ttload.h File Reference

#include <ft2build.h>

Include dependency graph for ttload.h:

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Go to the source code of this file.

Functions
FT_BEGIN_HEADER	tt_face_lookup_table (TT_Face face, FT_ULong tag)
	tt_face_goto_table (TT_Face face, FT_ULong tag, FT_Stream stream, FT_ULong *length)
	tt_face_load_font_dir (TT_Face face, FT_Stream stream)
	tt_face_load_any (TT_Face face, FT_ULong tag, FT_Long offset, FT_Byte *buffer, FT_ULong *length)
	tt_face_load_head (TT_Face face, FT_Stream stream)
	tt_face_load_cmap (TT_Face face, FT_Stream stream)
	tt_face_load_maxp (TT_Face face, FT_Stream stream)
	tt_face_load_name (TT_Face face, FT_Stream stream)
	tt_face_load_os2 (TT_Face face, FT_Stream stream)
	tt_face_load_post (TT_Face face, FT_Stream stream)
	tt_face_load_pclt (TT_Face face, FT_Stream stream)
	tt_face_free_name (TT_Face face)
	tt_face_load_gasp (TT_Face face, FT_Stream stream)

Function Documentation

tt_face_free_name()

tt_face_free_name

(

TT_Face

face

)

Definition at line 996 of file ttload.c.

  {
    FT_Memory     memory = face->root.driver->root.memory;
    TT_NameTable  table  = &face->name_table;
 
 
    if ( table->names )
    {
      TT_Name  entry = table->names;
      TT_Name  limit = entry + table->numNameRecords;
 
 
      for ( ; entry < limit; entry++ )
        FT_FREE( entry->string );
 
      FT_FREE( table->names );
    }
 
    if ( table->langTags )
    {
      TT_LangTag  entry = table->langTags;
      TT_LangTag  limit = entry + table->numLangTagRecords;
 
 
      for ( ; entry < limit; entry++ )
        FT_FREE( entry->string );
 
      FT_FREE( table->langTags );
    }
 
    table->numNameRecords    = 0;
    table->numLangTagRecords = 0;
    table->format            = 0;
    table->storageOffset     = 0;
  }

tt_face_goto_table()

tt_face_goto_table	(	TT_Face	face,
		FT_ULong	tag,
		FT_Stream	stream,
		FT_ULong *	length
	)

Definition at line 126 of file ttload.c.

  {
    TT_Table  table;
    FT_Error  error;
 
 
    table = tt_face_lookup_table( face, tag );
    if ( table )
    {
      if ( length )
        *length = table->Length;
 
      if ( FT_STREAM_SEEK( table->Offset ) )
        goto Exit;
    }
    else
      error = FT_THROW( Table_Missing );
 
  Exit:
    return error;
  }

tt_face_load_any()

tt_face_load_any	(	TT_Face	face,
		FT_ULong	tag,
		FT_Long	offset,
		FT_Byte *	buffer,
		FT_ULong *	length
	)

Definition at line 540 of file ttload.c.

  {
    FT_Error   error;
    FT_Stream  stream;
    TT_Table   table;
    FT_ULong   size;
 
 
    if ( tag != 0 )
    {
      /* look for tag in font directory */
      table = tt_face_lookup_table( face, tag );
      if ( !table )
      {
        error = FT_THROW( Table_Missing );
        goto Exit;
      }
 
      offset += table->Offset;
      size    = table->Length;
    }
    else
      /* tag == 0 -- the user wants to access the font file directly */
      size = face->root.stream->size;
 
    if ( length && *length == 0 )
    {
      *length = size;
 
      return FT_Err_Ok;
    }
 
    if ( length )
      size = *length;
 
    stream = face->root.stream;
    /* the `if' is syntactic sugar for picky compilers */
    if ( FT_STREAM_READ_AT( offset, buffer, size ) )
      goto Exit;
 
  Exit:
    return error;
  }

tt_face_load_cmap()

tt_face_load_cmap	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 1052 of file ttload.c.

  {
    FT_Error  error;
 
 
    error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size );
    if ( error )
      goto Exit;
 
    if ( FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) )
      face->cmap_size = 0;
 
  Exit:
    return error;
  }

tt_face_load_font_dir()

tt_face_load_font_dir	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 335 of file ttload.c.

