/// <summary>
/// Initialize instance with array of octets of IP Address.
/// </summary>
/// <param name="ipAddress">Array of octets of IP Address.</param>
public NetworkMask(Octet[] ipAddress)
{
int n = ipAddress[0].Decimal;
if (n < 128)
Prefix = 8;
else if (n < 192)
Prefix = 16;
else if (n < 224)
Prefix = 24;
else
Prefix = 32;
}
/// <summary>
/// Converts from string of subnet mask to prefix
/// </summary>
/// <param name="subnet">A string of subnet mask looks like 255.255.0.0</param>
/// <returns></returns>
public static int ToPrefix(string subnet)
{
Octet[] subnetOctet = new Octet[4];
subnetOctet = ToOctet(subnet);
int prefix = 0;
byte[] temp = { 0, 128, 192, 224, 240, 248, 252, 254, 255 };
foreach (Octet i in subnetOctet)
for (int j = 0; j < temp.Length; j++)
if (i.Decimal == temp[j])
prefix += j;
return prefix;
}
/// <summary>
/// Determines IPv4 class of an array of octets.
/// </summary>
/// <param name="ipAddr">An array of octets of IPv4 address.</param>
/// <returns></returns>
public static IPv4Class ToNetworkClass(Octet[] ipAddr)
{
int n = ipAddr[0].Decimal;
if (n < 128)
return IPv4Class.A;
else if (n < 192)
return IPv4Class.B;
else if (n < 224)
return IPv4Class.C;
else if (n < 240)
return IPv4Class.D;
else
return IPv4Class.E;
}
/// <summary>
/// Convert prefix number to octets array.
/// </summary>
/// <param name="prefix">Prefix number is less than 32.</param>
/// <returns></returns>
public static Octet[] ToOctet(int prefix)
{
Octet[] subnetOctet = new Octet[4];
byte[] temp = { 0, 128, 192, 224, 240, 248, 252, 254, 255 };
for (int i = 0; i < subnetOctet.Length; i++)
{
if (prefix > 8)
{
subnetOctet[i] = new Octet(255);
prefix -= 8;
}
else
{
subnetOctet[i] = new Octet(temp[prefix]);
prefix = 0;
}
}
return subnetOctet;
}
/// <summary>
/// Initialize IPv4 address
/// </summary>
/// <param name="addr">An array of octet of IPv4 address.</param>
/// <param name="subnetMask">Subnet mask of IPv4 address.</param>
/// <param name="ipClass">Class of IPv4 address.</param>
public IPv4Address(Octet[] addr, SubnetMask subnetMask, IPv4Class ipClass)
{
Octet = addr;
_mask = new NetworkMask(subnetMask);
_class = ipClass;
}