org.xbib.io.compress.zlib.ZInputStream Maven / Gradle / Ivy

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package org.xbib.io.compress.zlib;

import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;

public class ZInputStream extends FilterInputStream {

    protected ZStream z = new ZStream();
    protected int flush = ZConstants.Z_NO_FLUSH;
    protected byte[] buf;
    protected byte[] buf1 = new byte[1];
    protected boolean compress;
    private int bufsize;

    public ZInputStream(InputStream in) {
        this(in, false);
    }

    public ZInputStream(InputStream in, boolean nowrap) {
        super(in);
        this.bufsize = 512;
        this.buf = new byte[bufsize];
        z.inflateInit(nowrap);
        compress = false;
        z.nextin = buf;
        z.nextinindex = 0;
        z.availin = 0;
    }

    public ZInputStream(InputStream in, int bufsize) {
        super(in);
        this.bufsize = bufsize;
        this.buf = new byte[bufsize];
        z.inflateInit(false);
        compress = false;
        z.nextin = buf;
        z.nextinindex = 0;
        z.availin = 0;
    }

    public void level(int level) {
        z.deflateInit(level);
    }

    @Override
    public int read() throws IOException {
        if (read(buf1, 0, 1) == -1) {
            return (-1);
        }
        return (buf1[0] & 0xFF);
    }

    private boolean nomoreinput = false;

    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        if (len == 0) {
            return (0);
        }
        int err;
        z.nextout = b;
        z.nextoutindex = off;
        z.availout = len;
        do {
            if ((z.availin == 0) && (!nomoreinput)) { // if buffer is empty and more input is avaiable, refill it
                z.nextinindex = 0;
                z.availin = in.read(buf, 0, bufsize);//(bufsize