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/*
 * Copyright (C) 2007 Steve Ratcliffe
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *
 * Author: Steve Ratcliffe
 * Create date: 14-Jan-2007
 */

package uk.me.parabola.imgfmt.app.labelenc;

/**
 * Interface for decoding characters for use in the Label section of a .img
 * file.
 *
 * These things are stateful, you add bytes read from the file to them and
 * they return a status when a complete label has been obtained.  At this point
 * you retrieve the text.
 *
 * @author Steve Ratcliffe
 */

public interface CharacterDecoder {

        /**
         * Add a byte to this decoder.  This will be saved until a complete
         * label string has been detected.
         *
         * @param b The byte read from the lbl file.
         * @return True if a label string is finished and is ready to be retrieved
         * via the {@link #getText} method.
         */

        public boolean addByte(int b);

        /**
         * Get the valid text.  This is guaranteed to be encoded as utf-8.
         *
         * @return The byte array and length as an EncodedText struct.
         */

        public DecodedText getText();

        /**
         * Resets the state.  This should be called for example if the reader is
         * jumping to a new place in the file and cannot guarantee that the
         * previous label was fully read.
         */

        public void reset();
}