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using System;
/*
* $Id: InfTree.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 InfTree{
private const int MANY=1440;
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 fixed_bl = 9;
private const int fixed_bd = 5;
static readonly int[] fixed_tl = {
96,7,256, 0,8,80, 0,8,16, 84,8,115,
82,7,31, 0,8,112, 0,8,48, 0,9,192,
80,7,10, 0,8,96, 0,8,32, 0,9,160,
0,8,0, 0,8,128, 0,8,64, 0,9,224,
80,7,6, 0,8,88, 0,8,24, 0,9,144,
83,7,59, 0,8,120, 0,8,56, 0,9,208,
81,7,17, 0,8,104, 0,8,40, 0,9,176,
0,8,8, 0,8,136, 0,8,72, 0,9,240,
80,7,4, 0,8,84, 0,8,20, 85,8,227,
83,7,43, 0,8,116, 0,8,52, 0,9,200,
81,7,13, 0,8,100, 0,8,36, 0,9,168,
0,8,4, 0,8,132, 0,8,68, 0,9,232,
80,7,8, 0,8,92, 0,8,28, 0,9,152,
84,7,83, 0,8,124, 0,8,60, 0,9,216,
82,7,23, 0,8,108, 0,8,44, 0,9,184,
0,8,12, 0,8,140, 0,8,76, 0,9,248,
80,7,3, 0,8,82, 0,8,18, 85,8,163,
83,7,35, 0,8,114, 0,8,50, 0,9,196,
81,7,11, 0,8,98, 0,8,34, 0,9,164,
0,8,2, 0,8,130, 0,8,66, 0,9,228,
80,7,7, 0,8,90, 0,8,26, 0,9,148,
84,7,67, 0,8,122, 0,8,58, 0,9,212,
82,7,19, 0,8,106, 0,8,42, 0,9,180,
0,8,10, 0,8,138, 0,8,74, 0,9,244,
80,7,5, 0,8,86, 0,8,22, 192,8,0,
83,7,51, 0,8,118, 0,8,54, 0,9,204,
81,7,15, 0,8,102, 0,8,38, 0,9,172,
0,8,6, 0,8,134, 0,8,70, 0,9,236,
80,7,9, 0,8,94, 0,8,30, 0,9,156,
84,7,99, 0,8,126, 0,8,62, 0,9,220,
82,7,27, 0,8,110, 0,8,46, 0,9,188,
0,8,14, 0,8,142, 0,8,78, 0,9,252,
96,7,256, 0,8,81, 0,8,17, 85,8,131,
82,7,31, 0,8,113, 0,8,49, 0,9,194,
80,7,10, 0,8,97, 0,8,33, 0,9,162,
0,8,1, 0,8,129, 0,8,65, 0,9,226,
80,7,6, 0,8,89, 0,8,25, 0,9,146,
83,7,59, 0,8,121, 0,8,57, 0,9,210,
81,7,17, 0,8,105, 0,8,41, 0,9,178,
0,8,9, 0,8,137, 0,8,73, 0,9,242,
80,7,4, 0,8,85, 0,8,21, 80,8,258,
83,7,43, 0,8,117, 0,8,53, 0,9,202,
81,7,13, 0,8,101, 0,8,37, 0,9,170,
0,8,5, 0,8,133, 0,8,69, 0,9,234,
80,7,8, 0,8,93, 0,8,29, 0,9,154,
84,7,83, 0,8,125, 0,8,61, 0,9,218,
82,7,23, 0,8,109, 0,8,45, 0,9,186,
0,8,13, 0,8,141, 0,8,77, 0,9,250,
80,7,3, 0,8,83, 0,8,19, 85,8,195,
83,7,35, 0,8,115, 0,8,51, 0,9,198,
81,7,11, 0,8,99, 0,8,35, 0,9,166,
0,8,3, 0,8,131, 0,8,67, 0,9,230,
80,7,7, 0,8,91, 0,8,27, 0,9,150,
84,7,67, 0,8,123, 0,8,59, 0,9,214,
82,7,19, 0,8,107, 0,8,43, 0,9,182,
0,8,11, 0,8,139, 0,8,75, 0,9,246,
80,7,5, 0,8,87, 0,8,23, 192,8,0,
83,7,51, 0,8,119, 0,8,55, 0,9,206,
