diff --git a/dist/filer.js b/dist/filer.js
index b96a8d9..c174917 100644
--- a/dist/filer.js
+++ b/dist/filer.js
@@ -3324,7 +3324,12 @@ define('src/constants',['require'],function(require) {
     FS_PENDING: 'PENDING',
     FS_ERROR: 'ERROR',
 
-    SUPER_NODE_ID: '00000000-0000-0000-0000-000000000000'
+    SUPER_NODE_ID: '00000000-0000-0000-0000-000000000000',
+
+    ENVIRONMENT: {
+      TMP: '/tmp',
+      PATH: ''
+    }
   };
 
 });
@@ -3585,29 +3590,975 @@ define('src/providers/websql',['require','src/constants','src/constants','src/co
   return WebSQL;
 });
 
-define('src/providers/memory',['require','src/constants'],function(require) {
+/*global setImmediate: false, setTimeout: false, console: false */
+
+/**
+ * https://raw.github.com/caolan/async/master/lib/async.js Feb 18, 2014
+ * Used under MIT - https://github.com/caolan/async/blob/master/LICENSE
+ */
+
+(function () {
+
+    var async = {};
+
+    // global on the server, window in the browser
+    var root, previous_async;
+
+    root = this;
+    if (root != null) {
+      previous_async = root.async;
+    }
+
+    async.noConflict = function () {
+        root.async = previous_async;
+        return async;
+    };
+
+    function only_once(fn) {
+        var called = false;
+        return function() {
+            if (called) throw new Error("Callback was already called.");
+            called = true;
+            fn.apply(root, arguments);
+        }
+    }
+
+    //// cross-browser compatiblity functions ////
+
+    var _each = function (arr, iterator) {
+        if (arr.forEach) {
+            return arr.forEach(iterator);
+        }
+        for (var i = 0; i < arr.length; i += 1) {
+            iterator(arr[i], i, arr);
+        }
+    };
+
+    var _map = function (arr, iterator) {
+        if (arr.map) {
+            return arr.map(iterator);
+        }
+        var results = [];
+        _each(arr, function (x, i, a) {
+            results.push(iterator(x, i, a));
+        });
+        return results;
+    };
+
+    var _reduce = function (arr, iterator, memo) {
+        if (arr.reduce) {
+            return arr.reduce(iterator, memo);
+        }
+        _each(arr, function (x, i, a) {
+            memo = iterator(memo, x, i, a);
+        });
+        return memo;
+    };
+
+    var _keys = function (obj) {
+        if (Object.keys) {
+            return Object.keys(obj);
+        }
+        var keys = [];
+        for (var k in obj) {
+            if (obj.hasOwnProperty(k)) {
+                keys.push(k);
+            }
+        }
+        return keys;
+    };
+
+    //// exported async module functions ////
+
+    //// nextTick implementation with browser-compatible fallback ////
+    if (typeof process === 'undefined' || !(process.nextTick)) {
+        if (typeof setImmediate === 'function') {
+            async.nextTick = function (fn) {
+                // not a direct alias for IE10 compatibility
+                setImmediate(fn);
+            };
+            async.setImmediate = async.nextTick;
+        }
+        else {
+            async.nextTick = function (fn) {
+                setTimeout(fn, 0);
+            };
+            async.setImmediate = async.nextTick;
+        }
+    }
+    else {
+        async.nextTick = process.nextTick;
+        if (typeof setImmediate !== 'undefined') {
+            async.setImmediate = function (fn) {
+              // not a direct alias for IE10 compatibility
+              setImmediate(fn);
+            };
+        }
+        else {
+            async.setImmediate = async.nextTick;
+        }
+    }
+
+    async.each = function (arr, iterator, callback) {
+        callback = callback || function () {};
+        if (!arr.length) {
+            return callback();
+        }
+        var completed = 0;
+        _each(arr, function (x) {
+            iterator(x, only_once(function (err) {
+                if (err) {
+                    callback(err);
+                    callback = function () {};
+                }
+                else {
+                    completed += 1;
+                    if (completed >= arr.length) {
+                        callback(null);
+                    }
+                }
+            }));
+        });
+    };
+    async.forEach = async.each;
+
+    async.eachSeries = function (arr, iterator, callback) {
+        callback = callback || function () {};
+        if (!arr.length) {
+            return callback();
+        }
+        var completed = 0;
+        var iterate = function () {
+            iterator(arr[completed], function (err) {
+                if (err) {
+                    callback(err);
+                    callback = function () {};
+                }
+                else {
+                    completed += 1;
+                    if (completed >= arr.length) {
+                        callback(null);
+                    }
+                    else {
+                        iterate();
+                    }
+                }
+            });
+        };
+        iterate();
+    };
+    async.forEachSeries = async.eachSeries;
+
+    async.eachLimit = function (arr, limit, iterator, callback) {
+        var fn = _eachLimit(limit);
+        fn.apply(null, [arr, iterator, callback]);
+    };
+    async.forEachLimit = async.eachLimit;
+
+    var _eachLimit = function (limit) {
+
+        return function (arr, iterator, callback) {
+            callback = callback || function () {};
+            if (!arr.length || limit <= 0) {
+                return callback();
+            }
+            var completed = 0;
+            var started = 0;
+            var running = 0;
+
+            (function replenish () {
+                if (completed >= arr.length) {
+                    return callback();
+                }
+
+                while (running < limit && started < arr.length) {
+                    started += 1;
+                    running += 1;
+                    iterator(arr[started - 1], function (err) {
+                        if (err) {
+                            callback(err);
+                            callback = function () {};
+                        }
+                        else {
+                            completed += 1;
+                            running -= 1;
+                            if (completed >= arr.length) {
+                                callback();
+                            }
+                            else {
+                                replenish();
+                            }
+                        }
+                    });
+                }
+            })();
+        };
+    };
+
+
+    var doParallel = function (fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [async.each].concat(args));
+        };
+    };
+    var doParallelLimit = function(limit, fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [_eachLimit(limit)].concat(args));
+        };
+    };
+    var doSeries = function (fn) {
+        return function () {
+            var args = Array.prototype.slice.call(arguments);
+            return fn.apply(null, [async.eachSeries].concat(args));
+        };
+    };
+
+
+    var _asyncMap = function (eachfn, arr, iterator, callback) {
+        var results = [];
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        eachfn(arr, function (x, callback) {
+            iterator(x.value, function (err, v) {
+                results[x.index] = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, results);
+        });
+    };
+    async.map = doParallel(_asyncMap);
+    async.mapSeries = doSeries(_asyncMap);
+    async.mapLimit = function (arr, limit, iterator, callback) {
+        return _mapLimit(limit)(arr, iterator, callback);
+    };
+
+    var _mapLimit = function(limit) {
+        return doParallelLimit(limit, _asyncMap);
+    };
+
+    // reduce only has a series version, as doing reduce in parallel won't
+    // work in many situations.
