1 /***************************************************************************/
5 /* TrueTypeGX/AAT mort table validation (body). */
7 /* Copyright 2005, 2013 by suzuki toshiya, Masatake YAMATO, Red Hat K.K., */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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. */
16 /***************************************************************************/
18 /***************************************************************************/
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. */
24 /***************************************************************************/
31 /*************************************************************************/
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. */
38 #define FT_COMPONENT trace_gxvmort
42 gxv_mort_feature_validate( GXV_mort_feature f
,
45 if ( f
->featureType
>= gxv_feat_registry_length
)
47 GXV_TRACE(( "featureType %d is out of registered range, "
48 "setting %d is unchecked\n",
49 f
->featureType
, f
->featureSetting
));
50 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA
);
52 else if ( !gxv_feat_registry
[f
->featureType
].existence
)
54 GXV_TRACE(( "featureType %d is within registered area "
55 "but undefined, setting %d is unchecked\n",
56 f
->featureType
, f
->featureSetting
));
57 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA
);
61 FT_Byte nSettings_max
;
64 /* nSettings in gxvfeat.c is halved for exclusive on/off settings */
65 nSettings_max
= gxv_feat_registry
[f
->featureType
].nSettings
;
66 if ( gxv_feat_registry
[f
->featureType
].exclusive
)
67 nSettings_max
= (FT_Byte
)( 2 * nSettings_max
);
69 GXV_TRACE(( "featureType %d is registered", f
->featureType
));
70 GXV_TRACE(( "setting %d", f
->featureSetting
));
72 if ( f
->featureSetting
> nSettings_max
)
74 GXV_TRACE(( "out of defined range %d", nSettings_max
));
75 GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA
);
80 /* TODO: enableFlags must be unique value in specified chain? */
85 * nFeatureFlags is typed to FT_ULong to accept that in
86 * mort (typed FT_UShort) and morx (typed FT_ULong).
89 gxv_mort_featurearray_validate( FT_Bytes table
,
91 FT_ULong nFeatureFlags
,
97 GXV_mort_featureRec f
= GXV_MORT_FEATURE_OFF
;
100 GXV_NAME_ENTER( "mort feature list" );
101 for ( i
= 0; i
< nFeatureFlags
; i
++ )
103 GXV_LIMIT_CHECK( 2 + 2 + 4 + 4 );
104 f
.featureType
= FT_NEXT_USHORT( p
);
105 f
.featureSetting
= FT_NEXT_USHORT( p
);
106 f
.enableFlags
= FT_NEXT_ULONG( p
);
107 f
.disableFlags
= FT_NEXT_ULONG( p
);
109 gxv_mort_feature_validate( &f
, valid
);
112 if ( !IS_GXV_MORT_FEATURE_OFF( f
) )
115 valid
->subtable_length
= p
- table
;
121 gxv_mort_coverage_validate( FT_UShort coverage
,
122 GXV_Validator valid
)
126 #ifdef FT_DEBUG_LEVEL_TRACE
127 if ( coverage
& 0x8000U
)
128 GXV_TRACE(( " this subtable is for vertical text only\n" ));
130 GXV_TRACE(( " this subtable is for horizontal text only\n" ));
132 if ( coverage
& 0x4000 )
133 GXV_TRACE(( " this subtable is applied to glyph array "
134 "in descending order\n" ));
136 GXV_TRACE(( " this subtable is applied to glyph array "
137 "in ascending order\n" ));
139 if ( coverage
& 0x2000 )
140 GXV_TRACE(( " this subtable is forcibly applied to "
141 "vertical/horizontal text\n" ));
143 if ( coverage
& 0x1FF8 )
144 GXV_TRACE(( " coverage has non-zero bits in reserved area\n" ));
150 gxv_mort_subtables_validate( FT_Bytes table
,
152 FT_UShort nSubtables
,
153 GXV_Validator valid
)
157 GXV_Validate_Func fmt_funcs_table
[] =
159 gxv_mort_subtable_type0_validate
, /* 0 */
160 gxv_mort_subtable_type1_validate
, /* 1 */
161 gxv_mort_subtable_type2_validate
, /* 2 */
163 gxv_mort_subtable_type4_validate
, /* 4 */
164 gxv_mort_subtable_type5_validate
, /* 5 */
171 GXV_NAME_ENTER( "subtables in a chain" );
173 for ( i
= 0; i
< nSubtables
; i
++ )
175 GXV_Validate_Func func
;
179 #ifdef GXV_LOAD_UNUSED_VARS
180 FT_ULong subFeatureFlags
;
186 GXV_LIMIT_CHECK( 2 + 2 + 4 );
187 length
= FT_NEXT_USHORT( p
);
188 coverage
= FT_NEXT_USHORT( p
);
189 #ifdef GXV_LOAD_UNUSED_VARS
190 subFeatureFlags
= FT_NEXT_ULONG( p
);
195 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
196 i
+ 1, nSubtables
, length
));
197 type
= coverage
& 0x0007;
198 rest
= length
- ( 2 + 2 + 4 );
200 GXV_LIMIT_CHECK( rest
);
201 gxv_mort_coverage_validate( coverage
, valid
);
206 func
= fmt_funcs_table
[type
];
208 GXV_TRACE(( "morx type %d is reserved\n", type
));
210 func( p
, p
+ rest
, valid
);
213 /* TODO: validate subFeatureFlags */
216 valid
->subtable_length
= p
- table
;
223 gxv_mort_chain_validate( FT_Bytes table
,
225 GXV_Validator valid
)
228 #ifdef GXV_LOAD_UNUSED_VARS
229 FT_ULong defaultFlags
;
231 FT_ULong chainLength
;
232 FT_UShort nFeatureFlags
;
233 FT_UShort nSubtables
;
236 GXV_NAME_ENTER( "mort chain header" );
238 GXV_LIMIT_CHECK( 4 + 4 + 2 + 2 );
239 #ifdef GXV_LOAD_UNUSED_VARS
240 defaultFlags
= FT_NEXT_ULONG( p
);
244 chainLength
= FT_NEXT_ULONG( p
);
245 nFeatureFlags
= FT_NEXT_USHORT( p
);
246 nSubtables
= FT_NEXT_USHORT( p
);
248 gxv_mort_featurearray_validate( p
, table
+ chainLength
,
249 nFeatureFlags
, valid
);
250 p
+= valid
->subtable_length
;
251 gxv_mort_subtables_validate( p
, table
+ chainLength
, nSubtables
, valid
);
252 valid
->subtable_length
= chainLength
;
254 /* TODO: validate defaultFlags */
260 gxv_mort_validate( FT_Bytes table
,
262 FT_Validator ftvalid
)
264 GXV_ValidatorRec validrec
;
265 GXV_Validator valid
= &validrec
;
273 valid
->root
= ftvalid
;
275 limit
= valid
->root
->limit
;
277 FT_TRACE3(( "validating `mort' table\n" ));
280 GXV_LIMIT_CHECK( 4 + 4 );
281 version
= FT_NEXT_ULONG( p
);
282 nChains
= FT_NEXT_ULONG( p
);
284 if (version
!= 0x00010000UL
)
287 for ( i
= 0; i
< nChains
; i
++ )
289 GXV_TRACE(( "validating chain %d/%d\n", i
+ 1, nChains
));
290 GXV_32BIT_ALIGNMENT_VALIDATE( p
- table
);
291 gxv_mort_chain_validate( p
, limit
, valid
);
292 p
+= valid
->subtable_length
;