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Changed readSector in an attempt to handle wrapping within a

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track appropriately. Prior to this change, if the sector wrapped
to the beginning of the track, it would throw an exception.
This commit is contained in:
Robert Greene 2004-06-03 03:13:38 +00:00
parent 119297dfa1
commit e41de0c2fd
1 changed files with 6 additions and 8 deletions
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14
src/com/webcodepro/applecommander/storage/physical/NibbleOrder.java
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@ -19,10 +19,10 @@
*/
package com.webcodepro.applecommander.storage.physical;
import com.webcodepro.applecommander.util.AppleUtil;
import java.util.Arrays;
import com.webcodepro.applecommander.util.AppleUtil;
/**
* Supports disk images stored in nibbilized DOS physical order.
* <p>
@ -101,16 +101,14 @@ public class NibbleOrder extends DosOrder {
int offset = 0;
byte[] addressField = new byte[14];
boolean found = false;
while (!found && offset < trackData.length) {
int attempts = getSectorsPerTrack();
while (!found && attempts >= 0) {
int nextOffset = locateField(0xd5, 0xaa, 0x96, trackData, addressField, offset);
if (nextOffset < offset) { // we wrapped!
throw new IllegalArgumentException("Unable to locate physical sector "
+ sector + " on track " + track);
}
attempts--;
offset = nextOffset;
int t = decodeOddEven(addressField, 5);
int s = decodeOddEven(addressField, 7);
found = (t == track && s == sector);
found = (t == track && s == sector);
}
if (!found) {
throw new IllegalArgumentException("Unable to locate physical sector "