line source
+ − /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
+ − /*
+ − Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
+ −
+ − Redistribution and use in source and binary forms, with or without
+ − modification, are permitted provided that the following conditions are met:
+ −
+ − 1. Redistributions of source code must retain the above copyright notice,
+ − this list of conditions and the following disclaimer.
+ −
+ − 2. 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.
+ −
+ − 3. The names of the authors may not be used to endorse or promote products
+ − derived from this software without specific prior written permission.
+ −
+ − THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 JCRAFT,
+ − INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE 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.jcraft.jzlib;
+ − import java.io.*;
+ −
+ − public class InflaterInputStream extends FilterInputStream {
+ − protected final Inflater inflater;
+ − protected byte[] buf;
+ −
+ − private boolean closed = false;
+ −
+ − private boolean eof = false;
+ −
+ − private boolean close_in = true;
+ −
+ − protected static final int DEFAULT_BUFSIZE = 512;
+ −
+ − public InflaterInputStream(InputStream in) throws IOException {
+ − this(in, false);
+ − }
+ −
+ − public InflaterInputStream(InputStream in, boolean nowrap) throws IOException {
+ − this(in, new Inflater(nowrap));
+ − myinflater = true;
+ − }
+ −
+ − public InflaterInputStream(InputStream in, Inflater inflater) throws IOException {
+ − this(in, inflater, DEFAULT_BUFSIZE);
+ − }
+ −
+ − public InflaterInputStream(InputStream in,
+ − Inflater inflater, int size) throws IOException {
+ − this(in, inflater, size, true);
+ − }
+ −
+ − public InflaterInputStream(InputStream in,
+ − Inflater inflater,
+ − int size, boolean close_in) throws IOException {
+ − super(in);
+ − if (in == null || inflater == null) {
+ − throw new NullPointerException();
+ − }
+ − else if (size <= 0) {
+ − throw new IllegalArgumentException("buffer size must be greater than 0");
+ − }
+ − this.inflater = inflater;
+ − buf = new byte[size];
+ − this.close_in = close_in;
+ − }
+ −
+ − protected boolean myinflater = false;
+ −
+ − private byte[] byte1 = new byte[1];
+ −
+ − public int read() throws IOException {
+ − if (closed) { throw new IOException("Stream closed"); }
+ − return read(byte1, 0, 1) == -1 ? -1 : byte1[0] & 0xff;
+ − }
+ −
+ − public int read(byte[] b, int off, int len) throws IOException {
+ − if (closed) { throw new IOException("Stream closed"); }
+ − if (b == null) {
+ − throw new NullPointerException();
+ − }
+ − else if (off < 0 || len < 0 || len > b.length - off) {
+ − throw new IndexOutOfBoundsException();
+ − }
+ − else if (len == 0) {
+ − return 0;
+ − }
+ − else if (eof) {
+ − return -1;
+ − }
+ −
+ − int n = 0;
+ − inflater.setOutput(b, off, len);
+ − while(!eof) {
+ − if(inflater.avail_in==0)
+ − fill();
+ − int err = inflater.inflate(JZlib.Z_NO_FLUSH);
+ − n += inflater.next_out_index - off;
+ − off = inflater.next_out_index;
+ − switch(err) {
+ − case JZlib.Z_DATA_ERROR:
+ − throw new IOException(inflater.msg);
+ − case JZlib.Z_STREAM_END:
+ − case JZlib.Z_NEED_DICT:
+ − eof = true;
+ − if(err == JZlib.Z_NEED_DICT)
+ − return -1;
+ − break;
+ − default:
+ − }
+ − if(inflater.avail_out==0)
+ − break;
+ − }
+ − return n;
+ − }
+ −
+ − public int available() throws IOException {
+ − if (closed) { throw new IOException("Stream closed"); }
+ − if (eof) {
+ − return 0;
+ − }
+ − else {
+ − return 1;
+ − }
+ − }
+ −
+ − private byte[] b = new byte[512];
+ −
+ − public long skip(long n) throws IOException {
+ − if (n < 0) {
+ − throw new IllegalArgumentException("negative skip length");
+ − }
+ −
+ − if (closed) { throw new IOException("Stream closed"); }
+ −
+ − int max = (int)Math.min(n, Integer.MAX_VALUE);
+ − int total = 0;
+ − while (total < max) {
+ − int len = max - total;
+ − if (len > b.length) {
+ − len = b.length;
+ − }
+ − len = read(b, 0, len);
+ − if (len == -1) {
+ − eof = true;
+ − break;
+ − }
+ − total += len;
+ − }
+ − return total;
+ − }
+ −
+ − public void close() throws IOException {
+ − if (!closed) {
+ − if (myinflater)
+ − inflater.end();
+ − if(close_in)
+ − in.close();
+ − closed = true;
+ − }
+ − }
+ −
+ − protected void fill() throws IOException {
+ − if (closed) { throw new IOException("Stream closed"); }
+ − int len = in.read(buf, 0, buf.length);
+ − if (len == -1) {
+ − if(inflater.istate.wrap == 0 &&
+ − !inflater.finished()){
+ − buf[0]=0;
+ − len=1;
+ − }
+ − else if(inflater.istate.was != -1){ // in reading trailer
+ − throw new IOException("footer is not found");
+ − }
+ − else{
+ − throw new EOFException("Unexpected end of ZLIB input stream");
+ − }
+ − }
+ − inflater.setInput(buf, 0, len, true);
+ − }
+ −
+ − public boolean markSupported() {
+ − return false;
+ − }
+ −
+ − public synchronized void mark(int readlimit) {
+ − }
+ −
+ − public synchronized void reset() throws IOException {
+ − throw new IOException("mark/reset not supported");
+ − }
+ −
+ − public long getTotalIn() {
+ − return inflater.getTotalIn();
+ − }
+ −
+ − public long getTotalOut() {
+ − return inflater.getTotalOut();
+ − }
+ −
+ − public byte[] getAvailIn() {
+ − if(inflater.avail_in<=0)
+ − return null;
+ − byte[] tmp = new byte[inflater.avail_in];
+ − System.arraycopy(inflater.next_in, inflater.next_in_index,
+ − tmp, 0, inflater.avail_in);
+ − return tmp;
+ − }
+ −
+ − public void readHeader() throws IOException {
+ −
+ − byte[] empty = "".getBytes();
+ − inflater.setInput(empty, 0, 0, false);
+ − inflater.setOutput(empty, 0, 0);
+ −
+ − int err = inflater.inflate(JZlib.Z_NO_FLUSH);
+ − if(!inflater.istate.inParsingHeader()){
+ − return;
+ − }
+ −
+ − byte[] b1 = new byte[1];
+ − do{
+ − int i = in.read(b1);
+ − if(i<=0)
+ − throw new IOException("no input");
+ − inflater.setInput(b1);
+ − err = inflater.inflate(JZlib.Z_NO_FLUSH);
+ − if(err!=0/*Z_OK*/)
+ − throw new IOException(inflater.msg);
+ − }
+ − while(inflater.istate.inParsingHeader());
+ − }
+ −
+ − public Inflater getInflater(){
+ − return inflater;
+ − }
+ − }