C++ FT_FRAME_USHORT函数代码示例

  static FT_Error
  tt_face_load_generic_header( TT_Face    face,
                               FT_Stream  stream,
                               FT_ULong   tag )
  {
    FT_Error    error;
    TT_Header*  header;

    static const FT_Frame_Field  header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_Header

      FT_FRAME_START( 54 ),
        FT_FRAME_ULONG ( Table_Version ),
        FT_FRAME_ULONG ( Font_Revision ),
        FT_FRAME_LONG  ( CheckSum_Adjust ),
        FT_FRAME_LONG  ( Magic_Number ),
        FT_FRAME_USHORT( Flags ),
        FT_FRAME_USHORT( Units_Per_EM ),
        FT_FRAME_LONG  ( Created[0] ),
        FT_FRAME_LONG  ( Created[1] ),
        FT_FRAME_LONG  ( Modified[0] ),
        FT_FRAME_LONG  ( Modified[1] ),
        FT_FRAME_SHORT ( xMin ),
        FT_FRAME_SHORT ( yMin ),
        FT_FRAME_SHORT ( xMax ),
        FT_FRAME_SHORT ( yMax ),
        FT_FRAME_USHORT( Mac_Style ),
        FT_FRAME_USHORT( Lowest_Rec_PPEM ),
        FT_FRAME_SHORT ( Font_Direction ),
        FT_FRAME_SHORT ( Index_To_Loc_Format ),
        FT_FRAME_SHORT ( Glyph_Data_Format ),
      FT_FRAME_END
    };


    error = face->goto_table( face, tag, stream, 0 );
    if ( error )
      goto Exit;

    header = &face->header;

    if ( FT_STREAM_READ_FIELDS( header_fields, header ) )
      goto Exit;

    FT_TRACE3(( "Units per EM: %4u\n", header->Units_Per_EM ));
    FT_TRACE3(( "IndexToLoc:   %4d\n", header->Index_To_Loc_Format ));

  Exit:
    return error;
  }

  tt_face_load_pclt( TT_Face    face,
                     FT_Stream  stream )
  {
    static const FT_Frame_Field  pclt_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_PCLT

      FT_FRAME_START( 54 ),
        FT_FRAME_ULONG ( Version ),
        FT_FRAME_ULONG ( FontNumber ),
        FT_FRAME_USHORT( Pitch ),
        FT_FRAME_USHORT( xHeight ),
        FT_FRAME_USHORT( Style ),
        FT_FRAME_USHORT( TypeFamily ),
        FT_FRAME_USHORT( CapHeight ),
        FT_FRAME_BYTES ( TypeFace, 16 ),
        FT_FRAME_BYTES ( CharacterComplement, 8 ),
        FT_FRAME_BYTES ( FileName, 6 ),
        FT_FRAME_CHAR  ( StrokeWeight ),
        FT_FRAME_CHAR  ( WidthType ),
        FT_FRAME_BYTE  ( SerifStyle ),
        FT_FRAME_BYTE  ( Reserved ),
      FT_FRAME_END
    };

    FT_Error  error;
    TT_PCLT*  pclt = &face->pclt;


    /* optional table */
    error = face->goto_table( face, TTAG_PCLT, stream, 0 );
    if ( error )
      goto Exit;

    if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) )
      goto Exit;

  Exit:
    return error;
  }

  tt_face_load_hhea( TT_Face    face,
                     FT_Stream  stream,
                     FT_Bool    vertical )
  {
    FT_Error        error;
    TT_HoriHeader*  header;

    const FT_Frame_Field  metrics_header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_HoriHeader

