'use strict';

var deflate = require('../../../../_virtual/deflate2.js');
var common = require('../utils/common.js');
var trees = require('./trees.js');
var adler32 = require('./adler32.js');
var crc32 = require('./crc32.js');
var messages = require('./messages.js');

var hasRequiredDeflate;

function requireDeflate () {
	if (hasRequiredDeflate) return deflate.__exports;
	hasRequiredDeflate = 1;

	// (C) 1995-2013 Jean-loup Gailly and Mark Adler
	// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
	//
	// This software is provided 'as-is', without any express or implied
	// warranty. In no event will the authors be held liable for any damages
	// arising from the use of this software.
	//
	// Permission is granted to anyone to use this software for any purpose,
	// including commercial applications, and to alter it and redistribute it
	// freely, subject to the following restrictions:
	//
	// 1. The origin of this software must not be misrepresented; you must not
	//   claim that you wrote the original software. If you use this software
	//   in a product, an acknowledgment in the product documentation would be
	//   appreciated but is not required.
	// 2. Altered source versions must be plainly marked as such, and must not be
	//   misrepresented as being the original software.
	// 3. This notice may not be removed or altered from any source distribution.

	var utils   = common.__require();
	var trees$1   = trees.__require();
	var adler32$1 = adler32.__require();
	var crc32$1   = crc32.__require();
	var msg     = messages.__require();

	/* Public constants ==========================================================*/
	/* ===========================================================================*/


	/* Allowed flush values; see deflate() and inflate() below for details */
	var Z_NO_FLUSH      = 0;
	var Z_PARTIAL_FLUSH = 1;
	//var Z_SYNC_FLUSH    = 2;
	var Z_FULL_FLUSH    = 3;
	var Z_FINISH        = 4;
	var Z_BLOCK         = 5;
	//var Z_TREES         = 6;


	/* Return codes for the compression/decompression functions. Negative values
	 * are errors, positive values are used for special but normal events.
	 */
	var Z_OK            = 0;
	var Z_STREAM_END    = 1;
	//var Z_NEED_DICT     = 2;
	//var Z_ERRNO         = -1;
	var Z_STREAM_ERROR  = -2;
	var Z_DATA_ERROR    = -3;
	//var Z_MEM_ERROR     = -4;
	var Z_BUF_ERROR     = -5;
	//var Z_VERSION_ERROR = -6;


	/* compression levels */
	//var Z_NO_COMPRESSION      = 0;
	//var Z_BEST_SPEED          = 1;
	//var Z_BEST_COMPRESSION    = 9;
	var Z_DEFAULT_COMPRESSION = -1;


	var Z_FILTERED            = 1;
	var Z_HUFFMAN_ONLY        = 2;
	var Z_RLE                 = 3;
	var Z_FIXED               = 4;
	var Z_DEFAULT_STRATEGY    = 0;

	/* Possible values of the data_type field (though see inflate()) */
	//var Z_BINARY              = 0;
	//var Z_TEXT                = 1;
	//var Z_ASCII               = 1; // = Z_TEXT
	var Z_UNKNOWN             = 2;


	/* The deflate compression method */
	var Z_DEFLATED  = 8;

	/*============================================================================*/


	var MAX_MEM_LEVEL = 9;
	/* Maximum value for memLevel in deflateInit2 */
	var MAX_WBITS = 15;
	/* 32K LZ77 window */
	var DEF_MEM_LEVEL = 8;


	var LENGTH_CODES  = 29;
	/* number of length codes, not counting the special END_BLOCK code */
	var LITERALS      = 256;
	/* number of literal bytes 0..255 */
	var L_CODES       = LITERALS + 1 + LENGTH_CODES;
	/* number of Literal or Length codes, including the END_BLOCK code */
	var D_CODES       = 30;
	/* number of distance codes */
	var BL_CODES      = 19;
	/* number of codes used to transfer the bit lengths */
	var HEAP_SIZE     = 2 * L_CODES + 1;
	/* maximum heap size */
	var MAX_BITS  = 15;
	/* All codes must not exceed MAX_BITS bits */

	var MIN_MATCH = 3;
	var MAX_MATCH = 258;
	var MIN_LOOKAHEAD = (MAX_MATCH + MIN_MATCH + 1);

	var PRESET_DICT = 0x20;

	var INIT_STATE = 42;
	var EXTRA_STATE = 69;
	var NAME_STATE = 73;
	var COMMENT_STATE = 91;
	var HCRC_STATE = 103;
	var BUSY_STATE = 113;
	var FINISH_STATE = 666;

	var BS_NEED_MORE      = 1; /* block not completed, need more input or more output */
	var BS_BLOCK_DONE     = 2; /* block flush performed */
	var BS_FINISH_STARTED = 3; /* finish started, need only more output at next deflate */
	var BS_FINISH_DONE    = 4; /* finish done, accept no more input or output */

	var OS_CODE = 0x03; // Unix :) . Don't detect, use this default.

	function err(strm, errorCode) {
	  strm.msg = msg[errorCode];
	  return errorCode;
	}

	function rank(f) {
	  return ((f) << 1) - ((f) > 4 ? 9 : 0);
	}

	function zero(buf) { var len = buf.length; while (--len >= 0) { buf[len] = 0; } }


	/* =========================================================================
	 * Flush as much pending output as possible. All deflate() output goes
	 * through this function so some applications may wish to modify it
	 * to avoid allocating a large strm->output buffer and copying into it.
	 * (See also read_buf()).
	 */
	function flush_pending(strm) {
	  var s = strm.state;

	  //_tr_flush_bits(s);
	  var len = s.pending;
	  if (len > strm.avail_out) {
	    len = strm.avail_out;
	  }
	  if (len === 0) { return; }

	  utils.arraySet(strm.output, s.pending_buf, s.pending_out, len, strm.next_out);
	  strm.next_out += len;
	  s.pending_out += len;
	  strm.total_out += len;
	  strm.avail_out -= len;
	  s.pending -= len;
	  if (s.pending === 0) {
	    s.pending_out = 0;
	  }
	}


	function flush_block_only(s, last) {
	  trees$1._tr_flush_block(s, (s.block_start >= 0 ? s.block_start : -1), s.strstart - s.block_start, last);
	  s.block_start = s.strstart;
	  flush_pending(s.strm);
	}


	function put_byte(s, b) {
	  s.pending_buf[s.pending++] = b;
	}


	/* =========================================================================
	 * Put a short in the pending buffer. The 16-bit value is put in MSB order.
	 * IN assertion: the stream state is correct and there is enough room in
	 * pending_buf.
	 */
	function putShortMSB(s, b) {
	//  put_byte(s, (Byte)(b >> 8));
	//  put_byte(s, (Byte)(b & 0xff));
	  s.pending_buf[s.pending++] = (b >>> 8) & 0xff;
	  s.pending_buf[s.pending++] = b & 0xff;
	}


	/* ===========================================================================
	 * Read a new buffer from the current input stream, update the adler32
	 * and total number of bytes read.  All deflate() input goes through
	 * this function so some applications may wish to modify it to avoid
	 * allocating a large strm->input buffer and copying from it.
	 * (See also flush_pending()).
	 */
	function read_buf(strm, buf, start, size) {
	  var len = strm.avail_in;

	  if (len > size) { len = size; }
	  if (len === 0) { return 0; }

	  strm.avail_in -= len;

	  // zmemcpy(buf, strm->next_in, len);
	  utils.arraySet(buf, strm.input, strm.next_in, len, start);
	  if (strm.state.wrap === 1) {
	    strm.adler = adler32$1(strm.adler, buf, len, start);
	  }

	  else if (strm.state.wrap === 2) {
	    strm.adler = crc32$1(strm.adler, buf, len, start);
	  }

	  strm.next_in += len;
	  strm.total_in += len;

	  return len;
	}


	/* ===========================================================================
	 * Set match_start to the longest match starting at the given string and
	 * return its length. Matches shorter or equal to prev_length are discarded,
	 * in which case the result is equal to prev_length and match_start is
	 * garbage.
	 * IN assertions: cur_match is the head of the hash chain for the current
	 *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
	 * OUT assertion: the match length is not greater than s->lookahead.
	 */
	function longest_match(s, cur_match) {
	  var chain_length = s.max_chain_length;      /* max hash chain length */
	  var scan = s.strstart; /* current string */
	  var match;                       /* matched string */
	  var len;                           /* length of current match */
	  var best_len = s.prev_length;              /* best match length so far */
	  var nice_match = s.nice_match;             /* stop if match long enough */
	  var limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ?
	      s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/;

	  var _win = s.window; // shortcut

	  var wmask = s.w_mask;
	  var prev  = s.prev;

