Merge pull request #141 from mikewesthad/master

Node fix: allowing a local langPath to be used when looking for language files
7 years ago · 8e9f7861ac
parent b99bf1cee5 69678dd86b
commit 8e9f7861ac
5 changed files with 3256 additions and 78 deletions
--- a/dist/tesseract.js
+++ b/dist/tesseract.js
@ -169,6 +169,10 @@ process.off = noop;
 process.removeListener = noop;
 process.removeAllListeners = noop;
 process.emit = noop;
+process.prependListener = noop;
+process.prependOnceListener = noop;
+
+process.listeners = function (name) { return [] }

 process.binding = function (name) {
    throw new Error('process.binding is not supported');
@ -203,6 +207,7 @@ module.exports={
    "browserify": "^13.1.0",
    "envify": "^3.4.1",
    "http-server": "^0.9.0",
+    "isomorphic-fetch": "^2.2.1",
    "pako": "^1.0.3",
    "watchify": "^3.7.0"
  },
@ -225,6 +230,7 @@ module.exports={
  },
  "homepage": "https://github.com/naptha/tesseract.js"
 }
+
 },{}],3:[function(require,module,exports){
 (function (process){
 'use strict';
@ -571,6 +577,8 @@ var TesseractWorker = function () {
 		value: function terminate() {
 			if (this.worker) adapter.terminateWorker(this);
 			this.worker = null;
+			this._currentJob = null;
+			this._queue = [];
 		}
 	}, {
 		key: '_delay',
--- a/dist/worker.js
+++ b/dist/worker.js
@ -82,7 +82,7 @@ AbstractChainedBatch.prototype.write = function (options, callback) {

 module.exports = AbstractChainedBatch
 }).call(this,require('_process'))
-},{"_process":32}],2:[function(require,module,exports){
+},{"_process":31}],2:[function(require,module,exports){
 (function (process){
 /* Copyright (c) 2013 Rod Vagg, MIT License */

@ -135,7 +135,7 @@ AbstractIterator.prototype.end = function (callback) {
 module.exports = AbstractIterator

 }).call(this,require('_process'))
-},{"_process":32}],3:[function(require,module,exports){
+},{"_process":31}],3:[function(require,module,exports){
 (function (Buffer,process){
 /* Copyright (c) 2013 Rod Vagg, MIT License */

@ -395,7 +395,7 @@ module.exports.AbstractIterator     = AbstractIterator
 module.exports.AbstractChainedBatch = AbstractChainedBatch

 }).call(this,{"isBuffer":require("../is-buffer/index.js")},require('_process'))
-},{"../is-buffer/index.js":10,"./abstract-chained-batch":1,"./abstract-iterator":2,"_process":32,"xtend":4}],4:[function(require,module,exports){
+},{"../is-buffer/index.js":9,"./abstract-chained-batch":1,"./abstract-iterator":2,"_process":31,"xtend":4}],4:[function(require,module,exports){
 module.exports = extend

 function extend() {
@ -450,22 +450,22 @@ function placeHoldersCount (b64) {

 function byteLength (b64) {
  // base64 is 4/3 + up to two characters of the original data
-  return b64.length * 3 / 4 - placeHoldersCount(b64)
+  return (b64.length * 3 / 4) - placeHoldersCount(b64)
 }

 function toByteArray (b64) {
-  var i, j, l, tmp, placeHolders, arr
+  var i, l, tmp, placeHolders, arr
  var len = b64.length
  placeHolders = placeHoldersCount(b64)

-  arr = new Arr(len * 3 / 4 - placeHolders)
+  arr = new Arr((len * 3 / 4) - placeHolders)

  // if there are placeholders, only get up to the last complete 4 chars
  l = placeHolders > 0 ? len - 4 : len

  var L = 0

-  for (i = 0, j = 0; i < l; i += 4, j += 3) {
+  for (i = 0; i < l; i += 4) {
    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
    arr[L++] = (tmp >> 16) & 0xFF
    arr[L++] = (tmp >> 8) & 0xFF
@ -2323,7 +2323,7 @@ function isnan (val) {
 }

