Optimize derived buffers' forEachByte(...) implementation

- Related: #1378

buffer/src/main/java/io/netty/buffer/DuplicatedByteBuf.java

@@ -291,5 +291,10 @@ public class DuplicatedByteBuf extends AbstractDerivedByteBuf {
     public ByteBuffer internalNioBuffer(int index, int length) {
         return buffer.internalNioBuffer(index, length);
     }
+
+    @Override
+    public int forEachByte(int fromIndex, int toIndex, ByteBufProcessor processor) {
+        return buffer.forEachByte(fromIndex, toIndex, processor);
+    }
 }
 

buffer/src/main/java/io/netty/buffer/ReadOnlyByteBuf.java

@@ -295,6 +295,11 @@ public class ReadOnlyByteBuf extends AbstractDerivedByteBuf {
         return buffer.internalNioBuffer(index, length);
     }
 
+    @Override
+    public int forEachByte(int fromIndex, int toIndex, ByteBufProcessor processor) {
+        return buffer.forEachByte(fromIndex, toIndex, processor);
+    }
+
     @Override
     public int capacity() {
         return buffer.capacity();

buffer/src/main/java/io/netty/buffer/SlicedByteBuf.java

@@ -273,4 +273,9 @@ public class SlicedByteBuf extends AbstractDerivedByteBuf {
         checkIndex(index, length);
         return buffer.internalNioBuffer(index + adjustment, length);
     }
+
+    @Override
+    public int forEachByte(int fromIndex, int toIndex, ByteBufProcessor processor) {
+        return buffer.forEachByte(fromIndex + adjustment, toIndex + adjustment, processor);
+    }
 }