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;
49 typedef struct TableDirectory
51 inline bool sanitize (hb_sanitize_context_t *context) {
53 return context->check_struct (this);
56 Tag tag; /* 4-byte identifier. */
57 CheckSum checkSum; /* CheckSum for this table. */
58 ULONG offset; /* Offset from beginning of TrueType font
60 ULONG length; /* Length of this table. */
62 DEFINE_SIZE_STATIC (16);
65 typedef struct OffsetTable
67 friend struct OpenTypeFontFile;
69 inline unsigned int get_table_count (void) const
71 inline const TableDirectory& get_table (unsigned int i) const
73 if (unlikely (i >= numTables)) return Null(TableDirectory);
76 inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
80 /* TODO: bsearch (need to sort in sanitize) */
81 unsigned int count = numTables;
82 for (unsigned int i = 0; i < count; i++)
84 if (t == tableDir[i].tag)
86 if (table_index) *table_index = i;
90 if (table_index) *table_index = Index::NOT_FOUND_INDEX;
93 inline const TableDirectory& get_table_by_tag (hb_tag_t tag) const
95 unsigned int table_index;
96 find_table_index (tag, &table_index);
97 return get_table (table_index);
101 inline bool sanitize (hb_sanitize_context_t *context) {
103 return context->check_struct (this)
104 && context->check_array (tableDir, TableDirectory::static_size, numTables);
108 Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
109 USHORT numTables; /* Number of tables. */
110 USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
111 USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
112 USHORT rangeShift; /* NumTables x 16-searchRange. */
113 TableDirectory tableDir[VAR]; /* TableDirectory entries. numTables items */
115 DEFINE_SIZE_ARRAY (12, tableDir);
120 * TrueType Collections
123 struct TTCHeaderVersion1
125 friend struct TTCHeader;
127 inline unsigned int get_face_count (void) const { return table.len; }
128 inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
130 inline bool sanitize (hb_sanitize_context_t *context) {
132 return table.sanitize (context, this);
136 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
137 FixedVersion version; /* Version of the TTC Header (1.0),
139 LongOffsetLongArrayOf<OffsetTable>
140 table; /* Array of offsets to the OffsetTable for each font
141 * from the beginning of the file */
143 DEFINE_SIZE_ARRAY (12, table);
148 friend struct OpenTypeFontFile;
152 inline unsigned int get_face_count (void) const
154 switch (u.header.version) {
155 case 2: /* version 2 is compatible with version 1 */
156 case 1: return u.version1.get_face_count ();
160 inline const OpenTypeFontFace& get_face (unsigned int i) const
162 switch (u.header.version) {
163 case 2: /* version 2 is compatible with version 1 */
164 case 1: return u.version1.get_face (i);
165 default:return Null(OpenTypeFontFace);
169 inline bool sanitize (hb_sanitize_context_t *context) {
171 if (!u.header.version.sanitize (context)) return false;
172 switch (u.header.version) {
173 case 2: /* version 2 is compatible with version 1 */
174 case 1: return u.version1.sanitize (context);
182 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
183 FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
184 * 0x00010000 or 0x00020000 */
186 TTCHeaderVersion1 version1;
195 struct OpenTypeFontFile
197 static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */
198 static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */
199 static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */
200 static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */
201 static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */
203 inline hb_tag_t get_tag (void) const { return u.tag; }
205 inline unsigned int get_face_count (void) const
208 case CFFTag: /* All the non-collection tags */
211 case TrueTypeTag: return 1;
212 case TTCTag: return u.ttcHeader.get_face_count ();
216 inline const OpenTypeFontFace& get_face (unsigned int i) const
219 /* Note: for non-collection SFNT data we ignore index. This is because
220 * Apple dfont container is a container of SFNT's. So each SFNT is a
221 * non-TTC, but the index is more than zero. */
222 case CFFTag: /* All the non-collection tags */
225 case TrueTypeTag: return u.fontFace;
226 case TTCTag: return u.ttcHeader.get_face (i);
227 default: return Null(OpenTypeFontFace);
231 inline bool sanitize (hb_sanitize_context_t *context) {
233 if (!u.tag.sanitize (context)) return false;
235 case CFFTag: /* All the non-collection tags */
238 case TrueTypeTag: return u.fontFace.sanitize (context);
239 case TTCTag: return u.ttcHeader.sanitize (context);
240 default: return true;
246 Tag tag; /* 4-byte identifier. */
247 OpenTypeFontFace fontFace;
251 DEFINE_SIZE_UNION (4, tag);
255 #endif /* HB_OPEN_FILE_PRIVATE_HH */