content: /*
   * Copyright 2020 Alibaba Group Holding Limited.
   *
   * 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.alibaba.graphscope.common.jna.type;
  
  import com.alibaba.graphscope.common.jna.IrCoreLibrary;
  import com.alibaba.graphscope.common.jna.IrTypeMapper;
  import com.sun.jna.Pointer;
  import com.sun.jna.Structure;
  
  import java.io.Closeable;
  
  @Structure.FieldOrder({"buffer", "len", "error"})
  public class FfiData extends Structure {
      public FfiData() {
          super(IrTypeMapper.INSTANCE);
      }
  
      public static class ByValue extends FfiData implements Structure.ByValue, Closeable {
          public byte[] getBytes() {
              if (buffer != null && len > 0) {
                  byte[] bytes = buffer.getByteArray(0, len);
                  return bytes;
              }
              return null;
          }
  
          @Override
          public void close() {
              setAutoSynch(false);
              IrCoreLibrary.INSTANCE.destroyFfiData(this);
          }
      }
  
      public Pointer buffer;
      public int len;
      public FfiResult.ByValue error;
  }
  