line source
+ − /* -*-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;
+ −
+ − final class InfBlocks{
+ − static final private int MANY=1440;
+ −
+ − // And'ing with mask[n] masks the lower n bits
+ − static final private int[] inflate_mask = {
+ − 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f,
+ − 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff,
+ − 0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff,
+ − 0x00007fff, 0x0000ffff
+ − };
+ −
+ − // Table for deflate from PKZIP's appnote.txt.
+ − static final int[] border = { // Order of the bit length code lengths
+ − 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
+ − };
+ −
+ − 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 TYPE=0; // get type bits (3, including end bit)
+ − static final private int LENS=1; // get lengths for stored
+ − static final private int STORED=2;// processing stored block
+ − static final private int TABLE=3; // get table lengths
+ − static final private int BTREE=4; // get bit lengths tree for a dynamic block
+ − static final private int DTREE=5; // get length, distance trees for a dynamic block
+ − static final private int CODES=6; // processing fixed or dynamic block
+ − static final private int DRY=7; // output remaining window bytes
+ − static final private int DONE=8; // finished last block, done
+ − static final private int BAD=9; // ot a data error--stuck here
+ −
+ − int mode; // current inflate_block mode
+ −
+ − int left; // if STORED, bytes left to copy
+ −
+ − int table; // table lengths (14 bits)
+ − int index; // index into blens (or border)
+ − int[] blens; // bit lengths of codes
+ − int[] bb=new int[1]; // bit length tree depth
+ − int[] tb=new int[1]; // bit length decoding tree
+ −
+ − int[] bl=new int[1];
+ − int[] bd=new int[1];
+ −
+ − int[][] tl=new int[1][];
+ − int[][] td=new int[1][];
+ − int[] tli=new int[1]; // tl_index
+ − int[] tdi=new int[1]; // td_index
+ −
+ − private final InfCodes codes; // if CODES, current state
+ −
+ − int last; // true if this block is the last block
+ −
+ − // mode independent information
+ − int bitk; // bits in bit buffer
+ − int bitb; // bit buffer
+ − int[] hufts; // single malloc for tree space
+ − byte[] window; // sliding window
+ − int end; // one byte after sliding window
+ − int read; // window read pointer
+ − int write; // window write pointer
+ − private boolean check;
+ −
+ − private final InfTree inftree=new InfTree();
+ −
+ − private final ZStream z;
+ −
+ − InfBlocks(ZStream z, int w){
+ − this.z=z;
+ − this.codes=new InfCodes(this.z, this);
+ − hufts=new int[MANY*3];
+ − window=new byte[w];
+ − end=w;
+ − this.check = (z.istate.wrap==0) ? false : true;
+ − mode = TYPE;
+ − reset();
+ − }
+ −
+ − void reset(){
+ − if(mode==BTREE || mode==DTREE){
+ − }
+ − if(mode==CODES){
+ − codes.free(z);
+ − }
+ − mode=TYPE;
+ − bitk=0;
+ − bitb=0;
+ − read=write=0;
+ − if(check){
+ − z.adler.reset();
+ − }
+ − }
+ −
+ − int proc(int r){
+ − int t; // temporary storage
+ − int b; // bit buffer
+ − int k; // bits in bit buffer
+ − int p; // input data pointer
+ − int n; // bytes available there
+ − int q; // output window write pointer
+ − int m; // bytes to end of window or read pointer
+ −
+ − // copy input/output information to locals (UPDATE macro restores)
+ − {p=z.next_in_index;n=z.avail_in;b=bitb;k=bitk;}
+ − {q=write;m=(int)(q<read?read-q-1:end-q);}
+ −
+ − // process input based on current state
+ − while(true){
+ − switch (mode){
+ − case TYPE:
+ −
+ − while(k<(3)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ − t = (int)(b & 7);
+ − last = t & 1;
+ −
