54d2fe5773
* Replace instances of Exception with better ones in reflection utils. * Replace instances of Exception with better ones in the websocket project. * Finish replacing generic exceptions. * Tiny tweak to reflection utils for consistency with the .NET library.
37 lines
1.0 KiB
C#
37 lines
1.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Discord.Rest
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{
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internal class HexConverter
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{
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public static byte[] HexToByteArray(string hex)
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{
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if (hex.Length % 2 == 1)
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throw new ArgumentException("The binary key cannot have an odd number of digits");
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byte[] arr = new byte[hex.Length >> 1];
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for (int i = 0; i < hex.Length >> 1; ++i)
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{
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arr[i] = (byte)((GetHexVal(hex[i << 1]) << 4) + (GetHexVal(hex[(i << 1) + 1])));
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}
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return arr;
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}
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private static int GetHexVal(char hex)
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{
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int val = (int)hex;
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//For uppercase A-F letters:
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//return val - (val < 58 ? 48 : 55);
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//For lowercase a-f letters:
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//return val - (val < 58 ? 48 : 87);
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//Or the two combined, but a bit slower:
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return val - (val < 58 ? 48 : (val < 97 ? 55 : 87));
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}
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}
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}
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