1 /***************************************************************************/
5 /* TrueTypeGX/AAT morx table validation (body). */
7 /* Copyright 2005-2018 by */
8 /* 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 /*************************************************************************/
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_gxvmorx
42 gxv_morx_subtables_validate( FT_Bytes table
,
45 GXV_Validator gxvalid
)
49 GXV_Validate_Func fmt_funcs_table
[] =
51 gxv_morx_subtable_type0_validate
, /* 0 */
52 gxv_morx_subtable_type1_validate
, /* 1 */
53 gxv_morx_subtable_type2_validate
, /* 2 */
55 gxv_morx_subtable_type4_validate
, /* 4 */
56 gxv_morx_subtable_type5_validate
, /* 5 */
63 GXV_NAME_ENTER( "subtables in a chain" );
65 for ( i
= 0; i
< nSubtables
; i
++ )
67 GXV_Validate_Func func
;
71 #ifdef GXV_LOAD_UNUSED_VARS
72 FT_ULong subFeatureFlags
;
78 GXV_LIMIT_CHECK( 4 + 4 + 4 );
79 length
= FT_NEXT_ULONG( p
);
80 coverage
= FT_NEXT_ULONG( p
);
81 #ifdef GXV_LOAD_UNUSED_VARS
82 subFeatureFlags
= FT_NEXT_ULONG( p
);
87 GXV_TRACE(( "validating chain subtable %d/%d (%d bytes)\n",
88 i
+ 1, nSubtables
, length
));
90 type
= coverage
& 0x0007;
91 rest
= length
- ( 4 + 4 + 4 );
92 GXV_LIMIT_CHECK( rest
);
94 /* morx coverage consists of mort_coverage & 16bit padding */
95 gxv_mort_coverage_validate( (FT_UShort
)( ( coverage
>> 16 ) | coverage
),
100 func
= fmt_funcs_table
[type
];
102 GXV_TRACE(( "morx type %d is reserved\n", type
));
104 func( p
, p
+ rest
, gxvalid
);
106 /* TODO: subFeatureFlags should be unique in a table? */
110 gxvalid
->subtable_length
= (FT_ULong
)( p
- table
);
117 gxv_morx_chain_validate( FT_Bytes table
,
119 GXV_Validator gxvalid
)
122 #ifdef GXV_LOAD_UNUSED_VARS
123 FT_ULong defaultFlags
;
125 FT_ULong chainLength
;
126 FT_ULong nFeatureFlags
;
130 GXV_NAME_ENTER( "morx chain header" );
132 GXV_LIMIT_CHECK( 4 + 4 + 4 + 4 );
133 #ifdef GXV_LOAD_UNUSED_VARS
134 defaultFlags
= FT_NEXT_ULONG( p
);
138 chainLength
= FT_NEXT_ULONG( p
);
139 nFeatureFlags
= FT_NEXT_ULONG( p
);
140 nSubtables
= FT_NEXT_ULONG( p
);
142 /* feature-array of morx is same with that of mort */
143 gxv_mort_featurearray_validate( p
, limit
, nFeatureFlags
, gxvalid
);
144 p
+= gxvalid
->subtable_length
;
146 if ( nSubtables
>= 0x10000L
)
149 gxv_morx_subtables_validate( p
, table
+ chainLength
,
150 (FT_UShort
)nSubtables
, gxvalid
);
152 gxvalid
->subtable_length
= chainLength
;
154 /* TODO: defaultFlags should be compared with the flags in tables */
161 gxv_morx_validate( FT_Bytes table
,
163 FT_Validator ftvalid
)
165 GXV_ValidatorRec gxvalidrec
;
166 GXV_Validator gxvalid
= &gxvalidrec
;
174 gxvalid
->root
= ftvalid
;
175 gxvalid
->face
= face
;
177 FT_TRACE3(( "validating `morx' table\n" ));
180 GXV_LIMIT_CHECK( 4 + 4 );
181 version
= FT_NEXT_ULONG( p
);
182 nChains
= FT_NEXT_ULONG( p
);
184 if ( version
!= 0x00020000UL
)
187 for ( i
= 0; i
< nChains
; i
++ )
189 GXV_TRACE(( "validating chain %d/%d\n", i
+ 1, nChains
));
190 GXV_32BIT_ALIGNMENT_VALIDATE( p
- table
);
191 gxv_morx_chain_validate( p
, limit
, gxvalid
);
192 p
+= gxvalid
->subtable_length
;