	  /* Stop when cur_match becomes <= limit. To simplify the code,
	   * we prevent matches with the string of window index 0.
	   */

	  var strend = s.strstart + MAX_MATCH;
	  var scan_end1  = _win[scan + best_len - 1];
	  var scan_end   = _win[scan + best_len];

	  /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
	   * It is easy to get rid of this optimization if necessary.
	   */
	  // Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");

	  /* Do not waste too much time if we already have a good match: */
	  if (s.prev_length >= s.good_match) {
	    chain_length >>= 2;
	  }
	  /* Do not look for matches beyond the end of the input. This is necessary
	   * to make deflate deterministic.
	   */
	  if (nice_match > s.lookahead) { nice_match = s.lookahead; }

	  // Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");

	  do {
	    // Assert(cur_match < s->strstart, "no future");
	    match = cur_match;

	    /* Skip to next match if the match length cannot increase
	     * or if the match length is less than 2.  Note that the checks below
	     * for insufficient lookahead only occur occasionally for performance
	     * reasons.  Therefore uninitialized memory will be accessed, and
	     * conditional jumps will be made that depend on those values.
	     * However the length of the match is limited to the lookahead, so
	     * the output of deflate is not affected by the uninitialized values.
	     */

	    if (_win[match + best_len]     !== scan_end  ||
	        _win[match + best_len - 1] !== scan_end1 ||
	        _win[match]                !== _win[scan] ||
	        _win[++match]              !== _win[scan + 1]) {
	      continue;
	    }

	    /* The check at best_len-1 can be removed because it will be made
	     * again later. (This heuristic is not always a win.)
	     * It is not necessary to compare scan[2] and match[2] since they
	     * are always equal when the other bytes match, given that
	     * the hash keys are equal and that HASH_BITS >= 8.
	     */
	    scan += 2;
	    match++;
	    // Assert(*scan == *match, "match[2]?");

	    /* We check for insufficient lookahead only every 8th comparison;
	     * the 256th check will be made at strstart+258.
	     */
	    do {
	      /*jshint noempty:false*/
	    } while (_win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
	             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
	             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
	             _win[++scan] === _win[++match] && _win[++scan] === _win[++match] &&
	             scan < strend);

	    // Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");

	    len = MAX_MATCH - (strend - scan);
	    scan = strend - MAX_MATCH;

	    if (len > best_len) {
	      s.match_start = cur_match;
	      best_len = len;
	      if (len >= nice_match) {
	        break;
	      }
	      scan_end1  = _win[scan + best_len - 1];
	      scan_end   = _win[scan + best_len];
	    }
	  } while ((cur_match = prev[cur_match & wmask]) > limit && --chain_length !== 0);

	  if (best_len <= s.lookahead) {
	    return best_len;
	  }
	  return s.lookahead;
	}


	/* ===========================================================================
	 * Fill the window when the lookahead becomes insufficient.
	 * Updates strstart and lookahead.
	 *
	 * IN assertion: lookahead < MIN_LOOKAHEAD
	 * OUT assertions: strstart <= window_size-MIN_LOOKAHEAD
	 *    At least one byte has been read, or avail_in == 0; reads are
	 *    performed for at least two bytes (required for the zip translate_eol
	 *    option -- not supported here).
	 */
	function fill_window(s) {
	  var _w_size = s.w_size;
	  var p, n, m, more, str;

	  //Assert(s->lookahead < MIN_LOOKAHEAD, "already enough lookahead");

	  do {
	    more = s.window_size - s.lookahead - s.strstart;

	    // JS ints have 32 bit, block below not needed
	    /* Deal with !@#$% 64K limit: */
	    //if (sizeof(int) <= 2) {
	    //    if (more == 0 && s->strstart == 0 && s->lookahead == 0) {
	    //        more = wsize;
	    //
	    //  } else if (more == (unsigned)(-1)) {
	    //        /* Very unlikely, but possible on 16 bit machine if
	    //         * strstart == 0 && lookahead == 1 (input done a byte at time)
	    //         */
	    //        more--;
	    //    }
	    //}


	    /* If the window is almost full and there is insufficient lookahead,
	     * move the upper half to the lower one to make room in the upper half.
	     */
	    if (s.strstart >= _w_size + (_w_size - MIN_LOOKAHEAD)) {

	      utils.arraySet(s.window, s.window, _w_size, _w_size, 0);
	      s.match_start -= _w_size;
	      s.strstart -= _w_size;
	      /* we now have strstart >= MAX_DIST */
	      s.block_start -= _w_size;

	      /* Slide the hash table (could be avoided with 32 bit values
	       at the expense of memory usage). We slide even when level == 0
	       to keep the hash table consistent if we switch back to level > 0
	       later. (Using level 0 permanently is not an optimal usage of
	       zlib, so we don't care about this pathological case.)
	       */

	      n = s.hash_size;
	      p = n;
	      do {
	        m = s.head[--p];
	        s.head[p] = (m >= _w_size ? m - _w_size : 0);
	      } while (--n);

	      n = _w_size;
	      p = n;
	      do {
	        m = s.prev[--p];
	        s.prev[p] = (m >= _w_size ? m - _w_size : 0);
	        /* If n is not on any hash chain, prev[n] is garbage but
	         * its value will never be used.
	         */
	      } while (--n);

	      more += _w_size;
	    }
	    if (s.strm.avail_in === 0) {
	      break;
	    }

	    /* If there was no sliding:
	     *    strstart <= WSIZE+MAX_DIST-1 && lookahead <= MIN_LOOKAHEAD - 1 &&
	     *    more == window_size - lookahead - strstart
	     * => more >= window_size - (MIN_LOOKAHEAD-1 + WSIZE + MAX_DIST-1)
	     * => more >= window_size - 2*WSIZE + 2
	     * In the BIG_MEM or MMAP case (not yet supported),
	     *   window_size == input_size + MIN_LOOKAHEAD  &&
	     *   strstart + s->lookahead <= input_size => more >= MIN_LOOKAHEAD.
	     * Otherwise, window_size == 2*WSIZE so more >= 2.
	     * If there was sliding, more >= WSIZE. So in all cases, more >= 2.
	     */
	    //Assert(more >= 2, "more < 2");
	    n = read_buf(s.strm, s.window, s.strstart + s.lookahead, more);
	    s.lookahead += n;

	    /* Initialize the hash value now that we have some input: */
	    if (s.lookahead + s.insert >= MIN_MATCH) {
	      str = s.strstart - s.insert;
	      s.ins_h = s.window[str];

	      /* UPDATE_HASH(s, s->ins_h, s->window[str + 1]); */
	      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + 1]) & s.hash_mask;
	//#if MIN_MATCH != 3
	//        Call update_hash() MIN_MATCH-3 more times
	//#endif
	      while (s.insert) {
	        /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
	        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;

	        s.prev[str & s.w_mask] = s.head[s.ins_h];
	        s.head[s.ins_h] = str;
	        str++;
	        s.insert--;
	        if (s.lookahead + s.insert < MIN_MATCH) {
	          break;
	        }
	      }
	    }
	    /* If the whole input has less than MIN_MATCH bytes, ins_h is garbage,
	     * but this is not important since only literal bytes will be emitted.
	     */

	  } while (s.lookahead < MIN_LOOKAHEAD && s.strm.avail_in !== 0);

	  /* If the WIN_INIT bytes after the end of the current data have never been
	   * written, then zero those bytes in order to avoid memory check reports of
	   * the use of uninitialized (or uninitialised as Julian writes) bytes by
	   * the longest match routines.  Update the high water mark for the next
	   * time through here.  WIN_INIT is set to MAX_MATCH since the longest match
	   * routines allow scanning to strstart + MAX_MATCH, ignoring lookahead.
	   */
	//  if (s.high_water < s.window_size) {
	//    var curr = s.strstart + s.lookahead;
	//    var init = 0;
	//
	//    if (s.high_water < curr) {
	//      /* Previous high water mark below current data -- zero WIN_INIT
	//       * bytes or up to end of window, whichever is less.
	//       */
	//      init = s.window_size - curr;
	//      if (init > WIN_INIT)
	//        init = WIN_INIT;
	//      zmemzero(s->window + curr, (unsigned)init);
	//      s->high_water = curr + init;
	//    }
	//    else if (s->high_water < (ulg)curr + WIN_INIT) {
	//      /* High water mark at or above current data, but below current data
	//       * plus WIN_INIT -- zero out to current data plus WIN_INIT, or up
	//       * to end of window, whichever is less.
	//       */
	//      init = (ulg)curr + WIN_INIT - s->high_water;
	//      if (init > s->window_size - s->high_water)
	//        init = s->window_size - s->high_water;
	//      zmemzero(s->window + s->high_water, (unsigned)init);
	//      s->high_water += init;
	//    }
	//  }
	//
	//  Assert((ulg)s->strstart <= s->window_size - MIN_LOOKAHEAD,
	//    "not enough room for search");
	}

