'use strict';

// (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.

const { _tr_init, _tr_stored_block, _tr_flush_block, _tr_tally, _tr_align } = require('./trees');
const adler32 = require('./adler32');
const crc32   = require('./crc32');
const msg     = require('./messages');

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

const {
  Z_NO_FLUSH, Z_PARTIAL_FLUSH, Z_FULL_FLUSH, Z_FINISH, Z_BLOCK,
  Z_OK, Z_STREAM_END, Z_STREAM_ERROR, Z_DATA_ERROR, Z_BUF_ERROR,
  Z_DEFAULT_COMPRESSION,
  Z_FILTERED, Z_HUFFMAN_ONLY, Z_RLE, Z_FIXED, Z_DEFAULT_STRATEGY,
  Z_UNKNOWN,
  Z_DEFLATED
} = require('./constants');

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


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


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

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

const PRESET_DICT = 0x20;

const INIT_STATE    =  42;    /* zlib header -> BUSY_STATE */
//#ifdef GZIP
const GZIP_STATE    =  57;    /* gzip header -> BUSY_STATE | EXTRA_STATE */
//#endif
const EXTRA_STATE   =  69;    /* gzip extra block -> NAME_STATE */
const NAME_STATE    =  73;    /* gzip file name -> COMMENT_STATE */
const COMMENT_STATE =  91;    /* gzip comment -> HCRC_STATE */
const HCRC_STATE    = 103;    /* gzip header CRC -> BUSY_STATE */
const BUSY_STATE    = 113;    /* deflate -> FINISH_STATE */
const FINISH_STATE  = 666;    /* stream complete */

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

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

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

const rank = (f) => {
  return ((f) * 2) - ((f) > 4 ? 9 : 0);
};

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

/* ===========================================================================
 * Slide the hash table when sliding the window down (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.
 */
const slide_hash = (s) => {
  let n, m;
  let p;
  let wsize = s.w_size;

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

/* eslint-disable new-cap */
let HASH = (s, prev, data) => ((prev << s.hash_shift) ^ data) & s.hash_mask;


/* ===========================================================================
 * Insert string str in the dictionary and set match_head to the previous head
 * of the hash chain (the most recent string with same hash key). Return
 * the previous length of the hash chain.
 * IN  assertion: all calls to INSERT_STRING are made with consecutive input
 *    characters and the first MIN_MATCH bytes of str are valid (except for
 *    the last MIN_MATCH-1 bytes of the input file).
 */
const INSERT_STRING = (s, str) => {
  let h;
  if (s.legacy_hash) {
    /* UPDATE_HASH(s, s->ins_h, s->window[(str) + (MIN_MATCH-1)]); */
    h = s.ins_h = HASH(s, s.ins_h, s.window[str + MIN_MATCH - 1]);
  } else {
    // ANZAC++ hash: reads 4 bytes, matches node.js zlib output (legacyHash
    // restores classic zlib hash). Faster, with fewer collisions.
    const w = s.window;
    // Read 4 bytes little-endian. Math.imul reproduces C uint32 overflow in
    // `(value * 66521 + 66521) >> 16` exactly.
    const value = w[str] | (w[str + 1] << 8) | (w[str + 2] << 16) | (w[str + 3] << 24);
    h = s.ins_h = ((Math.imul(value, 66521) + 66521) >>> 16) & s.hash_mask;
  }
  const hash_head = s.prev[str & s.w_mask] = s.head[h];
  s.head[h] = str;
  return hash_head;
};


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

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

  strm.output.set(s.pending_buf.subarray(s.pending_out, 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;
  }
};


const flush_block_only = (s, last) => {
  _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);
};


const 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.
 */
const 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()).
 */
const read_buf = (strm, buf, start, size) => {

  let len = strm.avail_in;

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

  strm.avail_in -= len;

