org.glowroot.shaded.jcraft.jzlib.Inflate Maven / Gradle / Ivy
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/* -*-mode:java; c-basic-offset:2; -*- */
/*
Copyright (c) 2000-2011 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([email protected]) and Mark Adler([email protected])
* and contributors of zlib.
*/
package org.glowroot.shaded.jcraft.jzlib;
final class Inflate{
static final private int MAX_WBITS=15; // 32K LZ77 window
// preset dictionary flag in zlib header
static final private int PRESET_DICT=0x20;
static final int Z_NO_FLUSH=0;
static final int Z_PARTIAL_FLUSH=1;
static final int Z_SYNC_FLUSH=2;
static final int Z_FULL_FLUSH=3;
static final int Z_FINISH=4;
static final private int Z_DEFLATED=8;
static final private int Z_OK=0;
static final private int Z_STREAM_END=1;
static final private int Z_NEED_DICT=2;
static final private int Z_ERRNO=-1;
static final private int Z_STREAM_ERROR=-2;
static final private int Z_DATA_ERROR=-3;
static final private int Z_MEM_ERROR=-4;
static final private int Z_BUF_ERROR=-5;
static final private int Z_VERSION_ERROR=-6;
static final private int METHOD=0; // waiting for method byte
static final private int FLAG=1; // waiting for flag byte
static final private int DICT4=2; // four dictionary check bytes to go
static final private int DICT3=3; // three dictionary check bytes to go
static final private int DICT2=4; // two dictionary check bytes to go
static final private int DICT1=5; // one dictionary check byte to go
static final private int DICT0=6; // waiting for inflateSetDictionary
static final private int BLOCKS=7; // decompressing blocks
static final private int CHECK4=8; // four check bytes to go
static final private int CHECK3=9; // three check bytes to go
static final private int CHECK2=10; // two check bytes to go
static final private int CHECK1=11; // one check byte to go
static final private int DONE=12; // finished check, done
static final private int BAD=13; // got an error--stay here
static final private int HEAD=14;
static final private int LENGTH=15;
static final private int TIME=16;
static final private int OS=17;
static final private int EXLEN=18;
static final private int EXTRA=19;
static final private int NAME=20;
static final private int COMMENT=21;
static final private int HCRC=22;
static final private int FLAGS=23;
static final int INFLATE_ANY=0x40000000;
int mode; // current inflate mode
// mode dependent information
int method; // if FLAGS, method byte
// if CHECK, check values to compare
long was = -1; // computed check value
long need; // stream check value
// if BAD, inflateSync's marker bytes count
int marker;
// mode independent information
int wrap; // flag for no wrapper
// 0: no wrapper
// 1: zlib header
// 2: gzip header
// 4: auto detection
int wbits; // log2(window size) (8..15, defaults to 15)
InfBlocks blocks; // current inflate_blocks state
private final ZStream z;
private int flags;
private int need_bytes = -1;
private byte[] crcbuf=new byte[4];
GZIPHeader gheader = null;
int inflateReset(){
if(z == null) return Z_STREAM_ERROR;
z.total_in = z.total_out = 0;
z.msg = null;
this.mode = HEAD;
this.need_bytes = -1;
this.blocks.reset();
return Z_OK;
}
int inflateEnd(){
if(blocks != null){
blocks.free();
}
return Z_OK;
}
Inflate(ZStream z){
this.z=z;
}
int inflateInit(int w){
z.msg = null;
blocks = null;
// handle undocumented wrap option (no zlib header or check)
wrap = 0;
if(w < 0){
w = - w;
}
else if((w&INFLATE_ANY) != 0){
wrap = 4;
w &= ~INFLATE_ANY;
if(w < 48)
w &= 15;
}
else if((w & ~31) != 0) { // for example, DEF_WBITS + 32
wrap = 4; // zlib and gzip wrapped data should be accepted.
w &= 15;
}
else {
wrap = (w >> 4) + 1;
if(w < 48)
w &= 15;
}
if(w<8 ||w>15){
inflateEnd();
return Z_STREAM_ERROR;
}
if(blocks != null && wbits != w){
blocks.free();
blocks=null;
}
// set window size
wbits=w;
this.blocks=new InfBlocks(z, 1<>8))&0xff;
if(((wrap&1)==0 || // check if zlib header allowed
(((this.method << 8)+b) % 31)!=0) &&
(this.method&0xf)!=Z_DEFLATED){
if(wrap == 4){
z.next_in_index -= 2;
z.avail_in += 2;
z.total_in -= 2;
wrap = 0;
this.mode = BLOCKS;
break;
}
this.mode = BAD;
z.msg = "incorrect header check";
// since zlib 1.2, it is allowted to inflateSync for this case.
