ttpost.c

qt-embedded-2.3.8.tar.gz源码

  Fail:
    FREE( name_strings );
    FREE( glyph_indices );

  Exit:
    return error;
  }


  static
  FT_Error  Load_Format_25( TT_Face    face,
                            FT_Stream  stream )
  {
    FT_Memory  memory = stream->memory;
    FT_Error   error;

    FT_Int     num_glyphs;
    FT_Char*   offset_table = 0;


    /* UNDOCUMENTED!  This value appears only in the Apple TT specs. */
    if ( READ_UShort( num_glyphs ) )
      goto Exit;

    /* check the number of glyphs */
    if ( num_glyphs > face->root.num_glyphs || num_glyphs > 258 )
    {
      error = TT_Err_Invalid_File_Format;
      goto Exit;
    }

    if ( ALLOC    ( offset_table, num_glyphs ) ||
         FILE_Read( offset_table, num_glyphs ) )
      goto Fail;

    /* now check the offset table */
    {
      FT_Int  n;


      for ( n = 0; n < num_glyphs; n++ )
      {
        FT_Long  index = (FT_Long)n + offset_table[n];


        if ( index < 0 || index > num_glyphs )
        {
          error = TT_Err_Invalid_File_Format;
          goto Fail;
        }
      }
    }

    /* OK, set table fields and exit successfuly */
    {
      TT_Post_25*  table = &face->postscript_names.names.format_25;


      table->num_glyphs = num_glyphs;
      table->offsets    = offset_table;
    }

    return TT_Err_Ok;

  Fail:
    FREE( offset_table );

  Exit:
    return error;
  }


  static
  FT_Error  Load_Post_Names( TT_Face  face )
  {
    FT_Stream  stream;
    FT_Error   error;
    FT_Fixed   format;


    /* get a stream for the face's resource */
    stream = face->root.stream;

    /* seek to the beginning of the PS names table */
    error = face->goto_table( face, TTAG_post, stream, 0 );
    if ( error )
      goto Exit;

    format = face->postscript.FormatType;

    /* go to beginning of subtable */
    if ( FILE_Skip( 32 ) )
      goto Exit;

    /* now read postscript table */
    switch ( format )
    {
    case 0x00020000L:
      error = Load_Format_20( face, stream );
      break;

    case 0x00028000L:
      error = Load_Format_25( face, stream );
      break;

    default:
      error = TT_Err_Invalid_File_Format;
    }

    face->postscript_names.loaded = 1;

  Exit:
    return error;
  }


  FT_LOCAL_DEF
  void  TT_Free_Post_Names( TT_Face  face )
  {
    FT_Memory       memory = face->root.memory;
    TT_Post_Names*  names  = &face->postscript_names;


    if ( names->loaded )
    {
      switch ( face->postscript.FormatType )
      {
      case 0x00020000L:
        {
          TT_Post_20*  table = &names->names.format_20;
          FT_UShort    n;


          FREE( table->glyph_indices );
          table->num_glyphs = 0;

          for ( n = 0; n < table->num_names; n++ )
            FREE( table->glyph_names[n] );

          FREE( table->glyph_names );
          table->num_names = 0;
        }
        break;

      case 0x00028000L:
        {
          TT_Post_25*  table = &names->names.format_25;


          FREE( table->offsets );
          table->num_glyphs = 0;
        }
        break;
      }
    }
    names->loaded = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    TT_Get_PS_Name                                                     */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Gets the PostScript glyph name of a glyph.                         */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face   :: A handle to the parent face.                             */
  /*                                                                       */
  /*    index  :: The glyph index.                                         */
  /*                                                                       */
  /*    PSname :: The address of a string pointer.  Will be NULL in case   */
  /*              of error, otherwise it is a pointer to the glyph name.   */
  /*                                                                       */
  /*              You must not modify the returned string!                 */
  /*                                                                       */
  /* <Output>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
  FT_LOCAL_DEF
  FT_Error  TT_Get_PS_Name( TT_Face      face,
                            FT_UInt      index,
                            FT_String**  PSname )
  {
    FT_Error            error;
    TT_Post_Names*      names;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    PSNames_Interface*  psnames;
#endif


    if ( !face )
      return TT_Err_Invalid_Face_Handle;

    if ( index >= (FT_UInt)face->root.num_glyphs )
      return TT_Err_Invalid_Glyph_Index;

#ifdef FT_CONFIG_OPTION_POSTSCRIPT_NAMES
    psnames = (PSNames_Interface*)face->psnames;
    if ( !psnames )
      return TT_Err_Unimplemented_Feature;
#endif

    names = &face->postscript_names;

    /* `.notdef' by default */
    *PSname = MAC_NAME( 0 );

    switch ( face->postscript.FormatType )
    {
    case 0x00010000L:
      if ( index < 258 )                    /* paranoid checking */
        *PSname = MAC_NAME( index );
      break;

    case 0x00020000L:
      {
        TT_Post_20*  table = &names->names.format_20;


        if ( !names->loaded )
        {
          error = Load_Post_Names( face );
          if ( error )
            break;
        }

        if ( index < (FT_UInt)table->num_glyphs )
        {
          FT_UShort  name_index = table->glyph_indices[index];


          if ( name_index < 258 )
            *PSname = MAC_NAME( name_index );
          else
            *PSname = (FT_String*)table->glyph_names[name_index - 258];
        }
      }
      break;

    case 0x00028000L:
      {
        TT_Post_25*  table = &names->names.format_25;


        if ( !names->loaded )
        {
          error = Load_Post_Names( face );
          if ( error )
            break;
        }

        if ( index < (FT_UInt)table->num_glyphs )    /* paranoid checking */
        {
          index  += table->offsets[index];
          *PSname = MAC_NAME( index );
        }
      }
      break;

    case 0x00030000L:
      break;                                /* nothing to do */
    }

    return TT_Err_Ok;
  }


/* END */