code: function ZStream() {
    /* next input byte */
    this.input = null; // JS specific, because we have no pointers
    this.next_in = 0;
    /* number of bytes available at input */
    this.avail_in = 0;
    /* total number of input bytes read so far */
    this.total_in = 0;
    /* next output byte should be put there */
    this.output = null; // JS specific, because we have no pointers
    this.next_out = 0;
    /* remaining free space at output */
    this.avail_out = 0;
    /* total number of bytes output so far */
    this.total_out = 0;
    /* last error message, NULL if no error */
    this.msg = ''/*Z_NULL*/;
    /* not visible by applications */
    this.state = null;
    /* best guess about the data type: binary or text */
    this.data_type = 2/*Z_UNKNOWN*/;
    /* adler32 value of the uncompressed data */
    this.adler = 0;
  }
docs: (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.