/// <summary>
/// Get next mutation change (if happend)
/// </summary>
/// <param name="stream">Stream</param>
/// <param name="offset">Offset</param>
/// <param name="index">Index</param>
public MutationalChange Get(FuzzingStream stream, long offset, int index)
{
if (ValidOffset?.ItsValid(offset) == false)
{
return(null);
}
switch (FuzzPercentType)
{
case EFuzzingPercentType.PeerByte:
{
// Check Max changes
if (MaxChanges != null &&
stream.Log.Length >= MaxChanges.Get())
{
return(null);
}
// Check Percent
if (FuzzPercent != null)
{
var value = FuzzPercent.Get();
if (!RandomHelper.IsRandomPercentOk(value))
{
return(null);
}
}
// Get Item
return(Changes.Get());
}
case EFuzzingPercentType.PeerStream:
{
// Check Max changes
var s = (Step)stream.Variables[index];
if (stream.Log.Length >= s.MaxChanges)
{
return(null);
}
if (!s.FuzzIndex.Contains(offset))
{
return(null);
}
// Get Item
return(Changes.Get());
}
default:
{
throw new ArgumentException(nameof(FuzzPercentType));
}
}
}