1 | /**************************************************************************** |
2 | * |
3 | * gxvmorx0.c |
4 | * |
5 | * TrueTypeGX/AAT morx 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 "gxvmorx.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 gxvmorx |
40 | |
41 | |
42 | static void |
43 | gxv_morx_subtable_type0_entry_validate( |
44 | FT_UShort state, |
45 | FT_UShort flags, |
46 | GXV_XStateTable_GlyphOffsetCPtr glyphOffset_p, |
47 | FT_Bytes table, |
48 | FT_Bytes limit, |
49 | GXV_Validator gxvalid ) |
50 | { |
51 | #ifdef GXV_LOAD_UNUSED_VARS |
52 | FT_UShort markFirst; |
53 | FT_UShort dontAdvance; |
54 | FT_UShort markLast; |
55 | #endif |
56 | FT_UShort reserved; |
57 | #ifdef GXV_LOAD_UNUSED_VARS |
58 | FT_UShort verb; |
59 | #endif |
60 | |
61 | FT_UNUSED( state ); |
62 | FT_UNUSED( glyphOffset_p ); |
63 | FT_UNUSED( table ); |
64 | FT_UNUSED( limit ); |
65 | |
66 | |
67 | #ifdef GXV_LOAD_UNUSED_VARS |
68 | markFirst = (FT_UShort)( ( flags >> 15 ) & 1 ); |
69 | dontAdvance = (FT_UShort)( ( flags >> 14 ) & 1 ); |
70 | markLast = (FT_UShort)( ( flags >> 13 ) & 1 ); |
71 | #endif |
72 | |
73 | reserved = (FT_UShort)( flags & 0x1FF0 ); |
74 | #ifdef GXV_LOAD_UNUSED_VARS |
75 | verb = (FT_UShort)( flags & 0x000F ); |
76 | #endif |
77 | |
78 | if ( 0 < reserved ) |
79 | { |
80 | GXV_TRACE(( " non-zero bits found in reserved range\n" )); |
81 | FT_INVALID_DATA; |
82 | } |
83 | } |
84 | |
85 | |
86 | FT_LOCAL_DEF( void ) |
87 | gxv_morx_subtable_type0_validate( FT_Bytes table, |
88 | FT_Bytes limit, |
89 | GXV_Validator gxvalid ) |
90 | { |
91 | FT_Bytes p = table; |
92 | |
93 | |
94 | GXV_NAME_ENTER( |
95 | "morx chain subtable type0 (Indic-Script Rearrangement)" ); |
96 | |
97 | GXV_LIMIT_CHECK( GXV_STATETABLE_HEADER_SIZE ); |
98 | |
99 | gxvalid->xstatetable.optdata = NULL; |
100 | gxvalid->xstatetable.optdata_load_func = NULL; |
101 | gxvalid->xstatetable.subtable_setup_func = NULL; |
102 | gxvalid->xstatetable.entry_glyphoffset_fmt = GXV_GLYPHOFFSET_NONE; |
103 | gxvalid->xstatetable.entry_validate_func = |
104 | gxv_morx_subtable_type0_entry_validate; |
105 | |
106 | gxv_XStateTable_validate( p, limit, gxvalid ); |
107 | |
108 | GXV_EXIT; |
109 | } |
110 | |
111 | |
112 | /* END */ |
113 | |