149 lines
3.8 KiB
C#
149 lines
3.8 KiB
C#
using System;
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namespace IP2RegionDotNetDbMaker
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{
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/**
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* util class
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*
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* @author chenxin<chenxin619315@gmail.com>
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*/
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public class Util
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{
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/**
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* write specfield bytes to a byte array start from offset
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*
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* @param b
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* @param offset
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* @param v
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* @param bytes
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*/
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public static void write(byte[] b, int offset, long 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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/**
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* write a int to a byte array
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*
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* @param b
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* @param offet
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* @param v
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*/
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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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/**
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* get a int from a byte array start from the specifiled offset
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*
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* @param b
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* @param offset
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*/
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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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/**
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* get a int from a byte array start from the specifield offset
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*
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* @param b
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* @param offset
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*/
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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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/**
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* string ip to long ip
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*
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* @param ip
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* @return long
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*/
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public static long ip2long(String ip)
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{
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ip = ip.Trim();
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String[] ips = ip.Split('.');
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long ip1 = Int64.Parse(ips[0]);
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long ip2 = Int64.Parse(ips[1]);
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long ip3 = Int64.Parse(ips[2]);
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long ip4 = Int64.Parse(ips[3]);
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long ip2long = 1L * ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4;
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return ip2long;
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}
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/**
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* int to ip string
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*
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* @param ip
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* @return string
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*/
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public static String long2ip(long ip)
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{
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StringBuilder sb = new StringBuilder();
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sb
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.append((ip >> 24) & 0xFF).append('.')
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.append((ip >> 16) & 0xFF).append('.')
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.append((ip >> 8) & 0xFF).append('.')
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.append((ip >> 0) & 0xFF);
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return sb.toString();
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}
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/**
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* check the validate of the specifeld ip address
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*
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* @param ip
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* @return boolean
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*/
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public static bool isIpAddress(String ip)
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{
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String[] p = ip.split(".");
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if (p.Length != 4) return false;
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foreach (var pp in p)
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{
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if (pp.Length > 3) return false;
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var val = Int32.Parse(pp);
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if (val > 255) return false;
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}
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return true;
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}
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}
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}
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