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Write a NativeArray to a stream without a temporary, managed array
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| // Copyright 2021 Andreas Atteneder | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // http://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, software | |
| // distributed under the License is distributed on an "AS IS" BASIS, | |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| // See the License for the specific language governing permissions and | |
| // limitations under the License. | |
| // | |
| // Unity 2022 LTS and newer provide an implicit cast from NativeArray to ReadOnlySpan, removing the need for this entirely. | |
| #if !UNITY_2022_2_OR_NEWER | |
| using System; | |
| using System.IO; | |
| using Unity.Collections; | |
| using Unity.Collections.LowLevel.Unsafe; | |
| using UnityEngine; | |
| public static class StreamExtension { | |
| public static unsafe void Write(this Stream stream, NativeArray<byte> array) { | |
| var span = new ReadOnlySpan<byte>(array.GetUnsafeReadOnlyPtr(), array.Length); | |
| stream.Write(span); | |
| } | |
| } | |
| #endif |
@dw8869 Thanks for pointing this one out!
I've found ways to improve on it still:
- use
array.AsReadOnlySpan() - Remove the extension method altogether, since Unity 2022 and newer support implicit cast to ReadOnlySpan like so:
public static implicit operator ReadOnlySpan<T>(in NativeArray<T> source)Meaning you can just do this:
NativeArray<byte> array;
Stream buffer;
buffer.Write(array);So if you're using 2022 LTS or newer, skip this Gist. For the rest I'll update it soon.
Thanks
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Use
array.AsSpan();