diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3398fbc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+
+# Generated by Typescript compiler
+KaitaiStream.d.ts
diff --git a/.npmignore b/.npmignore
index 2cf6a27..0361ed9 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,2 +1,4 @@
 .npmignore
 .travis.yml
+rollup.config.js
+KaitaiStream.ts
diff --git a/KaitaiStream.js b/KaitaiStream.js
index 1af93e1..9c75462 100644
--- a/KaitaiStream.js
+++ b/KaitaiStream.js
@@ -1,842 +1,816 @@
-// -*- mode: js; js-indent-level: 2; -*-
-'use strict';
-(function (root, factory) {
-  if (typeof define === 'function' && define.amd) {
-    define([], factory);
-  } else if (typeof module === 'object' && module.exports) {
-    module.exports = factory();
-  } else {
-    root.KaitaiStream = factory();
-  }
-}(this, function () {
-
-/**
-  KaitaiStream is an implementation of Kaitai Struct API for JavaScript.
-  Based on DataStream - https://github.com/kig/DataStream.js
-
-  @param {ArrayBuffer} arrayBuffer ArrayBuffer to read from.
-  @param {?Number} byteOffset Offset from arrayBuffer beginning for the KaitaiStream.
-  */
-var KaitaiStream = function(arrayBuffer, byteOffset) {
-  this._byteOffset = byteOffset || 0;
-  if (arrayBuffer instanceof ArrayBuffer) {
-    this.buffer = arrayBuffer;
-  } else if (typeof arrayBuffer == "object") {
-    this.dataView = arrayBuffer;
-    if (byteOffset) {
-      this._byteOffset += byteOffset;
-    }
-  } else {
-    this.buffer = new ArrayBuffer(arrayBuffer || 1);
-  }
-  this.pos = 0;
-  this.alignToByte();
-};
-
-
-KaitaiStream.prototype = {};
-
-/**
-  Dependency configuration data. Holds urls for (optional) dynamic loading
-  of code dependencies from a remote server. For use by (static) processing functions.
-
-  Caller should the supported keys to the asset urls as needed.
-  NOTE: `depUrls` is a static property of KaitaiStream (the factory),like the various
-        processing functions. It is NOT part of the prototype of instances.
-  @type {Object}
-  */
-KaitaiStream.depUrls = {
-  // processZlib uses this and expected a link to a copy of pako.
-  // specifically the pako_inflate.min.js script at:
-  // https://raw.githubusercontent.com/nodeca/pako/master/dist/pako_inflate.min.js
-  zlib: undefined
-};
-
-/**
-  Virtual byte length of the KaitaiStream backing buffer.
-  Updated to be max of original buffer size and last written size.
-  If dynamicSize is false is set to buffer size.
-  @type {number}
-  */
-KaitaiStream.prototype._byteLength = 0;
-
-/**
-  Set/get the backing ArrayBuffer of the KaitaiStream object.
-  The setter updates the DataView to point to the new buffer.
-  @type {Object}
-  */
-Object.defineProperty(KaitaiStream.prototype, 'buffer',
-  { get: function() {
-      this._trimAlloc();
-      return this._buffer;
-    },
-    set: function(v) {
-      this._buffer = v;
-      this._dataView = new DataView(this._buffer, this._byteOffset);
-      this._byteLength = this._buffer.byteLength;
-    } });
-
-/**
-  Set/get the byteOffset of the KaitaiStream object.
-  The setter updates the DataView to point to the new byteOffset.
-  @type {number}
-  */
-Object.defineProperty(KaitaiStream.prototype, 'byteOffset',
-  { get: function() {
-      return this._byteOffset;
-    },
-    set: function(v) {
-      this._byteOffset = v;
-      this._dataView = new DataView(this._buffer, this._byteOffset);
-      this._byteLength = this._buffer.byteLength;
-    } });
-
-/**
-  Set/get the backing DataView of the KaitaiStream object.
-  The setter updates the buffer and byteOffset to point to the DataView values.
-  @type {Object}
-  */
-Object.defineProperty(KaitaiStream.prototype, 'dataView',
-  { get: function() {
-      return this._dataView;
-    },
-    set: function(v) {
-      this._byteOffset = v.byteOffset;
-      this._buffer = v.buffer;
-      this._dataView = new DataView(this._buffer, this._byteOffset);
-      this._byteLength = this._byteOffset + v.byteLength;
-    } });
-
-/**
-  Internal function to trim the KaitaiStream buffer when required.
-  Used for stripping out the extra bytes from the backing buffer when
-  the virtual byteLength is smaller than the buffer byteLength (happens after
-  growing the buffer with writes and not filling the extra space completely).
-
-  @return {null}
-  */
-KaitaiStream.prototype._trimAlloc = function() {
-  if (this._byteLength === this._buffer.byteLength) {
-    return;
-  }
-  var buf = new ArrayBuffer(this._byteLength);
-  var dst = new Uint8Array(buf);
-  var src = new Uint8Array(this._buffer, 0, dst.length);
-  dst.set(src);
-  this.buffer = buf;
-};
-
-// ========================================================================
-// Stream positioning
-// ========================================================================
-
-/**
-  Returns true if the KaitaiStream seek pointer is at the end of buffer and
-  there's no more data to read.
-
-  @return {boolean} True if the seek pointer is at the end of the buffer.
-  */
-KaitaiStream.prototype.isEof = function() {
-  return this.pos >= this.size && this.bitsLeft === 0;
-};
-
-/**
-  Sets the KaitaiStream read/write position to given position.
-  Clamps between 0 and KaitaiStream length.
-
-  @param {number} pos Position to seek to.
-  @return {null}
-  */
-KaitaiStream.prototype.seek = function(pos) {
-  var npos = Math.max(0, Math.min(this.size, pos));
-  this.pos = (isNaN(npos) || !isFinite(npos)) ? 0 : npos;
-};
-
-/**
-  Returns the byte length of the KaitaiStream object.
-  @type {number}
-  */
-Object.defineProperty(KaitaiStream.prototype, 'size',
-  { get: function() {
-    return this._byteLength - this._byteOffset;
-  }});
-
-// ========================================================================
-// Integer numbers
-// ========================================================================
-
-// ------------------------------------------------------------------------
-// Signed
-// ------------------------------------------------------------------------
-
-/**
-  Reads an 8-bit signed int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS1 = function() {
-  this.ensureBytesLeft(1);
-  var v = this._dataView.getInt8(this.pos);
-  this.pos += 1;
-  return v;
-};
-
-// ........................................................................
-// Big-endian
-// ........................................................................
-
-/**
-  Reads a 16-bit big-endian signed int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS2be = function() {
-  this.ensureBytesLeft(2);
-  var v = this._dataView.getInt16(this.pos);
-  this.pos += 2;
-  return v;
-};
-
-/**
-  Reads a 32-bit big-endian signed int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS4be = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getInt32(this.pos);
-  this.pos += 4;
-  return v;
-};
-
-/**
-  Reads a 64-bit big-endian unsigned int from the stream. Note that
-  JavaScript does not support 64-bit integers natively, so it will
-  automatically upgrade internal representation to use IEEE 754
-  double precision float.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS8be = function() {
-  this.ensureBytesLeft(8);
-  var v1 = this.readU4be();
-  var v2 = this.readU4be();
-
-  if ((v1 & 0x80000000) !== 0) {
-    // negative number
-    return -(0x100000000 * (v1 ^ 0xffffffff) + (v2 ^ 0xffffffff)) - 1;
-  } else {
-    return 0x100000000 * v1 + v2;
-  }
-};
-
-// ........................................................................
-// Little-endian
-// ........................................................................
-
-/**
-  Reads a 16-bit little-endian signed int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS2le = function() {
-  this.ensureBytesLeft(2);
-  var v = this._dataView.getInt16(this.pos, true);
-  this.pos += 2;
-  return v;
-};
-
-/**
-  Reads a 32-bit little-endian signed int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS4le = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getInt32(this.pos, true);
-  this.pos += 4;
-  return v;
-};
-
-/**
-  Reads a 64-bit little-endian unsigned int from the stream. Note that
-  JavaScript does not support 64-bit integers natively, so it will
-  automatically upgrade internal representation to use IEEE 754
-  double precision float.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readS8le = function() {
-  this.ensureBytesLeft(8);
-  var v1 = this.readU4le();
-  var v2 = this.readU4le();
-
-  if ((v2 & 0x80000000) !== 0) {
-    // negative number
-    return -(0x100000000 * (v2 ^ 0xffffffff) + (v1 ^ 0xffffffff)) - 1;
-  } else {
-    return 0x100000000 * v2 + v1;
-  }
-};
-
-// ------------------------------------------------------------------------
-// Unsigned
-// ------------------------------------------------------------------------
-
-/**
-  Reads an 8-bit unsigned int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU1 = function() {
-  this.ensureBytesLeft(1);
-  var v = this._dataView.getUint8(this.pos);
-  this.pos += 1;
-  return v;
-};
-
-// ........................................................................
-// Big-endian
-// ........................................................................
-
-/**
-  Reads a 16-bit big-endian unsigned int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU2be = function() {
-  this.ensureBytesLeft(2);
-  var v = this._dataView.getUint16(this.pos);
-  this.pos += 2;
-  return v;
-};
-
-/**
-  Reads a 32-bit big-endian unsigned int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU4be = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getUint32(this.pos);
-  this.pos += 4;
-  return v;
-};
-
-/**
-  Reads a 64-bit big-endian unsigned int from the stream. Note that
-  JavaScript does not support 64-bit integers natively, so it will
-  automatically upgrade internal representation to use IEEE 754
-  double precision float.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU8be = function() {
-  this.ensureBytesLeft(8);
-  var v1 = this.readU4be();
-  var v2 = this.readU4be();
-  return 0x100000000 * v1 + v2;
-};
-
-// ........................................................................
-// Little-endian
-// ........................................................................
-
-/**
-  Reads a 16-bit little-endian unsigned int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU2le = function() {
-  this.ensureBytesLeft(2);
-  var v = this._dataView.getUint16(this.pos, true);
-  this.pos += 2;
-  return v;
-};
-
-/**
-  Reads a 32-bit little-endian unsigned int from the stream.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU4le = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getUint32(this.pos, true);
-  this.pos += 4;
-  return v;
-};
-
-/**
-  Reads a 64-bit little-endian unsigned int from the stream. Note that
-  JavaScript does not support 64-bit integers natively, so it will
-  automatically upgrade internal representation to use IEEE 754
-  double precision float.
