package org.jscsi.target.connection.stage.fullfeature;
   
   
   import org.jscsi.target.connection.phase.TargetFullFeaturePhase;
   import org.jscsi.target.scsi.cdb.CommandDescriptorBlock;
   import org.jscsi.target.scsi.cdb.ReadOrWriteCdb;
   import org.jscsi.target.scsi.sense.senseDataDescriptor.senseKeySpecific.FieldPointerSenseKeySpecificData;
   
   
  /**
   * This is an abstract superclass for stages that handle PDUs with command descriptor blocks of the
   * {@link ReadOrWriteCdb} class.
   * 
   * @author Andreas Ergenzinger
   */
  public abstract class ReadOrWriteStage extends TargetFullFeatureStage {
  
      public ReadOrWriteStage (TargetFullFeaturePhase targetFullFeaturePhase) {
          super(targetFullFeaturePhase);
      }
  
      /**
       * Checks if the <code>LOGICAL BLOCK ADDRESS</code> and <code>TRANSFER
       * LENGTH</code> fields in the passed {@link ReadOrWriteCdb} are acceptable. If illegal values are detected, an
       * instance of {@link FieldPointerSenseKeySpecificData} describing the problem will be added to the
       * {@link ReadOrWriteCdb}'s queue-
       * 
       * @param cdb a read or write command descriptor block to check
       * @see CommandDescriptorBlock#getIllegalFieldPointers()
       */
      protected void checkOverAndUnderflow (final ReadOrWriteCdb cdb) {
          // check if requested blocks are out of bounds
          final int boundsCheck = session.getStorageModule().checkBounds(cdb.getLogicalBlockAddress(), cdb.getTransferLength());
          // add illegal field pointer, or not
          if (boundsCheck == 1)
              cdb.addIllegalFieldPointerForLogicalBlockAddress();
          else if (boundsCheck == 2) cdb.addIllegalFieldPointerForTransferLength();
      }
  
  }