private void OpMax(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(Math.Max(a, b));
}
/// <summary>
/// Multiplies top two numbers on the stack.
/// </summary>
/// <param name="obj"></param>
private void OpMul(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(a * b);
}
private void OpSub(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(b - a);
}
private void OpNumEqual(ParsedOpCode op)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(a == b ? 1 : 0);
}
private void OpBoolOr(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(a != 0 || b != 0 ? 1 : 0);
}
private void OpNumNotEqual(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(a != b ? 1 : 0);
}
private void OpXor(ParsedOpCode op)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(a ^ b);
}
private void OpLessThan(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(b < a ? 1 : 0);
}
private void OpLeft(ParsedOpCode op)
{
var high = MainStack.PopInt32();
var data = MainStack.Pop();
if (data.Length == 0 || high == 0)
{
MainStack.Push(new byte[0]);
}
else if (high < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "upper boundary less than zero");
}
else if (high > data.Length)
{
throw new ScriptIndexOutOfRangeException(op.Code, "upper boundary greater than array length");
}
else if (high < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "upper boundary less than zero");
}
else
{
var bytes = data.Take(high).ToArray();
MainStack.Push(bytes);
}
}
private void OpSubStr(ParsedOpCode op)
{
var startIndex = MainStack.PopInt32();
var endIndexExclusive = MainStack.PopInt32();
var array = MainStack.Pop();
if (array.Length == 0)
{
MainStack.Push(new byte[0]);
}
else if (startIndex < 0 || endIndexExclusive < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "Negative substring index");
}
else if (startIndex > array.Length || endIndexExclusive > array.Length)
{
throw new ScriptIndexOutOfRangeException(op.Code, "Substring index out of bounds");
}
else if (startIndex > endIndexExclusive)
{
throw new ScriptIndexOutOfRangeException(op.Code, "Start index is greater than end index");
}
else if (startIndex == endIndexExclusive)
{
MainStack.Push(new byte[0]);
}
else
{
var substr = array.Skip(startIndex).Take(endIndexExclusive - startIndex).ToArray();
MainStack.Push(substr);
}
}
private void OpRoll()
{
var n = MainStack.PopInt32();
var val = MainStack.Pop(n);
MainStack.Push(val);
}
private void OpGreaterThanOrEqual(ParsedOpCode obj)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
MainStack.Push(b > a ? 1 : 0);
}
private void OpWithin(ParsedOpCode obj)
{
var max = MainStack.PopInt32();
var min = MainStack.PopInt32();
var test = MainStack.PopInt32();
MainStack.Push(min <= test && test < max ? 1 : 0);
}
private void OpMod(ParsedOpCode op)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
if (a == 0)
{
throw new ArithemeticException(op.Code, "Division by zero");
}
MainStack.Push(b % a);
}
private void OpRShift(ParsedOpCode op)
{
var a = MainStack.PopInt32();
var b = MainStack.PopInt32();
if (a < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "Negative shift");
}
if (a > 32)
{
throw new ScriptIndexOutOfRangeException(op.Code, "Shift overflow");
}
MainStack.Push(b >> a);
}
private void OpRotl(ParsedOpCode op)
{
var rotate = MainStack.PopInt32();
var value = MainStack.PopInt32();
if (rotate < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "attempted to rotate by negative value");
}
if (rotate > 31)
{
throw new ScriptIndexOutOfRangeException(op.Code, "attempted to rotate by value > 31");
}
var rotatedValue = (value << rotate) | (value >> (32 - rotate));
MainStack.Push(rotatedValue);
}
private void OpRight(ParsedOpCode op)
{
var index = MainStack.PopInt32();
var data = MainStack.Pop();
if (data.Length == 0 || index == data.Length)
{
MainStack.Push(new byte[0]);
}
else if (index < 0)
{
throw new ScriptIndexOutOfRangeException(op.Code, "upper boundary less than zero");
}
else if (index > data.Length)
{
throw new ScriptIndexOutOfRangeException(op.Code, "upper boundary greater than array length");
}
else
{
MainStack.Push(data.Skip(index).ToArray());
}
}
private void OpAbs(ParsedOpCode obj)
{
var value = MainStack.PopInt32();
MainStack.Push(Math.Abs(value));
}
private void OpInvert(ParsedOpCode op)
{
var value = MainStack.PopInt32();
MainStack.Push(~value);
}
private void Op1Add(ParsedOpCode op)
{
MainStack.Push(MainStack.PopInt32() + 1);
}
private void Op1Sub(ParsedOpCode op)
{
MainStack.Push(MainStack.PopInt32() - 1);
}
private void OpNegate(ParsedOpCode obj)
{
MainStack.Push(-MainStack.PopInt32());
}
private void Op0NotEqual(ParsedOpCode obj)
{
var value = MainStack.PopInt32();
MainStack.Push(value == 0 ? 0 : 1);
}
private void OpNot(ParsedOpCode obj)
{
var value = MainStack.PopInt32();
MainStack.Push(value == 0 ? 1 : 0);
}
private void OpPick()
{
var n = MainStack.PopInt32();
MainStack.Push(MainStack.Peek(n));
}