Package com.webcodepro.applecommander.storage.physical

Class NibbleOrder

java.lang.Object

com.webcodepro.applecommander.storage.physical.ImageOrder

com.webcodepro.applecommander.storage.physical.DosOrder

com.webcodepro.applecommander.storage.physical.NibbleOrder

public class NibbleOrder
extends DosOrder

Supports disk images stored in nibbilized DOS physical order.

Field Summary

Fields

Modifier and Type	Field	Description
static final int[]	DOS_SECTOR_SKEW	This maps a DOS 3.3 sector to a physical sector.

Constructor Summary

Constructors

Constructor	Description
NibbleOrder(ByteArrayImageLayout diskImageManager)	Construct a NibbleOrder.

Method Summary

Modifier and Type	Method	Description
void	format()	Format the media.
int	getBlocksOnDevice()	Answer with the number of blocks on this device.
int	getSectorsPerTrack()	Answer with the number of sectors per track on this device.
int	getTracksPerDisk()	Answer with the number of tracks on this device.
byte[]	readSector(int track, int dosSector)	Retrieve the specified sector.
protected byte[]	readTrackData(int track)	Read nibbilized track data.
void	writeSector(int track, int dosSector, byte[] sectorData)	Write the specified sector.
protected void	writeTrackData(int track, byte[] trackData)	Write nibbilized track data.

Methods inherited from class com.webcodepro.applecommander.storage.physical.DosOrder

blockToSectors525, getName, getOffset, isBlockDevice, isTrackAndSectorDevice, readBlock, writeBlock

Methods inherited from class com.webcodepro.applecommander.storage.physical.ImageOrder

getDiskImageManager, getPhysicalSize, getSectorsPerDisk, isSizeApprox, readBytes, setDiskImageManager, writeBytes

Methods inherited from class java.lang.Object

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

Field Details

DOS_SECTOR_SKEW

public static final int[] DOS_SECTOR_SKEW

This maps a DOS 3.3 sector to a physical sector. (readSector and writeSector work off of the DOS 3.3 sector numbering.)

Constructor Details

NibbleOrder

public NibbleOrder(ByteArrayImageLayout diskImageManager)

Construct a NibbleOrder.

Method Details

readTrackData

protected byte[] readTrackData(int track)

Read nibbilized track data.

writeTrackData

protected void writeTrackData(int track,
 byte[] trackData)

Write nibbilized track data.

readSector

public byte[] readSector(int track,
 int dosSector)
                  throws IllegalArgumentException

Retrieve the specified sector. The primary source of information for this process is directly from Beneath Apple DOS, chapter 3.

Overrides:

readSector in class DosOrder

Throws:

IllegalArgumentException

writeSector

public void writeSector(int track,
 int dosSector,
 byte[] sectorData)
                 throws IllegalArgumentException

Write the specified sector.

Overrides:

writeSector in class DosOrder

Throws:

IllegalArgumentException

getTracksPerDisk

public int getTracksPerDisk()

Answer with the number of tracks on this device.

Overrides:

getTracksPerDisk in class ImageOrder

getSectorsPerTrack

public int getSectorsPerTrack()

Answer with the number of sectors per track on this device.

Overrides:

getSectorsPerTrack in class ImageOrder

getBlocksOnDevice

public int getBlocksOnDevice()

Answer with the number of blocks on this device. This cannot be computed since the physical size relates to disk bytes (6+2 encoded) instead of a full 8-bit byte.

Overrides:

getBlocksOnDevice in class ImageOrder

format

public void format()

Format the media. Formatting at the ImageOrder level deals with low-level issues. A typical ordering just needs to have the image "wiped," and that is the assumed implementation. However, specialized orders - such as a nibbilized disk - need to lay down track and sector markers.

Overrides:

format in class ImageOrder