inflate.js

/*
 Copyright (c) 2012 Gildas Lormeau. 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 JZlib 1.0.2 ymnk, JCraft,Inc.
 * JZlib 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.
 */

(function(obj) {

	// Global
	var MAX_BITS = 15;

	var Z_OK = 0;
	var Z_STREAM_END = 1;
	var Z_NEED_DICT = 2;
	var Z_STREAM_ERROR = -2;
	var Z_DATA_ERROR = -3;
	var Z_MEM_ERROR = -4;
	var Z_BUF_ERROR = -5;

	var inflate_mask = [ 0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff, 0x000003ff,
			0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff, 0x0000ffff ];

	var MANY = 1440;

	var MAX_WBITS = 15; // 32K LZ77 window
	var DEF_WBITS = MAX_WBITS;

	// JZlib version : "1.0.2"
	var Z_NO_FLUSH = 0;
	var Z_FINISH = 4;

	// InfTree
	var fixed_bl = 9;
	var fixed_bd = 5;

	var 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 ];
	var 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.
	var 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
	var 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
	];

	var 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 ];

	var 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.
	var BMAX = 15; // maximum bit length of any code

	function InfTree() {
		var that = this;

		var hn; // hufts used in space
		var v; // work area for huft_build
		var c; // bit length count table
		var r; // table entry for structure assignment
		var u; // table stack
		var x; // bit offsets, then code stack

		function huft_build(b, // code lengths in bits (all assumed <=
		// BMAX)
		bindex, n, // number of codes (assumed <= 288)
		s, // number of simple-valued codes (0..s-1)
		d, // list of base values for non-simple codes
		e, // list of extra bits for non-simple codes
		t, // result: starting table
		m, // maximum lookup bits, returns actual
		hp,// space for trees
		hn,// hufts used in space
		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.

			var a; // counter for codes of length k
			var f; // i repeats in table every f entries
			var g; // maximum code length
			var h; // table level
			var i; // counter, current code
			var j; // counter
			var k; // number of bits in current code
			var l; // bits per table (returned in m)
			var mask; // (1 << w) - 1, to avoid cc -O bug on HP
			var p; // pointer into c[], b[], or v[]
			var q; // points to current table
			var w; // bits before this table == (l * h)
			var xp; // pointer into x
			var y; // number of dummy codes added
			var 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
							hp.set(r, (u[h - 1] + j) * 3);
							// 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) {
						hp.set(r, (q + j) * 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;
		}

		function initWorkArea(vsize) {
			var i;
			if (!hn) {
				hn = []; // []; //new Array(1);
				v = []; // new Array(vsize);
				c = new Int32Array(BMAX + 1); // new Array(BMAX + 1);
				r = []; // new Array(3);
				u = new Int32Array(BMAX); // new Array(BMAX);
				x = new Int32Array(BMAX + 1); // new Array(BMAX + 1);
			}
			if (v.length < vsize) {
				v = []; // new Array(vsize);
			}
			for (i = 0; i < vsize; i++) {
				v[i] = 0;
			}
			for (i = 0; i < BMAX + 1; i++) {
				c[i] = 0;
			}
			for (i = 0; i < 3; i++) {
				r[i] = 0;
			}
			// for(int i=0; i<BMAX; i++){u[i]=0;}
			u.set(c.subarray(0, BMAX), 0);
			// for(int i=0; i<BMAX+1; i++){x[i]=0;}
			x.set(c.subarray(0, BMAX + 1), 0);
		}

		that.inflate_trees_bits = function(c, // 19 code lengths
		bb, // bits tree desired/actual depth
		tb, // bits tree result
		hp, // space for trees
		z // for messages
		) {
			var 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;
		};

		that.inflate_trees_dynamic = function(nl, // number of literal/length codes
		nd, // number of distance codes
		c, // that many (total) code lengths
		bl, // literal desired/actual bit depth
		bd, // distance desired/actual bit depth
		tl, // literal/length tree result
		td, // distance tree result
		hp, // space for trees
		z // for messages
		) {
			var 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;
		};

	}

	InfTree.inflate_trees_fixed = function(bl, // literal desired/actual bit depth
	bd, // distance desired/actual bit depth
	tl,// literal/length tree result
	td,// distance tree result
	z // for memory allocation
	) {
		bl[0] = fixed_bl;
		bd[0] = fixed_bd;
		tl[0] = fixed_tl;
		td[0] = fixed_td;
		return Z_OK;
	};