+    async.reduce = function (arr, memo, iterator, callback) {
+        async.eachSeries(arr, function (x, callback) {
+            iterator(memo, x, function (err, v) {
+                memo = v;
+                callback(err);
+            });
+        }, function (err) {
+            callback(err, memo);
+        });
+    };
+    // inject alias
+    async.inject = async.reduce;
+    // foldl alias
+    async.foldl = async.reduce;
+
+    async.reduceRight = function (arr, memo, iterator, callback) {
+        var reversed = _map(arr, function (x) {
+            return x;
+        }).reverse();
+        async.reduce(reversed, memo, iterator, callback);
+    };
+    // foldr alias
+    async.foldr = async.reduceRight;
+
+    var _filter = function (eachfn, arr, iterator, callback) {
+        var results = [];
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        eachfn(arr, function (x, callback) {
+            iterator(x.value, function (v) {
+                if (v) {
+                    results.push(x);
+                }
+                callback();
+            });
+        }, function (err) {
+            callback(_map(results.sort(function (a, b) {
+                return a.index - b.index;
+            }), function (x) {
+                return x.value;
+            }));
+        });
+    };
+    async.filter = doParallel(_filter);
+    async.filterSeries = doSeries(_filter);
+    // select alias
+    async.select = async.filter;
+    async.selectSeries = async.filterSeries;
+
+    var _reject = function (eachfn, arr, iterator, callback) {
+        var results = [];
+        arr = _map(arr, function (x, i) {
+            return {index: i, value: x};
+        });
+        eachfn(arr, function (x, callback) {
+            iterator(x.value, function (v) {
+                if (!v) {
+                    results.push(x);
+                }
+                callback();
+            });
+        }, function (err) {
+            callback(_map(results.sort(function (a, b) {
+                return a.index - b.index;
+            }), function (x) {
+                return x.value;
+            }));
+        });
+    };
+    async.reject = doParallel(_reject);
+    async.rejectSeries = doSeries(_reject);
+
+    var _detect = function (eachfn, arr, iterator, main_callback) {
+        eachfn(arr, function (x, callback) {
+            iterator(x, function (result) {
+                if (result) {
+                    main_callback(x);
+                    main_callback = function () {};
+                }
+                else {
+                    callback();
+                }
+            });
+        }, function (err) {
+            main_callback();
+        });
+    };
+    async.detect = doParallel(_detect);
+    async.detectSeries = doSeries(_detect);
+
+    async.some = function (arr, iterator, main_callback) {
+        async.each(arr, function (x, callback) {
+            iterator(x, function (v) {
+                if (v) {
+                    main_callback(true);
+                    main_callback = function () {};
+                }
+                callback();
+            });
+        }, function (err) {
+            main_callback(false);
+        });
+    };
+    // any alias
+    async.any = async.some;
+
+    async.every = function (arr, iterator, main_callback) {
+        async.each(arr, function (x, callback) {
+            iterator(x, function (v) {
+                if (!v) {
+                    main_callback(false);
+                    main_callback = function () {};
+                }
+                callback();
+            });
+        }, function (err) {
+            main_callback(true);
+        });
+    };
+    // all alias
+    async.all = async.every;
+
+    async.sortBy = function (arr, iterator, callback) {
+        async.map(arr, function (x, callback) {
+            iterator(x, function (err, criteria) {
+                if (err) {
+                    callback(err);
+                }
+                else {
+                    callback(null, {value: x, criteria: criteria});
+                }
+            });
+        }, function (err, results) {
+            if (err) {
+                return callback(err);
+            }
+            else {
+                var fn = function (left, right) {
+                    var a = left.criteria, b = right.criteria;
+                    return a < b ? -1 : a > b ? 1 : 0;
+                };
+                callback(null, _map(results.sort(fn), function (x) {
+                    return x.value;
+                }));
+            }
+        });
+    };
+
+    async.auto = function (tasks, callback) {
+        callback = callback || function () {};
+        var keys = _keys(tasks);
+        if (!keys.length) {
+            return callback(null);
+        }
+
+        var results = {};
+
+        var listeners = [];
+        var addListener = function (fn) {
+            listeners.unshift(fn);
+        };
+        var removeListener = function (fn) {
+            for (var i = 0; i < listeners.length; i += 1) {
+                if (listeners[i] === fn) {
+                    listeners.splice(i, 1);
+                    return;
+                }
+            }
+        };
+        var taskComplete = function () {
+            _each(listeners.slice(0), function (fn) {
+                fn();
+            });
+        };
+
+        addListener(function () {
+            if (_keys(results).length === keys.length) {
+                callback(null, results);
+                callback = function () {};
+            }
+        });
+
+        _each(keys, function (k) {
+            var task = (tasks[k] instanceof Function) ? [tasks[k]]: tasks[k];
+            var taskCallback = function (err) {
+                var args = Array.prototype.slice.call(arguments, 1);
+                if (args.length <= 1) {
+                    args = args[0];
+                }
+                if (err) {
+                    var safeResults = {};
+                    _each(_keys(results), function(rkey) {
+                        safeResults[rkey] = results[rkey];
+                    });
+                    safeResults[k] = args;
+                    callback(err, safeResults);
+                    // stop subsequent errors hitting callback multiple times
+                    callback = function () {};
+                }
+                else {
+                    results[k] = args;
+                    async.setImmediate(taskComplete);
+                }
+            };
+            var requires = task.slice(0, Math.abs(task.length - 1)) || [];
+            var ready = function () {
+                return _reduce(requires, function (a, x) {
+                    return (a && results.hasOwnProperty(x));
+                }, true) && !results.hasOwnProperty(k);
+            };
+            if (ready()) {
+                task[task.length - 1](taskCallback, results);
+            }
+            else {
+                var listener = function () {
+                    if (ready()) {
+                        removeListener(listener);
+                        task[task.length - 1](taskCallback, results);
+                    }
+                };
+                addListener(listener);
+            }
+        });
+    };
+
+    async.waterfall = function (tasks, callback) {
+        callback = callback || function () {};
+        if (tasks.constructor !== Array) {
+          var err = new Error('First argument to waterfall must be an array of functions');
+          return callback(err);
+        }
+        if (!tasks.length) {
+            return callback();
+        }
+        var wrapIterator = function (iterator) {
+            return function (err) {
+                if (err) {
+                    callback.apply(null, arguments);
+                    callback = function () {};
+                }
+                else {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    var next = iterator.next();
+                    if (next) {
+                        args.push(wrapIterator(next));
+                    }
+                    else {
+                        args.push(callback);
+                    }
+                    async.setImmediate(function () {
+                        iterator.apply(null, args);
+                    });
+                }
+            };
+        };
