2 * Copyright (C) 2007,2008,2009 Red Hat, Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Red Hat Author(s): Behdad Esfahbod
27 #ifndef HB_OPEN_FILE_PRIVATE_HH
28 #define HB_OPEN_FILE_PRIVATE_HH
30 #include "hb-open-type-private.hh"
35 * The OpenType Font File
41 * Organization of an OpenType Font
44 struct OpenTypeFontFile;
48 typedef struct TableDirectory
50 static inline unsigned int get_size () { return sizeof (TableDirectory); }
52 inline bool sanitize (SANITIZE_ARG_DEF) {
54 return SANITIZE_SELF ();
57 Tag tag; /* 4-byte identifier. */
58 CheckSum checkSum; /* CheckSum for this table. */
59 ULONG offset; /* Offset from beginning of TrueType font
61 ULONG length; /* Length of this table. */
63 ASSERT_SIZE (TableDirectory, 16);
65 typedef struct OffsetTable
67 friend struct OpenTypeFontFile;
69 STATIC_DEFINE_GET_FOR_DATA (OffsetTable);
71 inline unsigned int get_table_count (void) const
73 inline const Tag& get_table_tag (unsigned int i) const
75 if (HB_UNLIKELY (i >= numTables)) return Null(Tag);
76 return tableDir[i].tag;
78 inline const TableDirectory& get_table (unsigned int i) const
80 if (HB_UNLIKELY (i >= numTables)) return Null(TableDirectory);
83 inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
87 /* TODO: bsearch (need to sort in sanitize) */
88 unsigned int count = numTables;
89 for (unsigned int i = 0; i < count; i++)
91 if (t == tableDir[i].tag)
93 if (table_index) *table_index = i;
97 if (table_index) *table_index = NO_INDEX;
100 inline const TableDirectory& get_table_by_tag (hb_tag_t tag) const
102 unsigned int table_index;
103 find_table_index (tag, &table_index);
104 return get_table (table_index);
108 inline bool sanitize (SANITIZE_ARG_DEF) {
110 return SANITIZE_SELF () && SANITIZE_ARRAY (tableDir, TableDirectory::get_size (), numTables);
114 Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
115 USHORT numTables; /* Number of tables. */
116 USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
117 USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
118 USHORT rangeShift; /* NumTables x 16-searchRange. */
119 TableDirectory tableDir[VAR]; /* TableDirectory entries. numTables items */
121 ASSERT_SIZE_VAR (OffsetTable, 12, TableDirectory);
124 * TrueType Collections
127 struct TTCHeaderVersion1
129 friend struct TTCHeader;
131 inline unsigned int get_face_count (void) const { return table.len; }
132 inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
134 inline bool sanitize (SANITIZE_ARG_DEF) {
136 return SANITIZE_THIS (table);
140 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
141 FixedVersion version; /* Version of the TTC Header (1.0),
143 LongOffsetLongArrayOf<OffsetTable>
144 table; /* Array of offsets to the OffsetTable for each font
145 * from the beginning of the file */
147 ASSERT_SIZE (TTCHeaderVersion1, 12);
151 friend struct OpenTypeFontFile;
155 inline unsigned int get_face_count (void) const
157 switch (u.header.version) {
158 case 2: /* version 2 is compatible with version 1 */
159 case 1: return u.version1->get_face_count ();
163 inline const OpenTypeFontFace& get_face (unsigned int i) const
165 switch (u.header.version) {
166 case 2: /* version 2 is compatible with version 1 */
167 case 1: return u.version1->get_face (i);
168 default:return Null(OpenTypeFontFace);
172 inline bool sanitize (SANITIZE_ARG_DEF) {
174 if (!SANITIZE (u.header.version)) return false;
175 switch (u.header.version) {
176 case 2: /* version 2 is compatible with version 1 */
177 case 1: return u.version1->sanitize (SANITIZE_ARG);
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 */
189 TTCHeaderVersion1 version1[VAR];
198 struct OpenTypeFontFile
200 static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O');
201 static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 );
202 static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f');
204 STATIC_DEFINE_GET_FOR_DATA (OpenTypeFontFile);
206 inline hb_tag_t get_tag (void) const { return u.tag; }
208 inline unsigned int get_face_count (void) const
211 case CFFTag: /* All the non-collection tags */
212 case TrueTypeTag: return 1;
213 case TTCTag: return u.ttcHeader->get_face_count ();
217 inline const OpenTypeFontFace& get_face (unsigned int i) const
220 /* Note: for non-collection SFNT data we ignore index. This is because
221 * Apple dfont container is a container of SFNT's. So each SFNT is a
222 * non-TTC, but the index is more than zero. */
223 case CFFTag: /* All the non-collection tags */
224 case TrueTypeTag: return u.fontFace[0];
225 case TTCTag: return u.ttcHeader->get_face (i);
226 default: return Null(OpenTypeFontFace);
230 inline bool sanitize (SANITIZE_ARG_DEF) {
232 if (!SANITIZE (u.tag)) return false;
234 case CFFTag: /* All the non-collection tags */
235 case TrueTypeTag: return u.fontFace->sanitize (SANITIZE_ARG);
236 case TTCTag: return u.ttcHeader->sanitize (SANITIZE_ARG);
237 default: return true;
243 Tag tag; /* 4-byte identifier. */
244 OpenTypeFontFace fontFace[VAR];
245 TTCHeader ttcHeader[VAR];
248 ASSERT_SIZE (OpenTypeFontFile, 4);
251 #endif /* HB_OPEN_FILE_PRIVATE_HH */