	/* ===========================================================================
	 * Copy without compression as much as possible from the input stream, return
	 * the current block state.
	 * This function does not insert new strings in the dictionary since
	 * uncompressible data is probably not useful. This function is used
	 * only for the level=0 compression option.
	 * NOTE: this function should be optimized to avoid extra copying from
	 * window to pending_buf.
	 */
	function deflate_stored(s, flush) {
	  /* Stored blocks are limited to 0xffff bytes, pending_buf is limited
	   * to pending_buf_size, and each stored block has a 5 byte header:
	   */
	  var max_block_size = 0xffff;

	  if (max_block_size > s.pending_buf_size - 5) {
	    max_block_size = s.pending_buf_size - 5;
	  }

	  /* Copy as much as possible from input to output: */
	  for (;;) {
	    /* Fill the window as much as possible: */
	    if (s.lookahead <= 1) {

	      //Assert(s->strstart < s->w_size+MAX_DIST(s) ||
	      //  s->block_start >= (long)s->w_size, "slide too late");
	//      if (!(s.strstart < s.w_size + (s.w_size - MIN_LOOKAHEAD) ||
	//        s.block_start >= s.w_size)) {
	//        throw  new Error("slide too late");
	//      }

	      fill_window(s);
	      if (s.lookahead === 0 && flush === Z_NO_FLUSH) {
	        return BS_NEED_MORE;
	      }

	      if (s.lookahead === 0) {
	        break;
	      }
	      /* flush the current block */
	    }
	    //Assert(s->block_start >= 0L, "block gone");
	//    if (s.block_start < 0) throw new Error("block gone");

	    s.strstart += s.lookahead;
	    s.lookahead = 0;

	    /* Emit a stored block if pending_buf will be full: */
	    var max_start = s.block_start + max_block_size;

	    if (s.strstart === 0 || s.strstart >= max_start) {
	      /* strstart == 0 is possible when wraparound on 16-bit machine */
	      s.lookahead = s.strstart - max_start;
	      s.strstart = max_start;
	      /*** FLUSH_BLOCK(s, 0); ***/
	      flush_block_only(s, false);
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	      /***/


	    }
	    /* Flush if we may have to slide, otherwise block_start may become
	     * negative and the data will be gone:
	     */
	    if (s.strstart - s.block_start >= (s.w_size - MIN_LOOKAHEAD)) {
	      /*** FLUSH_BLOCK(s, 0); ***/
	      flush_block_only(s, false);
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	      /***/
	    }
	  }

	  s.insert = 0;

	  if (flush === Z_FINISH) {
	    /*** FLUSH_BLOCK(s, 1); ***/
	    flush_block_only(s, true);
	    if (s.strm.avail_out === 0) {
	      return BS_FINISH_STARTED;
	    }
	    /***/
	    return BS_FINISH_DONE;
	  }

	  if (s.strstart > s.block_start) {
	    /*** FLUSH_BLOCK(s, 0); ***/
	    flush_block_only(s, false);
	    if (s.strm.avail_out === 0) {
	      return BS_NEED_MORE;
	    }
	    /***/
	  }

	  return BS_NEED_MORE;
	}

	/* ===========================================================================
	 * Compress as much as possible from the input stream, return the current
	 * block state.
	 * This function does not perform lazy evaluation of matches and inserts
	 * new strings in the dictionary only for unmatched strings or for short
	 * matches. It is used only for the fast compression options.
	 */
	function deflate_fast(s, flush) {
	  var hash_head;        /* head of the hash chain */
	  var bflush;           /* set if current block must be flushed */

	  for (;;) {
	    /* Make sure that we always have enough lookahead, except
	     * at the end of the input file. We need MAX_MATCH bytes
	     * for the next match, plus MIN_MATCH bytes to insert the
	     * string following the next match.
	     */
	    if (s.lookahead < MIN_LOOKAHEAD) {
	      fill_window(s);
	      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
	        return BS_NEED_MORE;
	      }
	      if (s.lookahead === 0) {
	        break; /* flush the current block */
	      }
	    }

	    /* Insert the string window[strstart .. strstart+2] in the
	     * dictionary, and set hash_head to the head of the hash chain:
	     */
	    hash_head = 0/*NIL*/;
	    if (s.lookahead >= MIN_MATCH) {
	      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
	      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
	      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
	      s.head[s.ins_h] = s.strstart;
	      /***/
	    }

	    /* Find the longest match, discarding those <= prev_length.
	     * At this point we have always match_length < MIN_MATCH
	     */
	    if (hash_head !== 0/*NIL*/ && ((s.strstart - hash_head) <= (s.w_size - MIN_LOOKAHEAD))) {
	      /* To simplify the code, we prevent matches with the string
	       * of window index 0 (in particular we have to avoid a match
	       * of the string with itself at the start of the input file).
	       */
	      s.match_length = longest_match(s, hash_head);
	      /* longest_match() sets match_start */
	    }
	    if (s.match_length >= MIN_MATCH) {
	      // check_match(s, s.strstart, s.match_start, s.match_length); // for debug only

	      /*** _tr_tally_dist(s, s.strstart - s.match_start,
	                     s.match_length - MIN_MATCH, bflush); ***/
	      bflush = trees$1._tr_tally(s, s.strstart - s.match_start, s.match_length - MIN_MATCH);

	      s.lookahead -= s.match_length;

	      /* Insert new strings in the hash table only if the match length
	       * is not too large. This saves time but degrades compression.
	       */
	      if (s.match_length <= s.max_lazy_match/*max_insert_length*/ && s.lookahead >= MIN_MATCH) {
	        s.match_length--; /* string at strstart already in table */
	        do {
	          s.strstart++;
	          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
	          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
	          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
	          s.head[s.ins_h] = s.strstart;
	          /***/
	          /* strstart never exceeds WSIZE-MAX_MATCH, so there are
	           * always MIN_MATCH bytes ahead.
	           */
	        } while (--s.match_length !== 0);
	        s.strstart++;
	      } else
	      {
	        s.strstart += s.match_length;
	        s.match_length = 0;
	        s.ins_h = s.window[s.strstart];
	        /* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */
	        s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + 1]) & s.hash_mask;

	//#if MIN_MATCH != 3
	//                Call UPDATE_HASH() MIN_MATCH-3 more times
	//#endif
	        /* If lookahead < MIN_MATCH, ins_h is garbage, but it does not
	         * matter since it will be recomputed at next deflate call.
	         */
	      }
	    } else {
	      /* No match, output a literal byte */
	      //Tracevv((stderr,"%c", s.window[s.strstart]));
	      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
	      bflush = trees$1._tr_tally(s, 0, s.window[s.strstart]);

	      s.lookahead--;
	      s.strstart++;
	    }
	    if (bflush) {
	      /*** FLUSH_BLOCK(s, 0); ***/
	      flush_block_only(s, false);
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	      /***/
	    }
	  }
	  s.insert = ((s.strstart < (MIN_MATCH - 1)) ? s.strstart : MIN_MATCH - 1);
	  if (flush === Z_FINISH) {
	    /*** FLUSH_BLOCK(s, 1); ***/
	    flush_block_only(s, true);
	    if (s.strm.avail_out === 0) {
	      return BS_FINISH_STARTED;
	    }
	    /***/
	    return BS_FINISH_DONE;
	  }
	  if (s.last_lit) {
	    /*** FLUSH_BLOCK(s, 0); ***/
	    flush_block_only(s, false);
	    if (s.strm.avail_out === 0) {
	      return BS_NEED_MORE;
	    }
	    /***/
	  }
	  return BS_BLOCK_DONE;
	}