 }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"base64-js":5,"ieee754":8,"isarray":11}],7:[function(require,module,exports){
+},{"base64-js":5,"ieee754":8,"isarray":10}],7:[function(require,module,exports){
 /*global window:false, self:false, define:false, module:false */

 /**
@ -3817,31 +3817,6 @@ exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
 }

 },{}],9:[function(require,module,exports){
-if (typeof Object.create === 'function') {
-  // implementation from standard node.js 'util' module
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    ctor.prototype = Object.create(superCtor.prototype, {
-      constructor: {
-        value: ctor,
-        enumerable: false,
-        writable: true,
-        configurable: true
-      }
-    });
-  };
-} else {
-  // old school shim for old browsers
-  module.exports = function inherits(ctor, superCtor) {
-    ctor.super_ = superCtor
-    var TempCtor = function () {}
-    TempCtor.prototype = superCtor.prototype
-    ctor.prototype = new TempCtor()
-    ctor.prototype.constructor = ctor
-  }
-}
-
-},{}],10:[function(require,module,exports){
 /*!
 * Determine if an object is a Buffer
 *
@ -3864,14 +3839,14 @@ function isSlowBuffer (obj) {
  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
 }

-},{}],11:[function(require,module,exports){
+},{}],10:[function(require,module,exports){
 var toString = {}.toString;

 module.exports = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
 };

-},{}],12:[function(require,module,exports){
+},{}],11:[function(require,module,exports){
 var Buffer = require('buffer').Buffer;

 module.exports = isBuffer;
@ -3881,7 +3856,7 @@ function isBuffer (o) {
    || /\[object (.+Array|Array.+)\]/.test(Object.prototype.toString.call(o));
 }

-},{"buffer":6}],13:[function(require,module,exports){
+},{"buffer":6}],12:[function(require,module,exports){
 (function (Buffer){
 module.exports = Level

@ -4059,7 +4034,7 @@ var checkKeyValue = Level.prototype._checkKeyValue = function (obj, type) {
 }

 }).call(this,require("buffer").Buffer)
-},{"./iterator":14,"abstract-leveldown":3,"buffer":6,"idb-wrapper":7,"isbuffer":12,"typedarray-to-buffer":33,"util":35,"xtend":37}],14:[function(require,module,exports){
+},{"./iterator":13,"abstract-leveldown":3,"buffer":6,"idb-wrapper":7,"isbuffer":11,"typedarray-to-buffer":32,"util":35,"xtend":37}],13:[function(require,module,exports){
 var util = require('util')
 var AbstractIterator  = require('abstract-leveldown').AbstractIterator
 var ltgt = require('ltgt')
@ -4133,7 +4108,7 @@ Iterator.prototype._next = function (callback) {
  this.callback = callback
 }

-},{"abstract-leveldown":3,"ltgt":15,"util":35}],15:[function(require,module,exports){
+},{"abstract-leveldown":3,"ltgt":14,"util":35}],14:[function(require,module,exports){
 (function (Buffer){

 exports.compare = function (a, b) {
@ -4181,28 +4156,28 @@ var lowerBoundKey = exports.lowerBoundKey = function (range) {
    )
 }

-var lowerBound = exports.lowerBound = function (range) {
+var lowerBound = exports.lowerBound = function (range, def) {
  var k = lowerBoundKey(range)
-  return k && range[k]
+  return k ? range[k] : def
 }

-exports.lowerBoundInclusive = function (range) {
+var lowerBoundInclusive = exports.lowerBoundInclusive = function (range) {
  return has(range, 'gt') ? false : true
 }

-exports.upperBoundInclusive =
+var upperBoundInclusive = exports.upperBoundInclusive =
  function (range) {
-    return has(range, 'lt') || !range.minEx ? false : true
+    return (has(range, 'lt') /*&& !range.maxEx*/) ? false : true
  }

 var lowerBoundExclusive = exports.lowerBoundExclusive =
  function (range) {
-    return has(range, 'gt') || range.minEx ? true : false
+    return !lowerBoundInclusive(range)
  }

 var upperBoundExclusive = exports.upperBoundExclusive =
  function (range) {
-    return has(range, 'lt') ? true : false
+    return !upperBoundInclusive(range)
  }

 var upperBoundKey = exports.upperBoundKey = function (range) {
@ -4215,9 +4190,30 @@ var upperBoundKey = exports.upperBoundKey = function (range) {
    )
 }

