The Tor Browser: gfx/harfbuzz/src/hb-open-file-private.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-open-file-private.hh@925c144e1f1f (annotated)

gfx/harfbuzz/src/hb-open-file-private.hh

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /*
  * 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) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (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) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (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	searchRange;	/* (Maximum power of 2 <= numTables) x 16 */
   USHORT	entrySelector;	/* Log2(maximum power of 2 <= numTables). */
   USHORT	rangeShift;	/* 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) {
     TRACE_SANITIZE (this);
     return TRACE_RETURN (table.sanitize (c, this));
   }
   protected:
   Tag		ttcTag;		/* TrueType Collection ID string: 'ttcf' */
   FixedVersion	version;	/* Version of the TTC Header (1.0),
 				 * 0x00010000 */
   LongOffsetLongArrayOf<OffsetTable>
 		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) {
     TRACE_SANITIZE (this);
     if (unlikely (!u.header.version.sanitize (c))) return TRACE_RETURN (false);
     switch (u.header.version.major) {
     case 2: /* version 2 is compatible with version 1 */
     case 1: return TRACE_RETURN (u.version1.sanitize (c));
     default:return TRACE_RETURN (true);
     }
   }
   protected:
   union {
   struct {
   Tag		ttcTag;		/* TrueType Collection ID string: 'ttcf' */
   FixedVersion	version;	/* Version of the TTC Header (1.0 or 2.0),
 				 * 0x00010000 or 0x00020000 */
   }			header;
   TTCHeaderVersion1	version1;
   } u;
 };
 /*
  * OpenType Font File
  */
 struct OpenTypeFontFile
 {
   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) {
     TRACE_SANITIZE (this);
     if (unlikely (!u.tag.sanitize (c))) return TRACE_RETURN (false);
     switch (u.tag) {
     case CFFTag:	/* All the non-collection tags */
     case TrueTag:
     case Typ1Tag:
     case TrueTypeTag:	return TRACE_RETURN (u.fontFace.sanitize (c));
     case TTCTag:	return TRACE_RETURN (u.ttcHeader.sanitize (c));
     default:		return TRACE_RETURN (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 */

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gfx/harfbuzz/src/hb-open-file-private.hh