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

  else if (strm.state.wrap === 2) {
    strm.adler = crc32(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.
 */
const longest_match = (s, cur_match) => {

  let chain_length = s.max_chain_length;      /* max hash chain length */
  let scan = s.strstart; /* current string */
  let match;                       /* matched string */
  let len;                           /* length of current match */
  let best_len = s.prev_length;              /* best match length so far */
  let nice_match = s.nice_match;             /* stop if match long enough */
  const limit = (s.strstart > (s.w_size - MIN_LOOKAHEAD)) ?
      s.strstart - (s.w_size - MIN_LOOKAHEAD) : 0/*NIL*/;

  const _win = s.window; // shortcut

  const wmask = s.w_mask;
  const prev  = s.prev;

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

  const strend = s.strstart + MAX_MATCH;
  let scan_end1  = _win[scan + best_len - 1];
  let 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).
 */
const fill_window = (s) => {

  const _w_size = s.w_size;
  let n, 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)) {

      s.window.set(s.window.subarray(_w_size, _w_size + _w_size - more), 0);
      s.match_start -= _w_size;
      s.strstart -= _w_size;
      /* we now have strstart >= MAX_DIST */
      s.block_start -= _w_size;
      if (s.insert > s.strstart) {
        s.insert = s.strstart;
      }
      slide_hash(s);
      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.legacy_hash) {
      /* The 4-byte hash reads one extra byte, so it needs one more available. */
      if (s.lookahead + s.insert > MIN_MATCH) {
        str = s.strstart - s.insert;
        while (s.insert) {
          INSERT_STRING(s, str);
          str++;
          s.insert--;
          if (s.lookahead + s.insert <= MIN_MATCH) {
            break;
          }
        }
      }
    } else 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 = HASH(s, s.ins_h, s.window[str + 1]);
//#if MIN_MATCH != 3
//        Call update_hash() MIN_MATCH-3 more times
//#endif
      while (s.insert) {
        INSERT_STRING(s, 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) {
//    const curr = s.strstart + s.lookahead;
//    let 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.
 *
 * In case deflateParams() is used to later switch to a non-zero compression
 * level, s->matches (otherwise unused when storing) keeps track of the number
 * of hash table slides to perform. If s->matches is 1, then one hash table
 * slide will be done when switching. If s->matches is 2, the maximum value
 * allowed here, then the hash table will be cleared, since two or more slides
 * is the same as a clear.
 *
 * deflate_stored() is written to minimize the number of times an input byte is
 * copied. It is most efficient with large input and output buffers, which
 * maximizes the opportunites to have a single copy from next_in to next_out.
 */
const deflate_stored = (s, flush) => {

  /* Smallest worthy block size when not flushing or finishing. By default
   * this is 32K. This can be as small as 507 bytes for memLevel == 1. For
   * large input and output buffers, the stored block size will be larger.
   */
  let min_block = s.pending_buf_size - 5 > s.w_size ? s.w_size : s.pending_buf_size - 5;

  /* Copy as many min_block or larger stored blocks directly to next_out as
   * possible. If flushing, copy the remaining available input to next_out as
   * stored blocks, if there is enough space.
   */
  let len, left, have, last = 0;
  let used = s.strm.avail_in;
  do {
    /* Set len to the maximum size block that we can copy directly with the
     * available input data and output space. Set left to how much of that
     * would be copied from what's left in the window.
     */
    len = 65535/* MAX_STORED */;     /* maximum deflate stored block length */
    have = (s.bi_valid + 42) >> 3;     /* number of header bytes */
    if (s.strm.avail_out < have) {         /* need room for header */
      break;
    }
      /* maximum stored block length that will fit in avail_out: */
    have = s.strm.avail_out - have;
    left = s.strstart - s.block_start;  /* bytes left in window */
    if (len > left + s.strm.avail_in) {
      len = left + s.strm.avail_in;   /* limit len to the input */
    }
    if (len > have) {
      len = have;             /* limit len to the output */
    }

    /* If the stored block would be less than min_block in length, or if
     * unable to copy all of the available input when flushing, then try
     * copying to the window and the pending buffer instead. Also don't
     * write an empty block when flushing -- deflate() does that.
     */
    if (len < min_block && ((len === 0 && flush !== Z_FINISH) ||
                        flush === Z_NO_FLUSH ||
                        len !== left + s.strm.avail_in)) {
      break;
    }

