Add optional boolean parameter for setLittleEndian() and setBigEndian()

io/bytestream.js

@@ -71,14 +71,20 @@ export class ByteStream {
     return this.littleEndian_;
   }
 
-  /** Big-Endian is sometimes called Motorola-style. */
+  /**
-  setBigEndian() {
+   * Big-Endian is sometimes called Motorola-style.
-    this.littleEndian_ = false;
+   * @param {boolean=} The value to set. If not present, the stream is set to big-endian.
+   */
+  setBigEndian(val = true) {
+    this.littleEndian_ = !val;
   }
 
-  /** Little-Endian is sometimes called Intel-style. */
+  /**
-  setLittleEndian() {
+   * Little-Endian is sometimes called Intel-style.
-    this.littleEndian_ = true;
+   * @param {boolean=} The value to set. If not present, the stream to little-endian.
+   */
+  setLittleEndian(val = true) {
+    this.littleEndian_ = val;
   }
 
   /**

tests/io-bytestream.spec.js

@@ -78,9 +78,23 @@ describe('bitjs.io.ByteStream', () => {
     // Stream now has 0, 1, 0, 1.
     const stream = new ByteStream(array.buffer);
     stream.setBigEndian();
-    expect(stream.readNumber(2)).equals(1);
+    expect(stream.peekNumber(2)).equals(1);
+    stream.setBigEndian(false);
+    expect(stream.peekNumber(2)).equals(256);
+    stream.setBigEndian(true);
+    expect(stream.peekNumber(2)).equals(1);
+
+    stream.skip(2);
+
     stream.setLittleEndian();
-    expect(stream.readNumber(2)).equals(256);
+    expect(stream.peekNumber(2)).equals(256);
+    stream.setLittleEndian(false);
+    expect(stream.peekNumber(2)).equals(1);
+    stream.setLittleEndian(true);
+    expect(stream.peekNumber(2)).equals(256);
+
+    stream.skip(2);
+
     expect(() => stream.readNumber(1)).to.throw();
   });