src/java.base/share/classes/sun/nio/cs/ArrayEncoder.java

@@ -24,12 +24,26 @@
  */
 
 package sun.nio.cs;
 
 /*
- * FastPath char[]->byte[] encoder, REPLACE on malformed input or
+ * FastPath char[]/byte[] -> byte[] encoder, REPLACE on malformed input or
  * unmappable input.
  */
 
 public interface ArrayEncoder {
+
+    //  is only used by j.u.zip.ZipCoder for utf8
     int encode(char[] src, int off, int len, byte[] dst);
+
+    default int encodeFromLatin1(byte[] src, int sp, int len, byte[] dst) {
+        return -1;
+    }
+
+    default int encodeFromUTF16(byte[] src, int sp, int len, byte[] dst) {
+        return -1;
+    }
+
+    default boolean isASCIICompatible() {
+        return false;
+    }
 }