Fix Output.longLength to accept long instead of int

src/com/esotericsoftware/kryo/io/Output.java

@@ -474,7 +474,7 @@ public void writeLong (long value) throws KryoException {
 	 * {@link #writeVarLong(long, boolean)} explicitly when writing values that should always use variable length encoding (eg
 	 * values that appear many times).
 	 * @return The number of bytes written.
-	 * @see #longLength(int, boolean) */
+	 * @see #longLength(long, boolean) */
 	public int writeLong (long value, boolean optimizePositive) throws KryoException {
 		if (varEncoding) return writeVarLong(value, optimizePositive);
 		writeLong(value);
@@ -594,7 +594,7 @@ public int writeVarLong (long value, boolean optimizePositive) throws KryoExcept
 	}
 
 	/** Returns the number of bytes that would be written with {@link #writeLong(long, boolean)}. */
-	public int longLength (int value, boolean optimizePositive) {
+	public int longLength (long value, boolean optimizePositive) {
 		if (varEncoding) return varLongLength(value, optimizePositive);
 		return 8;
 	}

test/com/esotericsoftware/kryo/io/InputOutputTest.java

@@ -51,6 +51,22 @@ void testByteBufferInputEnd () {
 		assertTrue(in.end());
 	}
 
+	@Test
+	void testLongLength () {
+		// Values spanning each var-long byte boundary, including values outside int range and negatives.
+		long[] values = {0L, 127L, 128L, 1L << 28, 1L << 32, 1L << 40, 1L << 48, 1L << 56, Long.MAX_VALUE, -1L,
+			Long.MIN_VALUE};
+		for (boolean optimizePositive : new boolean[] {true, false}) {
+			for (long value : values) {
+				Output output = new Output(16);
+				int written = output.writeVarLong(value, optimizePositive);
+				assertEquals(written, output.longLength(value, optimizePositive),
+					"value=" + value + " optimizePositive=" + optimizePositive);
+				assertEquals(written, Output.varLongLength(value, optimizePositive));
+			}
+		}
+	}
+
 	@Test
 	void testOutputStream () throws IOException {
 		ByteArrayOutputStream buffer = new ByteArrayOutputStream();