+ − switch (t >>> 1){
+ − case 0: // stored
+ − {b>>>=(3);k-=(3);}
+ − t = k & 7; // go to byte boundary
+ −
+ − {b>>>=(t);k-=(t);}
+ − mode = LENS; // get length of stored block
+ − break;
+ − case 1: // fixed
+ − InfTree.inflate_trees_fixed(bl, bd, tl, td, z);
+ − codes.init(bl[0], bd[0], tl[0], 0, td[0], 0);
+ −
+ − {b>>>=(3);k-=(3);}
+ −
+ − mode = CODES;
+ − break;
+ − case 2: // dynamic
+ −
+ − {b>>>=(3);k-=(3);}
+ −
+ − mode = TABLE;
+ − break;
+ − case 3: // illegal
+ −
+ − {b>>>=(3);k-=(3);}
+ − mode = BAD;
+ − z.msg = "invalid block type";
+ − r = Z_DATA_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − break;
+ − case LENS:
+ −
+ − while(k<(32)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ −
+ − if ((((~b) >>> 16) & 0xffff) != (b & 0xffff)){
+ − mode = BAD;
+ − z.msg = "invalid stored block lengths";
+ − r = Z_DATA_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − left = (b & 0xffff);
+ − b = k = 0; // dump bits
+ − mode = left!=0 ? STORED : (last!=0 ? DRY : TYPE);
+ − break;
+ − case STORED:
+ − if (n == 0){
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ −
+ − if(m==0){
+ − if(q==end&&read!=0){
+ − q=0; m=(int)(q<read?read-q-1:end-q);
+ − }
+ − if(m==0){
+ − write=q;
+ − r=inflate_flush(r);
+ − q=write;m=(int)(q<read?read-q-1:end-q);
+ − if(q==end&&read!=0){
+ − q=0; m=(int)(q<read?read-q-1:end-q);
+ − }
+ − if(m==0){
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − }
+ − }
+ − r=Z_OK;
+ −
+ − t = left;
+ − if(t>n) t = n;
+ − if(t>m) t = m;
+ − System.arraycopy(z.next_in, p, window, q, t);
+ − p += t; n -= t;
+ − q += t; m -= t;
+ − if ((left -= t) != 0)
+ − break;
+ − mode = last!=0 ? DRY : TYPE;
+ − break;
+ − case TABLE:
+ −
+ − while(k<(14)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ −
+ − table = t = (b & 0x3fff);
+ − if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
+ − {
+ − mode = BAD;
+ − z.msg = "too many length or distance symbols";
+ − r = Z_DATA_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
+ − if(blens==null || blens.length<t){
+ − blens=new int[t];
+ − }
+ − else{
+ − for(int i=0; i<t; i++){blens[i]=0;}
+ − }
+ −
+ − {b>>>=(14);k-=(14);}
+ −
+ − index = 0;
+ − mode = BTREE;
+ − case BTREE:
+ − while (index < 4 + (table >>> 10)){
+ − while(k<(3)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ −
+ − blens[border[index++]] = b&7;
+ −
+ − {b>>>=(3);k-=(3);}
+ − }
+ −
+ − while(index < 19){
+ − blens[border[index++]] = 0;
+ − }
+ −
+ − bb[0] = 7;
+ − t = inftree.inflate_trees_bits(blens, bb, tb, hufts, z);
+ − if (t != Z_OK){
+ − r = t;
+ − if (r == Z_DATA_ERROR){
+ − blens=null;
+ − mode = BAD;
+ − }
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ −
+ − index = 0;
+ − mode = DTREE;
+ − case DTREE:
+ − while (true){
+ − t = table;
+ − if(!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))){
+ − break;
+ − }
+ −
+ − int[] h;
+ − int i, j, c;
+ −
+ − t = bb[0];
+ −
+ − while(k<(t)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ −
+ − if(tb[0]==-1){
+ − //System.err.println("null...");
+ − }
+ −
+ − t=hufts[(tb[0]+(b&inflate_mask[t]))*3+1];
+ − c=hufts[(tb[0]+(b&inflate_mask[t]))*3+2];
+ −
+ − if (c < 16){
+ − b>>>=(t);k-=(t);
+ − blens[index++] = c;
+ − }
+ − else { // c == 16..18
+ − i = c == 18 ? 7 : c - 14;
+ − j = c == 18 ? 11 : 3;
+ −
+ − while(k<(t+i)){
+ − if(n!=0){
+ − r=Z_OK;
+ − }
+ − else{
+ − bitb=b; bitk=k;
+ − z.avail_in=n;
+ − z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − };
+ − n--;
+ − b|=(z.next_in[p++]&0xff)<<k;
+ − k+=8;
+ − }
+ −
+ − b>>>=(t);k-=(t);
+ −
+ − j += (b & inflate_mask[i]);
+ −
+ − b>>>=(i);k-=(i);
+ −