  {
    SFNT_HeaderRec  sfnt;
    FT_Error        error;
    FT_Memory       memory = stream->memory;
    FT_UShort       nn, valid_entries = 0;
 
    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, &valid_entries );
      if ( error )
      {
        FT_TRACE2(( "tt_face_load_font_dir:"
                    " invalid table directory for TrueType\n" ));
        goto Exit;
      }
    }
    else
      valid_entries = sfnt.num_tables;
 
    face->num_tables = valid_entries;
    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( sfnt.num_tables * 16L ) )
      goto Exit;
 
    FT_TRACE2(( "\n"
                "  tag    offset    length   checksum\n"
                "  ----------------------------------\n" ));
 
    valid_entries = 0;
    for ( nn = 0; nn < sfnt.num_tables; nn++ )
    {
      TT_TableRec  entry;
      FT_UShort    i;
      FT_Bool      duplicate;
 
 
      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)",
                      (FT_Char)( entry.Tag >> 24 ),
                      (FT_Char)( entry.Tag >> 16 ),
                      (FT_Char)( entry.Tag >> 8  ),
                      (FT_Char)( entry.Tag       ),
                      entry.Offset,
                      entry.Length,
                      entry.CheckSum,
                      old_length ));
        }
        else
          continue;
      }
#ifdef FT_DEBUG_LEVEL_TRACE
      else
        FT_TRACE2(( "  %c%c%c%c  %08lx  %08lx  %08lx",
                    (FT_Char)( entry.Tag >> 24 ),
                    (FT_Char)( entry.Tag >> 16 ),
                    (FT_Char)( entry.Tag >> 8  ),
                    (FT_Char)( entry.Tag       ),
                    entry.Offset,
                    entry.Length,
                    entry.CheckSum ));
#endif
 
      /* ignore duplicate tables – the first one wins */
      duplicate = 0;
      for ( i = 0; i < valid_entries; i++ )
      {
        if ( face->dir_tables[i].Tag == entry.Tag )
        {
          duplicate = 1;
          break;
        }
      }
      if ( duplicate )
      {
        FT_TRACE2(( "  (duplicate, ignored)\n" ));
        continue;
      }
      else
      {
        FT_TRACE2(( "\n" ));
 
        /* we finally have a valid entry */
        face->dir_tables[valid_entries++] = entry;
      }
    }
 
    /* final adjustment to number of tables */
    face->num_tables = valid_entries;
 
    FT_FRAME_EXIT();
 
    FT_TRACE2(( "table directory loaded\n\n" ));
 
  Exit:
    return error;
  }

tt_face_load_gasp()

tt_face_load_gasp	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 1369 of file ttload.c.

  {
    FT_Error   error;
    FT_Memory  memory = stream->memory;
 
    FT_UInt        j,num_ranges;
    TT_GaspRange   gaspranges = NULL;
 
 
    /* the gasp table is optional */
    error = face->goto_table( face, TTAG_gasp, stream, 0 );
    if ( error )
      goto Exit;
 
    if ( FT_FRAME_ENTER( 4L ) )
      goto Exit;
 
    face->gasp.version   = FT_GET_USHORT();
    face->gasp.numRanges = FT_GET_USHORT();
 
    FT_FRAME_EXIT();
 
    /* only support versions 0 and 1 of the table */
    if ( face->gasp.version >= 2 )
    {
      face->gasp.numRanges = 0;
      error = FT_THROW( Invalid_Table );
      goto Exit;
    }
 
    num_ranges = face->gasp.numRanges;
    FT_TRACE3(( "numRanges: %u\n", num_ranges ));
 
    if ( FT_QNEW_ARRAY( face->gasp.gaspRanges, num_ranges ) ||
         FT_FRAME_ENTER( num_ranges * 4L )                  )
      goto Exit;
 
    gaspranges = face->gasp.gaspRanges;
 
    for ( j = 0; j < num_ranges; j++ )
    {
      gaspranges[j].maxPPEM  = FT_GET_USHORT();
      gaspranges[j].gaspFlag = FT_GET_USHORT();
 
      FT_TRACE3(( "gaspRange %d: rangeMaxPPEM %5d, rangeGaspBehavior 0x%x\n",
                  j,
                  gaspranges[j].maxPPEM,
                  gaspranges[j].gaspFlag ));
    }
 
    FT_FRAME_EXIT();
 
  Exit:
    return error;
  }

tt_face_load_head()

tt_face_load_head	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 660 of file ttload.c.

