public void Close()
{
if (FileHandle != null)
{
FileHandle.Close();
FileHandle = null;
}
}
public byte ReadByte(FileHandle handle)
{
if (!handle.Open)
{
return(0);
}
byte ret;
if (handle.reader != null)
{
ret = handle.reader.ReadByte();
if (handle.reader.BaseStream.Position >= handle.reader.BaseStream.Length)
{
handle.Close();
}
return(ret);
}
int sectorStart = GetSectorOffset(handle.track, handle.sector);
ret = _data[sectorStart + handle.offset];
// Last sector?
if (_data[sectorStart] == 0)
{
// Last byte read?
if (handle.offset >= _data[sectorStart + 1])
{
handle.track = 0;
}
else
{
++handle.offset;
}
}
else
{
++handle.offset;
if (handle.offset >= 256)
{
handle.track = _data[sectorStart];
handle.sector = _data[sectorStart + 1];
handle.offset = 2;
}
}
return(ret);
}
void HandleKernalTrap(ushort address)
{
// SETNAM
if (address == 0xffbd)
{
//Debug.Log("SetNam");
// Strip away @0:
byte fileNameLength = _processor.A;
ushort fileNameAddress = (ushort)(_processor.Y * 256 + _processor.X);
if (_ram[fileNameAddress] == 0x40 && _ram[(ushort)(fileNameAddress + 1)] == 0x30)
{
fileNameAddress += 3;
fileNameLength -= 3;
}
_fileName = new byte[fileNameLength];
for (int i = 0; i < _fileName.Length; ++i)
{
_fileName[i] = _ram[fileNameAddress++];
}
}
// CHKIN (actually open the file stream)
else if (address == 0xffc6)
{
//Debug.Log("Chkin");
_fileHandle = _disk.OpenFile(_fileName);
if (_fileHandle == null)
{
Debug.LogWarning("File " + _fileName[0].ToString("X") + " " + _fileName[1].ToString("X") + " not found");
}
}
// CHRIN
else if (address == 0xffcf)
{
if (_fileHandle != null)
{
if (_fileHandle.Open)
{
_processor.A = _disk.ReadByte(_fileHandle);
}
_ram[0x90] = (byte)(_fileHandle.Open ? 0x00 : 0x40);
}
else
{
_ram[0x90] = 0x42; // EOF, file not found
}
}
// CHKOUT
else if (address == 0xffc9)
{
_fileHandle = _disk.OpenFileForWrite(_fileName);
if (_fileHandle == null)
{
Debug.LogError("File " + _fileName[0].ToString("X") + " " + _fileName[1].ToString("X") + " failed to open for write");
}
}
// CHROUT
else if (address == 0xffd2)
{
if (_fileHandle != null)
{
_disk.WriteByte(_fileHandle, _processor.A);
}
}
// CLOSE
else if (address == 0xffc3)
{
//Debug.Log("Close");
if (_fileHandle != null)
{
_fileHandle.Close();
}
_fileHandle = null;
}
// CIOUT - loader detection
else if (address == 0xffa8)
{
//Debug.Log("CIOut");
_ram[0x90] = 0x80; // Error, prevent fastloader from running
}
}