package org.jscsi.target.scsi.cdb;

 import java.nio.ByteBuffer;

 import org.jscsi.target.util.BitManip;

 /**

  * This class represents Command Descriptor Blocks for the <code>REQUEST SENSE</code> SCSI command, which requests that

  * the device server transfers sense data to the application client.

  * 

  * @author Andreas Ergenzinger

  */

 public final class RequestSenseCdb extends CommandDescriptorBlock {

     /**

      * The descriptor format (DESC) bit specifies which sense data format shall be returned. If DESC is set to zero,

      * fixed format sense data shall be returned. If DESC is set to one and descriptor format sense data is supported,

      * descriptor format sense data shall be returned.

      */

     private final boolean descriptorFormat;

     /**

      * The ALLOCATION LENGTH field specifies the maximum number of bytes that an application client has allocated in the

      * Data-In Buffer.

      */

     private final int allocationLength;

     public RequestSenseCdb (ByteBuffer buffer) {

         super(buffer);

         // descriptor format

         descriptorFormat = BitManip.getBit(buffer.get(1), 0);

         // allocation length

         allocationLength = buffer.get(4) & 255;

     }

     public final boolean getDescriptorFormat () {

         return descriptorFormat;

     }

     public final int getAllocationLength () {

         return allocationLength;

     }

 }