    /* Make a dummy stored block in pending to get the header bytes,
     * including any pending bits. This also updates the debugging counts.
     */
    last = flush === Z_FINISH && len === left + s.strm.avail_in ? 1 : 0;
    _tr_stored_block(s, 0, 0, last);

    /* Replace the lengths in the dummy stored block with len. */
    s.pending_buf[s.pending - 4] = len;
    s.pending_buf[s.pending - 3] = len >> 8;
    s.pending_buf[s.pending - 2] = ~len;
    s.pending_buf[s.pending - 1] = ~len >> 8;

    /* Write the stored block header bytes. */
    flush_pending(s.strm);

//#ifdef ZLIB_DEBUG
//    /* Update debugging counts for the data about to be copied. */
//    s->compressed_len += len << 3;
//    s->bits_sent += len << 3;
//#endif

    /* Copy uncompressed bytes from the window to next_out. */
    if (left) {
      if (left > len) {
        left = len;
      }
      //zmemcpy(s->strm->next_out, s->window + s->block_start, left);
      s.strm.output.set(s.window.subarray(s.block_start, s.block_start + left), s.strm.next_out);
      s.strm.next_out += left;
      s.strm.avail_out -= left;
      s.strm.total_out += left;
      s.block_start += left;
      len -= left;
    }

    /* Copy uncompressed bytes directly from next_in to next_out, updating
     * the check value.
     */
    if (len) {
      read_buf(s.strm, s.strm.output, s.strm.next_out, len);
      s.strm.next_out += len;
      s.strm.avail_out -= len;
      s.strm.total_out += len;
    }
  } while (last === 0);

  /* Update the sliding window with the last s->w_size bytes of the copied
   * data, or append all of the copied data to the existing window if less
   * than s->w_size bytes were copied. Also update the number of bytes to
   * insert in the hash tables, in the event that deflateParams() switches to
   * a non-zero compression level.
   */
  used -= s.strm.avail_in;    /* number of input bytes directly copied */
  if (used) {
    /* If any input was used, then no unused input remains in the window,
     * therefore s->block_start == s->strstart.
     */
    if (used >= s.w_size) {  /* supplant the previous history */
      s.matches = 2;     /* clear hash */
      //zmemcpy(s->window, s->strm->next_in - s->w_size, s->w_size);
      s.window.set(s.strm.input.subarray(s.strm.next_in - s.w_size, s.strm.next_in), 0);
      s.strstart = s.w_size;
      s.insert = s.strstart;
    }
    else {
      if (s.window_size - s.strstart <= used) {
        /* Slide the window down. */
        s.strstart -= s.w_size;
        //zmemcpy(s->window, s->window + s->w_size, s->strstart);
        s.window.set(s.window.subarray(s.w_size, s.w_size + s.strstart), 0);
        if (s.matches < 2) {
          s.matches++;   /* add a pending slide_hash() */
        }
        if (s.insert > s.strstart) {
          s.insert = s.strstart;
        }
      }
      //zmemcpy(s->window + s->strstart, s->strm->next_in - used, used);
      s.window.set(s.strm.input.subarray(s.strm.next_in - used, s.strm.next_in), s.strstart);
      s.strstart += used;
      s.insert += used > s.w_size - s.insert ? s.w_size - s.insert : used;
    }
    s.block_start = s.strstart;
  }
  if (s.high_water < s.strstart) {
    s.high_water = s.strstart;
  }

  /* If the last block was written to next_out, then done. */
  if (last) {
    return BS_FINISH_DONE;
  }

  /* If flushing and all input has been consumed, then done. */
  if (flush !== Z_NO_FLUSH && flush !== Z_FINISH &&
    s.strm.avail_in === 0 && s.strstart === s.block_start) {
    return BS_BLOCK_DONE;
  }

