Fix: estimates geo v2

backend/node_modules/restructure/LICENSE

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+MIT License
+
+Copyright (c) 2015-present Devon Govett
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

backend/node_modules/restructure/README.md

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+# Restructure
+
+[![Build Status](https://travis-ci.org/devongovett/restructure.svg?branch=master)](https://travis-ci.org/devongovett/restructure)
+[![Coverage Status](https://coveralls.io/repos/devongovett/restructure/badge.png?branch=master)](https://coveralls.io/r/devongovett/restructure?branch=master)
+
+Restructure allows you to declaratively encode and decode binary data.
+It supports a wide variety of types to enable you to express a multitude
+of binary formats without writing any parsing code.
+
+Some of the supported features are C-like structures, versioned structures,
+pointers, arrays of any type, strings of a large number of encodings, enums,
+bitfields, and more.  See the documentation below for more details.
+
+## Example
+
+This is just a small example of what Restructure can do. Check out the API documentation
+below for more information.
+
+```javascript
+var r = require('restructure');
+
+var Person = new r.Struct({
+  name: new r.String(r.uint8, 'utf8'),
+  age: r.uint8
+});
+
+// decode a person from a buffer
+var stream = new r.DecodeStream(buffer);
+Person.decode(stream); // returns an object with the fields defined above
+
+// encode a person from an object
+// pipe the stream to a destination, such as a file
+var stream = new r.EncodeStream();
+stream.pipe(fs.createWriteStream('out.bin'));
+
+Person.encode(stream, {
+  name: 'Devon',
+  age: 21
+});
+
+stream.end();
+```
+
+
+## API
+
+All of the following types support three standard methods:
+
+* `decode(stream)` - decodes an instance of the type from the given DecodeStream
+* `size(value)` - returns the amount of space the value would take if encoded
+* `encode(stream, value)` - encodes the given value into the given EncodeStream
+
+Restructure supports a wide variety of types, but if you need to write your own for
+some custom use that cannot be represented by them, you can do so by just implementing
+the above methods. Then you can use your type just as you would any other type, in structures
+and whatnot.
+
+### Number Types
+
+The following built-in number types are available:
+
+```javascript
+uint8, uint16, uint24, uint32, int8, int16, int24, int32, float, double, fixed16, fixed32
+```
+
+Numbers are big-endian (network order) by default, but little-endian is supported, too:
+
+```javascript
+uint16le, uint24le, uint32le, int16le, int24le, int32le, floatle, doublele, fixed16le, fixed32le
+```
+
+To avoid ambiguity, big-endian may be used explicitly:
+
+```javascript
+uint16be, uint24be, uint32be, int16be, int24be, int32be, floatbe, doublebe, fixed16be, fixed32be
+```
+
+### Boolean
+
+Booleans are encoded as `0` or `1` using one of the above number types.
+
+```javascript
+var bool = new r.Boolean(r.uint32);
+```
+
+### Reserved
+
+The `Reserved` type simply skips data in a structure, where there are reserved fields.
+Encoding produces zeros.
+
+```javascript
+// 10 reserved uint8s (default is 1)
+var reserved = new r.Reserved(r.uint8, 10);
+```
+
+### Optional
+
+The `Optional` type only encodes or decodes when given condition is truthy.
+
+```javascript
+// includes field
+var optional = new r.Optional(r.uint8, true);
+
+// excludes field
+var optional = new r.Optional(r.uint8, false);
+
+// determine whether field is to be included at runtime with a function
+var optional = new r.Optional(r.uint8, function() {
+  return this.flags & 0x50;
+});
+```
+
+### Enum
+
+The `Enum` type maps a number to the value at that index in an array.
+
+```javascript
+var color = new r.Enum(r.uint8, ['red', 'orange', 'yellow', 'green', 'blue', 'purple']);
+```
+
+### Bitfield
+
+The `Bitfield` type maps a number to an object with boolean keys mapping to each bit in that number,
+as defined in an array.
+
+```javascript
+var bitfield = new r.Bitfield(r.uint8, ['Jack', 'Kack', 'Lack', 'Mack', 'Nack', 'Oack', 'Pack', 'Quack']);
+bitfield.decode(stream);
+
+var result = {
+  Jack: true,
+  Kack: false,
+  Lack: false,
+  Mack: true,
+  Nack: true,
+  Oack: false,
+  Pack: true,
+  Quack: true
+};
+
+bitfield.encode(stream, result);
+```
+
+### Buffer
+
+Extracts a slice of the buffer to a Node `Buffer`.  The length can be a constant, or taken from
+a previous field in the parent structure.
+
+```javascript
+// fixed length
+var buf = new r.Buffer(2);
+
+// length from parent structure
+var struct = new r.Struct({
+  bufLen: r.uint8,
+  buf: new r.Buffer('bufLen')
+});
+```
+
+### String
+
+A `String` maps a JavaScript string to and from binary encodings.  The length can be a constant, taken
+from a previous field in the parent structure, or encoded using a number type immediately before the string.
+
+Supported encodings include `'ascii'`, `'utf8'`, `'ucs2'`, `'utf16le'`, `'utf16be'`, and if you also install
+[iconv-lite](https://github.com/ashtuchkin/iconv-lite), many other legacy codecs.
+
+```javascript
+// fixed length, ascii encoding by default
+var str = new r.String(2);
+
+// length encoded as number before the string, utf8 encoding
+var str = new r.String(r.uint8, 'utf8');
+
+// length from parent structure
+var struct = new r.Struct({
+  len: r.uint8,
+  str: new r.String('len', 'utf16be')
+});
+
+// null-terminated string (also known as C string)
+var str = new r.String(null, 'utf8')
+```
+
+### Array
+
+An `Array` maps to and from a JavaScript array containing instances of a sub-type. The length can be a constant,
+taken from a previous field in the parent structure, encoded using a number type immediately
+before the string, or computed by a function.
+
+```javascript
+// fixed length, containing numbers
+var arr = new r.Array(r.uint16, 2);
+
+// length encoded as number before the array containing strings
+var arr = new r.Array(new r.String(10), r.uint8);
+
+// length computed by a function
+var arr = new r.Array(r.uint8, function() { return 5 });
+
+// length from parent structure
+var struct = new r.Struct({
+  len: r.uint8,
+  arr: new r.Array(r.uint8, 'len')
+});
+
+// treat as amount of bytes instead (may be used in all the above scenarios)
+var arr = new r.Array(r.uint16, 6, 'bytes');
+```
+
+### LazyArray
+
+The `LazyArray` type extends from the `Array` type, and is useful for large arrays that you do not need to access sequentially.
+It avoids decoding the entire array upfront, and instead only decodes and caches individual items as needed. It only works when
+the elements inside the array have a fixed size.
+
+Instead of returning a JavaScript array, the `LazyArray` type returns a custom object that can be used to access the elements.
+
+```javascript
+var arr = new r.LazyArray(r.uint16, 2048);
+var res = arr.decode(stream);
+
+// get a single element
+var el = res.get(2);
+
+// convert to a normal array (decode all elements)
+var array = res.toArray();
+```
+
+### Struct
+
+A `Struct` maps to and from JavaScript objects, containing keys of various previously discussed types. Sub structures,
+arrays of structures, and pointers to other types (discussed below) are supported.
+
+```javascript
+var Person = new r.Struct({
+  name: new r.String(r.uint8, 'utf8'),
+  age: r.uint8
+});
+```
+
+### VersionedStruct
+
+A `VersionedStruct` is a `Struct` that has multiple versions. The version is typically encoded at
+the beginning of the structure, or as a field in a parent structure. There is an optional `header`
+common to all versions, and separate fields listed for each version number.
+
+```javascript
+// the version is read as a uint8 in this example
+// you could also get the version from a key on the parent struct
+var Person = new r.VersionedStruct(r.uint8, {
+  // optional header common to all versions
+  header: {
+    name: new r.String(r.uint8, 'utf8')
+  },
+  0: {
+    age: r.uint8
+  },
+  1: {
+    hairColor: r.Enum(r.uint8, ['black', 'brown', 'blonde'])
+  }
+});
+```
+
+### Pointer
+
+Pointers map an address or offset encoded as a number, to a value encoded elsewhere in the buffer.
+There are a few options you can use: `type`, `relativeTo`, `allowNull`, and `nullValue`.
+The `type` option has these possible values:
+
+* `local` (default) - the encoded offset is relative to the start of the containing structure
+* `immediate` - the encoded offset is relative to the position of the pointer itself
+* `parent` - the encoded offset is relative to the parent structure of the immediate container
+* `global` - the encoded offset is global to the start of the file
+
+The `relativeTo` option accepts a function callback that should return the field on the containing structure which the encoded offset is relative to. The callback is called with the context as parameter.
+By default, pointers are relative to the start of the containing structure (`local`).
+
+The `allowNull` option lets you specify whether zero offsets are allowed or should produce `null`. This is
+set to `true` by default. The `nullValue` option is related, and lets you override the encoded value that
+represents `null`. By default, the `nullValue` is zero.
+
+The `lazy` option allows lazy decoding of the pointer's value by defining a getter on the parent object.
+This only works when the pointer is contained within a Struct, but can be used to speed up decoding
+quite a bit when not all of the data is needed right away.
+
+```javascript
+var Address = new r.Struct({
+  street: new r.String(r.uint8),
+  zip: new r.String(5)
+});
+
+var Person = new r.Struct({
+  name: new r.String(r.uint8, 'utf8'),
+  age: r.uint8,
+  ptrStart: r.uint8,
+  address: new r.Pointer(r.uint8, Address)
+});
+```
+
+If the type of a pointer is set to 'void', it is not decoded and the computed address in the buffer
+is simply returned. To encode a void pointer, create a `new r.VoidPointer(type, value)`.
+
+## License
+
+MIT

backend/node_modules/restructure/index.js

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+exports.EncodeStream    = require('./src/EncodeStream');
+exports.DecodeStream    = require('./src/DecodeStream');
+exports.Array           = require('./src/Array');
+exports.LazyArray       = require('./src/LazyArray');
+exports.Bitfield        = require('./src/Bitfield');
+exports.Boolean         = require('./src/Boolean');
+exports.Buffer          = require('./src/Buffer');
+exports.Enum            = require('./src/Enum');
+exports.Optional        = require('./src/Optional');
+exports.Reserved        = require('./src/Reserved');
+exports.String          = require('./src/String');
+exports.Struct          = require('./src/Struct');
+exports.VersionedStruct = require('./src/VersionedStruct');
+
+const utils             = require('./src/utils');
+const NumberT           = require('./src/Number');
+const Pointer           = require('./src/Pointer');
+
+Object.assign(exports, utils, NumberT, Pointer);

backend/node_modules/restructure/package.json

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+{
+  "name": "restructure",
+  "version": "2.0.1",
+  "description": "Declaratively encode and decode binary data",
+  "main": "index.js",
+  "devDependencies": {
+    "chai": "~4.2.0",
+    "concat-stream": "~2.0.0",
+    "coveralls": "^3.0.11",
+    "iconv-lite": "^0.5.1",
+    "mocha": "~7.1.1",
+    "nyc": "^15.0.1"
+  },
+  "scripts": {
+    "test": "mocha --reporter spec",
+    "cover": "nyc --reporter=html --reporter=text mocha",
+    "coveralls": "nyc report --reporter=text-lcov | coveralls"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/devongovett/restructure.git"
+  },
+  "keywords": [
+    "binary",
+    "struct",
+    "encode",
+    "decode"
+  ],
+  "author": "Devon Govett <devongovett@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/devongovett/restructure/issues"
+  },
+  "homepage": "https://github.com/devongovett/restructure"
+}

