Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if ((int)valueLength < 2 || (int)valueLength % 4 != 2)
{
return((Option)null);
}
byte num1 = buffer[offset++];
if ((int)num1 % 4 != 1 || (int)num1 < 5)
{
return((Option)null);
}
byte pointedIndex = (byte)((int)num1 / 4 - 1);
byte num2 = buffer[offset++];
IpV4OptionTimestampType timestampType = (IpV4OptionTimestampType)((uint)num2 & 15U);
byte overflow = (byte)((uint)num2 >> 4);
int numValues = (int)valueLength / 4;
switch (timestampType)
{
case IpV4OptionTimestampType.TimestampOnly:
return((Option)IpV4OptionTimestampOnly.Read(overflow, pointedIndex, buffer, ref offset, numValues));
case IpV4OptionTimestampType.AddressAndTimestamp:
case IpV4OptionTimestampType.AddressPrespecified:
return((Option)IpV4OptionTimestampAndAddress.Read(timestampType, overflow, pointedIndex, buffer, ref offset, numValues));
default:
return((Option)null);
}
}
Option IOptionComplexFactory.CreateInstance(byte[] buffer, ref int offset, byte valueLength)
{
if (valueLength < OptionValueMinimumLength || valueLength % 4 != 2)
{
return(null);
}
byte pointer = buffer[offset++];
if (pointer % 4 != 1 || pointer < 5)
{
return(null);
}
byte pointedIndex = (byte)(pointer / 4 - 1);
byte overflow = buffer[offset++];
IpV4OptionTimestampType timestampType = (IpV4OptionTimestampType)(overflow & 0x0F);
overflow >>= 4;
int numValues = valueLength / 4;
switch (timestampType)
{
case IpV4OptionTimestampType.TimestampOnly:
return(IpV4OptionTimestampOnly.Read(overflow, pointedIndex, buffer, ref offset, numValues));
case IpV4OptionTimestampType.AddressAndTimestamp:
case IpV4OptionTimestampType.AddressPrespecified:
return(IpV4OptionTimestampAndAddress.Read(timestampType, overflow, pointedIndex, buffer, ref offset, numValues));
default:
return(null);
}
}
public void IpV4OptionTimestampPointedIndexErrorTest()
{
Random random = new Random();
IpV4Option option = new IpV4OptionTimestampOnly(0, random.NextByte(IpV4OptionTimestamp.PointedIndexMaxValue + 1, byte.MaxValue + 1));
Assert.IsNotNull(option);
Assert.Fail();
}
public void IpV4OptionTimestampOverflowErrorTest()
{
Random random = new Random();
IpV4Option option = new IpV4OptionTimestampOnly(random.NextByte(IpV4OptionTimestamp.OverflowMaxValue + 1, byte.MaxValue + 1), 0);
Assert.IsNotNull(option);
Assert.Fail();
}