	// InfCodes

	// waiting for "i:"=input,
	// "o:"=output,
	// "x:"=nothing
	var START = 0; // x: set up for LEN
	var LEN = 1; // i: get length/literal/eob next
	var LENEXT = 2; // i: getting length extra (have base)
	var DIST = 3; // i: get distance next
	var DISTEXT = 4;// i: getting distance extra
	var COPY = 5; // o: copying bytes in window, waiting
	// for space
	var LIT = 6; // o: got literal, waiting for output
	// space
	var WASH = 7; // o: got eob, possibly still output
	// waiting
	var END = 8; // x: got eob and all data flushed
	var BADCODE = 9;// x: got error

	function InfCodes() {
		var that = this;

		var mode; // current inflate_codes mode

		// mode dependent information
		var len = 0;

		var tree; // pointer into tree
		var tree_index = 0;
		var need = 0; // bits needed

		var lit = 0;

		// if EXT or COPY, where and how much
		var get = 0; // bits to get for extra
		var dist = 0; // distance back to copy from

		var lbits = 0; // ltree bits decoded per branch
		var dbits = 0; // dtree bits decoder per branch
		var ltree; // literal/length/eob tree
		var ltree_index = 0; // literal/length/eob tree
		var dtree; // distance tree
		var dtree_index = 0; // distance tree

		// Called with number of bytes left to write in window at least 258
		// (the maximum string length) and number of input bytes available
		// at least ten. The ten bytes are six bytes for the longest length/
		// distance pair plus four bytes for overloading the bit buffer.

		function inflate_fast(bl, bd, tl, tl_index, td, td_index, s, z) {
			var t; // temporary pointer
			var tp; // temporary pointer
			var tp_index; // temporary pointer
			var e; // extra bits or operation
			var b; // bit buffer
			var k; // bits in bit buffer
			var p; // input data pointer
			var n; // bytes available there
			var q; // output window write pointer
			var m; // bytes to end of window or read pointer
			var ml; // mask for literal/length tree
			var md; // mask for distance tree
			var c; // bytes to copy
			var d; // distance back to copy from
			var r; // copy source pointer

			var tp_index_t_3; // (tp_index+t)*3

			// load input, output, bit values
			p = z.next_in_index;
			n = z.avail_in;
			b = s.bitb;
			k = s.bitk;
			q = s.write;
			m = q < s.read ? s.read - q - 1 : s.end - q;

			// initialize masks
			ml = inflate_mask[bl];
			md = inflate_mask[bd];

			// do until not enough input or output space for fast loop
			do { // assume called with m >= 258 && n >= 10
				// get literal/length code
				while (k < (20)) { // max bits for literal/length code
					n--;
					b |= (z.read_byte(p++) & 0xff) << k;
					k += 8;
				}

				t = b & ml;
				tp = tl;
				tp_index = tl_index;
				tp_index_t_3 = (tp_index + t) * 3;
				if ((e = tp[tp_index_t_3]) === 0) {
					b >>= (tp[tp_index_t_3 + 1]);
					k -= (tp[tp_index_t_3 + 1]);

					s.window[q++] = /* (byte) */tp[tp_index_t_3 + 2];
					m--;
					continue;
				}
				do {

					b >>= (tp[tp_index_t_3 + 1]);
					k -= (tp[tp_index_t_3 + 1]);

					if ((e & 16) !== 0) {
						e &= 15;
						c = tp[tp_index_t_3 + 2] + (/* (int) */b & inflate_mask[e]);

						b >>= e;
						k -= e;

						// decode distance base of block to copy
						while (k < (15)) { // max bits for distance code
							n--;
							b |= (z.read_byte(p++) & 0xff) << k;
							k += 8;
						}

						t = b & md;
						tp = td;
						tp_index = td_index;
						tp_index_t_3 = (tp_index + t) * 3;
						e = tp[tp_index_t_3];

						do {

							b >>= (tp[tp_index_t_3 + 1]);
							k -= (tp[tp_index_t_3 + 1]);

							if ((e & 16) !== 0) {
								// get extra bits to add to distance base
								e &= 15;
								while (k < (e)) { // get extra bits (up to 13)
									n--;
									b |= (z.read_byte(p++) & 0xff) << k;
									k += 8;
								}

								d = tp[tp_index_t_3 + 2] + (b & inflate_mask[e]);

								b >>= (e);
								k -= (e);

								// do the copy
								m -= c;
								if (q >= d) { // offset before dest
									// just copy
									r = q - d;
									if (q - r > 0 && 2 > (q - r)) {
										s.window[q++] = s.window[r++]; // minimum
										// count is
										// three,
										s.window[q++] = s.window[r++]; // so unroll
										// loop a
										// little
										c -= 2;
									} else {
										s.window.set(s.window.subarray(r, r + 2), q);
										q += 2;
										r += 2;
										c -= 2;
									}
								} else { // else offset after destination
									r = q - d;
									do {
										r += s.end; // force pointer in window
									} while (r < 0); // covers invalid distances
									e = s.end - r;
									if (c > e) { // if source crosses,
										c -= e; // wrapped copy
										if (q - r > 0 && e > (q - r)) {
											do {
												s.window[q++] = s.window[r++];
											} while (--e !== 0);
										} else {
											s.window.set(s.window.subarray(r, r + e), q);
											q += e;
											r += e;
											e = 0;
										}
										r = 0; // copy rest from start of window
									}