backend/node_modules/restructure/src/Array.js

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+const {Number:NumberT} = require('./Number');
+const utils = require('./utils');
+
+class ArrayT {
+  constructor(type, length, lengthType = 'count') {
+    this.type = type;
+    this.length = length;
+    this.lengthType = lengthType;
+  }
+
+  decode(stream, parent) {
+    let length;
+    const { pos } = stream;
+
+    const res = [];
+    let ctx = parent;
+
+    if (this.length != null) {
+      length = utils.resolveLength(this.length, stream, parent);
+    }
+
+    if (this.length instanceof NumberT) {
+      // define hidden properties
+      Object.defineProperties(res, {
+        parent:         { value: parent },
+        _startOffset:   { value: pos },
+        _currentOffset: { value: 0, writable: true },
+        _length:        { value: length }
+      });
+
+      ctx = res;
+    }
+
+    if ((length == null) || (this.lengthType === 'bytes')) {
+      const target = (length != null) ?
+        stream.pos + length
+      : (parent != null ? parent._length : undefined) ?
+        parent._startOffset + parent._length
+      :
+        stream.length;
+
+      while (stream.pos < target) {
+        res.push(this.type.decode(stream, ctx));
+      }
+
+    } else {
+      for (let i = 0, end = length; i < end; i++) {
+        res.push(this.type.decode(stream, ctx));
+      }
+    }
+
+    return res;
+  }
+
+  size(array, ctx) {
+    if (!array) {
+      return this.type.size(null, ctx) * utils.resolveLength(this.length, null, ctx);
+    }
+
+    let size = 0;
+    if (this.length instanceof NumberT) {
+      size += this.length.size();
+      ctx = {parent: ctx};
+    }
+
+    for (let item of array) {
+      size += this.type.size(item, ctx);
+    }
+
+    return size;
+  }
+
+  encode(stream, array, parent) {
+    let ctx = parent;
+    if (this.length instanceof NumberT) {
+      ctx = {
+        pointers: [],
+        startOffset: stream.pos,
+        parent
+      };
+
+      ctx.pointerOffset = stream.pos + this.size(array, ctx);
+      this.length.encode(stream, array.length);
+    }
+
+    for (let item of array) {
+      this.type.encode(stream, item, ctx);
+    }
+
+    if (this.length instanceof NumberT) {
+      let i = 0;
+      while (i < ctx.pointers.length) {
+        const ptr = ctx.pointers[i++];
+        ptr.type.encode(stream, ptr.val);
+      }
+    }
+
+  }
+}
+
+module.exports = ArrayT;

backend/node_modules/restructure/src/Bitfield.js

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+class Bitfield {
+  constructor(type, flags = []) {
+    this.type = type;
+    this.flags = flags;
+  }
+  decode(stream) {
+    const val = this.type.decode(stream);
+
+    const res = {};
+    for (let i = 0; i < this.flags.length; i++) {
+      const flag = this.flags[i];
+      if (flag != null) {
+        res[flag] = !!(val & (1 << i));
+      }
+    }
+
+    return res;
+  }
+
+  size() {
+    return this.type.size();
+  }
+
+  encode(stream, keys) {
+    let val = 0;
+    for (let i = 0; i < this.flags.length; i++) {
+      const flag = this.flags[i];
+      if (flag != null) {
+        if (keys[flag]) { val |= (1 << i); }
+      }
+    }
+
+    return this.type.encode(stream, val);
+  }
+}
+
+module.exports = Bitfield;

backend/node_modules/restructure/src/Boolean.js

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+class BooleanT {
+  constructor(type) {
+    this.type = type;
+  }
+
+  decode(stream, parent) {
+    return !!this.type.decode(stream, parent);
+  }
+
+  size(val, parent) {
+    return this.type.size(val, parent);
+  }
+
+  encode(stream, val, parent) {
+    return this.type.encode(stream, +val, parent);
+  }
+}
+
+module.exports = BooleanT;

backend/node_modules/restructure/src/Buffer.js

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+const utils = require('./utils');
+const {Number:NumberT} = require('./Number');
+
+class BufferT {
+  constructor(length) {
+    this.length = length;
+  }
+  decode(stream, parent) {
+    const length = utils.resolveLength(this.length, stream, parent);
+    return stream.readBuffer(length);
+  }
+
+  size(val, parent) {
+    if (!val) {
+      return utils.resolveLength(this.length, null, parent);
+    }
+
+    return val.length;
+  }
+
+  encode(stream, buf, parent) {
+    if (this.length instanceof NumberT) {
+      this.length.encode(stream, buf.length);
+    }
+
+    return stream.writeBuffer(buf);
+  }
+}
+
+module.exports = BufferT;

backend/node_modules/restructure/src/DecodeStream.js

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+let iconv;
+try { iconv = require('iconv-lite'); } catch (error) {}
+
+class DecodeStream {
+  constructor(buffer) {
+    this.buffer = buffer;
+    this.pos = 0;
+    this.length = this.buffer.length;
+  }
+
+  readString(length, encoding = 'ascii') {
+    switch (encoding) {
+      case 'utf16le': case 'ucs2': case 'utf8': case 'ascii':
+        return this.buffer.toString(encoding, this.pos, (this.pos += length));
+
+      case 'utf16be':
+        var buf = Buffer.from(this.readBuffer(length));
+
+        // swap the bytes
+        for (let i = 0, end = buf.length - 1; i < end; i += 2) {
+          const byte = buf[i];
+          buf[i] = buf[i + 1];
+          buf[i + 1] = byte;
+        }
+
+        return buf.toString('utf16le');
+
+      default:
+        buf = this.readBuffer(length);
+        if (iconv) {
+          try {
+            return iconv.decode(buf, encoding);
+          } catch (error1) {}
+        }
+
+        return buf;
+    }
+  }
+
+  readBuffer(length) {
+    return this.buffer.slice(this.pos, (this.pos += length));
+  }
+
+  readUInt24BE() {
+    return (this.readUInt16BE() << 8) + this.readUInt8();
+  }
+
+  readUInt24LE() {
+    return this.readUInt16LE() + (this.readUInt8() << 16);
+  }
+
+  readInt24BE() {
+    return (this.readInt16BE() << 8) + this.readUInt8();
+  }
+
+  readInt24LE() {
+    return this.readUInt16LE() + (this.readInt8() << 16);
+  }
+}
+
+DecodeStream.TYPES = {
+  UInt8: 1,
+  UInt16: 2,
+  UInt24: 3,
+  UInt32: 4,
+  Int8: 1,
+  Int16: 2,
+  Int24: 3,
+  Int32: 4,
+  Float: 4,
+  Double: 8
+};
+
+for (let key in Buffer.prototype) {
+  if (key.slice(0, 4) === 'read') {
+    const bytes = DecodeStream.TYPES[key.replace(/read|[BL]E/g, '')];
+    DecodeStream.prototype[key] = function() {
+      const ret = this.buffer[key](this.pos);
+      this.pos += bytes;
+      return ret;
+    };
+  }
+}
+
+module.exports = DecodeStream;

backend/node_modules/restructure/src/EncodeStream.js

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+let iconv;
+const stream = require('stream');
+const DecodeStream = require('./DecodeStream');
+try { iconv = require('iconv-lite'); } catch (error) {}
+
+class EncodeStream extends stream.Readable {
+  constructor(bufferSize =  65536) {
+    super(...arguments);
+    this.buffer = Buffer.alloc(bufferSize);
+    this.bufferOffset = 0;
+    this.pos = 0;
+  }
+
+  // do nothing, required by node
+  _read() {}
+
+  ensure(bytes) {
+    if ((this.bufferOffset + bytes) > this.buffer.length) {
+      return this.flush();
+    }
+  }
+
+  flush() {
+    if (this.bufferOffset > 0) {
+      this.push(Buffer.from(this.buffer.slice(0, this.bufferOffset)));
+      return this.bufferOffset = 0;
+    }
+  }
+
+  writeBuffer(buffer) {
+    this.flush();
+    this.push(buffer);
+    return this.pos += buffer.length;
+  }
+
+  writeString(string, encoding = 'ascii') {
+    switch (encoding) {
+      case 'utf16le': case 'ucs2': case 'utf8': case 'ascii':
+        return this.writeBuffer(Buffer.from(string, encoding));
+
+      case 'utf16be':
+        var buf = Buffer.from(string, 'utf16le');
+
+        // swap the bytes
+        for (let i = 0, end = buf.length - 1; i < end; i += 2) {
+          const byte = buf[i];
+          buf[i] = buf[i + 1];
+          buf[i + 1] = byte;
+        }
+
+        return this.writeBuffer(buf);
+
+      default:
+        if (iconv) {
+          return this.writeBuffer(iconv.encode(string, encoding));
+        } else {
+          throw new Error('Install iconv-lite to enable additional string encodings.');
+        }
+    }
+  }
+
+  writeUInt24BE(val) {
+    this.ensure(3);
+    this.buffer[this.bufferOffset++] = (val >>> 16) & 0xff;
+    this.buffer[this.bufferOffset++] = (val >>> 8)  & 0xff;
+    this.buffer[this.bufferOffset++] = val & 0xff;
+    return this.pos += 3;
+  }
+
+  writeUInt24LE(val) {
+    this.ensure(3);
+    this.buffer[this.bufferOffset++] = val & 0xff;
+    this.buffer[this.bufferOffset++] = (val >>> 8) & 0xff;
+    this.buffer[this.bufferOffset++] = (val >>> 16) & 0xff;
+    return this.pos += 3;
+  }
+
+  writeInt24BE(val) {
+    if (val >= 0) {
+      return this.writeUInt24BE(val);
+    } else {
+      return this.writeUInt24BE(val + 0xffffff + 1);
+    }
+  }
+
+  writeInt24LE(val) {
+    if (val >= 0) {
+      return this.writeUInt24LE(val);
+    } else {
+      return this.writeUInt24LE(val + 0xffffff + 1);
+    }
+  }
+
+  fill(val, length) {
+    if (length < this.buffer.length) {
+      this.ensure(length);
+      this.buffer.fill(val, this.bufferOffset, this.bufferOffset + length);
+      this.bufferOffset += length;
+      return this.pos += length;
+    } else {
+      const buf = Buffer.alloc(length);
+      buf.fill(val);
+      return this.writeBuffer(buf);
+    }
+  }
+
+  end() {
+    this.flush();
+    return this.push(null);
+  }
+}
+
+for (let key in Buffer.prototype) {
+  if (key.slice(0, 5) === 'write') {
+    const bytes = +DecodeStream.TYPES[key.replace(/write|[BL]E/g, '')];
+    EncodeStream.prototype[key] = function(value) {
+      this.ensure(bytes);
+      this.buffer[key](value, this.bufferOffset);
+      this.bufferOffset += bytes;
+      return this.pos += bytes;
+    };
+  }
+}
+
+module.exports = EncodeStream;

backend/node_modules/restructure/src/Enum.js

@@ -0,0 +1,25 @@
+class Enum {
+  constructor(type, options = []) {
+    this.type = type;
+    this.options = options;
+  }
+  decode(stream) {
+    const index = this.type.decode(stream);
+    return this.options[index] || index;
+  }
+
+  size() {
+    return this.type.size();
+  }
+
+  encode(stream, val) {
+    const index = this.options.indexOf(val);
+    if (index === -1) {
+      throw new Error(`Unknown option in enum: ${val}`);
+    }
+
+    return this.type.encode(stream, index);
+  }
+}
+
+module.exports = Enum;

backend/node_modules/restructure/src/LazyArray.js

@@ -0,0 +1,81 @@
+const ArrayT = require('./Array');
+const {Number:NumberT} = require('./Number');
+const utils = require('./utils');
+const {inspect} = require('util');
+
+class LazyArrayT extends ArrayT {
+  decode(stream, parent) {
+    const { pos } = stream;
+    const length = utils.resolveLength(this.length, stream, parent);
+
+    if (this.length instanceof NumberT) {
+      parent = {
+        parent,
+        _startOffset: pos,
+        _currentOffset: 0,
+        _length: length
+      };
+    }
+
+    const res = new LazyArray(this.type, length, stream, parent);
+
+    stream.pos += length * this.type.size(null, parent);
+    return res;
+  }
+
+  size(val, ctx) {
+    if (val instanceof LazyArray) {
+      val = val.toArray();
+    }
+
+    return super.size(val, ctx);
+  }
+
+  encode(stream, val, ctx) {
+    if (val instanceof LazyArray) {
+      val = val.toArray();
+    }
+
+    return super.encode(stream, val, ctx);
+  }
+}
+
+class LazyArray {
+  constructor(type, length, stream, ctx) {
+    this.type = type;
+    this.length = length;
+    this.stream = stream;
+    this.ctx = ctx;
+    this.base = this.stream.pos;
+    this.items = [];
+  }
+
+  get(index) {
+    if ((index < 0) || (index >= this.length)) {
+      return undefined;
+    }
+
+    if (this.items[index] == null) {
+      const { pos } = this.stream;
+      this.stream.pos = this.base + (this.type.size(null, this.ctx) * index);
+      this.items[index] = this.type.decode(this.stream, this.ctx);
+      this.stream.pos = pos;
+    }
+
+    return this.items[index];
+  }
+
+  toArray() {
+    const result = [];
+    for (let i = 0, end = this.length; i < end; i++) {
+      result.push(this.get(i));
+    }
+    return result;
+  }
+
+  inspect() {
+    return inspect(this.toArray());
+  }
+}
+
+module.exports = LazyArrayT;