-  @return {number} The read number.
- */
-KaitaiStream.prototype.readU8le = function() {
-  this.ensureBytesLeft(8);
-  var v1 = this.readU4le();
-  var v2 = this.readU4le();
-  return 0x100000000 * v2 + v1;
-};
-
-// ========================================================================
-// Floating point numbers
-// ========================================================================
-
-// ------------------------------------------------------------------------
-// Big endian
-// ------------------------------------------------------------------------
-
-KaitaiStream.prototype.readF4be = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getFloat32(this.pos);
-  this.pos += 4;
-  return v;
-};
-
-KaitaiStream.prototype.readF8be = function() {
-  this.ensureBytesLeft(8);
-  var v = this._dataView.getFloat64(this.pos);
-  this.pos += 8;
-  return v;
-};
-
-// ------------------------------------------------------------------------
-// Little endian
-// ------------------------------------------------------------------------
-
-KaitaiStream.prototype.readF4le = function() {
-  this.ensureBytesLeft(4);
-  var v = this._dataView.getFloat32(this.pos, true);
-  this.pos += 4;
-  return v;
-};
-
-KaitaiStream.prototype.readF8le = function() {
-  this.ensureBytesLeft(8);
-  var v = this._dataView.getFloat64(this.pos, true);
-  this.pos += 8;
-  return v;
-};
-
-// ------------------------------------------------------------------------
-// Unaligned bit values
-// ------------------------------------------------------------------------
-
-KaitaiStream.prototype.alignToByte = function() {
-  this.bits = 0;
-  this.bitsLeft = 0;
-};
-
-KaitaiStream.prototype.readBitsIntBe = function(n) {
-  // JS only supports bit operations on 32 bits
-  if (n > 32) {
-    throw new Error(`readBitsIntBe: the maximum supported bit length is 32 (tried to read ${n} bits)`);
-  }
-  var bitsNeeded = n - this.bitsLeft;
-  if (bitsNeeded > 0) {
-    // 1 bit  => 1 byte
-    // 8 bits => 1 byte
-    // 9 bits => 2 bytes
-    var bytesNeeded = Math.ceil(bitsNeeded / 8);
-    var buf = this.readBytes(bytesNeeded);
-    for (var i = 0; i < bytesNeeded; i++) {
-      this.bits <<= 8;
-      this.bits |= buf[i];
-      this.bitsLeft += 8;
+(function (global, factory) {
+    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+    typeof define === 'function' && define.amd ? define(factory) :
+    (global = global || self, global.KaitaiStream = factory());
+}(this, (function () { 'use strict';
+
+    /*! *****************************************************************************
+    Copyright (c) Microsoft Corporation.
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose with or without fee is hereby granted.
+
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+    PERFORMANCE OF THIS SOFTWARE.
+    ***************************************************************************** */
+    /* global Reflect, Promise */
+
+    var extendStatics = function(d, b) {
+        extendStatics = Object.setPrototypeOf ||
+            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+            function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+        return extendStatics(d, b);
+    };
+
+    function __extends(d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
     }
-  }
-
-  // raw mask with required number of 1s, starting from lowest bit
-  var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
-  // shift this.bits to align the highest bits with the mask & derive reading result
-  var shiftBits = this.bitsLeft - n;
-  var res = (this.bits >>> shiftBits) & mask;
-  // clear top bits that we've just read => AND with 1s
-  this.bitsLeft -= n;
-  mask = (1 << this.bitsLeft) - 1;
-  this.bits &= mask;
-
-  return res;
-};
-
-/**
- * Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
- *
- * @deprecated use {@link readBitsIntBe} instead
- */
-KaitaiStream.prototype.readBitsInt = KaitaiStream.prototype.readBitsIntBe;
-
-KaitaiStream.prototype.readBitsIntLe = function(n) {
-  // JS only supports bit operations on 32 bits
-  if (n > 32) {
-    throw new Error(`readBitsIntLe: the maximum supported bit length is 32 (tried to read ${n} bits)`);
-  }
-  var bitsNeeded = n - this.bitsLeft;
-  if (bitsNeeded > 0) {
-      // 1 bit  => 1 byte
-      // 8 bits => 1 byte
-      // 9 bits => 2 bytes
-      var bytesNeeded = Math.ceil(bitsNeeded / 8);
-      var buf = this.readBytes(bytesNeeded);
-      for (var i = 0; i < bytesNeeded; i++) {
-          this.bits |= (buf[i] << this.bitsLeft);
-          this.bitsLeft += 8;
-      }
-  }
-
-  // raw mask with required number of 1s, starting from lowest bit
-  var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
-  // derive reading result
-  var res = this.bits & mask;
-  // remove bottom bits that we've just read by shifting
-  this.bits >>= n;
-  this.bitsLeft -= n;
-
-  return res;
-};
-
-/**
-  Native endianness. Either KaitaiStream.BIG_ENDIAN or KaitaiStream.LITTLE_ENDIAN
-  depending on the platform endianness.
-
-  @type {boolean}
- */
-KaitaiStream.endianness = new Int8Array(new Int16Array([1]).buffer)[0] > 0;
-
-// ========================================================================
-// Byte arrays
-// ========================================================================
-
-KaitaiStream.prototype.readBytes = function(len) {
-  return this.mapUint8Array(len);
-};
-
-KaitaiStream.prototype.readBytesFull = function() {
-  return this.mapUint8Array(this.size - this.pos);
-};
-
-KaitaiStream.prototype.readBytesTerm = function(terminator, include, consume, eosError) {
-  var blen = this.size - this.pos;
-  var u8 = new Uint8Array(this._buffer, this._byteOffset + this.pos);
-  for (var i = 0; i < blen && u8[i] !== terminator; i++); // find first zero byte
-  if (i === blen) {
-    // we've read all the buffer and haven't found the terminator
-    if (eosError) {
-      throw "End of stream reached, but no terminator " + terminator + " found";
-    } else {
-      return this.mapUint8Array(i);
-    }
-  } else {
-    var arr;
-    if (include) {
-      arr = this.mapUint8Array(i + 1);
-    } else {
-      arr = this.mapUint8Array(i);
-    }
-    if (consume) {
-      this.pos += 1;
-    }
-    return arr;
-  }
-};
-
-// Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
-KaitaiStream.prototype.ensureFixedContents = function(expected) {
-  var actual = this.readBytes(expected.length);
-  if (actual.length !== expected.length) {
-    throw new UnexpectedDataError(expected, actual);
-  }
-  var actLen = actual.length;
-  for (var i = 0; i < actLen; i++) {
-    if (actual[i] !== expected[i]) {
-      throw new UnexpectedDataError(expected, actual);
-    }
-  }
-  return actual;
-};
-
-KaitaiStream.bytesStripRight = function(data, padByte) {
-  var newLen = data.length;
-  while (data[newLen - 1] === padByte)
-    newLen--;
-  return data.slice(0, newLen);
-};
-
-KaitaiStream.bytesTerminate = function(data, term, include) {
-  var newLen = 0;
-  var maxLen = data.length;
-  while (newLen < maxLen && data[newLen] !== term)
-    newLen++;
-  if (include && newLen < maxLen)
-    newLen++;
-  return data.slice(0, newLen);
-};
-
-KaitaiStream.bytesToStr = function(arr, encoding) {
-  if (encoding == null || encoding.toLowerCase() === "ascii") {
-    return KaitaiStream.createStringFromArray(arr);
-  } else {
-    if (typeof TextDecoder === 'function') {
-      // we're in the browser that supports TextDecoder
-      return (new TextDecoder(encoding)).decode(arr);
-    } else {
-      // probably we're in node.js
-
-      // check if it's supported natively by node.js Buffer
-      // see https://github.com/nodejs/node/blob/master/lib/buffer.js#L187 for details
-      switch (encoding.toLowerCase()) {
-        case 'utf8':
-        case 'utf-8':
-        case 'ucs2':
-        case 'ucs-2':
-        case 'utf16le':
-        case 'utf-16le':
-          return new Buffer(arr).toString(encoding);
-          break;
-        default:
-          // unsupported encoding, we'll have to resort to iconv-lite
-          if (typeof KaitaiStream.iconvlite === 'undefined')
-            KaitaiStream.iconvlite = require('iconv-lite');
-
-          return KaitaiStream.iconvlite.decode(arr, encoding);
-      }
-    }
-  }
-};
-
-// ========================================================================
-// Byte array processing
-// ========================================================================
-
-KaitaiStream.processXorOne = function(data, key) {
-  var r = new Uint8Array(data.length);
-  var dl = data.length;
-  for (var i = 0; i < dl; i++)
-    r[i] = data[i] ^ key;
-  return r;
-};
-
-KaitaiStream.processXorMany = function(data, key) {
-  var dl = data.length;
-  var r = new Uint8Array(dl);
-  var kl = key.length;
-  var ki = 0;
-  for (var i = 0; i < dl; i++) {
-    r[i] = data[i] ^ key[ki];
-    ki++;
-    if (ki >= kl)
-      ki = 0;
-  }
-  return r;
-};
-
-KaitaiStream.processRotateLeft = function(data, amount, groupSize) {
-  if (groupSize !== 1)
-    throw("unable to rotate group of " + groupSize + " bytes yet");
-
-  var mask = groupSize * 8 - 1;
-  var antiAmount = -amount & mask;
-
-  var r = new Uint8Array(data.length);
-  for (var i = 0; i < data.length; i++)
-    r[i] = (data[i] << amount) & 0xff | (data[i] >> antiAmount);
-
-  return r;
-};
-
-KaitaiStream.processZlib = function(buf) {
-  if (typeof require !== 'undefined')  {
-    // require is available - we're running under node
-    if (typeof KaitaiStream.zlib === 'undefined')
-      KaitaiStream.zlib = require('zlib');
-    // use node's zlib module API
-    var r = KaitaiStream.zlib.inflateSync(
-      Buffer.from(buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength))
-    );
-    return r;
-  } else {
-    // no require() - assume we're running as a web worker in browser.
-    // user should have configured KaitaiStream.depUrls.zlib, if not
-    // we'll throw.