/*
this.marker = 5; // can't try inflateSync
*/
break;
}
if((this.method&0xf)!=Z_DEFLATED){
this.mode = BAD;
z.msg="unknown compression method";
// since zlib 1.2, it is allowted to inflateSync for this case.
/*
this.marker = 5; // can't try inflateSync
*/
break;
}
if(wrap == 4){
wrap = 1;
}
if((this.method>>4)+8>this.wbits){
this.mode = BAD;
z.msg="invalid window size";
// since zlib 1.2, it is allowted to inflateSync for this case.
/*
this.marker = 5; // can't try inflateSync
*/
break;
}
z.adler=new Adler32();
if((b&PRESET_DICT)==0){
this.mode = BLOCKS;
break;
}
this.mode = DICT4;
case DICT4:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need=((z.next_in[z.next_in_index++]&0xff)<<24)&0xff000000L;
this.mode=DICT3;
case DICT3:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need+=((z.next_in[z.next_in_index++]&0xff)<<16)&0xff0000L;
this.mode=DICT2;
case DICT2:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need+=((z.next_in[z.next_in_index++]&0xff)<<8)&0xff00L;
this.mode=DICT1;
case DICT1:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need += (z.next_in[z.next_in_index++]&0xffL);
z.adler.reset(this.need);
this.mode = DICT0;
return Z_NEED_DICT;
case DICT0:
this.mode = BAD;
z.msg = "need dictionary";
this.marker = 0; // can try inflateSync
return Z_STREAM_ERROR;
case BLOCKS:
r = this.blocks.proc(r);
if(r == Z_DATA_ERROR){
this.mode = BAD;
this.marker = 0; // can try inflateSync
break;
}
if(r == Z_OK){
r = f;
}
if(r != Z_STREAM_END){
return r;
}
r = f;
this.was=z.adler.getValue();
this.blocks.reset();
if(this.wrap==0){
this.mode=DONE;
break;
}
this.mode=CHECK4;
case CHECK4:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need=((z.next_in[z.next_in_index++]&0xff)<<24)&0xff000000L;
this.mode=CHECK3;
case CHECK3:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need+=((z.next_in[z.next_in_index++]&0xff)<<16)&0xff0000L;
this.mode = CHECK2;
case CHECK2:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need+=((z.next_in[z.next_in_index++]&0xff)<<8)&0xff00L;
this.mode = CHECK1;
case CHECK1:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
this.need+=(z.next_in[z.next_in_index++]&0xffL);
if(flags!=0){ // gzip
this.need = ((this.need&0xff000000)>>24 |
(this.need&0x00ff0000)>>8 |
(this.need&0x0000ff00)<<8 |
(this.need&0x0000ffff)<<24)&0xffffffffL;
}
if(((int)(this.was)) != ((int)(this.need))){
z.msg = "incorrect data check";
// chack is delayed
/*
this.mode = BAD;
this.marker = 5; // can't try inflateSync
break;
*/
}
else if(flags!=0 && gheader!=null){
gheader.crc = this.need;
}
this.mode = LENGTH;
case LENGTH:
if (wrap!=0 && flags!=0) {
try { r=readBytes(4, r, f); }
catch(Return e){ return e.r; }
if(z.msg!=null && z.msg.equals("incorrect data check")){
this.mode = BAD;
this.marker = 5; // can't try inflateSync
break;
}
if (this.need != (z.total_out & 0xffffffffL)) {
z.msg = "incorrect length check";
this.mode = BAD;
break;
}
z.msg = null;
}
else {
if(z.msg!=null && z.msg.equals("incorrect data check")){
this.mode = BAD;
this.marker = 5; // can't try inflateSync
break;
}
}
this.mode = DONE;
case DONE:
return Z_STREAM_END;
case BAD:
return Z_DATA_ERROR;
case FLAGS:
try { r=readBytes(2, r, f); }
catch(Return e){ return e.r; }
flags = ((int)this.need)&0xffff;
if ((flags & 0xff) != Z_DEFLATED) {
z.msg = "unknown compression method";
this.mode = BAD;
break;
}
if ((flags & 0xe000)!=0) {
z.msg = "unknown header flags set";
this.mode = BAD;
break;
}
if ((flags & 0x0200)!=0){
checksum(2, this.need);
}
this.mode = TIME;
case TIME:
try { r=readBytes(4, r, f); }
catch(Return e){ return e.r; }
if(gheader!=null)
gheader.time = this.need;
if ((flags & 0x0200)!=0){
checksum(4, this.need);
}
this.mode = OS;
case OS:
try { r=readBytes(2, r, f); }
catch(Return e){ return e.r; }
