text: /*
   * Copyright DataStax, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.datastax.dse.driver.internal.core.graph;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import java.nio.ByteBuffer;
  
  public class ByteBufUtil {
  
    // Does not move the reader index of the ByteBuf parameter
    public static ByteBuffer toByteBuffer(ByteBuf buffer) {
      if (buffer.isDirect()) {
        return buffer.nioBuffer();
      }
      final byte[] bytes = new byte[buffer.readableBytes()];
      buffer.getBytes(buffer.readerIndex(), bytes);
      return ByteBuffer.wrap(bytes);
    }
  
    static ByteBuf toByteBuf(ByteBuffer buffer) {
      return Unpooled.wrappedBuffer(buffer);
    }
  
    // read a predefined amount of bytes from the netty buffer and move its readerIndex
    public static ByteBuffer readBytes(ByteBuf nettyBuf, int size) {
      ByteBuffer res = ByteBuffer.allocate(size);
      nettyBuf.readBytes(res);
      res.flip();
      return res;
    }
  }
  