public static byte[] ShiftBitsRight([NotNull] this byte[] input,
int shiftCount,
out byte[] carry)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
var bytes = ByteArrayUtilities.CreateFilledByteArray(input.Length, 0x00);
carry = input.GetBits(input.Length * 8 - shiftCount, shiftCount); // fill carry bits
var bitWriteIndex = shiftCount;
for (var bitReadIndex = 0; bitReadIndex < bytes.Length * 8 - shiftCount; bitReadIndex++, bitWriteIndex++)
{
var bitMask = (byte)(0x80 >> bitReadIndex % 8); // bit mask built from current bit position in byte
if ((input[bitReadIndex / 8] & bitMask) > 0) // bit is set
{
bytes[bitWriteIndex / 8] |= (byte)(0x80 >> bitWriteIndex % 8);
}
}
return(bytes);
}
/// <exception cref="ArgumentException">Routing prefix is out of range</exception>
private void InitSubnetFromIPAndRoute([NotNull] IPAddress ipAddress,
[CanBeNull] int?routingPrefix)
{
if (ipAddress == null)
{
throw new ArgumentNullException(nameof(ipAddress));
}
// determine address type
var isIPv4 = ipAddress.AddressFamily == AddressFamily.InterNetwork;
var isIPv6 = ipAddress.AddressFamily == AddressFamily.InterNetworkV6;
if (!isIPv4 &&
!isIPv6)
{
throw new ArgumentException("IP Address must be IPv4 or IPv6", nameof(ipAddress));
}
this.RoutingPrefix = routingPrefix ?? (isIPv4
? IPv4BitCount
: IPv6BitCount); // assign routing prefix
// validate routing prefix
if (this.RoutingPrefix < 0 ||
(isIPv4 && this.RoutingPrefix > IPv4BitCount) ||
(isIPv6 && this.RoutingPrefix > IPv6BitCount))
{
throw new ArgumentException("Routing prefix is out of range", nameof(routingPrefix));
}
var addressBytes = ipAddress.GetAddressBytes(); // get the byte of the ip address
var addressByteLength = addressBytes.Length * 8; // get the number of bytes in the address
// calculate net mask
var netmaskBytes = ByteArrayUtilities.CreateFilledByteArray(isIPv6
? 16
: 4)
.ShiftBitsLeft(addressByteLength - this.RoutingPrefix);
this.Netmask = new IPAddress(netmaskBytes); // assign net mask as ip address
var networkBytes = addressBytes.BitwiseAnd(netmaskBytes);
this.NetworkPrefixAddress = new IPAddress(networkBytes);
var broadcastBytes = addressBytes.BitwiseOr(netmaskBytes.BitwiseNot());
this.BroadcastAddress = new IPAddress(broadcastBytes);
this._length = BigInteger.Pow(2, (isIPv4
? IPv4BitCount
: IPv6BitCount) - this.RoutingPrefix);
}
public static byte[] BitwiseNot([NotNull] this byte[] input)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
var result = ByteArrayUtilities.CreateFilledByteArray(input.Length, 0x00);
for (var i = 0; i < input.Length; i++)
{
result[i] = (byte)~input[i];
}
return(result);
}
public static byte[] GetBits([NotNull] this byte[] sourceBytes,
int start,
int?length = null)
{
if (sourceBytes == null)
{
throw new ArgumentNullException(nameof(sourceBytes));
}
var sourceBitLength = sourceBytes.Length * 8; // the total number of bits in the source
var readLength = length ?? sourceBitLength - start; // the length of bits that will be read
if (readLength > sourceBitLength)
{
throw new InvalidOperationException("can't capture more bits than present");
}
var writeBytesLength = (int)System.Math.Ceiling((double)readLength / 8); // the length of the writable bytes
var writeBytes = ByteArrayUtilities.CreateFilledByteArray(writeBytesLength, 0x00); // destination array
var destinationBitIndex = 0; // the bit index of the destination
for (var i = 0; i < readLength; i++, destinationBitIndex++)
{
var sourceBitIndex = start + readLength - 1 - i; // bit index of the source
var bitMask = (byte)(0x80 >> sourceBitIndex % 8); // bit mask built from current bit position in byte
if ((sourceBytes[sourceBitIndex / 8] & bitMask) > 0) // bit is set
{
writeBytes[destinationBitIndex / 8] |= (byte)(0x01 << destinationBitIndex % 8);
}
}
return(writeBytes.Reverse()
.ToArray());
}
public byte[] CreateFilledArrayDefaultsTo0xFF(int size) => ByteArrayUtilities.CreateFilledByteArray(size);
public byte[] CreateFilledArrayTests(int size, byte intializer)//TODO: test necessary? => ByteArrayUtilities.CreateFilledByteArray(size, intializer);