using System;
namespace TEAMModelOS.SDK.IP2Region
{
public class IPInValidException : Exception
{
const string ERROR_MSG = "IP Illigel. Please input a valid IP.";
public IPInValidException() : base(ERROR_MSG) { }
}
internal static class Utils
{
///
/// Write specfield bytes to a byte array start from offset.
///
public static void Write(byte[] b, int offset, ulong v, int bytes)
{
for (int i = 0; i < bytes; i++)
{
b[offset++] = (byte)((v >> (8 * i)) & 0xFF);
}
}
///
/// Write a int to a byte array.
///
public static void WriteIntLong(byte[] b, int offset, long v)
{
b[offset++] = (byte)((v >> 0) & 0xFF);
b[offset++] = (byte)((v >> 8) & 0xFF);
b[offset++] = (byte)((v >> 16) & 0xFF);
b[offset] = (byte)((v >> 24) & 0xFF);
}
///
/// Get a int from a byte array start from the specifiled offset.
///
public static long GetIntLong(byte[] b, int offset)
{
return (
((b[offset++] & 0x000000FFL)) |
((b[offset++] << 8) & 0x0000FF00L) |
((b[offset++] << 16) & 0x00FF0000L) |
((b[offset] << 24) & 0xFF000000L)
);
}
///
/// Get a int from a byte array start from the specifield offset.
///
public static int GetInt3(byte[] b, int offset)
{
return (
(b[offset++] & 0x000000FF) |
(b[offset++] & 0x0000FF00) |
(b[offset] & 0x00FF0000)
);
}
public static int GetInt2(byte[] b, int offset)
{
return (
(b[offset++] & 0x000000FF) |
(b[offset] & 0x0000FF00)
);
}
public static int GetInt1(byte[] b, int offset)
{
return (
(b[offset] & 0x000000FF)
);
}
///
/// String ip to long ip.
///
public static long Ip2long(string ip)
{
string[] p = ip.Split('.');
if (p.Length != 4) throw new IPInValidException();
foreach (string pp in p)
{
if (pp.Length > 3) throw new IPInValidException();
if (!int.TryParse(pp, out int value) || value > 255)
{
throw new IPInValidException();
}
}
var bip1 = long.TryParse(p[0], out long ip1);
var bip2 = long.TryParse(p[1], out long ip2);
var bip3 = long.TryParse(p[2], out long ip3);
var bip4 = long.TryParse(p[3], out long ip4);
if (!bip1 || !bip2 || !bip3 || !bip4
|| ip4 > 255 || ip1 > 255 || ip2 > 255 || ip3 > 255
|| ip4 < 0 || ip1 < 0 || ip2 < 0 || ip3 < 0)
{
throw new IPInValidException();
}
long p1 = ((ip1 << 24) & 0xFF000000);
long p2 = ((ip2 << 16) & 0x00FF0000);
long p3 = ((ip3 << 8) & 0x0000FF00);
long p4 = ((ip4 << 0) & 0x000000FF);
return ((p1 | p2 | p3 | p4) & 0xFFFFFFFFL);
}
///
/// Int to ip string.
///
public static string Long2ip(long ip)
{
return $"{(ip >> 24) & 0xFF}.{(ip >> 16) & 0xFF}.{(ip >> 8) & 0xFF}.{ip & 0xFF}";
}
}
}