Apple-2-Tools/dmolony-DiskBrowser
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Denis Molony 2015-12-18 10:00:00 +11:00
parent 2b17dd3b15
commit e135cf75a6
1 changed files with 23 additions and 25 deletions
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48
src/com/bytezone/diskbrowser/disk/AppleDisk.java
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@ -23,21 +23,21 @@ public class AppleDisk implements Disk
static final int MAX_INTERLEAVE = 3; static final int MAX_INTERLEAVE = 3;
public final File path; public final File path;
private final byte[] diskBuffer; // contains the disk contents in memory private final byte[] diskBuffer; // contains the disk contents in memory
private final int tracks; // usually 35 for floppy disks private final int tracks; // usually 35 for floppy disks
private int sectors; // 8 or 16 private int sectors; // 8 or 16
private int blocks; // 280 or 560 private int blocks; // 280 or 560
private final int trackSize; // 4096 private final int trackSize; // 4096
public int sectorSize; // 256 or 512 public int sectorSize; // 256 or 512
private int interleave = 0; private int interleave = 0;
private static int[][] interleaveSector = // private static int[][] interleaveSector = //
{ { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, // Dos { { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, // Dos
{ 0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15 }, // Prodos { 0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15 }, // Prodos
{ 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 15 }, // Infocom { 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 15 }, // Infocom
{ 0, 6, 12, 3, 9, 15, 14, 5, 11, 2, 8, 7, 13, 4, 10, 1 } }; // CPM { 0, 6, 12, 3, 9, 15, 14, 5, 11, 2, 8, 7, 13, 4, 10, 1 } }; // CPM
private boolean[] hasData; private boolean[] hasData;
private ActionListener actionListenerList; private ActionListener actionListenerList;
@ -57,7 +57,7 @@ public class AppleDisk implements Disk
if (pos > 0 && name.substring (pos + 1).equalsIgnoreCase ("2mg")) if (pos > 0 && name.substring (pos + 1).equalsIgnoreCase ("2mg"))
{ {
byte[] buffer = getPrefix (path); byte[] buffer = getPrefix (path);
this.blocks = HexFormatter.intValue (buffer[20], buffer[21]); // 1600 this.blocks = HexFormatter.intValue (buffer[20], buffer[21]); // 1600
this.sectorSize = 512; this.sectorSize = 512;
this.trackSize = 8 * sectorSize; this.trackSize = 8 * sectorSize;
tracks = this.blocks / 8; tracks = this.blocks / 8;
@ -66,7 +66,7 @@ public class AppleDisk implements Disk
} }
else if (pos > 0 && name.substring (pos + 1).equalsIgnoreCase ("HDV")) else if (pos > 0 && name.substring (pos + 1).equalsIgnoreCase ("HDV"))
{ {
this.blocks = (int) path.length () / 4096 * 8; // reduces blocks to a legal multiple this.blocks = (int) path.length () / 4096 * 8; // reduces blocks to a legal multiple
this.sectorSize = 512; this.sectorSize = 512;
this.trackSize = sectors * sectorSize; this.trackSize = sectors * sectorSize;
} }
@ -312,7 +312,8 @@ public class AppleDisk implements Disk
public DiskAddress getDiskAddress (int track, int sector) public DiskAddress getDiskAddress (int track, int sector)
{ {
// should this return null for invalid addresses? // should this return null for invalid addresses?
assert (isValidAddress (track, sector)) : "Invalid address : " + track + ", " + sector; assert (isValidAddress (track, sector)) : "Invalid address : " + track + ", "
+ sector;
return new AppleDiskAddress (track, sector, this); return new AppleDiskAddress (track, sector, this);
} }
@ -355,25 +356,22 @@ public class AppleDisk implements Disk
assert da.getDisk () == this : "Disk address not applicable to this disk"; assert da.getDisk () == this : "Disk address not applicable to this disk";
assert sectorSize == 256 || sectorSize == 512 : "Invalid sector size : " + sectorSize; assert sectorSize == 256 || sectorSize == 512 : "Invalid sector size : " + sectorSize;
assert interleave >= 0 && interleave <= MAX_INTERLEAVE : "Invalid interleave : " assert interleave >= 0 && interleave <= MAX_INTERLEAVE : "Invalid interleave : "
+ interleave; + interleave;
int diskOffset; int diskOffset;
if (sectorSize == 256) if (sectorSize == 256)
{ {
diskOffset = diskOffset = da.getTrack () * trackSize
da.getTrack () * trackSize + interleaveSector[interleave][da.getSector ()] + interleaveSector[interleave][da.getSector ()] * sectorSize;
* sectorSize;
System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, sectorSize); System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, sectorSize);
} }
else if (sectorSize == 512) else if (sectorSize == 512)
{ {
diskOffset = diskOffset = da.getTrack () * trackSize
da.getTrack () * trackSize + interleaveSector[interleave][da.getSector () * 2] + interleaveSector[interleave][da.getSector () * 2] * 256;
* 256;
System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, 256); System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, 256);
diskOffset = diskOffset = da.getTrack () * trackSize
da.getTrack () * trackSize + interleaveSector[interleave][da.getSector () * 2 + 1] + interleaveSector[interleave][da.getSector () * 2 + 1] * 256;
* 256;
System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset + 256, 256); System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset + 256, 256);
} }
} }
@ -393,8 +391,8 @@ public class AppleDisk implements Disk
public void notifyListeners (String text) public void notifyListeners (String text)
{ {
if (actionListenerList != null) if (actionListenerList != null)
actionListenerList.actionPerformed (new ActionEvent (this, ActionEvent.ACTION_PERFORMED, actionListenerList
text)); .actionPerformed (new ActionEvent (this, ActionEvent.ACTION_PERFORMED, text));
} }
public AppleFileSource getDetails () public AppleFileSource getDetails ()