81,7,15, 0,8,103, 0,8,39, 0,9,174,
0,8,7, 0,8,135, 0,8,71, 0,9,238,
80,7,9, 0,8,95, 0,8,31, 0,9,158,
84,7,99, 0,8,127, 0,8,63, 0,9,222,
82,7,27, 0,8,111, 0,8,47, 0,9,190,
0,8,15, 0,8,143, 0,8,79, 0,9,254,
96,7,256, 0,8,80, 0,8,16, 84,8,115,
82,7,31, 0,8,112, 0,8,48, 0,9,193,
80,7,10, 0,8,96, 0,8,32, 0,9,161,
0,8,0, 0,8,128, 0,8,64, 0,9,225,
80,7,6, 0,8,88, 0,8,24, 0,9,145,
83,7,59, 0,8,120, 0,8,56, 0,9,209,
81,7,17, 0,8,104, 0,8,40, 0,9,177,
0,8,8, 0,8,136, 0,8,72, 0,9,241,
80,7,4, 0,8,84, 0,8,20, 85,8,227,
83,7,43, 0,8,116, 0,8,52, 0,9,201,
81,7,13, 0,8,100, 0,8,36, 0,9,169,
0,8,4, 0,8,132, 0,8,68, 0,9,233,
80,7,8, 0,8,92, 0,8,28, 0,9,153,
84,7,83, 0,8,124, 0,8,60, 0,9,217,
82,7,23, 0,8,108, 0,8,44, 0,9,185,
0,8,12, 0,8,140, 0,8,76, 0,9,249,
80,7,3, 0,8,82, 0,8,18, 85,8,163,
83,7,35, 0,8,114, 0,8,50, 0,9,197,
81,7,11, 0,8,98, 0,8,34, 0,9,165,
0,8,2, 0,8,130, 0,8,66, 0,9,229,
80,7,7, 0,8,90, 0,8,26, 0,9,149,
84,7,67, 0,8,122, 0,8,58, 0,9,213,
82,7,19, 0,8,106, 0,8,42, 0,9,181,
0,8,10, 0,8,138, 0,8,74, 0,9,245,
80,7,5, 0,8,86, 0,8,22, 192,8,0,
83,7,51, 0,8,118, 0,8,54, 0,9,205,
81,7,15, 0,8,102, 0,8,38, 0,9,173,
0,8,6, 0,8,134, 0,8,70, 0,9,237,
80,7,9, 0,8,94, 0,8,30, 0,9,157,
84,7,99, 0,8,126, 0,8,62, 0,9,221,
82,7,27, 0,8,110, 0,8,46, 0,9,189,
0,8,14, 0,8,142, 0,8,78, 0,9,253,
96,7,256, 0,8,81, 0,8,17, 85,8,131,
82,7,31, 0,8,113, 0,8,49, 0,9,195,
80,7,10, 0,8,97, 0,8,33, 0,9,163,
0,8,1, 0,8,129, 0,8,65, 0,9,227,
80,7,6, 0,8,89, 0,8,25, 0,9,147,
83,7,59, 0,8,121, 0,8,57, 0,9,211,
81,7,17, 0,8,105, 0,8,41, 0,9,179,
0,8,9, 0,8,137, 0,8,73, 0,9,243,
80,7,4, 0,8,85, 0,8,21, 80,8,258,
83,7,43, 0,8,117, 0,8,53, 0,9,203,
81,7,13, 0,8,101, 0,8,37, 0,9,171,
0,8,5, 0,8,133, 0,8,69, 0,9,235,
80,7,8, 0,8,93, 0,8,29, 0,9,155,
84,7,83, 0,8,125, 0,8,61, 0,9,219,
82,7,23, 0,8,109, 0,8,45, 0,9,187,
0,8,13, 0,8,141, 0,8,77, 0,9,251,
80,7,3, 0,8,83, 0,8,19, 85,8,195,
83,7,35, 0,8,115, 0,8,51, 0,9,199,
81,7,11, 0,8,99, 0,8,35, 0,9,167,
0,8,3, 0,8,131, 0,8,67, 0,9,231,
80,7,7, 0,8,91, 0,8,27, 0,9,151,
84,7,67, 0,8,123, 0,8,59, 0,9,215,
82,7,19, 0,8,107, 0,8,43, 0,9,183,
0,8,11, 0,8,139, 0,8,75, 0,9,247,
80,7,5, 0,8,87, 0,8,23, 192,8,0,
83,7,51, 0,8,119, 0,8,55, 0,9,207,
81,7,15, 0,8,103, 0,8,39, 0,9,175,
0,8,7, 0,8,135, 0,8,71, 0,9,239,
80,7,9, 0,8,95, 0,8,31, 0,9,159,
84,7,99, 0,8,127, 0,8,63, 0,9,223,