      FT_FRAME_START( 36 ),
        FT_FRAME_ULONG ( Version ),
        FT_FRAME_SHORT ( Ascender ),
        FT_FRAME_SHORT ( Descender ),
        FT_FRAME_SHORT ( Line_Gap ),
        FT_FRAME_USHORT( advance_Width_Max ),
        FT_FRAME_SHORT ( min_Left_Side_Bearing ),
        FT_FRAME_SHORT ( min_Right_Side_Bearing ),
        FT_FRAME_SHORT ( xMax_Extent ),
        FT_FRAME_SHORT ( caret_Slope_Rise ),
        FT_FRAME_SHORT ( caret_Slope_Run ),
        FT_FRAME_SHORT ( caret_Offset ),
        FT_FRAME_SHORT ( Reserved[0] ),
        FT_FRAME_SHORT ( Reserved[1] ),
        FT_FRAME_SHORT ( Reserved[2] ),
        FT_FRAME_SHORT ( Reserved[3] ),
        FT_FRAME_SHORT ( metric_Data_Format ),
        FT_FRAME_USHORT( number_Of_HMetrics ),
      FT_FRAME_END
    };


    if ( vertical )
    {
      void  *v = &face->vertical;


      error = face->goto_table( face, TTAG_vhea, stream, 0 );
      if ( error )
        goto Fail;

      header = (TT_HoriHeader*)v;
    }
    else
    {
      error = face->goto_table( face, TTAG_hhea, stream, 0 );
      if ( error )
        goto Fail;

      header = &face->horizontal;
    }

    if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
      goto Fail;

    FT_TRACE3(( "Ascender:          %5d\n", header->Ascender ));
    FT_TRACE3(( "Descender:         %5d\n", header->Descender ));
    FT_TRACE3(( "number_Of_Metrics: %5u\n", header->number_Of_HMetrics ));

    header->long_metrics  = NULL;
    header->short_metrics = NULL;

  Fail:
    return error;
  }

  /*************************************************************************/
  /*************************************************************************/
  /*****                                                               *****/
  /*****                          PFR HEADER                           *****/
  /*****                                                               *****/
  /*************************************************************************/
  /*************************************************************************/

   static const FT_Frame_Field  pfr_header_fields[] =
   {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  PFR_HeaderRec

     FT_FRAME_START( 58 ),
       FT_FRAME_ULONG ( signature ),
       FT_FRAME_USHORT( version ),
       FT_FRAME_USHORT( signature2 ),
       FT_FRAME_USHORT( header_size ),

       FT_FRAME_USHORT( log_dir_size ),
       FT_FRAME_USHORT( log_dir_offset ),

       FT_FRAME_USHORT( log_font_max_size ),
       FT_FRAME_UOFF3 ( log_font_section_size ),
       FT_FRAME_UOFF3 ( log_font_section_offset ),

       FT_FRAME_USHORT( phy_font_max_size ),
       FT_FRAME_UOFF3 ( phy_font_section_size ),
       FT_FRAME_UOFF3 ( phy_font_section_offset ),

       FT_FRAME_USHORT( gps_max_size ),

  tt_face_load_os2( TT_Face    face,
                    FT_Stream  stream )
  {
    FT_Error  error;
    TT_OS2*   os2;

    const FT_Frame_Field  os2_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_OS2

      FT_FRAME_START( 78 ),
        FT_FRAME_USHORT( version ),
        FT_FRAME_SHORT ( xAvgCharWidth ),
        FT_FRAME_USHORT( usWeightClass ),
        FT_FRAME_USHORT( usWidthClass ),
        FT_FRAME_SHORT ( fsType ),
        FT_FRAME_SHORT ( ySubscriptXSize ),
        FT_FRAME_SHORT ( ySubscriptYSize ),
        FT_FRAME_SHORT ( ySubscriptXOffset ),
        FT_FRAME_SHORT ( ySubscriptYOffset ),
        FT_FRAME_SHORT ( ySuperscriptXSize ),
        FT_FRAME_SHORT ( ySuperscriptYSize ),
        FT_FRAME_SHORT ( ySuperscriptXOffset ),
        FT_FRAME_SHORT ( ySuperscriptYOffset ),
        FT_FRAME_SHORT ( yStrikeoutSize ),
        FT_FRAME_SHORT ( yStrikeoutPosition ),
        FT_FRAME_SHORT ( sFamilyClass ),
        FT_FRAME_BYTE  ( panose[0] ),
        FT_FRAME_BYTE  ( panose[1] ),
        FT_FRAME_BYTE  ( panose[2] ),
        FT_FRAME_BYTE  ( panose[3] ),
        FT_FRAME_BYTE  ( panose[4] ),
        FT_FRAME_BYTE  ( panose[5] ),
        FT_FRAME_BYTE  ( panose[6] ),
        FT_FRAME_BYTE  ( panose[7] ),
        FT_FRAME_BYTE  ( panose[8] ),
        FT_FRAME_BYTE  ( panose[9] ),
        FT_FRAME_ULONG ( ulUnicodeRange1 ),
        FT_FRAME_ULONG ( ulUnicodeRange2 ),
        FT_FRAME_ULONG ( ulUnicodeRange3 ),
        FT_FRAME_ULONG ( ulUnicodeRange4 ),
        FT_FRAME_BYTE  ( achVendID[0] ),
        FT_FRAME_BYTE  ( achVendID[1] ),
        FT_FRAME_BYTE  ( achVendID[2] ),
        FT_FRAME_BYTE  ( achVendID[3] ),

