private void PerformMutationOp()
{
int outcome = DiscreteDistribution.Sample(_rng, _opDistribution);
switch (outcome)
{
case 0: // Write.
{
PerformMutationOp_Write();
break;
}
case 1: // Write byte.
{
byte b = (byte)_rng.Next();
_strmA.WriteByte(b);
_strmB.WriteByte(b);
Debug.WriteLine("WriteByte");
break;
}
case 2: // Change read/write head position.
{
PerformMutationOp_Position();
break;
}
case 3: // SetLength
{
PerformMutationOp_SetLength();
break;
}
case 4: // Seek
{
PerformMutationOp_Seek();
break;
}
case 5: // Trim
{
_strmB.Trim();
Debug.WriteLine("Trim");
break;
}
case 6: // Read byte.
{
int a = _strmA.ReadByte();
int b = _strmB.ReadByte();
if (a != b)
{
throw new Exception("ReadByte mismatch");
}
Debug.WriteLine("ReadByte");
break;
}
case 7: // Read
{
int len = _rng.Next(20000);
byte[] abuf = new byte[len];
byte[] bbuf = new byte[len];
int alen = _strmA.Read(abuf, 0, len);
int blen = _strmB.Read(bbuf, 0, len);
if (alen != blen)
{
throw new Exception("Read mismatch");
}
if (!Utils.AreEqual(abuf, bbuf))
{
throw new Exception("Read mismatch");
}
Debug.WriteLine("Read");
break;
}
}
}