								}

								// copy all or what's left
								if (q - r > 0 && c > (q - r)) {
									do {
										s.window[q++] = s.window[r++];
									} while (--c !== 0);
								} else {
									s.window.set(s.window.subarray(r, r + c), q);
									q += c;
									r += c;
									c = 0;
								}
								break;
							} else if ((e & 64) === 0) {
								t += tp[tp_index_t_3 + 2];
								t += (b & inflate_mask[e]);
								tp_index_t_3 = (tp_index + t) * 3;
								e = tp[tp_index_t_3];
							} else {
								z.msg = "invalid distance code";

								c = z.avail_in - n;
								c = (k >> 3) < c ? k >> 3 : c;
								n += c;
								p -= c;
								k -= c << 3;

								s.bitb = b;
								s.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								s.write = q;

								return Z_DATA_ERROR;
							}
						} while (true);
						break;
					}

					if ((e & 64) === 0) {
						t += tp[tp_index_t_3 + 2];
						t += (b & inflate_mask[e]);
						tp_index_t_3 = (tp_index + t) * 3;
						if ((e = tp[tp_index_t_3]) === 0) {

							b >>= (tp[tp_index_t_3 + 1]);
							k -= (tp[tp_index_t_3 + 1]);

							s.window[q++] = /* (byte) */tp[tp_index_t_3 + 2];
							m--;
							break;
						}
					} else if ((e & 32) !== 0) {

						c = z.avail_in - n;
						c = (k >> 3) < c ? k >> 3 : c;
						n += c;
						p -= c;
						k -= c << 3;

						s.bitb = b;
						s.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						s.write = q;

						return Z_STREAM_END;
					} else {
						z.msg = "invalid literal/length code";

						c = z.avail_in - n;
						c = (k >> 3) < c ? k >> 3 : c;
						n += c;
						p -= c;
						k -= c << 3;

						s.bitb = b;
						s.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						s.write = q;

						return Z_DATA_ERROR;
					}
				} while (true);
			} while (m >= 258 && n >= 10);

			// not enough input or output--restore pointers and return
			c = z.avail_in - n;
			c = (k >> 3) < c ? k >> 3 : c;
			n += c;
			p -= c;
			k -= c << 3;

			s.bitb = b;
			s.bitk = k;
			z.avail_in = n;
			z.total_in += p - z.next_in_index;
			z.next_in_index = p;
			s.write = q;

			return Z_OK;
		}

		that.init = function(bl, bd, tl, tl_index, td, td_index, z) {
			mode = START;
			lbits = /* (byte) */bl;
			dbits = /* (byte) */bd;
			ltree = tl;
			ltree_index = tl_index;
			dtree = td;
			dtree_index = td_index;
			tree = null;
		};

		that.proc = function(s, z, r) {
			var j; // temporary storage
			var t; // temporary pointer
			var tindex; // temporary pointer
			var e; // extra bits or operation
			var b = 0; // bit buffer
			var k = 0; // bits in bit buffer
			var p = 0; // input data pointer
			var n; // bytes available there
			var q; // output window write pointer
			var m; // bytes to end of window or read pointer
			var f; // pointer to copy strings from

			// copy input/output information to locals (UPDATE macro restores)
			p = z.next_in_index;
			n = z.avail_in;
			b = s.bitb;
			k = s.bitk;
			q = s.write;
			m = q < s.read ? s.read - q - 1 : s.end - q;

			// process input and output based on current state
			while (true) {
				switch (mode) {
				// waiting for "i:"=input, "o:"=output, "x:"=nothing
				case START: // x: set up for LEN
					if (m >= 258 && n >= 10) {

						s.bitb = b;
						s.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						s.write = q;
						r = inflate_fast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, s, z);

						p = z.next_in_index;
						n = z.avail_in;
						b = s.bitb;
						k = s.bitk;
						q = s.write;
						m = q < s.read ? s.read - q - 1 : s.end - q;

						if (r != Z_OK) {
							mode = r == Z_STREAM_END ? WASH : BADCODE;
							break;
						}
					}
					need = lbits;
					tree = ltree;
					tree_index = ltree_index;

					mode = LEN;
				case LEN: // i: get length/literal/eob next
					j = need;

					while (k < (j)) {
						if (n !== 0)
							r = Z_OK;
						else {

							s.bitb = b;
							s.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							s.write = q;
							return s.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					tindex = (tree_index + (b & inflate_mask[j])) * 3;

					b >>>= (tree[tindex + 1]);
					k -= (tree[tindex + 1]);

					e = tree[tindex];