  /* Fill the window with any remaining input. */
  have = s.window_size - s.strstart;
  if (s.strm.avail_in > have && s.block_start >= s.w_size) {
    /* Slide the window down. */
    s.block_start -= s.w_size;
    s.strstart -= s.w_size;
    //zmemcpy(s->window, s->window + s->w_size, s->strstart);
    s.window.set(s.window.subarray(s.w_size, s.w_size + s.strstart), 0);
    if (s.matches < 2) {
      s.matches++;       /* add a pending slide_hash() */
    }
    have += s.w_size;      /* more space now */
    if (s.insert > s.strstart) {
      s.insert = s.strstart;
    }
  }
  if (have > s.strm.avail_in) {
    have = s.strm.avail_in;
  }
  if (have) {
    read_buf(s.strm, s.window, s.strstart, have);
    s.strstart += have;
    s.insert += have > s.w_size - s.insert ? s.w_size - s.insert : have;
  }
  if (s.high_water < s.strstart) {
    s.high_water = s.strstart;
  }

  /* There was not enough avail_out to write a complete worthy or flushed
   * stored block to next_out. Write a stored block to pending instead, if we
   * have enough input for a worthy block, or if flushing and there is enough
   * room for the remaining input as a stored block in the pending buffer.
   */
  have = (s.bi_valid + 42) >> 3;     /* number of header bytes */
    /* maximum stored block length that will fit in pending: */
  have = s.pending_buf_size - have > 65535/* MAX_STORED */ ? 65535/* MAX_STORED */ : s.pending_buf_size - have;
  min_block = have > s.w_size ? s.w_size : have;
  left = s.strstart - s.block_start;
  if (left >= min_block ||
     ((left || flush === Z_FINISH) && flush !== Z_NO_FLUSH &&
     s.strm.avail_in === 0 && left <= have)) {
    len = left > have ? have : left;
    last = flush === Z_FINISH && s.strm.avail_in === 0 &&
         len === left ? 1 : 0;
    _tr_stored_block(s, s.block_start, len, last);
    s.block_start += len;
    flush_pending(s.strm);
  }

  /* We've done all we can with the available input and output. */
  return last ? BS_FINISH_STARTED : 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.
 */
const deflate_fast = (s, flush) => {

  let hash_head;        /* head of the hash chain */
  let 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) {
      hash_head = INSERT_STRING(s, 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 = _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++;
          hash_head = INSERT_STRING(s, 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;
        if (s.legacy_hash) {
          s.ins_h = s.window[s.strstart];
          /* UPDATE_HASH(s, s.ins_h, s.window[s.strstart+1]); */
          s.ins_h = HASH(s, s.ins_h, s.window[s.strstart + 1]);

//#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 = _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.sym_next) {
    /*** 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.
 */
const deflate_slow = (s, flush) => {

  let hash_head;          /* head of hash chain */
  let bflush;              /* set if current block must be flushed */

  let 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) {
      hash_head = INSERT_STRING(s, 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 = _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) {
          hash_head = INSERT_STRING(s, 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 = _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 = _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.sym_next) {
    /*** 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.)
 */
const deflate_rle = (s, flush) => {

  let bflush;            /* set if current block must be flushed */
  let prev;              /* byte at distance one to match */
  let scan, strend;      /* scan goes up to strend for length of run */

  const _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 = _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 = _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.sym_next) {
    /*** 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.)
 */
const deflate_huff = (s, flush) => {

  let 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 = _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.sym_next) {
    /*** 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;
}

const 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
 */
const 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.legacy_hash = 0; /* use classic zlib hash instead of default ANZAC++ */
  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 Uint16Array(HEAP_SIZE * 2);
  this.dyn_dtree  = new Uint16Array((2 * D_CODES + 1) * 2);
  this.bl_tree    = new Uint16Array((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 Uint16Array(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 Uint16Array(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 Uint16Array(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.sym_buf = 0;        /* buffer for distances and literals/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.sym_next = 0;      /* running index in sym_buf */
  this.sym_end = 0;       /* symbol table full when sym_next reaches this */

