1 | /**************************************************************************** |
2 | * |
3 | * gxvmort0.c |
4 | * |
5 | * TrueTypeGX/AAT mort table validation |
6 | * body for type0 (Indic Script Rearrangement) subtable. |
7 | * |
8 | * Copyright (C) 2005-2023 by |
9 | * suzuki toshiya, Masatake YAMATO, Red Hat K.K., |
10 | * David Turner, Robert Wilhelm, and Werner Lemberg. |
11 | * |
12 | * This file is part of the FreeType project, and may only be used, |
13 | * modified, and distributed under the terms of the FreeType project |
14 | * license, LICENSE.TXT. By continuing to use, modify, or distribute |
15 | * this file you indicate that you have read the license and |
16 | * understand and accept it fully. |
17 | * |
18 | */ |
19 | |
20 | /**************************************************************************** |
21 | * |
22 | * gxvalid is derived from both gxlayout module and otvalid module. |
23 | * Development of gxlayout is supported by the Information-technology |
24 | * Promotion Agency(IPA), Japan. |
25 | * |
26 | */ |
27 | |
28 | |
29 | #include "gxvmort.h" |
30 | |
31 | |
32 | /************************************************************************** |
33 | * |
34 | * The macro FT_COMPONENT is used in trace mode. It is an implicit |
35 | * parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log |
36 | * messages during execution. |
37 | */ |
38 | #undef FT_COMPONENT |
39 | #define FT_COMPONENT gxvmort |
40 | |
41 | |
42 | static const char* GXV_Mort_IndicScript_Msg[] = |
43 | { |
44 | "no change" , |
45 | "Ax => xA" , |
46 | "xD => Dx" , |
47 | "AxD => DxA" , |
48 | "ABx => xAB" , |
49 | "ABx => xBA" , |
50 | "xCD => CDx" , |
51 | "xCD => DCx" , |
52 | "AxCD => CDxA" , |
53 | "AxCD => DCxA" , |
54 | "ABxD => DxAB" , |
55 | "ABxD => DxBA" , |
56 | "ABxCD => CDxAB" , |
57 | "ABxCD => CDxBA" , |
58 | "ABxCD => DCxAB" , |
59 | "ABxCD => DCxBA" , |
60 | |
61 | }; |
62 | |
63 | |
64 | static void |
65 | gxv_mort_subtable_type0_entry_validate( |
66 | FT_Byte state, |
67 | FT_UShort flags, |
68 | GXV_StateTable_GlyphOffsetCPtr glyphOffset_p, |
69 | FT_Bytes table, |
70 | FT_Bytes limit, |
71 | GXV_Validator gxvalid ) |
72 | { |
73 | FT_UShort markFirst; |
74 | FT_UShort dontAdvance; |
75 | FT_UShort markLast; |
76 | FT_UShort reserved; |
77 | FT_UShort verb = 0; |
78 | |
79 | FT_UNUSED( state ); |
80 | FT_UNUSED( table ); |
81 | FT_UNUSED( limit ); |
82 | |
83 | FT_UNUSED( GXV_Mort_IndicScript_Msg[verb] ); /* for the non-debugging */ |
84 | FT_UNUSED( glyphOffset_p ); /* case */ |
85 | |
86 | |
87 | markFirst = (FT_UShort)( ( flags >> 15 ) & 1 ); |
88 | dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
89 | markLast = (FT_UShort)( ( flags >> 13 ) & 1 ); |
90 | |
91 | reserved = (FT_UShort)( flags & 0x1FF0 ); |
92 | verb = (FT_UShort)( flags & 0x000F ); |
93 | |
94 | GXV_TRACE(( " IndicScript MorphRule for glyphOffset 0x%04x" , |
95 | glyphOffset_p->u )); |
96 | GXV_TRACE(( " markFirst=%01d" , markFirst )); |
97 | GXV_TRACE(( " dontAdvance=%01d" , dontAdvance )); |
98 | GXV_TRACE(( " markLast=%01d" , markLast )); |
99 | GXV_TRACE(( " %02d" , verb )); |
100 | GXV_TRACE(( " %s\n" , GXV_Mort_IndicScript_Msg[verb] )); |
101 | |
102 | if ( markFirst > 0 && markLast > 0 ) |
103 | { |
104 | GXV_TRACE(( " [odd] a glyph is marked as the first and last" |
105 | " in Indic rearrangement\n" )); |
106 | GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); |
107 | } |
108 | |
109 | if ( markFirst > 0 && dontAdvance > 0 ) |
110 | { |
111 | GXV_TRACE(( " [odd] the first glyph is marked as dontAdvance" |
112 | " in Indic rearrangement\n" )); |
113 | GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); |
114 | } |
115 | |
116 | if ( 0 < reserved ) |
117 | { |
118 | GXV_TRACE(( " non-zero bits found in reserved range\n" )); |
119 | GXV_SET_ERR_IF_PARANOID( FT_INVALID_DATA ); |
120 | } |
121 | else |
122 | GXV_TRACE(( "\n" )); |
123 | } |
124 | |
125 | |
126 | FT_LOCAL_DEF( void ) |
127 | gxv_mort_subtable_type0_validate( FT_Bytes table, |
128 | FT_Bytes limit, |
129 | GXV_Validator gxvalid ) |
130 | { |
131 | FT_Bytes p = table; |
132 | |
133 | |
134 | GXV_NAME_ENTER( |
135 | "mort chain subtable type0 (Indic-Script Rearrangement)" ); |
136 | |
137 | GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE ); |
138 | |
139 | gxvalid->statetable.optdata = NULL; |
140 | gxvalid->statetable.optdata_load_func = NULL; |
141 | gxvalid->statetable.subtable_setup_func = NULL; |
142 | gxvalid->statetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE; |
143 | gxvalid->statetable.entry_validate_func = |
144 | gxv_mort_subtable_type0_entry_validate; |
145 | |
146 | gxv_StateTable_validate( p, limit, gxvalid ); |
147 | |
148 | GXV_EXIT; |
149 | } |
150 | |
151 | |
152 | /* END */ |
153 | |