ));
868 if ( 0x0001 < GXV_KERN_DATA( version ) )
870 else if ( KERN_IS_CLASSIC( valid ) )
872 GXV_LIMIT_CHECK( 2 );
873 nTables = FT_NEXT_USHORT( p );
875 else if ( KERN_IS_NEW( valid ) )
880 if ( 0x0000 != FT_NEXT_USHORT( p ) )
883 GXV_LIMIT_CHECK( 4 );
884 nTables = FT_NEXT_ULONG( p );
887 for ( i = 0; i < nTables; i++ )
889 GXV_TRACE(( "validating subtable %d/%d\n", i, nTables ));
890 /* p should be 32bit-aligned? */
891 gxv_kern_subtable_validate( p, 0, valid );
892 p += valid->subtable_length;
900 gxv_kern_validate( FT_Bytes table,
902 FT_Validator ftvalid )
904 gxv_kern_validate_generic( table, face, 0, KERN_DIALECT_ANY, ftvalid );
909 gxv_kern_validate_classic( FT_Bytes table,
911 FT_Int dialect_flags,
912 FT_Validator ftvalid )
914 GXV_kern_Dialect dialect_request;
917 dialect_request = (GXV_kern_Dialect)dialect_flags;
918 gxv_kern_validate_generic( table, face, 1, dialect_request, ftvalid );