+        wrapIterator(async.iterator(tasks))();
+    };
+
+    var _parallel = function(eachfn, tasks, callback) {
+        callback = callback || function () {};
+        if (tasks.constructor === Array) {
+            eachfn.map(tasks, function (fn, callback) {
+                if (fn) {
+                    fn(function (err) {
+                        var args = Array.prototype.slice.call(arguments, 1);
+                        if (args.length <= 1) {
+                            args = args[0];
+                        }
+                        callback.call(null, err, args);
+                    });
+                }
+            }, callback);
+        }
+        else {
+            var results = {};
+            eachfn.each(_keys(tasks), function (k, callback) {
+                tasks[k](function (err) {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    if (args.length <= 1) {
+                        args = args[0];
+                    }
+                    results[k] = args;
+                    callback(err);
+                });
+            }, function (err) {
+                callback(err, results);
+            });
+        }
+    };
+
+    async.parallel = function (tasks, callback) {
+        _parallel({ map: async.map, each: async.each }, tasks, callback);
+    };
+
+    async.parallelLimit = function(tasks, limit, callback) {
+        _parallel({ map: _mapLimit(limit), each: _eachLimit(limit) }, tasks, callback);
+    };
+
+    async.series = function (tasks, callback) {
+        callback = callback || function () {};
+        if (tasks.constructor === Array) {
+            async.mapSeries(tasks, function (fn, callback) {
+                if (fn) {
+                    fn(function (err) {
+                        var args = Array.prototype.slice.call(arguments, 1);
+                        if (args.length <= 1) {
+                            args = args[0];
+                        }
+                        callback.call(null, err, args);
+                    });
+                }
+            }, callback);
+        }
+        else {
+            var results = {};
+            async.eachSeries(_keys(tasks), function (k, callback) {
+                tasks[k](function (err) {
+                    var args = Array.prototype.slice.call(arguments, 1);
+                    if (args.length <= 1) {
+                        args = args[0];
+                    }
+                    results[k] = args;
+                    callback(err);
+                });
+            }, function (err) {
+                callback(err, results);
+            });
+        }
+    };
+
+    async.iterator = function (tasks) {
+        var makeCallback = function (index) {
+            var fn = function () {
+                if (tasks.length) {
+                    tasks[index].apply(null, arguments);
+                }
+                return fn.next();
+            };
+            fn.next = function () {
+                return (index < tasks.length - 1) ? makeCallback(index + 1): null;
+            };
+            return fn;
+        };
+        return makeCallback(0);
+    };
+
+    async.apply = function (fn) {
+        var args = Array.prototype.slice.call(arguments, 1);
+        return function () {
+            return fn.apply(
+                null, args.concat(Array.prototype.slice.call(arguments))
+            );
+        };
+    };
+
+    var _concat = function (eachfn, arr, fn, callback) {
+        var r = [];
+        eachfn(arr, function (x, cb) {
+            fn(x, function (err, y) {
+                r = r.concat(y || []);
+                cb(err);
+            });
+        }, function (err) {
+            callback(err, r);
+        });
+    };
+    async.concat = doParallel(_concat);
+    async.concatSeries = doSeries(_concat);
+
+    async.whilst = function (test, iterator, callback) {
+        if (test()) {
+            iterator(function (err) {
+                if (err) {
+                    return callback(err);
+                }
+                async.whilst(test, iterator, callback);
+            });
+        }
+        else {
+            callback();
+        }
+    };
+
+    async.doWhilst = function (iterator, test, callback) {
+        iterator(function (err) {
+            if (err) {
+                return callback(err);
+            }
+            if (test()) {
+                async.doWhilst(iterator, test, callback);
+            }
+            else {
+                callback();
+            }
+        });
+    };
+
+    async.until = function (test, iterator, callback) {
+        if (!test()) {
+            iterator(function (err) {
+                if (err) {
+                    return callback(err);
+                }
+                async.until(test, iterator, callback);
+            });
+        }
+        else {
+            callback();
+        }
+    };
+
+    async.doUntil = function (iterator, test, callback) {
+        iterator(function (err) {
+            if (err) {
+                return callback(err);
+            }
+            if (!test()) {
+                async.doUntil(iterator, test, callback);
+            }
+            else {
+                callback();
+            }
+        });
+    };
+
+    async.queue = function (worker, concurrency) {
+        if (concurrency === undefined) {
+            concurrency = 1;
+        }
+        function _insert(q, data, pos, callback) {
+          if(data.constructor !== Array) {
+              data = [data];
+          }
+          _each(data, function(task) {
+              var item = {
+                  data: task,
+                  callback: typeof callback === 'function' ? callback : null
+              };
+
+              if (pos) {
+                q.tasks.unshift(item);
+              } else {
+                q.tasks.push(item);
+              }
+
+              if (q.saturated && q.tasks.length === concurrency) {
+                  q.saturated();
+              }
+              async.setImmediate(q.process);
+          });
+        }
+
+        var workers = 0;
+        var q = {
+            tasks: [],
+            concurrency: concurrency,
+            saturated: null,
+            empty: null,
+            drain: null,
+            push: function (data, callback) {
+              _insert(q, data, false, callback);
+            },
+            unshift: function (data, callback) {
+              _insert(q, data, true, callback);
+            },
+            process: function () {
+                if (workers < q.concurrency && q.tasks.length) {
+                    var task = q.tasks.shift();
+                    if (q.empty && q.tasks.length === 0) {
+                        q.empty();
+                    }
+                    workers += 1;
+                    var next = function () {
+                        workers -= 1;
+                        if (task.callback) {
+                            task.callback.apply(task, arguments);
+                        }
+                        if (q.drain && q.tasks.length + workers === 0) {
+                            q.drain();
+                        }
+                        q.process();
+                    };
+                    var cb = only_once(next);
+                    worker(task.data, cb);
+                }
+            },
+            length: function () {
+                return q.tasks.length;
+            },
+            running: function () {
+                return workers;
+            }
+        };
+        return q;
+    };
+
+    async.cargo = function (worker, payload) {
+        var working     = false,
+            tasks       = [];
+
+        var cargo = {
+            tasks: tasks,
+            payload: payload,
+            saturated: null,
+            empty: null,
+            drain: null,
+            push: function (data, callback) {
+                if(data.constructor !== Array) {
+                    data = [data];
+                }
+                _each(data, function(task) {
+                    tasks.push({
+                        data: task,
+                        callback: typeof callback === 'function' ? callback : null
+                    });
+                    if (cargo.saturated && tasks.length === payload) {
+                        cargo.saturated();
+                    }
+                });