  {
    return tt_face_load_generic_header( face, stream, TTAG_head );
  }

tt_face_load_maxp()

tt_face_load_maxp	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 696 of file ttload.c.

  {
    FT_Error        error;
    TT_MaxProfile*  maxProfile = &face->max_profile;
 
    static 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
    };
 
    static 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 value is smaller.              */
 
      if ( maxProfile->maxFunctionDefs < 64 )
        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_name()

tt_face_load_name	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 804 of file ttload.c.

  {
    FT_Error      error;
    FT_Memory     memory = stream->memory;
    FT_ULong      table_pos, table_len;
    FT_ULong      storage_start, storage_limit;
    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_NameRec
 
      /* 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
    };
 
    static const FT_Frame_Field  langTag_record_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_LangTagRec
 
      /* no FT_FRAME_START */
        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*numNameRecords').  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 = FT_THROW( Name_Table_Missing );
      goto Exit;
    }
 
    /* `name' format 1 contains additional language tag records, */
    /* which we load first                                       */
    if ( table->format == 1 )
    {
      if ( FT_STREAM_SEEK( storage_start )            ||
           FT_READ_USHORT( table->numLangTagRecords ) )
        goto Exit;
 
      storage_start += 2 + 4 * table->numLangTagRecords;
 
      /* allocate language tag records array */
      if ( FT_NEW_ARRAY( table->langTags, table->numLangTagRecords ) ||
           FT_FRAME_ENTER( table->numLangTagRecords * 4 )            )
        goto Exit;
 
      /* load language tags */
      {
        TT_LangTag  entry = table->langTags;
        TT_LangTag  limit = entry + table->numLangTagRecords;
 
 
        for ( ; entry < limit; entry++ )
        {
          (void)FT_STREAM_READ_FIELDS( langTag_record_fields, entry );
 
          /* check that the langTag 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->stringLength = 0;
          }
        }
      }
 
      FT_FRAME_EXIT();
 
      (void)FT_STREAM_SEEK( table_pos + 6 );
    }
 
    /* allocate name records array */
    if ( FT_NEW_ARRAY( table->names, table->numNameRecords ) ||
         FT_FRAME_ENTER( table->numNameRecords * 12 )        )
      goto Exit;
 
    /* load name records */
    {
      TT_Name  entry = table->names;
      FT_UInt  count = table->numNameRecords;
 
 
      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 */
          continue;
        }
 
        /* assure that we have a valid language tag ID, and   */
        /* that the corresponding langTag entry is valid, too */
        if ( table->format == 1 && entry->languageID >= 0x8000U )
        {
          if ( entry->languageID - 0x8000U >= table->numLangTagRecords    ||
               !table->langTags[entry->languageID - 0x8000U].stringLength )
          {
            /* invalid entry; ignore it */
            continue;
          }
        }
 
        entry++;
      }
 
      /* reduce array size to the actually used elements */
      count = (FT_UInt)( entry - table->names );
      (void)FT_RENEW_ARRAY( table->names,
                            table->numNameRecords,
                            count );
      table->numNameRecords = count;
    }
 
    FT_FRAME_EXIT();
 
    /* everything went well, update face->num_names */
    face->num_names = (FT_UShort)table->numNameRecords;
 
  Exit:
    return error;
  }

tt_face_load_os2()

tt_face_load_os2	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 1088 of file ttload.c.

  {
    FT_Error  error;
    TT_OS2*   os2;
 
    static 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
    };
 
    /* `OS/2' version 1 and newer */
    static const FT_Frame_Field  os2_fields_extra1[] =
    {
      FT_FRAME_START( 8 ),
        FT_FRAME_ULONG( ulCodePageRange1 ),
        FT_FRAME_ULONG( ulCodePageRange2 ),
      FT_FRAME_END
    };
 
    /* `OS/2' version 2 and newer */
    static 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
    };
 
