72 lines
No EOL
2 KiB
C#
72 lines
No EOL
2 KiB
C#
using System.Text;
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namespace lib;
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public static class Utils
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{
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// some print color coding constants for ease of change later
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/// Encrypted stuff
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public const ConsoleColor C_ENC = ConsoleColor.Green;
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/// Non encrypted stuff (either before encryption or after decryption)
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public const ConsoleColor C_DEC = ConsoleColor.Red;
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/// System messages
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public const ConsoleColor C_SYS = ConsoleColor.Yellow;
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public static byte[] NumberToBytes(string Number)
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{
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if (Number.Any(c => !char.IsDigit(c)) || Number.Length > 16)
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{
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throw new Exception("Invalid arguments!");
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}
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byte[] res = Enumerable.Repeat((byte)0b1111_1111, 8).ToArray();
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// Pad Number if needed to be of even length (because each 2 digits are turned into 1 byte)
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Number = Number.Length % 2 == 0 ? Number : Number + '-';
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for (int i = 0; i < Number.Length - 1; i += 2)
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{
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char c1 = Number[i];
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char c2 = Number[i + 1];
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res[i / 2] = (byte)((DigitToByte(c1) << 4) | DigitToByte(c2));
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}
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return res;
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}
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public static string BytesToNumber(byte[] Bytes)
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{
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string s = "";
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foreach (byte b in Bytes)
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{
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byte b1 = (byte)((b >> 4) & 0b1111);
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byte b2 = (byte)(b & 0b1111);
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s = s + ByteToDigit(b1) + ByteToDigit(b2);
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}
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return new string(s.Where(char.IsDigit).ToArray());
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}
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public static byte DigitToByte(char c)
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{
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if (int.TryParse(c.ToString(), out int d))
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{
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return (byte)d;
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}
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else
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{
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return 0b1111; // empty, turned into '-' later to be discarded
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}
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}
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public static char ByteToDigit(byte b)
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{
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byte offset = Encoding.ASCII.GetBytes("0")[0];
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if (b == 0b1111)
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{
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return '-';
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}
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else
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{
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return Encoding.ASCII.GetChars([(byte)(b + offset)])[0];
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}
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}
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} |