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   /*
   * Copyright 2014 The Netty Project
   *
   * The Netty Project licenses this file to you 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 io.netty.buffer;
  
  import io.netty.util.internal.PlatformDependent;
  
  /**
   * Special {@link SwappedByteBuf} for {@link ByteBuf}s that are backed by a {@code memoryAddress}.
   */
  final class UnsafeDirectSwappedByteBuf extends AbstractUnsafeSwappedByteBuf {
  
      UnsafeDirectSwappedByteBuf(AbstractByteBuf buf) {
          super(buf);
      }
  
      private static long addr(AbstractByteBuf wrapped, int index) {
          // We need to call wrapped.memoryAddress() everytime and NOT cache it as it may change if the buffer expand.
          // See:
          // - https://github.com/netty/netty/issues/2587
          // - https://github.com/netty/netty/issues/2580
          return wrapped.memoryAddress() + index;
      }
  
      @Override
      protected long _getLong(AbstractByteBuf wrapped, int index) {
          return PlatformDependent.getLong(addr(wrapped, index));
      }
  
      @Override
      protected int _getInt(AbstractByteBuf wrapped, int index) {
          return PlatformDependent.getInt(addr(wrapped, index));
      }
  
      @Override
      protected short _getShort(AbstractByteBuf wrapped, int index) {
          return PlatformDependent.getShort(addr(wrapped, index));
      }
  
      @Override
      protected void _setShort(AbstractByteBuf wrapped, int index, short value) {
          PlatformDependent.putShort(addr(wrapped, index), value);
      }
  
      @Override
      protected void _setInt(AbstractByteBuf wrapped, int index, int value) {
          PlatformDependent.putInt(addr(wrapped, index), value);
      }
  
      @Override
      protected void _setLong(AbstractByteBuf wrapped, int index, long value) {
          PlatformDependent.putLong(addr(wrapped, index), value);
      }
  }