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122 lines
3.7 KiB
122 lines
3.7 KiB
//*******************************
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// Created By Rocher Kong
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// Github https://github.com/RocherKong
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// Date 2018.02.09
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//*******************************
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using System;
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namespace IP2Region
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{
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public class IPInValidException : Exception
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{
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const string ERROR_MSG = "IP Illigel. Please input a valid IP.";
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public IPInValidException() : base(ERROR_MSG) { }
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}
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internal static class Utils
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{
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/// <summary>
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/// Write specfield bytes to a byte array start from offset.
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/// </summary>
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public static void Write(byte[] b, int offset, ulong v, int bytes)
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{
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for (int i = 0; i < bytes; i++)
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{
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b[offset++] = (byte)((v >> (8 * i)) & 0xFF);
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}
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}
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/// <summary>
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/// Write a int to a byte array.
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/// </summary>
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public static void WriteIntLong(byte[] b, int offset, long v)
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{
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b[offset++] = (byte)((v >> 0) & 0xFF);
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b[offset++] = (byte)((v >> 8) & 0xFF);
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b[offset++] = (byte)((v >> 16) & 0xFF);
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b[offset] = (byte)((v >> 24) & 0xFF);
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}
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/// <summary>
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/// Get a int from a byte array start from the specifiled offset.
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/// </summary>
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public static long GetIntLong(byte[] b, int offset)
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{
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return (
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((b[offset++] & 0x000000FFL)) |
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((b[offset++] << 8) & 0x0000FF00L) |
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((b[offset++] << 16) & 0x00FF0000L) |
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((b[offset] << 24) & 0xFF000000L)
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);
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}
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/// <summary>
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/// Get a int from a byte array start from the specifield offset.
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/// </summary>
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public static int GetInt3(byte[] b, int offset)
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{
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return (
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(b[offset++] & 0x000000FF) |
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(b[offset++] & 0x0000FF00) |
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(b[offset] & 0x00FF0000)
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);
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}
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public static int GetInt2(byte[] b, int offset)
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{
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return (
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(b[offset++] & 0x000000FF) |
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(b[offset] & 0x0000FF00)
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);
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}
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public static int GetInt1(byte[] b, int offset)
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{
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return (
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(b[offset] & 0x000000FF)
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);
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}
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/// <summary>
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/// String ip to long ip.
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/// </summary>
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public static long Ip2long(string ip)
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{
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string[] p = ip.Split('.');
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if (p.Length != 4) throw new IPInValidException();
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foreach (string pp in p)
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{
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if (pp.Length > 3) throw new IPInValidException();
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if (!int.TryParse(pp, out int value) || value > 255)
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{
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throw new IPInValidException();
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}
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}
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var bip1 = long.TryParse(p[0], out long ip1);
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var bip2 = long.TryParse(p[1], out long ip2);
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var bip3 = long.TryParse(p[2], out long ip3);
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var bip4 = long.TryParse(p[3], out long ip4);
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if (!bip1 || !bip2 || !bip3 || !bip4
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|| ip4 > 255 || ip1 > 255 || ip2 > 255 || ip3 > 255
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|| ip4 < 0 || ip1 < 0 || ip2 < 0 || ip3 < 0)
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{
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throw new IPInValidException();
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}
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long p1 = ((ip1 << 24) & 0xFF000000);
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long p2 = ((ip2 << 16) & 0x00FF0000);
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long p3 = ((ip3 << 8) & 0x0000FF00);
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long p4 = ((ip4 << 0) & 0x000000FF);
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return ((p1 | p2 | p3 | p4) & 0xFFFFFFFFL);
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}
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/// <summary>
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/// Int to ip string.
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/// </summary>
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public static string Long2ip(long ip)
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{
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return $"{(ip >> 24) & 0xFF}.{(ip >> 16) & 0xFF}.{(ip >> 8) & 0xFF}.{ip & 0xFF}";
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}
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}
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}
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