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fix: Adds reset RNG command (#1201)

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Kamron Batman 2022-10-22 14:46:23 -07:00 • committed by GitHub
parent 28040582bc
commit 24e2696510
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 30 additions and 3 deletions
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13
Projects/Server/Random/Xoshiro256PlusPlus.cs
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@ -14,6 +14,7 @@
*************************************************************************/ *************************************************************************/
using System; using System;
using System.Buffers.Binary;
using System.Runtime.CompilerServices; using System.Runtime.CompilerServices;
namespace Server.Random; namespace Server.Random;
@ -28,14 +29,20 @@ public class Xoshiro256PlusPlus : BaseRandomSource
private ulong _s0, _s1, _s2, _s3; private ulong _s0, _s1, _s2, _s3;
public Xoshiro256PlusPlus() : this((ulong)Environment.TickCount64) public Xoshiro256PlusPlus()
{ {
Span<byte> states = stackalloc byte[32];
RandomSources.SecureSource.NextBytes(states);
_s0 = BinaryPrimitives.ReadUInt64LittleEndian(states[..8]);
_s1 = BinaryPrimitives.ReadUInt64LittleEndian(states[8..16]);
_s2 = BinaryPrimitives.ReadUInt64LittleEndian(states[16..24]);
_s3 = BinaryPrimitives.ReadUInt64LittleEndian(states[24..32]);
} }
public Xoshiro256PlusPlus(ulong seed) public Xoshiro256PlusPlus(ulong seed)
{ {
var mix = new SplitMix64(seed); var mix = new SplitMix64(seed);
var state = new ulong[4]; Span<ulong> state = stackalloc ulong[4];
mix.FillArray(state); mix.FillArray(state);
_s0 = state[0]; _s0 = state[0];
_s1 = state[1]; _s1 = state[1];
@ -205,7 +212,7 @@ public class SplitMix64
} }
[MethodImpl(MethodImplOptions.AggressiveInlining)] [MethodImpl(MethodImplOptions.AggressiveInlining)]
public void FillArray(ulong[] arr) public void FillArray(Span<ulong> arr)
{ {
for (var i = 0; i < arr.Length; i++) for (var i = 0; i < arr.Length; i++)
{ {

20
Projects/UOContent/Commands/ResetRng.cs Normal file
View file

@ -0,0 +1,20 @@
using Server.Random;
namespace Server.Commands;
public class ResetRng
{
public static void Initialize()
{
CommandSystem.Register("RestRng", AccessLevel.Administrator, ResetRng_OnCommand);
}
[Usage("RestRng")]
[Description(
"Resets the global RNG. Use with care! Do not reset often as this will affect the over-all distribution."
)]
private static void ResetRng_OnCommand(CommandEventArgs e)
{
RandomSources.SetRng(new Xoshiro256PlusPlus());
}
}