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.carbondata.core.datastore.compression;
  
  import java.nio.ByteBuffer;
  
  import com.github.luben.zstd.Zstd;
  
  public class ZstdCompressor extends AbstractCompressor {
    private static final int COMPRESS_LEVEL = 3;
  
    public ZstdCompressor() {
    }
  
    @Override
    public String getName() {
      return "zstd";
    }
  
    @Override
    public ByteBuffer compressByte(ByteBuffer compInput) {
      compInput.flip();
      if (compInput.isDirect()) {
        return Zstd.compress(compInput, COMPRESS_LEVEL);
      } else {
        return ByteBuffer.wrap(Zstd.compress(compInput.array(), COMPRESS_LEVEL));
      }
    }
  
    @Override
    public ByteBuffer compressByte(byte[] unCompInput) {
      return ByteBuffer.wrap(Zstd.compress(unCompInput, COMPRESS_LEVEL));
    }
  
    @Override
    public byte[] compressByte(byte[] unCompInput, int byteSize) {
      return Zstd.compress(unCompInput, COMPRESS_LEVEL);
    }
  
    @Override
    public byte[] unCompressByte(byte[] compInput) {
      long decompressedSize = Zstd.decompressedSize(compInput);
      return Zstd.decompress(compInput, (int) decompressedSize);
    }
  
    @Override
    public byte[] unCompressByte(byte[] compInput, int offset, int length) {
      // todo: how to avoid memory copy
      byte[] dstBytes = new byte[length];
      System.arraycopy(compInput, offset, dstBytes, 0, length);
      return unCompressByte(dstBytes);
    }
  
    @Override
    public long rawUncompress(byte[] input, byte[] output) {
      return Zstd.decompress(output, input);
    }
  
    @Override
    public long maxCompressedLength(long inputSize) {
      return Zstd.compressBound(inputSize);
    }
  
    /**
     * currently java version of zstd does not support this feature.
     * It may support it in upcoming release 1.3.5-3, then we can optimize this accordingly.
     */
    @Override
    public int unCompressedLength(byte[] data, int offset, int length) {
      throw new RuntimeException("Unsupported operation Exception");
    }
  
    @Override
    public int rawUncompress(byte[] data, int offset, int length, byte[] output) {
      throw new RuntimeException("Unsupported operation Exception");
    }
  }
  