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comparison: gfx/harfbuzz/src/hb-open-file-private.hh

gfx/harfbuzz/src/hb-open-file-private.hh

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1 /*
2 * Copyright © 2007,2008,2009 Red Hat, Inc.
3 * Copyright © 2012 Google, Inc.
4 *
5 * This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
27 */
28
29 #ifndef HB_OPEN_FILE_PRIVATE_HH
30 #define HB_OPEN_FILE_PRIVATE_HH
31
32 #include "hb-open-type-private.hh"
33
34
35 namespace OT {
36
37
38 /*
39 *
40 * The OpenType Font File
41 *
42 */
43
44
45 /*
46 * Organization of an OpenType Font
47 */
48
49 struct OpenTypeFontFile;
50 struct OffsetTable;
51 struct TTCHeader;
52
53
54 typedef struct TableRecord
55 {
56 inline bool sanitize (hb_sanitize_context_t *c) {
57 TRACE_SANITIZE (this);
58 return TRACE_RETURN (c->check_struct (this));
59 }
60
61 Tag tag; /* 4-byte identifier. */
62 CheckSum checkSum; /* CheckSum for this table. */
63 ULONG offset; /* Offset from beginning of TrueType font
64 * file. */
65 ULONG length; /* Length of this table. */
66 public:
67 DEFINE_SIZE_STATIC (16);
68 } OpenTypeTable;
69
70 typedef struct OffsetTable
71 {
72 friend struct OpenTypeFontFile;
73
74 inline unsigned int get_table_count (void) const
75 { return numTables; }
76 inline const TableRecord& get_table (unsigned int i) const
77 {
78 if (unlikely (i >= numTables)) return Null(TableRecord);
79 return tables[i];
80 }
81 inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
82 {
83 Tag t;
84 t.set (tag);
85 unsigned int count = numTables;
86 for (unsigned int i = 0; i < count; i++)
87 {
88 if (t == tables[i].tag)
89 {
90 if (table_index) *table_index = i;
91 return true;
92 }
93 }
94 if (table_index) *table_index = Index::NOT_FOUND_INDEX;
95 return false;
96 }
97 inline const TableRecord& get_table_by_tag (hb_tag_t tag) const
98 {
99 unsigned int table_index;
100 find_table_index (tag, &table_index);
101 return get_table (table_index);
102 }
103
104 public:
105 inline bool sanitize (hb_sanitize_context_t *c) {
106 TRACE_SANITIZE (this);
107 return TRACE_RETURN (c->check_struct (this) && c->check_array (tables, TableRecord::static_size, numTables));
108 }
109
110 protected:
111 Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
112 USHORT numTables; /* Number of tables. */
113 USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
114 USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
115 USHORT rangeShift; /* NumTables x 16-searchRange. */
116 TableRecord tables[VAR]; /* TableRecord entries. numTables items */
117 public:
118 DEFINE_SIZE_ARRAY (12, tables);
119 } OpenTypeFontFace;
120
121
122 /*
123 * TrueType Collections
124 */
125
126 struct TTCHeaderVersion1
127 {
128 friend struct TTCHeader;
129
130 inline unsigned int get_face_count (void) const { return table.len; }
131 inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
132
133 inline bool sanitize (hb_sanitize_context_t *c) {
134 TRACE_SANITIZE (this);
135 return TRACE_RETURN (table.sanitize (c, this));
136 }
137
138 protected:
139 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
140 FixedVersion version; /* Version of the TTC Header (1.0),
141 * 0x00010000 */
142 LongOffsetLongArrayOf<OffsetTable>
143 table; /* Array of offsets to the OffsetTable for each font
144 * from the beginning of the file */
145 public:
146 DEFINE_SIZE_ARRAY (12, table);
147 };
148
149 struct TTCHeader
150 {
151 friend struct OpenTypeFontFile;
152
153 private:
154
155 inline unsigned int get_face_count (void) const
156 {
157 switch (u.header.version.major) {
158 case 2: /* version 2 is compatible with version 1 */
159 case 1: return u.version1.get_face_count ();
160 default:return 0;
161 }
162 }
163 inline const OpenTypeFontFace& get_face (unsigned int i) const
164 {
165 switch (u.header.version.major) {
166 case 2: /* version 2 is compatible with version 1 */
167 case 1: return u.version1.get_face (i);
168 default:return Null(OpenTypeFontFace);
169 }
170 }
171
172 inline bool sanitize (hb_sanitize_context_t *c) {
173 TRACE_SANITIZE (this);
174 if (unlikely (!u.header.version.sanitize (c))) return TRACE_RETURN (false);
175 switch (u.header.version.major) {
176 case 2: /* version 2 is compatible with version 1 */
177 case 1: return TRACE_RETURN (u.version1.sanitize (c));
178 default:return TRACE_RETURN (true);
179 }
180 }
181
182 protected:
183 union {
184 struct {
185 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
186 FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
187 * 0x00010000 or 0x00020000 */
188 } header;
189 TTCHeaderVersion1 version1;
190 } u;
191 };
192
193
194 /*
195 * OpenType Font File
196 */
197
198 struct OpenTypeFontFile
199 {
200 static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */
201 static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */
202 static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */
203 static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */
204 static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */
205
206 inline hb_tag_t get_tag (void) const { return u.tag; }
207
208 inline unsigned int get_face_count (void) const
209 {
210 switch (u.tag) {
211 case CFFTag: /* All the non-collection tags */
212 case TrueTag:
213 case Typ1Tag:
214 case TrueTypeTag: return 1;
215 case TTCTag: return u.ttcHeader.get_face_count ();
216 default: return 0;
217 }
218 }
219 inline const OpenTypeFontFace& get_face (unsigned int i) const
220 {
221 switch (u.tag) {
222 /* Note: for non-collection SFNT data we ignore index. This is because
223 * Apple dfont container is a container of SFNT's. So each SFNT is a
224 * non-TTC, but the index is more than zero. */
225 case CFFTag: /* All the non-collection tags */
226 case TrueTag:
227 case Typ1Tag:
228 case TrueTypeTag: return u.fontFace;
229 case TTCTag: return u.ttcHeader.get_face (i);
230 default: return Null(OpenTypeFontFace);
231 }
232 }
233
234 inline bool sanitize (hb_sanitize_context_t *c) {
235 TRACE_SANITIZE (this);
236 if (unlikely (!u.tag.sanitize (c))) return TRACE_RETURN (false);
237 switch (u.tag) {
238 case CFFTag: /* All the non-collection tags */
239 case TrueTag:
240 case Typ1Tag:
241 case TrueTypeTag: return TRACE_RETURN (u.fontFace.sanitize (c));
242 case TTCTag: return TRACE_RETURN (u.ttcHeader.sanitize (c));
243 default: return TRACE_RETURN (true);
244 }
245 }
246
247 protected:
248 union {
249 Tag tag; /* 4-byte identifier. */
250 OpenTypeFontFace fontFace;
251 TTCHeader ttcHeader;
252 } u;
253 public:
254 DEFINE_SIZE_UNION (4, tag);
255 };
256
257
258 } /* namespace OT */
259
260
261 #endif /* HB_OPEN_FILE_PRIVATE_HH */

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