+                async.setImmediate(cargo.process);
+            },
+            process: function process() {
+                if (working) return;
+                if (tasks.length === 0) {
+                    if(cargo.drain) cargo.drain();
+                    return;
+                }
+
+                var ts = typeof payload === 'number'
+                            ? tasks.splice(0, payload)
+                            : tasks.splice(0);
+
+                var ds = _map(ts, function (task) {
+                    return task.data;
+                });
+
+                if(cargo.empty) cargo.empty();
+                working = true;
+                worker(ds, function () {
+                    working = false;
+
+                    var args = arguments;
+                    _each(ts, function (data) {
+                        if (data.callback) {
+                            data.callback.apply(null, args);
+                        }
+                    });
+
+                    process();
+                });
+            },
+            length: function () {
+                return tasks.length;
+            },
+            running: function () {
+                return working;
+            }
+        };
+        return cargo;
+    };
+
+    var _console_fn = function (name) {
+        return function (fn) {
+            var args = Array.prototype.slice.call(arguments, 1);
+            fn.apply(null, args.concat([function (err) {
+                var args = Array.prototype.slice.call(arguments, 1);
+                if (typeof console !== 'undefined') {
+                    if (err) {
+                        if (console.error) {
+                            console.error(err);
+                        }
+                    }
+                    else if (console[name]) {
+                        _each(args, function (x) {
+                            console[name](x);
+                        });
+                    }
+                }
+            }]));
+        };
+    };
+    async.log = _console_fn('log');
+    async.dir = _console_fn('dir');
+    /*async.info = _console_fn('info');
+    async.warn = _console_fn('warn');
+    async.error = _console_fn('error');*/
+
+    async.memoize = function (fn, hasher) {
+        var memo = {};
+        var queues = {};
+        hasher = hasher || function (x) {
+            return x;
+        };
+        var memoized = function () {
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            var key = hasher.apply(null, args);
+            if (key in memo) {
+                callback.apply(null, memo[key]);
+            }
+            else if (key in queues) {
+                queues[key].push(callback);
+            }
+            else {
+                queues[key] = [callback];
+                fn.apply(null, args.concat([function () {
+                    memo[key] = arguments;
+                    var q = queues[key];
+                    delete queues[key];
+                    for (var i = 0, l = q.length; i < l; i++) {
+                      q[i].apply(null, arguments);
+                    }
+                }]));
+            }
+        };
+        memoized.memo = memo;
+        memoized.unmemoized = fn;
+        return memoized;
+    };
+
+    async.unmemoize = function (fn) {
+      return function () {
+        return (fn.unmemoized || fn).apply(null, arguments);
+      };
+    };
+
+    async.times = function (count, iterator, callback) {
+        var counter = [];
+        for (var i = 0; i < count; i++) {
+            counter.push(i);
+        }
+        return async.map(counter, iterator, callback);
+    };
+
+    async.timesSeries = function (count, iterator, callback) {
+        var counter = [];
+        for (var i = 0; i < count; i++) {
+            counter.push(i);
+        }
+        return async.mapSeries(counter, iterator, callback);
+    };
+
+    async.compose = function (/* functions... */) {
+        var fns = Array.prototype.reverse.call(arguments);
+        return function () {
+            var that = this;
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            async.reduce(fns, args, function (newargs, fn, cb) {
+                fn.apply(that, newargs.concat([function () {
+                    var err = arguments[0];
+                    var nextargs = Array.prototype.slice.call(arguments, 1);
+                    cb(err, nextargs);
+                }]))
+            },
+            function (err, results) {
+                callback.apply(that, [err].concat(results));
+            });
+        };
+    };
+
+    var _applyEach = function (eachfn, fns /*args...*/) {
+        var go = function () {
+            var that = this;
+            var args = Array.prototype.slice.call(arguments);
+            var callback = args.pop();
+            return eachfn(fns, function (fn, cb) {
+                fn.apply(that, args.concat([cb]));
+            },
+            callback);
+        };
+        if (arguments.length > 2) {
+            var args = Array.prototype.slice.call(arguments, 2);
+            return go.apply(this, args);
+        }
+        else {
+            return go;
+        }
+    };
+    async.applyEach = doParallel(_applyEach);
+    async.applyEachSeries = doSeries(_applyEach);
+
+    async.forever = function (fn, callback) {
+        function next(err) {
+            if (err) {
+                if (callback) {
+                    return callback(err);
+                }
+                throw err;
+            }
+            fn(next);
+        }
+        next();
+    };
+
+    // AMD / RequireJS
+    if (typeof define !== 'undefined' && define.amd) {
+        define('async',[], function () {
+            return async;
+        });
+    }
+    // Node.js
+    else if (typeof module !== 'undefined' && module.exports) {
+        module.exports = async;
+    }
+    // included directly via <script> tag
+    else {
+        root.async = async;
+    }
+
+}());
+
+define('src/providers/memory',['require','src/constants','async'],function(require) {
   var FILE_SYSTEM_NAME = require('src/constants').FILE_SYSTEM_NAME;
 
-  // Based on https://github.com/caolan/async/blob/master/lib/async.js
-  var nextTick = (function() {
-    if (typeof process === 'undefined' || !(process.nextTick)) {
-      if (typeof setImmediate === 'function') {
-        return function (fn) {
-          // not a direct alias for IE10 compatibility
-          setImmediate(fn);
-        };
-      } else {
-        return function (fn) {
-          setTimeout(fn, 0);
-        };
-      }
-    }
-    return process.nextTick;
-  }());
-
-  function asyncCallback(callback) {
-    nextTick(callback);
-  }
+  var asyncCallback = require('async').nextTick;
 
   function MemoryContext(db, readOnly) {
     this.readOnly = readOnly;
@@ -3992,7 +4943,387 @@ define('src/adapters/adapters',['require','src/adapters/zlib','src/adapters/cryp
 
 });
 
-define('src/fs',['require','nodash','encoding','src/path','src/path','src/path','src/shared','src/shared','src/shared','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/providers/providers','src/adapters/adapters'],function(require) {
+define('src/environment',['require','src/constants'],function(require) {
+
+  var defaults = require('src/constants').ENVIRONMENT;
+
+  function Environment(env) {
+    env = env || {};
+    env.TMP = env.TMP || defaults.TMP;
+    env.PATH = env.PATH || defaults.PATH;
+
+    this.get = function(name) {
+      return env[name];
+    };
+
+    this.set = function(name, value) {
+      env[name] = value;
+    };
+  }
+
+  return Environment;
+});
+
+/* jshint evil:true */
+define('src/shell',['require','src/path','src/error','src/environment','async'],function(require) {
+
+  var Path = require('src/path');
+  var FilerError = require('src/error');
+  var Environment = require('src/environment');
+  var async = require('async');
+
+  function Shell(fs, options) {
+    options = options || {};
+
+    var env = new Environment(options.env);
+    var cwd = '/';
+
+    /**
+     * The bound FileSystem (cannot be changed)
+     */
+    Object.defineProperty(this, 'fs', {
+      get: function() { return fs; },
+      enumerable: true
+    });
+
+    /**
+     * The shell's environment (e.g., for things like
+     * path, tmp, and other env vars). Use env.get()
+     * and env.set() to work with variables.
