88 lines
3.0 KiB
C#
88 lines
3.0 KiB
C#
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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namespace Wickra;
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/// <summary>
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/// Native library resolution for the Wickra C ABI.
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/// </summary>
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/// <remarks>
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/// When consumed as a NuGet package the native library ships under
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/// <c>runtimes/<rid>/native/</c> and the default runtime resolver finds it
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/// automatically. For local development (project reference against a cargo build)
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/// the resolver additionally walks up the directory tree to locate
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/// <c>target/release</c> or <c>target/debug</c>. Every candidate is validated to
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/// actually export the Wickra ABI before it is accepted, so an unrelated library
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/// of the same name cannot shadow the real one.
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/// </remarks>
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internal static class WickraNative
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{
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/// <summary>The library name passed to <c>[LibraryImport]</c>.</summary>
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internal const string LibraryName = "wickra";
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// Any exported symbol works as a fingerprint; sma_new exists in every build.
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private const string SentinelSymbol = "wickra_sma_new";
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[ModuleInitializer]
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internal static void Register()
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{
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NativeLibrary.SetDllImportResolver(typeof(WickraNative).Assembly, Resolve);
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}
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private static nint Resolve(string libraryName, System.Reflection.Assembly assembly, DllImportSearchPath? searchPath)
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{
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if (libraryName != LibraryName)
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{
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return nint.Zero;
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}
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// 1. Default resolution (NuGet runtimes/ layout, app-local copies). Accept
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// only if it is genuinely the Wickra ABI; otherwise discard and fall through.
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if (NativeLibrary.TryLoad(libraryName, assembly, searchPath, out var handle))
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{
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if (Exports(handle))
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{
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return handle;
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}
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NativeLibrary.Free(handle);
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}
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// 2. Development fallback: locate the cargo build output.
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var fileName = NativeFileName();
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var dir = AppContext.BaseDirectory;
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for (var i = 0; i < 16 && dir is not null; i++)
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{
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foreach (var profile in new[] { "release", "debug" })
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{
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var candidate = Path.Combine(dir, "target", profile, fileName);
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if (File.Exists(candidate) && NativeLibrary.TryLoad(candidate, out var devHandle))
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{
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if (Exports(devHandle))
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{
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return devHandle;
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}
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NativeLibrary.Free(devHandle);
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}
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}
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dir = Path.GetDirectoryName(dir.TrimEnd(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar));
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}
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return nint.Zero;
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}
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private static bool Exports(nint handle) => NativeLibrary.TryGetExport(handle, SentinelSymbol, out _);
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private static string NativeFileName()
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{
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if (OperatingSystem.IsWindows())
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{
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return "wickra.dll";
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}
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return OperatingSystem.IsMacOS() ? "libwickra.dylib" : "libwickra.so";
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}
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}
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