66 lines
2.0 KiB
Java
66 lines
2.0 KiB
Java
package com.bytezone.diskbrowser.nib;
|
|
|
|
// -----------------------------------------------------------------------------------//
|
|
abstract class DiskReader
|
|
// -----------------------------------------------------------------------------------//
|
|
{
|
|
static final int BLOCK_SIZE = 256;
|
|
static final byte[] dataPrologue = { (byte) 0xD5, (byte) 0xAA, (byte) 0xAD };
|
|
|
|
static DiskReader reader13;
|
|
static DiskReader reader16;
|
|
static DiskReader readerGRC;
|
|
|
|
final int sectorsPerTrack;
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
DiskReader (int sectorsPerTrack)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
this.sectorsPerTrack = sectorsPerTrack;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
static DiskReader getInstance (int sectors)
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
switch (sectors)
|
|
{
|
|
case 13:
|
|
if (reader13 == null)
|
|
reader13 = new DiskReader13Sector ();
|
|
return reader13;
|
|
|
|
case 16:
|
|
if (reader16 == null)
|
|
reader16 = new DiskReader16Sector ();
|
|
return reader16;
|
|
|
|
case 0:
|
|
if (readerGRC == null)
|
|
readerGRC = new DiskReaderGRC ();
|
|
return readerGRC;
|
|
|
|
default:
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
byte[] decodeSector (byte[] buffer) throws DiskNibbleException
|
|
// ---------------------------------------------------------------------------------//
|
|
{
|
|
return decodeSector (buffer, 0);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------------//
|
|
// abstract functions
|
|
// ---------------------------------------------------------------------------------//
|
|
|
|
abstract byte[] decodeSector (byte[] buffer, int offset) throws DiskNibbleException;
|
|
|
|
abstract byte[] encodeSector (byte[] buffer);
|
|
|
|
abstract int expectedDataSize ();
|
|
}
|