					if (e === 0) { // literal
						lit = tree[tindex + 2];
						mode = LIT;
						break;
					}
					if ((e & 16) !== 0) { // length
						get = e & 15;
						len = tree[tindex + 2];
						mode = LENEXT;
						break;
					}
					if ((e & 64) === 0) { // next table
						need = e;
						tree_index = tindex / 3 + tree[tindex + 2];
						break;
					}
					if ((e & 32) !== 0) { // end of block
						mode = WASH;
						break;
					}
					mode = BADCODE; // invalid code
					z.msg = "invalid literal/length code";
					r = Z_DATA_ERROR;

					s.bitb = b;
					s.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					s.write = q;
					return s.inflate_flush(z, r);

				case LENEXT: // i: getting length extra (have base)
					j = get;

					while (k < (j)) {
						if (n !== 0)
							r = Z_OK;
						else {

							s.bitb = b;
							s.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							s.write = q;
							return s.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					len += (b & inflate_mask[j]);

					b >>= j;
					k -= j;

					need = dbits;
					tree = dtree;
					tree_index = dtree_index;
					mode = DIST;
				case DIST: // i: get distance next
					j = need;

					while (k < (j)) {
						if (n !== 0)
							r = Z_OK;
						else {

							s.bitb = b;
							s.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							s.write = q;
							return s.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					tindex = (tree_index + (b & inflate_mask[j])) * 3;

					b >>= tree[tindex + 1];
					k -= tree[tindex + 1];

					e = (tree[tindex]);
					if ((e & 16) !== 0) { // distance
						get = e & 15;
						dist = tree[tindex + 2];
						mode = DISTEXT;
						break;
					}
					if ((e & 64) === 0) { // next table
						need = e;
						tree_index = tindex / 3 + tree[tindex + 2];
						break;
					}
					mode = BADCODE; // invalid code
					z.msg = "invalid distance code";
					r = Z_DATA_ERROR;

					s.bitb = b;
					s.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					s.write = q;
					return s.inflate_flush(z, r);

				case DISTEXT: // i: getting distance extra
					j = get;

					while (k < (j)) {
						if (n !== 0)
							r = Z_OK;
						else {

							s.bitb = b;
							s.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							s.write = q;
							return s.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					dist += (b & inflate_mask[j]);

					b >>= j;
					k -= j;

					mode = COPY;
				case COPY: // o: copying bytes in window, waiting for space
					f = q - dist;
					while (f < 0) { // modulo window size-"while" instead
						f += s.end; // of "if" handles invalid distances
					}
					while (len !== 0) {

						if (m === 0) {
							if (q == s.end && s.read !== 0) {
								q = 0;
								m = q < s.read ? s.read - q - 1 : s.end - q;
							}
							if (m === 0) {
								s.write = q;
								r = s.inflate_flush(z, r);
								q = s.write;
								m = q < s.read ? s.read - q - 1 : s.end - q;

								if (q == s.end && s.read !== 0) {
									q = 0;
									m = q < s.read ? s.read - q - 1 : s.end - q;
								}

								if (m === 0) {
									s.bitb = b;
									s.bitk = k;
									z.avail_in = n;
									z.total_in += p - z.next_in_index;
									z.next_in_index = p;
									s.write = q;
									return s.inflate_flush(z, r);
								}
							}
						}

						s.window[q++] = s.window[f++];
						m--;

						if (f == s.end)
							f = 0;
						len--;
					}
					mode = START;
					break;
				case LIT: // o: got literal, waiting for output space
					if (m === 0) {
						if (q == s.end && s.read !== 0) {
							q = 0;
							m = q < s.read ? s.read - q - 1 : s.end - q;
						}
						if (m === 0) {
							s.write = q;
							r = s.inflate_flush(z, r);
							q = s.write;
							m = q < s.read ? s.read - q - 1 : s.end - q;

							if (q == s.end && s.read !== 0) {
								q = 0;
								m = q < s.read ? s.read - q - 1 : s.end - q;
							}
							if (m === 0) {
								s.bitb = b;
								s.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								s.write = q;
								return s.inflate_flush(z, r);
							}
						}
					}
					r = Z_OK;

					s.window[q++] = /* (byte) */lit;
					m--;

					mode = START;
					break;
				case WASH: // o: got eob, possibly more output
					if (k > 7) { // return unused byte, if any
						k -= 8;
						n++;
						p--; // can always return one
					}

					s.write = q;
					r = s.inflate_flush(z, r);
					q = s.write;
					m = q < s.read ? s.read - q - 1 : s.end - q;

					if (s.read != s.write) {
						s.bitb = b;
						s.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						s.write = q;
						return s.inflate_flush(z, r);
					}
					mode = END;
				case END:
					r = Z_STREAM_END;
					s.bitb = b;
					s.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					s.write = q;
					return s.inflate_flush(z, r);

				case BADCODE: // x: got error

					r = Z_DATA_ERROR;

					s.bitb = b;
					s.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					s.write = q;
					return s.inflate_flush(z, r);

				default:
					r = Z_STREAM_ERROR;

					s.bitb = b;
					s.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					s.write = q;
					return s.inflate_flush(z, r);
				}
			}
		};

		that.free = function(z) {
			// ZFREE(z, c);
		};