backend/node_modules/restructure/src/Number.js

@@ -0,0 +1,65 @@
+const DecodeStream = require('./DecodeStream');
+
+class NumberT {
+  constructor(type, endian = 'BE') {
+    this.type = type;
+    this.endian = endian;
+    this.fn = this.type;
+    if (this.type[this.type.length - 1] !== '8') {
+      this.fn += this.endian;
+    }
+  }
+
+  size() {
+    return DecodeStream.TYPES[this.type];
+  }
+
+  decode(stream) {
+    return stream[`read${this.fn}`]();
+  }
+
+  encode(stream, val) {
+    return stream[`write${this.fn}`](val);
+  }
+}
+
+exports.Number = NumberT;
+exports.uint8 = new NumberT('UInt8');
+exports.uint16be = (exports.uint16 = new NumberT('UInt16', 'BE'));
+exports.uint16le = new NumberT('UInt16', 'LE');
+exports.uint24be = (exports.uint24 = new NumberT('UInt24', 'BE'));
+exports.uint24le = new NumberT('UInt24', 'LE');
+exports.uint32be = (exports.uint32 = new NumberT('UInt32', 'BE'));
+exports.uint32le = new NumberT('UInt32', 'LE');
+exports.int8 = new NumberT('Int8');
+exports.int16be = (exports.int16 = new NumberT('Int16', 'BE'));
+exports.int16le = new NumberT('Int16', 'LE');
+exports.int24be = (exports.int24 = new NumberT('Int24', 'BE'));
+exports.int24le = new NumberT('Int24', 'LE');
+exports.int32be = (exports.int32 = new NumberT('Int32', 'BE'));
+exports.int32le = new NumberT('Int32', 'LE');
+exports.floatbe = (exports.float = new NumberT('Float', 'BE'));
+exports.floatle = new NumberT('Float', 'LE');
+exports.doublebe = (exports.double = new NumberT('Double', 'BE'));
+exports.doublele = new NumberT('Double', 'LE');
+
+class Fixed extends NumberT {
+  constructor(size, endian, fracBits = size >> 1) {
+    super(`Int${size}`, endian);
+    this._point = 1 << fracBits;
+  }
+
+  decode(stream) {
+    return super.decode(stream) / this._point;
+  }
+
+  encode(stream, val) {
+    return super.encode(stream, (val * this._point) | 0);
+  }
+}
+
+exports.Fixed = Fixed;
+exports.fixed16be = (exports.fixed16 = new Fixed(16, 'BE'));
+exports.fixed16le = new Fixed(16, 'LE');
+exports.fixed32be = (exports.fixed32 =new Fixed(32, 'BE'));
+exports.fixed32le = new Fixed(32, 'LE');

backend/node_modules/restructure/src/Optional.js

@@ -0,0 +1,43 @@
+class Optional {
+  constructor(type, condition = true) {
+    this.type = type;
+    this.condition = condition;
+  }
+
+  decode(stream, parent) {
+    let { condition } = this;
+    if (typeof condition === 'function') {
+      condition = condition.call(parent, parent);
+    }
+
+    if (condition) {
+      return this.type.decode(stream, parent);
+    }
+  }
+
+  size(val, parent) {
+    let { condition } = this;
+    if (typeof condition === 'function') {
+      condition = condition.call(parent, parent);
+    }
+
+    if (condition) {
+      return this.type.size(val, parent);
+    } else {
+      return 0;
+    }
+  }
+
+  encode(stream, val, parent) {
+    let { condition } = this;
+    if (typeof condition === 'function') {
+      condition = condition.call(parent, parent);
+    }
+
+    if (condition) {
+      return this.type.encode(stream, val, parent);
+    }
+  }
+}
+
+module.exports = Optional;

backend/node_modules/restructure/src/Pointer.js

@@ -0,0 +1,166 @@
+const utils = require('./utils');
+
+class Pointer {
+  constructor(offsetType, type, options = {}) {
+    this.offsetType = offsetType;
+    this.type = type;
+    this.options = options;
+    if (this.type === 'void') { this.type = null; }
+    if (this.options.type == null) { this.options.type = 'local'; }
+    if (this.options.allowNull == null) { this.options.allowNull = true; }
+    if (this.options.nullValue == null) { this.options.nullValue = 0; }
+    if (this.options.lazy == null) { this.options.lazy = false; }
+    if (this.options.relativeTo) {
+      if (typeof this.options.relativeTo !== 'function') {
+        throw new Error('relativeTo option must be a function');
+      }
+      this.relativeToGetter = options.relativeTo;
+    }
+  }
+
+  decode(stream, ctx) {
+    const offset = this.offsetType.decode(stream, ctx);
+
+    // handle NULL pointers
+    if ((offset === this.options.nullValue) && this.options.allowNull) {
+      return null;
+    }
+
+    let relative;
+    switch (this.options.type) {
+      case 'local':     relative = ctx._startOffset; break;
+      case 'immediate': relative = stream.pos - this.offsetType.size(); break;
+      case 'parent':    relative = ctx.parent._startOffset; break;
+      default:
+        var c = ctx;
+        while (c.parent) {
+          c = c.parent;
+        }
+
+        relative = c._startOffset || 0;
+    }
+
+    if (this.options.relativeTo) {
+      relative += this.relativeToGetter(ctx);
+    }
+
+    const ptr = offset + relative;
+
+    if (this.type != null) {
+      let val = null;
+      const decodeValue = () => {
+        if (val != null) { return val; }
+
+        const { pos } = stream;
+        stream.pos = ptr;
+        val = this.type.decode(stream, ctx);
+        stream.pos = pos;
+        return val;
+      };
+
+      // If this is a lazy pointer, define a getter to decode only when needed.
+      // This obviously only works when the pointer is contained by a Struct.
+      if (this.options.lazy) {
+        return new utils.PropertyDescriptor({
+          get: decodeValue});
+      }
+
+      return decodeValue();
+    } else {
+      return ptr;
+    }
+  }
+
+  size(val, ctx) {
+    const parent = ctx;
+    switch (this.options.type) {
+      case 'local': case 'immediate':
+        break;
+      case 'parent':
+        ctx = ctx.parent;
+        break;
+      default: // global
+        while (ctx.parent) {
+          ctx = ctx.parent;
+        }
+    }
+
+    let { type } = this;
+    if (type == null) {
+      if (!(val instanceof VoidPointer)) {
+        throw new Error("Must be a VoidPointer");
+      }
+
+      ({ type } = val);
+      val = val.value;
+    }
+
+    if (val && ctx) {
+      ctx.pointerSize += type.size(val, parent);
+    }
+
+    return this.offsetType.size();
+  }
+
+  encode(stream, val, ctx) {
+    let relative;
+    const parent = ctx;
+    if ((val == null)) {
+      this.offsetType.encode(stream, this.options.nullValue);
+      return;
+    }
+
+    switch (this.options.type) {
+      case 'local':
+        relative = ctx.startOffset;
+        break;
+      case 'immediate':
+        relative = stream.pos + this.offsetType.size(val, parent);
+        break;
+      case 'parent':
+        ctx = ctx.parent;
+        relative = ctx.startOffset;
+        break;
+      default: // global
+        relative = 0;
+        while (ctx.parent) {
+          ctx = ctx.parent;
+        }
+    }
+
+    if (this.options.relativeTo) {
+      relative += this.relativeToGetter(parent.val);
+    }
+
+    this.offsetType.encode(stream, ctx.pointerOffset - relative);
+
+    let { type } = this;
+    if (type == null) {
+      if (!(val instanceof VoidPointer)) {
+        throw new Error("Must be a VoidPointer");
+      }
+
+      ({ type } = val);
+      val = val.value;
+    }
+
+    ctx.pointers.push({
+      type,
+      val,
+      parent
+    });
+
+    return ctx.pointerOffset += type.size(val, parent);
+  }
+}
+
+// A pointer whose type is determined at decode time
+class VoidPointer {
+  constructor(type, value) {
+    this.type = type;
+    this.value = value;
+  }
+}
+
+exports.Pointer = Pointer;
+exports.VoidPointer = VoidPointer;

backend/node_modules/restructure/src/Reserved.js

@@ -0,0 +1,23 @@
+const utils = require('./utils');
+
+class Reserved {
+  constructor(type, count = 1) {
+    this.type = type;
+    this.count = count;
+  }
+  decode(stream, parent) {
+    stream.pos += this.size(null, parent);
+    return undefined;
+  }
+
+  size(data, parent) {
+    const count = utils.resolveLength(this.count, null, parent);
+    return this.type.size() * count;
+  }
+
+  encode(stream, val, parent) {
+    return stream.fill(0, this.size(val, parent));
+  }
+}
+
+module.exports = Reserved;

backend/node_modules/restructure/src/String.js

@@ -0,0 +1,85 @@
+const {Number:NumberT} = require('./Number');
+const utils = require('./utils');
+
+class StringT {
+  constructor(length, encoding = 'ascii') {
+    this.length = length;
+    this.encoding = encoding;
+  }
+
+  decode(stream, parent) {
+    let length, pos;
+
+    if (this.length != null) {
+      length = utils.resolveLength(this.length, stream, parent);
+    } else {
+      let buffer;
+      ({buffer, length, pos} = stream);
+
+      while ((pos < length) && (buffer[pos] !== 0x00)) {
+        ++pos;
+      }
+
+      length = pos - stream.pos;
+    }
+
+    let { encoding } = this;
+    if (typeof encoding === 'function') {
+      encoding = encoding.call(parent, parent) || 'ascii';
+    }
+
+    const string = stream.readString(length, encoding);
+
+    if ((this.length == null) && (stream.pos < stream.length)) {
+      stream.pos++;
+    }
+
+    return string;
+  }
+
+  size(val, parent) {
+    // Use the defined value if no value was given
+    if (!val) {
+      return utils.resolveLength(this.length, null, parent);
+    }
+
+    let { encoding } = this;
+    if (typeof encoding === 'function') {
+      encoding = encoding.call(parent != null ? parent.val : undefined, parent != null ? parent.val : undefined) || 'ascii';
+    }
+
+    if (encoding === 'utf16be') {
+      encoding = 'utf16le';
+    }
+
+    let size = Buffer.byteLength(val, encoding);
+    if (this.length instanceof NumberT) {
+      size += this.length.size();
+    }
+
+    if ((this.length == null)) {
+      size++;
+    }
+
+    return size;
+  }
+
+  encode(stream, val, parent) {
+    let { encoding } = this;
+    if (typeof encoding === 'function') {
+      encoding = encoding.call(parent != null ? parent.val : undefined, parent != null ? parent.val : undefined) || 'ascii';
+    }
+
+    if (this.length instanceof NumberT) {
+      this.length.encode(stream, Buffer.byteLength(val, encoding));
+    }
+
+    stream.writeString(val, encoding);
+
+    if ((this.length == null)) {
+      return stream.writeUInt8(0x00);
+    }
+  }
+}
+
+module.exports = StringT;