82,7,27, 0,8,111, 0,8,47, 0,9,191,
0,8,15, 0,8,143, 0,8,79, 0,9,255
};
static readonly int[] fixed_td = {
80,5,1, 87,5,257, 83,5,17, 91,5,4097,
81,5,5, 89,5,1025, 85,5,65, 93,5,16385,
80,5,3, 88,5,513, 84,5,33, 92,5,8193,
82,5,9, 90,5,2049, 86,5,129, 192,5,24577,
80,5,2, 87,5,385, 83,5,25, 91,5,6145,
81,5,7, 89,5,1537, 85,5,97, 93,5,24577,
80,5,4, 88,5,769, 84,5,49, 92,5,12289,
82,5,13, 90,5,3073, 86,5,193, 192,5,24577
};
// Tables for deflate from PKZIP's appnote.txt.
static readonly int[] cplens = { // Copy lengths for literal codes 257..285
3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0
};
// see note #13 above about 258
static readonly int[] cplext = { // Extra bits for literal codes 257..285
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112 // 112==invalid
};
static readonly int[] cpdist = { // Copy offsets for distance codes 0..29
1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
8193, 12289, 16385, 24577
};
static readonly int[] cpdext = { // Extra bits for distance codes
0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
12, 12, 13, 13};
// If BMAX needs to be larger than 16, then h and x[] should be uLong.
const int BMAX=15; // maximum bit length of any code
int[] hn = null; // hufts used in space
int[] v = null; // work area for huft_build
int[] c = null; // bit length count table
int[] r = null; // table entry for structure assignment
int[] u = null; // table stack
int[] x = null; // bit offsets, then code stack
private int huft_build(int[] b, // code lengths in bits (all assumed <= BMAX)
int bindex,
int n, // number of codes (assumed <= 288)
int s, // number of simple-valued codes (0..s-1)
int[] d, // list of base values for non-simple codes
int[] e, // list of extra bits for non-simple codes
int[] t, // result: starting table
int[] m, // maximum lookup bits, returns actual
int[] hp,// space for trees
int[] hn,// hufts used in space
int[] v // working area: values in order of bit length
){
// Given a list of code lengths and a maximum table size, make a set of
// tables to decode that set of codes. Return Z_OK on success, Z_BUF_ERROR
// if the given code set is incomplete (the tables are still built in this
// case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
// lengths), or Z_MEM_ERROR if not enough memory.