	}

	// InfBlocks

	// Table for deflate from PKZIP's appnote.txt.
	var 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 ];

	var TYPE = 0; // get type bits (3, including end bit)
	var LENS = 1; // get lengths for stored
	var STORED = 2;// processing stored block
	var TABLE = 3; // get table lengths
	var BTREE = 4; // get bit lengths tree for a dynamic
	// block
	var DTREE = 5; // get length, distance trees for a
	// dynamic block
	var CODES = 6; // processing fixed or dynamic block
	var DRY = 7; // output remaining window bytes
	var DONELOCKS = 8; // finished last block, done
	var BADBLOCKS = 9; // ot a data error--stuck here

	function InfBlocks(z, w) {
		var that = this;

		var mode = TYPE; // current inflate_block mode

		var left = 0; // if STORED, bytes left to copy

		var table = 0; // table lengths (14 bits)
		var index = 0; // index into blens (or border)
		var blens; // bit lengths of codes
		var bb = [ 0 ]; // bit length tree depth
		var tb = [ 0 ]; // bit length decoding tree

		var codes = new InfCodes(); // if CODES, current state

		var last = 0; // true if this block is the last block

		var hufts = new Int32Array(MANY * 3); // single malloc for tree space
		var check = 0; // check on output
		var inftree = new InfTree();

		that.bitk = 0; // bits in bit buffer
		that.bitb = 0; // bit buffer
		that.window = new Uint8Array(w); // sliding window
		that.end = w; // one byte after sliding window
		that.read = 0; // window read pointer
		that.write = 0; // window write pointer

		that.reset = function(z, c) {
			if (c)
				c[0] = check;
			// if (mode == BTREE || mode == DTREE) {
			// }
			if (mode == CODES) {
				codes.free(z);
			}
			mode = TYPE;
			that.bitk = 0;
			that.bitb = 0;
			that.read = that.write = 0;
		};

		that.reset(z, null);

		// copy as much as possible from the sliding window to the output area
		that.inflate_flush = function(z, r) {
			var n;
			var p;
			var q;

			// local copies of source and destination pointers
			p = z.next_out_index;
			q = that.read;

			// compute number of bytes to copy as far as end of window
			n = /* (int) */((q <= that.write ? that.write : that.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;

			// copy as far as end of window
			z.next_out.set(that.window.subarray(q, q + n), p);
			p += n;
			q += n;

			// see if more to copy at beginning of window
			if (q == that.end) {
				// wrap pointers
				q = 0;
				if (that.write == that.end)
					that.write = 0;

				// compute bytes to copy
				n = that.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;

				// copy
				z.next_out.set(that.window.subarray(q, q + n), p);
				p += n;
				q += n;
			}

			// update pointers
			z.next_out_index = p;
			that.read = q;

			// done
			return r;
		};

		that.proc = function(z, r) {
			var t; // temporary storage
			var b; // bit buffer
			var k; // bits in bit buffer
			var p; // input data pointer
			var n; // bytes available there
			var q; // output window write pointer
			var m; // bytes to end of window or read pointer

			var i;

			// copy input/output information to locals (UPDATE macro restores)
			// {
			p = z.next_in_index;
			n = z.avail_in;
			b = that.bitb;
			k = that.bitk;
			// }
			// {
			q = that.write;
			m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);
			// }

			// process input based on current state
			// DEBUG dtree
			while (true) {
				switch (mode) {
				case TYPE:

					while (k < (3)) {
						if (n !== 0) {
							r = Z_OK;
						} else {
							that.bitb = b;
							that.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							that.write = q;
							return that.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(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
						// {
						var bl = []; // new Array(1);
						var bd = []; // new Array(1);
						var tl = [ [] ]; // new Array(1);
						var td = [ [] ]; // new Array(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 = BADBLOCKS;
						z.msg = "invalid block type";
						r = Z_DATA_ERROR;

						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}
					break;
				case LENS:

					while (k < (32)) {
						if (n !== 0) {
							r = Z_OK;
						} else {
							that.bitb = b;
							that.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							that.write = q;
							return that.inflate_flush(z, r);
						}
						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					if ((((~b) >>> 16) & 0xffff) != (b & 0xffff)) {
						mode = BADBLOCKS;
						z.msg = "invalid stored block lengths";
						r = Z_DATA_ERROR;