backend/node_modules/restructure/src/Struct.js

@@ -0,0 +1,111 @@
+const utils = require('./utils');
+
+class Struct {
+  constructor(fields = {}) {
+    this.fields = fields;
+  }
+
+  decode(stream, parent, length = 0) {
+    const res = this._setup(stream, parent, length);
+    this._parseFields(stream, res, this.fields);
+
+    if (this.process != null) {
+      this.process.call(res, stream);
+    }
+    return res;
+  }
+
+  _setup(stream, parent, length) {
+    const res = {};
+
+    // define hidden properties
+    Object.defineProperties(res, {
+      parent:         { value: parent },
+      _startOffset:   { value: stream.pos },
+      _currentOffset: { value: 0, writable: true },
+      _length:        { value: length }
+    });
+
+    return res;
+  }
+
+  _parseFields(stream, res, fields) {
+    for (let key in fields) {
+      var val;
+      const type = fields[key];
+      if (typeof type === 'function') {
+        val = type.call(res, res);
+      } else {
+        val = type.decode(stream, res);
+      }
+
+      if (val !== undefined) {
+        if (val instanceof utils.PropertyDescriptor) {
+          Object.defineProperty(res, key, val);
+        } else {
+          res[key] = val;
+        }
+      }
+
+      res._currentOffset = stream.pos - res._startOffset;
+    }
+
+  }
+
+  size(val, parent, includePointers) {
+    if (val == null) { val = {}; }
+    if (includePointers == null) { includePointers = true; }
+    const ctx = {
+      parent,
+      val,
+      pointerSize: 0
+    };
+
+    let size = 0;
+    for (let key in this.fields) {
+      const type = this.fields[key];
+      if (type.size != null) {
+        size += type.size(val[key], ctx);
+      }
+    }
+
+    if (includePointers) {
+      size += ctx.pointerSize;
+    }
+
+    return size;
+  }
+
+  encode(stream, val, parent) {
+    let type;
+    if (this.preEncode != null) {
+      this.preEncode.call(val, stream);
+    }
+
+    const ctx = {
+      pointers: [],
+      startOffset: stream.pos,
+      parent,
+      val,
+      pointerSize: 0
+    };
+
+    ctx.pointerOffset = stream.pos + this.size(val, ctx, false);
+
+    for (let key in this.fields) {
+      type = this.fields[key];
+      if (type.encode != null) {
+        type.encode(stream, val[key], ctx);
+      }
+    }
+
+    let i = 0;
+    while (i < ctx.pointers.length) {
+      const ptr = ctx.pointers[i++];
+      ptr.type.encode(stream, ptr.val, ptr.parent);
+    }
+
+  }
+}
+
+module.exports = Struct;

backend/node_modules/restructure/src/VersionedStruct.js

@@ -0,0 +1,138 @@
+const Struct = require('./Struct');
+
+const getPath = (object, pathArray) => {
+  return pathArray.reduce((prevObj, key) => prevObj && prevObj[key], object);
+};
+
+class VersionedStruct extends Struct {
+  constructor(type, versions = {}) {
+    super();
+    this.type = type;
+    this.versions = versions;
+    if (typeof type === 'string') {
+      this.versionPath = type.split('.');
+    }
+  }
+
+  decode(stream, parent, length = 0) {
+    const res = this._setup(stream, parent, length);
+
+    if (typeof this.type === 'string') {
+      res.version = getPath(parent, this.versionPath);
+    } else {
+      res.version = this.type.decode(stream);
+    }
+
+    if (this.versions.header) {
+      this._parseFields(stream, res, this.versions.header);
+    }
+
+    const fields = this.versions[res.version];
+    if ((fields == null)) {
+      throw new Error(`Unknown version ${res.version}`);
+    }
+
+    if (fields instanceof VersionedStruct) {
+      return fields.decode(stream, parent);
+    }
+
+    this._parseFields(stream, res, fields);
+
+    if (this.process != null) {
+      this.process.call(res, stream);
+    }
+    return res;
+  }
+
+  size(val, parent, includePointers = true) {
+    let key, type;
+    if (!val) {
+      throw new Error('Not a fixed size');
+    }
+
+    const ctx = {
+      parent,
+      val,
+      pointerSize: 0
+    };
+
+    let size = 0;
+    if (typeof this.type !== 'string') {
+      size += this.type.size(val.version, ctx);
+    }
+
+    if (this.versions.header) {
+      for (key in this.versions.header) {
+        type = this.versions.header[key];
+        if (type.size != null) {
+          size += type.size(val[key], ctx);
+        }
+      }
+    }
+
+    const fields = this.versions[val.version];
+    if ((fields == null)) {
+      throw new Error(`Unknown version ${val.version}`);
+    }
+
+    for (key in fields) {
+      type = fields[key];
+      if (type.size != null) {
+        size += type.size(val[key], ctx);
+      }
+    }
+
+    if (includePointers) {
+      size += ctx.pointerSize;
+    }
+
+    return size;
+  }
+
+  encode(stream, val, parent) {
+    let key, type;
+    if (this.preEncode != null) {
+      this.preEncode.call(val, stream);
+    }
+
+    const ctx = {
+      pointers: [],
+      startOffset: stream.pos,
+      parent,
+      val,
+      pointerSize: 0
+    };
+
+    ctx.pointerOffset = stream.pos + this.size(val, ctx, false);
+
+    if (typeof this.type !== 'string') {
+      this.type.encode(stream, val.version);
+    }
+
+    if (this.versions.header) {
+      for (key in this.versions.header) {
+        type = this.versions.header[key];
+        if (type.encode != null) {
+          type.encode(stream, val[key], ctx);
+        }
+      }
+    }
+
+    const fields = this.versions[val.version];
+    for (key in fields) {
+      type = fields[key];
+      if (type.encode != null) {
+        type.encode(stream, val[key], ctx);
+      }
+    }
+
+    let i = 0;
+    while (i < ctx.pointers.length) {
+      const ptr = ctx.pointers[i++];
+      ptr.type.encode(stream, ptr.val, ptr.parent);
+    }
+
+  }
+}
+
+module.exports = VersionedStruct;

backend/node_modules/restructure/src/utils.js

@@ -0,0 +1,37 @@
+const {Number:NumberT} = require('./Number');
+
+exports.resolveLength = function(length, stream, parent) {
+  let res;
+  if (typeof length === 'number') {
+    res = length;
+
+  } else if (typeof length === 'function') {
+    res = length.call(parent, parent);
+
+  } else if (parent && (typeof length === 'string')) {
+    res = parent[length];
+
+  } else if (stream && length instanceof NumberT) {
+    res = length.decode(stream);
+  }
+
+  if (isNaN(res)) {
+    throw new Error('Not a fixed size');
+  }
+
+  return res;
+};
+
+class PropertyDescriptor {
+  constructor(opts = {}) {
+    this.enumerable = true;
+    this.configurable = true;
+
+    for (let key in opts) {
+      const val = opts[key];
+      this[key] = val;
+    }
+  }
+}
+
+exports.PropertyDescriptor = PropertyDescriptor;

backend/node_modules/restructure/test/Array.js

@@ -0,0 +1,125 @@
+const {Array:ArrayT, Pointer, uint8, uint16, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Array', function() {
+  describe('decode', function() {
+    it('should decode fixed length', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint8, 4);
+      return array.decode(stream).should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should decode fixed amount of bytes', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint16, 4, 'bytes');
+      return array.decode(stream).should.deep.equal([258, 772]);
+  });
+
+    it('should decode length from parent key', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint8, 'len');
+      return array.decode(stream, {len: 4}).should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should decode amount of bytes from parent key', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint16, 'len', 'bytes');
+      return array.decode(stream, {len: 4}).should.deep.equal([258, 772]);
+  });
+
+    it('should decode length as number before array', function() {
+      const stream = new DecodeStream(Buffer.from([4, 1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint8, uint8);
+      return array.decode(stream).should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should decode amount of bytes as number before array', function() {
+      const stream = new DecodeStream(Buffer.from([4, 1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint16, uint8, 'bytes');
+      return array.decode(stream).should.deep.equal([258, 772]);
+  });
+
+    it('should decode length from function', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint8, function() { return 4; });
+      return array.decode(stream).should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should decode amount of bytes from function', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint16, (function() { return 4; }), 'bytes');
+      return array.decode(stream).should.deep.equal([258, 772]);
+  });
+
+    it('should decode to the end of the parent if no length is given', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new ArrayT(uint8);
+      return array.decode(stream, {_length: 4, _startOffset: 0}).should.deep.equal([1, 2, 3, 4]);
+  });
+
+    return it('should decode to the end of the stream if no parent and length is given', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4]));
+      const array = new ArrayT(uint8);
+      return array.decode(stream).should.deep.equal([1, 2, 3, 4]);
+  });
+});
+
+  describe('size', function() {
+    it('should use array length', function() {
+      const array = new ArrayT(uint8, 10);
+      return array.size([1, 2, 3, 4]).should.equal(4);
+    });
+
+    it('should add size of length field before string', function() {
+      const array = new ArrayT(uint8, uint8);
+      return array.size([1, 2, 3, 4]).should.equal(5);
+    });
+
+    return it('should use defined length if no value given', function() {
+      const array = new ArrayT(uint8, 10);
+      return array.size().should.equal(10);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should encode using array length', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1, 2, 3, 4]));
+        return done();
+      })
+      );
+
+      const array = new ArrayT(uint8, 10);
+      array.encode(stream, [1, 2, 3, 4]);
+      return stream.end();
+    });
+
+    it('should encode length as number before array', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([4, 1, 2, 3, 4]));
+        return done();
+      })
+      );
+
+      const array = new ArrayT(uint8, uint8);
+      array.encode(stream, [1, 2, 3, 4]);
+      return stream.end();
+    });
+
+    return it('should add pointers after array if length is encoded at start', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([4, 5, 6, 7, 8, 1, 2, 3, 4]));
+        return done();
+      })
+      );
+
+      const array = new ArrayT(new Pointer(uint8, uint8), uint8);
+      array.encode(stream, [1, 2, 3, 4]);
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Bitfield.js

@@ -0,0 +1,35 @@
+const {Bitfield, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Bitfield', function() {
+  const bitfield = new Bitfield(uint8, ['Jack', 'Kack', 'Lack', 'Mack', 'Nack', 'Oack', 'Pack', 'Quack']);
+  const JACK  = 1 << 0;
+  const KACK  = 1 << 1;
+  const LACK  = 1 << 2;
+  const MACK  = 1 << 3;
+  const NACK  = 1 << 4;
+  const OACK  = 1 << 5;
+  const PACK  = 1 << 6;
+  const QUACK = 1 << 7;
+
+  it('should have the right size', () => bitfield.size().should.equal(1));
+
+  it('should decode', function() {
+    const stream = new DecodeStream(Buffer.from([JACK | MACK | PACK | NACK | QUACK]));
+    return bitfield.decode(stream).should.deep.equal({
+      Jack: true, Kack: false, Lack: false, Mack: true, Nack: true, Oack: false, Pack: true, Quack: true});
+  });
+
+  return it('should encode', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([JACK | MACK | PACK | NACK | QUACK]));
+      return done();
+    })
+    );
+
+    bitfield.encode(stream, {Jack: true, Kack: false, Lack: false, Mack: true, Nack: true, Oack: false, Pack: true, Quack: true});
+    return stream.end();
+  });
+});

backend/node_modules/restructure/test/Boolean.js

@@ -0,0 +1,55 @@
+const {Boolean, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Boolean', function() {
+  describe('decode', function() {
+    it('should decode 0 as false', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const boolean = new Boolean(uint8);
+      return boolean.decode(stream).should.equal(false);
+    });
+
+    return it('should decode 1 as true', function() {
+      const stream = new DecodeStream(Buffer.from([1]));
+      const boolean = new Boolean(uint8);
+      return boolean.decode(stream).should.equal(true);
+    });
+  });
+
+  describe('size', () =>
+    it('should return given type size', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const boolean = new Boolean(uint8);
+      return boolean.size().should.equal(1);
+    })
+  );
+
+  return describe('encode', function() {
+    it('should encode false as 0', function(done) {
+      const stream = new EncodeStream;
+      const boolean = new Boolean(uint8);
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0]));
+        return done();
+      })
+      );
+
+      boolean.encode(stream, false);
+      return stream.end();
+    });
+
+    return it('should encode true as 1', function(done) {
+      const stream = new EncodeStream;
+      const boolean = new Boolean(uint8);
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1]));
+        return done();
+      })
+      );
+
+      boolean.encode(stream, true);
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Buffer.js