+     */
+    Object.defineProperty(this, 'env', {
+      get: function() { return env; },
+      enumerable: true
+    });
+
+    /**
+     * Change the current working directory. We
+     * include `cd` on the `this` vs. proto so that
+     * we can access cwd without exposing it externally.
+     */
+    this.cd = function(path, callback) {
+      path = Path.resolve(this.cwd, path);
+      // Make sure the path actually exists, and is a dir
+      fs.stat(path, function(err, stats) {
+        if(err) {
+          callback(new FilerError.ENotDirectory());
+          return;
+        }
+        if(stats.type === 'DIRECTORY') {
+          cwd = path;
+          callback();
+        } else {
+          callback(new FilerError.ENotDirectory());
+        }
+      });
+    };
+
+    /**
+     * Get the current working directory (changed with `cd()`)
+     */
+    this.pwd = function() {
+      return cwd;
+    };
+  }
+
+  /**
+   * Execute the .js command located at `path`. Such commands
+   * should assume the existence of 3 arguments, which will be
+   * defined at runtime:
+   *
+   *   * fs - the current shell's bound filesystem object
+   *   * args - a list of arguments for the command, or an empty list if none
+   *   * callback - a callback function(error, result) to call when done.
+   *
+   * The .js command's contents should be the body of a function
+   * that looks like this:
+   *
+   * function(fs, args, callback) {
+   *   // .js code here
+   * }
+   */
+  Shell.prototype.exec = function(path, args, callback) {
+    var fs = this.fs;
+    if(typeof args === 'function') {
+      callback = args;
+      args = [];
+    }
+    args = args || [];
+    callback = callback || function(){};
+    path = Path.resolve(this.cwd, path);
+
+    fs.readFile(path, "utf8", function(error, data) {
+      if(error) {
+        callback(error);
+        return;
+      }
+      try {
+        var cmd = new Function('fs', 'args', 'callback', data);
+        cmd(fs, args, callback);
+      } catch(e) {
+        callback(e);
+      }
+    });
+  };
+
+  /**
+   * Create a file if it does not exist, or update access and
+   * modified times if it does. Valid options include:
+   *
+   *  * updateOnly - whether to create the file if missing (defaults to false)
+   *  * date - use the provided Date value instead of current date/time
+   */
+  Shell.prototype.touch = function(path, options, callback) {
+    var fs = this.fs;
+    if(typeof options === 'function') {
+      callback = options;
+      options = {};
+    }
+    options = options || {};
+    callback = callback || function(){};
+    path = Path.resolve(this.cwd, path);
+
+    function createFile(path) {
+      fs.writeFile(path, '', callback);
+    }
+
+    function updateTimes(path) {
+      var now = Date.now();
+      var atime = options.date || now;
+      var mtime = options.date || now;
+
+      fs.utimes(path, atime, mtime, callback);
+    }
+
+    fs.stat(path, function(error, stats) {
+      if(error) {
+        if(options.updateOnly === true) {
+          callback();
+        } else {
+          createFile(path);
+        }
+      } else {
+        updateTimes(path);
+      }
+    });
+  };
+
+  /**
+   * Concatenate multiple files into a single String, with each
+   * file separated by a newline. The `files` argument should
+   * be a String (path to single file) or an Array of Strings
+   * (multiple file paths).
+   */
+  Shell.prototype.cat = function(files, callback) {
+    var fs = this.fs;
+    var all = '';
+    callback = callback || function(){};
+
+    if(!files) {
+      callback(new Error("Missing files argument"));
+      return;
+    }
+
+    files = typeof files === 'string' ? [ files ] : files;
+
+    function append(item, callback) {
+      var filename = Path.resolve(this.cwd, item);
+      fs.readFile(filename, 'utf8', function(error, data) {
+        if(error) {
+          callback(error);
+          return;
+        }
+        all += data + '\n';
+        callback();
+      });
+    }
+
+    async.eachSeries(files, append, function(error) {
+      if(error) {
+        callback(error);
+      } else {
+        callback(null, all.replace(/\n$/, ''));
+      }
+    });
+  };
+
+  /**
+   * Get the listing of a directory, returning an array of
+   * file entries in the following form:
+   *
+   * {
+   *   path: <String> the basename of the directory entry
+   *   links: <Number> the number of links to the entry
+   *   size: <Number> the size in bytes of the entry
+   *   modified: <Number> the last modified date/time
+   *   type: <String> the type of the entry
+   *   contents: <Array> an optional array of child entries
+   * }
+   *
+   * By default ls() gives a shallow listing. If you want
+   * to follow directories as they are encountered, use
+   * the `recursive=true` option.
+   */
+  Shell.prototype.ls = function(dir, options, callback) {
+    var fs = this.fs;
+    if(typeof options === 'function') {
+      callback = options;
+      options = {};
+    }
+    options = options || {};
+    callback = callback || function(){};
+
+    if(!dir) {
+      callback(new Error("Missing dir argument"));
+      return;
+    }
+
+    function list(path, callback) {
+      var pathname = Path.resolve(this.cwd, path);
+      var result = [];
+
+      fs.readdir(pathname, function(error, entries) {
+        if(error) {
+          callback(error);
+          return;
+        }
+
+        function getDirEntry(name, callback) {
+          name = Path.join(pathname, name);
+          fs.stat(name, function(error, stats) {
+            if(error) {
+              callback(error);
+              return;
+            }
+            var entry = {
+              path: Path.basename(name),
+              links: stats.nlinks,
+              size: stats.size,
+              modified: stats.mtime,
+              type: stats.type
+            };
+
+            if(options.recursive && stats.type === 'DIRECTORY') {
+              list(Path.join(pathname, entry.path), function(error, items) {
+                if(error) {
+                  callback(error);
+                  return;
+                }
+                entry.contents = items;
+                result.push(entry);
+                callback();
+              });
+            } else {
+              result.push(entry);
+              callback();
+            }
+          });
+        }
+
+        async.each(entries, getDirEntry, function(error) {
+          callback(error, result);
+        });
+      });
+    }
+
+    list(dir, callback);
+  };
+
+  /**
+   * Removes the file or directory at `path`. If `path` is a file
+   * it will be removed. If `path` is a directory, it will be
+   * removed if it is empty, otherwise the callback will receive
+   * an error. In order to remove non-empty directories, use the
+   * `recursive=true` option.
