private bool Run()
{
_zMemory.Running = true;
bool restart = false;
while (_zMemory.Running)
{
var opCode = _zMemory.GetCurrentByteAndInc();
IOperation operation;
OpCodes opCodeEnum;
(opCode, opCodeEnum, operation) = _zOperations.GetOperation(opCode);
if (opCodeEnum == OpCodes.Restart)
{
restart = true;
break;
}
if (operation == null)
{
throw new Exception($"No operation found for Op Code {opCode} ({opCode:X2})!");
}
Log.WriteLine($" OP: {opCodeEnum:D} ({(byte)opCodeEnum:X2}) - {operation.GetType().Name})");
var args = _zMemory.OperandManager.GetOperands(opCode);
if (opCodeEnum == OpCodes.Read && !_interruptMode)
{
_io.ShowStatus(_zMemory);
Read read = (Read)operation;
read.SetParseAddresses(args[0], args[1]);
break;
}
operation.Execute(args);
Log.Flush();
}
return(restart);
}
public (byte opCode, OpCodes opCodeEnum, IOperation operation) GetOperation(byte opCode)
{
//NOTE: http://inform-fiction.org/zmachine/standards/z1point1/sect14.html
IOperation operation;
OpCodes opCodeEnum;
if (opCode == (byte)OpCodes.Extended) // 0OP:190 - special op, indicates next byte contains Extended Op
{
opCodeEnum = OpCodes.Extended;
opCode = _zMemory.GetCurrentByteAndInc();
_extendedOperations.TryGetValue((KindExtOpCodes)(opCode & 0x1f), out operation);
// TODO: hack to make this a VAR opcode...
opCode |= 0xc0;
}
else
{
opCodeEnum = opCode.ToOpCode();
_operations.TryGetValue(opCodeEnum, out operation);
}
return(opCode, opCodeEnum, operation);
}