	/* ===========================================================================
	 * Same as above, but achieves better compression. We use a lazy
	 * evaluation for matches: a match is finally adopted only if there is
	 * no better match at the next window position.
	 */
	function deflate_slow(s, flush) {
	  var hash_head;          /* head of hash chain */
	  var bflush;              /* set if current block must be flushed */

	  var max_insert;

	  /* Process the input block. */
	  for (;;) {
	    /* Make sure that we always have enough lookahead, except
	     * at the end of the input file. We need MAX_MATCH bytes
	     * for the next match, plus MIN_MATCH bytes to insert the
	     * string following the next match.
	     */
	    if (s.lookahead < MIN_LOOKAHEAD) {
	      fill_window(s);
	      if (s.lookahead < MIN_LOOKAHEAD && flush === Z_NO_FLUSH) {
	        return BS_NEED_MORE;
	      }
	      if (s.lookahead === 0) { break; } /* flush the current block */
	    }

	    /* Insert the string window[strstart .. strstart+2] in the
	     * dictionary, and set hash_head to the head of the hash chain:
	     */
	    hash_head = 0/*NIL*/;
	    if (s.lookahead >= MIN_MATCH) {
	      /*** INSERT_STRING(s, s.strstart, hash_head); ***/
	      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
	      hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
	      s.head[s.ins_h] = s.strstart;
	      /***/
	    }

	    /* Find the longest match, discarding those <= prev_length.
	     */
	    s.prev_length = s.match_length;
	    s.prev_match = s.match_start;
	    s.match_length = MIN_MATCH - 1;

	    if (hash_head !== 0/*NIL*/ && s.prev_length < s.max_lazy_match &&
	        s.strstart - hash_head <= (s.w_size - MIN_LOOKAHEAD)/*MAX_DIST(s)*/) {
	      /* To simplify the code, we prevent matches with the string
	       * of window index 0 (in particular we have to avoid a match
	       * of the string with itself at the start of the input file).
	       */
	      s.match_length = longest_match(s, hash_head);
	      /* longest_match() sets match_start */

	      if (s.match_length <= 5 &&
	         (s.strategy === Z_FILTERED || (s.match_length === MIN_MATCH && s.strstart - s.match_start > 4096/*TOO_FAR*/))) {

	        /* If prev_match is also MIN_MATCH, match_start is garbage
	         * but we will ignore the current match anyway.
	         */
	        s.match_length = MIN_MATCH - 1;
	      }
	    }
	    /* If there was a match at the previous step and the current
	     * match is not better, output the previous match:
	     */
	    if (s.prev_length >= MIN_MATCH && s.match_length <= s.prev_length) {
	      max_insert = s.strstart + s.lookahead - MIN_MATCH;
	      /* Do not insert strings in hash table beyond this. */

	      //check_match(s, s.strstart-1, s.prev_match, s.prev_length);

	      /***_tr_tally_dist(s, s.strstart - 1 - s.prev_match,
	                     s.prev_length - MIN_MATCH, bflush);***/
	      bflush = trees$1._tr_tally(s, s.strstart - 1 - s.prev_match, s.prev_length - MIN_MATCH);
	      /* Insert in hash table all strings up to the end of the match.
	       * strstart-1 and strstart are already inserted. If there is not
	       * enough lookahead, the last two strings are not inserted in
	       * the hash table.
	       */
	      s.lookahead -= s.prev_length - 1;
	      s.prev_length -= 2;
	      do {
	        if (++s.strstart <= max_insert) {
	          /*** INSERT_STRING(s, s.strstart, hash_head); ***/
	          s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[s.strstart + MIN_MATCH - 1]) & s.hash_mask;
	          hash_head = s.prev[s.strstart & s.w_mask] = s.head[s.ins_h];
	          s.head[s.ins_h] = s.strstart;
	          /***/
	        }
	      } while (--s.prev_length !== 0);
	      s.match_available = 0;
	      s.match_length = MIN_MATCH - 1;
	      s.strstart++;

	      if (bflush) {
	        /*** FLUSH_BLOCK(s, 0); ***/
	        flush_block_only(s, false);
	        if (s.strm.avail_out === 0) {
	          return BS_NEED_MORE;
	        }
	        /***/
	      }

	    } else if (s.match_available) {
	      /* If there was no match at the previous position, output a
	       * single literal. If there was a match but the current match
	       * is longer, truncate the previous match to a single literal.
	       */
	      //Tracevv((stderr,"%c", s->window[s->strstart-1]));
	      /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
	      bflush = trees$1._tr_tally(s, 0, s.window[s.strstart - 1]);

	      if (bflush) {
	        /*** FLUSH_BLOCK_ONLY(s, 0) ***/
	        flush_block_only(s, false);
	        /***/
	      }
	      s.strstart++;
	      s.lookahead--;
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	    } else {
	      /* There is no previous match to compare with, wait for
	       * the next step to decide.
	       */
	      s.match_available = 1;
	      s.strstart++;
	      s.lookahead--;
	    }
	  }
	  //Assert (flush != Z_NO_FLUSH, "no flush?");
	  if (s.match_available) {
	    //Tracevv((stderr,"%c", s->window[s->strstart-1]));
	    /*** _tr_tally_lit(s, s.window[s.strstart-1], bflush); ***/
	    bflush = trees$1._tr_tally(s, 0, s.window[s.strstart - 1]);

	    s.match_available = 0;
	  }
	  s.insert = s.strstart < MIN_MATCH - 1 ? s.strstart : MIN_MATCH - 1;
	  if (flush === Z_FINISH) {
	    /*** FLUSH_BLOCK(s, 1); ***/
	    flush_block_only(s, true);
	    if (s.strm.avail_out === 0) {
	      return BS_FINISH_STARTED;
	    }
	    /***/
	    return BS_FINISH_DONE;
	  }
	  if (s.last_lit) {
	    /*** FLUSH_BLOCK(s, 0); ***/
	    flush_block_only(s, false);
	    if (s.strm.avail_out === 0) {
	      return BS_NEED_MORE;
	    }
	    /***/
	  }

	  return BS_BLOCK_DONE;
	}


	/* ===========================================================================
	 * For Z_RLE, simply look for runs of bytes, generate matches only of distance
	 * one.  Do not maintain a hash table.  (It will be regenerated if this run of
	 * deflate switches away from Z_RLE.)
	 */
	function deflate_rle(s, flush) {
	  var bflush;            /* set if current block must be flushed */
	  var prev;              /* byte at distance one to match */
	  var scan, strend;      /* scan goes up to strend for length of run */

	  var _win = s.window;

	  for (;;) {
	    /* Make sure that we always have enough lookahead, except
	     * at the end of the input file. We need MAX_MATCH bytes
	     * for the longest run, plus one for the unrolled loop.
	     */
	    if (s.lookahead <= MAX_MATCH) {
	      fill_window(s);
	      if (s.lookahead <= MAX_MATCH && flush === Z_NO_FLUSH) {
	        return BS_NEED_MORE;
	      }
	      if (s.lookahead === 0) { break; } /* flush the current block */
	    }

	    /* See how many times the previous byte repeats */
	    s.match_length = 0;
	    if (s.lookahead >= MIN_MATCH && s.strstart > 0) {
	      scan = s.strstart - 1;
	      prev = _win[scan];
	      if (prev === _win[++scan] && prev === _win[++scan] && prev === _win[++scan]) {
	        strend = s.strstart + MAX_MATCH;
	        do {
	          /*jshint noempty:false*/
	        } while (prev === _win[++scan] && prev === _win[++scan] &&
	                 prev === _win[++scan] && prev === _win[++scan] &&
	                 prev === _win[++scan] && prev === _win[++scan] &&
	                 prev === _win[++scan] && prev === _win[++scan] &&
	                 scan < strend);
	        s.match_length = MAX_MATCH - (strend - scan);
	        if (s.match_length > s.lookahead) {
	          s.match_length = s.lookahead;
	        }
	      }
	      //Assert(scan <= s->window+(uInt)(s->window_size-1), "wild scan");
	    }

	    /* Emit match if have run of MIN_MATCH or longer, else emit literal */
	    if (s.match_length >= MIN_MATCH) {
	      //check_match(s, s.strstart, s.strstart - 1, s.match_length);

