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Updated to adhere to the DirectoryEntry interface; subdirectories can

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now be "extended" (additional blocks allocated to the directory);
started to add variables for constants in the hopes of making the code
a bit more obvious in its intent.
This commit is contained in:
Robert Greene 2003-03-06 03:52:18 +00:00
parent 563ebe4593
commit e30264593c
1 changed files with 63 additions and 17 deletions
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72
src/com/webcodepro/applecommander/storage/ProdosFormatDisk.java
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@ -33,6 +33,20 @@ import java.util.Properties;
* @author: Rob Greene
*/
public class ProdosFormatDisk extends FormattedDisk {
/**
* The location of the "next block" pointer in a directory entry.
* This is a 2-byte word (lo/hi) format. $0000 is end of directory.
*/
private static final int NEXT_BLOCK_POINTER = 2;
/**
* The location of the "previous block" pointer in a directory entry.
* This is a 2-byte word (lo/hi) format. $0000 is start of directory.
*/
private static final int PREV_BLOCK_POINTER = 0;
/**
* The Volume Directory block number.
*/
private static final int VOLUME_DIRECTORY_BLOCK = 2;
/**
* A complete list of all known ProDOS filetypes. Note that this
* list really cannot be complete, as there are multiple mappings per
@ -195,7 +209,25 @@ public class ProdosFormatDisk extends FormattedDisk {
}
offset+= ProdosCommonEntry.ENTRY_LENGTH;
}
blockNumber = AppleUtil.getWordValue(block, 2);
int nextBlockNumber = AppleUtil.getWordValue(block, NEXT_BLOCK_POINTER);
if (nextBlockNumber == 0 && directory instanceof ProdosSubdirectoryHeader) {
byte[] volumeBitmap = readVolumeBitMap();
nextBlockNumber = findFreeBlock(volumeBitmap);
setBlockUsed(volumeBitmap, nextBlockNumber);
writeVolumeBitMap(volumeBitmap);
byte[] oldBlock = readBlock(blockNumber);
AppleUtil.setWordValue(oldBlock, NEXT_BLOCK_POINTER, nextBlockNumber);
writeBlock(blockNumber, oldBlock);
byte[] nextBlock = new byte[BLOCK_SIZE];
AppleUtil.setWordValue(nextBlock, PREV_BLOCK_POINTER, blockNumber);
writeBlock(nextBlockNumber, nextBlock);
ProdosSubdirectoryHeader header = (ProdosSubdirectoryHeader) directory;
int blockCount = header.getProdosDirectoryEntry().getBlocksUsed();
blockCount++;
header.getProdosDirectoryEntry().setBlocksUsed(blockCount);
header.getProdosDirectoryEntry().setEofPosition(blockCount * BLOCK_SIZE);
}
blockNumber = nextBlockNumber;
}
throw new DiskFullException("Unable to allocate more space for another file!");
}
@ -205,7 +237,7 @@ public class ProdosFormatDisk extends FormattedDisk {
* @see com.webcodepro.applecommander.storage.Disk#getFiles()
*/
public List getFiles() {
return getFiles(2);
return getFiles(VOLUME_DIRECTORY_BLOCK);
}
/**
@ -225,17 +257,19 @@ public class ProdosFormatDisk extends FormattedDisk {
} else if (!tester.isEmpty()) {
ProdosFileEntry fileEntry =
new ProdosFileEntry(this, blockNumber, offset);
files.add(fileEntry);
if (fileEntry.isDirectory()) {
int keyPointer = fileEntry.getKeyPointer();
fileEntry.setSubdirectoryHeader(
ProdosDirectoryEntry directoryEntry =
new ProdosDirectoryEntry(this, blockNumber, offset,
new ProdosSubdirectoryHeader(this, keyPointer));
fileEntry.setFiles(getFiles(keyPointer));
files.add(directoryEntry);
} else {
files.add(fileEntry);
}
}
offset+= ProdosCommonEntry.ENTRY_LENGTH;
}
blockNumber = AppleUtil.getWordValue(block, 2);
blockNumber = AppleUtil.getWordValue(block, NEXT_BLOCK_POINTER);
}
return files;
}
@ -280,10 +314,21 @@ public class ProdosFormatDisk extends FormattedDisk {
}
/**
* Identify if this disk format is capable of having directories.
* @see com.webcodepro.applecommander.storage.Disk#hasDirectories()
* Identify if additional directories can be created. This
* may indicate that directories are not available to this
* operating system or simply that the disk image is "locked"
* to writing.
*/
public boolean canHaveDirectories() {
public boolean canCreateDirectories() {
return false;
}
/**
* Indicates if this disk image can create a file.
* If not, the reason may be as simple as it has not beem implemented
* to something specific about the disk.
*/
public boolean canCreateFile() {
return true;
}
@ -414,16 +459,17 @@ public class ProdosFormatDisk extends FormattedDisk {
}
/**
* Indicates if this disk image can write data to a file.
* Identify if this disk format is capable of having directories.
* @see com.webcodepro.applecommander.storage.Disk#canHaveDirectories()
*/
public boolean canWriteFileData() {
public boolean canHaveDirectories() {
return true;
}
/**
* Indicates if this disk image can create a file.
* Indicates if this disk image can write data to a file.
*/
public boolean canCreateFile() {
public boolean canWriteFileData() {
return true;
}