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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/*
+ * Copyright © 2007,2008,2009 Red Hat, Inc.
+ * Copyright © 2012 Google, Inc.
+ *
+ * This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_OPEN_FILE_PRIVATE_HH
+#define HB_OPEN_FILE_PRIVATE_HH
+
+#include "hb-open-type-private.hh"
+
+
+namespace OT {
+
+
+/*
+ *
+ * The OpenType Font File
+ *
+ */
+
+
+/*
+ * Organization of an OpenType Font
+ */
+
+struct OpenTypeFontFile;
+struct OffsetTable;
+struct TTCHeader;
+
+
+typedef struct TableRecord
+{
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this));
+ }
+
+ Tag tag; /* 4-byte identifier. */
+ CheckSum checkSum; /* CheckSum for this table. */
+ ULONG offset; /* Offset from beginning of TrueType font
+ * file. */
+ ULONG length; /* Length of this table. */
+ public:
+ DEFINE_SIZE_STATIC (16);
+} OpenTypeTable;
+
+typedef struct OffsetTable
+{
+ friend struct OpenTypeFontFile;
+
+ inline unsigned int get_table_count (void) const
+ { return numTables; }
+ inline const TableRecord& get_table (unsigned int i) const
+ {
+ if (unlikely (i >= numTables)) return Null(TableRecord);
+ return tables[i];
+ }
+ inline bool find_table_index (hb_tag_t tag, unsigned int *table_index) const
+ {
+ Tag t;
+ t.set (tag);
+ unsigned int count = numTables;
+ for (unsigned int i = 0; i < count; i++)
+ {
+ if (t == tables[i].tag)
+ {
+ if (table_index) *table_index = i;
+ return true;
+ }
+ }
+ if (table_index) *table_index = Index::NOT_FOUND_INDEX;
+ return false;
+ }
+ inline const TableRecord& get_table_by_tag (hb_tag_t tag) const
+ {
+ unsigned int table_index;
+ find_table_index (tag, &table_index);
+ return get_table (table_index);
+ }
+
+ public:
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (c->check_struct (this) && c->check_array (tables, TableRecord::static_size, numTables));
+ }
+
+ protected:
+ Tag sfnt_version; /* '\0\001\0\00' if TrueType / 'OTTO' if CFF */
+ USHORT numTables; /* Number of tables. */
+ USHORT searchRangeZ; /* (Maximum power of 2 <= numTables) x 16 */
+ USHORT entrySelectorZ; /* Log2(maximum power of 2 <= numTables). */
+ USHORT rangeShiftZ; /* NumTables x 16-searchRange. */
+ TableRecord tables[VAR]; /* TableRecord entries. numTables items */
+ public:
+ DEFINE_SIZE_ARRAY (12, tables);
+} OpenTypeFontFace;
+
+
+/*
+ * TrueType Collections
+ */
+
+struct TTCHeaderVersion1
+{
+ friend struct TTCHeader;
+
+ inline unsigned int get_face_count (void) const { return table.len; }
+ inline const OpenTypeFontFace& get_face (unsigned int i) const { return this+table[i]; }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ return_trace (table.sanitize (c, this));
+ }
+
+ protected:
+ Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
+ FixedVersion<>version; /* Version of the TTC Header (1.0),
+ * 0x00010000u */
+ ArrayOf<OffsetTo<OffsetTable, ULONG>, ULONG>
+ table; /* Array of offsets to the OffsetTable for each font
+ * from the beginning of the file */
+ public:
+ DEFINE_SIZE_ARRAY (12, table);
+};
+
+struct TTCHeader
+{
+ friend struct OpenTypeFontFile;
+
+ private:
+
+ inline unsigned int get_face_count (void) const
+ {
+ switch (u.header.version.major) {
+ case 2: /* version 2 is compatible with version 1 */
+ case 1: return u.version1.get_face_count ();
+ default:return 0;
+ }
+ }
+ inline const OpenTypeFontFace& get_face (unsigned int i) const
+ {
+ switch (u.header.version.major) {
+ case 2: /* version 2 is compatible with version 1 */
+ case 1: return u.version1.get_face (i);
+ default:return Null(OpenTypeFontFace);
+ }
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!u.header.version.sanitize (c))) return_trace (false);
+ switch (u.header.version.major) {
+ case 2: /* version 2 is compatible with version 1 */
+ case 1: return_trace (u.version1.sanitize (c));
+ default:return_trace (true);
+ }
+ }
+
+ protected:
+ union {
+ struct {
+ Tag ttcTag; /* TrueType Collection ID string: 'ttcf' */
+ FixedVersion<>version; /* Version of the TTC Header (1.0 or 2.0),
+ * 0x00010000u or 0x00020000u */
+ } header;
+ TTCHeaderVersion1 version1;
+ } u;
+};
+
+
+/*
+ * OpenType Font File
+ */
+
+struct OpenTypeFontFile
+{
+ static const hb_tag_t tableTag = HB_TAG ('_','_','_','_'); /* Sanitizer needs this. */
+
+ static const hb_tag_t CFFTag = HB_TAG ('O','T','T','O'); /* OpenType with Postscript outlines */
+ static const hb_tag_t TrueTypeTag = HB_TAG ( 0 , 1 , 0 , 0 ); /* OpenType with TrueType outlines */
+ static const hb_tag_t TTCTag = HB_TAG ('t','t','c','f'); /* TrueType Collection */
+ static const hb_tag_t TrueTag = HB_TAG ('t','r','u','e'); /* Obsolete Apple TrueType */
+ static const hb_tag_t Typ1Tag = HB_TAG ('t','y','p','1'); /* Obsolete Apple Type1 font in SFNT container */
+
+ inline hb_tag_t get_tag (void) const { return u.tag; }
+
+ inline unsigned int get_face_count (void) const
+ {
+ switch (u.tag) {
+ case CFFTag: /* All the non-collection tags */
+ case TrueTag:
+ case Typ1Tag:
+ case TrueTypeTag: return 1;
+ case TTCTag: return u.ttcHeader.get_face_count ();
+ default: return 0;
+ }
+ }
+ inline const OpenTypeFontFace& get_face (unsigned int i) const
+ {
+ switch (u.tag) {
+ /* Note: for non-collection SFNT data we ignore index. This is because
+ * Apple dfont container is a container of SFNT's. So each SFNT is a
+ * non-TTC, but the index is more than zero. */
+ case CFFTag: /* All the non-collection tags */
+ case TrueTag:
+ case Typ1Tag:
+ case TrueTypeTag: return u.fontFace;
+ case TTCTag: return u.ttcHeader.get_face (i);
+ default: return Null(OpenTypeFontFace);
+ }
+ }
+
+ inline bool sanitize (hb_sanitize_context_t *c) const
+ {
+ TRACE_SANITIZE (this);
+ if (unlikely (!u.tag.sanitize (c))) return_trace (false);
+ switch (u.tag) {
+ case CFFTag: /* All the non-collection tags */
+ case TrueTag:
+ case Typ1Tag:
+ case TrueTypeTag: return_trace (u.fontFace.sanitize (c));
+ case TTCTag: return_trace (u.ttcHeader.sanitize (c));
+ default: return_trace (true);
+ }
+ }
+
+ protected:
+ union {
+ Tag tag; /* 4-byte identifier. */
+ OpenTypeFontFace fontFace;
+ TTCHeader ttcHeader;
+ } u;
+ public:
+ DEFINE_SIZE_UNION (4, tag);
+};
+
+
+} /* namespace OT */
+
+
+#endif /* HB_OPEN_FILE_PRIVATE_HH */