org.jscsi.target.scsi.cdb

Class ReadOrWriteCdb

java.lang.Object

org.jscsi.target.scsi.cdb.CommandDescriptorBlock

org.jscsi.target.scsi.cdb.ReadOrWriteCdb

Direct Known Subclasses:

ReadCdb, WriteCdb

public abstract class ReadOrWriteCdb
extends CommandDescriptorBlock

This abstract class represents Command Descriptor Blocks for the READ and WRITE SCSI commands. This grouping makes sense, since, apart from the different values of the OPERATION CODE field, Read and Write CDBs are identical.

Author:

Andreas Ergenzinger

Constructor Summary

Constructors

Constructor and Description
ReadOrWriteCdb(ByteBuffer buffer)

Method Summary

Methods

Modifier and Type	Method and Description
void	addIllegalFieldPointerForLogicalBlockAddress() This method is used for signaling an illegal value of the logicalBlockAddress variable.
void	addIllegalFieldPointerForTransferLength() This method is used for signaling an illegal value of the transferLength variable.
protected abstract long	deserializeLogicalBlockAddress(ByteBuffer buffer) Deserializes the value of the logicalBlockAddress field.
protected abstract int	deserializeTransferLength(ByteBuffer buffer) Deserializes the value of the transferLength field.
long	getLogicalBlockAddress() Returns the value of logicalBlockAddress.
protected abstract int	getLogicalBlockAddressFieldIndex() Returns the index position of the first byte used for encoding the logicalBlockAddress field.
int	getTransferLength() Returns the value of transferLength.
protected abstract int	getTransferLengthFieldIndex() Returns the index position of the first byte used for encoding the transferLength field.

Methods inherited from class org.jscsi.target.scsi.cdb.CommandDescriptorBlock

addIllegalFieldPointer, addIllegalFieldPointer, getIllegalFieldPointers, getScsiOperationCode, isNormalACA

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReadOrWriteCdb

public ReadOrWriteCdb(ByteBuffer buffer)

Method Detail

deserializeLogicalBlockAddress

protected abstract long deserializeLogicalBlockAddress(ByteBuffer buffer)

Deserializes the value of the logicalBlockAddress field.

Parameters:

buffer - the ByteBuffer containing the CDB

Returns:

value of the logicalBlockAddress field

deserializeTransferLength

protected abstract int deserializeTransferLength(ByteBuffer buffer)

Deserializes the value of the transferLength field.

Parameters:

buffer - the ByteBuffer containing the CDB

Returns:

value of the transferLength field

getLogicalBlockAddress

public final long getLogicalBlockAddress()

Returns the value of logicalBlockAddress.

Returns:

the value of logicalBlockAddress

getTransferLength

public final int getTransferLength()

Returns the value of transferLength.

Returns:

the value of transferLength

getLogicalBlockAddressFieldIndex

protected abstract int getLogicalBlockAddressFieldIndex()

Returns the index position of the first byte used for encoding the logicalBlockAddress field.

Returns:

the index position of the first byte used for encoding the logicalBlockAddress field

getTransferLengthFieldIndex

protected abstract int getTransferLengthFieldIndex()

Returns the index position of the first byte used for encoding the transferLength field.

Returns:

the index position of the first byte used for encoding the transferLength field

addIllegalFieldPointerForLogicalBlockAddress

public final void addIllegalFieldPointerForLogicalBlockAddress()

This method is used for signaling an illegal value of the logicalBlockAddress variable.

This method must be called if the logicalBlockAddress lies outside the bounds of the used medium.

See Also:

CommandDescriptorBlock.getIllegalFieldPointers(), IStorageModule.checkBounds(long, int)

addIllegalFieldPointerForTransferLength

public final void addIllegalFieldPointerForTransferLength()

This method is used for signaling an illegal value of the transferLength variable.

This method must be called if the transferLength field value would result in accessing of out-of-bounds blocks of the storage medium.

See Also:

CommandDescriptorBlock.getIllegalFieldPointers(), IStorageModule.checkBounds(long, int)