Implement j.l.Byte.toUnsigned{Int,Long}

Author: armanbilge

javalanglib/src/main/scala/java/lang/Byte.scala

@@ -96,4 +96,10 @@ object Byte {
 
   @inline def compare(x: scala.Byte, y: scala.Byte): scala.Int =
     x - y
+
+  @inline def toUnsignedInt(x: scala.Byte): scala.Int =
+    x.toInt & 0xff
+
+  @inline def toUnsignedLong(x: scala.Byte): scala.Long =
+    toUnsignedInt(x).toLong
 }

test-suite/shared/src/test/scala/org/scalajs/testsuite/javalib/lang/ByteTest.scala

@@ -43,6 +43,22 @@ class ByteTest {
     assertEquals(0, compare(3.toByte, 3.toByte))
   }
 
+  @Test def toUnsignedInt(): Unit = {
+    assertEquals(0, JByte.toUnsignedInt(0.toByte))
+    assertEquals(42, JByte.toUnsignedInt(42.toByte))
+    assertEquals(214, JByte.toUnsignedInt(-42.toByte))
+    assertEquals(128, JByte.toUnsignedInt(Byte.MinValue))
+    assertEquals(127, JByte.toUnsignedInt(Byte.MaxValue))
+  }
+
+  @Test def toUnsignedLong(): Unit = {
+    assertEquals(0L, JByte.toUnsignedLong(0.toByte))
+    assertEquals(42L, JByte.toUnsignedLong(42.toByte))
+    assertEquals(214L, JByte.toUnsignedLong(-42.toByte))
+    assertEquals(128L, JByte.toUnsignedLong(Byte.MinValue))
+    assertEquals(127L, JByte.toUnsignedLong(Byte.MaxValue))
+  }
+
   @Test def parseString(): Unit = {
     def test(s: String, v: Byte): Unit = {
       assertEquals(v, JByte.parseByte(s))