mirror of https://github.com/moparisthebest/k-9
150 lines
4.2 KiB
Java
150 lines
4.2 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2001 Lapo Luchini.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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3. The names of the authors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS
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OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This program is based on zlib-1.1.3, so all credit should go authors
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* Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
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* and contributors of zlib.
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*/
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package com.jcraft.jzlib;
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import java.io.*;
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public class ZInputStream extends FilterInputStream {
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protected ZStream z=new ZStream();
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protected int bufsize=512;
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protected int flush=JZlib.Z_NO_FLUSH;
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protected byte[] buf=new byte[bufsize],
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buf1=new byte[1];
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protected boolean compress;
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protected InputStream in=null;
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public ZInputStream(InputStream in) {
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this(in, false);
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}
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public ZInputStream(InputStream in, boolean nowrap) {
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super(in);
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this.in=in;
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z.inflateInit(nowrap);
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compress=false;
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z.next_in=buf;
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z.next_in_index=0;
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z.avail_in=0;
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}
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public ZInputStream(InputStream in, int level) {
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super(in);
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this.in=in;
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z.deflateInit(level);
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compress=true;
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z.next_in=buf;
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z.next_in_index=0;
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z.avail_in=0;
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}
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/*public int available() throws IOException {
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return inf.finished() ? 0 : 1;
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}*/
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public int read() throws IOException {
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if(read(buf1, 0, 1)==-1)
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return(-1);
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return(buf1[0]&0xFF);
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}
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private boolean nomoreinput=false;
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public int read(byte[] b, int off, int len) throws IOException {
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if(len==0)
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return(0);
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int err;
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z.next_out=b;
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z.next_out_index=off;
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z.avail_out=len;
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do {
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if((z.avail_in==0)&&(!nomoreinput)) { // if buffer is empty and more input is avaiable, refill it
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z.next_in_index=0;
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z.avail_in=in.read(buf, 0, bufsize);//(bufsize<z.avail_out ? bufsize : z.avail_out));
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if(z.avail_in==-1) {
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z.avail_in=0;
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nomoreinput=true;
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}
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}
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if(compress)
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err=z.deflate(flush);
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else
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err=z.inflate(flush);
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if(nomoreinput&&(err==JZlib.Z_BUF_ERROR))
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return(-1);
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if(err!=JZlib.Z_OK && err!=JZlib.Z_STREAM_END)
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throw new ZStreamException((compress ? "de" : "in")+"flating: "+z.msg);
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if((nomoreinput||err==JZlib.Z_STREAM_END)&&(z.avail_out==len))
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return(-1);
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}
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while(z.avail_out==len&&err==JZlib.Z_OK);
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//System.err.print("("+(len-z.avail_out)+")");
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return(len-z.avail_out);
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}
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public long skip(long n) throws IOException {
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int len=512;
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if(n<len)
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len=(int)n;
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byte[] tmp=new byte[len];
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return((long)read(tmp));
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}
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public int getFlushMode() {
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return(flush);
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}
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public void setFlushMode(int flush) {
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this.flush=flush;
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}
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/**
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* Returns the total number of bytes input so far.
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*/
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public long getTotalIn() {
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return z.total_in;
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}
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/**
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* Returns the total number of bytes output so far.
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*/
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public long getTotalOut() {
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return z.total_out;
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}
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public void close() throws IOException{
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in.close();
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}
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}
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