Luis Gonzalez
56 lines
1.9 KiB
C#
56 lines
1.9 KiB
C#
using Unity.Collections;
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using Unity.Collections.LowLevel.Unsafe;
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using Unity.Entities;
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using Unity.Mathematics;
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using Hash128 = Unity.Entities.Hash128;
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using FixedStringName = Unity.Collections.FixedString512Bytes;
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////////////////////////////////////////////////////////////////////////////////////
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namespace Rukhanka.Toolbox
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{
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public static class BlobStringExtensions
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{
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public unsafe static Hash128 CalculateHash128(ref this BlobString s)
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{
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var hasher = new xxHash3.StreamingState();
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// BlobString internally is just BlobArray, so do a little C++ magic here and reinterpret BlobString as BlobArray (with hope that first member of former will remain as its data)
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ref var stringAsArr = ref UnsafeUtility.As<BlobString, BlobArray<byte>>(ref s);
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// Ignoring trailing zero byte
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hasher.Update(stringAsArr.GetUnsafePtr(), stringAsArr.Length - 1);
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var rv = new Hash128(hasher.DigestHash128());
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return rv;
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}
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////////////////////////////////////////////////////////////////////////////////////
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public static FixedStringName ToFixedString(ref this BlobString s)
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{
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var rv = new FixedStringName();
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if (s.Length > 0)
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s.CopyTo(ref rv);
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return rv;
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}
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////////////////////////////////////////////////////////////////////////////////////
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// Truncate string if needed
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public static unsafe ConversionError CopyToWithTruncate<T>(ref this BlobString bs, ref T dest) where T : INativeList<byte>
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{
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fixed (BlobString* blobStringPtr = &bs)
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{
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var ba = (BlobArray<byte>*)blobStringPtr;
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byte* srcBuffer = (byte*)ba->GetUnsafePtr();
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int srcLength = bs.Length;
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dest.Length = math.min(srcLength, dest.Capacity);
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byte* destBuffer = (byte*)UnsafeUtility.AddressOf(ref dest.ElementAt(0));
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int destCapacity = dest.Capacity;
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var err = Unicode.Utf8ToUtf8(srcBuffer, srcLength, destBuffer, out var destLength, destCapacity);
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dest.Length = destLength;
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return err;
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}
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}
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}
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}
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