-    if (typeof KaitaiStream.zlib === 'undefined'
-      && typeof KaitaiStream.depUrls.zlib !== 'undefined') {
-      importScripts(KaitaiStream.depUrls.zlib);
-      KaitaiStream.zlib = pako;
-    }
-    // use pako API
-    r = KaitaiStream.zlib.inflate(buf);
-    return r;
-  }
-};
-
-// ========================================================================
-// Misc runtime operations
-// ========================================================================
-
-KaitaiStream.mod = function(a, b) {
-  if (b <= 0)
-    throw "mod divisor <= 0";
-  var r = a % b;
-  if (r < 0)
-    r += b;
-  return r;
-};
-
-KaitaiStream.arrayMin = function(arr) {
-  var min = arr[0];
-  var x;
-  for (var i = 1, n = arr.length; i < n; ++i) {
-    x = arr[i];
-    if (x < min) min = x;
-  }
-  return min;
-};
-
-KaitaiStream.arrayMax = function(arr) {
-  var max = arr[0];
-  var x;
-  for (var i = 1, n = arr.length; i < n; ++i) {
-    x = arr[i];
-    if (x > max) max = x;
-  }
-  return max;
-};
-
-KaitaiStream.byteArrayCompare = function(a, b) {
-  if (a === b)
-    return 0;
-  var al = a.length;
-  var bl = b.length;
-  var minLen = al < bl ? al : bl;
-  for (var i = 0; i < minLen; i++) {
-    var cmp = a[i] - b[i];
-    if (cmp !== 0)
-      return cmp;
-  }
-
-  // Reached the end of at least one of the arrays
-  if (al === bl) {
-    return 0;
-  } else {
-    return al - bl;
-  }
-};
-
-// ========================================================================
-// Internal implementation details
-// ========================================================================
-
-var EOFError = KaitaiStream.EOFError = function(bytesReq, bytesAvail) {
-  this.name = "EOFError";
-  this.message = "requested " + bytesReq + " bytes, but only " + bytesAvail + " bytes available";
-  this.bytesReq = bytesReq;
-  this.bytesAvail = bytesAvail;
-  this.stack = (new Error()).stack;
-};
-
-EOFError.prototype = Object.create(Error.prototype);
-EOFError.prototype.constructor = EOFError;
-
-// Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
-var UnexpectedDataError = KaitaiStream.UnexpectedDataError = function(expected, actual) {
-  this.name = "UnexpectedDataError";
-  this.message = "expected [" + expected + "], but got [" + actual + "]";
-  this.expected = expected;
-  this.actual = actual;
-  this.stack = (new Error()).stack;
-};
-
-UnexpectedDataError.prototype = Object.create(Error.prototype);
-UnexpectedDataError.prototype.constructor = UnexpectedDataError;
-
-var UndecidedEndiannessError = KaitaiStream.UndecidedEndiannessError = function() {
-  this.name = "UndecidedEndiannessError";
-  this.stack = (new Error()).stack;
-};
-
-UndecidedEndiannessError.prototype = Object.create(Error.prototype);
-UndecidedEndiannessError.prototype.constructor = UndecidedEndiannessError;
-
-var ValidationNotEqualError = KaitaiStream.ValidationNotEqualError = function(expected, actual) {
-  this.name = "ValidationNotEqualError";
-  this.message = "not equal, expected [" + expected + "], but got [" + actual + "]";
-  this.expected = expected;
-  this.actual = actual;
-  this.stack = (new Error()).stack;
-};
-
-ValidationNotEqualError.prototype = Object.create(Error.prototype);
-ValidationNotEqualError.prototype.constructor = ValidationNotEqualError;
-
-var ValidationLessThanError = KaitaiStream.ValidationLessThanError = function(min, actual) {
-  this.name = "ValidationLessThanError";
-  this.message = "not in range, min [" + min + "], but got [" + actual + "]";
-  this.min = min;
-  this.actual = actual;
-  this.stack = (new Error()).stack;
-};
-
-ValidationLessThanError.prototype = Object.create(Error.prototype);
-ValidationLessThanError.prototype.constructor = ValidationLessThanError;
-
-var ValidationGreaterThanError = KaitaiStream.ValidationGreaterThanError = function(max, actual) {
-  this.name = "ValidationGreaterThanError";
-  this.message = "not in range, max [" + max + "], but got [" + actual + "]";
-  this.max = max;
-  this.actual = actual;
-  this.stack = (new Error()).stack;
-};
-
-ValidationGreaterThanError.prototype = Object.create(Error.prototype);
-ValidationGreaterThanError.prototype.constructor = ValidationGreaterThanError;
-
-var ValidationNotAnyOfError = KaitaiStream.ValidationNotAnyOfError = function(actual, io, srcPath) {
-  this.name = "ValidationNotAnyOfError";
-  this.message = "not any of the list, got [" + actual + "]";
-  this.actual = actual;
-  this.stack = (new Error()).stack;
-};
-
-ValidationNotAnyOfError.prototype = Object.create(Error.prototype);
-ValidationNotAnyOfError.prototype.constructor = ValidationNotAnyOfError;
-
-/**
-  Ensures that we have an least `length` bytes left in the stream.
-  If that's not true, throws an EOFError.
-
-  @param {number} length Number of bytes to require
-  */
-KaitaiStream.prototype.ensureBytesLeft = function(length) {
-  if (this.pos + length > this.size) {
-    throw new EOFError(length, this.size - this.pos);
-  }
-};
-
-/**
-  Maps a Uint8Array into the KaitaiStream buffer.
-
-  Nice for quickly reading in data.
-
-  @param {number} length Number of elements to map.
-  @return {Object} Uint8Array to the KaitaiStream backing buffer.
-  */
-KaitaiStream.prototype.mapUint8Array = function(length) {
-  length |= 0;
-
-  this.ensureBytesLeft(length);
-
-  var arr = new Uint8Array(this._buffer, this.byteOffset + this.pos, length);
-  this.pos += length;
-  return arr;
-};
-
-/**
-  Creates an array from an array of character codes.
-  Uses String.fromCharCode in chunks for memory efficiency and then concatenates
-  the resulting string chunks.
-
-  @param {array|Uint8Array} array Array of character codes.
-  @return {string} String created from the character codes.
-**/
-KaitaiStream.createStringFromArray = function(array) {
-  var chunk_size = 0x8000;
-  var chunks = [];
-  var useSubarray = typeof array.subarray === 'function';
-  for (var i=0; i < array.length; i += chunk_size) {
-    chunks.push(String.fromCharCode.apply(null, useSubarray ? array.subarray(i, i + chunk_size) : array.slice(i, i + chunk_size)));
-  }
-  return chunks.join("");
-};
-
-return KaitaiStream;
 
-}));
+    // -*- mode: js; js-indent-level: 2; -*-
+    /**
+      KaitaiStream is an implementation of Kaitai Struct API for JavaScript.
+      Based on DataStream - https://github.com/kig/DataStream.js
+
+      @param {ArrayBuffer} arrayBuffer ArrayBuffer to read from.
+      @param {?Number} byteOffset Offset from arrayBuffer beginning for the KaitaiStream.
+      */
+    var KaitaiStream = /** @class */ (function () {
+        function KaitaiStream(arrayBuffer, byteOffset) {
+            /**
+              Virtual byte length of the KaitaiStream backing buffer.
+              Updated to be max of original buffer size and last written size.
+              If dynamicSize is false is set to buffer size.
+              */
+            this._byteLength = 0;
+            this._byteOffset = byteOffset || 0;
+            if (arrayBuffer instanceof ArrayBuffer) {
+                this.buffer = arrayBuffer;
+            }
+            else if (typeof arrayBuffer == "object") {
+                this.dataView = arrayBuffer;
+                if (byteOffset) {
+                    this._byteOffset += byteOffset;
+                }
+            }
+            else {
+                this.buffer = new ArrayBuffer(arrayBuffer || 1);
+            }
+            this.pos = 0;
+            this.alignToByte();
+        }
+        Object.defineProperty(KaitaiStream.prototype, "buffer", {
+            /**
+              Set/get the backing ArrayBuffer of the KaitaiStream object.
+              The setter updates the DataView to point to the new buffer.
+              */
+            get: function () {
+                this._trimAlloc();
+                return this._buffer;
+            },
+            set: function (v) {
+                this._buffer = v;
+                this._dataView = new DataView(this._buffer, this._byteOffset);
+                this._byteLength = this._buffer.byteLength;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(KaitaiStream.prototype, "byteOffset", {
+            /**
+            Set/get the byteOffset of the KaitaiStream object.
+            The setter updates the DataView to point to the new byteOffset.
+            */
+            get: function () {
+                return this._byteOffset;
+            },
+            set: function (v) {
+                this._byteOffset = v;
+                this._dataView = new DataView(this._buffer, this._byteOffset);
+                this._byteLength = this._buffer.byteLength;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        Object.defineProperty(KaitaiStream.prototype, "dataView", {
+            /**
+              Set/get the backing DataView of the KaitaiStream object.
+              The setter updates the buffer and byteOffset to point to the DataView values.
+              */
+            get: function () {
+                return this._dataView;
+            },
+            set: function (v) {
+                this._byteOffset = v.byteOffset;
+                this._buffer = v.buffer;
+                this._dataView = new DataView(this._buffer, this._byteOffset);
+                this._byteLength = this._byteOffset + v.byteLength;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        /**
+         Internal function to trim the KaitaiStream buffer when required.
+         Used for stripping out the extra bytes from the backing buffer when
+         the virtual byteLength is smaller than the buffer byteLength (happens after
+         growing the buffer with writes and not filling the extra space completely).
+        */
+        KaitaiStream.prototype._trimAlloc = function () {
+            if (this._byteLength === this._buffer.byteLength) {
+                return;
+            }
+            var buf = new ArrayBuffer(this._byteLength);
+            var dst = new Uint8Array(buf);
+            var src = new Uint8Array(this._buffer, 0, dst.length);
+            dst.set(src);
+            this.buffer = buf;
+        };
+        // ========================================================================
+        // Stream positioning
+        // ========================================================================
+        /**
+         Returns true if the KaitaiStream seek pointer is at the end of buffer and
+         there's no more data to read.
+      
+         @return {boolean} True if the seek pointer is at the end of the buffer.
+         */
+        KaitaiStream.prototype.isEof = function () {
+            return this.pos >= this.size && this.bitsLeft === 0;
+        };
+        /**
+          Sets the KaitaiStream read/write position to given position.
+          Clamps between 0 and KaitaiStream length.
+        
+          @param {number} pos Position to seek to.
+          */
+        KaitaiStream.prototype.seek = function (pos) {
+            var npos = Math.max(0, Math.min(this.size, pos));
+            this.pos = (isNaN(npos) || !isFinite(npos)) ? 0 : npos;
+        };
+        Object.defineProperty(KaitaiStream.prototype, "size", {
+            /**
+              Returns the byte length of the KaitaiStream object.