        FT_FRAME_USHORT( fsSelection ),
        FT_FRAME_USHORT( usFirstCharIndex ),
        FT_FRAME_USHORT( usLastCharIndex ),
        FT_FRAME_SHORT ( sTypoAscender ),
        FT_FRAME_SHORT ( sTypoDescender ),
        FT_FRAME_SHORT ( sTypoLineGap ),
        FT_FRAME_USHORT( usWinAscent ),
        FT_FRAME_USHORT( usWinDescent ),
      FT_FRAME_END
    };

    const FT_Frame_Field  os2_fields_extra[] =
    {
      FT_FRAME_START( 8 ),
        FT_FRAME_ULONG( ulCodePageRange1 ),
        FT_FRAME_ULONG( ulCodePageRange2 ),
      FT_FRAME_END
    };

    const FT_Frame_Field  os2_fields_extra2[] =
    {
      FT_FRAME_START( 10 ),
        FT_FRAME_SHORT ( sxHeight ),
        FT_FRAME_SHORT ( sCapHeight ),
        FT_FRAME_USHORT( usDefaultChar ),
        FT_FRAME_USHORT( usBreakChar ),
        FT_FRAME_USHORT( usMaxContext ),
      FT_FRAME_END
    };


    /* We now support old Mac fonts where the OS/2 table doesn't  */
    /* exist.  Simply put, we set the `version' field to 0xFFFF   */
    /* and test this value each time we need to access the table. */
    error = face->goto_table( face, TTAG_OS2, stream, 0 );
    if ( error )
      goto Exit;

    os2 = &face->os2;

    if ( FT_STREAM_READ_FIELDS( os2_fields, os2 ) )
      goto Exit;

    os2->ulCodePageRange1 = 0;
    os2->ulCodePageRange2 = 0;
    os2->sxHeight         = 0;
    os2->sCapHeight       = 0;
    os2->usDefaultChar    = 0;
    os2->usBreakChar      = 0;
    os2->usMaxContext     = 0;

    if ( os2->version >= 0x0001 )
    {
//.........这里部分代码省略.........

  tt_face_load_name( TT_Face    face,
                     FT_Stream  stream )
  {
    FT_Error      error;
    FT_Memory     memory = stream->memory;
    FT_ULong      table_pos, table_len;
    FT_ULong      storage_start, storage_limit;
    FT_UInt       count;
    TT_NameTable  table;

    static const FT_Frame_Field  name_table_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_NameTableRec

      FT_FRAME_START( 6 ),
        FT_FRAME_USHORT( format ),
        FT_FRAME_USHORT( numNameRecords ),
        FT_FRAME_USHORT( storageOffset ),
      FT_FRAME_END
    };

    static const FT_Frame_Field  name_record_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_NameEntryRec

