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Accomodate some disk image creation bugs

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This commit is contained in:
2012-06-25 15:21:02 +00:00
parent 44cab7e7cb
commit f5599334c5
2 changed files with 30 additions and 2 deletions
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2
src/com/webcodepro/shrinkit/HeaderBlock.java
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@ -85,7 +85,7 @@ public class HeaderBlock {
* each thread's data is read (per NuFX spec).
*/
public void readThreads(LittleEndianByteInputStream bs) throws IOException {
for (long l=0; l<totalThreads; l++) threads.add(new ThreadRecord(bs));
for (long l=0; l<totalThreads; l++) threads.add(new ThreadRecord(this, bs));
for (ThreadRecord r : threads) r.readThreadData(bs);
}

30
src/com/webcodepro/shrinkit/ThreadRecord.java
View File

@ -31,15 +31,43 @@ public class ThreadRecord {
private byte[] threadData;
/**
* Construct the ThreadRecord and read the header details.
* Construct the ThreadRecord and read the header details with no hints
* from the Header Block.
*/
public ThreadRecord(LittleEndianByteInputStream bs) throws IOException {
this(null, bs);
}
/**
* Construct the ThreadRecord and read the header details.
*/
public ThreadRecord(HeaderBlock hb, LittleEndianByteInputStream bs) throws IOException {
threadClass = ThreadClass.find(bs.readWord());
threadFormat = ThreadFormat.find(bs.readWord());
threadKind = ThreadKind.find(bs.readWord(), threadClass);
threadCrc = bs.readWord();
threadEof = bs.readLong();
compThreadEof = bs.readLong();
if ((threadKind == ThreadKind.DISK_IMAGE) && (hb != null)) {
/* If we have hints from the header block, repair some disk image related bugs. */
if (hb.getStorageType() <= 13 ) {
/* supposed to be block size, but SHK v3.0.1 stored it wrong */
threadEof = hb.getExtraType() * 512;
System.out.println("Found erroneous storage type... fixing.");
} else if (hb.getStorageType() == 256 &&
hb.getExtraType() == 280 &&
hb.getFileSysId() == 2 ) { // FileSysDOS33
/*
* Fix for less-common ShrinkIt problem: looks like an old
* version of GS/ShrinkIt used 256 as the block size when
* compressing DOS 3.3 images from 5.25" disks. If that
* appears to be the case here, crank up the block size.
*/
threadEof = hb.getExtraType() * 512;
} else {
threadEof = hb.getExtraType() * hb.getStorageType();
}
}
}
/**