+              */
+            get: function () {
+                return this._byteLength - this._byteOffset;
+            },
+            enumerable: false,
+            configurable: true
+        });
+        // ========================================================================
+        // Integer numbers
+        // ========================================================================
+        // ------------------------------------------------------------------------
+        // Signed
+        // ------------------------------------------------------------------------
+        /**
+         Reads an 8-bit signed int from the stream.
+         @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS1 = function () {
+            this.ensureBytesLeft(1);
+            var v = this._dataView.getInt8(this.pos);
+            this.pos += 1;
+            return v;
+        };
+        // ........................................................................
+        // Big-endian
+        // ........................................................................
+        /**
+          Reads a 16-bit big-endian signed int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS2be = function () {
+            this.ensureBytesLeft(2);
+            var v = this._dataView.getInt16(this.pos);
+            this.pos += 2;
+            return v;
+        };
+        /**
+          Reads a 32-bit big-endian signed int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS4be = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getInt32(this.pos);
+            this.pos += 4;
+            return v;
+        };
+        /**
+          Reads a 64-bit big-endian unsigned int from the stream. Note that
+          JavaScript does not support 64-bit integers natively, so it will
+          automatically upgrade internal representation to use IEEE 754
+          double precision float.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS8be = function () {
+            this.ensureBytesLeft(8);
+            var v1 = this.readU4be();
+            var v2 = this.readU4be();
+            if ((v1 & 0x80000000) !== 0) {
+                // negative number
+                return -(0x100000000 * (v1 ^ 0xffffffff) + (v2 ^ 0xffffffff)) - 1;
+            }
+            else {
+                return 0x100000000 * v1 + v2;
+            }
+        };
+        // ........................................................................
+        // Little-endian
+        // ........................................................................
+        /**
+          Reads a 16-bit little-endian signed int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS2le = function () {
+            this.ensureBytesLeft(2);
+            var v = this._dataView.getInt16(this.pos, true);
+            this.pos += 2;
+            return v;
+        };
+        /**
+          Reads a 32-bit little-endian signed int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS4le = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getInt32(this.pos, true);
+            this.pos += 4;
+            return v;
+        };
+        /**
+          Reads a 64-bit little-endian unsigned int from the stream. Note that
+          JavaScript does not support 64-bit integers natively, so it will
+          automatically upgrade internal representation to use IEEE 754
+          double precision float.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readS8le = function () {
+            this.ensureBytesLeft(8);
+            var v1 = this.readU4le();
+            var v2 = this.readU4le();
+            if ((v2 & 0x80000000) !== 0) {
+                // negative number
+                return -(0x100000000 * (v2 ^ 0xffffffff) + (v1 ^ 0xffffffff)) - 1;
+            }
+            else {
+                return 0x100000000 * v2 + v1;
+            }
+        };
+        // ------------------------------------------------------------------------
+        // Unsigned
+        // ------------------------------------------------------------------------
+        /**
+          Reads an 8-bit unsigned int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU1 = function () {
+            this.ensureBytesLeft(1);
+            var v = this._dataView.getUint8(this.pos);
+            this.pos += 1;
+            return v;
+        };
+        // ........................................................................
+        // Big-endian
+        // ........................................................................
+        /**
+          Reads a 16-bit big-endian unsigned int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU2be = function () {
+            this.ensureBytesLeft(2);
+            var v = this._dataView.getUint16(this.pos);
+            this.pos += 2;
+            return v;
+        };
+        /**
+          Reads a 32-bit big-endian unsigned int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU4be = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getUint32(this.pos);
+            this.pos += 4;
+            return v;
+        };
+        /**
+          Reads a 64-bit big-endian unsigned int from the stream. Note that
+          JavaScript does not support 64-bit integers natively, so it will
+          automatically upgrade internal representation to use IEEE 754
+          double precision float.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU8be = function () {
+            this.ensureBytesLeft(8);
+            var v1 = this.readU4be();
+            var v2 = this.readU4be();
+            return 0x100000000 * v1 + v2;
+        };
+        // ........................................................................
+        // Little-endian
+        // ........................................................................
+        /**
+          Reads a 16-bit little-endian unsigned int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU2le = function () {
+            this.ensureBytesLeft(2);
+            var v = this._dataView.getUint16(this.pos, true);
+            this.pos += 2;
+            return v;
+        };
+        /**
+          Reads a 32-bit little-endian unsigned int from the stream.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU4le = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getUint32(this.pos, true);
+            this.pos += 4;
+            return v;
+        };
+        /**
+          Reads a 64-bit little-endian unsigned int from the stream. Note that
+          JavaScript does not support 64-bit integers natively, so it will
+          automatically upgrade internal representation to use IEEE 754
+          double precision float.
+          @return {number} The read number.
+        */
+        KaitaiStream.prototype.readU8le = function () {
+            this.ensureBytesLeft(8);
+            var v1 = this.readU4le();
+            var v2 = this.readU4le();
+            return 0x100000000 * v2 + v1;
+        };
+        // ========================================================================
+        // Floating point numbers
+        // ========================================================================
+        // ------------------------------------------------------------------------
+        // Big endian
+        // ------------------------------------------------------------------------
+        KaitaiStream.prototype.readF4be = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getFloat32(this.pos);
+            this.pos += 4;
+            return v;
+        };
+        KaitaiStream.prototype.readF8be = function () {
+            this.ensureBytesLeft(8);
+            var v = this._dataView.getFloat64(this.pos);
+            this.pos += 8;
+            return v;
+        };
+        // ------------------------------------------------------------------------
+        // Little endian
+        // ------------------------------------------------------------------------
+        KaitaiStream.prototype.readF4le = function () {
+            this.ensureBytesLeft(4);
+            var v = this._dataView.getFloat32(this.pos, true);
+            this.pos += 4;
+            return v;
+        };
+        KaitaiStream.prototype.readF8le = function () {
+            this.ensureBytesLeft(8);
+            var v = this._dataView.getFloat64(this.pos, true);
+            this.pos += 8;
+            return v;
+        };
+        // ------------------------------------------------------------------------
+        // Unaligned bit values
+        // ------------------------------------------------------------------------
+        KaitaiStream.prototype.alignToByte = function () {
+            this.bits = 0;
+            this.bitsLeft = 0;
+        };
+        KaitaiStream.prototype.readBitsIntBe = function (n) {
+            // JS only supports bit operations on 32 bits
+            if (n > 32) {
+                throw new Error("readBitsIntBe: the maximum supported bit length is 32 (tried to read " + n + " bits)");
+            }
+            var bitsNeeded = n - this.bitsLeft;
+            if (bitsNeeded > 0) {
+                // 1 bit  => 1 byte
+                // 8 bits => 1 byte
+                // 9 bits => 2 bytes
+                var bytesNeeded = Math.ceil(bitsNeeded / 8);
+                var buf = this.readBytes(bytesNeeded);
+                for (var i = 0; i < bytesNeeded; i++) {
+                    this.bits <<= 8;
+                    this.bits |= buf[i];
+                    this.bitsLeft += 8;
+                }
+            }
+            // raw mask with required number of 1s, starting from lowest bit
+            var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
+            // shift this.bits to align the highest bits with the mask & derive reading result
+            var shiftBits = this.bitsLeft - n;
+            var res = (this.bits >>> shiftBits) & mask;
+            // clear top bits that we've just read => AND with 1s
+            this.bitsLeft -= n;
+            mask = (1 << this.bitsLeft) - 1;
+            this.bits &= mask;
+            return res;
+        };
+        /**
+         * Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+         *
+         * @deprecated use {@link readBitsIntBe} instead
+         */
+        KaitaiStream.prototype.readBitsInt = function (n) {
+            return this.readBitsIntBe(n);
+        };
+        KaitaiStream.prototype.readBitsIntLe = function (n) {
+            // JS only supports bit operations on 32 bits
+            if (n > 32) {
+                throw new Error("readBitsIntLe: the maximum supported bit length is 32 (tried to read " + n + " bits)");
+            }
+            var bitsNeeded = n - this.bitsLeft;
+            if (bitsNeeded > 0) {
+                // 1 bit  => 1 byte
+                // 8 bits => 1 byte
+                // 9 bits => 2 bytes
+                var bytesNeeded = Math.ceil(bitsNeeded / 8);
+                var buf = this.readBytes(bytesNeeded);
+                for (var i = 0; i < bytesNeeded; i++) {
+                    this.bits |= (buf[i] << this.bitsLeft);
+                    this.bitsLeft += 8;
+                }
+            }
+            // raw mask with required number of 1s, starting from lowest bit
+            var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
+            // derive reading result
+            var res = this.bits & mask;
+            // remove bottom bits that we've just read by shifting
+            this.bits >>= n;
+            this.bitsLeft -= n;
+            return res;
+        };
+        // ========================================================================
+        // Byte arrays
+        // ========================================================================
+        KaitaiStream.prototype.readBytes = function (len) {
+            return this.mapUint8Array(len);
+        };
+        KaitaiStream.prototype.readBytesFull = function () {
+            return this.mapUint8Array(this.size - this.pos);
+        };
+        KaitaiStream.prototype.readBytesTerm = function (terminator, include, consume, eosError) {
+            var blen = this.size - this.pos;
+            var u8 = new Uint8Array(this._buffer, this._byteOffset + this.pos);
+            for (var i = 0; i < blen && u8[i] !== terminator; i++)
+                ; // find first zero byte
+            if (i === blen) {
+                // we've read all the buffer and haven't found the terminator
+                if (eosError) {
+                    throw "End of stream reached, but no terminator " + terminator + " found";
+                }
+                else {
+                    return this.mapUint8Array(i);
+                }
+            }
+            else {
+                var arr;
+                if (include) {
+                    arr = this.mapUint8Array(i + 1);
+                }
+                else {
+                    arr = this.mapUint8Array(i);
+                }
+                if (consume) {
+                    this.pos += 1;
+                }
+                return arr;
+            }
+        };
+        // Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+        KaitaiStream.prototype.ensureFixedContents = function (expected) {
+            var actual = this.readBytes(expected.length);