	      /*** _tr_tally_dist(s, 1, s.match_length - MIN_MATCH, bflush); ***/
	      bflush = trees$1._tr_tally(s, 1, s.match_length - MIN_MATCH);

	      s.lookahead -= s.match_length;
	      s.strstart += s.match_length;
	      s.match_length = 0;
	    } else {
	      /* No match, output a literal byte */
	      //Tracevv((stderr,"%c", s->window[s->strstart]));
	      /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
	      bflush = trees$1._tr_tally(s, 0, s.window[s.strstart]);

	      s.lookahead--;
	      s.strstart++;
	    }
	    if (bflush) {
	      /*** FLUSH_BLOCK(s, 0); ***/
	      flush_block_only(s, false);
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	      /***/
	    }
	  }
	  s.insert = 0;
	  if (flush === Z_FINISH) {
	    /*** FLUSH_BLOCK(s, 1); ***/
	    flush_block_only(s, true);
	    if (s.strm.avail_out === 0) {
	      return BS_FINISH_STARTED;
	    }
	    /***/
	    return BS_FINISH_DONE;
	  }
	  if (s.last_lit) {
	    /*** FLUSH_BLOCK(s, 0); ***/
	    flush_block_only(s, false);
	    if (s.strm.avail_out === 0) {
	      return BS_NEED_MORE;
	    }
	    /***/
	  }
	  return BS_BLOCK_DONE;
	}

	/* ===========================================================================
	 * For Z_HUFFMAN_ONLY, do not look for matches.  Do not maintain a hash table.
	 * (It will be regenerated if this run of deflate switches away from Huffman.)
	 */
	function deflate_huff(s, flush) {
	  var bflush;             /* set if current block must be flushed */

	  for (;;) {
	    /* Make sure that we have a literal to write. */
	    if (s.lookahead === 0) {
	      fill_window(s);
	      if (s.lookahead === 0) {
	        if (flush === Z_NO_FLUSH) {
	          return BS_NEED_MORE;
	        }
	        break;      /* flush the current block */
	      }
	    }

	    /* Output a literal byte */
	    s.match_length = 0;
	    //Tracevv((stderr,"%c", s->window[s->strstart]));
	    /*** _tr_tally_lit(s, s.window[s.strstart], bflush); ***/
	    bflush = trees$1._tr_tally(s, 0, s.window[s.strstart]);
	    s.lookahead--;
	    s.strstart++;
	    if (bflush) {
	      /*** FLUSH_BLOCK(s, 0); ***/
	      flush_block_only(s, false);
	      if (s.strm.avail_out === 0) {
	        return BS_NEED_MORE;
	      }
	      /***/
	    }
	  }
	  s.insert = 0;
	  if (flush === Z_FINISH) {
	    /*** FLUSH_BLOCK(s, 1); ***/
	    flush_block_only(s, true);
	    if (s.strm.avail_out === 0) {
	      return BS_FINISH_STARTED;
	    }
	    /***/
	    return BS_FINISH_DONE;
	  }
	  if (s.last_lit) {
	    /*** FLUSH_BLOCK(s, 0); ***/
	    flush_block_only(s, false);
	    if (s.strm.avail_out === 0) {
	      return BS_NEED_MORE;
	    }
	    /***/
	  }
	  return BS_BLOCK_DONE;
	}

	/* Values for max_lazy_match, good_match and max_chain_length, depending on
	 * the desired pack level (0..9). The values given below have been tuned to
	 * exclude worst case performance for pathological files. Better values may be
	 * found for specific files.
	 */
	function Config(good_length, max_lazy, nice_length, max_chain, func) {
	  this.good_length = good_length;
	  this.max_lazy = max_lazy;
	  this.nice_length = nice_length;
	  this.max_chain = max_chain;
	  this.func = func;
	}

	var configuration_table;

	configuration_table = [
	  /*      good lazy nice chain */
	  new Config(0, 0, 0, 0, deflate_stored),          /* 0 store only */
	  new Config(4, 4, 8, 4, deflate_fast),            /* 1 max speed, no lazy matches */
	  new Config(4, 5, 16, 8, deflate_fast),           /* 2 */
	  new Config(4, 6, 32, 32, deflate_fast),          /* 3 */

	  new Config(4, 4, 16, 16, deflate_slow),          /* 4 lazy matches */
	  new Config(8, 16, 32, 32, deflate_slow),         /* 5 */
	  new Config(8, 16, 128, 128, deflate_slow),       /* 6 */
	  new Config(8, 32, 128, 256, deflate_slow),       /* 7 */
	  new Config(32, 128, 258, 1024, deflate_slow),    /* 8 */
	  new Config(32, 258, 258, 4096, deflate_slow)     /* 9 max compression */
	];


	/* ===========================================================================
	 * Initialize the "longest match" routines for a new zlib stream
	 */
	function lm_init(s) {
	  s.window_size = 2 * s.w_size;

	  /*** CLEAR_HASH(s); ***/
	  zero(s.head); // Fill with NIL (= 0);

	  /* Set the default configuration parameters:
	   */
	  s.max_lazy_match = configuration_table[s.level].max_lazy;
	  s.good_match = configuration_table[s.level].good_length;
	  s.nice_match = configuration_table[s.level].nice_length;
	  s.max_chain_length = configuration_table[s.level].max_chain;

	  s.strstart = 0;
	  s.block_start = 0;
	  s.lookahead = 0;
	  s.insert = 0;
	  s.match_length = s.prev_length = MIN_MATCH - 1;
	  s.match_available = 0;
	  s.ins_h = 0;
	}


	function DeflateState() {
	  this.strm = null;            /* pointer back to this zlib stream */
	  this.status = 0;            /* as the name implies */
	  this.pending_buf = null;      /* output still pending */
	  this.pending_buf_size = 0;  /* size of pending_buf */
	  this.pending_out = 0;       /* next pending byte to output to the stream */
	  this.pending = 0;           /* nb of bytes in the pending buffer */
	  this.wrap = 0;              /* bit 0 true for zlib, bit 1 true for gzip */
	  this.gzhead = null;         /* gzip header information to write */
	  this.gzindex = 0;           /* where in extra, name, or comment */
	  this.method = Z_DEFLATED; /* can only be DEFLATED */
	  this.last_flush = -1;   /* value of flush param for previous deflate call */

	  this.w_size = 0;  /* LZ77 window size (32K by default) */
	  this.w_bits = 0;  /* log2(w_size)  (8..16) */
	  this.w_mask = 0;  /* w_size - 1 */

	  this.window = null;
	  /* Sliding window. Input bytes are read into the second half of the window,
	   * and move to the first half later to keep a dictionary of at least wSize
	   * bytes. With this organization, matches are limited to a distance of
	   * wSize-MAX_MATCH bytes, but this ensures that IO is always
	   * performed with a length multiple of the block size.
	   */

	  this.window_size = 0;
	  /* Actual size of window: 2*wSize, except when the user input buffer
	   * is directly used as sliding window.
	   */

	  this.prev = null;
	  /* Link to older string with same hash index. To limit the size of this
	   * array to 64K, this link is maintained only for the last 32K strings.
	   * An index in this array is thus a window index modulo 32K.
	   */

	  this.head = null;   /* Heads of the hash chains or NIL. */

	  this.ins_h = 0;       /* hash index of string to be inserted */
	  this.hash_size = 0;   /* number of elements in hash table */
	  this.hash_bits = 0;   /* log2(hash_size) */
	  this.hash_mask = 0;   /* hash_size-1 */

	  this.hash_shift = 0;
	  /* Number of bits by which ins_h must be shifted at each input
	   * step. It must be such that after MIN_MATCH steps, the oldest
	   * byte no longer takes part in the hash key, that is:
	   *   hash_shift * MIN_MATCH >= hash_bits
	   */

	  this.block_start = 0;
	  /* Window position at the beginning of the current output block. Gets
	   * negative when the window is moved backwards.
	   */

	  this.match_length = 0;      /* length of best match */
	  this.prev_match = 0;        /* previous match */
	  this.match_available = 0;   /* set if previous match exists */
	  this.strstart = 0;          /* start of string to insert */
	  this.match_start = 0;       /* start of matching string */
	  this.lookahead = 0;         /* number of valid bytes ahead in window */

	  this.prev_length = 0;
	  /* Length of the best match at previous step. Matches not greater than this
	   * are discarded. This is used in the lazy match evaluation.
	   */

	  this.max_chain_length = 0;
	  /* To speed up deflation, hash chains are never searched beyond this
	   * length.  A higher limit improves compression ratio but degrades the
	   * speed.
	   */

	  this.max_lazy_match = 0;
	  /* Attempt to find a better match only when the current match is strictly
	   * smaller than this value. This mechanism is used only for compression
	   * levels >= 4.
	   */
	  // That's alias to max_lazy_match, don't use directly
	  //this.max_insert_length = 0;
	  /* Insert new strings in the hash table only if the match length is not
	   * greater than this length. This saves time but degrades compression.
	   * max_insert_length is used only for compression levels <= 3.
	   */

	  this.level = 0;     /* compression level (1..9) */
	  this.strategy = 0;  /* favor or force Huffman coding*/

	  this.good_match = 0;
	  /* Use a faster search when the previous match is longer than this */

	  this.nice_match = 0; /* Stop searching when current match exceeds this */

	              /* used by trees.c: */

	  /* Didn't use ct_data typedef below to suppress compiler warning */

	  // struct ct_data_s dyn_ltree[HEAP_SIZE];   /* literal and length tree */
	  // struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
	  // struct ct_data_s bl_tree[2*BL_CODES+1];  /* Huffman tree for bit lengths */