@@ -0,0 +1,62 @@
+const {Buffer:BufferT, DecodeStream, EncodeStream, uint8} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Buffer', function() {
+  describe('decode', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xab, 0xff, 0x1f, 0xb6]));
+      const buf = new BufferT(2);
+      buf.decode(stream).should.deep.equal(Buffer.from([0xab, 0xff]));
+      return buf.decode(stream).should.deep.equal(Buffer.from([0x1f, 0xb6]));
+  });
+
+    return it('should decode with parent key length', function() {
+      const stream = new DecodeStream(Buffer.from([0xab, 0xff, 0x1f, 0xb6]));
+      const buf = new BufferT('len');
+      buf.decode(stream, {len: 3}).should.deep.equal(Buffer.from([0xab, 0xff, 0x1f]));
+      return buf.decode(stream, {len: 1}).should.deep.equal(Buffer.from([0xb6]));
+  });
+});
+
+  describe('size', function() {
+    it('should return size', function() {
+      const buf = new BufferT(2);
+      return buf.size(Buffer.from([0xab, 0xff])).should.equal(2);
+    });
+
+    return it('should use defined length if no value given', function() {
+      const array = new BufferT(10);
+      return array.size().should.equal(10);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xab, 0xff, 0x1f, 0xb6]));
+        return done();
+      })
+      );
+
+      const buf = new BufferT(2);
+      buf.encode(stream, Buffer.from([0xab, 0xff]));
+      buf.encode(stream, Buffer.from([0x1f, 0xb6]));
+      return stream.end();
+    });
+
+    return it('should encode length before buffer', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([2, 0xab, 0xff]));
+        return done();
+      })
+      );
+
+      const buf = new BufferT(uint8);
+      buf.encode(stream, Buffer.from([0xab, 0xff]));
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/DecodeStream.js

@@ -0,0 +1,101 @@
+const {DecodeStream} = require('../');
+const should = require('chai').should();
+
+describe('DecodeStream', function() {
+  it('should read a buffer', function() {
+    const buf = Buffer.from([1,2,3]);
+    const stream = new DecodeStream(buf);
+    return stream.readBuffer(buf.length).should.deep.equal(Buffer.from([1,2,3]));
+});
+
+  it('should readUInt16BE', function() {
+    const buf = Buffer.from([0xab, 0xcd]);
+    const stream = new DecodeStream(buf);
+    return stream.readUInt16BE().should.deep.equal(0xabcd);
+  });
+
+  it('should readUInt16LE', function() {
+    const buf = Buffer.from([0xab, 0xcd]);
+    const stream = new DecodeStream(buf);
+    return stream.readUInt16LE().should.deep.equal(0xcdab);
+  });
+
+  it('should readUInt24BE', function() {
+    const buf = Buffer.from([0xab, 0xcd, 0xef]);
+    const stream = new DecodeStream(buf);
+    return stream.readUInt24BE().should.deep.equal(0xabcdef);
+  });
+
+  it('should readUInt24LE', function() {
+    const buf = Buffer.from([0xab, 0xcd, 0xef]);
+    const stream = new DecodeStream(buf);
+    return stream.readUInt24LE().should.deep.equal(0xefcdab);
+  });
+
+  it('should readInt24BE', function() {
+    const buf = Buffer.from([0xff, 0xab, 0x24]);
+    const stream = new DecodeStream(buf);
+    return stream.readInt24BE().should.deep.equal(-21724);
+  });
+
+  it('should readInt24LE', function() {
+    const buf = Buffer.from([0x24, 0xab, 0xff]);
+    const stream = new DecodeStream(buf);
+    return stream.readInt24LE().should.deep.equal(-21724);
+  });
+
+  return describe('readString', function() {
+    it('should decode ascii by default', function() {
+      const buf = Buffer.from('some text', 'ascii');
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length).should.equal('some text');
+    });
+
+    it('should decode ascii', function() {
+      const buf = Buffer.from('some text', 'ascii');
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'ascii').should.equal('some text');
+    });
+
+    it('should decode utf8', function() {
+      const buf = Buffer.from('unicode! 👍', 'utf8');
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'utf8').should.equal('unicode! 👍');
+    });
+
+    it('should decode utf16le', function() {
+      const buf = Buffer.from('unicode! 👍', 'utf16le');
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'utf16le').should.equal('unicode! 👍');
+    });
+
+    it('should decode ucs2', function() {
+      const buf = Buffer.from('unicode! 👍', 'ucs2');
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'ucs2').should.equal('unicode! 👍');
+    });
+
+    it('should decode utf16be', function() {
+      const buf = Buffer.from('unicode! 👍', 'utf16le');
+      for (let i = 0, end = buf.length - 1; i < end; i += 2) {
+        const byte = buf[i];
+        buf[i] = buf[i + 1];
+        buf[i + 1] = byte;
+      }
+
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'utf16be').should.equal('unicode! 👍');
+    });
+
+    it('should decode macroman', function() {
+      const buf = Buffer.from([0x8a, 0x63, 0x63, 0x65, 0x6e, 0x74, 0x65, 0x64, 0x20, 0x63, 0x68, 0x87, 0x72, 0x61, 0x63, 0x74, 0x65, 0x72, 0x73]);
+      const stream = new DecodeStream(buf);
+      return stream.readString(buf.length, 'mac').should.equal('äccented cháracters');
+    });
+
+    return it('should return a buffer for unsupported encodings', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3]));
+      return stream.readString(3, 'unsupported').should.deep.equal(Buffer.from([1, 2, 3]));
+  });
+});
+});

backend/node_modules/restructure/test/EncodeStream.js

@@ -0,0 +1,197 @@
+const {EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('EncodeStream', function() {
+  it('should write a buffer', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([1,2,3]));
+      return done();
+    })
+    );
+
+    stream.writeBuffer(Buffer.from([1,2,3]));
+    return stream.end();
+  });
+
+  it('should writeUInt16BE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0xab, 0xcd]));
+      return done();
+    })
+    );
+
+    stream.writeUInt16BE(0xabcd);
+    return stream.end();
+  });
+
+  it('should writeUInt16LE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0xab, 0xcd]));
+      return done();
+    })
+    );
+
+    stream.writeUInt16LE(0xcdab);
+    return stream.end();
+  });
+
+  it('should writeUInt24BE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0xab, 0xcd, 0xef]));
+      return done();
+    })
+    );
+
+    stream.writeUInt24BE(0xabcdef);
+    return stream.end();
+  });
+
+  it('should writeUInt24LE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0xef, 0xcd, 0xab]));
+      return done();
+    })
+    );
+
+    stream.writeUInt24LE(0xabcdef);
+    return stream.end();
+  });
+
+  it('should writeInt24BE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0xff, 0xab, 0x24, 0xab, 0xcd, 0xef]));
+      return done();
+    })
+    );
+
+    stream.writeInt24BE(-21724);
+    stream.writeInt24BE(0xabcdef);
+    return stream.end();
+  });
+
+  it('should writeInt24LE', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0x24, 0xab, 0xff, 0xef, 0xcd, 0xab]));
+      return done();
+    })
+    );
+
+    stream.writeInt24LE(-21724);
+    stream.writeInt24LE(0xabcdef);
+    return stream.end();
+  });
+
+  it('should fill', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([10, 10, 10, 10, 10]));
+      return done();
+    })
+    );
+
+    stream.fill(10, 5);
+    return stream.end();
+  });
+
+  return describe('writeString', function() {
+    it('should encode ascii by default', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('some text', 'ascii'));
+        return done();
+      })
+      );
+
+      stream.writeString('some text');
+      return stream.end();
+    });
+
+    it('should encode ascii', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('some text', 'ascii'));
+        return done();
+      })
+      );
+
+      stream.writeString('some text');
+      return stream.end();
+    });
+
+    it('should encode utf8', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('unicode! 👍', 'utf8'));
+        return done();
+      })
+      );
+
+      stream.writeString('unicode! 👍', 'utf8');
+      return stream.end();
+    });
+
+    it('should encode utf16le', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('unicode! 👍', 'utf16le'));
+        return done();
+      })
+      );
+
+      stream.writeString('unicode! 👍', 'utf16le');
+      return stream.end();
+    });
+
+    it('should encode ucs2', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('unicode! 👍', 'ucs2'));
+        return done();
+      })
+      );
+
+      stream.writeString('unicode! 👍', 'ucs2');
+      return stream.end();
+    });
+
+    it('should encode utf16be', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(out) {
+        const buf = Buffer.from('unicode! 👍', 'utf16le');
+        for (let i = 0, end = buf.length - 1; i < end; i += 2) {
+          const byte = buf[i];
+          buf[i] = buf[i + 1];
+          buf[i + 1] = byte;
+        }
+
+        out.should.deep.equal(buf);
+        return done();
+      })
+      );
+
+      stream.writeString('unicode! 👍', 'utf16be');
+      return stream.end();
+    });
+
+    return it('should encode macroman', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(out) {
+        const buf = Buffer.from([0x8a, 0x63, 0x63, 0x65, 0x6e, 0x74, 0x65, 0x64, 0x20, 0x63, 0x68, 0x87, 0x72, 0x61, 0x63, 0x74, 0x65, 0x72, 0x73]);
+        out.should.deep.equal(buf);
+        return done();
+      })
+      );
+
+      stream.writeString('äccented cháracters', 'mac');
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Enum.js

@@ -0,0 +1,34 @@
+const {Enum, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Enum', function() {
+  const e = new Enum(uint8, ['foo', 'bar', 'baz']);
+  it('should have the right size', () => e.size().should.equal(1));
+
+  it('should decode', function() {
+    const stream = new DecodeStream(Buffer.from([1, 2, 0]));
+    e.decode(stream).should.equal('bar');
+    e.decode(stream).should.equal('baz');
+    return e.decode(stream).should.equal('foo');
+  });
+
+  it('should encode', function(done) {
+    const stream = new EncodeStream;
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([1, 2, 0]));
+      return done();
+    })
+    );
+
+    e.encode(stream, 'bar');
+    e.encode(stream, 'baz');
+    e.encode(stream, 'foo');
+    return stream.end();
+  });
+
+  return it('should throw on unknown option', function() {
+    const stream = new EncodeStream;
+    return should.throw(() => e.encode(stream, 'unknown'));
+  });
+});

backend/node_modules/restructure/test/LazyArray.js

@@ -0,0 +1,77 @@
+const {LazyArray, Pointer, uint8, uint16, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('LazyArray', function() {
+  describe('decode', function() {
+    it('should decode items lazily', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      arr.should.not.be.an.instanceof(Array);
+      arr.should.have.length(4);
+      stream.pos.should.equal(4);
+
+      arr.get(0).should.equal(1);
+      arr.get(1).should.equal(2);
+      arr.get(2).should.equal(3);
+      arr.get(3).should.equal(4);
+
+      should.not.exist(arr.get(-1));
+      return should.not.exist(arr.get(5));
+    });
+
+    it('should be able to convert to an array', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      return arr.toArray().should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should have an inspect method', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      return arr.inspect().should.equal('[ 1, 2, 3, 4 ]');
+    });
+
+    return it('should decode length as number before array', function() {
+      const stream = new DecodeStream(Buffer.from([4, 1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, uint8);
+      const arr = array.decode(stream);
+
+      return arr.toArray().should.deep.equal([1, 2, 3, 4]);
+  });
+});
+
+  describe('size', () =>
+    it('should work with LazyArrays', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+      const arr = array.decode(stream);
+
+      return array.size(arr).should.equal(4);
+    })
+  );
+
+  return describe('encode', () =>
+    it('should work with LazyArrays', function(done) {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+      const arr = array.decode(stream);
+
+      const enc = new EncodeStream;
+      enc.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1, 2, 3, 4]));
+        return done();
+      })
+      );
+
+      array.encode(enc, arr);
+      return enc.end();
+    })
+  );
+});