+            if (actual.length !== expected.length) {
+                throw new KaitaiStream.UnexpectedDataError(expected, actual);
+            }
+            var actLen = actual.length;
+            for (var i = 0; i < actLen; i++) {
+                if (actual[i] !== expected[i]) {
+                    throw new KaitaiStream.UnexpectedDataError(expected, actual);
+                }
+            }
+            return actual;
+        };
+        KaitaiStream.bytesStripRight = function (data, padByte) {
+            var newLen = data.length;
+            while (data[newLen - 1] === padByte)
+                newLen--;
+            return data.slice(0, newLen);
+        };
+        KaitaiStream.bytesTerminate = function (data, term, include) {
+            var newLen = 0;
+            var maxLen = data.length;
+            while (newLen < maxLen && data[newLen] !== term)
+                newLen++;
+            if (include && newLen < maxLen)
+                newLen++;
+            return data.slice(0, newLen);
+        };
+        KaitaiStream.bytesToStr = function (arr, encoding) {
+            if (encoding == null || encoding.toLowerCase() === "ascii") {
+                return KaitaiStream.createStringFromArray(arr);
+            }
+            else {
+                if (typeof TextDecoder === 'function') {
+                    // we're in the browser that supports TextDecoder
+                    return (new TextDecoder(encoding)).decode(arr);
+                }
+                else {
+                    // probably we're in node.js
+                    // check if it's supported natively by node.js Buffer
+                    // see https://github.com/nodejs/node/blob/master/lib/buffer.js#L187 for details
+                    switch (encoding.toLowerCase()) {
+                        case 'utf8':
+                        case 'utf-8':
+                        case 'ucs2':
+                        case 'ucs-2':
+                        case 'utf16le':
+                        case 'utf-16le':
+                            return new Buffer(arr).toString(encoding);
+                        default:
+                            // unsupported encoding, we'll have to resort to iconv-lite
+                            if (typeof KaitaiStream.iconvlite === 'undefined')
+                                KaitaiStream.iconvlite = require('iconv-lite');
+                            return KaitaiStream.iconvlite.decode(arr, encoding);
+                    }
+                }
+            }
+        };
+        // ========================================================================
+        // Byte array processing
+        // ========================================================================
+        KaitaiStream.processXorOne = function (data, key) {
+            var r = new Uint8Array(data.length);
+            var dl = data.length;
+            for (var i = 0; i < dl; i++)
+                r[i] = data[i] ^ key;
+            return r;
+        };
+        KaitaiStream.processXorMany = function (data, key) {
+            var dl = data.length;
+            var r = new Uint8Array(dl);
+            var kl = key.length;
+            var ki = 0;
+            for (var i = 0; i < dl; i++) {
+                r[i] = data[i] ^ key[ki];
+                ki++;
+                if (ki >= kl)
+                    ki = 0;
+            }
+            return r;
+        };
+        KaitaiStream.processRotateLeft = function (data, amount, groupSize) {
+            if (groupSize !== 1)
+                throw ("unable to rotate group of " + groupSize + " bytes yet");
+            var mask = groupSize * 8 - 1;
+            var antiAmount = -amount & mask;
+            var r = new Uint8Array(data.length);
+            for (var i = 0; i < data.length; i++)
+                r[i] = (data[i] << amount) & 0xff | (data[i] >> antiAmount);
+            return r;
+        };
+        KaitaiStream.processZlib = function (buf) {
+            if (typeof require !== 'undefined') {
+                // require is available - we're running under node
+                if (typeof KaitaiStream.zlib === 'undefined')
+                    KaitaiStream.zlib = require('zlib');
+                // use node's zlib module API
+                var r = KaitaiStream.zlib.inflateSync(Buffer.from(buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength)));
+                return r;
+            }
+            else {
+                // no require() - assume we're running as a web worker in browser.
+                // user should have configured KaitaiStream.depUrls.zlib, if not
+                // we'll throw.
+                if (typeof KaitaiStream.zlib === 'undefined'
+                    && typeof KaitaiStream.depUrls.zlib !== 'undefined') {
+                    importScripts(KaitaiStream.depUrls.zlib);
+                    KaitaiStream.zlib = self.pako;
+                }
+                // use pako API
+                r = KaitaiStream.zlib.inflate(buf);
+                return r;
+            }
+        };
+        // ========================================================================
+        // Misc runtime operations
+        // ========================================================================
+        KaitaiStream.mod = function (a, b) {
+            if (b <= 0)
+                throw "mod divisor <= 0";
+            var r = a % b;
+            if (r < 0)
+                r += b;
+            return r;
+        };
+        KaitaiStream.arrayMin = function (arr) {
+            var min = arr[0];
+            var x;
+            for (var i = 1, n = arr.length; i < n; ++i) {
+                x = arr[i];
+                if (x < min)
+                    min = x;
+            }
+            return min;
+        };
+        KaitaiStream.arrayMax = function (arr) {
+            var max = arr[0];
+            var x;
+            for (var i = 1, n = arr.length; i < n; ++i) {
+                x = arr[i];
+                if (x > max)
+                    max = x;
+            }
+            return max;
+        };
+        KaitaiStream.byteArrayCompare = function (a, b) {
+            if (a === b)
+                return 0;
+            var al = a.length;
+            var bl = b.length;
+            var minLen = al < bl ? al : bl;
+            for (var i = 0; i < minLen; i++) {
+                var cmp = a[i] - b[i];
+                if (cmp !== 0)
+                    return cmp;
+            }
+            // Reached the end of at least one of the arrays
+            if (al === bl) {
+                return 0;
+            }
+            else {
+                return al - bl;
+            }
+        };
+        /**
+          Ensures that we have an least `length` bytes left in the stream.
+          If that's not true, throws an EOFError.
+      
+          @param {number} length Number of bytes to require
+          */
+        KaitaiStream.prototype.ensureBytesLeft = function (length) {
+            if (this.pos + length > this.size) {
+                throw new KaitaiStream.EOFError(length, this.size - this.pos);
+            }
+        };
+        /**
+          Maps a Uint8Array into the KaitaiStream buffer.
+        
+          Nice for quickly reading in data.
+        
+          @param {number} length Number of elements to map.
+          @return {Object} Uint8Array to the KaitaiStream backing buffer.
+          */
+        KaitaiStream.prototype.mapUint8Array = function (length) {
+            length |= 0;
+            this.ensureBytesLeft(length);
+            var arr = new Uint8Array(this._buffer, this.byteOffset + this.pos, length);
+            this.pos += length;
+            return arr;
+        };
+        /**
+          Dependency configuration data. Holds urls for (optional) dynamic loading
+          of code dependencies from a remote server. For use by (static) processing functions.
+      
+          Caller should the supported keys to the asset urls as needed.
+          NOTE: `depUrls` is a static property of KaitaiStream (the factory),like the various
+                processing functions. It is NOT part of the prototype of instances.
+          */
+        KaitaiStream.depUrls = {
+            // processZlib uses this and expected a link to a copy of pako.
+            // specifically the pako_inflate.min.js script at:
+            // https://raw.githubusercontent.com/nodeca/pako/master/dist/pako_inflate.min.js
+            zlib: undefined
+        };
+        /**
+          Native endianness. Either KaitaiStream.BIG_ENDIAN or KaitaiStream.LITTLE_ENDIAN
+          depending on the platform endianness.
+        
+          @type {boolean}
+          */
+        KaitaiStream.endianness = new Int8Array(new Int16Array([1]).buffer)[0] > 0;
+        // ========================================================================
+        // Internal implementation details
+        // ========================================================================
+        KaitaiStream.EOFError = /** @class */ (function (_super) {
+            __extends(class_1, _super);
+            function class_1(bytesReq, bytesAvail) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.EOFError.prototype);
+                _this.name = "EOFError";
+                _this.message = "requested " + bytesReq + " bytes, but only " + bytesAvail + " bytes available";
+                _this.bytesReq = bytesReq;
+                _this.bytesAvail = bytesAvail;
+                return _this;
+            }
+            return class_1;
+        }(Error));
+        // Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+        KaitaiStream.UnexpectedDataError = /** @class */ (function (_super) {
+            __extends(class_2, _super);
+            function class_2(expected, actual) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.UnexpectedDataError.prototype);
+                _this.name = "UnexpectedDataError";
+                _this.message = "expected [" + expected + "], but got [" + actual + "]";
+                _this.expected = expected;
+                _this.actual = actual;
+                return _this;
+            }
+            return class_2;
+        }(Error));
+        KaitaiStream.UndecidedEndiannessError = /** @class */ (function (_super) {
+            __extends(class_3, _super);
+            function class_3() {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.UndecidedEndiannessError.prototype);
+                _this.name = "UndecidedEndiannessError";
+                return _this;
+            }
+            return class_3;
+        }(Error));
+        KaitaiStream.ValidationNotEqualError = /** @class */ (function (_super) {
+            __extends(class_4, _super);
+            function class_4(expected, actual) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.ValidationNotEqualError.prototype);
+                _this.name = "ValidationNotEqualError";
+                _this.message = "not equal, expected [" + expected + "], but got [" + actual + "]";
+                _this.expected = expected;
+                _this.actual = actual;
+                return _this;
+            }
+            return class_4;
+        }(Error));
+        KaitaiStream.ValidationLessThanError = /** @class */ (function (_super) {
+            __extends(class_5, _super);
+            function class_5(min, actual) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.ValidationLessThanError.prototype);
+                _this.name = "ValidationLessThanError";
+                _this.message = "not in range, min [" + min + "], but got [" + actual + "]";
+                _this.min = min;
+                _this.actual = actual;
+                return _this;
+            }
+            return class_5;
+        }(Error));
+        KaitaiStream.ValidationGreaterThanError = /** @class */ (function (_super) {
+            __extends(class_6, _super);
+            function class_6(max, actual) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.ValidationGreaterThanError.prototype);
+                _this.name = "ValidationGreaterThanError";
+                _this.message = "not in range, max [" + max + "], but got [" + actual + "]";
+                _this.max = max;
+                _this.actual = actual;
+                return _this;
+            }
+            return class_6;
+        }(Error));
+        KaitaiStream.ValidationNotAnyOfError = /** @class */ (function (_super) {
+            __extends(class_7, _super);
+            function class_7(actual, io, srcPath) {
+                var _this = _super.call(this) || this;
+                Object.setPrototypeOf(_this, KaitaiStream.ValidationNotAnyOfError.prototype);
+                _this.name = "ValidationNotAnyOfError";
+                _this.message = "not any of the list, got [" + actual + "]";
+                _this.actual = actual;
+                return _this;
+            }
+            return class_7;
+        }(Error));
+        /**
+          Creates an array from an array of character codes.
+          Uses String.fromCharCode in chunks for memory efficiency and then concatenates
+          the resulting string chunks.
+        
+          @param {array|Uint8Array} array Array of character codes.