+   */
+  Shell.prototype.rm = function(path, options, callback) {
+    var fs = this.fs;
+    if(typeof options === 'function') {
+      callback = options;
+      options = {};
+    }
+    options = options || {};
+    callback = callback || function(){};
+
+    if(!path) {
+      callback(new Error("Missing path argument"));
+      return;
+    }
+
+    function remove(pathname, callback) {
+      pathname = Path.resolve(this.cwd, pathname);
+      fs.stat(pathname, function(error, stats) {
+        if(error) {
+          callback(error);
+          return;
+        }
+
+        // If this is a file, delete it and we're done
+        if(stats.type === 'FILE') {
+          fs.unlink(pathname, callback);
+          return;
+        }
+
+        // If it's a dir, check if it's empty
+        fs.readdir(pathname, function(error, entries) {
+          if(error) {
+            callback(error);
+            return;
+          }
+
+          // If dir is empty, delete it and we're done
+          if(entries.length === 0) {
+            fs.rmdir(pathname, callback);
+            return;
+          }
+
+          // If not, see if we're allowed to delete recursively
+          if(!options.recursive) {
+            callback(new FilerError.ENotEmpty());
+            return;
+          }
+
+          // Remove each dir entry recursively, then delete the dir.
+          entries = entries.map(function(filename) {
+            // Root dir entries absolutely
+            return Path.join(pathname, filename);
+          });
+          async.each(entries, remove, function(error) {
+            if(error) {
+              callback(error);
+              return;
+            }
+            fs.rmdir(pathname, callback);
+          });
+        });
+      });
+    }
+
+    remove(path, callback);
+  };
+
+  /**
+   * Gets the path to the temporary directory, creating it if not
+   * present. The directory used is the one specified in
+   * env.TMP. The callback receives (error, tempDirName).
+   */
+  Shell.prototype.tempDir = function(callback) {
+    var fs = this.fs;
+    var tmp = this.env.get('TMP');
+    callback = callback || function(){};
+
+    // Try and create it, and it will either work or fail
+    // but either way it's now there.
+    fs.mkdir(tmp, function(err) {
+      callback(null, tmp);
+    });
+  };
+
+  return Shell;
+
+});
+
+define('src/fs',['require','nodash','encoding','src/path','src/path','src/path','src/shared','src/shared','src/shared','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/error','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/constants','src/providers/providers','src/adapters/adapters','src/shell'],function(require) {
 
   var _ = require('nodash');
 
@@ -4047,6 +5378,7 @@ define('src/fs',['require','nodash','encoding','src/path','src/path','src/path',
 
   var providers = require('src/providers/providers');
   var adapters = require('src/adapters/adapters');
+  var Shell = require('src/shell');
 
   /*
    * DirectoryEntry
@@ -6467,6 +7799,10 @@ define('src/fs',['require','nodash','encoding','src/path','src/path','src/path',
       callback(error);
     }
   };
+  FileSystem.prototype.Shell = function(options) {
+    return new Shell(this, options);
+  };
+
   return FileSystem;
 
 });
@@ -6478,9 +7814,10 @@ define('src/index',['require','src/fs','src/fs','src/path'],function(require) {
   return {
     FileSystem: require('src/fs'),
     Path: require('src/path')
-  }
+  };
 
 });
+
   var Filer = require( "src/index" );
 
   return Filer;
diff --git a/dist/filer.min.js b/dist/filer.min.js
index 7958e83..0d50620 100644
--- a/dist/filer.min.js
+++ b/dist/filer.min.js
@@ -1,4 +1,5 @@
-/*! filer 2014-02-19 */
-(function(t,e){"object"==typeof exports?module.exports=e():"function"==typeof define&&define.amd?define(e):t.Filer||(t.Filer=e())})(this,function(){var t,e,n;(function(r){function i(t,e){return w.call(t,e)}function o(t,e){var n,r,i,o,s,a,c,u,f,l,h=e&&e.split("/"),d=m.map,p=d&&d["*"]||{};if(t&&"."===t.charAt(0))if(e){for(h=h.slice(0,h.length-1),t=h.concat(t.split("/")),u=0;t.length>u;u+=1)if(l=t[u],"."===l)t.splice(u,1),u-=1;else if(".."===l){if(1===u&&(".."===t[2]||".."===t[0]))break;u>0&&(t.splice(u-1,2),u-=2)}t=t.join("/")}else 0===t.indexOf("./")&&(t=t.substring(2));if((h||p)&&d){for(n=t.split("/"),u=n.length;u>0;u-=1){if(r=n.slice(0,u).join("/"),h)for(f=h.length;f>0;f-=1)if(i=d[h.slice(0,f).join("/")],i&&(i=i[r])){o=i,s=u;break}if(o)break;!a&&p&&p[r]&&(a=p[r],c=u)}!o&&a&&(o=a,s=c),o&&(n.splice(0,s,o),t=n.join("/"))}return t}function s(t,e){return function(){return d.apply(r,E.call(arguments,0).concat([t,e]))}}function a(t){return function(e){return o(e,t)}}function c(t){return 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K,Z,Q,V,G,$,J=C,te=D,ee=new(x?Uint32Array:Array)(J+te),ne=new(x?Uint32Array:Array)(316),re=new(x?Uint8Array:Array)(19);for(K=Z=0;J>K;K++)ee[Z++]=M[K];for(K=0;te>K;K++)ee[Z++]=z[K];if(!x)for(K=0,V=re.length;V>K;++K)re[K]=0;for(K=G=0,V=ee.length;V>K;K+=Z){for(Z=1;V>K+Z&&ee[K+Z]===ee[K];++Z);if(Q=Z,0===ee[K])if(3>Q)for(;Q-->0;)ne[G++]=0,re[0]++;else for(;Q>0;)$=138>Q?Q:138,$>Q-3&&Q>$&&($=Q-3),10>=$?