	  // Use flat array of DOUBLE size, with interleaved fata,
	  // because JS does not support effective
	  this.dyn_ltree  = new utils.Buf16(HEAP_SIZE * 2);
	  this.dyn_dtree  = new utils.Buf16((2 * D_CODES + 1) * 2);
	  this.bl_tree    = new utils.Buf16((2 * BL_CODES + 1) * 2);
	  zero(this.dyn_ltree);
	  zero(this.dyn_dtree);
	  zero(this.bl_tree);

	  this.l_desc   = null;         /* desc. for literal tree */
	  this.d_desc   = null;         /* desc. for distance tree */
	  this.bl_desc  = null;         /* desc. for bit length tree */

	  //ush bl_count[MAX_BITS+1];
	  this.bl_count = new utils.Buf16(MAX_BITS + 1);
	  /* number of codes at each bit length for an optimal tree */

	  //int heap[2*L_CODES+1];      /* heap used to build the Huffman trees */
	  this.heap = new utils.Buf16(2 * L_CODES + 1);  /* heap used to build the Huffman trees */
	  zero(this.heap);

	  this.heap_len = 0;               /* number of elements in the heap */
	  this.heap_max = 0;               /* element of largest frequency */
	  /* The sons of heap[n] are heap[2*n] and heap[2*n+1]. heap[0] is not used.
	   * The same heap array is used to build all trees.
	   */

	  this.depth = new utils.Buf16(2 * L_CODES + 1); //uch depth[2*L_CODES+1];
	  zero(this.depth);
	  /* Depth of each subtree used as tie breaker for trees of equal frequency
	   */

	  this.l_buf = 0;          /* buffer index for literals or lengths */

	  this.lit_bufsize = 0;
	  /* Size of match buffer for literals/lengths.  There are 4 reasons for
	   * limiting lit_bufsize to 64K:
	   *   - frequencies can be kept in 16 bit counters
	   *   - if compression is not successful for the first block, all input
	   *     data is still in the window so we can still emit a stored block even
	   *     when input comes from standard input.  (This can also be done for
	   *     all blocks if lit_bufsize is not greater than 32K.)
	   *   - if compression is not successful for a file smaller than 64K, we can
	   *     even emit a stored file instead of a stored block (saving 5 bytes).
	   *     This is applicable only for zip (not gzip or zlib).
	   *   - creating new Huffman trees less frequently may not provide fast
	   *     adaptation to changes in the input data statistics. (Take for
	   *     example a binary file with poorly compressible code followed by
	   *     a highly compressible string table.) Smaller buffer sizes give
	   *     fast adaptation but have of course the overhead of transmitting
	   *     trees more frequently.
	   *   - I can't count above 4
	   */

	  this.last_lit = 0;      /* running index in l_buf */

	  this.d_buf = 0;
	  /* Buffer index for distances. To simplify the code, d_buf and l_buf have
	   * the same number of elements. To use different lengths, an extra flag
	   * array would be necessary.
	   */

	  this.opt_len = 0;       /* bit length of current block with optimal trees */
	  this.static_len = 0;    /* bit length of current block with static trees */
	  this.matches = 0;       /* number of string matches in current block */
	  this.insert = 0;        /* bytes at end of window left to insert */


	  this.bi_buf = 0;
	  /* Output buffer. bits are inserted starting at the bottom (least
	   * significant bits).
	   */
	  this.bi_valid = 0;
	  /* Number of valid bits in bi_buf.  All bits above the last valid bit
	   * are always zero.
	   */

	  // Used for window memory init. We safely ignore it for JS. That makes
	  // sense only for pointers and memory check tools.
	  //this.high_water = 0;
	  /* High water mark offset in window for initialized bytes -- bytes above
	   * this are set to zero in order to avoid memory check warnings when
	   * longest match routines access bytes past the input.  This is then
	   * updated to the new high water mark.
	   */
	}


	function deflateResetKeep(strm) {
	  var s;

	  if (!strm || !strm.state) {
	    return err(strm, Z_STREAM_ERROR);
	  }

	  strm.total_in = strm.total_out = 0;
	  strm.data_type = Z_UNKNOWN;

	  s = strm.state;
	  s.pending = 0;
	  s.pending_out = 0;

	  if (s.wrap < 0) {
	    s.wrap = -s.wrap;
	    /* was made negative by deflate(..., Z_FINISH); */
	  }
	  s.status = (s.wrap ? INIT_STATE : BUSY_STATE);
	  strm.adler = (s.wrap === 2) ?
	    0  // crc32(0, Z_NULL, 0)
	  :
	    1; // adler32(0, Z_NULL, 0)
	  s.last_flush = Z_NO_FLUSH;
	  trees$1._tr_init(s);
	  return Z_OK;
	}


	function deflateReset(strm) {
	  var ret = deflateResetKeep(strm);
	  if (ret === Z_OK) {
	    lm_init(strm.state);
	  }
	  return ret;
	}


	function deflateSetHeader(strm, head) {
	  if (!strm || !strm.state) { return Z_STREAM_ERROR; }
	  if (strm.state.wrap !== 2) { return Z_STREAM_ERROR; }
	  strm.state.gzhead = head;
	  return Z_OK;
	}


	function deflateInit2(strm, level, method, windowBits, memLevel, strategy) {
	  if (!strm) { // === Z_NULL
	    return Z_STREAM_ERROR;
	  }
	  var wrap = 1;

	  if (level === Z_DEFAULT_COMPRESSION) {
	    level = 6;
	  }

	  if (windowBits < 0) { /* suppress zlib wrapper */
	    wrap = 0;
	    windowBits = -windowBits;
	  }

	  else if (windowBits > 15) {
	    wrap = 2;           /* write gzip wrapper instead */
	    windowBits -= 16;
	  }


	  if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method !== Z_DEFLATED ||
	    windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
	    strategy < 0 || strategy > Z_FIXED) {
	    return err(strm, Z_STREAM_ERROR);
	  }


	  if (windowBits === 8) {
	    windowBits = 9;
	  }
	  /* until 256-byte window bug fixed */

	  var s = new DeflateState();

	  strm.state = s;
	  s.strm = strm;

	  s.wrap = wrap;
	  s.gzhead = null;
	  s.w_bits = windowBits;
	  s.w_size = 1 << s.w_bits;
	  s.w_mask = s.w_size - 1;

	  s.hash_bits = memLevel + 7;
	  s.hash_size = 1 << s.hash_bits;
	  s.hash_mask = s.hash_size - 1;
	  s.hash_shift = ~~((s.hash_bits + MIN_MATCH - 1) / MIN_MATCH);

	  s.window = new utils.Buf8(s.w_size * 2);
	  s.head = new utils.Buf16(s.hash_size);
	  s.prev = new utils.Buf16(s.w_size);

	  // Don't need mem init magic for JS.
	  //s.high_water = 0;  /* nothing written to s->window yet */

	  s.lit_bufsize = 1 << (memLevel + 6); /* 16K elements by default */

	  s.pending_buf_size = s.lit_bufsize * 4;

	  //overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
	  //s->pending_buf = (uchf *) overlay;
	  s.pending_buf = new utils.Buf8(s.pending_buf_size);

	  // It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`)
	  //s->d_buf = overlay + s->lit_bufsize/sizeof(ush);
	  s.d_buf = 1 * s.lit_bufsize;

