67 lines
1.8 KiB
C#
67 lines
1.8 KiB
C#
using System;
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using System.Text;
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using System.Threading;
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namespace NzbDrone.Common
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{
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public static class HashUtil
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{
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//This should never be changed. very bad things will happen!
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private static readonly DateTime Epoch = new DateTime(2010, 1, 1);
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private static readonly object _lock = new object();
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public static string CalculateCrc(string input)
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{
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uint mCrc = 0xffffffff;
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byte[] bytes = Encoding.UTF8.GetBytes(input);
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foreach (byte myByte in bytes)
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{
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mCrc ^= ((uint)(myByte) << 24);
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for (var i = 0; i < 8; i++)
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{
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if ((Convert.ToUInt32(mCrc) & 0x80000000) == 0x80000000)
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{
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mCrc = (mCrc << 1) ^ 0x04C11DB7;
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}
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else
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{
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mCrc <<= 1;
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}
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}
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}
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return String.Format("{0:x8}", mCrc);
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}
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public static string GenerateCommandId()
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{
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return GenerateId("c");
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}
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private static string GenerateId(string prefix)
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{
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lock (_lock)
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{
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Thread.Sleep(1);
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var tick = (DateTime.Now - Epoch).Ticks;
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return prefix + "." + ToBase(tick);
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}
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}
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private static string ToBase(long input)
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{
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const string BASE_CHARS = "0123456789abcdefghijklmnopqrstuvwxyz";
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int targetBase = BASE_CHARS.Length;
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var result = new StringBuilder();
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do
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{
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result.Append(BASE_CHARS[(int)(input % targetBase)]);
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input /= targetBase;
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} while (input > 0);
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return result.ToString();
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}
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}
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} |