backend/node_modules/restructure/test/Number.js

@@ -0,0 +1,525 @@
+const {
+  uint8,
+  uint16, uint16be, uint16le,
+  uint24, uint24be, uint24le,
+  uint32, uint32be, uint32le,
+  int8,
+  int16, int16be, int16le,
+  int24, int24be, int24le,
+  int32, int32be, int32le,
+  float, floatbe, floatle,
+  double, doublebe, doublele,
+  fixed16, fixed16be, fixed16le,
+  fixed32, fixed32be, fixed32le,
+  DecodeStream, EncodeStream
+} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Number', function() {
+  describe('uint8', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xab, 0xff]));
+      uint8.decode(stream).should.equal(0xab);
+      return uint8.decode(stream).should.equal(0xff);
+    });
+
+    it('should have a size', () => uint8.size().should.equal(1));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xab, 0xff]));
+        return done();
+      })
+      );
+
+      uint8.encode(stream, 0xab);
+      uint8.encode(stream, 0xff);
+      return stream.end();
+    });
+  });
+
+  describe('uint16', () =>
+    it('is an alias for uint16be', () => uint16.should.equal(uint16be))
+  );
+
+  describe('uint16be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xab, 0xff]));
+      return uint16be.decode(stream).should.equal(0xabff);
+    });
+
+    it('should have a size', () => uint16be.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xab, 0xff]));
+        return done();
+      })
+      );
+
+      uint16be.encode(stream, 0xabff);
+      return stream.end();
+    });
+  });
+
+  describe('uint16le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab]));
+      return uint16le.decode(stream).should.equal(0xabff);
+    });
+
+    it('should have a size', () => uint16le.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab]));
+        return done();
+      })
+      );
+
+      uint16le.encode(stream, 0xabff);
+      return stream.end();
+    });
+  });
+
+  describe('uint24', () =>
+    it('is an alias for uint24be', () => uint24.should.equal(uint24be))
+  );
+
+  describe('uint24be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab, 0x24]));
+      return uint24be.decode(stream).should.equal(0xffab24);
+    });
+
+    it('should have a size', () => uint24be.size().should.equal(3));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab, 0x24]));
+        return done();
+      })
+      );
+
+      uint24be.encode(stream, 0xffab24);
+      return stream.end();
+    });
+  });
+
+  describe('uint24le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x24, 0xab, 0xff]));
+      return uint24le.decode(stream).should.equal(0xffab24);
+    });
+
+    it('should have a size', () => uint24le.size().should.equal(3));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x24, 0xab, 0xff]));
+        return done();
+      })
+      );
+
+      uint24le.encode(stream, 0xffab24);
+      return stream.end();
+    });
+  });
+
+  describe('uint32', () =>
+    it('is an alias for uint32be', () => uint32.should.equal(uint32be))
+  );
+
+  describe('uint32be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab, 0x24, 0xbf]));
+      return uint32be.decode(stream).should.equal(0xffab24bf);
+    });
+
+    it('should have a size', () => uint32be.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab, 0x24, 0xbf]));
+        return done();
+      })
+      );
+
+      uint32be.encode(stream, 0xffab24bf);
+      return stream.end();
+    });
+  });
+
+  describe('uint32le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xbf, 0x24, 0xab, 0xff]));
+      return uint32le.decode(stream).should.equal(0xffab24bf);
+    });
+
+    it('should have a size', () => uint32le.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xbf, 0x24, 0xab, 0xff]));
+        return done();
+      })
+      );
+
+      uint32le.encode(stream, 0xffab24bf);
+      return stream.end();
+    });
+  });
+
+  describe('int8', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x7f, 0xff]));
+      int8.decode(stream).should.equal(127);
+      return int8.decode(stream).should.equal(-1);
+    });
+
+    it('should have a size', () => int8.size().should.equal(1));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x7f, 0xff]));
+        return done();
+      })
+      );
+
+      int8.encode(stream, 127);
+      int8.encode(stream, -1);
+      return stream.end();
+    });
+  });
+
+  describe('int16', () =>
+    it('is an alias for int16be', () => int16.should.equal(int16be))
+  );
+
+  describe('int16be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab]));
+      return int16be.decode(stream).should.equal(-85);
+    });
+
+    it('should have a size', () => int16be.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab]));
+        return done();
+      })
+      );
+
+      int16be.encode(stream, -85);
+      return stream.end();
+    });
+  });
+
+  describe('int16le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xab, 0xff]));
+      return int16le.decode(stream).should.equal(-85);
+    });
+
+    it('should have a size', () => int16le.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xab, 0xff]));
+        return done();
+      })
+      );
+
+      int16le.encode(stream, -85);
+      return stream.end();
+    });
+  });
+
+  describe('int24', () =>
+    it('is an alias for int24be', () => int24.should.equal(int24be))
+  );
+
+  describe('int24be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab, 0x24]));
+      return int24be.decode(stream).should.equal(-21724);
+    });
+
+    it('should have a size', () => int24be.size().should.equal(3));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab, 0x24]));
+        return done();
+      })
+      );
+
+      int24be.encode(stream, -21724);
+      return stream.end();
+    });
+  });
+
+  describe('int24le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x24, 0xab, 0xff]));
+      return int24le.decode(stream).should.equal(-21724);
+    });
+
+    it('should have a size', () => int24le.size().should.equal(3));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x24, 0xab, 0xff]));
+        return done();
+      })
+      );
+
+      int24le.encode(stream, -21724);
+      return stream.end();
+    });
+  });
+
+  describe('int32', () =>
+    it('is an alias for int32be', () => int32.should.equal(int32be))
+  );
+
+  describe('int32be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xff, 0xab, 0x24, 0xbf]));
+      return int32be.decode(stream).should.equal(-5561153);
+    });
+
+    it('should have a size', () => int32be.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xff, 0xab, 0x24, 0xbf]));
+        return done();
+      })
+      );
+
+      int32be.encode(stream, -5561153);
+      return stream.end();
+    });
+  });
+
+  describe('int32le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xbf, 0x24, 0xab, 0xff]));
+      return int32le.decode(stream).should.equal(-5561153);
+    });
+
+    it('should have a size', () => int32le.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xbf, 0x24, 0xab, 0xff]));
+        return done();
+      })
+      );
+
+      int32le.encode(stream, -5561153);
+      return stream.end();
+    });
+  });
+
+  describe('float', () =>
+    it('is an alias for floatbe', () => float.should.equal(floatbe))
+  );
+
+  describe('floatbe', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x43, 0x7a, 0x8c, 0xcd]));
+      return floatbe.decode(stream).should.be.closeTo(250.55, 0.005);
+    });
+
+    it('should have a size', () => floatbe.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x43, 0x7a, 0x8c, 0xcd]));
+        return done();
+      })
+      );
+
+      floatbe.encode(stream, 250.55);
+      return stream.end();
+    });
+  });
+
+  describe('floatle', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xcd, 0x8c, 0x7a, 0x43]));
+      return floatle.decode(stream).should.be.closeTo(250.55, 0.005);
+    });
+
+    it('should have a size', () => floatle.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xcd, 0x8c, 0x7a, 0x43]));
+        return done();
+      })
+      );
+
+      floatle.encode(stream, 250.55);
+      return stream.end();
+    });
+  });
+
+  describe('double', () =>
+    it('is an alias for doublebe', () => double.should.equal(doublebe))
+  );
+
+  describe('doublebe', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x40, 0x93, 0x4a, 0x3d, 0x70, 0xa3, 0xd7, 0x0a]));
+      return doublebe.decode(stream).should.be.equal(1234.56);
+    });
+
+    it('should have a size', () => doublebe.size().should.equal(8));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x40, 0x93, 0x4a, 0x3d, 0x70, 0xa3, 0xd7, 0x0a]));
+        return done();
+      })
+      );
+
+      doublebe.encode(stream, 1234.56);
+      return stream.end();
+    });
+  });
+
+  describe('doublele', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x0a, 0xd7, 0xa3, 0x70, 0x3d, 0x4a, 0x93, 0x40]));
+      return doublele.decode(stream).should.be.equal(1234.56);
+    });
+
+    it('should have a size', () => doublele.size().should.equal(8));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x0a, 0xd7, 0xa3, 0x70, 0x3d, 0x4a, 0x93, 0x40]));
+        return done();
+      })
+      );
+
+      doublele.encode(stream, 1234.56);
+      return stream.end();
+    });
+  });
+
+  describe('fixed16', () =>
+    it('is an alias for fixed16be', () => fixed16.should.equal(fixed16be))
+  );
+
+  describe('fixed16be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x19, 0x57]));
+      return fixed16be.decode(stream).should.be.closeTo(25.34, 0.005);
+    });
+
+    it('should have a size', () => fixed16be.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x19, 0x57]));
+        return done();
+      })
+      );
+
+      fixed16be.encode(stream, 25.34);
+      return stream.end();
+    });
+  });
+
+  describe('fixed16le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x57, 0x19]));
+      return fixed16le.decode(stream).should.be.closeTo(25.34, 0.005);
+    });
+
+    it('should have a size', () => fixed16le.size().should.equal(2));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x57, 0x19]));
+        return done();
+      })
+      );
+
+      fixed16le.encode(stream, 25.34);
+      return stream.end();
+    });
+  });
+
+  describe('fixed32', () =>
+    it('is an alias for fixed32be', () => fixed32.should.equal(fixed32be))
+  );
+
+  describe('fixed32be', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0x00, 0xfa, 0x8c, 0xcc]));
+      return fixed32be.decode(stream).should.be.closeTo(250.55, 0.005);
+    });
+
+    it('should have a size', () => fixed32be.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0x00, 0xfa, 0x8c, 0xcc]));
+        return done();
+      })
+      );
+
+      fixed32be.encode(stream, 250.55);
+      return stream.end();
+    });
+  });
+
+  return describe('fixed32le', function() {
+    it('should decode', function() {
+      const stream = new DecodeStream(Buffer.from([0xcc, 0x8c, 0xfa, 0x00]));
+      return fixed32le.decode(stream).should.be.closeTo(250.55, 0.005);
+    });
+
+    it('should have a size', () => fixed32le.size().should.equal(4));
+
+    return it('should encode', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0xcc, 0x8c, 0xfa, 0x00]));
+        return done();
+      })
+      );
+
+      fixed32le.encode(stream, 250.55);
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Optional.js

@@ -0,0 +1,141 @@
+const {Optional, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Optional', function() {
+  describe('decode', function() {
+    it('should not decode when condition is falsy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, false);
+      should.not.exist(optional.decode(stream));
+      return stream.pos.should.equal(0);
+    });
+
+    it('should not decode when condition is a function and falsy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, function() { return false; });
+      should.not.exist(optional.decode(stream));
+      return stream.pos.should.equal(0);
+    });
+
+    it('should decode when condition is omitted', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8);
+      should.exist(optional.decode(stream));
+      return stream.pos.should.equal(1);
+    });
+
+    it('should decode when condition is truthy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, true);
+      should.exist(optional.decode(stream));
+      return stream.pos.should.equal(1);
+    });
+
+    return it('should decode when condition is a function and truthy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, function() { return true; });
+      should.exist(optional.decode(stream));
+      return stream.pos.should.equal(1);
+    });
+  });
+
+  describe('size', function() {
+    it('should return 0 when condition is falsy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, false);
+      return optional.size().should.equal(0);
+    });
+
+    it('should return 0 when condition is a function and falsy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, function() { return false; });
+      return optional.size().should.equal(0);
+    });
+
+    it('should return given type size when condition is omitted', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8);
+      return optional.size().should.equal(1);
+    });
+
+    it('should return given type size when condition is truthy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, true);
+      return optional.size().should.equal(1);
+    });
+
+    return it('should return given type size when condition is a function and truthy', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const optional = new Optional(uint8, function() { return true; });
+      return optional.size().should.equal(1);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should not encode when condition is falsy', function(done) {
+      const stream = new EncodeStream;
+      const optional = new Optional(uint8, false);
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal([]);
+        return done();
+      })
+      );
+
+      optional.encode(stream, 128);
+      return stream.end();
+    });
+
+    it('should not encode when condition is a function and falsy', function(done) {
+      const stream = new EncodeStream;
+      const optional = new Optional(uint8, function() { return false; });
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal([]);
+        return done();
+      })
+      );
+
+      optional.encode(stream, 128);
+      return stream.end();
+    });
+
+    it('should encode when condition is omitted', function(done) {
+      const stream = new EncodeStream;
+      const optional = new Optional(uint8);
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([128]));
+        return done();
+      })
+      );
+
+      optional.encode(stream, 128);
+      return stream.end();
+    });
+
+    it('should encode when condition is truthy', function(done) {
+      const stream = new EncodeStream;
+      const optional = new Optional(uint8, true);
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([128]));
+        return done();
+      })
+      );
+
+      optional.encode(stream, 128);
+      return stream.end();
+    });
+
+    return it('should encode when condition is a function and truthy', function(done) {
+      const stream = new EncodeStream;
+      const optional = new Optional(uint8, function() { return true; });
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([128]));
+        return done();
+      })
+      );
+
+      optional.encode(stream, 128);
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Pointer.js

