/*
 * 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.hadoop.ozone.client.checksum;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.fs.FileChecksum;
import org.apache.hadoop.fs.Options.ChecksumOpt;
import org.apache.hadoop.hdds.annotation.InterfaceAudience;
import org.apache.hadoop.hdds.annotation.InterfaceStability;
import org.apache.hadoop.util.DataChecksum;

/** Composite CRC. */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class CompositeCrcFileChecksum extends FileChecksum {
  public static final int LENGTH = Integer.SIZE / Byte.SIZE;

  private int crc;
  private DataChecksum.Type crcType;
  private int bytesPerCrc;

  /**
   * Create a CompositeCrcFileChecksum.
   *
   * @param crc crc.
   * @param crcType crcType.
   * @param bytesPerCrc bytesPerCrc.
   */
  public CompositeCrcFileChecksum(
      int crc, DataChecksum.Type crcType, int bytesPerCrc) {
    this.crc = crc;
    this.crcType = crcType;
    this.bytesPerCrc = bytesPerCrc;
  }

  @Override
  public String getAlgorithmName() {
    return "COMPOSITE-" + crcType.name();
  }

  @Override
  public int getLength() {
    return LENGTH;
  }

  @Override
  public byte[] getBytes() {
    return CrcUtil.intToBytes(crc);
  }

  @Override
  public ChecksumOpt getChecksumOpt() {
    return new ChecksumOpt(crcType, bytesPerCrc);
  }

  @Override
  public void readFields(DataInput in) throws IOException {
    crc = in.readInt();
  }

  @Override
  public void write(DataOutput out) throws IOException {
    out.writeInt(crc);
  }

  @Override
  public String toString() {
    return getAlgorithmName() + ":" + String.format("0x%08x", crc);
  }
}
