145 lines
4.3 KiB
Java
145 lines
4.3 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
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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 JCRAFT,
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INC. 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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package com.jcraft.jzlib;
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import java.io.*;
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public class GZIPInputStream extends InflaterInputStream {
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public GZIPInputStream(InputStream in) throws IOException {
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this(in, DEFAULT_BUFSIZE, true);
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}
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public GZIPInputStream(InputStream in,
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int size,
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boolean close_in) throws IOException {
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this(in, new Inflater(15+16), size, close_in);
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myinflater = true;
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}
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public GZIPInputStream(InputStream in,
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Inflater inflater,
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int size,
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boolean close_in) throws IOException {
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super(in, inflater, size, close_in);
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}
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public long getModifiedtime() {
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return inflater.istate.getGZIPHeader().getModifiedTime();
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}
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public int getOS() {
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return inflater.istate.getGZIPHeader().getOS();
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}
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public String getName() {
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return inflater.istate.getGZIPHeader().getName();
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}
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public String getComment() {
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return inflater.istate.getGZIPHeader().getComment();
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}
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public long getCRC() throws GZIPException {
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if(inflater.istate.mode != 12 /*DONE*/)
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throw new GZIPException("checksum is not calculated yet.");
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return inflater.istate.getGZIPHeader().getCRC();
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}
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public void readHeader() throws IOException {
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byte[] empty = "".getBytes();
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inflater.setOutput(empty, 0, 0);
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inflater.setInput(empty, 0, 0, false);
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byte[] b = new byte[10];
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int n = fill(b);
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if(n!=10){
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if(n>0){
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inflater.setInput(b, 0, n, false);
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//inflater.next_in_index = n;
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inflater.next_in_index = 0;
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inflater.avail_in = n;
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}
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throw new IOException("no input");
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}
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inflater.setInput(b, 0, n, false);
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byte[] b1 = new byte[1];
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do{
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if(inflater.avail_in<=0){
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int i = in.read(b1);
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if(i<=0)
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throw new IOException("no input");
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inflater.setInput(b1, 0, 1, true);
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}
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int err = inflater.inflate(JZlib.Z_NO_FLUSH);
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if(err!=0/*Z_OK*/){
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int len = 2048-inflater.next_in.length;
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if(len>0){
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byte[] tmp = new byte[len];
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n = fill(tmp);
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if(n>0){
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inflater.avail_in += inflater.next_in_index;
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inflater.next_in_index = 0;
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inflater.setInput(tmp, 0, n, true);
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}
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}
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//inflater.next_in_index = inflater.next_in.length;
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inflater.avail_in += inflater.next_in_index;
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inflater.next_in_index = 0;
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throw new IOException(inflater.msg);
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}
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}
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while(inflater.istate.inParsingHeader());
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}
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private int fill(byte[] buf) {
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int len = buf.length;
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int n = 0;
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do{
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int i = -1;
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try {
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i = in.read(buf, n, buf.length - n);
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}
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catch(IOException e){
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}
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if(i == -1){
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break;
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}
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n+=i;
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}
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while(n<len);
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return n;
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}
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} |