(ne[G++]=17,ne[G++]=$-3,re[17]++):(ne[G++]=18,ne[G++]=$-11,re[18]++),Q-=$;else if(ne[G++]=ee[K],re[ee[K]]++,Q--,3>Q)for(;Q-->0;)ne[G++]=ee[K],re[ee[K]]++;else for(;Q>0;)$=6>Q?Q:6,$>Q-3&&Q>$&&($=Q-3),ne[G++]=16,ne[G++]=$-3,re[16]++,Q-=$}for(e=x?ne.subarray(0,G):ne.slice(0,G),N=u(re,7),q=0;19>q;q++)X[q]=N[Y[q]];for(B=19;B>4&&0===X[B-1];B--);for(F=l(N),H.d(C-257,5,E),H.d(D-1,5,E),H.d(B-4,4,E),q=0;B>q;q++)H.d(X[q],3,E);for(q=0,P=e.length;P>q;q++)if(L=e[q],H.d(F[L],N[L],E),L>=16){switch(q++,L){case 16:W=2;break;case 17:W=3;break;case 18:W=7;break;default:t("invalid code: "+L)}H.d(e[q],W,E)}var ie,oe,se,ae,ce,ue,fe,le,he=[j,M],de=[U,z];for(ce=he[0],ue=he[1],fe=de[0],le=de[1],ie=0,oe=R.length;oe>ie;++ie)if(se=R[ie],H.d(ce[se],ue[se],E),se>256)H.d(R[++ie],R[++ie],E),ae=R[++ie],H.d(fe[ae],le[ae],E),H.d(R[++ie],R[++ie],E);else if(256===se)break;this.a=H.finish(),this.b=this.a.length;break;default:t("invalid compression type")}return this.a};var M=function(){function e(e){switch(E){case 3===e:return[257,e-3,0];case 4===e:return[258,e-4,0];case 5===e:return[259,e-5,0];case 6===e:return[260,e-6,0];case 7===e:return[261,e-7,0];case 8===e:return[262,e-8,0];case 9===e:return[263,e-9,0];case 10===e:return[264,e-10,0];case 12>=e:return[265,e-11,1];case 14>=e:return[266,e-13,1];case 16>=e:return[267,e-15,1];case 18>=e:return[268,e-17,1];case 22>=e:return[269,e-19,2];case 26>=e:return[270,e-23,2];case 30>=e:return[271,e-27,2];case 34>=e:return[272,e-31,2];case 42>=e:return[273,e-35,3];case 50>=e:return[274,e-43,3];case 58>=e:return[275,e-51,3];case 66>=e:return[276,e-59,3];case 82>=e:return[277,e-67,4];case 98>=e:return[278,e-83,4];case 114>=e:return[279,e-99,4];case 130>=e:return[280,e-115,4];case 162>=e:return[281,e-131,5];case 194>=e:return[282,e-163,5];case 226>=e:return[283,e-195,5];case 257>=e:return[284,e-227,5];case 258===e:return[285,e-258,0];default:t("invalid length: "+e)}}var n,r,i=[];for(n=3;258>=n;n++)r=e(n),i[n]=r[2]<<24|r[1]<<16|r[0];return i}(),j=x?new Uint32Array(M):M,z=0,U=1,N={D:z,C:U};h.prototype.p=function(){for(;!this.s;){var e=d(this,3);switch(1&e&&(this.s=E),e>>>=1){case 0:var n=this.input,r=this.c,i=this.a,o=this.b,s=w,a=w,c=w,u=i.length,f=w;switch(this.e=this.g=0,s=n[r++],s===w&&t(Error("invalid uncompressed block header: LEN (first byte)")),a=s,s=n[r++],s===w&&t(Error("invalid uncompressed block header: LEN (second byte)")),a|=s<<8,s=n[r++],s===w&&t(Error("invalid uncompressed block header: NLEN (first byte)")),c=s,s=n[r++],s===w&&t(Error("invalid uncompressed block header: NLEN (second byte)")),c|=s<<8,a===~c&&t(Error("invalid 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o=(255&e[i>>>2]>>>24-8*(i%4))<<16|(255&e[i+1>>>2]>>>24-8*((i+1)%4))<<8|255&e[i+2>>>2]>>>24-8*((i+2)%4),s=0;4>s&&n>i+.75*s;s++)t.push(r.charAt(63&o>>>6*(3-s)));if(e=r.charAt(64))for(;t.length%4;)t.push(e);return t.join("")},parse:function(t){var t=t.replace(/\s/g,""),n=t.length,r=this._map,i=r.charAt(64);i&&(i=t.indexOf(i),-1!=i&&(n=i));for(var i=[],o=0,s=0;n>s;s++)if(s%4){var a=r.indexOf(t.charAt(s-1))<<2*(s%4),c=r.indexOf(t.charAt(s))>>>6-2*(s%4);i[o>>>2]|=(a|c)<<24-8*(o%4),o++}return e.create(i,o)},_map:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="}})(),function(t){function e(t,e,n,r,i,o,s){return t=t+(e&n|~e&r)+i+s,(t<<o|t>>>32-o)+e}function n(t,e,n,r,i,o,s){return t=t+(e&r|n&~r)+i+s,(t<<o|t>>>32-o)+e}function i(t,e,n,r,i,o,s){return t=t+(e^n^r)+i+s,(t<<o|t>>>32-o)+e}function o(t,e,n,r,i,o,s){return t=t+(n^(e|~r))+i+s,(t<<o|t>>>32-o)+e}var s=r,a=s.lib,c=a.WordArray,a=a.Hasher,u=s.algo,f=[];(function(){for(var e=0;64>e;e++)f[e]=0|4294967296*t.abs(t.sin(e+1))})(),u=u.MD5=a.extend({_doReset:function(){this._hash=c.create([1732584193,4023233417,2562383102,271733878])},_doProcessBlock:function(t,r){for(var s=0;16>s;s++){var a=r+s,c=t[a];t[a]=16711935&(c<<8|c>>>24)|4278255360&(c<<24|c>>>8)}for(var 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t=this._data,e=t.words,n=8*this._nDataBytes,r=8*t.sigBytes;for(e[r>>>5]|=128<<24-r%32,e[(r+64>>>9<<4)+14]=16711935&(n<<8|n>>>24)|4278255360&(n<<24|n>>>8),t.sigBytes=4*(e.length+1),this._process(),t=this._hash.words,e=0;4>e;e++)n=t[e],t[e]=16711935&(n<<8|n>>>24)|4278255360&(n<<24|n>>>8)}}),s.MD5=a._createHelper(u),s.HmacMD5=a._createHmacHelper(u)}(Math),function(){var t=r,e=t.lib,n=e.Base,i=e.WordArray,e=t.algo,o=e.EvpKDF=n.extend({cfg:n.extend({keySize:4,hasher:e.MD5,iterations:1}),init:function(t){this.cfg=this.cfg.extend(t)},compute:function(t,e){for(var n=this.cfg,r=n.hasher.create(),o=i.create(),s=o.words,a=n.keySize,n=n.iterations;a>s.length;){c&&r.update(c);var c=r.update(t).finalize(e);r.reset();for(var u=1;n>u;u++)c=r.finalize(c),r.reset();o.concat(c)}return o.sigBytes=4*a,o}});t.EvpKDF=function(t,e,n){return