						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.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) {
						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}

					if (m === 0) {
						if (q == that.end && that.read !== 0) {
							q = 0;
							m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);
						}
						if (m === 0) {
							that.write = q;
							r = that.inflate_flush(z, r);
							q = that.write;
							m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);
							if (q == that.end && that.read !== 0) {
								q = 0;
								m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);
							}
							if (m === 0) {
								that.bitb = b;
								that.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								that.write = q;
								return that.inflate_flush(z, r);
							}
						}
					}
					r = Z_OK;

					t = left;
					if (t > n)
						t = n;
					if (t > m)
						t = m;
					that.window.set(z.read_buf(p, t), q);
					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 {
							that.bitb = b;
							that.bitk = k;
							z.avail_in = n;
							z.total_in += p - z.next_in_index;
							z.next_in_index = p;
							that.write = q;
							return that.inflate_flush(z, r);
						}

						n--;
						b |= (z.read_byte(p++) & 0xff) << k;
						k += 8;
					}

					table = t = (b & 0x3fff);
					if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29) {
						mode = BADBLOCKS;
						z.msg = "too many length or distance symbols";
						r = Z_DATA_ERROR;

						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}
					t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
					if (!blens || blens.length < t) {
						blens = []; // new Array(t);
					} else {
						for (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 {
								that.bitb = b;
								that.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								that.write = q;
								return that.inflate_flush(z, r);
							}
							n--;
							b |= (z.read_byte(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 = BADBLOCKS;
						}

						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}

					index = 0;
					mode = DTREE;
				case DTREE:
					while (true) {
						t = table;
						if (!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f))) {
							break;
						}

						var h;
						var j, c;

						t = bb[0];

						while (k < (t)) {
							if (n !== 0) {
								r = Z_OK;
							} else {
								that.bitb = b;
								that.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								that.write = q;
								return that.inflate_flush(z, r);
							}
							n--;
							b |= (z.read_byte(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 {
									that.bitb = b;
									that.bitk = k;
									z.avail_in = n;
									z.total_in += p - z.next_in_index;
									z.next_in_index = p;
									that.write = q;
									return that.inflate_flush(z, r);
								}
								n--;
								b |= (z.read_byte(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 = BADBLOCKS;
								z.msg = "invalid bit length repeat";
								r = Z_DATA_ERROR;

								that.bitb = b;
								that.bitk = k;
								z.avail_in = n;
								z.total_in += p - z.next_in_index;
								z.next_in_index = p;
								that.write = q;
								return that.inflate_flush(z, r);
							}

							c = c == 16 ? blens[i - 1] : 0;
							do {
								blens[i++] = c;
							} while (--j !== 0);
							index = i;
						}
					}

					tb[0] = -1;
					// {
					var bl_ = []; // new Array(1);
					var bd_ = []; // new Array(1);
					var tl_ = []; // new Array(1);
					var td_ = []; // new Array(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 = BADBLOCKS;
						}
						r = t;

						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}
					codes.init(bl_[0], bd_[0], hufts, tl_[0], hufts, td_[0], z);
					// }
					mode = CODES;
				case CODES:
					that.bitb = b;
					that.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					that.write = q;

					if ((r = codes.proc(that, z, r)) != Z_STREAM_END) {
						return that.inflate_flush(z, r);
					}
					r = Z_OK;
					codes.free(z);

					p = z.next_in_index;
					n = z.avail_in;
					b = that.bitb;
					k = that.bitk;
					q = that.write;
					m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);

					if (last === 0) {
						mode = TYPE;
						break;
					}
					mode = DRY;
				case DRY:
					that.write = q;
					r = that.inflate_flush(z, r);
					q = that.write;
					m = /* (int) */(q < that.read ? that.read - q - 1 : that.end - q);
					if (that.read != that.write) {
						that.bitb = b;
						that.bitk = k;
						z.avail_in = n;
						z.total_in += p - z.next_in_index;
						z.next_in_index = p;
						that.write = q;
						return that.inflate_flush(z, r);
					}
					mode = DONELOCKS;
				case DONELOCKS:
					r = Z_STREAM_END;

					that.bitb = b;
					that.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					that.write = q;
					return that.inflate_flush(z, r);
				case BADBLOCKS:
					r = Z_DATA_ERROR;

					that.bitb = b;
					that.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					that.write = q;
					return that.inflate_flush(z, r);

				default:
					r = Z_STREAM_ERROR;

					that.bitb = b;
					that.bitk = k;
					z.avail_in = n;
					z.total_in += p - z.next_in_index;
					z.next_in_index = p;
					that.write = q;
					return that.inflate_flush(z, r);
				}
			}
		};

		that.free = function(z) {
			that.reset(z, null);
			that.window = null;
			hufts = null;
			// ZFREE(z, s);
		};

		that.set_dictionary = function(d, start, n) {
			that.window.set(d.subarray(start, start + n), 0);
			that.read = that.write = n;
		};