      /* no FT_FRAME_START */
        FT_FRAME_USHORT( platformID ),
        FT_FRAME_USHORT( encodingID ),
        FT_FRAME_USHORT( languageID ),
        FT_FRAME_USHORT( nameID ),
        FT_FRAME_USHORT( stringLength ),
        FT_FRAME_USHORT( stringOffset ),
      FT_FRAME_END
    };


    table         = &face->name_table;
    table->stream = stream;

    error = face->goto_table( face, TTAG_name, stream, &table_len );
    if ( error )
      goto Exit;

    table_pos = FT_STREAM_POS();


    if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) )
      goto Exit;

    /* Some popular Asian fonts have an invalid `storageOffset' value   */
    /* (it should be at least "6 + 12*num_names").  However, the string */
    /* offsets, computed as "storageOffset + entry->stringOffset", are  */
    /* valid pointers within the name table...                          */
    /*                                                                  */
    /* We thus can't check `storageOffset' right now.                   */
    /*                                                                  */
    storage_start = table_pos + 6 + 12*table->numNameRecords;
    storage_limit = table_pos + table_len;

    if ( storage_start > storage_limit )
    {
      FT_ERROR(( "tt_face_load_name: invalid `name' table\n" ));
      error = SFNT_Err_Name_Table_Missing;
      goto Exit;
    }

    /* Allocate the array of name records. */
    count                 = table->numNameRecords;
    table->numNameRecords = 0;

    if ( FT_NEW_ARRAY( table->names, count ) ||
         FT_FRAME_ENTER( count * 12 )        )
      goto Exit;

    /* Load the name records and determine how much storage is needed */
    /* to hold the strings themselves.                                */
    {
      TT_NameEntryRec*  entry = table->names;


      for ( ; count > 0; count-- )
      {
        if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) )
          continue;

        /* check that the name is not empty */
        if ( entry->stringLength == 0 )
          continue;

        /* check that the name string is within the table */
        entry->stringOffset += table_pos + table->storageOffset;
        if ( entry->stringOffset                       < storage_start ||
             entry->stringOffset + entry->stringLength > storage_limit )
        {
          /* invalid entry - ignore it */
          entry->stringOffset = 0;
          entry->stringLength = 0;
          continue;
//.........这里部分代码省略.........

  tt_face_load_maxp( TT_Face    face,
                     FT_Stream  stream )
  {
    FT_Error        error;
    TT_MaxProfile*  maxProfile = &face->max_profile;

    const FT_Frame_Field  maxp_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_MaxProfile

      FT_FRAME_START( 6 ),
        FT_FRAME_LONG  ( version ),
        FT_FRAME_USHORT( numGlyphs ),
      FT_FRAME_END
    };

    const FT_Frame_Field  maxp_fields_extra[] =
    {
      FT_FRAME_START( 26 ),
        FT_FRAME_USHORT( maxPoints ),
        FT_FRAME_USHORT( maxContours ),
        FT_FRAME_USHORT( maxCompositePoints ),
        FT_FRAME_USHORT( maxCompositeContours ),
        FT_FRAME_USHORT( maxZones ),
        FT_FRAME_USHORT( maxTwilightPoints ),
        FT_FRAME_USHORT( maxStorage ),
        FT_FRAME_USHORT( maxFunctionDefs ),
        FT_FRAME_USHORT( maxInstructionDefs ),
        FT_FRAME_USHORT( maxStackElements ),
        FT_FRAME_USHORT( maxSizeOfInstructions ),
        FT_FRAME_USHORT( maxComponentElements ),
        FT_FRAME_USHORT( maxComponentDepth ),
      FT_FRAME_END
    };


    error = face->goto_table( face, TTAG_maxp, stream, 0 );
    if ( error )
      goto Exit;

    if ( FT_STREAM_READ_FIELDS( maxp_fields, maxProfile ) )
      goto Exit;

    maxProfile->maxPoints             = 0;
    maxProfile->maxContours           = 0;
    maxProfile->maxCompositePoints    = 0;
    maxProfile->maxCompositeContours  = 0;
    maxProfile->maxZones              = 0;
    maxProfile->maxTwilightPoints     = 0;
    maxProfile->maxStorage            = 0;
    maxProfile->maxFunctionDefs       = 0;
    maxProfile->maxInstructionDefs    = 0;
    maxProfile->maxStackElements      = 0;
    maxProfile->maxSizeOfInstructions = 0;
    maxProfile->maxComponentElements  = 0;
    maxProfile->maxComponentDepth     = 0;

    if ( maxProfile->version >= 0x10000L )
    {
      if ( FT_STREAM_READ_FIELDS( maxp_fields_extra, maxProfile ) )
        goto Exit;