    /* `OS/2' version 5 and newer */
    static const FT_Frame_Field  os2_fields_extra5[] =
    {
      FT_FRAME_START( 4 ),
        FT_FRAME_USHORT( usLowerOpticalPointSize ),
        FT_FRAME_USHORT( usUpperOpticalPointSize ),
      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;
    os2->usLowerOpticalPointSize = 0;
    os2->usUpperOpticalPointSize = 0xFFFF;
 
    if ( os2->version >= 0x0001 )
    {
      /* only version 1 tables */
      if ( FT_STREAM_READ_FIELDS( os2_fields_extra1, os2 ) )
        goto Exit;
 
      if ( os2->version >= 0x0002 )
      {
        /* only version 2 tables */
        if ( FT_STREAM_READ_FIELDS( os2_fields_extra2, os2 ) )
          goto Exit;
 
        if ( os2->version >= 0x0005 )
        {
          /* only version 5 tables */
          if ( FT_STREAM_READ_FIELDS( os2_fields_extra5, os2 ) )
            goto Exit;
        }
      }
    }
 
    FT_TRACE3(( "sTypoAscender:  %4d\n",   os2->sTypoAscender ));
    FT_TRACE3(( "sTypoDescender: %4d\n",   os2->sTypoDescender ));
    FT_TRACE3(( "usWinAscent:    %4u\n",   os2->usWinAscent ));
    FT_TRACE3(( "usWinDescent:   %4u\n",   os2->usWinDescent ));
    FT_TRACE3(( "fsSelection:    0x%2x\n", os2->fsSelection ));
 
  Exit:
    return error;
  }

tt_face_load_pclt()

tt_face_load_pclt	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 1308 of file ttload.c.

  {
    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_USHORT( SymbolSet ),
        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_post()

tt_face_load_post	(	TT_Face	face,
		FT_Stream	stream
	)

Definition at line 1248 of file ttload.c.

  {
    FT_Error        error;
    TT_Postscript*  post = &face->postscript;
 
    static const FT_Frame_Field  post_fields[] =
    {
#undef  FT_STRUCTURE
#define FT_STRUCTURE  TT_Postscript
 
      FT_FRAME_START( 32 ),
        FT_FRAME_LONG ( FormatType ),
        FT_FRAME_LONG ( italicAngle ),
        FT_FRAME_SHORT( underlinePosition ),
        FT_FRAME_SHORT( underlineThickness ),
        FT_FRAME_ULONG( isFixedPitch ),
        FT_FRAME_ULONG( minMemType42 ),
        FT_FRAME_ULONG( maxMemType42 ),
        FT_FRAME_ULONG( minMemType1 ),
        FT_FRAME_ULONG( maxMemType1 ),
      FT_FRAME_END
    };
 
 
    error = face->goto_table( face, TTAG_post, stream, 0 );
    if ( error )
      return error;
 
    if ( FT_STREAM_READ_FIELDS( post_fields, post ) )
      return error;
 
    /* we don't load the glyph names, we do that in another */
    /* module (ttpost).                                     */
 
    FT_TRACE3(( "FormatType:   0x%x\n", post->FormatType ));
    FT_TRACE3(( "isFixedPitch:   %s\n", post->isFixedPitch
                                        ? "  yes" : "   no" ));
 
    return FT_Err_Ok;
  }

tt_face_lookup_table()

FT_BEGIN_HEADER tt_face_lookup_table	(	TT_Face	face,
		FT_ULong	tag
	)

Definition at line 56 of file ttload.c.

  {
    TT_Table  entry;
    TT_Table  limit;
#ifdef FT_DEBUG_LEVEL_TRACE
    FT_Bool   zero_length = FALSE;
#endif
 
 
    FT_TRACE4(( "tt_face_lookup_table: %08p, `%c%c%c%c' -- ",
                face,
                (FT_Char)( tag >> 24 ),
                (FT_Char)( tag >> 16 ),
                (FT_Char)( tag >> 8  ),
                (FT_Char)( tag       ) ));
 
    entry = face->dir_tables;
    limit = entry + face->num_tables;
 
    for ( ; entry < limit; entry++ )
    {
      /* For compatibility with Windows, we consider    */
      /* zero-length tables the same as missing tables. */
      if ( entry->Tag == tag )
      {
        if ( entry->Length != 0 )
        {
          FT_TRACE4(( "found table.\n" ));
          return entry;
        }
#ifdef FT_DEBUG_LEVEL_TRACE
        zero_length = TRUE;
#endif
      }
    }
 
#ifdef FT_DEBUG_LEVEL_TRACE
    if ( zero_length )
      FT_TRACE4(( "ignoring empty table\n" ));
    else
      FT_TRACE4(( "could not find table\n" ));
#endif
 
    return NULL;
  }

Referenced by sfnt_load_face(), tt_face_goto_table(), and tt_face_load_any().