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https://github.com/oliverbooth/VpSharp
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stackalloc sufficient length for byte span
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parent
0c0866f54e
commit
20e5eebf47
@ -5,6 +5,7 @@ namespace VpSharp.Internal;
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internal sealed class Utf8StringToNative : ICustomMarshaler
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{
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private static readonly Encoding Utf8Encoding = Encoding.UTF8;
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private static Utf8StringToNative? s_instance;
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public static ICustomMarshaler GetInstance(string cookie)
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@ -29,14 +30,15 @@ internal sealed class Utf8StringToNative : ICustomMarshaler
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public unsafe nint MarshalManagedToNative(object managedObj)
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{
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var managedString = (string)managedObj;
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Span<byte> utf8Bytes = stackalloc byte[managedString.Length];
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Encoding.UTF8.GetBytes(managedString, utf8Bytes);
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int byteCount = Utf8Encoding.GetByteCount(managedString);
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Span<byte> utf8Bytes = stackalloc byte[byteCount];
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Utf8Encoding.GetBytes(managedString, utf8Bytes);
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fixed (byte* data = &MemoryMarshal.GetReference(utf8Bytes))
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{
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nint 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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nint buffer = Marshal.AllocHGlobal(byteCount + 1);
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Buffer.MemoryCopy(data, (void*)buffer, byteCount, byteCount);
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Marshal.WriteByte(buffer, byteCount, 0);
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return buffer;
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}
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}
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