1/****************************************************************************
2 *
3 * gxvmorx5.c
4 *
5 * TrueTypeGX/AAT morx table validation
6 * body for type5 (Contextual Glyph Insertion) 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 /*
43 * `morx' subtable type5 (Contextual Glyph Insertion)
44 * has format of a StateTable with insertion-glyph-list
45 * without name. However, the 32bit offset from the head
46 * of subtable to the i-g-l is given after `entryTable',
47 * without variable name specification (the existence of
48 * this offset to the table is different from mort type5).
49 */
50
51
52 typedef struct GXV_morx_subtable_type5_StateOptRec_
53 {
54 FT_ULong insertionGlyphList;
55 FT_ULong insertionGlyphList_length;
56
57 } GXV_morx_subtable_type5_StateOptRec,
58 *GXV_morx_subtable_type5_StateOptRecData;
59
60
61#define GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE \
62 ( GXV_STATETABLE_HEADER_SIZE + 4 )
63
64
65 static void
66 gxv_morx_subtable_type5_insertionGlyphList_load( FT_Bytes table,
67 FT_Bytes limit,
68 GXV_Validator gxvalid )
69 {
70 FT_Bytes p = table;
71
72 GXV_morx_subtable_type5_StateOptRecData optdata =
73 (GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata;
74
75
76 GXV_LIMIT_CHECK( 4 );
77 optdata->insertionGlyphList = FT_NEXT_ULONG( p );
78 }
79
80
81 static void
82 gxv_morx_subtable_type5_subtable_setup( FT_ULong table_size,
83 FT_ULong classTable,
84 FT_ULong stateArray,
85 FT_ULong entryTable,
86 FT_ULong* classTable_length_p,
87 FT_ULong* stateArray_length_p,
88 FT_ULong* entryTable_length_p,
89 GXV_Validator gxvalid )
90 {
91 FT_ULong o[4];
92 FT_ULong* l[4];
93 FT_ULong buff[5];
94
95 GXV_morx_subtable_type5_StateOptRecData optdata =
96 (GXV_morx_subtable_type5_StateOptRecData)gxvalid->xstatetable.optdata;
97
98
99 o[0] = classTable;
100 o[1] = stateArray;
101 o[2] = entryTable;
102 o[3] = optdata->insertionGlyphList;
103 l[0] = classTable_length_p;
104 l[1] = stateArray_length_p;
105 l[2] = entryTable_length_p;
106 l[3] = &(optdata->insertionGlyphList_length);
107
108 gxv_set_length_by_ulong_offset( o, l, buff, 4, table_size, gxvalid );
109 }
110
111
112 static void
113 gxv_morx_subtable_type5_InsertList_validate( FT_UShort table_index,
114 FT_UShort count,
115 FT_Bytes table,
116 FT_Bytes limit,
117 GXV_Validator gxvalid )
118 {
119 FT_Bytes p = table + table_index * 2;
120
121
122#ifndef GXV_LOAD_TRACE_VARS
123 GXV_LIMIT_CHECK( count * 2 );
124#else
125 while ( p < table + count * 2 + table_index * 2 )
126 {
127 FT_UShort insert_glyphID;
128
129
130 GXV_LIMIT_CHECK( 2 );
131 insert_glyphID = FT_NEXT_USHORT( p );
132 GXV_TRACE(( " 0x%04x", insert_glyphID ));
133 }
134
135 GXV_TRACE(( "\n" ));
136#endif
137 }
138
139
140 static void
141 gxv_morx_subtable_type5_entry_validate(
142 FT_UShort state,
143 FT_UShort flags,
144 GXV_StateTable_GlyphOffsetCPtr glyphOffset_p,
145 FT_Bytes table,
146 FT_Bytes limit,
147 GXV_Validator gxvalid )
148 {
149#ifdef GXV_LOAD_UNUSED_VARS
150 FT_Bool setMark;
151 FT_Bool dontAdvance;
152 FT_Bool currentIsKashidaLike;
153 FT_Bool markedIsKashidaLike;
154 FT_Bool currentInsertBefore;
155 FT_Bool markedInsertBefore;
156#endif
157 FT_Byte currentInsertCount;
158 FT_Byte markedInsertCount;
159 FT_Byte currentInsertList;
160 FT_UShort markedInsertList;
161
162 FT_UNUSED( state );
163
164
165#ifdef GXV_LOAD_UNUSED_VARS
166 setMark = FT_BOOL( ( flags >> 15 ) & 1 );
167 dontAdvance = FT_BOOL( ( flags >> 14 ) & 1 );
168 currentIsKashidaLike = FT_BOOL( ( flags >> 13 ) & 1 );
169 markedIsKashidaLike = FT_BOOL( ( flags >> 12 ) & 1 );
170 currentInsertBefore = FT_BOOL( ( flags >> 11 ) & 1 );
171 markedInsertBefore = FT_BOOL( ( flags >> 10 ) & 1 );
172#endif
173
174 currentInsertCount = (FT_Byte)( ( flags >> 5 ) & 0x1F );
175 markedInsertCount = (FT_Byte)( flags & 0x001F );
176
177 currentInsertList = (FT_Byte) ( glyphOffset_p->ul >> 16 );
178 markedInsertList = (FT_UShort)( glyphOffset_p->ul );
179
180 if ( currentInsertList && 0 != currentInsertCount )
181 gxv_morx_subtable_type5_InsertList_validate( currentInsertList,
182 currentInsertCount,
183 table, limit,
184 gxvalid );
185
186 if ( markedInsertList && 0 != markedInsertCount )
187 gxv_morx_subtable_type5_InsertList_validate( markedInsertList,
188 markedInsertCount,
189 table, limit,
190 gxvalid );
191 }
192
193
194 FT_LOCAL_DEF( void )
195 gxv_morx_subtable_type5_validate( FT_Bytes table,
196 FT_Bytes limit,
197 GXV_Validator gxvalid )
198 {
199 FT_Bytes p = table;
200
201 GXV_morx_subtable_type5_StateOptRec et_rec;
202 GXV_morx_subtable_type5_StateOptRecData et = &et_rec;
203
204
205 GXV_NAME_ENTER( "morx chain subtable type5 (Glyph Insertion)" );
206
207 GXV_LIMIT_CHECK( GXV_MORX_SUBTABLE_TYPE5_HEADER_SIZE );
208
209 gxvalid->xstatetable.optdata =
210 et;
211 gxvalid->xstatetable.optdata_load_func =
212 gxv_morx_subtable_type5_insertionGlyphList_load;
213 gxvalid->xstatetable.subtable_setup_func =
214 gxv_morx_subtable_type5_subtable_setup;
215 gxvalid->xstatetable.entry_glyphoffset_fmt =
216 GXV_GLYPHOFFSET_ULONG;
217 gxvalid->xstatetable.entry_validate_func =
218 gxv_morx_subtable_type5_entry_validate;
219
220 gxv_XStateTable_validate( p, limit, gxvalid );
221
222 GXV_EXIT;
223 }
224
225
226/* END */
227