116 lines
3.6 KiB
C#
116 lines
3.6 KiB
C#
using System;
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using System.Diagnostics;
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using System.Text;
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namespace DnDns
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{
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internal static class DnsHelpers
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{
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private const long Epoch = 621355968000000000;
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internal static byte[] CanonicaliseDnsName(string name, bool lowerCase)
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{
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if (!name.EndsWith("."))
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{
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name += ".";
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}
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if (name == ".")
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{
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return new byte[1];
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}
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StringBuilder sb = new StringBuilder();
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sb.Append('\0');
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for (int i = 0, j = 0; i < name.Length; i++, j++)
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{
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if (lowerCase)
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{
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sb.Append(char.ToLower(name[i]));
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}
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else
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{
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sb.Append(name[i]);
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}
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if (name[i] == '.')
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{
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sb[i - j] = (char) (j & 0xff);
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j = -1;
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}
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}
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sb[sb.Length - 1] = '\0';
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return Encoding.ASCII.GetBytes(sb.ToString());
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}
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internal static String DumpArrayToString(byte[] bytes)
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{
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StringBuilder builder = new StringBuilder();
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builder.Append("[");
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foreach (byte b in bytes)
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{
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builder.Append(" ");
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builder.Append((sbyte)b);
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builder.Append(" ");
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}
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builder.Append("]");
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return builder.ToString();
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}
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/// <summary>
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/// Converts a instance of a <see cref="DateTime"/> class to a 48 bit format time since epoch.
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/// Epoch is defined as 1-Jan-70 UTC.
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/// </summary>
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/// <param name="dateTimeToConvert">The <see cref="DateTime"/> instance to convert to DNS format.</param>
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/// <param name="timeHigh">The upper 16 bits of time.</param>
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/// <param name="timeLow">The lower 32 bits of the time object.</param>
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internal static void ConvertToDnsTime(DateTime dateTimeToConvert, out int timeHigh, out long timeLow)
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{
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long secondsFromEpoch = (dateTimeToConvert.ToUniversalTime().Ticks - Epoch) / 10000000;
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timeHigh = (int)(secondsFromEpoch >> 32);
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timeLow = (secondsFromEpoch & 0xFFFFFFFFL);
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Console.WriteLine(String.Format("Date: {0}", dateTimeToConvert));
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Console.WriteLine(String.Format("secondsFromEpoch: {0}", secondsFromEpoch));
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Console.WriteLine(String.Format("timeHigh: {0}", timeHigh));
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Console.WriteLine(String.Format("timeLow: {0}", timeLow));
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}
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/// <summary>
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/// Convert from DNS 48 but time format to a <see cref="DateTime"/> instance.
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/// </summary>
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/// <param name="timeHigh">The upper 16 bits of time.</param>
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/// <param name="timeLow">The lower 32 bits of the time object.</param>
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/// <returns>The converted date time</returns>
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internal static DateTime ConvertFromDnsTime(long timeLow, long timeHigh)
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{
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long time = (timeHigh << 32) + timeLow;
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time = time*10000000;
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time += Epoch;
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return new DateTime(time);
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}
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/// <summary>
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/// Convert from DNS 48 but time format to a <see cref="DateTime"/> instance.
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/// </summary>
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/// <param name="dnsTime">The upper 48 bits of time.</param>
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/// <returns>The converted date time</returns>
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internal static DateTime ConvertFromDnsTime(long dnsTime)
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{
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dnsTime = dnsTime * 10000000;
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dnsTime += Epoch;
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return new DateTime(dnsTime);
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}
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}
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}
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