  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.
   */
}


/* =========================================================================
 * Check for a valid deflate stream state. Return 0 if ok, 1 if not.
 */
const deflateStateCheck = (strm) => {

  if (!strm) {
    return 1;
  }
  const s = strm.state;
  if (!s || s.strm !== strm || (s.status !== INIT_STATE &&
//#ifdef GZIP
                                s.status !== GZIP_STATE &&
//#endif
                                s.status !== EXTRA_STATE &&
                                s.status !== NAME_STATE &&
                                s.status !== COMMENT_STATE &&
                                s.status !== HCRC_STATE &&
                                s.status !== BUSY_STATE &&
                                s.status !== FINISH_STATE)) {
    return 1;
  }
  return 0;
};


const deflateResetKeep = (strm) => {

  if (deflateStateCheck(strm)) {
    return err(strm, Z_STREAM_ERROR);
  }

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

  const 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 =
//#ifdef GZIP
    s.wrap === 2 ? GZIP_STATE :
//#endif
    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 = -2;
  _tr_init(s);
  return Z_OK;
};


const deflateReset = (strm) => {

  const ret = deflateResetKeep(strm);
  if (ret === Z_OK) {
    lm_init(strm.state);
  }
  return ret;
};


const deflateSetHeader = (strm, head) => {

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


const deflateInit2 = (strm, level, method, windowBits, memLevel, strategy, legacyHash) => {

  if (!strm) { // === Z_NULL
    return Z_STREAM_ERROR;
  }
  let 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 || (windowBits === 8 && wrap !== 1)) {
    return err(strm, Z_STREAM_ERROR);
  }


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

  const s = new DeflateState();

  strm.state = s;
  s.strm = strm;
  s.status = INIT_STATE;     /* to pass state test in deflateReset() */

  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.legacy_hash = legacyHash ? 1 : 0;

  s.hash_bits = memLevel + 7;
  /* ANZAC++ hash needs >= 15 hash bits to span its 4 read bytes. */
  if (!s.legacy_hash && s.hash_bits < 15) {
    s.hash_bits = 15;
  }
  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 Uint8Array(s.w_size * 2);
  s.head = new Uint16Array(s.hash_size);
  s.prev = new Uint16Array(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 */

  /* We overlay pending_buf and sym_buf. This works since the average size
   * for length/distance pairs over any compressed block is assured to be 31
   * bits or less.
   *
   * Analysis: The longest fixed codes are a length code of 8 bits plus 5
   * extra bits, for lengths 131 to 257. The longest fixed distance codes are
   * 5 bits plus 13 extra bits, for distances 16385 to 32768. The longest
   * possible fixed-codes length/distance pair is then 31 bits total.
   *
   * sym_buf starts one-fourth of the way into pending_buf. So there are
   * three bytes in sym_buf for every four bytes in pending_buf. Each symbol
   * in sym_buf is three bytes -- two for the distance and one for the
   * literal/length. As each symbol is consumed, the pointer to the next
   * sym_buf value to read moves forward three bytes. From that symbol, up to
   * 31 bits are written to pending_buf. The closest the written pending_buf
   * bits gets to the next sym_buf symbol to read is just before the last
   * code is written. At that time, 31*(n-2) bits have been written, just
   * after 24*(n-2) bits have been consumed from sym_buf. sym_buf starts at
   * 8*n bits into pending_buf. (Note that the symbol buffer fills when n-1
   * symbols are written.) The closest the writing gets to what is unread is
   * then n+14 bits. Here n is lit_bufsize, which is 16384 by default, and
   * can range from 128 to 32768.
   *
   * Therefore, at a minimum, there are 142 bits of space between what is
   * written and what is read in the overlain buffers, so the symbols cannot
   * be overwritten by the compressed data. That space is actually 139 bits,
   * due to the three-bit fixed-code block header.
   *
   * That covers the case where either Z_FIXED is specified, forcing fixed
   * codes, or when the use of fixed codes is chosen, because that choice
   * results in a smaller compressed block than dynamic codes. That latter
   * condition then assures that the above analysis also covers all dynamic
   * blocks. A dynamic-code block will only be chosen to be emitted if it has
   * fewer bits than a fixed-code block would for the same set of symbols.
   * Therefore its average symbol length is assured to be less than 31. So
   * the compressed data for a dynamic block also cannot overwrite the
   * symbols from which it is being constructed.
   */

  s.pending_buf_size = s.lit_bufsize * 4;
  s.pending_buf = new Uint8Array(s.pending_buf_size);

