1 /***************************************************************************/
2 /*                                                                         */
3 /*  gxvmort0.c                                                             */
4 /*                                                                         */
5 /*    TrueTypeGX/AAT mort table validation                                 */
6 /*    body for type0 (Indic Script Rearrangement) subtable.                */
7 /*                                                                         */
8 /*  Copyright 2005 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 "gxvmort.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 const char* GXV_Mort_IndicScript_Msg[] =
42   {
43     "no change",
44     "Ax => xA",
45     "xD => Dx",
46     "AxD => DxA",
47     "ABx => xAB",
48     "ABx => xBA",
49     "xCD => CDx",
50     "xCD => DCx",
51     "AxCD => CDxA",
52     "AxCD => DCxA",
53     "ABxD => DxAB",
54     "ABxD => DxBA",
55     "ABxCD => CDxAB",
56     "ABxCD => CDxBA",
57     "ABxCD => DCxAB",
58     "ABxCD => DCxBA",
59 
60   };
61 
62 
63   static void
gxv_mort_subtable_type0_entry_validate(FT_Byte state,FT_UShort flags,GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,FT_Bytes table,FT_Bytes limit,GXV_Validator valid)64   gxv_mort_subtable_type0_entry_validate(
65     FT_Byte                         state,
66     FT_UShort                       flags,
67     GXV_StateTable_GlyphOffsetCPtr  glyphOffset_p,
68     FT_Bytes                        table,
69     FT_Bytes                        limit,
70     GXV_Validator                   valid )
71   {
72     FT_UShort  markFirst;
73     FT_UShort  dontAdvance;
74     FT_UShort  markLast;
75     FT_UShort  reserved;
76     FT_UShort  verb = 0;
77 
78     FT_UNUSED( state );
79     FT_UNUSED( table );
80     FT_UNUSED( limit );
81 
82     FT_UNUSED( GXV_Mort_IndicScript_Msg[verb] ); /* for the non-debugging */
83     FT_UNUSED( glyphOffset_p );                  /* case                  */
84 
85 
86     markFirst   = (FT_UShort)( ( flags >> 15 ) & 1 );
87     dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 );
88     markLast    = (FT_UShort)( ( flags >> 13 ) & 1 );
89 
90     reserved = (FT_UShort)( flags & 0x1FF0 );
91     verb     = (FT_UShort)( flags & 0x000F );
92 
93     GXV_TRACE(( "  IndicScript MorphRule for glyphOffset 0x%04x",
94                 glyphOffset_p->u ));
95     GXV_TRACE(( " markFirst=%01d", markFirst ));
96     GXV_TRACE(( " dontAdvance=%01d", dontAdvance ));
97     GXV_TRACE(( " markLast=%01d", markLast ));
98     GXV_TRACE(( " %02d", verb ));
99     GXV_TRACE(( " %s\n", GXV_Mort_IndicScript_Msg[verb] ));
100 
101     if ( markFirst > 0 && markLast > 0 )
102     {
103       GXV_TRACE(( "  [odd] a glyph is marked as the first and last"
104                   "  in Indic rearrangement\n" ));
105       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
106     }
107 
108     if ( markFirst > 0 && dontAdvance > 0 )
109     {
110       GXV_TRACE(( "  [odd] the first glyph is marked as dontAdvance"
111                   " in Indic rearrangement\n" ));
112       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
113     }
114 
115     if ( 0 < reserved )
116     {
117       GXV_TRACE(( " non-zero bits found in reserved range\n" ));
118       GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA );
119     }
120     else
121       GXV_TRACE(( "\n" ));
122   }
123 
124 
125   FT_LOCAL_DEF( void )
gxv_mort_subtable_type0_validate(FT_Bytes table,FT_Bytes limit,GXV_Validator valid)126   gxv_mort_subtable_type0_validate( FT_Bytes       table,
127                                     FT_Bytes       limit,
128                                     GXV_Validator  valid )
129   {
130     FT_Bytes  p = table;
131 
132 
133     GXV_NAME_ENTER(
134       "mort chain subtable type0 (Indic-Script Rearrangement)" );
135 
136     GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE );
137 
138     valid->statetable.optdata               = NULL;
139     valid->statetable.optdata_load_func     = NULL;
140     valid->statetable.subtable_setup_func   = NULL;
141     valid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE;
142     valid->statetable.entry_validate_func =
143       gxv_mort_subtable_type0_entry_validate;
144 
145     gxv_StateTable_validate( p, limit, valid );
146 
147     GXV_EXIT;
148   }
149 
150 
151 /* END */
152