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;
68 friend struct TTCHeader;
70 STATIC_DEFINE_GET_FOR_DATA (OffsetTable);
72 inline unsigned int get_table_count (void) const
74 inline const Tag& get_table_tag (unsigned int i) const
76 if (HB_UNLIKELY (i >= numTables)) return Null(Tag);
77 return tableDir[i].tag;
79 inline const TableDirectory& get_table (unsigned int i) const
81 if (HB_UNLIKELY (i >= numTables)) return Null(TableDirectory);
84 inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
89 unsigned int count = numTables;
90 for (unsigned int i = 0; i < count; i++)
92 if (t == tableDir[i].tag)
94 if (table_index) *table_index = i;
98 if (table_index) *table_index = NO_INDEX;
101 inline const TableDirectory& get_table_by_tag (hb_tag_t tag) const
103 unsigned int table_index;
104 find_table_index (tag, &table_index);
105 return get_table (table_index);
108 inline unsigned int get_face_count (void) const { return 1; }
111 inline bool sanitize (SANITIZE_ARG_DEF, void *base) {
113 if (!(SANITIZE_SELF () && SANITIZE_ARRAY (tableDir, TableDirectory::get_size (), numTables))) return false;
115 /* No need to check tables individually since we don't sanitize the
116 * referenced table, just the table directory. Code retaind to make
117 * sure TableDirectory has a baseless sanitize(). */
118 unsigned int count = numTables;
119 for (unsigned int i = 0; i < count; i++)
120 if (!SANITIZE (tableDir[i]))
126 Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
127 USHORT numTables; /* Number of tables. */
128 USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
129 USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
130 USHORT rangeShift; /* NumTables x 16-searchRange. */
131 TableDirectory tableDir[VAR]; /* TableDirectory entries. numTables items */
133 ASSERT_SIZE_VAR (OffsetTable, 12, TableDirectory);
136 * TrueType Collections
141 friend struct OpenTypeFontFile;
143 STATIC_DEFINE_GET_FOR_DATA_CHECK_MAJOR_VERSION (TTCHeader, 1, 2);
145 inline unsigned int get_face_count (void) const { return table.len; }
147 inline const OpenTypeFontFace& get_face (unsigned int i) const
149 return this+table[i];
152 inline bool sanitize (SANITIZE_ARG_DEF) {
154 if (!SANITIZE (version)) return false;
155 if (version.major < 1 || version.major > 2) return true;
156 return table.sanitize (SANITIZE_ARG, CharP(this), CharP(this));
160 Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
161 FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
162 * 0x00010000 or 0x00020000 */
163 LongOffsetLongArrayOf<OffsetTable>
164 table; /* Array of offsets to the OffsetTable for each font
165 * from the beginning of the file */
167 ASSERT_SIZE (TTCHeader, 12);
174 struct OpenTypeFontFile
176 static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 );
177 static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O');
178 static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f');
180 STATIC_DEFINE_GET_FOR_DATA (OpenTypeFontFile);
182 inline unsigned int get_face_count (void) const
186 case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CharP(this)).get_face_count ();
187 case TTCTag: return TTCHeader::get_for_data (CharP(this)).get_face_count ();
190 inline const OpenTypeFontFace& get_face (unsigned int i) const
193 default: return Null(OpenTypeFontFace);
194 /* Note: for non-collection SFNT data we ignore index. This is because
195 * Apple dfont container is a container of SFNT's. So each SFNT is a
196 * non-TTC, but the index is more than zero. */
197 case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CharP(this));
198 case TTCTag: return TTCHeader::get_for_data (CharP(this)).get_face (i);
202 /* This is how you get a table */
203 inline const char* get_table_data (const OpenTypeTable& table) const
205 if (HB_UNLIKELY (table.offset == 0)) return NULL;
206 return CharP(this) + table.offset;
209 inline bool sanitize (SANITIZE_ARG_DEF) {
211 if (!SANITIZE_SELF ()) return false;
213 default: return true;
214 case TrueTypeTag: case CFFTag: return SANITIZE_THIS (CAST (OffsetTable, *this, 0));
215 case TTCTag: return SANITIZE (CAST (TTCHeader, *this, 0));
219 Tag tag; /* 4-byte identifier. */
221 ASSERT_SIZE (OpenTypeFontFile, 4);
224 #endif /* HB_OPEN_FILE_PRIVATE_HH */