221 lines
6.5 KiB
C++
221 lines
6.5 KiB
C++
/*
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* Copyright (C) 2007,2008,2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OPEN_FILE_PRIVATE_HH
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#define HB_OPEN_FILE_PRIVATE_HH
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#include "hb-open-type-private.hh"
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/*
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*
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* The OpenType Font File
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*
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*/
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/*
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* Organization of an OpenType Font
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*/
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struct OpenTypeFontFile;
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struct OffsetTable;
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struct TTCHeader;
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typedef struct TableDirectory
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{
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inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
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TRACE_SANITIZE ();
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return SANITIZE_SELF () && SANITIZE (tag) &&
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SANITIZE_MEM (CONST_CHARP(base) + (unsigned long) offset, length);
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}
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Tag tag; /* 4-byte identifier. */
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CheckSum checkSum; /* CheckSum for this table. */
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ULONG offset; /* Offset from beginning of TrueType font
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* file. */
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ULONG length; /* Length of this table. */
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} OpenTypeTable;
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ASSERT_SIZE (TableDirectory, 16);
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typedef struct OffsetTable
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{
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friend struct OpenTypeFontFile;
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friend struct TTCHeader;
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STATIC_DEFINE_GET_FOR_DATA (OffsetTable);
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inline unsigned int get_table_count (void) const
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{ return numTables; }
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inline const Tag& get_table_tag (unsigned int i) const
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{
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if (HB_UNLIKELY (i >= numTables)) return Null(Tag);
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return tableDir[i].tag;
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}
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inline const TableDirectory& get_table (unsigned int i) const
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{
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if (HB_UNLIKELY (i >= numTables)) return Null(TableDirectory);
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return tableDir[i];
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}
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inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
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{
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const Tag t = tag;
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// TODO bsearch
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unsigned int count = numTables;
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for (unsigned int i = 0; i < count; i++)
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{
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if (t == tableDir[i].tag)
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{
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if (table_index) *table_index = i;
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return true;
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}
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}
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if (table_index) *table_index = NO_INDEX;
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return false;
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}
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inline const TableDirectory& get_table_by_tag (hb_tag_t tag) const
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{
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unsigned int table_index;
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find_table_index (tag, &table_index);
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return get_table (table_index);
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}
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inline unsigned int get_face_count (void) const { return 1; }
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public:
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inline bool sanitize (SANITIZE_ARG_DEF, const void *base) {
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TRACE_SANITIZE ();
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if (!(SANITIZE_SELF () && SANITIZE_MEM (tableDir, sizeof (tableDir[0]) * numTables))) return false;
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unsigned int count = numTables;
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for (unsigned int i = 0; i < count; i++)
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if (!SANITIZE_BASE (tableDir[i], base))
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return false;
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return true;
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}
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private:
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Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
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USHORT numTables; /* Number of tables. */
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USHORT searchRange; /* (Maximum power of 2 <= numTables) x 16 */
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USHORT entrySelector; /* Log2(maximum power of 2 <= numTables). */
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USHORT rangeShift; /* NumTables x 16-searchRange. */
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TableDirectory tableDir[VAR]; /* TableDirectory entries. numTables items */
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} OpenTypeFontFace;
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ASSERT_SIZE_VAR (OffsetTable, 12, TableDirectory);
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/*
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* TrueType Collections
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*/
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struct TTCHeader
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{
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friend struct OpenTypeFontFile;
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STATIC_DEFINE_GET_FOR_DATA_CHECK_MAJOR_VERSION (TTCHeader, 1, 2);
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inline unsigned int get_face_count (void) const { return table.len; }
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inline const OpenTypeFontFace& get_face (unsigned int i) const
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{
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return this+table[i];
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}
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inline bool sanitize (SANITIZE_ARG_DEF) {
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TRACE_SANITIZE ();
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if (!SANITIZE (version)) return false;
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if (version.major < 1 || version.major > 2) return true;
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/* TODO Maybe we shouldn't NEUTER these offsets, they may cause a full copy
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* of the whole font right now. */
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return table.sanitize (SANITIZE_ARG, CONST_CHARP(this), CONST_CHARP(this));
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}
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private:
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Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
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FixedVersion version; /* Version of the TTC Header (1.0 or 2.0),
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* 0x00010000 or 0x00020000 */
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LongOffsetLongArrayOf<OffsetTable>
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table; /* Array of offsets to the OffsetTable for each font
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* from the beginning of the file */
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};
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ASSERT_SIZE (TTCHeader, 12);
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/*
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* OpenType Font File
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*/
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struct OpenTypeFontFile
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{
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static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 );
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static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O');
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static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f');
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STATIC_DEFINE_GET_FOR_DATA (OpenTypeFontFile);
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inline unsigned int get_face_count (void) const
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{
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switch (tag) {
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default: return 0;
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case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CONST_CHARP(this)).get_face_count ();
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case TTCTag: return TTCHeader::get_for_data (CONST_CHARP(this)).get_face_count ();
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}
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}
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inline const OpenTypeFontFace& get_face (unsigned int i) const
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{
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switch (tag) {
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default: return Null(OpenTypeFontFace);
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/* Note: for non-collection SFNT data we ignore index. This is because
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* Apple dfont container is a container of SFNT's. So each SFNT is a
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* non-TTC, but the index is more than zero. */
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case TrueTypeTag: case CFFTag: return OffsetTable::get_for_data (CONST_CHARP(this));
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case TTCTag: return TTCHeader::get_for_data (CONST_CHARP(this)).get_face (i);
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}
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}
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/* This is how you get a table */
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inline const char* get_table_data (const OpenTypeTable& table) const
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{
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if (HB_UNLIKELY (table.offset == 0)) return NULL;
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return ((const char*) this) + table.offset;
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}
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inline bool sanitize (SANITIZE_ARG_DEF) {
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TRACE_SANITIZE ();
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if (!SANITIZE_SELF ()) return false;
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switch (tag) {
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default: return true;
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case TrueTypeTag: case CFFTag: return SANITIZE_THIS (CAST (OffsetTable, *this, 0));
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case TTCTag: return SANITIZE (CAST (TTCHeader, *this, 0));
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}
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}
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Tag tag; /* 4-byte identifier. */
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};
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ASSERT_SIZE (OpenTypeFontFile, 4);
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#endif /* HB_OPEN_FILE_PRIVATE_HH */
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