int a; // counter for codes of length k
int f; // i repeats in table every f entries
int g; // maximum code length
int h; // table level
int i; // counter, current code
int j; // counter
int k; // number of bits in current code
int l; // bits per table (returned in m)
int mask; // (1 << w) - 1, to avoid cc -O bug on HP
int p; // pointer into c[], b[], or v[]
int q; // points to current table
int w; // bits before this table == (l * h)
int xp; // pointer into x
int y; // number of dummy codes added
int z; // number of entries in current table
// Generate counts for each bit length
p = 0; i = n;
do {
c[b[bindex+p]]++; p++; i--; // assume all entries <= BMAX
}while(i!=0);
if(c[0] == n){ // null input--all zero length codes
t[0] = -1;
m[0] = 0;
return Z_OK;
}
// Find minimum and maximum length, bound *m by those
l = m[0];
for (j = 1; j <= BMAX; j++)
if(c[j]!=0) break;
k = j; // minimum code length
if(l < j){
l = j;
}
for (i = BMAX; i!=0; i--){
if(c[i]!=0) break;
}
g = i; // maximum code length
if(l > i){
l = i;
}
m[0] = l;
// Adjust last length count to fill out codes, if needed
for (y = 1 << j; j < i; j++, y <<= 1){
if ((y -= c[j]) < 0){
return Z_DATA_ERROR;
}
}
if ((y -= c[i]) < 0){
return Z_DATA_ERROR;
}
c[i] += y;
// Generate starting offsets into the value table for each length
x[1] = j = 0;
p = 1; xp = 2;
while (--i!=0) { // note that i == g from above
x[xp] = (j += c[p]);
xp++;
p++;
}
// Make a table of values in order of bit lengths
i = 0; p = 0;
do {
if ((j = b[bindex+p]) != 0){
v[x[j]++] = i;
}
p++;
}
while (++i < n);
n = x[g]; // set n to length of v
// Generate the Huffman codes and for each, make the table entries
x[0] = i = 0; // first Huffman code is zero
p = 0; // grab values in bit order
h = -1; // no tables yet--level -1
w = -l; // bits decoded == (l * h)
u[0] = 0; // just to keep compilers happy
q = 0; // ditto
z = 0; // ditto
// go through the bit lengths (k already is bits in shortest code)
for (; k <= g; k++){
a = c[k];
while (a--!=0){
// here i is the Huffman code of length k bits for value *p
// make tables up to required level
while (k > w + l){
h++;
w += l; // previous table always l bits
// compute minimum size table less than or equal to l bits
z = g - w;
z = (z > l) ? l : z; // table size upper limit
if((f=1<<(j=k-w))>a+1){ // try a k-w bit table
// too few codes for k-w bit table
f -= a + 1; // deduct codes from patterns left
xp = k;
if(j < z){
while (++j < z){ // try smaller tables up to z bits
if((f <<= 1) <= c[++xp])
break; // enough codes to use up j bits
f -= c[xp]; // else deduct codes from patterns
}
}
}
z = 1 << j; // table entries for j-bit table
// allocate new table
if (hn[0] + z > MANY){ // (note: doesn't matter for fixed)
return Z_DATA_ERROR; // overflow of MANY
}
u[h] = q = /*hp+*/ hn[0]; // DEBUG
hn[0] += z;
// connect to last table, if there is one
if(h!=0){
x[h]=i; // save pattern for backing up
r[0]=(byte)j; // bits in this table
r[1]=(byte)l; // bits to dump before this table
j=i>>(w - l);
r[2] = (int)(q - u[h-1] - j); // offset to this table
System.Array.Copy(r, 0, hp, (u[h-1]+j)*3, 3); // connect to last table
}
else{
t[0] = q; // first table is returned result
}
}
// set up table entry in r
r[1] = (byte)(k - w);
if (p >= n){
r[0] = 128 + 64; // out of values--invalid code
