63 lines
2.0 KiB
C#
63 lines
2.0 KiB
C#
using System.Buffers.Text;
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using System.Runtime.InteropServices;
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namespace EnotaryoPH.Web.Common.Extensions
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{
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public static class GuidExtensions
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{
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private const char Dash = '-';
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private const char EqualsChar = '=';
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private const byte ForwardSlashByte = (byte)'/';
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private const char Plus = '+';
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private const byte PlusByte = (byte)'+';
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private const char Slash = '/';
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private const char Underscore = '_';
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public static string ToBase64String(this Guid guid)
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{
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Span<byte> guidBytes = stackalloc byte[16];
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Span<byte> encodedBytes = stackalloc byte[24];
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MemoryMarshal.TryWrite(guidBytes, ref guid); // write bytes from the Guid
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Base64.EncodeToUtf8(guidBytes, encodedBytes, out _, out _);
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Span<char> chars = stackalloc char[22];
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// replace any characters which are not URL safe
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// skip the final two bytes as these will be '==' padding we don't need
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for (var i = 0; i < 22; i++)
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{
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chars[i] = encodedBytes[i] switch
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{
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ForwardSlashByte => Dash,
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PlusByte => Underscore,
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_ => (char)encodedBytes[i],
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};
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}
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var final = new string(chars);
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return final;
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}
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public static Guid ToGuidFromString(ReadOnlySpan<char> id)
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{
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Span<char> base64Chars = stackalloc char[24];
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for (var i = 0; i < 22; i++)
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{
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base64Chars[i] = id[i] switch
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{
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'-' => Slash,
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'_' => Plus,
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_ => id[i]
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};
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}
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base64Chars[22] = EqualsChar;
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base64Chars[23] = EqualsChar;
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Span<byte> idBytes = stackalloc byte[16];
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Convert.TryFromBase64Chars(base64Chars, idBytes, out _);
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return new Guid(idBytes);
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}
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}
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} |