-var upperBound = exports.upperBound = function (range) {
+var upperBound = exports.upperBound = function (range, def) {
  var k = upperBoundKey(range)
-  return k && range[k]
+  return k ? range[k] : def
+}
+
+exports.start = function (range, def) {
+  return range.reverse ? upperBound(range, def) : lowerBound(range, def)
+}
+exports.end = function (range, def) {
+  return range.reverse ? lowerBound(range, def) : upperBound(range, def)
+}
+exports.startInclusive = function (range) {
+  return (
+    range.reverse
+  ? upperBoundInclusive(range)
+  : lowerBoundInclusive(range)
+  )
+}
+exports.endInclusive = function (range) {
+  return (
+    range.reverse
+  ? lowerBoundInclusive(range)
+  : upperBoundInclusive(range)
+  )
 }

 function id (e) { return e }
@ -4282,8 +4278,10 @@ exports.filter = function (range, compare) {
  }
 }

+
+
 }).call(this,{"isBuffer":require("../is-buffer/index.js")})
-},{"../is-buffer/index.js":10}],16:[function(require,module,exports){
+},{"../is-buffer/index.js":9}],15:[function(require,module,exports){
 var hasOwn = Object.prototype.hasOwnProperty;
 var toString = Object.prototype.toString;

@ -4325,11 +4323,11 @@ module.exports = function forEach(obj, fn) {
 };


-},{}],17:[function(require,module,exports){
+},{}],16:[function(require,module,exports){
 module.exports = Object.keys || require('./shim');


-},{"./shim":19}],18:[function(require,module,exports){
+},{"./shim":18}],17:[function(require,module,exports){
 var toString = Object.prototype.toString;

 module.exports = function isArguments(value) {
@ -4347,7 +4345,7 @@ module.exports = function isArguments(value) {
 };


-},{}],19:[function(require,module,exports){
+},{}],18:[function(require,module,exports){
 (function () {
 	"use strict";

@ -4411,7 +4409,7 @@ module.exports = function isArguments(value) {
 }());


-},{"./foreach":16,"./isArguments":18}],20:[function(require,module,exports){
+},{"./foreach":15,"./isArguments":17}],19:[function(require,module,exports){
 'use strict';


@ -4795,7 +4793,7 @@ function inflate(input, options) {
  inflator.push(input, true);

  // That will never happens, if you don't cheat with options :)
-  if (inflator.err) { throw inflator.msg; }
+  if (inflator.err) { throw inflator.msg || msg[inflator.err]; }

  return inflator.result;
 }
@ -4831,7 +4829,7 @@ exports.inflate = inflate;
 exports.inflateRaw = inflateRaw;
 exports.ungzip  = inflate;

-},{"./utils/common":21,"./utils/strings":22,"./zlib/constants":24,"./zlib/gzheader":26,"./zlib/inflate":28,"./zlib/messages":30,"./zlib/zstream":31}],21:[function(require,module,exports){
+},{"./utils/common":20,"./utils/strings":21,"./zlib/constants":23,"./zlib/gzheader":25,"./zlib/inflate":27,"./zlib/messages":29,"./zlib/zstream":30}],20:[function(require,module,exports){
 'use strict';


@ -4935,7 +4933,7 @@ exports.setTyped = function (on) {

 exports.setTyped(TYPED_OK);

-},{}],22:[function(require,module,exports){
+},{}],21:[function(require,module,exports){
 // String encode/decode helpers
 'use strict';

@ -5122,13 +5120,32 @@ exports.utf8border = function (buf, max) {
  return (pos + _utf8len[buf[pos]] > max) ? pos : max;
 };

-},{"./common":21}],23:[function(require,module,exports){
+},{"./common":20}],22:[function(require,module,exports){
 'use strict';

 // Note: adler32 takes 12% for level 0 and 2% for level 6.
 // It doesn't worth to make additional optimizationa as in original.
 // Small size is preferable.

