private int fill() throws IOException {
        this.index = 0;
        this.count = this.reader.read(this.buffer, 0, this.buffer.length);
        return this.count;
    }
private int fill ( ) throws IOException { this . index = 0 ; this . count = this . reader . read ( this . buffer , 0 , this . buffer . length ) ; return this . count ; }
@return int
@throws IOException