/* -*-mode:java; c-basic-offset:2; -*- */
/*
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.
*/
/*
* 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.
UnsupportedEncodingException;
/**
* @see "http://www.ietf.org/rfc/rfc1952.txt"
*/
public class
GZIPHeader implements
Cloneable {
public static final byte
OS_MSDOS = (byte) 0x00;
public static final byte
OS_AMIGA = (byte) 0x01;
public static final byte
OS_VMS = (byte) 0x02;
public static final byte
OS_UNIX = (byte) 0x03;
public static final byte
OS_ATARI = (byte) 0x05;
public static final byte
OS_OS2 = (byte) 0x06;
public static final byte
OS_MACOS = (byte) 0x07;
public static final byte
OS_TOPS20 = (byte) 0x0a;
public static final byte
OS_WIN32 = (byte) 0x0b;
public static final byte
OS_VMCMS = (byte) 0x04;
public static final byte
OS_ZSYSTEM = (byte) 0x08;
public static final byte
OS_CPM = (byte) 0x09;
public static final byte
OS_QDOS = (byte) 0x0c;
public static final byte
OS_RISCOS = (byte) 0x0d;
public static final byte
OS_UNKNOWN = (byte) 0xff;
boolean
text = false;
private boolean
fhcrc = false;
long
time;
int
xflags;
int
os = 255;
byte[]
extra;
byte[]
name;
byte[]
comment;
int
hcrc;
long
crc;
boolean
done = false;
long
mtime = 0;
public void
setModifiedTime(long
mtime) {
this.
mtime =
mtime;
}
public long
getModifiedTime() {
return
mtime;
}
public void
setOS(int
os) {
if((0<=
os &&
os <=13) ||
os==255)
this.
os=
os;
else
throw new
IllegalArgumentException("os: "+
os);
}
public int
getOS(){
return
os;
}
public void
setName(
String name) {
try{
this.
name=
name.
getBytes("ISO-8859-1");
}
catch(
UnsupportedEncodingException e){
throw new
IllegalArgumentException("name must be in ISO-8859-1 "+
name);
}
}
public
String getName(){
if(
name==null) return "";
try {
return new
String(
name, "ISO-8859-1");
}
catch (
UnsupportedEncodingException e) {
throw new
InternalError(
e.
toString());
}
}
public void
setComment(
String comment) {
try{
this.
comment=
comment.
getBytes("ISO-8859-1");
}
catch(
UnsupportedEncodingException e){
throw new
IllegalArgumentException("comment must be in ISO-8859-1 "+
name);
}
}
public
String getComment(){
if(
comment==null) return "";
try {
return new
String(
comment, "ISO-8859-1");
}
catch (
UnsupportedEncodingException e) {
throw new
InternalError(
e.
toString());
}
}
public void
setCRC(long
crc){
this.
crc =
crc;
}
public long
getCRC(){
return
crc;
}
void
put(
Deflate d){
int
flag = 0;
if(
text){
flag |= 1; // FTEXT
}
if(
fhcrc){
flag |= 2; // FHCRC
}
if(
extra!=null){
flag |= 4; // FEXTRA
}
if(
name!=null){
flag |= 8; // FNAME
}
if(
comment!=null){
flag |= 16; // FCOMMENT
}
int
xfl = 0;
if(
d.
level ==
JZlib.
Z_BEST_SPEED){
xfl |= 4;
}
else if (
d.
level ==
JZlib.
Z_BEST_COMPRESSION){
xfl |= 2;
}
d.
put_short((short)0x8b1f); // ID1 ID2
d.
put_byte((byte)8); // CM(Compression Method)
d.
put_byte((byte)
flag);
d.
put_byte((byte)
mtime);
d.
put_byte((byte)(
mtime>>8));
d.
put_byte((byte)(
mtime>>16));
d.
put_byte((byte)(
mtime>>24));
d.
put_byte((byte)
xfl);
d.
put_byte((byte)
os);
if(
extra!=null){
d.
put_byte((byte)
extra.length);
d.
put_byte((byte)(
extra.length>>8));
d.
put_byte(
extra, 0,
extra.length);
}
if(
name!=null){
d.
put_byte(
name, 0,
name.length);
d.
put_byte((byte)0);
}
if(
comment!=null){
d.
put_byte(
comment, 0,
comment.length);
d.
put_byte((byte)0);
}
}
@
Override
public
Object clone() throws
CloneNotSupportedException {
GZIPHeader gheader = (
GZIPHeader)super.clone();
byte[]
tmp;
if(
gheader.
extra!=null){
tmp=new byte[
gheader.
extra.length];
System.
arraycopy(
gheader.
extra, 0,
tmp, 0,
tmp.length);
gheader.
extra =
tmp;
}
if(
gheader.
name!=null){
tmp=new byte[
gheader.
name.length];
System.
arraycopy(
gheader.
name, 0,
tmp, 0,
tmp.length);
gheader.
name =
tmp;
}
if(
gheader.
comment!=null){
tmp=new byte[
gheader.
comment.length];
System.
arraycopy(
gheader.
comment, 0,
tmp, 0,
tmp.length);
gheader.
comment =
tmp;
}
return
gheader;
}
}