using System; /* * $Id: InfBlocks.cs,v 1.2 2008-05-10 09:35:40 bouncy Exp $ * 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(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu) * and contributors of zlib. */ namespace Org.BouncyCastle.Utilities.Zlib { internal sealed class InfBlocks{ private const int MANY=1440; // And'ing with mask[n] masks the lower n bits private static readonly 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 readonly 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 }; private const int Z_OK=0; private const int Z_STREAM_END=1; private const int Z_NEED_DICT=2; private const int Z_ERRNO=-1; private const int Z_STREAM_ERROR=-2; private const int Z_DATA_ERROR=-3; private const int Z_MEM_ERROR=-4; private const int Z_BUF_ERROR=-5; private const int Z_VERSION_ERROR=-6; private const int TYPE=0; // get type bits (3, including end bit) private const int LENS=1; // get lengths for stored private const int STORED=2;// processing stored block private const int TABLE=3; // get table lengths private const int BTREE=4; // get bit lengths tree for a dynamic block private const int DTREE=5; // get length, distance trees for a dynamic block private const int CODES=6; // processing fixed or dynamic block private const int DRY=7; // output remaining window bytes private const int DONE=8; // finished last block, done private const int BAD=9; // ot a data error--stuck here internal int mode; // current inflate_block mode internal int left; // if STORED, bytes left to copy internal int table; // table lengths (14 bits) internal int index; // index into blens (or border) internal int[] blens; // bit lengths of codes internal int[] bb=new int[1]; // bit length tree depth internal int[] tb=new int[1]; // bit length decoding tree internal InfCodes codes=new InfCodes(); // if CODES, current state int last; // true if this block is the last block // mode independent information internal int bitk; // bits in bit buffer internal int bitb; // bit buffer internal int[] hufts; // single malloc for tree space internal byte[] window; // sliding window internal int end; // one byte after sliding window internal int read; // window read pointer internal int write; // window write pointer internal Object checkfn; // check function internal long check; // check on output internal InfTree inftree=new InfTree(); internal InfBlocks(ZStream z, Object checkfn, int w){ hufts=new int[MANY*3]; window=new byte[w]; end=w; this.checkfn = checkfn; mode = TYPE; reset(z, null); } internal void reset(ZStream z, long[] c){ if(c!=null) c[0]=check; if(mode==BTREE || mode==DTREE){ } if(mode==CODES){ codes.free(z); } mode=TYPE; bitk=0; bitb=0; read=write=0; if(checkfn != null) z.adler=check=z._adler.adler32(0L, null, 0, 0); } internal int proc(ZStream z, 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> 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 int[] bl=new int[1]; int[] bd=new int[1]; int[][] tl=new int[1][]; int[][] td=new int[1][]; InfTree.inflate_trees_fixed(bl, bd, tl, td, z); codes.init(bl[0], bd[0], tl[0], 0, td[0], 0, z); } { 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(z,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(z,r); }; n--; b|=(z.next_in[p++]&0xff)<> 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(z,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(z,r); } if(m==0){ if(q==end&&read!=0){ q=0; m=(int)(qn) t = n; if(t>m) t = m; System.Array.Copy(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(z,r); }; n--; b|=(z.next_in[p++]&0xff)< 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(z,r); } t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f); if(blens==null || blens.Length>=(14);k-=(14);} index = 0; mode = BTREE; goto case 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(z,r); }; n--; b|=(z.next_in[p++]&0xff)<>=(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(z,r); } index = 0; mode = DTREE; goto case DTREE; case DTREE: while (true){ t = table; if(!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))){ break; } 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(z,r); }; n--; b|=(z.next_in[p++]&0xff)<>=(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(z,r); }; n--; b|=(z.next_in[p++]&0xff)<>=(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(z,r); } c = c == 16 ? blens[i-1] : 0; do{ blens[i++] = c; } while (--j!=0); index = i; } } tb[0]=-1; { int[] bl=new int[1]; int[] bd=new int[1]; int[] tl=new int[1]; int[] td=new int[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, tl, td, 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(z,r); } codes.init(bl[0], bd[0], hufts, tl[0], hufts, td[0], z); } mode = CODES; goto case 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(this, z, r)) != Z_STREAM_END){ return inflate_flush(z, 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 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(checkfn != null) z.adler=check=z._adler.adler32(check, window, q, n); // copy as far as end of window System.Array.Copy(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(checkfn != null) z.adler=check=z._adler.adler32(check, window, q, n); // copy System.Array.Copy(window, q, z.next_out, p, n); p += n; q += n; } // update pointers z.next_out_index = p; read = q; // done return r; } } }