IronPython.Zlib / src / zlib.net / InfTree.cs

// Copyright (c) 2006, ComponentAce
// http://www.componentace.com
// All rights reserved.

// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

// Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 
// 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. 
// Neither the name of ComponentAce nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.

/*
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.
*/
using System;

namespace ComponentAce.Compression.Libs.ZLib
{
	/// <summary>
	/// Contains utility information for the InfTree class
	/// </summary>
    internal class InfTreeUtil
    {
        internal const int MANY = 1440;

        internal const int fixed_bl = 9;
        internal const int fixed_bd = 5;


        internal static readonly int[] fixed_tl = new int[]{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};

        internal static readonly int[] fixed_td = new int[] { 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.		
        internal static readonly int[] cplens = new int[] { 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 };

        internal static readonly int[] cplext = new int[] { 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 };

        internal static readonly int[] cpdist = new int[] { 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 };

        internal static readonly int[] cpdext = new int[] { 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.
        internal const int BMAX = 15; // maximum bit length of any code
    }

	internal sealed class InfTree
	{
		
        #region Methods

        /// <summary>
        /// Given a list of code lengths and a maximum table size, make a set of
        /// tables to decode that set of codes.  
        /// </summary>
        /// <returns>Return (int)ZLibResultCode.Z_OK on success, (int)ZLibResultCode.Z_DATA_ERROR if the given code set is incomplete (the tables are still built in this case), (int)ZLibResultCode.Z_DATA_ERROR if the input is invalid (an over-subscribed set of lengths), or (int)ZLibResultCode.Z_DATA_ERROR if not enough memory.
        /// </returns>
        private static int huft_build(int[] b, int bindex, int n, int s, int[] d, int[] e, int[] t, int[] m, int[] hp, int[] hn, int[] v)
		{
			
			int a; // counter for codes of length k
			int[] c = new int[InfTreeUtil.BMAX + 1]; // bit length count table
			int f; // i repeats in table every internalFlush 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 << windowBits) - 1, to avoid cc -O bug on HP
			int p; // pointer into c[], buffer[], or v[]
			int q; // points to current table
			int[] r = new int[3]; // table entry for structure assignment
            int[] u = new int[InfTreeUtil.BMAX]; // table stack
			int w; // bits before this table == (l * h)
            int[] x = new int[InfTreeUtil.BMAX + 1]; // bit offsets, then code stack
			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 (int)ZLibResultCode.Z_OK;
			}
			
			// Find minimum and maximum length, bound *m by those
			l = m[0];
            for (j = 1; j <= InfTreeUtil.BMAX; j++)
				if (c[j] != 0)
					break;
			k = j; // minimum code length
			if (l < j)
			{
				l = j;
			}
            for (i = InfTreeUtil.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 (int)ZLibResultCode.Z_DATA_ERROR;
				}
			}
			if ((y -= c[i]) < 0)
			{
				return (int)ZLibResultCode.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-windowBits bit table
							// too few codes for k-windowBits 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 > InfTreeUtil.MANY)
						// (note: doesn't matter for fixed)
							return (int)ZLibResultCode.Z_DATA_ERROR; // overflow of MANY
						u[h] = q = 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 = ZLibUtil.URShift(i, (w - l));
							r[2] = (int) (q - u[h - 1] - j); // offset to this table
							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 = ZLibUtil.URShift(i, w); j < z; j += f)
					{
						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 = ZLibUtil.URShift(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 (int)ZLibResultCode.Z_DATA_ERROR if we were given an incomplete table
            return y != 0 && g != 1 ? (int)ZLibResultCode.Z_BUF_ERROR : (int)ZLibResultCode.Z_OK;
		}
		
        /// <summary>
        /// Build trees
        /// </summary>
		internal static int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZStream z)
		{
			int r;
			int[] hn = new int[1]; // hufts used in space
			int[] v = new int[19]; // work area for huft_build 
			
			r = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);
			
			if (r == (int)ZLibResultCode.Z_DATA_ERROR)
			{
				z.msg = "oversubscribed dynamic bit lengths tree";
			}
			else if (r == (int)ZLibResultCode.Z_DATA_ERROR || bb[0] == 0)
			{
				z.msg = "incomplete dynamic bit lengths tree";
				r = (int)ZLibResultCode.Z_DATA_ERROR;
			}
			return r;
		}
		
        /// <summary>
        /// Builds dynamic trees
        /// </summary>
		internal static int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZStream z)
		{
			int r;
			int[] hn = new int[1]; // hufts used in space
			int[] v = new int[288]; // work area for huft_build
			
			// build literal/length tree
            r = huft_build(c, 0, nl, 257, InfTreeUtil.cplens, InfTreeUtil.cplext, tl, bl, hp, hn, v);
			if (r != (int)ZLibResultCode.Z_OK || bl[0] == 0)
			{
				if (r == (int)ZLibResultCode.Z_DATA_ERROR)
				{
					z.msg = "oversubscribed literal/length tree";
				}
				else if (r != (int)ZLibResultCode.Z_DATA_ERROR)
				{
					z.msg = "incomplete literal/length tree";
					r = (int)ZLibResultCode.Z_DATA_ERROR;
				}
				return r;
			}
			
			// build distance tree
            r = huft_build(c, nl, nd, 0, InfTreeUtil.cpdist, InfTreeUtil.cpdext, td, bd, hp, hn, v);
			
			if (r != (int)ZLibResultCode.Z_OK || (bd[0] == 0 && nl > 257))
			{
				if (r == (int)ZLibResultCode.Z_DATA_ERROR)
				{
					z.msg = "oversubscribed distance tree";
				}
				else if (r == (int)ZLibResultCode.Z_DATA_ERROR)
				{
					z.msg = "incomplete distance tree";
					r = (int)ZLibResultCode.Z_DATA_ERROR;
				}
				else if (r != (int)ZLibResultCode.Z_DATA_ERROR)
				{
					z.msg = "empty distance tree with lengths";
					r = (int)ZLibResultCode.Z_DATA_ERROR;
				}
				return r;
			}
			
			return (int)ZLibResultCode.Z_OK;
		}
		
        /// <summary>
        /// Build fixed trees
        /// </summary>
		internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZStream z)
		{
            bl[0] = InfTreeUtil.fixed_bl;
            bd[0] = InfTreeUtil.fixed_bd;
            tl[0] = InfTreeUtil.fixed_tl;
            td[0] = InfTreeUtil.fixed_td;
			return (int)ZLibResultCode.Z_OK;
        }

        #endregion
    }
}
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