@@ -0,0 +1,337 @@
+const {Pointer, VoidPointer, uint8, DecodeStream, EncodeStream, Struct} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Pointer', function() {
+  describe('decode', function() {
+    it('should handle null pointers', function() {
+      const stream = new DecodeStream(Buffer.from([0]));
+      const pointer = new Pointer(uint8, uint8);
+      return should.not.exist(pointer.decode(stream, {_startOffset: 50}));
+    });
+
+    it('should use local offsets from start of parent by default', function() {
+      const stream = new DecodeStream(Buffer.from([1, 53]));
+      const pointer = new Pointer(uint8, uint8);
+      return pointer.decode(stream, {_startOffset: 0}).should.equal(53);
+    });
+
+    it('should support immediate offsets', function() {
+      const stream = new DecodeStream(Buffer.from([1, 53]));
+      const pointer = new Pointer(uint8, uint8, {type: 'immediate'});
+      return pointer.decode(stream).should.equal(53);
+    });
+
+    it('should support offsets relative to the parent', function() {
+      const stream = new DecodeStream(Buffer.from([0, 0, 1, 53]));
+      stream.pos = 2;
+      const pointer = new Pointer(uint8, uint8, {type: 'parent'});
+      return pointer.decode(stream, {parent: {_startOffset: 2}}).should.equal(53);
+    });
+
+    it('should support global offsets', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 4, 0, 0, 0, 53]));
+      const pointer = new Pointer(uint8, uint8, {type: 'global'});
+      stream.pos = 2;
+      return pointer.decode(stream, {parent: {parent: {_startOffset: 2}}}).should.equal(53);
+    });
+
+    it('should support offsets relative to a property on the parent', function() {
+      const stream = new DecodeStream(Buffer.from([1, 0, 0, 0, 0, 53]));
+      const pointer = new Pointer(uint8, uint8, {relativeTo: ctx => ctx.parent.ptr});
+      return pointer.decode(stream, {_startOffset: 0, parent: {ptr: 4}}).should.equal(53);
+    });
+
+    it('should throw when passing a non function relativeTo option', function() {
+      return should.throw(() => new Pointer(uint8, uint8, {relativeTo: 'parent.ptr'}));
+    });
+
+    it('should support returning pointer if there is no decode type', function() {
+      const stream = new DecodeStream(Buffer.from([4]));
+      const pointer = new Pointer(uint8, 'void');
+      return pointer.decode(stream, {_startOffset: 0}).should.equal(4);
+    });
+
+    return it('should support decoding pointers lazily', function() {
+      const stream = new DecodeStream(Buffer.from([1, 53]));
+      const struct = new Struct({
+        ptr: new Pointer(uint8, uint8, {lazy: true})});
+
+      const res = struct.decode(stream);
+      Object.getOwnPropertyDescriptor(res, 'ptr').get.should.be.a('function');
+      Object.getOwnPropertyDescriptor(res, 'ptr').enumerable.should.equal(true);
+      return res.ptr.should.equal(53);
+    });
+  });
+
+  describe('size', function() {
+    it('should add to local pointerSize', function() {
+      const pointer = new Pointer(uint8, uint8);
+      const ctx = {pointerSize: 0};
+      pointer.size(10, ctx).should.equal(1);
+      return ctx.pointerSize.should.equal(1);
+    });
+
+    it('should add to immediate pointerSize', function() {
+      const pointer = new Pointer(uint8, uint8, {type: 'immediate'});
+      const ctx = {pointerSize: 0};
+      pointer.size(10, ctx).should.equal(1);
+      return ctx.pointerSize.should.equal(1);
+    });
+
+    it('should add to parent pointerSize', function() {
+      const pointer = new Pointer(uint8, uint8, {type: 'parent'});
+      const ctx = {parent: {pointerSize: 0}};
+      pointer.size(10, ctx).should.equal(1);
+      return ctx.parent.pointerSize.should.equal(1);
+    });
+
+    it('should add to global pointerSize', function() {
+      const pointer = new Pointer(uint8, uint8, {type: 'global'});
+      const ctx = {parent: {parent: {parent: {pointerSize: 0}}}};
+      pointer.size(10, ctx).should.equal(1);
+      return ctx.parent.parent.parent.pointerSize.should.equal(1);
+    });
+
+    it('should handle void pointers', function() {
+      const pointer = new Pointer(uint8, 'void');
+      const ctx = {pointerSize: 0};
+      pointer.size(new VoidPointer(uint8, 50), ctx).should.equal(1);
+      return ctx.pointerSize.should.equal(1);
+    });
+
+    it('should throw if no type and not a void pointer', function() {
+      const pointer = new Pointer(uint8, 'void');
+      const ctx = {pointerSize: 0};
+      return should.throw(() => pointer.size(30, ctx).should.equal(1));
+    });
+
+    return it('should return a fixed size without a value', function() {
+      const pointer = new Pointer(uint8, uint8);
+      return pointer.size().should.equal(1);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should handle null pointers', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8);
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 0,
+        pointers: []
+      };
+
+      ptr.encode(stream, null, ctx);
+      ctx.pointerSize.should.equal(0);
+
+      return stream.end();
+    });
+
+    it('should handle local offsets', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8);
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 1,
+        pointers: []
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.pointerOffset.should.equal(2);
+      ctx.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should handle immediate offsets', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8, {type: 'immediate'});
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 1,
+        pointers: []
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.pointerOffset.should.equal(2);
+      ctx.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should handle immediate offsets', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([0]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8, {type: 'immediate'});
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 1,
+        pointers: []
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.pointerOffset.should.equal(2);
+      ctx.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should handle offsets relative to parent', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([2]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8, {type: 'parent'});
+      const ctx = {
+        parent: {
+          pointerSize: 0,
+          startOffset: 3,
+          pointerOffset: 5,
+          pointers: []
+        }
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.parent.pointerOffset.should.equal(6);
+      ctx.parent.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should handle global offsets', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([5]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8, {type: 'global'});
+      const ctx = {
+        parent: {
+          parent: {
+            parent: {
+              pointerSize: 0,
+              startOffset: 3,
+              pointerOffset: 5,
+              pointers: []
+            }
+          }
+        }
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.parent.parent.parent.pointerOffset.should.equal(6);
+      ctx.parent.parent.parent.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should support offsets relative to a property on the parent', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([6]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, uint8, {relativeTo: ctx => ctx.ptr});
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 10,
+        pointers: [],
+        val: {
+          ptr: 4
+        }
+      };
+
+      ptr.encode(stream, 10, ctx);
+      ctx.pointerOffset.should.equal(11);
+      ctx.pointers.should.deep.equal([
+        { type: uint8, val: 10, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    it('should support void pointers', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1]));
+        return done();
+      })
+      );
+
+      const ptr = new Pointer(uint8, 'void');
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 1,
+        pointers: []
+      };
+
+      ptr.encode(stream, new VoidPointer(uint8, 55), ctx);
+      ctx.pointerOffset.should.equal(2);
+      ctx.pointers.should.deep.equal([
+        { type: uint8, val: 55, parent: ctx }
+      ]);
+
+      return stream.end();
+    });
+
+    return it('should throw if not a void pointer instance', function() {
+      const stream = new EncodeStream;
+      const ptr = new Pointer(uint8, 'void');
+      const ctx = {
+        pointerSize: 0,
+        startOffset: 0,
+        pointerOffset: 1,
+        pointers: []
+      };
+
+      return should.throw(() => ptr.encode(stream, 44, ctx));
+    });
+  });
+});

backend/node_modules/restructure/test/Reserved.js

@@ -0,0 +1,35 @@
+const {Reserved, uint8, uint16, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Reserved', function() {
+  it('should have a default count of 1', function() {
+    const reserved = new Reserved(uint8);
+    return reserved.size().should.equal(1);
+  });
+
+  it('should allow custom counts and types', function() {
+    const reserved = new Reserved(uint16, 10);
+    return reserved.size().should.equal(20);
+  });
+
+  it('should decode', function() {
+    const stream = new DecodeStream(Buffer.from([0, 0]));
+    const reserved = new Reserved(uint16);
+    should.not.exist(reserved.decode(stream));
+    return stream.pos.should.equal(2);
+  });
+
+  return it('should encode', function(done) {
+    const stream = new EncodeStream;
+    const reserved = new Reserved(uint16);
+    stream.pipe(concat(function(buf) {
+      buf.should.deep.equal(Buffer.from([0, 0]));
+      return done();
+    })
+    );
+
+    reserved.encode(stream);
+    return stream.end();
+  });
+});

backend/node_modules/restructure/test/String.js

@@ -0,0 +1,167 @@
+const {String:StringT, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('String', function() {
+  describe('decode', function() {
+    it('should decode fixed length', function() {
+      const stream = new DecodeStream(Buffer.from('testing'));
+      const string = new StringT(7);
+      return string.decode(stream).should.equal('testing');
+    });
+
+    it('should decode length from parent key', function() {
+      const stream = new DecodeStream(Buffer.from('testing'));
+      const string = new StringT('len');
+      return string.decode(stream, {len: 7}).should.equal('testing');
+    });
+
+    it('should decode length as number before string', function() {
+      const stream = new DecodeStream(Buffer.from('\x07testing'));
+      const string = new StringT(uint8);
+      return string.decode(stream).should.equal('testing');
+    });
+
+    it('should decode utf8', function() {
+      const stream = new DecodeStream(Buffer.from('🍻'));
+      const string = new StringT(4, 'utf8');
+      return string.decode(stream).should.equal('🍻');
+    });
+
+    it('should decode encoding computed from function', function() {
+      const stream = new DecodeStream(Buffer.from('🍻'));
+      const string = new StringT(4, function() { return 'utf8'; });
+      return string.decode(stream).should.equal('🍻');
+    });
+
+    it('should decode null-terminated string and read past terminator', function() {
+      const stream = new DecodeStream(Buffer.from('🍻\x00'));
+      const string = new StringT(null, 'utf8');
+      string.decode(stream).should.equal('🍻');
+      return stream.pos.should.equal(5);
+    });
+
+    return it('should decode remainder of buffer when null-byte missing', function() {
+      const stream = new DecodeStream(Buffer.from('🍻'));
+      const string = new StringT(null, 'utf8');
+      return string.decode(stream).should.equal('🍻');
+    });
+  });
+
+  describe('size', function() {
+    it('should use string length', function() {
+      const string = new StringT(7);
+      return string.size('testing').should.equal(7);
+    });
+
+    it('should use correct encoding', function() {
+      const string = new StringT(10, 'utf8');
+      return string.size('🍻').should.equal(4);
+    });
+
+    it('should use encoding from function', function() {
+      const string = new StringT(10, function() { return 'utf8'; });
+      return string.size('🍻').should.equal(4);
+    });
+
+    it('should add size of length field before string', function() {
+      const string = new StringT(uint8, 'utf8');
+      return string.size('🍻').should.equal(5);
+    });
+
+    it('should work with utf16be encoding', function() {
+      const string = new StringT(10, 'utf16be');
+      return string.size('🍻').should.equal(4);
+    });
+
+    it('should take null-byte into account', function() {
+      const string = new StringT(null, 'utf8');
+      return string.size('🍻').should.equal(5);
+    });
+
+    return it('should use defined length if no value given', function() {
+      const array = new StringT(10);
+      return array.size().should.equal(10);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should encode using string length', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('testing'));
+        return done();
+      })
+      );
+
+      const string = new StringT(7);
+      string.encode(stream, 'testing');
+      return stream.end();
+    });
+
+    it('should encode length as number before string', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x07testing'));
+        return done();
+      })
+      );
+
+      const string = new StringT(uint8);
+      string.encode(stream, 'testing');
+      return stream.end();
+    });
+
+    it('should encode length as number before string utf8', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x0ctesting 😜', 'utf8'));
+        return done();
+      })
+      );
+
+      const string = new StringT(uint8, 'utf8');
+      string.encode(stream, 'testing 😜');
+      return stream.end();
+    });
+
+    it('should encode utf8', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('🍻'));
+        return done();
+      })
+      );
+
+      const string = new StringT(4, 'utf8');
+      string.encode(stream, '🍻');
+      return stream.end();
+    });
+
+    it('should encode encoding computed from function', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('🍻'));
+        return done();
+      })
+      );
+
+      const string = new StringT(4, function() { return 'utf8'; });
+      string.encode(stream, '🍻');
+      return stream.end();
+    });
+
+    return it('should encode null-terminated string', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('🍻\x00'));
+        return done();
+      })
+      );
+
+      const string = new StringT(null, 'utf8');
+      string.encode(stream, '🍻');
+      return stream.end();
+    });
+  });
+});

