/* -*-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
GZIPInputStream extends
InflaterInputStream {
public
GZIPInputStream(
InputStream in) throws
IOException {
this(
in,
DEFAULT_BUFSIZE, true);
}
public
GZIPInputStream(
InputStream in,
int
size,
boolean
close_in) throws
IOException {
this(
in, new
Inflater(15+16),
size,
close_in);
myinflater = true;
}
public
GZIPInputStream(
InputStream in,
Inflater inflater,
int
size,
boolean
close_in) throws
IOException {
super(
in,
inflater,
size,
close_in);
}
public long
getModifiedtime() {
return
inflater.
istate.
getGZIPHeader().
getModifiedTime();
}
public int
getOS() {
return
inflater.
istate.
getGZIPHeader().
getOS();
}
public
String getName() {
return
inflater.
istate.
getGZIPHeader().
getName();
}
public
String getComment() {
return
inflater.
istate.
getGZIPHeader().
getComment();
}
public long
getCRC() throws
GZIPException {
if(
inflater.
istate.
mode != 12 /*DONE*/)
throw new
GZIPException("checksum is not calculated yet.");
return
inflater.
istate.
getGZIPHeader().
getCRC();
}
public void
readHeader() throws
IOException {
byte[]
empty = "".
getBytes();
inflater.
setOutput(
empty, 0, 0);
inflater.
setInput(
empty, 0, 0, false);
byte[]
b = new byte[10];
int
n =
fill(
b);
if(
n!=10){
if(
n>0){
inflater.
setInput(
b, 0,
n, false);
//inflater.next_in_index = n;
inflater.
next_in_index = 0;
inflater.
avail_in =
n;
}
throw new
IOException("no input");
}
inflater.
setInput(
b, 0,
n, false);
byte[]
b1 = new byte[1];
do{
if(
inflater.
avail_in<=0){
int
i =
in.
read(
b1);
if(
i<=0)
throw new
IOException("no input");
inflater.
setInput(
b1, 0, 1, true);
}
int
err =
inflater.
inflate(
JZlib.
Z_NO_FLUSH);
if(
err!=0/*Z_OK*/){
int
len = 2048-
inflater.
next_in.length;
if(
len>0){
byte[]
tmp = new byte[
len];
n =
fill(
tmp);
if(
n>0){
inflater.
avail_in +=
inflater.
next_in_index;
inflater.
next_in_index = 0;
inflater.
setInput(
tmp, 0,
n, true);
}
}
//inflater.next_in_index = inflater.next_in.length;
inflater.
avail_in +=
inflater.
next_in_index;
inflater.
next_in_index = 0;
throw new
IOException(
inflater.
msg);
}
}
while(
inflater.
istate.
inParsingHeader());
}
private int
fill(byte[]
buf) {
int
len =
buf.length;
int
n = 0;
do{
int
i = -1;
try {
i =
in.
read(
buf,
n,
buf.length -
n);
}
catch(
IOException e){
}
if(
i == -1){
break;
}
n+=
i;
}
while(
n<
len);
return
n;
}
}