if(gheader!=null){
gheader.xflags = ((int)this.need)&0xff;
gheader.os = (((int)this.need)>>8)&0xff;
}
if ((flags & 0x0200)!=0){
checksum(2, this.need);
}
this.mode = EXLEN;
case EXLEN:
if ((flags & 0x0400)!=0) {
try { r=readBytes(2, r, f); }
catch(Return e){ return e.r; }
if(gheader!=null){
gheader.extra = new byte[((int)this.need)&0xffff];
}
if ((flags & 0x0200)!=0){
checksum(2, this.need);
}
}
else if(gheader!=null){
gheader.extra=null;
}
this.mode = EXTRA;
case EXTRA:
if ((flags & 0x0400)!=0) {
try {
r=readBytes(r, f);
if(gheader!=null){
byte[] foo = tmp_string.toByteArray();
tmp_string=null;
if(foo.length == gheader.extra.length){
System.arraycopy(foo, 0, gheader.extra, 0, foo.length);
}
else{
z.msg = "bad extra field length";
this.mode = BAD;
break;
}
}
}
catch(Return e){ return e.r; }
}
else if(gheader!=null){
gheader.extra=null;
}
this.mode = NAME;
case NAME:
if ((flags & 0x0800)!=0) {
try {
r=readString(r, f);
if(gheader!=null){
gheader.name=tmp_string.toByteArray();
}
tmp_string=null;
}
catch(Return e){ return e.r; }
}
else if(gheader!=null){
gheader.name=null;
}
this.mode = COMMENT;
case COMMENT:
if ((flags & 0x1000)!=0) {
try {
r=readString(r, f);
if(gheader!=null){
gheader.comment=tmp_string.toByteArray();
}
tmp_string=null;
}
catch(Return e){ return e.r; }
}
else if(gheader!=null){
gheader.comment=null;
}
this.mode = HCRC;
case HCRC:
if ((flags & 0x0200)!=0) {
try { r=readBytes(2, r, f); }
catch(Return e){ return e.r; }
if(gheader!=null){
gheader.hcrc=(int)(this.need&0xffff);
}
if(this.need != (z.adler.getValue()&0xffffL)){
this.mode = BAD;
z.msg = "header crc mismatch";
this.marker = 5; // can't try inflateSync
break;
}
}
z.adler = new CRC32();
this.mode = BLOCKS;
break;
default:
return Z_STREAM_ERROR;
}
}
}
int inflateSetDictionary(byte[] dictionary, int dictLength){
if(z==null || (this.mode != DICT0 && this.wrap != 0)){
return Z_STREAM_ERROR;
}
int index=0;
int length = dictLength;
if(this.mode==DICT0){
long adler_need=z.adler.getValue();
z.adler.reset();
z.adler.update(dictionary, 0, dictLength);
if(z.adler.getValue()!=adler_need){
return Z_DATA_ERROR;
}
}
z.adler.reset();
if(length >= (1<0){
if(z.avail_in==0){ throw new Return(r); }; r=f;
z.avail_in--; z.total_in++;
this.need = this.need |
((z.next_in[z.next_in_index++]&0xff)<<((n-need_bytes)*8));
need_bytes--;
}
if(n==2){
this.need&=0xffffL;
}
else if(n==4) {
this.need&=0xffffffffL;
}
need_bytes=-1;
return r;
}
class Return extends Exception{
int r;
Return(int r){this.r=r; }
}
private java.io.ByteArrayOutputStream tmp_string = null;
private int readString(int r, int f) throws Return{
if(tmp_string == null){
tmp_string=new java.io.ByteArrayOutputStream();
}
int b=0;
do {
if(z.avail_in==0){ throw new Return(r); }; r=f;
z.avail_in--; z.total_in++;
b = z.next_in[z.next_in_index];
if(b!=0) tmp_string.write(z.next_in, z.next_in_index, 1);
z.adler.update(z.next_in, z.next_in_index, 1);
z.next_in_index++;
}while(b!=0);
return r;
}
private int readBytes(int r, int f) throws Return{
if(tmp_string == null){
tmp_string=new java.io.ByteArrayOutputStream();
}
int b=0;
while(this.need>0){
if(z.avail_in==0){ throw new Return(r); }; r=f;
z.avail_in--; z.total_in++;
b = z.next_in[z.next_in_index];
tmp_string.write(z.next_in, z.next_in_index, 1);
z.adler.update(z.next_in, z.next_in_index, 1);
z.next_in_index++;
this.need--;
}
return r;
}
private void checksum(int n, long v){
for(int i=0; i>=8;
}
z.adler.update(crcbuf, 0, n);
}
public GZIPHeader getGZIPHeader(){
return gheader;
}
boolean inParsingHeader(){
switch(mode){
case HEAD:
case DICT4:
case DICT3:
case DICT2:
case DICT1:
case FLAGS:
case TIME:
case OS:
case EXLEN:
case EXTRA:
case NAME:
case COMMENT:
case HCRC:
return true;
default:
return false;
}
}
}