	  //s->l_buf = s->pending_buf + (1+sizeof(ush))*s->lit_bufsize;
	  s.l_buf = (1 + 2) * s.lit_bufsize;

	  s.level = level;
	  s.strategy = strategy;
	  s.method = method;

	  return deflateReset(strm);
	}

	function deflateInit(strm, level) {
	  return deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
	}


	function deflate$1(strm, flush) {
	  var old_flush, s;
	  var beg, val; // for gzip header write only

	  if (!strm || !strm.state ||
	    flush > Z_BLOCK || flush < 0) {
	    return strm ? err(strm, Z_STREAM_ERROR) : Z_STREAM_ERROR;
	  }

	  s = strm.state;

	  if (!strm.output ||
	      (!strm.input && strm.avail_in !== 0) ||
	      (s.status === FINISH_STATE && flush !== Z_FINISH)) {
	    return err(strm, (strm.avail_out === 0) ? Z_BUF_ERROR : Z_STREAM_ERROR);
	  }

	  s.strm = strm; /* just in case */
	  old_flush = s.last_flush;
	  s.last_flush = flush;

	  /* Write the header */
	  if (s.status === INIT_STATE) {

	    if (s.wrap === 2) { // GZIP header
	      strm.adler = 0;  //crc32(0L, Z_NULL, 0);
	      put_byte(s, 31);
	      put_byte(s, 139);
	      put_byte(s, 8);
	      if (!s.gzhead) { // s->gzhead == Z_NULL
	        put_byte(s, 0);
	        put_byte(s, 0);
	        put_byte(s, 0);
	        put_byte(s, 0);
	        put_byte(s, 0);
	        put_byte(s, s.level === 9 ? 2 :
	                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
	                     4 : 0));
	        put_byte(s, OS_CODE);
	        s.status = BUSY_STATE;
	      }
	      else {
	        put_byte(s, (s.gzhead.text ? 1 : 0) +
	                    (s.gzhead.hcrc ? 2 : 0) +
	                    (!s.gzhead.extra ? 0 : 4) +
	                    (!s.gzhead.name ? 0 : 8) +
	                    (!s.gzhead.comment ? 0 : 16)
	        );
	        put_byte(s, s.gzhead.time & 0xff);
	        put_byte(s, (s.gzhead.time >> 8) & 0xff);
	        put_byte(s, (s.gzhead.time >> 16) & 0xff);
	        put_byte(s, (s.gzhead.time >> 24) & 0xff);
	        put_byte(s, s.level === 9 ? 2 :
	                    (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2 ?
	                     4 : 0));
	        put_byte(s, s.gzhead.os & 0xff);
	        if (s.gzhead.extra && s.gzhead.extra.length) {
	          put_byte(s, s.gzhead.extra.length & 0xff);
	          put_byte(s, (s.gzhead.extra.length >> 8) & 0xff);
	        }
	        if (s.gzhead.hcrc) {
	          strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending, 0);
	        }
	        s.gzindex = 0;
	        s.status = EXTRA_STATE;
	      }
	    }
	    else // DEFLATE header
	    {
	      var header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8;
	      var level_flags = -1;

	      if (s.strategy >= Z_HUFFMAN_ONLY || s.level < 2) {
	        level_flags = 0;
	      } else if (s.level < 6) {
	        level_flags = 1;
	      } else if (s.level === 6) {
	        level_flags = 2;
	      } else {
	        level_flags = 3;
	      }
	      header |= (level_flags << 6);
	      if (s.strstart !== 0) { header |= PRESET_DICT; }
	      header += 31 - (header % 31);

	      s.status = BUSY_STATE;
	      putShortMSB(s, header);

	      /* Save the adler32 of the preset dictionary: */
	      if (s.strstart !== 0) {
	        putShortMSB(s, strm.adler >>> 16);
	        putShortMSB(s, strm.adler & 0xffff);
	      }
	      strm.adler = 1; // adler32(0L, Z_NULL, 0);
	    }
	  }

	//#ifdef GZIP
	  if (s.status === EXTRA_STATE) {
	    if (s.gzhead.extra/* != Z_NULL*/) {
	      beg = s.pending;  /* start of bytes to update crc */

	      while (s.gzindex < (s.gzhead.extra.length & 0xffff)) {
	        if (s.pending === s.pending_buf_size) {
	          if (s.gzhead.hcrc && s.pending > beg) {
	            strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	          }
	          flush_pending(strm);
	          beg = s.pending;
	          if (s.pending === s.pending_buf_size) {
	            break;
	          }
	        }
	        put_byte(s, s.gzhead.extra[s.gzindex] & 0xff);
	        s.gzindex++;
	      }
	      if (s.gzhead.hcrc && s.pending > beg) {
	        strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	      }
	      if (s.gzindex === s.gzhead.extra.length) {
	        s.gzindex = 0;
	        s.status = NAME_STATE;
	      }
	    }
	    else {
	      s.status = NAME_STATE;
	    }
	  }
	  if (s.status === NAME_STATE) {
	    if (s.gzhead.name/* != Z_NULL*/) {
	      beg = s.pending;  /* start of bytes to update crc */
	      //int val;

	      do {
	        if (s.pending === s.pending_buf_size) {
	          if (s.gzhead.hcrc && s.pending > beg) {
	            strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	          }
	          flush_pending(strm);
	          beg = s.pending;
	          if (s.pending === s.pending_buf_size) {
	            val = 1;
	            break;
	          }
	        }
	        // JS specific: little magic to add zero terminator to end of string
	        if (s.gzindex < s.gzhead.name.length) {
	          val = s.gzhead.name.charCodeAt(s.gzindex++) & 0xff;
	        } else {
	          val = 0;
	        }
	        put_byte(s, val);
	      } while (val !== 0);

	      if (s.gzhead.hcrc && s.pending > beg) {
	        strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	      }
	      if (val === 0) {
	        s.gzindex = 0;
	        s.status = COMMENT_STATE;
	      }
	    }
	    else {
	      s.status = COMMENT_STATE;
	    }
	  }
	  if (s.status === COMMENT_STATE) {
	    if (s.gzhead.comment/* != Z_NULL*/) {
	      beg = s.pending;  /* start of bytes to update crc */
	      //int val;

	      do {
	        if (s.pending === s.pending_buf_size) {
	          if (s.gzhead.hcrc && s.pending > beg) {
	            strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	          }
	          flush_pending(strm);
	          beg = s.pending;
	          if (s.pending === s.pending_buf_size) {
	            val = 1;
	            break;
	          }
	        }
	        // JS specific: little magic to add zero terminator to end of string
	        if (s.gzindex < s.gzhead.comment.length) {
	          val = s.gzhead.comment.charCodeAt(s.gzindex++) & 0xff;
	        } else {
	          val = 0;
	        }
	        put_byte(s, val);
	      } while (val !== 0);

	      if (s.gzhead.hcrc && s.pending > beg) {
	        strm.adler = crc32$1(strm.adler, s.pending_buf, s.pending - beg, beg);
	      }
	      if (val === 0) {
	        s.status = HCRC_STATE;
	      }
	    }
	    else {
	      s.status = HCRC_STATE;
	    }
	  }
	  if (s.status === HCRC_STATE) {
	    if (s.gzhead.hcrc) {
	      if (s.pending + 2 > s.pending_buf_size) {
	        flush_pending(strm);
	      }
	      if (s.pending + 2 <= s.pending_buf_size) {
	        put_byte(s, strm.adler & 0xff);
	        put_byte(s, (strm.adler >> 8) & 0xff);
	        strm.adler = 0; //crc32(0L, Z_NULL, 0);
	        s.status = BUSY_STATE;
	      }
	    }
	    else {
	      s.status = BUSY_STATE;
	    }
	  }
	//#endif

	  /* Flush as much pending output as possible */
	  if (s.pending !== 0) {
	    flush_pending(strm);
	    if (strm.avail_out === 0) {
	      /* Since avail_out is 0, deflate will be called again with
	       * more output space, but possibly with both pending and
	       * avail_in equal to zero. There won't be anything to do,
	       * but this is not an error situation so make sure we
	       * return OK instead of BUF_ERROR at next call of deflate:
	       */
	      s.last_flush = -1;
	      return Z_OK;
	    }

	    /* Make sure there is something to do and avoid duplicate consecutive
	     * flushes. For repeated and useless calls with Z_FINISH, we keep
	     * returning Z_STREAM_END instead of Z_BUF_ERROR.
	     */
	  } else if (strm.avail_in === 0 && rank(flush) <= rank(old_flush) &&
	    flush !== Z_FINISH) {
	    return err(strm, Z_BUF_ERROR);
	  }

