Android Open Source - libaums Scsi Read10

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * (C) Copyright 2014 mjahnen <jahnen@in.tum.de>
 *//from  www .j a  v a2  s.  c om
 * 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.github.mjdev.libaums.driver.scsi.commands;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

/**
 * SCSI command to read from the mass storage device. The 10 means that the
 * transfer length is two byte and the logical block address field is four byte.
 * Thus the hole command takes 10 byte when serialized.
 * <p>
 * The actual data is transferred in the data phase.
 * 
 * @author mjahnen
 * 
 */
public class ScsiRead10 extends CommandBlockWrapper {

  // private static final String TAG = ScsiRead10.class.getSimpleName();
  private static final byte LENGTH = 0x10;
  private static final byte OPCODE = 0x28;

  private int blockAddress;
  private int transferBytes;
  private int blockSize;
  private short transferBlocks;

  /**
   * Constructs a new read command with the given information.
   * 
   * @param blockAddress
   *            The logical block address the read should start.
   * @param transferBytes
   *            The bytes which should be transferred.
   * @param blockSize
   *            The block size of the mass storage device.
   */
  public ScsiRead10(int blockAddress, int transferBytes, int blockSize) {
    super(transferBytes, Direction.IN, (byte) 0, LENGTH);
    this.blockAddress = blockAddress;
    this.transferBytes = transferBytes;
    this.blockSize = blockSize;
    short transferBlocks = (short) (transferBytes / blockSize);
    if (transferBytes % blockSize != 0) {
      throw new IllegalArgumentException("transfer bytes is not a multiple of block size");
    }
    this.transferBlocks = transferBlocks;
  }

  @Override
  public void serialize(ByteBuffer buffer) {
    super.serialize(buffer);
    buffer.order(ByteOrder.BIG_ENDIAN);
    buffer.put(OPCODE);
    buffer.put((byte) 0);
    buffer.putInt(blockAddress);
    buffer.put((byte) 0);
    buffer.putShort(transferBlocks);
  }

  @Override
  public String toString() {
    return "ScsiRead10 [blockAddress=" + blockAddress + ", transferBytes=" + transferBytes
        + ", blockSize=" + blockSize + ", transferBlocks=" + transferBlocks
        + ", getdCbwDataTransferLength()=" + getdCbwDataTransferLength() + "]";
  }

}

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