257 lines
7.0 KiB
C++
257 lines
7.0 KiB
C++
/*
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* Copyright © 2007,2008,2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping 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 TableRecord
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{
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return c->check_struct (this);
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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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public:
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DEFINE_SIZE_STATIC (16);
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} OpenTypeTable;
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typedef struct OffsetTable
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{
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friend struct OpenTypeFontFile;
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inline unsigned int get_table_count (void) const
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{ return numTables; }
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inline const TableRecord& get_table (unsigned int i) const
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{
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if (unlikely (i >= numTables)) return Null(TableRecord);
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return tables[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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Tag t;
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t.set (tag);
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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 == tables[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 = Index::NOT_FOUND_INDEX;
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return false;
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}
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inline const TableRecord& 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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public:
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return c->check_struct (this)
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&& c->check_array (tables, TableRecord::static_size, numTables);
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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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TableRecord tables[VAR]; /* TableRecord entries. numTables items */
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public:
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DEFINE_SIZE_ARRAY (12, tables);
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} OpenTypeFontFace;
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/*
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* TrueType Collections
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*/
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struct TTCHeaderVersion1
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{
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friend struct TTCHeader;
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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 { return this+table[i]; }
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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return table.sanitize (c, 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),
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* 0x00010000 */
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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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public:
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DEFINE_SIZE_ARRAY (12, table);
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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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private:
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inline unsigned int get_face_count (void) const
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{
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switch (u.header.version.major) {
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case 2: /* version 2 is compatible with version 1 */
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case 1: return u.version1.get_face_count ();
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default:return 0;
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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 (u.header.version.major) {
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case 2: /* version 2 is compatible with version 1 */
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case 1: return u.version1.get_face (i);
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default:return Null(OpenTypeFontFace);
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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if (unlikely (!u.header.version.sanitize (c))) return false;
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switch (u.header.version.major) {
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case 2: /* version 2 is compatible with version 1 */
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case 1: return u.version1.sanitize (c);
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default:return true;
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}
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}
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private:
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union {
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struct {
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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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} header;
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TTCHeaderVersion1 version1;
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} u;
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};
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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 CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */
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static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */
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static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */
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static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */
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static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */
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inline hb_tag_t get_tag (void) const { return u.tag; }
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inline unsigned int get_face_count (void) const
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{
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switch (u.tag) {
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case CFFTag: /* All the non-collection tags */
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case TrueTag:
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case Typ1Tag:
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case TrueTypeTag: return 1;
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case TTCTag: return u.ttcHeader.get_face_count ();
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default: return 0;
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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 (u.tag) {
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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 CFFTag: /* All the non-collection tags */
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case TrueTag:
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case Typ1Tag:
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case TrueTypeTag: return u.fontFace;
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case TTCTag: return u.ttcHeader.get_face (i);
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default: return Null(OpenTypeFontFace);
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}
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}
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inline bool sanitize (hb_sanitize_context_t *c) {
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TRACE_SANITIZE ();
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if (unlikely (!u.tag.sanitize (c))) return false;
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switch (u.tag) {
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case CFFTag: /* All the non-collection tags */
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case TrueTag:
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case Typ1Tag:
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case TrueTypeTag: return u.fontFace.sanitize (c);
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case TTCTag: return u.ttcHeader.sanitize (c);
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default: return true;
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}
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}
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private:
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union {
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Tag tag; /* 4-byte identifier. */
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OpenTypeFontFace fontFace;
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TTCHeader ttcHeader;
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} u;
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public:
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DEFINE_SIZE_UNION (4, tag);
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};
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#endif /* HB_OPEN_FILE_PRIVATE_HH */
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