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using System.Collections;
using System.Collections.Generic;
using System.Numerics;
namespace System.Net
{
public class IPNetworkCollection : IEnumerable<IPNetwork>, IEnumerator<IPNetwork>
{
private BigInteger _enumerator;
private byte _cidrSubnet;
private IPNetwork _ipnetwork;
private byte _cidr => this._ipnetwork.Cidr;
private BigInteger _broadcast => IPNetwork.ToBigInteger(this._ipnetwork.Broadcast);
private BigInteger _lastUsable => IPNetwork.ToBigInteger(this._ipnetwork.LastUsable);
private BigInteger _network => IPNetwork.ToBigInteger(this._ipnetwork.Network);
#if TRAVISCI
public
#else
internal
#endif
IPNetworkCollection(IPNetwork ipnetwork, byte cidrSubnet)
{
int maxCidr = ipnetwork.AddressFamily == Sockets.AddressFamily.InterNetwork ? 32 : 128;
if (cidrSubnet > maxCidr)
{
throw new ArgumentOutOfRangeException(nameof(cidrSubnet));
}
if (cidrSubnet < ipnetwork.Cidr)
{
throw new ArgumentException("cidr");
}
this._cidrSubnet = cidrSubnet;
this._ipnetwork = ipnetwork;
this._enumerator = -1;
}
#region Count, Array, Enumerator
public BigInteger Count
{
get
{
var count = BigInteger.Pow(2, this._cidrSubnet - this._cidr);
return count;
}
}
public IPNetwork this[BigInteger i]
{
get
{
if (i >= this.Count)
{
throw new ArgumentOutOfRangeException(nameof(i));
}
var last = this._ipnetwork.AddressFamily == Sockets.AddressFamily.InterNetworkV6
? this._lastUsable : this._broadcast;
var increment = (last - this._network) / this.Count;
var uintNetwork = this._network + ((increment + 1) * i);
var ipn = new IPNetwork(uintNetwork, this._ipnetwork.AddressFamily, this._cidrSubnet);
return ipn;
}
}
#endregion
#region IEnumerable Members
IEnumerator<IPNetwork> IEnumerable<IPNetwork>.GetEnumerator()
{
return this;
}
IEnumerator IEnumerable.GetEnumerator()
{
return this;
}
#region IEnumerator<IPNetwork> Members
public IPNetwork Current => this[this._enumerator];
#endregion
#region IDisposable Members
public void Dispose()
{
// nothing to dispose
return;
}
#endregion
#region IEnumerator Members
object IEnumerator.Current => this.Current;
public bool MoveNext()
{
this._enumerator++;
if (this._enumerator >= this.Count)
{
return false;
}
return true;
}
public void Reset()
{
this._enumerator = -1;
}
#endregion
#endregion
}
}
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