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/*
 * Copyright (c) 2008, Harald Kuhr
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.twelvemonkeys.io.enc;

import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/**
 * Interface for decoders.
 * A {@code Decoder} may be used with a {@code DecoderStream}, to perform
 * on-the-fly decoding from an {@code InputStream}.
 * 
 * Important note: Decoder implementations are typically not synchronized.
 * 
 *
 * @see Encoder
 * @see DecoderStream
 *
 * @author Harald Kuhr
 * @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/io/enc/Decoder.java#2 $
 */
public interface Decoder {
    
    /**
     * Decodes up to {@code buffer.length} bytes from the given input stream,
     * into the given buffer.
     *
     * @param stream the input stream to decode data from
     * @param buffer buffer to store the read data
     *
     * @return the total number of bytes read into the buffer, or {@code 0}
     * if there is no more data because the end of the stream has been reached.
     *
     * @throws DecodeException if encoded data is corrupt.
     * @throws IOException if an I/O error occurs.
     * @throws java.io.EOFException if a premature end-of-file is encountered.
     * @throws java.lang.NullPointerException if either argument is {@code null}.
     */
    int decode(InputStream stream, ByteBuffer buffer) throws IOException;
}