		// Returns true if inflate is currently at the end of a block generated
		// by Z_SYNC_FLUSH or Z_FULL_FLUSH.
		that.sync_point = function() {
			return mode == LENS ? 1 : 0;
		};

	}

	// Inflate

	// preset dictionary flag in zlib header
	var PRESET_DICT = 0x20;

	var Z_DEFLATED = 8;

	var METHOD = 0; // waiting for method byte
	var FLAG = 1; // waiting for flag byte
	var DICT4 = 2; // four dictionary check bytes to go
	var DICT3 = 3; // three dictionary check bytes to go
	var DICT2 = 4; // two dictionary check bytes to go
	var DICT1 = 5; // one dictionary check byte to go
	var DICT0 = 6; // waiting for inflateSetDictionary
	var BLOCKS = 7; // decompressing blocks
	var DONE = 12; // finished check, done
	var BAD = 13; // got an error--stay here

	var mark = [ 0, 0, 0xff, 0xff ];

	function Inflate() {
		var that = this;

		that.mode = 0; // current inflate mode

		// mode dependent information
		that.method = 0; // if FLAGS, method byte

		// if CHECK, check values to compare
		that.was = [ 0 ]; // new Array(1); // computed check value
		that.need = 0; // stream check value

		// if BAD, inflateSync's marker bytes count
		that.marker = 0;

		// mode independent information
		that.wbits = 0; // log2(window size) (8..15, defaults to 15)

		// this.blocks; // current inflate_blocks state

		function inflateReset(z) {
			if (!z || !z.istate)
				return Z_STREAM_ERROR;

			z.total_in = z.total_out = 0;
			z.msg = null;
			z.istate.mode = BLOCKS;
			z.istate.blocks.reset(z, null);
			return Z_OK;
		}

		that.inflateEnd = function(z) {
			if (that.blocks)
				that.blocks.free(z);
			that.blocks = null;
			// ZFREE(z, z->state);
			return Z_OK;
		};

		that.inflateInit = function(z, w) {
			z.msg = null;
			that.blocks = null;

			// set window size
			if (w < 8 || w > 15) {
				that.inflateEnd(z);
				return Z_STREAM_ERROR;
			}
			that.wbits = w;

			z.istate.blocks = new InfBlocks(z, 1 << w);

			// reset state
			inflateReset(z);
			return Z_OK;
		};

		that.inflate = function(z, f) {
			var r;
			var b;

			if (!z || !z.istate || !z.next_in)
				return Z_STREAM_ERROR;
			f = f == Z_FINISH ? Z_BUF_ERROR : Z_OK;
			r = Z_BUF_ERROR;
			while (true) {
				// System.out.println("mode: "+z.istate.mode);
				switch (z.istate.mode) {
				case METHOD:

					if (z.avail_in === 0)
						return r;
					r = f;

					z.avail_in--;
					z.total_in++;
					if (((z.istate.method = z.read_byte(z.next_in_index++)) & 0xf) != Z_DEFLATED) {
						z.istate.mode = BAD;
						z.msg = "unknown compression method";
						z.istate.marker = 5; // can't try inflateSync
						break;
					}
					if ((z.istate.method >> 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.read_byte(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.read_byte(z.next_in_index++) & 0xff) << 24) & 0xff000000;
					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.read_byte(z.next_in_index++) & 0xff) << 16) & 0xff0000;
					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.read_byte(z.next_in_index++) & 0xff) << 8) & 0xff00;
					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.read_byte(z.next_in_index++) & 0xff);
					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);
					z.istate.mode = DONE;
				case DONE:
					return Z_STREAM_END;
				case BAD:
					return Z_DATA_ERROR;
				default:
					return Z_STREAM_ERROR;
				}
			}
		};

		that.inflateSetDictionary = function(z, dictionary, dictLength) {
			var index = 0;
			var length = dictLength;
			if (!z || !z.istate || z.istate.mode != DICT0)
				return Z_STREAM_ERROR;

			if (length >= (1 << z.istate.wbits)) {
				length = (1 << z.istate.wbits) - 1;
				index = dictLength - length;
			}
			z.istate.blocks.set_dictionary(dictionary, index, length);
			z.istate.mode = BLOCKS;
			return Z_OK;
		};

		that.inflateSync = function(z) {
			var n; // number of bytes to look at
			var p; // pointer to bytes
			var m; // number of marker bytes found in a row
			var r, w; // temporaries to save total_in and total_out

			// set up
			if (!z || !z.istate)
				return Z_STREAM_ERROR;
			if (z.istate.mode != BAD) {
				z.istate.mode = BAD;
				z.istate.marker = 0;
			}
			if ((n = z.avail_in) === 0)
				return Z_BUF_ERROR;
			p = z.next_in_index;
			m = z.istate.marker;

