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Restructured CPM a little bit to enable deletes. #41

This commit is contained in:
Rob Greene 2020-10-07 21:03:48 -05:00
parent a281a50640
commit 237e518d31
2 changed files with 24 additions and 13 deletions
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19
src/main/java/com/webcodepro/applecommander/storage/os/cpm/CpmFileEntry.java
View File

@ -119,11 +119,7 @@ public class CpmFileEntry implements FileEntry {
* Read the fileEntry bytes from the disk image.
*/
protected byte[] readFileEntry(int number) {
byte[] data = new byte[2 * CpmFormatDisk.CPM_BLOCKSIZE];
System.arraycopy(disk.readCpmBlock(0), 0, data,
0, CpmFormatDisk.CPM_BLOCKSIZE);
System.arraycopy(disk.readCpmBlock(1), 0, data,
CpmFormatDisk.CPM_BLOCKSIZE, CpmFormatDisk.CPM_BLOCKSIZE);
byte[] data = disk.readCpmFileEntries();
byte[] entry = new byte[ENTRY_LENGTH];
int offset = ((Integer)offsets.get(number)).intValue();
System.arraycopy(data, offset, entry, 0, ENTRY_LENGTH);
@ -133,14 +129,11 @@ public class CpmFileEntry implements FileEntry {
/**
* Write the fileEntry bytes back to the disk image.
*/
protected void writeFileEntry(int number, byte[] data) {
byte[] block = new byte[CpmFormatDisk.CPM_BLOCKSIZE];
System.arraycopy(data, 0, block,
0, CpmFormatDisk.CPM_BLOCKSIZE);
disk.writeCpmBlock(0, block);
System.arraycopy(data, 0, block,
CpmFormatDisk.CPM_BLOCKSIZE, CpmFormatDisk.CPM_BLOCKSIZE);
disk.writeCpmBlock(1, block);
protected void writeFileEntry(int number, byte[] entry) {
byte[] entries = disk.readCpmFileEntries();
int offset = ((Integer)offsets.get(number)).intValue();
System.arraycopy(entry, 0, entries, offset, ENTRY_LENGTH);
disk.writeCpmFileEntries(entries);
}
/**

18
src/main/java/com/webcodepro/applecommander/storage/os/cpm/CpmFormatDisk.java
View File

@ -443,6 +443,24 @@ public class CpmFormatDisk extends FormattedDisk {
return data;
}
public byte[] readCpmFileEntries() {
byte[] data = new byte[2 * CpmFormatDisk.CPM_BLOCKSIZE];
System.arraycopy(readCpmBlock(0), 0, data,
0, CpmFormatDisk.CPM_BLOCKSIZE);
System.arraycopy(readCpmBlock(1), 0, data,
CpmFormatDisk.CPM_BLOCKSIZE, CpmFormatDisk.CPM_BLOCKSIZE);
return data;
}
public void writeCpmFileEntries(byte[] data) {
byte[] block = new byte[CPM_BLOCKSIZE];
System.arraycopy(data, 0, block,
0, CpmFormatDisk.CPM_BLOCKSIZE);
writeCpmBlock(0, block);
System.arraycopy(data, CpmFormatDisk.CPM_BLOCKSIZE, block,
0, CpmFormatDisk.CPM_BLOCKSIZE);
writeCpmBlock(1, block);
}
/**
* Compute the physical track number.
*/