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* fixed guid generation

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This commit is contained in:
JustFixMe
2024-08-15 19:55:04 +04:00
parent d565c48084
commit d60b94dbaa
2 changed files with 104 additions and 95 deletions
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16
Core/GuidV8.cs
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@@ -13,28 +13,28 @@ public static class GuidV8
[Pure]
public static Guid NewGuid(DateTime dateTime, GuidV8Entropy entropy = GuidV8Entropy.Strong)
{
var timestamp = dateTime.ToBinary() & 0x3FFF_FFFF_FFFF_FFFF;
var epoch = dateTime.Subtract(DateTime.UnixEpoch);
var timestamp = epoch.Ticks / (TimeSpan.TicksPerMillisecond / 10);
Span<byte> ts = stackalloc byte[8];
MemoryMarshal.Write(ts, timestamp);
Span<byte> bytes = stackalloc byte[16];
ts[4..].CopyTo(bytes[..4]);
ts[2..4].CopyTo(bytes[4..6]);
ts[..2].CopyTo(bytes[6..8]);
bytes[7] = (byte)((bytes[7] & 0x0f) | 0x80);
ts[0..2].CopyTo(bytes[4..6]);
ts[2..6].CopyTo(bytes[..4]);
if (entropy == GuidV8Entropy.Strong)
{
RandomNumberGenerator.Fill(bytes[8..]);
RandomNumberGenerator.Fill(bytes[6..]);
}
else
{
Random.Shared.NextBytes(bytes[8..]);
Random.Shared.NextBytes(bytes[6..]);
}
bytes[7] = (byte)((bytes[7] & 0x0F) | 0x80);
return new Guid(bytes);
}
}