o.create(n).compute(t,e)}}(),r.lib.Cipher||function(t){var 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n=t.createEncryptor;else n=t.createDecryptor,this._minBufferSize=1;this._mode=n.call(t,this,e&&e.words)},_doProcessBlock:function(t,e){this._mode.processBlock(t,e)},_doFinalize:function(){var t=this.cfg.padding;if(this._xformMode==this._ENC_XFORM_MODE){t.pad(this._data,this.blockSize);var e=this._process(!0)}else e=this._process(!0),t.unpad(e);return e},blockSize:4});var d=n.CipherParams=i.extend({init:function(t){this.mixIn(t)},toString:function(t){return(t||this.formatter).stringify(this)}}),f=(e.format={}).OpenSSL={stringify:function(t){var e=t.ciphertext,t=t.salt,e=(t?o.create([1398893684,1701076831]).concat(t).concat(e):e).toString(a);return e=e.replace(/(.{64})/g,"$1\n")},parse:function(t){var t=a.parse(t),e=t.words;if(1398893684==e[0]&&1701076831==e[1]){var n=o.create(e.slice(2,4));
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K,V,Z,Q,G,$,J=C,tn=I,nn=new(_?Uint32Array:Array)(J+tn),en=new(_?Uint32Array:Array)(316),rn=new(_?Uint8Array:Array)(19);for(K=V=0;J>K;K++)nn[V++]=M[K];for(K=0;tn>K;K++)nn[V++]=z[K];if(!_)for(K=0,Q=rn.length;Q>K;++K)rn[K]=0;for(K=G=0,Q=nn.length;Q>K;K+=V){for(V=1;Q>K+V&&nn[K+V]===nn[K];++V);if(Z=V,0===nn[K])if(3>Z)for(;Z-->0;)en[G++]=0,rn[0]++;else for(;Z>0;)$=138>Z?Z:138,$>Z-3&&Z>$&&($=Z-3),10>=$?(en[G++]=17,en[G++]=$-3,rn[17]++):(en[G++]=18,en[G++]=$-11,rn[18]++),Z-=$;else if(en[G++]=nn[K],rn[nn[K]]++,Z--,3>Z)for(;Z-->0;)en[G++]=nn[K],rn[nn[K]]++;else for(;Z>0;)$=6>Z?Z:6,$>Z-3&&Z>$&&($=Z-3),en[G++]=16,en[G++]=$-3,rn[16]++,Z-=$}for(n=_?en.subarray(0,G):en.slice(0,G),F=u(rn,7),W=0;19>W;W++)X[W]=F[Y[W]];for(T=19;T>4&&0===X[T-1];T--);for(U=l(F),H.d(C-257,5,E),H.d(I-1,5,E),H.d(T-4,4,E),W=0;T>W;W++)H.d(X[W],3,E);for(W=0,q=n.length;q>W;W++)if(L=n[W],H.d(U[L],F[L],E),L>=16){switch(W++,L){case 16:P=2;break;case 17:P=3;break;case 18:P=7;break;default:t("invalid code: "+L)}H.d(n[W],P,E)}var on,sn,an,cn,un,fn,ln,pn,hn=[j,M],dn=[N,z];for(un=hn[0],fn=hn[1],ln=dn[0],pn=dn[1],on=0,sn=R.length;sn>on;++on)if(an=R[on],H.d(un[an],fn[an],E),an>256)H.d(R[++on],R[++on],E),cn=R[++on],H.d(ln[cn],pn[cn],E),H.d(R[++on],R[++on],E);else if(256===an)break;this.a=H.finish(),this.b=this.a.length;break;default:t("invalid compression type")}return this.a};var M=function(){function n(n){switch(E){case 3===n:return[257,n-3,0];case 4===n:return[258,n-4,0];case 5===n:return[259,n-5,0];case 6===n:return[260,n-6,0];case 7===n:return[261,n-7,0];case 8===n:return[262,n-8,0];case 9===n:return[263,n-9,0];case 10===n:return[264,n-10,0];case 12>=n:return[265,n-11,1];case 14>=n:return[266,n-13,1];case 16>=n:return[267,n-15,1];case 18>=n:return[268,n-17,1];case 22>=n:return[269,n-19,2];case 26>=n:return[270,n-23,2];case 30>=n:return[271,n-27,2];case 34>=n:return[272,n-31,2];case 42>=n:return[273,n-35,3];case 50>=n:return[274,n-43,3];case 58>=n:return[275,n-51,3];case 66>=n:return[276,n-59,3];case 82>=n:return[277,n-67,4];case 98>=n:return[278,n-83,4];case 114>=n:return[279,n-99,4];case 130>=n:return[280,n-115,4];case 162>=n:return[281,n-131,5];case 194>=n:return[282,n-163,5];case 226>=n:return[283,n-195,5];case 257>=n:return[284,n-227,5];case 258===n:return[285,n-258,0];default:t("invalid length: "+n)}}var e,r,i=[];for(e=3;258>=e;e++)r=n(e),i[e]=r[2]<<24|r[1]<<16|r[0];return i}(),j=_?new Uint32Array(M):M,z=0,N=1,F={D:z,C:N};p.prototype.p=function(){for(;!this.s;){var n=h(this,3);switch(1&n&&(this.s=E),n>>>=1){case 0:var e=this.input,r=this.c,i=this.a,o=this.b,s=w,a=w,c=w,u=i.length,f=w;switch(this.e=this.g=0,s=e[r++],s===w&&t(Error("invalid uncompressed block header: LEN (first byte)")),a=s,s=e[r++],s===w&&t(Error("invalid uncompressed block header: LEN (second byte)")),a|=s<<8,s=e[r++],s===w&&t(Error("invalid uncompressed block header: NLEN (first byte)")),c=s,s=e[r++],s===w&&t(Error("invalid uncompressed block header: NLEN (second byte)")),c|=s<<8,a===~c&&t(Error("invalid 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for(o=i-257,a=H[o],X[o]>0&&(a+=h(this,X[o])),i=d(this,n),s=V[i],Q[i]>0&&(s+=h(this,Q[i])),r+a>c&&(e=this.f(),c=e.length);a--;)e[r]=e[r++-s];for(;this.e>=8;)this.e-=8,this.c--;this.b=r},p.prototype.f=function(){var t,n,e=new(_?Uint8Array:Array)(this.b-32768),r=this.b-32768,i=this.a;if(_)e.set(i.subarray(32768,e.length));else for(t=0,n=e.length;n>t;++t)e[t]=i[t+32768];if(this.l.push(e),this.q+=e.length,_)i.set(i.subarray(r,r+32768));else for(t=0;32768>t;++t)i[t]=i[r+t];return this.b=32768,i},p.prototype.J=function(t){var n,e,r,i,o=0|this.input.length/this.c+1,s=this.input,a=this.a;return t&&("number"==typeof t.v&&(o=t.v),"number"==typeof t.F&&(o+=t.F)),2>o?(e=(s.length-this.c)/this.u[2],i=0|258*(e/2),r=a.length>i?a.length+i:a.length<<1):r=a.length*o,_?(n=new Uint8Array(r),n.set(a)):n=a,this.a=n},p.prototype.t=function(){var t,n,e,r,i,o=0,s=this.a,a=this.l,c=new(_?Uint8Array:Array)(this.q+(this.b-32768));if(0===a.length)return 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