From 01b47d9012b15c857f423dcbf2f7238f341c1985 Mon Sep 17 00:00:00 2001
From: Yury Delendik <ydelendik@mozilla.com>
Date: Fri, 28 Jul 2017 11:35:06 -0500
Subject: [PATCH] Use streams-lib as polyfill

---
 gulpfile.js                    |  2 +-
 src/shared/streams_polyfill.js | 24 ++++++++++++++++++++++++
 src/shared/util.js             |  2 +-
 3 files changed, 26 insertions(+), 2 deletions(-)
 create mode 100644 src/shared/streams_polyfill.js

diff --git a/gulpfile.js b/gulpfile.js
index 0408d07c1..e2fb2e862 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1040,7 +1040,7 @@ gulp.task('lib', ['buildnumber'], function () {
   var buildLib = merge([
     gulp.src([
       'src/{core,display}/*.js',
-      'src/shared/{compatibility,util}.js',
+      'src/shared/{compatibility,util,streams_polyfill}.js',
       'src/{pdf,pdf.worker}.js',
     ], { base: 'src/', }),
     gulp.src([
diff --git a/src/shared/streams_polyfill.js b/src/shared/streams_polyfill.js
new file mode 100644
index 000000000..5e3ce9050
--- /dev/null
+++ b/src/shared/streams_polyfill.js
@@ -0,0 +1,24 @@
+/* Copyright 2017 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+if (typeof ReadableStream !== 'undefined') {
+  exports.ReadableStream = ReadableStream;
+} else {
+  if (typeof PDFJSDev !== 'undefined' && PDFJSDev.test('CHROME')) {
+    throw new Error('ReadableStream polyfill is not found for Chrome bundle');
+  }
+  exports.ReadableStream =
+    require('../../external/streams/streams-lib').ReadableStream;
+}
diff --git a/src/shared/util.js b/src/shared/util.js
index 343567058..26ac9ba6d 100644
--- a/src/shared/util.js
+++ b/src/shared/util.js
@@ -14,7 +14,7 @@
  */
 
 import './compatibility';
-import { ReadableStream } from '../../external/streams/streams-lib';
+import { ReadableStream } from './streams_polyfill';
 
 var globalScope =
   (typeof window !== 'undefined' && window.Math === Math) ? window :