+          @return {string} String created from the character codes.
+          */
+        KaitaiStream.createStringFromArray = function (array) {
+            var chunk_size = 0x8000;
+            var chunks = [];
+            var useSubarray = typeof array.subarray === 'function';
+            for (var i = 0; i < array.length; i += chunk_size) {
+                chunks.push(String.fromCharCode.apply(null, useSubarray ? array.subarray(i, i + chunk_size) : array.slice(i, i + chunk_size)));
+            }
+            return chunks.join("");
+        };
+        return KaitaiStream;
+    }());
+
+    return KaitaiStream;
+
+})));
diff --git a/KaitaiStream.ts b/KaitaiStream.ts
new file mode 100644
index 0000000..346469b
--- /dev/null
+++ b/KaitaiStream.ts
@@ -0,0 +1,850 @@
+// -*- mode: js; js-indent-level: 2; -*-
+
+/**
+  KaitaiStream is an implementation of Kaitai Struct API for JavaScript.
+  Based on DataStream - https://github.com/kig/DataStream.js
+
+  @param {ArrayBuffer} arrayBuffer ArrayBuffer to read from.
+  @param {?Number} byteOffset Offset from arrayBuffer beginning for the KaitaiStream.
+  */
+class KaitaiStream {
+  // Temporary hack since I don't want to declare all members, yet
+  [key: string]: any;
+
+  constructor(arrayBuffer, byteOffset) {
+    this._byteOffset = byteOffset || 0;
+    if (arrayBuffer instanceof ArrayBuffer) {
+      this.buffer = arrayBuffer;
+    } else if (typeof arrayBuffer == "object") {
+      this.dataView = arrayBuffer;
+      if (byteOffset) {
+        this._byteOffset += byteOffset;
+      }
+    } else {
+      this.buffer = new ArrayBuffer(arrayBuffer || 1);
+    }
+    this.pos = 0;
+    this.alignToByte();
+  }
+
+  /**
+    Virtual byte length of the KaitaiStream backing buffer.
+    Updated to be max of original buffer size and last written size.
+    If dynamicSize is false is set to buffer size.
+    */
+  _byteLength: number = 0;
+
+  /**
+    Dependency configuration data. Holds urls for (optional) dynamic loading
+    of code dependencies from a remote server. For use by (static) processing functions.
+
+    Caller should the supported keys to the asset urls as needed.
+    NOTE: `depUrls` is a static property of KaitaiStream (the factory),like the various
+          processing functions. It is NOT part of the prototype of instances.
+    */
+  static depUrls = {
+    // processZlib uses this and expected a link to a copy of pako.
+    // specifically the pako_inflate.min.js script at:
+    // https://raw.githubusercontent.com/nodeca/pako/master/dist/pako_inflate.min.js
+    zlib: undefined
+  };
+
+  static zlib: any;
+  static iconvlite: any;
+
+  /**
+    Set/get the backing ArrayBuffer of the KaitaiStream object.
+    The setter updates the DataView to point to the new buffer.
+    */
+  get buffer() {
+    this._trimAlloc();
+    return this._buffer;
+  }
+  set buffer(v) {
+    this._buffer = v;
+    this._dataView = new DataView(this._buffer, this._byteOffset);
+    this._byteLength = this._buffer.byteLength;
+  }
+
+  /**
+  Set/get the byteOffset of the KaitaiStream object.
+  The setter updates the DataView to point to the new byteOffset.
+  */
+  get byteOffset() {
+    return this._byteOffset;
+  }
+  set byteOffset(v) {
+    this._byteOffset = v;
+    this._dataView = new DataView(this._buffer, this._byteOffset);
+    this._byteLength = this._buffer.byteLength;
+  }
+
+  /**
+    Set/get the backing DataView of the KaitaiStream object.
+    The setter updates the buffer and byteOffset to point to the DataView values.
+    */
+  get dataView() {
+    return this._dataView;
+  }
+  set dataView(v) {
+    this._byteOffset = v.byteOffset;
+    this._buffer = v.buffer;
+    this._dataView = new DataView(this._buffer, this._byteOffset);
+    this._byteLength = this._byteOffset + v.byteLength;
+  }
+
+  /**
+   Internal function to trim the KaitaiStream buffer when required.
+   Used for stripping out the extra bytes from the backing buffer when
+   the virtual byteLength is smaller than the buffer byteLength (happens after
+   growing the buffer with writes and not filling the extra space completely).
+  */
+  _trimAlloc() {
+    if (this._byteLength === this._buffer.byteLength) {
+      return;
+    }
+    var buf = new ArrayBuffer(this._byteLength);
+    var dst = new Uint8Array(buf);
+    var src = new Uint8Array(this._buffer, 0, dst.length);
+    dst.set(src);
+    this.buffer = buf;
+  }
+
+
+  // ========================================================================
+  // Stream positioning
+  // ========================================================================
+
+  /**
+   Returns true if the KaitaiStream seek pointer is at the end of buffer and
+   there's no more data to read.
+
+   @return {boolean} True if the seek pointer is at the end of the buffer.
+   */
+  isEof() {
+    return this.pos >= this.size && this.bitsLeft === 0;
+  };
+
+  /**
+    Sets the KaitaiStream read/write position to given position.
+    Clamps between 0 and KaitaiStream length.
+  
+    @param {number} pos Position to seek to.
+    */
+  seek(pos) {
+    var npos = Math.max(0, Math.min(this.size, pos));
+    this.pos = (isNaN(npos) || !isFinite(npos)) ? 0 : npos;
+  };
+
+  /**
+    Returns the byte length of the KaitaiStream object.
+    */
+  get size() {
+    return this._byteLength - this._byteOffset;
+  }
+
+  // ========================================================================
+  // Integer numbers
+  // ========================================================================
+
+  // ------------------------------------------------------------------------
+  // Signed
+  // ------------------------------------------------------------------------
+
+  /**
+   Reads an 8-bit signed int from the stream.
+   @return {number} The read number.
+  */
+  readS1() {
+    this.ensureBytesLeft(1);
+    var v = this._dataView.getInt8(this.pos);
+    this.pos += 1;
+    return v;
+  };
+
+  // ........................................................................
+  // Big-endian
+  // ........................................................................
+
+  /**
+    Reads a 16-bit big-endian signed int from the stream.
+    @return {number} The read number.
+  */
+  readS2be() {
+    this.ensureBytesLeft(2);
+    var v = this._dataView.getInt16(this.pos);
+    this.pos += 2;
+    return v;
+  };
+
+  /**
+    Reads a 32-bit big-endian signed int from the stream.
+    @return {number} The read number.
+  */
+  readS4be() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getInt32(this.pos);
+    this.pos += 4;
+    return v;
+  };
+
+  /**
+    Reads a 64-bit big-endian unsigned int from the stream. Note that
+    JavaScript does not support 64-bit integers natively, so it will
+    automatically upgrade internal representation to use IEEE 754
+    double precision float.
+    @return {number} The read number.
+  */
+  readS8be() {
+    this.ensureBytesLeft(8);
+    var v1 = this.readU4be();
+    var v2 = this.readU4be();
+
+    if ((v1 & 0x80000000) !== 0) {
+      // negative number
+      return -(0x100000000 * (v1 ^ 0xffffffff) + (v2 ^ 0xffffffff)) - 1;
+    } else {
+      return 0x100000000 * v1 + v2;
+    }
+  };
+
+  // ........................................................................
+  // Little-endian
+  // ........................................................................
+
+  /**
+    Reads a 16-bit little-endian signed int from the stream.
+    @return {number} The read number.
+  */
+  readS2le() {
+    this.ensureBytesLeft(2);
+    var v = this._dataView.getInt16(this.pos, true);
+    this.pos += 2;
+    return v;
+  };
+
+  /**
+    Reads a 32-bit little-endian signed int from the stream.
+    @return {number} The read number.
+  */
+  readS4le() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getInt32(this.pos, true);
+    this.pos += 4;
+    return v;
+  };
+
+  /**
+    Reads a 64-bit little-endian unsigned int from the stream. Note that
+    JavaScript does not support 64-bit integers natively, so it will
+    automatically upgrade internal representation to use IEEE 754
+    double precision float.
+    @return {number} The read number.
+  */
+  readS8le() {
+    this.ensureBytesLeft(8);
+    var v1 = this.readU4le();
+    var v2 = this.readU4le();
+
+    if ((v2 & 0x80000000) !== 0) {
+      // negative number
+      return -(0x100000000 * (v2 ^ 0xffffffff) + (v1 ^ 0xffffffff)) - 1;
+    } else {
+      return 0x100000000 * v2 + v1;
+    }
+  };
+
+  // ------------------------------------------------------------------------
+  // Unsigned
+  // ------------------------------------------------------------------------
+
+  /**
+    Reads an 8-bit unsigned int from the stream.
+    @return {number} The read number.
+  */
+  readU1() {
+    this.ensureBytesLeft(1);
+    var v = this._dataView.getUint8(this.pos);
+    this.pos += 1;
+    return v;
+  };
+
+  // ........................................................................
+  // Big-endian
+  // ........................................................................
+
+  /**
+    Reads a 16-bit big-endian unsigned int from the stream.
+    @return {number} The read number.
+  */
+  readU2be() {
+    this.ensureBytesLeft(2);
+    var v = this._dataView.getUint16(this.pos);
+    this.pos += 2;
+    return v;
+  };
+
+  /**
+    Reads a 32-bit big-endian unsigned int from the stream.
+    @return {number} The read number.
+  */
+  readU4be() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getUint32(this.pos);
+    this.pos += 4;
+    return v;
+  };
+
+  /**
+    Reads a 64-bit big-endian unsigned int from the stream. Note that
+    JavaScript does not support 64-bit integers natively, so it will
+    automatically upgrade internal representation to use IEEE 754
+    double precision float.
+    @return {number} The read number.
+  */
+  readU8be() {
+    this.ensureBytesLeft(8);
+    var v1 = this.readU4be();
+    var v2 = this.readU4be();
+    return 0x100000000 * v1 + v2;
+  }
+
+  // ........................................................................
+  // Little-endian
+  // ........................................................................
+
+  /**
+    Reads a 16-bit little-endian unsigned int from the stream.
+    @return {number} The read number.
+  */
+  readU2le() {
+    this.ensureBytesLeft(2);
+    var v = this._dataView.getUint16(this.pos, true);
+    this.pos += 2;
+    return v;
+  }
+
+  /**
+    Reads a 32-bit little-endian unsigned int from the stream.
