view src/com/jcraft/jzlib/ZInputStream.java @ 92:e5259eab903e
remove 5250 configuration
author
Carl Byington <carl@five-ten-sg.com>
date
Mon, 16 Jun 2014 16:22:34 -0700 (2014-06-16)
parents
0ce5cc452d02
children
46c2115ae1c8
line source
+ − /* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
+ − /*
+ − Copyright (c) 2001 Lapo Luchini.
+ −
+ − 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 THE AUTHORS
+ − 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.
+ − */
+ − /*
+ − * This program is based on zlib-1.1.3, so all credit should go authors
+ − * Jean-loup Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu)
+ − * and contributors of zlib.
+ − */
+ −
+ − package com.jcraft.jzlib;
+ − import java.io.*;
+ −
+ − public class ZInputStream extends FilterInputStream {
+ −
+ − protected ZStream z = new ZStream();
+ − protected int bufsize = 512;
+ − protected int flush = JZlib.Z_NO_FLUSH;
+ − protected byte[] buf = new byte[bufsize],
+ − buf1 = new byte[1];
+ − protected boolean compress;
+ −
+ − protected InputStream in = null;
+ −
+ − public ZInputStream(InputStream in) {
+ − this(in, false);
+ − }
+ − public ZInputStream(InputStream in, boolean nowrap) {
+ − super(in);
+ − this.in = in;
+ − z.inflateInit(nowrap);
+ − compress = false;
+ − z.next_in = buf;
+ − z.next_in_index = 0;
+ − z.avail_in = 0;
+ − }
+ −
+ − public ZInputStream(InputStream in, int level) {
+ − super(in);
+ − this.in = in;
+ − z.deflateInit(level);
+ − compress = true;
+ − z.next_in = buf;
+ − z.next_in_index = 0;
+ − z.avail_in = 0;
+ − }
+ −
+ − /*public int available() throws IOException {
+ − return inf.finished() ? 0 : 1;
+ − }*/
+ −
+ − public int read() throws IOException {
+ − if (read(buf1, 0, 1) == -1)
+ − return (-1);
+ −
+ − return (buf1[0] & 0xFF);
+ − }
+ −
+ − private boolean nomoreinput = false;
+ −
+ − public int read(byte[] b, int off, int len) throws IOException {
+ − if (len == 0)
+ − return (0);
+ −
+ − int err;
+ − z.next_out = b;
+ − z.next_out_index = off;
+ − z.avail_out = len;
+ −
+ − do {
+ − if ((z.avail_in == 0) && (!nomoreinput)) { // if buffer is empty and more input is avaiable, refill it
+ − z.next_in_index = 0;
+ − z.avail_in = in.read(buf, 0, bufsize); //(bufsize<z.avail_out ? bufsize : z.avail_out));
+ −
+ − if (z.avail_in == -1) {
+ − z.avail_in = 0;
+ − nomoreinput = true;
+ − }
+ − }
+ −
+ − if (compress)
+ − err = z.deflate(flush);
+ − else
+ − err = z.inflate(flush);
+ −
+ − if (nomoreinput && (err == JZlib.Z_BUF_ERROR))
+ − return (-1);
+ −
+ − if (err != JZlib.Z_OK && err != JZlib.Z_STREAM_END)
+ − throw new ZStreamException((compress ? "de" : "in") + "flating: " + z.msg);
+ −
+ − if ((nomoreinput || err == JZlib.Z_STREAM_END) && (z.avail_out == len))
+ − return (-1);
+ − }
+ − while (z.avail_out == len && err == JZlib.Z_OK);
+ −
+ − //System.err.print("("+(len-z.avail_out)+")");
+ − return (len - z.avail_out);
+ − }
+ −
+ − public long skip(long n) throws IOException {
+ − int len = 512;
+ −
+ − if (n < len)
+ − len = (int)n;
+ −
+ − byte[] tmp = new byte[len];
+ − return ((long)read(tmp));
+ − }
+ −
+ − public int getFlushMode() {
+ − return (flush);
+ − }
+ −
+ − public void setFlushMode(int flush) {
+ − this.flush = flush;
+ − }
+ −
+ − /**
+ − * Returns the total number of bytes input so far.
+ − */
+ − public long getTotalIn() {
+ − return z.total_in;
+ − }
+ −
+ − /**
+ − * Returns the total number of bytes output so far.
+ − */
+ − public long getTotalOut() {
+ − return z.total_out;
+ − }
+ −
+ − public void close() throws IOException {
+ − in.close();
+ − }
+ − }