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Tighten up image detection a little more

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This commit is contained in:
2012-07-06 21:14:54 +00:00
parent 852522d58d
commit e09b66a7dd
1 changed files with 88 additions and 51 deletions
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139
src/com/webcodepro/applecommander/storage/Disk.java
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@ -95,7 +95,7 @@ public class Disk {
private String filename;
private boolean newImage = false;
private ByteArrayImageLayout diskImageManager;
private ImageOrder imageOrder;
private ImageOrder imageOrder = null;
/**
* Get the supported file filters supported by the Disk interface.
@ -175,14 +175,15 @@ public class Disk {
*/
public Disk(String filename) throws IOException {
this.filename = filename;
File file = new File(filename);
int diskSize = 0;
byte[] diskImage = null;
if (isSDK()) {
// If we have an SDK, unpack it and branch around all this nonsense
// If we have an SDK, unpack it and send along the byte array
diskImage = com.webcodepro.shrinkit.Utilities.unpackSDKFile(filename);
diskSize = diskImage.length;
} else {
File file = new File(filename);
diskSize = (int) file.length();
InputStream input = new FileInputStream(file);
if (isCompressed()) {
@ -206,48 +207,52 @@ public class Disk {
ImageOrder dosOrder = new DosOrder(diskImageManager);
ImageOrder proDosOrder = new ProdosOrder(diskImageManager);
/*
* First step: test physical disk orders for viable file systems.
*/
int rc = -1;
if (diskSize == APPLE_140KB_DISK) {
// First, test the really-really likely orders/formats for
// 5-1/4" disks.
imageOrder = dosOrder;
if (isProdosFormat() || isDosFormat()) {
rc = 0;
} else {
imageOrder = proDosOrder;
if (isSDK()) {
imageOrder = proDosOrder; // SDKs are always in ProDOS order
} else {
/*
* First step: test physical disk orders for viable file systems.
*/
int rc = -1;
if (diskSize == APPLE_140KB_DISK) {
// First, test the really-really likely orders/formats for
// 5-1/4" disks.
imageOrder = dosOrder;
if (isProdosFormat() || isDosFormat()) {
rc = 0;
} else {
imageOrder = proDosOrder;
if (isProdosFormat() || isDosFormat()) {
rc = 0;
}
}
if (rc == -1) {
/*
* Ok, it's not one of those. Now, let's go back to DOS
* order, and see if we recognize other things. If not,
* we'll fall through to other processing later.
*/
imageOrder = dosOrder;
rc = testImageOrder();
}
}
if (rc == -1) {
/*
* Ok, it's not one of those. Now, let's go back to DOS
* order, and see if we recognize other things. If not,
* we'll fall through to other processing later.
*/
imageOrder = dosOrder;
imageOrder = proDosOrder;
rc = testImageOrder();
}
}
if (rc == -1) {
imageOrder = proDosOrder;
rc = testImageOrder();
if (rc == -1) {
/*
* Couldn't find anything recognizable. Final step:
* just punt and start testing filenames.
*/
if (isProdosOrder() || is2ImgOrder()) {
imageOrder = proDosOrder;
} else if (isDosOrder()) {
imageOrder = dosOrder;
} else if (isNibbleOrder()) {
imageOrder = new NibbleOrder(diskImageManager);
} else {
imageOrder = proDosOrder;
if (rc == -1) {
/*
* Couldn't find anything recognizable. Final step:
* just punt and start testing filenames.
*/
if (isProdosOrder() || is2ImgOrder()) {
imageOrder = proDosOrder;
} else if (isDosOrder()) {
imageOrder = dosOrder;
} else if (isNibbleOrder()) {
imageOrder = new NibbleOrder(diskImageManager);
} else {
imageOrder = proDosOrder;
}
}
}
}
@ -486,9 +491,14 @@ public class Disk {
*/
public boolean isProdosFormat() {
byte[] prodosVolumeDirectory = readBlock(2);
int volDirEntryLength = prodosVolumeDirectory[0x23];
int volDirEntriesPerBlock = prodosVolumeDirectory[0x24];
return prodosVolumeDirectory[0] == 0 &&
prodosVolumeDirectory[1] == 0 &&
(prodosVolumeDirectory[4]&0xf0) == 0xf0;
(prodosVolumeDirectory[4]&0xf0) == 0xf0 &&
(volDirEntryLength * volDirEntriesPerBlock <= 512)
;
}
/**
@ -497,17 +507,44 @@ public class Disk {
* different characteristics. This just tests 140KB images.
*/
public boolean isDosFormat() {
if (!is140KbDisk()) return false;
byte[] vtoc = readSector(17, 0);
return (imageOrder.isSizeApprox(APPLE_140KB_DISK)
|| imageOrder.isSizeApprox(APPLE_140KB_NIBBLE_DISK))
&& vtoc[0x01] == 17 // expect catalog to start on track 17
// can vary && vtoc[0x02] == 15 // expect catalog to start on sector 15 (140KB disk only!)
&& vtoc[0x27] == 122 // expect 122 tract/sector pairs per sector
&& vtoc[0x34] == 35 // expect 35 tracks per disk (140KB disk only!)
&& vtoc[0x35] == 16; // expect 16 sectors per disk (140KB disk only!)
// && vtoc[0x36] == 0 // bytes per sector (low byte)
// && vtoc[0x37] == 1; // bytes per sector (high byte)
boolean good = false;
if (!is140KbDisk()) {
return false;
}
try {
byte[] vtoc = readSector(17, 0);
good = (imageOrder.isSizeApprox(APPLE_140KB_DISK)
|| imageOrder.isSizeApprox(APPLE_140KB_NIBBLE_DISK))
&& vtoc[0x01] == 17 // expect catalog to start on track 17
// can vary && vtoc[0x02] == 15 // expect catalog to start on sector 15 (140KB disk only!)
&& vtoc[0x27] == 122 // expect 122 track/sector pairs per sector
&& vtoc[0x34] == 35 // expect 35 tracks per disk (140KB disk only!)
&& vtoc[0x35] == 16 // expect 16 sectors per disk (140KB disk only!)
;
if (good) {
int catTrack = vtoc[0x01]; // Pull out the first catalog track/sector
int catSect = vtoc[0x02];
byte[] cat = readSector(catTrack, catSect);
if (catTrack == cat[1] && catSect == cat[2] + 1) {
// Still good... let's follow one more
catTrack = cat[1];
catSect = cat[2];
cat = readSector(catTrack, catSect);
if (catTrack == cat[1] && catSect == cat[2] + 1) {
good = true;
} else {
good = false;
}
}
}
} catch (Exception ex) {
/*
* If we get various exceptions from reading tracks and sectors, then we
* definitely don't have a valid DOS image.
*/
good = false;
}
return good;
}
/**