[lib/util] Use DataWriters.write_range internally in DataWriter itself

lib/util/DataWriter.v3

@@ -32,21 +32,17 @@ class DataWriter {
 	// Write a 16-bit little-endian integer.
 	def put_b16(data: int) -> this {
 		var a = acquire(2);
-		a[0] = byte.view(data);
-		a[1] = byte.view(data >> 8);
+		DataWriters.write_range_i16(a, i16.view(data));
 	}
 	// Write a 32-bit little-endian integer.
 	def put_b32(data: int) -> this {
 		var a = acquire(4);
-		a[0] = byte.view(data);
-		a[1] = byte.view(data >> 8);
-		a[2] = byte.view(data >> 16);
-		a[3] = byte.view(data >> 24);
+		DataWriters.write_range_i32(a, data);
 	}
 	// Write a 64-bit little-endian integer.
 	def put_b64(data: long) -> this {
-		put_b32(int.view(data));
-		put_b32(int.view(data >> 32));
+		var a = acquire(8);
+		DataWriters.write_range_i64(a, data);
 	}
 	// Write a 16-bit big-endian integer.
 	def put_b16be(data: int) -> this {