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https://github.com/oliverbooth/VpSharp
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Reduce allocations in MarshalManagedToNative
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@ -1,4 +1,4 @@
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using System.Runtime.InteropServices;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Text;
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namespace VpSharp.Internal;
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namespace VpSharp.Internal;
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@ -26,13 +26,19 @@ internal sealed class Utf8StringToNative : ICustomMarshaler
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return -1;
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return -1;
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}
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}
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public nint MarshalManagedToNative(object managedObj)
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public unsafe nint MarshalManagedToNative(object managedObj)
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{
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{
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byte[] utf8Data = Encoding.UTF8.GetBytes((string)managedObj);
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var managedString = (string)managedObj;
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nint buffer = Marshal.AllocHGlobal(utf8Data.Length + 1);
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Span<byte> utf8Bytes = stackalloc byte[managedString.Length];
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Marshal.Copy(utf8Data, 0, buffer, utf8Data.Length);
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Encoding.UTF8.GetBytes(managedString, utf8Bytes);
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Marshal.WriteByte(buffer, utf8Data.Length, 0);
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return buffer;
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fixed (byte* data = &MemoryMarshal.GetReference(utf8Bytes))
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{
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IntPtr buffer = Marshal.AllocHGlobal(utf8Bytes.Length + 1);
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Buffer.MemoryCopy(data, (void*)buffer, utf8Bytes.Length, utf8Bytes.Length);
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Marshal.WriteByte(buffer, utf8Bytes.Length, 0);
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return buffer;
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}
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}
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}
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public object MarshalNativeToManaged(nint pNativeData)
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public object MarshalNativeToManaged(nint pNativeData)
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