+    @return {number} The read number.
+  */
+  readU4le() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getUint32(this.pos, true);
+    this.pos += 4;
+    return v;
+  }
+
+  /**
+    Reads a 64-bit little-endian unsigned int from the stream. Note that
+    JavaScript does not support 64-bit integers natively, so it will
+    automatically upgrade internal representation to use IEEE 754
+    double precision float.
+    @return {number} The read number.
+  */
+  readU8le() {
+    this.ensureBytesLeft(8);
+    var v1 = this.readU4le();
+    var v2 = this.readU4le();
+    return 0x100000000 * v2 + v1;
+  };
+
+
+  // ========================================================================
+  // Floating point numbers
+  // ========================================================================
+
+  // ------------------------------------------------------------------------
+  // Big endian
+  // ------------------------------------------------------------------------
+
+  readF4be() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getFloat32(this.pos);
+    this.pos += 4;
+    return v;
+  };
+
+  readF8be() {
+    this.ensureBytesLeft(8);
+    var v = this._dataView.getFloat64(this.pos);
+    this.pos += 8;
+    return v;
+  };
+
+  // ------------------------------------------------------------------------
+  // Little endian
+  // ------------------------------------------------------------------------
+
+  readF4le() {
+    this.ensureBytesLeft(4);
+    var v = this._dataView.getFloat32(this.pos, true);
+    this.pos += 4;
+    return v;
+  };
+
+  readF8le() {
+    this.ensureBytesLeft(8);
+    var v = this._dataView.getFloat64(this.pos, true);
+    this.pos += 8;
+    return v;
+  };
+
+  // ------------------------------------------------------------------------
+  // Unaligned bit values
+  // ------------------------------------------------------------------------
+
+  alignToByte() {
+    this.bits = 0;
+    this.bitsLeft = 0;
+  };
+
+  readBitsIntBe(n) {
+    // JS only supports bit operations on 32 bits
+    if (n > 32) {
+      throw new Error(`readBitsIntBe: the maximum supported bit length is 32 (tried to read ${n} bits)`);
+    }
+    var bitsNeeded = n - this.bitsLeft;
+    if (bitsNeeded > 0) {
+      // 1 bit  => 1 byte
+      // 8 bits => 1 byte
+      // 9 bits => 2 bytes
+      var bytesNeeded = Math.ceil(bitsNeeded / 8);
+      var buf = this.readBytes(bytesNeeded);
+      for (var i = 0; i < bytesNeeded; i++) {
+        this.bits <<= 8;
+        this.bits |= buf[i];
+        this.bitsLeft += 8;
+      }
+    }
+
+    // raw mask with required number of 1s, starting from lowest bit
+    var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
+    // shift this.bits to align the highest bits with the mask & derive reading result
+    var shiftBits = this.bitsLeft - n;
+    var res = (this.bits >>> shiftBits) & mask;
+    // clear top bits that we've just read => AND with 1s
+    this.bitsLeft -= n;
+    mask = (1 << this.bitsLeft) - 1;
+    this.bits &= mask;
+
+    return res;
+  };
+
+  /**
+   * Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+   *
+   * @deprecated use {@link readBitsIntBe} instead
+   */
+  readBitsInt(n) {
+    return this.readBitsIntBe(n);
+  }
+
+  readBitsIntLe(n) {
+    // JS only supports bit operations on 32 bits
+    if (n > 32) {
+      throw new Error(`readBitsIntLe: the maximum supported bit length is 32 (tried to read ${n} bits)`);
+    }
+    var bitsNeeded = n - this.bitsLeft;
+    if (bitsNeeded > 0) {
+      // 1 bit  => 1 byte
+      // 8 bits => 1 byte
+      // 9 bits => 2 bytes
+      var bytesNeeded = Math.ceil(bitsNeeded / 8);
+      var buf = this.readBytes(bytesNeeded);
+      for (var i = 0; i < bytesNeeded; i++) {
+        this.bits |= (buf[i] << this.bitsLeft);
+        this.bitsLeft += 8;
+      }
+    }
+
+    // raw mask with required number of 1s, starting from lowest bit
+    var mask = n === 32 ? 0xffffffff : (1 << n) - 1;
+    // derive reading result
+    var res = this.bits & mask;
+    // remove bottom bits that we've just read by shifting
+    this.bits >>= n;
+    this.bitsLeft -= n;
+
+    return res;
+  };
+
+  /**
+    Native endianness. Either KaitaiStream.BIG_ENDIAN or KaitaiStream.LITTLE_ENDIAN
+    depending on the platform endianness.
+  
+    @type {boolean}
+    */
+  static endianness = new Int8Array(new Int16Array([1]).buffer)[0] > 0;
+
+  // ========================================================================
+  // Byte arrays
+  // ========================================================================
+
+  readBytes(len) {
+    return this.mapUint8Array(len);
+  };
+
+  readBytesFull() {
+    return this.mapUint8Array(this.size - this.pos);
+  };
+
+  readBytesTerm(terminator, include, consume, eosError) {
+    var blen = this.size - this.pos;
+    var u8 = new Uint8Array(this._buffer, this._byteOffset + this.pos);
+    for (var i = 0; i < blen && u8[i] !== terminator; i++); // find first zero byte
+    if (i === blen) {
+      // we've read all the buffer and haven't found the terminator
+      if (eosError) {
+        throw "End of stream reached, but no terminator " + terminator + " found";
+      } else {
+        return this.mapUint8Array(i);
+      }
+    } else {
+      var arr;
+      if (include) {
+        arr = this.mapUint8Array(i + 1);
+      } else {
+        arr = this.mapUint8Array(i);
+      }
+      if (consume) {
+        this.pos += 1;
+      }
+      return arr;
+    }
+  };
+
+  // Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+  ensureFixedContents(expected) {
+    var actual = this.readBytes(expected.length);
+    if (actual.length !== expected.length) {
+      throw new KaitaiStream.UnexpectedDataError(expected, actual);
+    }
+    var actLen = actual.length;
+    for (var i = 0; i < actLen; i++) {
+      if (actual[i] !== expected[i]) {
+        throw new KaitaiStream.UnexpectedDataError(expected, actual);
+      }
+    }
+    return actual;
+  };
+
+  static bytesStripRight(data, padByte) {
+    var newLen = data.length;
+    while (data[newLen - 1] === padByte)
+      newLen--;
+    return data.slice(0, newLen);
+  };
+
+  static bytesTerminate(data, term, include) {
+    var newLen = 0;
+    var maxLen = data.length;
+    while (newLen < maxLen && data[newLen] !== term)
+      newLen++;
+    if (include && newLen < maxLen)
+      newLen++;
+    return data.slice(0, newLen);
+  };
+
+  static bytesToStr(arr, encoding) {
+    if (encoding == null || encoding.toLowerCase() === "ascii") {
+      return KaitaiStream.createStringFromArray(arr);
+    } else {
+      if (typeof TextDecoder === 'function') {
+        // we're in the browser that supports TextDecoder
+        return (new TextDecoder(encoding)).decode(arr);
+      } else {
+        // probably we're in node.js
+
+        // check if it's supported natively by node.js Buffer
+        // see https://github.com/nodejs/node/blob/master/lib/buffer.js#L187 for details
+        switch (encoding.toLowerCase()) {
+          case 'utf8':
+          case 'utf-8':
+          case 'ucs2':
+          case 'ucs-2':
+          case 'utf16le':
+          case 'utf-16le':
+            return new Buffer(arr).toString(encoding);
+            break;
+          default:
+            // unsupported encoding, we'll have to resort to iconv-lite
+            if (typeof KaitaiStream.iconvlite === 'undefined')
+              KaitaiStream.iconvlite = require('iconv-lite');
+
+            return KaitaiStream.iconvlite.decode(arr, encoding);
+        }
+      }
+    }
+  };
+
+  // ========================================================================
+  // Byte array processing
+  // ========================================================================
+
+  static processXorOne(data, key) {
+    var r = new Uint8Array(data.length);
+    var dl = data.length;
+    for (var i = 0; i < dl; i++)
+      r[i] = data[i] ^ key;
+    return r;
+  };
+
+  static processXorMany(data, key) {
+    var dl = data.length;
+    var r = new Uint8Array(dl);
+    var kl = key.length;
+    var ki = 0;
+    for (var i = 0; i < dl; i++) {
+      r[i] = data[i] ^ key[ki];
+      ki++;
+      if (ki >= kl)
+        ki = 0;
+    }
+    return r;
+  };
+
+  static processRotateLeft(data, amount, groupSize) {
+    if (groupSize !== 1)
+      throw ("unable to rotate group of " + groupSize + " bytes yet");
+
+    var mask = groupSize * 8 - 1;
+    var antiAmount = -amount & mask;
+
+    var r = new Uint8Array(data.length);
+    for (var i = 0; i < data.length; i++)
+      r[i] = (data[i] << amount) & 0xff | (data[i] >> antiAmount);
+
+    return r;
+  };
+
+  static processZlib(buf) {
+    if (typeof require !== 'undefined') {
+      // require is available - we're running under node
+      if (typeof KaitaiStream.zlib === 'undefined')
+        KaitaiStream.zlib = require('zlib');
+      // use node's zlib module API
+      var r = KaitaiStream.zlib.inflateSync(
+        Buffer.from(buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength))
+      );
+      return r;
+    } else {
+      // no require() - assume we're running as a web worker in browser.
+      // user should have configured KaitaiStream.depUrls.zlib, if not
+      // we'll throw.