      /* XXX: an adjustment that is necessary to load certain */
      /*      broken fonts like `Keystrokes MT' :-(           */
      /*                                                      */
      /*   We allocate 64 function entries by default when    */
      /*   the maxFunctionDefs field is null.                 */

      if ( maxProfile->maxFunctionDefs == 0 )
        maxProfile->maxFunctionDefs = 64;

      /* we add 4 phantom points later */
      if ( maxProfile->maxTwilightPoints > ( 0xFFFFU - 4 ) )
      {
        FT_TRACE0(( "tt_face_load_maxp:"
                    " too much twilight points in `maxp' table;\n"
                    "                  "
                    " some glyphs might be rendered incorrectly\n" ));

        maxProfile->maxTwilightPoints = 0xFFFFU - 4;
      }
    }

    FT_TRACE3(( "numGlyphs: %u\n", maxProfile->numGlyphs ));

  Exit:
    return error;
  }

  tt_face_load_font_dir( TT_Face    face,
                         FT_Stream  stream )
  {
    SFNT_HeaderRec  sfnt;
    FT_Error        error;
    FT_Memory       memory = stream->memory;
    TT_TableRec*    entry;
    FT_Int          nn;

    static const FT_Frame_Field  offset_table_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  SFNT_HeaderRec

      FT_FRAME_START( 8 ),
        FT_FRAME_USHORT( num_tables ),
        FT_FRAME_USHORT( search_range ),
        FT_FRAME_USHORT( entry_selector ),
        FT_FRAME_USHORT( range_shift ),
      FT_FRAME_END
    };


    FT_TRACE2(( "tt_face_load_font_dir: %08p\n", face ));

    /* read the offset table */

    sfnt.offset = FT_STREAM_POS();

    if ( FT_READ_ULONG( sfnt.format_tag )                    ||
         FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) )
      goto Exit;

    /* many fonts don't have these fields set correctly */
#if 0
    if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 )        ||
         sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 )
      return SFNT_Err_Unknown_File_Format;
#endif

    /* load the table directory */

    FT_TRACE2(( "-- Number of tables: %10u\n",    sfnt.num_tables ));
    FT_TRACE2(( "-- Format version:   0x%08lx\n", sfnt.format_tag ));

    /* check first */
    error = check_table_dir( &sfnt, stream );
    if ( error )
    {
      FT_TRACE2(( "tt_face_load_font_dir:"
                  " invalid table directory for TrueType\n" ));

      goto Exit;
    }

    face->num_tables = sfnt.num_tables;
    face->format_tag = sfnt.format_tag;

    if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )
      goto Exit;

    if ( FT_STREAM_SEEK( sfnt.offset + 12 )       ||
         FT_FRAME_ENTER( face->num_tables * 16L ) )
      goto Exit;

    entry = face->dir_tables;

    for ( nn = 0; nn < sfnt.num_tables; nn++ )
    {
      entry->Tag      = FT_GET_TAG4();
      entry->CheckSum = FT_GET_ULONG();
      entry->Offset   = FT_GET_LONG();
      entry->Length   = FT_GET_LONG();

      /* ignore invalid tables */
      if ( entry->Offset + entry->Length > stream->size )
        continue;
      else
      {
        FT_TRACE2(( "  %c%c%c%c  -  %08lx  -  %08lx\n",
                    (FT_Char)( entry->Tag >> 24 ),
                    (FT_Char)( entry->Tag >> 16 ),
                    (FT_Char)( entry->Tag >> 8  ),
                    (FT_Char)( entry->Tag       ),
                    entry->Offset,
                    entry->Length ));
        entry++;
      }
    }