backend/node_modules/restructure/test/Struct.js

@@ -0,0 +1,175 @@
+const {Struct, String:StringT, Pointer, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('Struct', function() {
+  describe('decode', function() {
+    it('should decode into an object', function() {
+      const stream = new DecodeStream(Buffer.from('\x05devon\x15'));
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8
+      });
+
+      return struct.decode(stream).should.deep.equal({
+        name: 'devon',
+        age: 21
+      });
+    });
+
+    it('should support process hook', function() {
+      const stream = new DecodeStream(Buffer.from('\x05devon\x20'));
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8
+      });
+
+      struct.process = function() {
+        return this.canDrink = this.age >= 21;
+      };
+
+      return struct.decode(stream).should.deep.equal({
+        name: 'devon',
+        age: 32,
+        canDrink: true
+      });
+    });
+
+    return it('should support function keys', function() {
+      const stream = new DecodeStream(Buffer.from('\x05devon\x20'));
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8,
+        canDrink() { return this.age >= 21; }
+      });
+
+      return struct.decode(stream).should.deep.equal({
+        name: 'devon',
+        age: 32,
+        canDrink: true
+      });
+    });
+  });
+
+  describe('size', function() {
+    it('should compute the correct size', function() {
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8
+      });
+
+      return struct.size({name: 'devon', age: 21}).should.equal(7);
+    });
+
+    it('should compute the correct size with pointers', function() {
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8,
+        ptr: new Pointer(uint8, new StringT(uint8))
+      });
+
+      const size = struct.size({
+        name: 'devon',
+        age: 21,
+        ptr: 'hello'
+      });
+
+      return size.should.equal(14);
+    });
+
+    it('should get the correct size when no value is given', function() {
+      const struct = new Struct({
+        name: new StringT(4),
+        age: uint8
+      });
+
+      return struct.size().should.equal(5);
+    });
+
+    return it('should throw when getting non-fixed length size and no value is given', function() {
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8
+      });
+
+      return should.throw(() => struct.size()
+      , /not a fixed size/i);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should encode objects to buffers', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x05devon\x15'));
+        return done();
+      })
+      );
+
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8
+      });
+
+      struct.encode(stream, {
+        name: 'devon',
+        age: 21
+      }
+      );
+
+      return stream.end();
+    });
+
+    it('should support preEncode hook', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x05devon\x15'));
+        return done();
+      })
+      );
+
+      const struct = new Struct({
+        nameLength: uint8,
+        name: new StringT('nameLength'),
+        age: uint8
+      });
+
+      struct.preEncode = function() {
+        return this.nameLength = this.name.length;
+      };
+
+      struct.encode(stream, {
+        name: 'devon',
+        age: 21
+      }
+      );
+
+      return stream.end();
+    });
+
+    return it('should encode pointer data after structure', function(done) {
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x05devon\x15\x08\x05hello'));
+        return done();
+      })
+      );
+
+      const struct = new Struct({
+        name: new StringT(uint8),
+        age: uint8,
+        ptr: new Pointer(uint8, new StringT(uint8))
+      });
+
+      struct.encode(stream, {
+        name: 'devon',
+        age: 21,
+        ptr: 'hello'
+      }
+      );
+
+      return stream.end();
+    });
+  });
+});
+

backend/node_modules/restructure/test/VersionedStruct.js

@@ -0,0 +1,533 @@
+const {VersionedStruct, String:StringT, Pointer, uint8, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('VersionedStruct', function() {
+  describe('decode', function() {
+    it('should get version from number type', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      let stream = new DecodeStream(Buffer.from('\x00\x05devon\x15'));
+      struct.decode(stream).should.deep.equal({
+        version: 0,
+        name: 'devon',
+        age: 21
+      });
+
+      stream = new DecodeStream(Buffer.from('\x01\x0adevon 👍\x15\x00', 'utf8'));
+      return struct.decode(stream).should.deep.equal({
+        version: 1,
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      });
+    });
+
+    it('should throw for unknown version', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      const stream = new DecodeStream(Buffer.from('\x05\x05devon\x15'));
+      return should.throw(() => struct.decode(stream));
+    });
+
+    it('should support common header block', function() {
+      const struct = new VersionedStruct(uint8, {
+        header: {
+          age: uint8,
+          alive: uint8
+        },
+        0: {
+          name: new StringT(uint8, 'ascii')
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          gender: uint8
+        }
+      }
+      );
+
+      let stream = new DecodeStream(Buffer.from('\x00\x15\x01\x05devon'));
+      struct.decode(stream).should.deep.equal({
+        version: 0,
+        age: 21,
+        alive: 1,
+        name: 'devon'
+      });
+
+      stream = new DecodeStream(Buffer.from('\x01\x15\x01\x0adevon 👍\x00', 'utf8'));
+      return struct.decode(stream).should.deep.equal({
+        version: 1,
+        age: 21,
+        alive: 1,
+        name: 'devon 👍',
+        gender: 0
+      });
+    });
+
+    it('should support parent version key', function() {
+      const struct = new VersionedStruct('version', {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      let stream = new DecodeStream(Buffer.from('\x05devon\x15'));
+      struct.decode(stream, {version: 0}).should.deep.equal({
+        version: 0,
+        name: 'devon',
+        age: 21
+      });
+
+      stream = new DecodeStream(Buffer.from('\x0adevon 👍\x15\x00', 'utf8'));
+      return struct.decode(stream, {version: 1}).should.deep.equal({
+        version: 1,
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      });
+    });
+
+    it('should support parent version nested key', function() {
+      const struct = new VersionedStruct('obj.version', {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      let stream = new DecodeStream(Buffer.from('\x05devon\x15'));
+      struct.decode(stream, {obj: {version: 0}}).should.deep.equal({
+        version: 0,
+        name: 'devon',
+        age: 21
+      });
+
+      stream = new DecodeStream(Buffer.from('\x0adevon 👍\x15\x00', 'utf8'));
+      return struct.decode(stream, {obj: {version: 1}}).should.deep.equal({
+        version: 1,
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      });
+    });
+
+    it('should support sub versioned structs', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: new VersionedStruct(uint8, {
+          0: {
+            name: new StringT(uint8)
+          },
+          1: {
+            name: new StringT(uint8),
+            isDesert: uint8
+          }
+        }
+        )
+      }
+      );
+
+      let stream = new DecodeStream(Buffer.from('\x00\x05devon\x15'));
+      struct.decode(stream, {version: 0}).should.deep.equal({
+        version: 0,
+        name: 'devon',
+        age: 21
+      });
+
+      stream = new DecodeStream(Buffer.from('\x01\x00\x05pasta'));
+      struct.decode(stream, {version: 0}).should.deep.equal({
+        version: 0,
+        name: 'pasta'
+      });
+
+      stream = new DecodeStream(Buffer.from('\x01\x01\x09ice cream\x01'));
+      return struct.decode(stream, {version: 0}).should.deep.equal({
+        version: 1,
+        name: 'ice cream',
+        isDesert: 1
+      });
+    });
+
+    return it('should support process hook', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      struct.process = function() {
+        return this.processed = true;
+      };
+
+      const stream = new DecodeStream(Buffer.from('\x00\x05devon\x15'));
+      return struct.decode(stream).should.deep.equal({
+        version: 0,
+        name: 'devon',
+        age: 21,
+        processed: true
+      });
+    });
+  });
+
+  describe('size', function() {
+    it('should compute the correct size', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      let size = struct.size({
+        version: 0,
+        name: 'devon',
+        age: 21
+      });
+
+      size.should.equal(8);
+
+      size = struct.size({
+        version: 1,
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      });
+
+      return size.should.equal(14);
+    });
+
+    it('should throw for unknown version', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      return should.throw(() =>
+        struct.size({
+          version: 5,
+          name: 'devon',
+          age: 21
+        })
+      );
+    });
+
+    it('should support common header block', function() {
+      const struct = new VersionedStruct(uint8, {
+        header: {
+          age: uint8,
+          alive: uint8
+        },
+        0: {
+          name: new StringT(uint8, 'ascii')
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          gender: uint8
+        }
+      }
+      );
+
+      let size = struct.size({
+        version: 0,
+        age: 21,
+        alive: 1,
+        name: 'devon'
+      });
+
+      size.should.equal(9);
+
+      size = struct.size({
+        version: 1,
+        age: 21,
+        alive: 1,
+        name: 'devon 👍',
+        gender: 0
+      });
+
+      return size.should.equal(15);
+    });
+
+    it('should compute the correct size with pointers', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          ptr: new Pointer(uint8, new StringT(uint8))
+        }
+      }
+      );
+
+      const size = struct.size({
+        version: 1,
+        name: 'devon',
+        age: 21,
+        ptr: 'hello'
+      });
+
+      return size.should.equal(15);
+    });
+
+    return it('should throw if no value is given', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(4, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(4, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      return should.throw(() => struct.size()
+      , /not a fixed size/i);
+    });
+  });
+
+  return describe('encode', function() {
+    it('should encode objects to buffers', function(done) {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x00\x05devon\x15\x01\x0adevon 👍\x15\x00', 'utf8'));
+        return done();
+      })
+      );
+
+      struct.encode(stream, {
+        version: 0,
+        name: 'devon',
+        age: 21
+      }
+      );
+
+      struct.encode(stream, {
+        version: 1,
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      }
+      );
+
+      return stream.end();
+    });
+
+    it('should throw for unknown version', function() {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      const stream = new EncodeStream;
+      return should.throw(() =>
+        struct.encode(stream, {
+          version: 5,
+          name: 'devon',
+          age: 21
+        }
+        )
+      );
+    });
+
+    it('should support common header block', function(done) {
+      const struct = new VersionedStruct(uint8, {
+        header: {
+          age: uint8,
+          alive: uint8
+        },
+        0: {
+          name: new StringT(uint8, 'ascii')
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          gender: uint8
+        }
+      }
+      );
+
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x00\x15\x01\x05devon\x01\x15\x01\x0adevon 👍\x00', 'utf8'));
+        return done();
+      })
+      );
+
+      struct.encode(stream, {
+        version: 0,
+        age: 21,
+        alive: 1,
+        name: 'devon'
+      }
+      );
+
+      struct.encode(stream, {
+        version: 1,
+        age: 21,
+        alive: 1,
+        name: 'devon 👍',
+        gender: 0
+      }
+      );
+
+      return stream.end();
+    });
+
+    it('should encode pointer data after structure', function(done) {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          ptr: new Pointer(uint8, new StringT(uint8))
+        }
+      }
+      );
+
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x01\x05devon\x15\x09\x05hello', 'utf8'));
+        return done();
+      })
+      );
+
+      struct.encode(stream, {
+        version: 1,
+        name: 'devon',
+        age: 21,
+        ptr: 'hello'
+      }
+      );
+
+      return stream.end();
+    });
+
+    return it('should support preEncode hook', function(done) {
+      const struct = new VersionedStruct(uint8, {
+        0: {
+          name: new StringT(uint8, 'ascii'),
+          age: uint8
+        },
+        1: {
+          name: new StringT(uint8, 'utf8'),
+          age: uint8,
+          gender: uint8
+        }
+      }
+      );
+
+      struct.preEncode = function() {
+        return this.version = (this.gender != null) ? 1 : 0;
+      };
+
+      const stream = new EncodeStream;
+      stream.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from('\x00\x05devon\x15\x01\x0adevon 👍\x15\x00', 'utf8'));
+        return done();
+      })
+      );
+
+      struct.encode(stream, {
+        name: 'devon',
+        age: 21
+      }
+      );
+
+      struct.encode(stream, {
+        name: 'devon 👍',
+        age: 21,
+        gender: 0
+      }
+      );
+
+      return stream.end();
+    });
+  });
+});