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AppleCommander
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Code Issues Projects Releases Wiki Activity

Can now create a blank disk and format it.

This commit is contained in:
Robert Greene 2002-12-09 05:45:02 +00:00
parent 669007afdc
commit 010ee8e488
1 changed files with 132 additions and 54 deletions
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186
src/com/webcodepro/applecommander/storage/DosFormatDisk.java
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@ -20,7 +20,6 @@
package com.webcodepro.applecommander.storage;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;
/**
@ -42,6 +41,14 @@ public class DosFormatDisk extends FormattedDisk {
* Indicates the index of the sector in the location array.
*/
public static final int SECTOR_LOCATION_INDEX = 1;
/**
* The standard DOS 3.3 catalog track.
*/
public static final int CATALOG_TRACK = 17;
/**
* The standard VTOC sector.
*/
public static final int VTOC_SECTOR = 0;
/**
* Use this inner interface for managing the disk usage data.
@ -72,11 +79,8 @@ public class DosFormatDisk extends FormattedDisk {
if (location == null || location.length != 2) {
throw new IllegalArgumentException("Invalid dimension for isFree! Did you call next first?");
}
byte[] vtoc = getVtoc();
byte byt = vtoc[0x38 + (location[TRACK_LOCATION_INDEX] * 4)
+ (location[SECTOR_LOCATION_INDEX] / 8)];
boolean free = AppleUtil.isBitSet(byt, 7 - (location[SECTOR_LOCATION_INDEX] % 8));
return free;
return isSectorFree(location[TRACK_LOCATION_INDEX],
location[SECTOR_LOCATION_INDEX], readVtoc());
}
public boolean isUsed() {
return !isFree();
@ -93,6 +97,17 @@ public class DosFormatDisk extends FormattedDisk {
super(filename, diskImage);
}
/**
* Constructor for DosFormatDisk. All DOS disk images are expected to
* be 140K in size.
* @param filename
* @param diskImage
* @param order
*/
public DosFormatDisk(String filename) {
super(filename, new byte[APPLE_140KB_DISK]);
}
/**
* Identify the operating system format of this disk as DOS 3.3.
* @see com.webcodepro.applecommander.storage.Disk#getFormat()
@ -107,7 +122,7 @@ public class DosFormatDisk extends FormattedDisk {
*/
public List getFiles() {
List list = new ArrayList();
byte[] vtoc = getVtoc();
byte[] vtoc = readVtoc();
int track = AppleUtil.getUnsignedByte(vtoc[1]);
int sector = AppleUtil.getUnsignedByte(vtoc[2]);
while (track != 0) { // iterate through all catalog sectors
@ -149,7 +164,7 @@ public class DosFormatDisk extends FormattedDisk {
* Comput the number of free sectors available on the disk.
*/
public int getFreeSectors() {
byte[] vtoc = getVtoc();
byte[] vtoc = readVtoc();
int freeSectors = 0;
for (int offset=0x38; offset<0xff; offset++) {
byte bitmap = vtoc[offset];
@ -189,56 +204,15 @@ public class DosFormatDisk extends FormattedDisk {
* @see com.webcodepro.applecommander.storage.Disk#getDiskName()
*/
public String getDiskName() {
int volumeNumber = AppleUtil.getUnsignedByte(getVtoc()[0x06]);
int volumeNumber = AppleUtil.getUnsignedByte(readVtoc()[0x06]);
return "DISK VOLUME #" + volumeNumber;
}
/**
* Return the VTOC (Volume Table Of Contents).
*/
protected byte[] getVtoc() {
return readSector(0x11, 0);
}
/**
* Get the disk usage bitmap. The size could vary and is stored in the
* VTOC.
* @see com.webcodepro.applecommander.storage.FormattedDisk#getBitmap()
* @deprecated DOS 3.3.po comes up with 448 entries in the bitmap?!
*/
public BitSet getBitmap() {
byte[] vtoc = getVtoc();
int tracks = getTracks();
int sectors = getSectors();
BitSet bitmap = new BitSet(tracks * sectors);
// individually test each track & sector - should handle 140K or 400K disks!
int count = 0;
for (int t=0; t<tracks; t++) {
for (int s=0; s<sectors; s++) {
byte byt = vtoc[0x38 + (t * 4) + (s / 8)];
boolean free = AppleUtil.isBitSet(byt, 7 - (s % 8));
bitmap.set(count, free);
count++;
}
}
return bitmap;
}
/**
* Get the free setting for the bitmap at a specific location.
* The location is specified by an int array to support block
* and track/sector formatted disks.