    FT_FRAME_EXIT();

    FT_TRACE2(( "table directory loaded\n\n" ));

  Exit:
    return error;
  }

  tt_face_load_font_dir( TT_Face    face,
                         FT_Stream  stream )
  {
    SFNT_HeaderRec  sfnt;
    FT_Error        error;
    FT_Memory       memory = stream->memory;
    TT_TableRec*    entry;
    FT_Int          nn;

    static const FT_Frame_Field  offset_table_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  SFNT_HeaderRec

      FT_FRAME_START( 8 ),
        FT_FRAME_USHORT( num_tables ),
        FT_FRAME_USHORT( search_range ),
        FT_FRAME_USHORT( entry_selector ),
        FT_FRAME_USHORT( range_shift ),
      FT_FRAME_END
    };


    FT_TRACE2(( "tt_face_load_font_dir: %08p\n", face ));

    /* read the offset table */

    sfnt.offset = FT_STREAM_POS();

    if ( FT_READ_ULONG( sfnt.format_tag )                    ||
         FT_STREAM_READ_FIELDS( offset_table_fields, &sfnt ) )
      goto Exit;

    /* many fonts don't have these fields set correctly */
#if 0
    if ( sfnt.search_range != 1 << ( sfnt.entry_selector + 4 )        ||
         sfnt.search_range + sfnt.range_shift != sfnt.num_tables << 4 )
      return FT_THROW( Unknown_File_Format );
#endif

    /* load the table directory */

    FT_TRACE2(( "-- Number of tables: %10u\n",    sfnt.num_tables ));
    FT_TRACE2(( "-- Format version:   0x%08lx\n", sfnt.format_tag ));

    if ( sfnt.format_tag != TTAG_OTTO )
    {
      /* check first */
      error = check_table_dir( &sfnt, stream );
      if ( error )
      {
        FT_TRACE2(( "tt_face_load_font_dir:"
                    " invalid table directory for TrueType\n" ));

        goto Exit;
      }
    }

    face->num_tables = sfnt.num_tables;
    face->format_tag = sfnt.format_tag;

    if ( FT_QNEW_ARRAY( face->dir_tables, face->num_tables ) )
      goto Exit;

    if ( FT_STREAM_SEEK( sfnt.offset + 12 )       ||
         FT_FRAME_ENTER( face->num_tables * 16L ) )
      goto Exit;

    entry = face->dir_tables;

    FT_TRACE2(( "\n"
                "  tag    offset    length   checksum\n"
                "  ----------------------------------\n" ));

    for ( nn = 0; nn < sfnt.num_tables; nn++ )
    {
      entry->Tag      = FT_GET_TAG4();
      entry->CheckSum = FT_GET_ULONG();
      entry->Offset   = FT_GET_ULONG();
      entry->Length   = FT_GET_ULONG();

      /* ignore invalid tables that can't be sanitized */

      if ( entry->Offset > stream->size )
        continue;
      else if ( entry->Length > stream->size - entry->Offset )
      {
        if ( entry->Tag == TTAG_hmtx ||
             entry->Tag == TTAG_vmtx )
        {
#ifdef FT_DEBUG_LEVEL_TRACE
          FT_ULong  old_length = entry->Length;
#endif


          /* make metrics table length a multiple of 4 */
          entry->Length = ( stream->size - entry->Offset ) & ~3U;

          FT_TRACE2(( "  %c%c%c%c  %08lx  %08lx  %08lx"
                      " (sanitized; original length %08lx)\n",
//.........这里部分代码省略.........

  static FT_Error
  woff_open_font( FT_Stream  stream,
                  TT_Face    face )
  {
    FT_Memory       memory = stream->memory;
    FT_Error        error  = FT_Err_Ok;

    WOFF_HeaderRec  woff;
    WOFF_Table      tables  = NULL;
    WOFF_Table*     indices = NULL;

    FT_ULong        woff_offset;

