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/* -*-mode:java; c-basic-offset:2; -*- */
/*
Copyright (c) 2000,2001,2002,2003 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 com.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
int mode; // current inflate mode
// mode dependent information
int method; // if FLAGS, method byte
// if CHECK, check values to compare
long[] was=new long[1] ; // computed check value
long need; // stream check value
// if BAD, inflateSync's marker bytes count
int marker;
// mode independent information
int nowrap; // flag for no wrapper
int wbits; // log2(window size) (8..15, defaults to 15)
InfBlocks blocks; // current inflate_blocks state
int inflateReset(ZStream z){
if(z == null || z.istate == null) return Z_STREAM_ERROR;
z.total_in = z.total_out = 0;
z.msg = null;
z.istate.mode = z.istate.nowrap!=0 ? BLOCKS : METHOD;
z.istate.blocks.reset(z, null);
return Z_OK;
}
int inflateEnd(ZStream z){
if(blocks != null)
blocks.free(z);
blocks=null;
// ZFREE(z, z->state);
return Z_OK;
}
int inflateInit(ZStream z, int w){
z.msg = null;
blocks = null;
// handle undocumented nowrap option (no zlib header or check)
nowrap = 0;
if(w < 0){
w = - w;
nowrap = 1;
}
// set window size
if(w<8 ||w>15){
inflateEnd(z);
return Z_STREAM_ERROR;
}
wbits=w;
z.istate.blocks=new InfBlocks(z,
z.istate.nowrap!=0 ? null : this,
1<>4)+8>z.istate.wbits){
z.istate.mode = BAD;
z.msg="invalid window size";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode=FLAG;
case FLAG:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
b = (z.next_in[z.next_in_index++])&0xff;
if((((z.istate.method << 8)+b) % 31)!=0){
z.istate.mode = BAD;
z.msg = "incorrect header check";
z.istate.marker = 5; // can't try inflateSync
break;
}
if((b&PRESET_DICT)==0){
z.istate.mode = BLOCKS;
break;
}
z.istate.mode = DICT4;
case DICT4:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need=((z.next_in[z.next_in_index++]&0xff)<<24)&0xff000000L;
z.istate.mode=DICT3;
case DICT3:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need+=((z.next_in[z.next_in_index++]&0xff)<<16)&0xff0000L;
z.istate.mode=DICT2;
case DICT2:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need+=((z.next_in[z.next_in_index++]&0xff)<<8)&0xff00L;
z.istate.mode=DICT1;
case DICT1:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need += (z.next_in[z.next_in_index++]&0xffL);
z.adler = z.istate.need;
z.istate.mode = DICT0;
return Z_NEED_DICT;
case DICT0:
z.istate.mode = BAD;
z.msg = "need dictionary";
z.istate.marker = 0; // can try inflateSync
return Z_STREAM_ERROR;
case BLOCKS:
r = z.istate.blocks.proc(z, r);
if(r == Z_DATA_ERROR){
z.istate.mode = BAD;
z.istate.marker = 0; // can try inflateSync
break;
}
if(r == Z_OK){
r = f;
}
if(r != Z_STREAM_END){
return r;
}
r = f;
z.istate.blocks.reset(z, z.istate.was);
if(z.istate.nowrap!=0){
z.istate.mode=DONE;
break;
}
z.istate.mode=CHECK4;
case CHECK4:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need=((z.next_in[z.next_in_index++]&0xff)<<24)&0xff000000L;
z.istate.mode=CHECK3;
case CHECK3:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need+=((z.next_in[z.next_in_index++]&0xff)<<16)&0xff0000L;
z.istate.mode = CHECK2;
case CHECK2:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need+=((z.next_in[z.next_in_index++]&0xff)<<8)&0xff00L;
z.istate.mode = CHECK1;
case CHECK1:
if(z.avail_in==0)return r;r=f;
z.avail_in--; z.total_in++;
z.istate.need+=(z.next_in[z.next_in_index++]&0xffL);
if(((int)(z.istate.was[0])) != ((int)(z.istate.need))){
z.istate.mode = BAD;
z.msg = "incorrect data check";
z.istate.marker = 5; // can't try inflateSync
break;
}
z.istate.mode = DONE;
case DONE:
return Z_STREAM_END;
case BAD:
return Z_DATA_ERROR;
default:
return Z_STREAM_ERROR;
}
}
}
int inflateSetDictionary(ZStream z, byte[] dictionary, int dictLength){
int index=0;
int length = dictLength;
if(z==null || z.istate == null|| z.istate.mode != DICT0)
return Z_STREAM_ERROR;
if(z._adler.adler32(1L, dictionary, 0, dictLength)!=z.adler){
return Z_DATA_ERROR;
}
z.adler = z._adler.adler32(0, null, 0, 0);
if(length >= (1<