	  /* User must not provide more input after the first FINISH: */
	  if (s.status === FINISH_STATE && strm.avail_in !== 0) {
	    return err(strm, Z_BUF_ERROR);
	  }

	  /* Start a new block or continue the current one.
	   */
	  if (strm.avail_in !== 0 || s.lookahead !== 0 ||
	    (flush !== Z_NO_FLUSH && s.status !== FINISH_STATE)) {
	    var bstate = (s.strategy === Z_HUFFMAN_ONLY) ? deflate_huff(s, flush) :
	      (s.strategy === Z_RLE ? deflate_rle(s, flush) :
	        configuration_table[s.level].func(s, flush));

	    if (bstate === BS_FINISH_STARTED || bstate === BS_FINISH_DONE) {
	      s.status = FINISH_STATE;
	    }
	    if (bstate === BS_NEED_MORE || bstate === BS_FINISH_STARTED) {
	      if (strm.avail_out === 0) {
	        s.last_flush = -1;
	        /* avoid BUF_ERROR next call, see above */
	      }
	      return Z_OK;
	      /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
	       * of deflate should use the same flush parameter to make sure
	       * that the flush is complete. So we don't have to output an
	       * empty block here, this will be done at next call. This also
	       * ensures that for a very small output buffer, we emit at most
	       * one empty block.
	       */
	    }
	    if (bstate === BS_BLOCK_DONE) {
	      if (flush === Z_PARTIAL_FLUSH) {
	        trees$1._tr_align(s);
	      }
	      else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */

	        trees$1._tr_stored_block(s, 0, 0, false);
	        /* For a full flush, this empty block will be recognized
	         * as a special marker by inflate_sync().
	         */
	        if (flush === Z_FULL_FLUSH) {
	          /*** CLEAR_HASH(s); ***/             /* forget history */
	          zero(s.head); // Fill with NIL (= 0);

	          if (s.lookahead === 0) {
	            s.strstart = 0;
	            s.block_start = 0;
	            s.insert = 0;
	          }
	        }
	      }
	      flush_pending(strm);
	      if (strm.avail_out === 0) {
	        s.last_flush = -1; /* avoid BUF_ERROR at next call, see above */
	        return Z_OK;
	      }
	    }
	  }
	  //Assert(strm->avail_out > 0, "bug2");
	  //if (strm.avail_out <= 0) { throw new Error("bug2");}

	  if (flush !== Z_FINISH) { return Z_OK; }
	  if (s.wrap <= 0) { return Z_STREAM_END; }

	  /* Write the trailer */
	  if (s.wrap === 2) {
	    put_byte(s, strm.adler & 0xff);
	    put_byte(s, (strm.adler >> 8) & 0xff);
	    put_byte(s, (strm.adler >> 16) & 0xff);
	    put_byte(s, (strm.adler >> 24) & 0xff);
	    put_byte(s, strm.total_in & 0xff);
	    put_byte(s, (strm.total_in >> 8) & 0xff);
	    put_byte(s, (strm.total_in >> 16) & 0xff);
	    put_byte(s, (strm.total_in >> 24) & 0xff);
	  }
	  else
	  {
	    putShortMSB(s, strm.adler >>> 16);
	    putShortMSB(s, strm.adler & 0xffff);
	  }

	  flush_pending(strm);
	  /* If avail_out is zero, the application will call deflate again
	   * to flush the rest.
	   */
	  if (s.wrap > 0) { s.wrap = -s.wrap; }
	  /* write the trailer only once! */
	  return s.pending !== 0 ? Z_OK : Z_STREAM_END;
	}

	function deflateEnd(strm) {
	  var status;

	  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
	    return Z_STREAM_ERROR;
	  }

	  status = strm.state.status;
	  if (status !== INIT_STATE &&
	    status !== EXTRA_STATE &&
	    status !== NAME_STATE &&
	    status !== COMMENT_STATE &&
	    status !== HCRC_STATE &&
	    status !== BUSY_STATE &&
	    status !== FINISH_STATE
	  ) {
	    return err(strm, Z_STREAM_ERROR);
	  }

	  strm.state = null;

	  return status === BUSY_STATE ? err(strm, Z_DATA_ERROR) : Z_OK;
	}


	/* =========================================================================
	 * Initializes the compression dictionary from the given byte
	 * sequence without producing any compressed output.
	 */
	function deflateSetDictionary(strm, dictionary) {
	  var dictLength = dictionary.length;

	  var s;
	  var str, n;
	  var wrap;
	  var avail;
	  var next;
	  var input;
	  var tmpDict;

	  if (!strm/*== Z_NULL*/ || !strm.state/*== Z_NULL*/) {
	    return Z_STREAM_ERROR;
	  }

	  s = strm.state;
	  wrap = s.wrap;

	  if (wrap === 2 || (wrap === 1 && s.status !== INIT_STATE) || s.lookahead) {
	    return Z_STREAM_ERROR;
	  }

	  /* when using zlib wrappers, compute Adler-32 for provided dictionary */
	  if (wrap === 1) {
	    /* adler32(strm->adler, dictionary, dictLength); */
	    strm.adler = adler32$1(strm.adler, dictionary, dictLength, 0);
	  }

	  s.wrap = 0;   /* avoid computing Adler-32 in read_buf */

	  /* if dictionary would fill window, just replace the history */
	  if (dictLength >= s.w_size) {
	    if (wrap === 0) {            /* already empty otherwise */
	      /*** CLEAR_HASH(s); ***/
	      zero(s.head); // Fill with NIL (= 0);
	      s.strstart = 0;
	      s.block_start = 0;
	      s.insert = 0;
	    }
	    /* use the tail */
	    // dictionary = dictionary.slice(dictLength - s.w_size);
	    tmpDict = new utils.Buf8(s.w_size);
	    utils.arraySet(tmpDict, dictionary, dictLength - s.w_size, s.w_size, 0);
	    dictionary = tmpDict;
	    dictLength = s.w_size;
	  }
	  /* insert dictionary into window and hash */
	  avail = strm.avail_in;
	  next = strm.next_in;
	  input = strm.input;
	  strm.avail_in = dictLength;
	  strm.next_in = 0;
	  strm.input = dictionary;
	  fill_window(s);
	  while (s.lookahead >= MIN_MATCH) {
	    str = s.strstart;
	    n = s.lookahead - (MIN_MATCH - 1);
	    do {
	      /* UPDATE_HASH(s, s->ins_h, s->window[str + MIN_MATCH-1]); */
	      s.ins_h = ((s.ins_h << s.hash_shift) ^ s.window[str + MIN_MATCH - 1]) & s.hash_mask;

	      s.prev[str & s.w_mask] = s.head[s.ins_h];

	      s.head[s.ins_h] = str;
	      str++;
	    } while (--n);
	    s.strstart = str;
	    s.lookahead = MIN_MATCH - 1;
	    fill_window(s);
	  }
	  s.strstart += s.lookahead;
	  s.block_start = s.strstart;
	  s.insert = s.lookahead;
	  s.lookahead = 0;
	  s.match_length = s.prev_length = MIN_MATCH - 1;
	  s.match_available = 0;
	  strm.next_in = next;
	  strm.input = input;
	  strm.avail_in = avail;
	  s.wrap = wrap;
	  return Z_OK;
	}


	deflate.__exports.deflateInit = deflateInit;
	deflate.__exports.deflateInit2 = deflateInit2;
	deflate.__exports.deflateReset = deflateReset;
	deflate.__exports.deflateResetKeep = deflateResetKeep;
	deflate.__exports.deflateSetHeader = deflateSetHeader;
	deflate.__exports.deflate = deflate$1;
	deflate.__exports.deflateEnd = deflateEnd;
	deflate.__exports.deflateSetDictionary = deflateSetDictionary;
	deflate.__exports.deflateInfo = 'pako deflate (from Nodeca project)';

	/* Not implemented
	exports.deflateBound = deflateBound;
	exports.deflateCopy = deflateCopy;
	exports.deflateParams = deflateParams;
	exports.deflatePending = deflatePending;
	exports.deflatePrime = deflatePrime;
	exports.deflateTune = deflateTune;
	*/
	return deflate.__exports;
}

exports.__require = requireDeflate;
