File: PreLzssDecoder.java

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//start of PreLzssDecoder.java
//TEXT_STYLE:CODE=Shift_JIS(Japanese):RET_CODE=CRLF

/**
 * PreLzssDecoder.java
 * 
 * Copyright (C) 2001  Michel Ishizuka  All rights reserved.
 * 
 * ȉ̏ɓӂȂ΃\[XƃoCi`̍ĔzzƎgp
 * ύX̗Lɂ炸‚B
 * 
 * PD\[XR[h̍ĔzzɂĒ쌠\ ̏̃Xg
 *     щL̐ێȂĂ͂ȂȂB
 * 
 * QDoCi`̍ĔzzɂĒ쌠\ ̏̃Xg
 *     щL̐gp ̑̔zz
 *     ܂ގɋLqȂ΂ȂȂB
 * 
 * ̃\tgEFA͐Β˔ڂɂĖۏ؂Œ񋟂A̖
 * IBłƂۏ؁AilLƂۏ؂ɂƂǂ܂炸A
 * Ȃ閾IшÎIȕۏ؂ȂB
 * Β˔ڂ ̃\tgEFA̎gpɂ钼ړIAԐړIA
 * IAȁAT^IȁA邢͕KRIȑQ(gpɂf[^
 * AƖ̒f〈܂Ăv̈⎸A֐i
 * T[rX̓l邪AĂꂾɌ肳Ȃ
 * Q)ɑ΂āAȂ鎖Ԃ̌ƂȂƂĂA_̐
 * C△ߎӔC܂ ȂӔC낤ƂAƂꂪs
 * ŝׂ߂łƂĂA܂͂̂悤ȑQ̉”\
 * ĂƂĂ؂̐ӔC𕉂Ȃ̂ƂB
 */

package jp.gr.java_conf.dangan.util.lha;

//import classes and interfaces

//import exceptions
import java.io.IOException;
import java.io.EOFException;

/**
 * LZSSkR[hC^[tFCXB
 * 
 * <pre>
 * -- revision history --
 * $Log: PreLzssDecoder.java,v $
 * Revision 1.0  2002/07/25 00:00:00  dangan
 * add to version control
 * [maintenance]
 *     \[X
 *     ^up~
 *     CZX̏C
 *
 * </pre>
 * 
 * @author  $Author: dangan $
 * @version $Revision: 1.0 $
 */
public interface PreLzssDecoder{


    //------------------------------------------------------------------
    //  original method ( on the model of java.io.InputStream )
    //------------------------------------------------------------------
    //  mark/reset
    //------------------------------------------------------------------
    //  public abstract void mark( int readLimit )
    //  public abstract void reset()
    //  public abstract boolean markSupported()
    //------------------------------------------------------------------
    /**
     * ڑꂽ̓Xg[݈̌ʒuɃ}[Nݒ肵A
     * reset() \bhŃ}[N_̓ǂݍ݈ʒuɖ߂悤ɂB<br>
     * InputStream  mark() ƈႢA readLimit Őݒ肵
     * EoCgOɃ}[NʒuɂȂĂ܂ȂB
     * AreadLimit 𖳎Ė reset() ”\ 
     * InputStream ƐڑĂꍇ readLimit ɂǂ̂悤Ȓlݒ肳Ă
     * reset() ŕK}[NʒuɕłȂ΂ȂȂB<br>
     * 
     * @param readLimit }[Nʒuɖ߂ẼoCgB
     *                  ̃oCg𒴂ăf[^ǂݍ񂾏ꍇ 
     *                  reset()łȂȂ”\B<br>
     */
    public abstract void mark( int readLimit );

    /**
     * ڑꂽ̓Xg[̓ǂݍ݈ʒuŌ
     * mark() \bhĂяoꂽƂ̈ʒuɐݒ肷B<br>
     * 
     * @exception IOException o̓G[ꍇ
     */
    public abstract void reset() throws IOException;

    /**
     * ڑꂽ̓Xg[ mark()  reset() 
     * T|[g邩𓾂B<br>
     * 
     * @return Xg[ mark()  reset() 
     *         T|[gꍇ trueB<br>
     *         T|[gȂꍇ falseB<br>
     */
    public abstract boolean markSupported();


    //------------------------------------------------------------------
    //  original method ( on the model of java.io.InputStream )
    //------------------------------------------------------------------
    //  other method
    //------------------------------------------------------------------
    //  public abstract int available()
    //  public abstract void close()
    //------------------------------------------------------------------
    /**
     * ڑꂽ̓Xg[ubNȂ
     * ǂݍނƂ̂łŒoCg𓾂B<br>
     * ̐l͊Sł鎖ۏႵȂĂ悢B
     * ͌̈ӂɍ쐬ꂽf[^ł̓ubN
     * ǂݍގ̏oŒoCg𓾂ɂ
     * ۂɓǂݍł݂ȊOɕ@Ȃ߂łB
     * 
     * @return ubNȂœǂݏoŒoCgB<br>
     * 
     * @exception IOException o̓G[ꍇ
     */
    public abstract int available() throws IOException;

    /**
     * ̓̓Xg[‚AgpĂ
     * SẴ\[XJB<br>
     * 
     * @exception IOException o̓G[ꍇ
     */
    public abstract void close() throws IOException;


    //------------------------------------------------------------------
    //  original method
    //------------------------------------------------------------------
    //  read
    //------------------------------------------------------------------
    //  public abstract int readCode()
    //  public abstract int readOffset()
    //------------------------------------------------------------------
    /**
     * 1byte  LZSSk̃f[^́A
     * LZSS ňkꂽkR[ĥvǂݍށB<br>
     * kf[^ 0`255A
     * LZSSkR[h(v) 256`511 ̒lȂ΂ȂȂB<br>
     * 
     * @return 1byte  LZSSk̃f[^́A
     *         LZSS ňkꂽkR[ĥv
     * 
     * @exception IOException  o̓G[ꍇ
     * @exception EOFException EndOfStreamɒBꍇ<br>
     */
    public abstract int readCode() throws IOException;

    /**
     * LZSS ňkꂽkR[ĥvʒuǂݍށB<br>
     * 
     * @return LZSS ňkꂽkR[ĥvʒu
     * 
     * @exception IOException o̓G[ꍇ
     */
    public abstract int readOffset() throws IOException;


    //------------------------------------------------------------------
    //  original method
    //------------------------------------------------------------------
    //  get LZSS parameter
    //------------------------------------------------------------------
    //  public abstract int getDictionarySize()
    //  public abstract int getMaxMatch()
    //  public abstract int getThreshold()
    //------------------------------------------------------------------
    /**
     * PreLzssDecoderLZSS̃TCY𓾂B
     * 
     * @return LZSS̃TCY
     */
    public abstract int getDictionarySize();

    /**
     * PreLzssDecoderŒv𓾂B
     * 
     * @return Œv
     */
    public abstract int getMaxMatch();

    /**
     * PreLzssDecoder鈳kA񈳏k臒l𓾂B
     * 
     * @return LZSS臒l
     */
    public abstract int getThreshold();

}
//end of PreLzssDecoder.java