}
else if (v[p] < s){
r[0] = (byte)(v[p] < 256 ? 0 : 32 + 64); // 256 is end-of-block
r[2] = v[p++]; // simple code is just the value
}
else{
r[0]=(byte)(e[v[p]-s]+16+64); // non-simple--look up in lists
r[2]=d[v[p++] - s];
}
// fill code-like entries with r
f=1<<(k-w);
for (j=i>>w;j<z;j+=f){
System.Array.Copy(r, 0, hp, (q+j)*3, 3);
}
// backwards increment the k-bit code i
for (j = 1 << (k - 1); (i & j)!=0; j >>= 1){
i ^= j;
}
i ^= j;
// backup over finished tables
mask = (1 << w) - 1; // needed on HP, cc -O bug
while ((i & mask) != x[h]){
h--; // don't need to update q
w -= l;
mask = (1 << w) - 1;
}
}
}
// Return Z_BUF_ERROR if we were given an incomplete table
return y != 0 && g != 1 ? Z_BUF_ERROR : Z_OK;
}
internal int inflate_trees_bits(int[] c, // 19 code lengths
int[] bb, // bits tree desired/actual depth
int[] tb, // bits tree result
int[] hp, // space for trees
ZStream z // for messages
){
int result;
initWorkArea(19);
hn[0]=0;
result = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
if(result == Z_DATA_ERROR){
z.msg = "oversubscribed dynamic bit lengths tree";
}
else if(result == Z_BUF_ERROR || bb[0] == 0){
z.msg = "incomplete dynamic bit lengths tree";
result = Z_DATA_ERROR;
}
return result;
}
internal int inflate_trees_dynamic(int nl, // number of literal/length codes
int nd, // number of distance codes
int[] c, // that many (total) code lengths
int[] bl, // literal desired/actual bit depth
int[] bd, // distance desired/actual bit depth
int[] tl, // literal/length tree result
int[] td, // distance tree result
int[] hp, // space for trees
ZStream z // for messages
){
int result;
// build literal/length tree
initWorkArea(288);
hn[0]=0;
result = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
if (result != Z_OK || bl[0] == 0){
if(result == Z_DATA_ERROR){
z.msg = "oversubscribed literal/length tree";
}
else if (result != Z_MEM_ERROR){
z.msg = "incomplete literal/length tree";
result = Z_DATA_ERROR;
}
return result;
}
// build distance tree
initWorkArea(288);
result = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);
if (result != Z_OK || (bd[0] == 0 && nl > 257)){
if (result == Z_DATA_ERROR){
z.msg = "oversubscribed distance tree";
}
else if (result == Z_BUF_ERROR) {
z.msg = "incomplete distance tree";
result = Z_DATA_ERROR;
}
else if (result != Z_MEM_ERROR){
z.msg = "empty distance tree with lengths";
result = Z_DATA_ERROR;
}
return result;
}
return Z_OK;
}
internal static int inflate_trees_fixed(int[] bl, //literal desired/actual bit depth
int[] bd, //distance desired/actual bit depth
int[][] tl,//literal/length tree result
int[][] td,//distance tree result
ZStream z //for memory allocation
){
bl[0]=fixed_bl;
bd[0]=fixed_bd;
tl[0]=fixed_tl;
td[0]=fixed_td;
return Z_OK;
}
private void initWorkArea(int vsize){
if(hn==null){
hn=new int[1];
v=new int[vsize];
c=new int[BMAX+1];
r=new int[3];
u=new int[BMAX];
x=new int[BMAX+1];
}
if(v.Length<vsize){ v=new int[vsize]; }
for(int i=0; i<vsize; i++){v[i]=0;}
for(int i=0; i<BMAX+1; i++){c[i]=0;}
for(int i=0; i<3; i++){r[i]=0;}
// for(int i=0; i<BMAX; i++){u[i]=0;}
System.Array.Copy(c, 0, u, 0, BMAX);
// for(int i=0; i<BMAX+1; i++){x[i]=0;}
System.Array.Copy(c, 0, x, 0, BMAX+1);
}
}
}
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