* @deprecated
*/
public boolean isLocationFree(int[] location) {
if (location == null || location.length != 2) {
throw new IllegalArgumentException("Invalid dimension for isLocationFree!");
}
byte[] vtoc = getVtoc();
byte byt = vtoc[0x38 + (location[TRACK_LOCATION_INDEX] * 4)
+ (location[SECTOR_LOCATION_INDEX] / 8)];
boolean free = AppleUtil.isBitSet(byt, 7 - (location[SECTOR_LOCATION_INDEX] % 8));
return free;
protected byte[] readVtoc() {
return readSector(CATALOG_TRACK, VTOC_SECTOR);
}
/**
@ -252,7 +226,7 @@ public class DosFormatDisk extends FormattedDisk {
* Get the number of tracks on this disk.
*/
public int getTracks() {
byte[] vtoc = getVtoc();
byte[] vtoc = readVtoc();
return AppleUtil.getUnsignedByte(vtoc[0x34]);
}
@ -260,7 +234,7 @@ public class DosFormatDisk extends FormattedDisk {
* Get the number of sectors on this disk.
*/
public int getSectors() {
byte[] vtoc = getVtoc();
byte[] vtoc = readVtoc();
return AppleUtil.getUnsignedByte(vtoc[0x35]);
}
@ -395,4 +369,108 @@ public class DosFormatDisk extends FormattedDisk {
}
return fileData;
}
/**
* Format the disk as DOS 3.3.
* @see com.webcodepro.applecommander.storage.FormattedDisk#format()
*/
public void format() {
writeBootCode();
// create catalog sectors
byte[] data = new byte[SECTOR_SIZE];
for (int sector=15; sector > 0; sector--) {
if (sector == 0) {
data[0x01] = CATALOG_TRACK;
data[0x02] = (byte)(sector-1);
} else {
data[0x01] = 0;
data[0x02] = 0;
}
writeSector(CATALOG_TRACK, sector, data);
}
// create VTOC
data[0x01] = CATALOG_TRACK; // track# of first catalog sector
data[0x02] = 15; // sector# of first catalog sector
data[0x03] = 3; // DOS 3.3 formatted
data[0x06] = (byte)254; // DISK VOLUME#
data[0x27] = 122; // maximum # of T/S pairs in a sector
data[0x30] = CATALOG_TRACK+1; // last track where sectors allocated
data[0x31] = 1; // direction of allocation
data[0x34] = 35; // tracks per disk
data[0x35] = 16; // sectors per disk
data[0x37] = 1; // 36/37 are # of bytes per sector
for (int track=0; track<35; track++) {
for (int sector=0; sector<16; sector++) {
if (track == 0 || track == CATALOG_TRACK) {
setSectorUsed(track, sector, data);
} else {
setSectorFree(track, sector, data);
}
}
}
writeSector(CATALOG_TRACK, VTOC_SECTOR, data);
}
/**
* Indicates if a specific track/sector is free.
*/
public boolean isSectorFree(int track, int sector, byte[] vtoc) {
checkRange(track, sector);
byte byt = vtoc[getFreeMapByte(track, sector)];
return AppleUtil.isBitSet(byt, getFreeMapBit(sector));
}
/**
* Indicates if a specific track/sector is used.
*/
public boolean isSectorUsed(int track, int sector, byte[] vtoc) {
return !isSectorFree(track, sector, vtoc);
}
/**
* Sets the track/sector indicator to free.
*/
public void setSectorFree(int track, int sector, byte[] vtoc) {
checkRange(track, sector);
int offset = getFreeMapByte(track, sector);
byte byt = vtoc[offset];
byt = AppleUtil.setBit(byt, getFreeMapBit(sector));
vtoc[offset] = byt;
}
/**
* Sets the track/sector indicator to used.
*/
public void setSectorUsed(int track, int sector, byte[] vtoc) {
checkRange(track, sector);
int offset = getFreeMapByte(track, sector);
byte byt = vtoc[offset];
byt = AppleUtil.clearBit(byt, getFreeMapBit(sector));
vtoc[offset] = byt;
}
/**
* Compute the VTOC byte for the T/S map.
*/
protected int getFreeMapByte(int track, int sector) {
return 0x38 + (track * 4) + (sector / 8);
}
/**
* Compute the VTOC bit for the T/S map.
*/
protected int getFreeMapBit(int sector) {
return 7 - (sector % 8);
}
/**
* Validate track/sector range.
*/
protected void checkRange(int track, int sector) {
if (track > 35 || sector > 32) {
throw new IllegalArgumentException(
"Invalid track (" + track + "), sector (" + sector
+ ") combination.");
}
}
}