public IPNetwork(TAddress address, TAddress subnetMask)
{
// calculate base address by ANDing address with subnet mask
TAddress baseAddress = address.BitwiseAnd(subnetMask);
BaseAddress = baseAddress;
SubnetMask = subnetMask;
CidrPrefix = CalcIPUtils.CidrPrefixFromSubnetMaskBytes(subnetMask.Bytes);
}
public static TAddress UnravelAddress <TAddress>(TAddress address, TAddress subnetMask)
where TAddress : struct, IIPAddress <TAddress>
{
if (CalcIPUtils.CidrPrefixFromSubnetMaskBytes(subnetMask.Bytes).HasValue)
{
// nothing to unravel :)
return(address);
}
// given an address ABCDEFGH with subnet mask 11001001, turn it into ABEHCDFG (i.e. with subnet mask 11110000)
byte[] addressBytes = address.Bytes;
byte[] maskBytes = subnetMask.Bytes;
var netBits = new List <bool>(addressBytes.Length);
var hostBits = new List <bool>(addressBytes.Length);
// find the bits
for (int i = 0; i < addressBytes.Length; ++i)
{
for (int bit = 7; bit >= 0; --bit)
{
bool addressBit = ((addressBytes[i] & (1 << bit)) != 0);
bool isNet = ((maskBytes[i] & (1 << bit)) != 0);
if (isNet)
{
netBits.Add(addressBit);
}
else
{
hostBits.Add(addressBit);
}
}
}
var unraveledBits = new List <bool>(netBits.Count + hostBits.Count);
unraveledBits.AddRange(netBits);
unraveledBits.AddRange(hostBits);
var retBytes = new byte[addressBytes.Length];
for (int i = 0; i < retBytes.Length; ++i)
{
byte b = 0;
for (int bit = 0; bit < 8; ++bit)
{
if (unraveledBits[8 * i + bit])
{
b |= (byte)(1 << (7 - bit));
}
}
retBytes[i] = b;
}
return(address.MaybeFromBytes(retBytes).Value);
}
public static TAddress WeaveAddress <TAddress>(TAddress address, TAddress subnetMask)
where TAddress : struct, IIPAddress <TAddress>
{
if (CalcIPUtils.CidrPrefixFromSubnetMaskBytes(subnetMask.Bytes).HasValue)
{
// nothing to weave :)
return(address);
}
// given an address ABCDEFGH with subnet mask 11001001, convert from subnet mask 11110000 turning it into ABEFCGHD
byte[] addressBytes = address.Bytes;
byte[] maskBytes = subnetMask.Bytes;
int cidrPrefix = subnetMask.Bytes.Sum(b => CalcIPUtils.BytePopCount[b]);
var netBits = new List <bool>(addressBytes.Length);
var hostBits = new List <bool>(addressBytes.Length);
var maskBits = new List <bool>(maskBytes.Length);
// find the bits
for (int i = 0; i < addressBytes.Length; ++i)
{
for (int bit = 0; bit < 8; ++bit)
{
int totalBitIndex = 8 * i + bit;
bool addressBit = ((addressBytes[i] & (1 << (7 - bit))) != 0);
bool isNet = (totalBitIndex < cidrPrefix);
if (isNet)
{
netBits.Add(addressBit);
}
else
{
hostBits.Add(addressBit);
}
bool maskBit = ((maskBytes[i] & (1 << (7 - bit))) != 0);
maskBits.Add(maskBit);
}
}
var retBytes = new byte[addressBytes.Length];
int netIndex = 0;
int hostIndex = 0;
for (int i = 0; i < retBytes.Length; ++i)
{
byte b = 0;
for (int bit = 0; bit < 8; ++bit)
{
bool shouldSetBit;
if (maskBits[8 * i + bit])
{
shouldSetBit = netBits[netIndex];
++netIndex;
}
else
{
shouldSetBit = hostBits[hostIndex];
++hostIndex;
}
if (shouldSetBit)
{
b |= (byte)(1 << (7 - bit));
}
}
retBytes[i] = b;
}
return(address.MaybeFromBytes(retBytes).Value);
}