  // It is offset from `s.pending_buf` (size is `s.lit_bufsize * 2`)
  //s->sym_buf = s->pending_buf + s->lit_bufsize;
  s.sym_buf = s.lit_bufsize;

  //s->sym_end = (s->lit_bufsize - 1) * 3;
  s.sym_end = (s.lit_bufsize - 1) * 3;
  /* We avoid equality with lit_bufsize*3 because of wraparound at 64K
   * on 16 bit machines and because stored blocks are restricted to
   * 64K-1 bytes.
   */

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

  return deflateReset(strm);
};

const deflateInit = (strm, level) => {

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


/* ========================================================================= */
const deflate = (strm, flush) => {

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

  const s = strm.state;

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

  const old_flush = s.last_flush;
  s.last_flush = flush;

  /* 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);
  }

  /* Write the header */
  if (s.status === INIT_STATE && s.wrap === 0) {
    s.status = BUSY_STATE;
  }
  if (s.status === INIT_STATE) {
    /* zlib header */
    let header = (Z_DEFLATED + ((s.w_bits - 8) << 4)) << 8;
    let 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);

    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);
    s.status = BUSY_STATE;

    /* Compression must start with an empty pending buffer */
    flush_pending(strm);
    if (s.pending !== 0) {
      s.last_flush = -1;
      return Z_OK;
    }
  }
//#ifdef GZIP
  if (s.status === GZIP_STATE) {
    /* 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;

      /* Compression must start with an empty pending buffer */
      flush_pending(strm);
      if (s.pending !== 0) {
        s.last_flush = -1;
        return Z_OK;
      }
    }
    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(strm.adler, s.pending_buf, s.pending, 0);
      }
      s.gzindex = 0;
      s.status = EXTRA_STATE;
    }
  }
  if (s.status === EXTRA_STATE) {
    if (s.gzhead.extra/* != Z_NULL*/) {
      let beg = s.pending;   /* start of bytes to update crc */
      let left = (s.gzhead.extra.length & 0xffff) - s.gzindex;
      while (s.pending + left > s.pending_buf_size) {
        let copy = s.pending_buf_size - s.pending;
        // zmemcpy(s.pending_buf + s.pending,
        //    s.gzhead.extra + s.gzindex, copy);
        s.pending_buf.set(s.gzhead.extra.subarray(s.gzindex, s.gzindex + copy), s.pending);
        s.pending = s.pending_buf_size;
        //--- HCRC_UPDATE(beg) ---//
        if (s.gzhead.hcrc && s.pending > beg) {
          strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
        }
        //---//
        s.gzindex += copy;
        flush_pending(strm);
        if (s.pending !== 0) {
          s.last_flush = -1;
          return Z_OK;
        }
        beg = 0;
        left -= copy;
      }
      // JS specific: s.gzhead.extra may be TypedArray or Array for backward compatibility
      //              TypedArray.slice and TypedArray.from don't exist in IE10-IE11
      let gzhead_extra = new Uint8Array(s.gzhead.extra);
      // zmemcpy(s->pending_buf + s->pending,
      //     s->gzhead->extra + s->gzindex, left);
      s.pending_buf.set(gzhead_extra.subarray(s.gzindex, s.gzindex + left), s.pending);
      s.pending += left;
      //--- HCRC_UPDATE(beg) ---//
      if (s.gzhead.hcrc && s.pending > beg) {
        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
      }
      //---//
      s.gzindex = 0;
    }
    s.status = NAME_STATE;
  }
  if (s.status === NAME_STATE) {
    if (s.gzhead.name/* != Z_NULL*/) {
      let beg = s.pending;   /* start of bytes to update crc */
      let val;
      do {
        if (s.pending === s.pending_buf_size) {
          //--- HCRC_UPDATE(beg) ---//
          if (s.gzhead.hcrc && s.pending > beg) {
            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
          }
          //---//
          flush_pending(strm);
          if (s.pending !== 0) {
            s.last_flush = -1;
            return Z_OK;
          }
          beg = 0;
        }
        // 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);
      //--- HCRC_UPDATE(beg) ---//
      if (s.gzhead.hcrc && s.pending > beg) {
        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
      }
      //---//
      s.gzindex = 0;
    }
    s.status = COMMENT_STATE;
  }
  if (s.status === COMMENT_STATE) {
    if (s.gzhead.comment/* != Z_NULL*/) {
      let beg = s.pending;   /* start of bytes to update crc */
      let val;
      do {
        if (s.pending === s.pending_buf_size) {
          //--- HCRC_UPDATE(beg) ---//
          if (s.gzhead.hcrc && s.pending > beg) {
            strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
          }
          //---//
          flush_pending(strm);
          if (s.pending !== 0) {
            s.last_flush = -1;
            return Z_OK;
          }
          beg = 0;
        }
        // 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);
      //--- HCRC_UPDATE(beg) ---//
      if (s.gzhead.hcrc && s.pending > beg) {
        strm.adler = crc32(strm.adler, s.pending_buf, s.pending - beg, beg);
      }
      //---//
    }
    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 !== 0) {
          s.last_flush = -1;
          return Z_OK;
        }
      }
      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;

