content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF 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 org.apache.cassandra.utils.memory;
  
  
  import java.nio.ByteBuffer;
  import java.nio.ByteOrder;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import org.apache.cassandra.utils.Architecture;
  
  public class BigEndianMemoryUtil extends MemoryUtil
  {
      public static int getUnsignedShort(long address)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b1) == 0L)
              return (Architecture.BIG_ENDIAN ? unsafe.getShort(address) : Short.reverseBytes(unsafe.getShort(address))) & 0xffff;
          else
              return getShortByByte(address) & 0xffff;
      }
  
      public static int getInt(long address)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b11) == 0L)
              return Architecture.BIG_ENDIAN ? unsafe.getInt(address) : Integer.reverseBytes(unsafe.getInt(address));
          else
              return getIntByByte(address);
      }
  
      public static long getLong(long address)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b111) == 0L)
              return Architecture.BIG_ENDIAN ? unsafe.getLong(address) : Long.reverseBytes(unsafe.getLong(address));
          else
              return getLongByByte(address);
      }
  
      public static void setShort(long address, short s)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b1) == 0L)
              unsafe.putShort(address, Architecture.BIG_ENDIAN ? s : Short.reverseBytes(s));
          else
              putShortByByte(address, s);
      }
  
      public static void setInt(long address, int l)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b11) == 0L)
              unsafe.putInt(address, Architecture.BIG_ENDIAN ? l : Integer.reverseBytes(l));
          else
              putIntByByte(address, l);
      }
  
      public static void setLong(long address, long l)
      {
          if (Architecture.IS_UNALIGNED || (address & 0b111) == 0L)
              unsafe.putLong(address, Architecture.BIG_ENDIAN ? l : Long.reverseBytes(l));
          else
              putLongByByte(address, l);
      }
  
      @VisibleForTesting
      static long getLongByByte(long address)
      {
          return  (((long) unsafe.getByte(address    )       ) << 56) |
                  (((long) unsafe.getByte(address + 1) & 0xff) << 48) |
                  (((long) unsafe.getByte(address + 2) & 0xff) << 40) |
                  (((long) unsafe.getByte(address + 3) & 0xff) << 32) |
                  (((long) unsafe.getByte(address + 4) & 0xff) << 24) |
                  (((long) unsafe.getByte(address + 5) & 0xff) << 16) |
                  (((long) unsafe.getByte(address + 6) & 0xff) <<  8) |
                  (((long) unsafe.getByte(address + 7) & 0xff)      );
      }
  
      @VisibleForTesting
      static int getIntByByte(long address)
      {
          return  (((int) unsafe.getByte(address    )       ) << 24) |
                  (((int) unsafe.getByte(address + 1) & 0xff) << 16) |
                  (((int) unsafe.getByte(address + 2) & 0xff) <<  8) |
                  (((int) unsafe.getByte(address + 3) & 0xff)      );
      }
  
      @VisibleForTesting
      static int getShortByByte(long address)
      {
          return  (((int) unsafe.getByte(address    )       ) << 8) |
                  (((int) unsafe.getByte(address + 1) & 0xff)     );
      }
  
      @VisibleForTesting
      static void putLongByByte(long address, long value)
      {
          unsafe.putByte(address    , (byte) (value >> 56));
          unsafe.putByte(address + 1, (byte) (value >> 48));
          unsafe.putByte(address + 2, (byte) (value >> 40));
          unsafe.putByte(address + 3, (byte) (value >> 32));
          unsafe.putByte(address + 4, (byte) (value >> 24));
          unsafe.putByte(address + 5, (byte) (value >> 16));
          unsafe.putByte(address + 6, (byte) (value >>  8));
          unsafe.putByte(address + 7, (byte) (value      ));
      }
  
      @VisibleForTesting
      static void putIntByByte(long address, int value)
      {
          unsafe.putByte(address    , (byte) (value >> 24));
          unsafe.putByte(address + 1, (byte) (value >> 16));
          unsafe.putByte(address + 2, (byte) (value >>  8));
          unsafe.putByte(address + 3, (byte) (value      ));
      }
  
      @VisibleForTesting
      static void putShortByByte(long address, short value)
      {
          unsafe.putByte(address    , (byte) (value >> 8));
          unsafe.putByte(address + 1, (byte) (value     ));
      }
  
      public static ByteBuffer getByteBuffer(long address, int length)
      {
          return getByteBuffer(address, length, ByteOrder.BIG_ENDIAN);
      }
  
      public static ByteBuffer getHollowDirectByteBuffer()
      {
          return getHollowDirectByteBuffer(ByteOrder.BIG_ENDIAN);
      }
  }
  