+      if (typeof KaitaiStream.zlib === 'undefined'
+        && typeof KaitaiStream.depUrls.zlib !== 'undefined') {
+        importScripts(KaitaiStream.depUrls.zlib);
+        KaitaiStream.zlib = (self as any).pako;
+      }
+      // use pako API
+      r = KaitaiStream.zlib.inflate(buf);
+      return r;
+    }
+  };
+
+  // ========================================================================
+  // Misc runtime operations
+  // ========================================================================
+
+  static mod(a, b) {
+    if (b <= 0)
+      throw "mod divisor <= 0";
+    var r = a % b;
+    if (r < 0)
+      r += b;
+    return r;
+  };
+
+  static arrayMin(arr) {
+    var min = arr[0];
+    var x;
+    for (var i = 1, n = arr.length; i < n; ++i) {
+      x = arr[i];
+      if (x < min) min = x;
+    }
+    return min;
+  };
+
+  static arrayMax(arr) {
+    var max = arr[0];
+    var x;
+    for (var i = 1, n = arr.length; i < n; ++i) {
+      x = arr[i];
+      if (x > max) max = x;
+    }
+    return max;
+  };
+
+  static byteArrayCompare(a, b) {
+    if (a === b)
+      return 0;
+    var al = a.length;
+    var bl = b.length;
+    var minLen = al < bl ? al : bl;
+    for (var i = 0; i < minLen; i++) {
+      var cmp = a[i] - b[i];
+      if (cmp !== 0)
+        return cmp;
+    }
+
+    // Reached the end of at least one of the arrays
+    if (al === bl) {
+      return 0;
+    } else {
+      return al - bl;
+    }
+  };
+
+  // ========================================================================
+  // Internal implementation details
+  // ========================================================================
+
+  static EOFError = class extends Error {
+    bytesReq: number;
+    bytesAvail: number;
+
+    constructor(bytesReq, bytesAvail) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.EOFError.prototype);
+      this.name = "EOFError";
+      this.message = "requested " + bytesReq + " bytes, but only " + bytesAvail + " bytes available";
+      this.bytesReq = bytesReq;
+      this.bytesAvail = bytesAvail;
+    }
+  }
+
+  // Unused since Kaitai Struct Compiler v0.9+ - compatibility with older versions
+  static UnexpectedDataError = class extends Error {
+    expected: any;
+    actual: any;
+
+    constructor(expected, actual) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.UnexpectedDataError.prototype);
+      this.name = "UnexpectedDataError";
+      this.message = "expected [" + expected + "], but got [" + actual + "]";
+      this.expected = expected;
+      this.actual = actual;
+    }
+  };
+
+  static UndecidedEndiannessError = class extends Error {
+    constructor() {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.UndecidedEndiannessError.prototype);
+      this.name = "UndecidedEndiannessError";
+    }
+  };
+
+  static ValidationNotEqualError = class extends Error {
+    expected: any;
+    actual: any;
+
+    constructor(expected, actual) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.ValidationNotEqualError.prototype);
+      this.name = "ValidationNotEqualError";
+      this.message = "not equal, expected [" + expected + "], but got [" + actual + "]";
+      this.expected = expected;
+      this.actual = actual;
+    }
+  };
+
+  static ValidationLessThanError = class extends Error {
+    min: any;
+    actual: any;
+
+    constructor(min, actual) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.ValidationLessThanError.prototype);
+      this.name = "ValidationLessThanError";
+      this.message = "not in range, min [" + min + "], but got [" + actual + "]";
+      this.min = min;
+      this.actual = actual;
+    }
+  };
+
+  static ValidationGreaterThanError = class extends Error {
+    max: any;
+    actual: any;
+
+    constructor(max, actual) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.ValidationGreaterThanError.prototype);
+      this.name = "ValidationGreaterThanError";
+      this.message = "not in range, max [" + max + "], but got [" + actual + "]";
+      this.max = max;
+      this.actual = actual;
+    }
+  };
+
+  static ValidationNotAnyOfError = class extends Error {
+    actual: any;
+
+    constructor(actual, io, srcPath) {
+      super();
+      // Workaround https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work
+      Object.setPrototypeOf(this, KaitaiStream.ValidationNotAnyOfError.prototype);
+      this.name = "ValidationNotAnyOfError";
+      this.message = "not any of the list, got [" + actual + "]";
+      this.actual = actual;
+    }
+  };
+
+  /**
+    Ensures that we have an least `length` bytes left in the stream.
+    If that's not true, throws an EOFError.
+
+    @param {number} length Number of bytes to require
+    */
+  ensureBytesLeft(length) {
+    if (this.pos + length > this.size) {
+      throw new KaitaiStream.EOFError(length, this.size - this.pos);
+    }
+  };
+
+  /**
+    Maps a Uint8Array into the KaitaiStream buffer.
+  
+    Nice for quickly reading in data.
+  
+    @param {number} length Number of elements to map.
+    @return {Object} Uint8Array to the KaitaiStream backing buffer.
+    */
+  mapUint8Array(length) {
+    length |= 0;
+
+    this.ensureBytesLeft(length);
+
+    var arr = new Uint8Array(this._buffer, this.byteOffset + this.pos, length);
+    this.pos += length;
+    return arr;
+  };
+
+  /**
+    Creates an array from an array of character codes.
+    Uses String.fromCharCode in chunks for memory efficiency and then concatenates
+    the resulting string chunks.
+  
+    @param {array|Uint8Array} array Array of character codes.
+    @return {string} String created from the character codes.
+    */
+  static createStringFromArray = function (array) {
+    var chunk_size = 0x8000;
+    var chunks = [];
+    var useSubarray = typeof array.subarray === 'function';
+    for (var i = 0; i < array.length; i += chunk_size) {
+      chunks.push(String.fromCharCode.apply(null, useSubarray ? array.subarray(i, i + chunk_size) : array.slice(i, i + chunk_size)));
+    }
+    return chunks.join("");
+  };
+}
+
+export default KaitaiStream;
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..a31ec9a
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,5 @@
+import KaitaiStream = require("./KaitaiStream");
+declare const _default: {
+    KaitaiStream: typeof KaitaiStream;
+};
+export = _default;
diff --git a/package-lock.json b/package-lock.json
index 0a2a1c2..4f7fc79 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,5 +1,96 @@
 {
   "name": "kaitai-struct",
   "version": "0.9.0-SNAPSHOT.3",
-  "lockfileVersion": 1
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@rollup/plugin-typescript": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@rollup/plugin-typescript/-/plugin-typescript-4.1.1.tgz",
+      "integrity": "sha512-KYZCn1Iw9hZWkeEPqPs5YjlmvSjR7UdezVca8z0e8rm/29wU24UD9Y4IZHhnc9tm749hzsgBTiOUxA85gfShEQ==",
+      "dev": true,
+      "requires": {
+        "@rollup/pluginutils": "^3.0.1",
+        "resolve": "^1.14.1"
+      }
+    },
+    "@rollup/pluginutils": {
+      "version": "3.0.10",
+      "resolved": "https://registry.npmjs.org/@rollup/pluginutils/-/pluginutils-3.0.10.tgz",
+      "integrity": "sha512-d44M7t+PjmMrASHbhgpSbVgtL6EFyX7J4mYxwQ/c5eoaE6N2VgCgEcWVzNnwycIloti+/MpwFr8qfw+nRw00sw==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.39",
+        "estree-walker": "^1.0.1",
+        "picomatch": "^2.2.2"
+      }
+    },
+    "@types/estree": {
+      "version": "0.0.39",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
+      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "14.0.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.1.tgz",
+      "integrity": "sha512-FAYBGwC+W6F9+huFIDtn43cpy7+SzG+atzRiTfdp3inUKL2hXnd4rG8hylJLIh4+hqrQy1P17kvJByE/z825hA==",
+      "dev": true
+    },
+    "estree-walker": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/estree-walker/-/estree-walker-1.0.1.tgz",
+      "integrity": "sha512-1fMXF3YP4pZZVozF8j/ZLfvnR8NSIljt56UhbZ5PeeDmmGHpgpdwQt7ITlGvYaQukCvuBRMLEiKiYC+oeIg4cg==",
+      "dev": true
+    },
+    "fsevents": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
+      "integrity": "sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==",
+      "dev": true,
+      "optional": true
+    },
+    "path-parse": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
+      "integrity": "sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==",
+      "dev": true
+    },
+    "picomatch": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz",
+      "integrity": "sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==",
+      "dev": true
+    },
+    "resolve": {
+      "version": "1.17.0",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.17.0.tgz",
+      "integrity": "sha512-ic+7JYiV8Vi2yzQGFWOkiZD5Z9z7O2Zhm9XMaTxdJExKasieFCr+yXZ/WmXsckHiKl12ar0y6XiXDx3m4RHn1w==",
+      "dev": true,
+      "requires": {
+        "path-parse": "^1.0.6"
+      }
+    },
+    "rollup": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-2.10.0.tgz",
+      "integrity": "sha512-7BmpEfUN9P6esJzWIn3DmR//90mW6YwYB1t3y48LpF8ITpYtL8s1kEirMKqUu44dVH/6a/rs0EuwYVL3FuRDoA==",
+      "dev": true,
+      "requires": {
+        "fsevents": "~2.1.2"
+      }
+    },
+    "tslib": {
+      "version": "1.13.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.13.0.tgz",
+      "integrity": "sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==",
+      "dev": true
+    },
+    "typescript": {
+      "version": "3.9.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.2.tgz",
+      "integrity": "sha512-q2ktq4n/uLuNNShyayit+DTobV2ApPEo/6so68JaD5ojvc/6GClBipedB9zNWYxRSAlZXAe405Rlijzl6qDiSw==",
+      "dev": true
+    }
+  }
 }
diff --git a/package.json b/package.json
index 58d7d33..a0eaf4c 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "0.9.0-SNAPSHOT.3",
   "description": "Kaitai Struct: runtime library for Javascript",
   "main": "index.js",
+  "types": "index.d.ts",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/kaitai-io/kaitai_struct_javascript_runtime.git"
@@ -26,5 +27,16 @@
   "bugs": {
     "url": "https://github.com/kaitai-io/kaitai_struct_javascript_runtime/issues"
   },
-  "homepage": "https://github.com/kaitai-io/kaitai_struct_javascript_runtime#readme"
+  "homepage": "https://github.com/kaitai-io/kaitai_struct_javascript_runtime#readme",
+  "scripts": {
+    "build": "rollup -c",
+    "prepublish": "npm run build"
+  },
+  "devDependencies": {
+    "@rollup/plugin-typescript": "^4.1.1",
+    "@types/node": "^14.0.1",
+    "rollup": "^2.10.0",
+    "tslib": "^1.12.0",
+    "typescript": "^3.9.2"
+  }
 }
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..b6ad679
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,11 @@
+import typescript from '@rollup/plugin-typescript';
+
+export default [{
+    input: 'KaitaiStream.ts',
+    output: {
+        dir: '.',
+        format: 'umd',
+        name: 'KaitaiStream'
+    },
+    plugins: [typescript()]
+}];
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..7909ea5
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,68 @@
+{
+  "compilerOptions": {
+    /* Visit https://aka.ms/tsconfig.json to read more about this file */
+
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
+    "module": "es2015",                       /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./",                           /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    // "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    // "esModuleInterop": true,               /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "skipLibCheck": true,                     /* Skip type checking of declaration files. */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  },
+  "exclude": []
+}