+ − i = index;
+ − t = table;
+ − if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
+ − (c == 16 && i < 1)){
+ − blens=null;
+ − mode = BAD;
+ − z.msg = "invalid bit length repeat";
+ − r = Z_DATA_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ −
+ − c = c == 16 ? blens[i-1] : 0;
+ − do{
+ − blens[i++] = c;
+ − }
+ − while (--j!=0);
+ − index = i;
+ − }
+ − }
+ −
+ − tb[0]=-1;
+ − {
+ − bl[0] = 9; // must be <= 9 for lookahead assumptions
+ − bd[0] = 6; // must be <= 9 for lookahead assumptions
+ − t = table;
+ − t = inftree.inflate_trees_dynamic(257 + (t & 0x1f),
+ − 1 + ((t >> 5) & 0x1f),
+ − blens, bl, bd, tli, tdi, hufts, z);
+ −
+ − if (t != Z_OK){
+ − if (t == Z_DATA_ERROR){
+ − blens=null;
+ − mode = BAD;
+ − }
+ − r = t;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − codes.init(bl[0], bd[0], hufts, tli[0], hufts, tdi[0]);
+ − }
+ − mode = CODES;
+ − case CODES:
+ − bitb=b; bitk=k;
+ − z.avail_in=n; z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ −
+ − if ((r = codes.proc(r)) != Z_STREAM_END){
+ − return inflate_flush(r);
+ − }
+ − r = Z_OK;
+ − codes.free(z);
+ −
+ − p=z.next_in_index; n=z.avail_in;b=bitb;k=bitk;
+ − q=write;m=(int)(q<read?read-q-1:end-q);
+ −
+ − if (last==0){
+ − mode = TYPE;
+ − break;
+ − }
+ − mode = DRY;
+ − case DRY:
+ − write=q;
+ − r=inflate_flush(r);
+ − q=write; m=(int)(q<read?read-q-1:end-q);
+ − if (read != write){
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − mode = DONE;
+ − case DONE:
+ − r = Z_STREAM_END;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − case BAD:
+ − r = Z_DATA_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ −
+ − default:
+ − r = Z_STREAM_ERROR;
+ −
+ − bitb=b; bitk=k;
+ − z.avail_in=n;z.total_in+=p-z.next_in_index;z.next_in_index=p;
+ − write=q;
+ − return inflate_flush(r);
+ − }
+ − }
+ − }
+ −
+ − void free(){
+ − reset();
+ − window=null;
+ − hufts=null;
+ − //ZFREE(z, s);
+ − }
+ −
+ − void set_dictionary(byte[] d, int start, int n){
+ − System.arraycopy(d, start, window, 0, n);
+ − read = write = n;
+ − }
+ −
+ − // Returns true if inflate is currently at the end of a block generated
+ − // by Z_SYNC_FLUSH or Z_FULL_FLUSH.
+ − int sync_point(){
+ − return mode == LENS ? 1 : 0;
+ − }
+ −
+ − // copy as much as possible from the sliding window to the output area
+ − int inflate_flush(int r){
+ − int n;
+ − int p;
+ − int q;
+ −
+ − // local copies of source and destination pointers
+ − p = z.next_out_index;
+ − q = read;
+ −
+ − // compute number of bytes to copy as far as end of window
+ − n = (int)((q <= write ? write : end) - q);
+ − if(n > z.avail_out) n = z.avail_out;
+ − if(n!=0 && r == Z_BUF_ERROR) r = Z_OK;
+ −
+ − // update counters
+ − z.avail_out -= n;
+ − z.total_out += n;
+ −
+ − // update check information
+ − if(check && n>0){
+ − z.adler.update(window, q, n);
+ − }
+ −
+ − // copy as far as end of window
+ − System.arraycopy(window, q, z.next_out, p, n);
+ − p += n;
+ − q += n;
+ −
+ − // see if more to copy at beginning of window
+ − if (q == end){
+ − // wrap pointers
+ − q = 0;
+ − if (write == end)
+ − write = 0;
+ −
+ − // compute bytes to copy
+ − n = write - q;
+ − if (n > z.avail_out) n = z.avail_out;
+ − if (n!=0 && r == Z_BUF_ERROR) r = Z_OK;
+ −
+ − // update counters
+ − z.avail_out -= n;
+ − z.total_out += n;
+ −
+ − // update check information
+ − if(check && n>0){
+ − z.adler.update(window, q, n);
+ − }
+ −
+ − // copy
+ − System.arraycopy(window, q, z.next_out, p, n);
+ − p += n;
+ − q += n;
+ − }
+ −
+ − // update pointers
+ − z.next_out_index = p;
+ − read = q;
+ −
+ − // done
+ − return r;
+ − }
+ − }