			// search
			while (n !== 0 && m < 4) {
				if (z.read_byte(p) == mark[m]) {
					m++;
				} else if (z.read_byte(p) !== 0) {
					m = 0;
				} else {
					m = 4 - m;
				}
				p++;
				n--;
			}

			// restore
			z.total_in += p - z.next_in_index;
			z.next_in_index = p;
			z.avail_in = n;
			z.istate.marker = m;

			// return no joy or set up to restart on a new block
			if (m != 4) {
				return Z_DATA_ERROR;
			}
			r = z.total_in;
			w = z.total_out;
			inflateReset(z);
			z.total_in = r;
			z.total_out = w;
			z.istate.mode = BLOCKS;
			return Z_OK;
		};

		// Returns true if inflate is currently at the end of a block generated
		// by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
		// implementation to provide an additional safety check. PPP uses
		// Z_SYNC_FLUSH
		// but removes the length bytes of the resulting empty stored block. When
		// decompressing, PPP checks that at the end of input packet, inflate is
		// waiting for these length bytes.
		that.inflateSyncPoint = function(z) {
			if (!z || !z.istate || !z.istate.blocks)
				return Z_STREAM_ERROR;
			return z.istate.blocks.sync_point();
		};
	}

	// ZStream

	function ZStream() {
	}

	ZStream.prototype = {
		inflateInit : function(bits) {
			var that = this;
			that.istate = new Inflate();
			if (!bits)
				bits = MAX_BITS;
			return that.istate.inflateInit(that, bits);
		},

		inflate : function(f) {
			var that = this;
			if (!that.istate)
				return Z_STREAM_ERROR;
			return that.istate.inflate(that, f);
		},

		inflateEnd : function() {
			var that = this;
			if (!that.istate)
				return Z_STREAM_ERROR;
			var ret = that.istate.inflateEnd(that);
			that.istate = null;
			return ret;
		},

		inflateSync : function() {
			var that = this;
			if (!that.istate)
				return Z_STREAM_ERROR;
			return that.istate.inflateSync(that);
		},
		inflateSetDictionary : function(dictionary, dictLength) {
			var that = this;
			if (!that.istate)
				return Z_STREAM_ERROR;
			return that.istate.inflateSetDictionary(that, dictionary, dictLength);
		},
		read_byte : function(start) {
			var that = this;
			return that.next_in.subarray(start, start + 1)[0];
		},
		read_buf : function(start, size) {
			var that = this;
			return that.next_in.subarray(start, start + size);
		}
	};

	// Inflater

	function Inflater() {
		var that = this;
		var z = new ZStream();
		var bufsize = 512;
		var flush = Z_NO_FLUSH;
		var buf = new Uint8Array(bufsize);
		var nomoreinput = false;

		z.inflateInit();
		z.next_out = buf;

		that.append = function(data, onprogress) {
			var err, buffers = [], lastIndex = 0, bufferIndex = 0, bufferSize = 0, array;
			if (data.length === 0)
				return;
			z.next_in_index = 0;
			z.next_in = data;
			z.avail_in = data.length;
			do {
				z.next_out_index = 0;
				z.avail_out = bufsize;
				if ((z.avail_in === 0) && (!nomoreinput)) { // if buffer is empty and more input is available, refill it
					z.next_in_index = 0;
					nomoreinput = true;
				}
				err = z.inflate(flush);
				if (nomoreinput && (err == Z_BUF_ERROR))
					return -1;
				if (err != Z_OK && err != Z_STREAM_END)
					throw "inflating: " + z.msg;
				if ((nomoreinput || err == Z_STREAM_END) && (z.avail_out == data.length))
					return -1;
				if (z.next_out_index)
					if (z.next_out_index == bufsize)
						buffers.push(new Uint8Array(buf));
					else
						buffers.push(new Uint8Array(buf.subarray(0, z.next_out_index)));
				bufferSize += z.next_out_index;
				if (onprogress && z.next_in_index > 0 && z.next_in_index != lastIndex) {
					onprogress(z.next_in_index);
					lastIndex = z.next_in_index;
				}
			} while (z.avail_in > 0 || z.avail_out === 0);
			array = new Uint8Array(bufferSize);
			buffers.forEach(function(chunk) {
				array.set(chunk, bufferIndex);
				bufferIndex += chunk.length;
			});
			return array;
		};
		that.flush = function() {
			z.inflateEnd();
		};
	}

	var inflater;

	if (obj.zip)
		obj.zip.Inflater = Inflater;
	else {
		inflater = new Inflater();
		obj.addEventListener("message", function(event) {
			var message = event.data;

			if (message.append)
				obj.postMessage({
					onappend : true,
					data : inflater.append(message.data, function(current) {
						obj.postMessage({
							progress : true,
							current : current
						});
					})
				});
			if (message.flush) {
				inflater.flush();
				obj.postMessage({
					onflush : true
				});
			}
		}, false);
	}

})(this);