    /* Compression must start with an empty pending buffer */
    flush_pending(strm);
    if (s.pending !== 0) {
      s.last_flush = -1;
      return Z_OK;
    }
  }
//#endif

  /* 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)) {
    let bstate = s.level === 0 ? deflate_stored(s, flush) :
                 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) {
        _tr_align(s);
      }
      else if (flush !== Z_BLOCK) { /* FULL_FLUSH or SYNC_FLUSH */

        _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;
      }
    }
  }

  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;
};


const deflateEnd = (strm) => {

  if (deflateStateCheck(strm)) {
    return Z_STREAM_ERROR;
  }

  const status = strm.state.status;

  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.
 */
const deflateSetDictionary = (strm, dictionary) => {

  let dictLength = dictionary.length;

  if (deflateStateCheck(strm)) {
    return Z_STREAM_ERROR;
  }

  const s = strm.state;
  const 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(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);
    let tmpDict = new Uint8Array(s.w_size);
    tmpDict.set(dictionary.subarray(dictLength - s.w_size, dictLength), 0);
    dictionary = tmpDict;
    dictLength = s.w_size;
  }
  /* insert dictionary into window and hash */
  const avail = strm.avail_in;
  const next = strm.next_in;
  const input = strm.input;
  strm.avail_in = dictLength;
  strm.next_in = 0;
  strm.input = dictionary;
  fill_window(s);
  while (s.lookahead >= MIN_MATCH) {
    let str = s.strstart;
    let n = s.lookahead - (MIN_MATCH - 1);
    do {
      INSERT_STRING(s, 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;
};


module.exports.deflateInit = deflateInit;
module.exports.deflateInit2 = deflateInit2;
module.exports.deflateReset = deflateReset;
module.exports.deflateResetKeep = deflateResetKeep;
module.exports.deflateSetHeader = deflateSetHeader;
module.exports.deflate = deflate;
module.exports.deflateEnd = deflateEnd;
module.exports.deflateSetDictionary = deflateSetDictionary;
module.exports.deflateInfo = 'pako deflate (from Nodeca project)';

/* Not implemented
module.exports.deflateBound = deflateBound;
module.exports.deflateCopy = deflateCopy;
module.exports.deflateGetDictionary = deflateGetDictionary;
module.exports.deflateParams = deflateParams;
module.exports.deflatePending = deflatePending;
module.exports.deflatePrime = deflatePrime;
module.exports.deflateTune = deflateTune;
*/