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
 function adler32(adler, buf, len, pos) {
  var s1 = (adler & 0xffff) |0,
      s2 = ((adler >>> 16) & 0xffff) |0,
@ -5156,9 +5173,27 @@ function adler32(adler, buf, len, pos) {

 module.exports = adler32;

-},{}],24:[function(require,module,exports){
+},{}],23:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 module.exports = {

@ -5208,13 +5243,31 @@ module.exports = {
  //Z_NULL:                 null // Use -1 or null inline, depending on var type
 };

-},{}],25:[function(require,module,exports){
+},{}],24:[function(require,module,exports){
 'use strict';

 // Note: we can't get significant speed boost here.
 // So write code to minimize size - no pregenerated tables
 // and array tools dependencies.

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 // Use ordinary array, since untyped makes no boost here
 function makeTable() {
@ -5251,9 +5304,27 @@ function crc32(crc, buf, len, pos) {

 module.exports = crc32;

-},{}],26:[function(require,module,exports){
+},{}],25:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 function GZheader() {
  /* true if compressed data believed to be text */
@ -5293,9 +5364,28 @@ function GZheader() {

 module.exports = GZheader;

-},{}],27:[function(require,module,exports){
+},{}],26:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
 // See state defs from inflate.js
 var BAD = 30;       /* got a data error -- remain here until reset */
 var TYPE = 12;      /* i: waiting for type bits, including last-flag bit */
@ -5621,9 +5711,27 @@ module.exports = function inflate_fast(strm, start) {
  return;
 };

-},{}],28:[function(require,module,exports){
+},{}],27:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 var utils         = require('../utils/common');
 var adler32       = require('./adler32');
@ -7161,9 +7269,27 @@ exports.inflateSyncPoint = inflateSyncPoint;
 exports.inflateUndermine = inflateUndermine;
 */

-},{"../utils/common":21,"./adler32":23,"./crc32":25,"./inffast":27,"./inftrees":29}],29:[function(require,module,exports){
+},{"../utils/common":20,"./adler32":22,"./crc32":24,"./inffast":26,"./inftrees":28}],28:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 var utils = require('../utils/common');

@ -7391,10 +7517,8 @@ module.exports = function inflate_table(type, lens, lens_index, codes, table, ta
    return 1;
  }

-  var i = 0;
  /* process all codes and make table entries */
  for (;;) {
-    i++;
    /* create table entry */
    here_bits = len - drop;
    if (work[sym] < end) {
@ -7490,9 +7614,28 @@ module.exports = function inflate_table(type, lens, lens_index, codes, table, ta
  return 0;
 };

-},{"../utils/common":21}],30:[function(require,module,exports){
+},{"../utils/common":20}],29:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
 module.exports = {
  2:      'need dictionary',     /* Z_NEED_DICT       2  */
  1:      'stream end',          /* Z_STREAM_END      1  */
@ -7505,9 +7648,27 @@ module.exports = {
  '-6':   'incompatible version' /* Z_VERSION_ERROR (-6) */
 };

-},{}],31:[function(require,module,exports){
+},{}],30:[function(require,module,exports){
 'use strict';

+// (C) 1995-2013 Jean-loup Gailly and Mark Adler
+// (C) 2014-2017 Vitaly Puzrin and Andrey Tupitsin
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//   claim that you wrote the original software. If you use this software
+//   in a product, an acknowledgment in the product documentation would be
+//   appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//   misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.

 function ZStream() {
  /* next input byte */
@ -7536,7 +7697,7 @@ function ZStream() {

 module.exports = ZStream;

-},{}],32:[function(require,module,exports){
+},{}],31:[function(require,module,exports){
 // shim for using process in browser
 var process = module.exports = {};

@ -7707,6 +7868,10 @@ process.off = noop;
 process.removeListener = noop;
 process.removeAllListeners = noop;
 process.emit = noop;
+process.prependListener = noop;
+process.prependOnceListener = noop;
+
+process.listeners = function (name) { return [] }

 process.binding = function (name) {
    throw new Error('process.binding is not supported');
@ -7718,7 +7883,7 @@ process.chdir = function (dir) {
 };
 process.umask = function() { return 0; };