    FT_Byte*        sfnt        = NULL;
    FT_Stream       sfnt_stream = NULL;

    FT_Byte*        sfnt_header;
    FT_ULong        sfnt_offset;

    FT_Int          nn;
    FT_ULong        old_tag = 0;

    static const FT_Frame_Field  woff_header_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  WOFF_HeaderRec

      FT_FRAME_START( 44 ),
        FT_FRAME_ULONG ( signature ),
        FT_FRAME_ULONG ( flavor ),
        FT_FRAME_ULONG ( length ),
        FT_FRAME_USHORT( num_tables ),
        FT_FRAME_USHORT( reserved ),
        FT_FRAME_ULONG ( totalSfntSize ),
        FT_FRAME_USHORT( majorVersion ),
        FT_FRAME_USHORT( minorVersion ),
        FT_FRAME_ULONG ( metaOffset ),
        FT_FRAME_ULONG ( metaLength ),
        FT_FRAME_ULONG ( metaOrigLength ),
        FT_FRAME_ULONG ( privOffset ),
        FT_FRAME_ULONG ( privLength ),
      FT_FRAME_END
    };


    FT_ASSERT( stream == face->root.stream );
    FT_ASSERT( FT_STREAM_POS() == 0 );

    if ( FT_STREAM_READ_FIELDS( woff_header_fields, &woff ) )
      return error;

    /* Make sure we don't recurse back here or hit TTC code. */
    if ( woff.flavor == TTAG_wOFF || woff.flavor == TTAG_ttcf )
      return FT_THROW( Invalid_Table );

    /* Miscellaneous checks. */
    if ( woff.length != stream->size                              ||
         woff.num_tables == 0                                     ||
         44 + woff.num_tables * 20UL >= woff.length               ||
         12 + woff.num_tables * 16UL >= woff.totalSfntSize        ||
         ( woff.totalSfntSize & 3 ) != 0                          ||
         ( woff.metaOffset == 0 && ( woff.metaLength != 0     ||
                                     woff.metaOrigLength != 0 ) ) ||
         ( woff.metaLength != 0 && woff.metaOrigLength == 0 )     ||
         ( woff.privOffset == 0 && woff.privLength != 0 )         )
      return FT_THROW( Invalid_Table );

    if ( FT_ALLOC( sfnt, woff.totalSfntSize ) ||
         FT_NEW( sfnt_stream )                )
      goto Exit;

    sfnt_header = sfnt;

    /* Write sfnt header. */
    {
      FT_UInt  searchRange, entrySelector, rangeShift, x;


      x             = woff.num_tables;
      entrySelector = 0;
      while ( x )
      {
        x            >>= 1;
        entrySelector += 1;
      }
      entrySelector--;

      searchRange = ( 1 << entrySelector ) * 16;
      rangeShift  = woff.num_tables * 16 - searchRange;

      WRITE_ULONG ( sfnt_header, woff.flavor );
      WRITE_USHORT( sfnt_header, woff.num_tables );
      WRITE_USHORT( sfnt_header, searchRange );
      WRITE_USHORT( sfnt_header, entrySelector );
      WRITE_USHORT( sfnt_header, rangeShift );
    }

    /* While the entries in the sfnt header must be sorted by the */
    /* tag value, the tables themselves are not.  We thus have to */
    /* sort them by offset and check that they don't overlap.     */
//.........这里部分代码省略.........

  {
    FT_UShort  tag;
    FT_Long    size;

  } PFB_Tag;


#undef  FT_STRUCTURE
#define FT_STRUCTURE  PFB_Tag


  static
  const FT_Frame_Field  pfb_tag_fields[] =
  {
    FT_FRAME_START( 6 ),
      FT_FRAME_USHORT ( tag ),
      FT_FRAME_LONG_LE( size ),
    FT_FRAME_END
  };


  static FT_Error
  read_pfb_tag( FT_Stream   stream,
                FT_UShort*  tag,
                FT_Long*    size )
  {
    FT_Error  error;
    PFB_Tag   head;


    *tag  = 0;