public override int GetFileFlags(DirectoryEntry entry)
{
int flags = 0;
if (entry.StartSector > 719 && entry.EntryInUse) flags |= 0x1;
if (entry.CreatedInDos2) flags |= 0x2;
if (entry.Locked) flags |= 0x20;
if (entry.EntryInUse && entry.StartSector < 720) flags |= 0x40;
if (entry.Deleted) flags |= 0x80;
return flags;
}
public abstract int GetFileFlags(DirectoryEntry entry);
public override void SetFileFlags(DirectoryEntry entry, int flags)
{
if ((flags & 0x01) > 0 || (flags & 0x40) > 0) entry.EntryInUse = true;
if ((flags & 0x2) > 0) entry.CreatedInDos2 = true;
if ((flags & 0x20) > 0) entry.Locked = true;
if ((flags & 0x80) > 0) entry.Deleted = true;
}
public override int GetFileFlags(DirectoryEntry entry)
{
return 0;
}
public abstract void SetFileFlags(DirectoryEntry entry, int flags);
public override int GetFileFlags(DirectoryEntry entry)
{
int flags = 0;
if (entry.OpenForOutput) flags |= 0x1;
if (entry.CreatedInDos2) flags |= 0x2;
if (entry.Locked) flags |= 0x20;
if (entry.EntryInUse) flags |= 0x40;
if (entry.Deleted) flags |= 0x80;
return flags;
}
public override void SetFileFlags(DirectoryEntry entry, int flags)
{
throw new System.NotImplementedException();
}
/// <summary>
/// Adds a directory entry
/// </summary>
/// <param name="entry"></param>
public void AddEntry(DirectoryEntry entry)
{
entries.Add(entry);
}
/// -----------------------------------------------------------------------------
/// <summary>
/// Writes a directory entry back to the disk
/// </summary>
/// <param name="entry">Directory entry to write</param>
/// <remarks>
/// </remarks>
/// -----------------------------------------------------------------------------
protected void WriteDirectoryEntry(DirectoryEntry entry)
{
byte[] sec;
int i;
string filename;
string ext;
int sector, offset;
DirectorySectorLocation(entry.FileNumber, out sector, out offset);
sec = ReadSector(sector);
// Write flags
sec[offset] = (byte)GetFileFlags(entry);
// Write location information
sec[offset + 2] = (byte)(entry.NumSectors >> 8);
sec[offset + 1] = (byte)(entry.NumSectors & 0xff);
sec[offset + 4] = (byte)(entry.StartSector >> 8);
sec[offset + 3] = (byte)(entry.StartSector & 0xff);
//Split filename
i = entry.FileName.IndexOf(".");
if (i > -1)
{
filename = entry.FileName.Substring(0, i);
ext = entry.FileName.Substring(i + 1);
}
else
{
filename = entry.FileName;
ext = "";
}
filename = filename.PadRight(8);
ext = ext.PadRight(3);
//Write filename
StringToBytes(sec, filename, offset + 5);
StringToBytes(sec, ext, offset + 13);
WriteSector(sector, sec);
}
/// <summary>
/// Finds the next open directory entry and creates a new entry at
/// that locaiton
/// </summary>
/// <returns>New DirectoryEntry object</returns>
private DirectoryEntry GetOpenEntry()
{
//Try to find an already open entry
foreach (DirectoryEntry ent in directory)
{
if (!ent.EntryInUse && ent.Deleted) return ent;
}
//Check if directory is full
if (directory.Count == maxFiles) return null;
//Create a new entry
DirectoryEntry entry = new DirectoryEntry();
entry.FileNumber = directory.Count;
directory.Add(entry);
return entry;
}
/// <summary>
/// Read the directory from the disk
/// </summary>
public override void ReadDirectory()
{
int curSector = DirectoryStartSector;
byte[] sec;
int fileNumber = 0;
directory = new List<DirectoryEntry>();
while ((curSector <= DirectoryEndSector))
{
sec = ReadSector(curSector);
int pos = 0;
while ((pos < 128))
{
DirectoryEntry entry = new DirectoryEntry();
// Get flags
int flags = sec[pos];
SetFileFlags(entry, flags);
if (!entry.EntryInUse && !entry.Deleted) return;
//Assign filenumber
entry.FileNumber = fileNumber;
fileNumber += 1;
//Get file location information
entry.NumSectors = sec[pos + 2] * 256 + sec[pos + 1];
entry.StartSector = sec[pos + 4] * 256 + sec[pos + 3];
//Check location information
if (entry.StartSector < 4 | (entry.StartSector > 359 & entry.StartSector < 369) | entry.StartSector > LastUsableSector)
{
entry.ValidEntry = false;
entry.ErrorList.Add(DirectoryEntry.EntryError.InvalidStartSector);
}
if (entry.NumSectors < 1 | entry.NumSectors > AvailableSectors())
{
entry.ValidEntry = false;
entry.ErrorList.Add(DirectoryEntry.EntryError.InvalidNumberOfSectors);
}
//Check filename
if (sec[pos + 5] < 65 | sec[pos + 5] > 90)
{
entry.ValidEntry = false;
entry.ErrorList.Add(DirectoryEntry.EntryError.FileNameInvalidCharacters);
}
for (int i = 6; i <= 15; i++)
{
if (!ValidFileNameCharacter((char)(sec[pos + i])))
{
entry.ValidEntry = false;
entry.ErrorList.Add(DirectoryEntry.EntryError.FileNameInvalidCharacters);
break;
}
}
//Get filename
entry.FileName = BytesToString(sec, pos + 5, pos + 12).Trim();
string extension = BytesToString(sec, pos + 13, pos + 15).Trim();
if (extension != "") entry.FileName += "." + extension;
//Add entry
directory.Add(entry);
pos += 16;
}
curSector += 1;
}
}
/// <summary>
/// Read the directory from the disk
/// </summary>
public override void DumpDirectory()
{
int curSector = DirectoryStartSector;
byte[] sec;
int fileNumber = 0;
while ((curSector <= DirectoryEndSector))
{
sec = ReadSector(curSector);
int pos = 0;
while ((pos < 128))
{
DirectoryEntry entry = new DirectoryEntry();
// Get flags
int flags = sec[pos];
SetFileFlags(entry, flags);
//Assign filenumber
entry.FileNumber = fileNumber;
fileNumber += 1;
//Get file location information
entry.NumSectors = sec[pos + 2] * 256 + sec[pos + 1];
entry.StartSector = sec[pos + 4] * 256 + sec[pos + 3];
//Get filename
entry.FileName = BytesToString(sec, pos + 5, pos + 12).Trim();
string extension = BytesToString(sec, pos + 13, pos + 15).Trim();
if (extension != "") entry.FileName += "." + extension;
pos += 16;
System.Diagnostics.Debug.WriteLine(string.Format("{0}: {1}, In Use: {2}, Delete: {3}, Dos2: {4}",entry.FileNumber, entry.FileName.ToString(), entry.EntryInUse, entry.Deleted, entry.CreatedInDos2));
}
curSector += 1;
}
}