-},{}],33:[function(require,module,exports){
+},{}],32:[function(require,module,exports){
 (function (Buffer){
 /**
 * Convert a typed array to a Buffer without a copy
@ -7741,7 +7906,32 @@ module.exports = function (arr) {
 }

 }).call(this,require("buffer").Buffer)
-},{"buffer":6}],34:[function(require,module,exports){
+},{"buffer":6}],33:[function(require,module,exports){
+if (typeof Object.create === 'function') {
+  // implementation from standard node.js 'util' module
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    ctor.prototype = Object.create(superCtor.prototype, {
+      constructor: {
+        value: ctor,
+        enumerable: false,
+        writable: true,
+        configurable: true
+      }
+    });
+  };
+} else {
+  // old school shim for old browsers
+  module.exports = function inherits(ctor, superCtor) {
+    ctor.super_ = superCtor
+    var TempCtor = function () {}
+    TempCtor.prototype = superCtor.prototype
+    ctor.prototype = new TempCtor()
+    ctor.prototype.constructor = ctor
+  }
+}
+
+},{}],34:[function(require,module,exports){
 module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
@ -8338,7 +8528,7 @@ function hasOwnProperty(obj, prop) {
 }

 }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"./support/isBuffer":34,"_process":32,"inherits":9}],36:[function(require,module,exports){
+},{"./support/isBuffer":34,"_process":31,"inherits":33}],36:[function(require,module,exports){
 module.exports = hasKeys

 function hasKeys(source) {
@ -8374,7 +8564,7 @@ function extend() {
    return target
 }

-},{"./has-keys":36,"object-keys":17}],38:[function(require,module,exports){
+},{"./has-keys":36,"object-keys":16}],38:[function(require,module,exports){
 'use strict';

 var leveljs = require('level-js');
@ -8458,7 +8648,7 @@ function fetchLanguageData(req, res, cb) {
    xhr.send();
 }

-},{"../common/langdata.json":42,"level-js":13,"pako/lib/inflate.js":20}],39:[function(require,module,exports){
+},{"../common/langdata.json":42,"level-js":12,"pako/lib/inflate.js":19}],39:[function(require,module,exports){
 (function (process,global){
 'use strict';

@ -8489,7 +8679,7 @@ exports.getLanguageData = require('./lang.js');
 workerUtils.setAdapter(module.exports);

 }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
-},{"../common/worker.js":43,"./lang.js":38,"_process":32}],40:[function(require,module,exports){
+},{"../common/worker.js":43,"./lang.js":38,"_process":31}],40:[function(require,module,exports){
 'use strict';

 // This converts an image to grayscale
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@ -25,6 +25,7 @@
  },
  "dependencies": {
    "file-type": "^3.8.0",
+    "isomorphic-fetch": "^2.2.1",
    "is-url": "^1.2.2",
    "jpeg-js": "^0.2.0",
    "level-js": "^2.2.4",
@ -41,4 +42,4 @@
    "url": "https://github.com/naptha/tesseract.js/issues"
  },
  "homepage": "https://github.com/naptha/tesseract.js"
-}
+}
--- a/src/node/lang.js
+++ b/src/node/lang.js
@ -1,15 +1,22 @@
 const http = require("http"),
      zlib = require("zlib"),
      fs   = require("fs"),
-      path = require("path");
+      path = require("path"),
+      isURL = require("is-url");

 var langdata = require('../common/langdata.json')

 function getLanguageData(req, res, cb){
    var lang = req.options.lang,
        langfile = lang + '.traineddata.gz';
-
-    fs.readFile(lang + '.traineddata', function (err, data) {
+    
+    // langPath defaults to a URL where languages can be downloaded. If a custom path is specified
+    // and it is a local path, use that instead
+    var localPath = isURL(req.workerOptions.langPath) ? 
+        lang + '.traineddata' : 
+        path.join(req.workerOptions.langPath, lang + '.traineddata');
+
+    fs.readFile(localPath, function (err, data) {
        if(!err) return cb(new Uint8Array(data));

        http.get(req.workerOptions.langPath + langfile, stream => {
@ -34,4 +41,4 @@ function getLanguageData(req, res, cb){
 }


-module.exports = getLanguageData;
+module.exports = getLanguageData;