function AsyncGunzip(opts, cb) {
        var _this = this;
        astrmify([
            bInflt,
            guze,
            function () { return [astrm, Inflate, Gunzip]; }
        ], this, StrmOpt.call(this, opts, cb), function (ev) {
            var strm = new Gunzip(ev.data);
            strm.onmember = function (offset) { return postMessage(offset); };
            onmessage = astrm(strm);
        }, 9, 0, function (offset) { return _this.onmember && _this.onmember(offset); });
    }
Asynchronous streaming single or multi-member GZIP decompression