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Runtime/Native.meta

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Runtime/Native/NativeFunctions.cs

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+using System;
+using System.Runtime.InteropServices;
+
+namespace NativeFileDialogSharp.Native
+{
+    public struct nfdpathset_t
+    {
+        public IntPtr buf;
+        public IntPtr indices;
+        public UIntPtr count;
+    }
+
+    public enum nfdresult_t
+    {
+        NFD_ERROR,
+        NFD_OKAY,
+        NFD_CANCEL
+    }
+
+    public static class NativeFunctions
+    {
+        public const string LibraryName = "nfd";
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_OpenDialog(byte* filterList, byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_OpenDialogMultiple(byte* filterList, byte* defaultPath,
+            nfdpathset_t* outPaths);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_SaveDialog(byte* filterList, byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_PickFolder(byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe byte* NFD_GetError();
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe UIntPtr NFD_PathSet_GetCount(nfdpathset_t* pathSet);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe byte* NFD_PathSet_GetPath(nfdpathset_t* pathSet, UIntPtr index);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_PathSet_Free(nfdpathset_t* pathSet);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_Dummy();
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe IntPtr NFD_Malloc(UIntPtr bytes);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_Free(IntPtr ptr);
+    }
+    
+    public static class NativeFunctions32
+    {
+        public const string LibraryName = "nfd_x86";
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_OpenDialog(byte* filterList, byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_OpenDialogMultiple(byte* filterList, byte* defaultPath,
+            nfdpathset_t* outPaths);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_SaveDialog(byte* filterList, byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe nfdresult_t NFD_PickFolder(byte* defaultPath, out IntPtr outPath);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe byte* NFD_GetError();
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe UIntPtr NFD_PathSet_GetCount(nfdpathset_t* pathSet);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe byte* NFD_PathSet_GetPath(nfdpathset_t* pathSet, UIntPtr index);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_PathSet_Free(nfdpathset_t* pathSet);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_Dummy();
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe IntPtr NFD_Malloc(UIntPtr bytes);
+
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl, ExactSpelling = true)]
+        public static extern unsafe void NFD_Free(IntPtr ptr);
+    }
+}

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Runtime/NativeWrappers.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using System.Text;
+using NativeFileDialogSharp.Native;
+
+namespace NativeFileDialogSharp
+{
+    public static class Dialog
+    {
+        private static readonly Encoder utf8encoder = Encoding.UTF8.GetEncoder();
+
+        private static readonly bool need32bit = Is32BitWindowsOnNetFramework();
+        
+        private static bool Is32BitWindowsOnNetFramework()
+        {
+            try
+            {
+                // we call a function that does nothing just to test if we can load it properly
+                NativeFileDialogSharp.Native.NativeFunctions.NFD_Dummy();
+                return false;
+            }
+            catch
+            {
+                // a call to a default library failed, let's attempt the other one
+                try
+                {
+                    NativeFileDialogSharp.Native.NativeFunctions32.NFD_Dummy();
+                    return true;
+                }
+                catch
+                {
+                    // both of them failed so we may as well default to the default one for predictability
+                    return false;
+                }
+            }
+        }
+
+        private static unsafe byte[] ToUtf8(string s)
+        {
+            var byteCount = Encoding.UTF8.GetByteCount(s);
+            var bytes = new byte[byteCount + 1];
+            fixed (byte* o = bytes)
+            fixed (char* input = s)
+            {
+                utf8encoder.Convert(input, s.Length, o, bytes.Length, true, out _, out var _,
+                    out var completed);
+                Debug.Assert(completed);
+            }
+
+            return bytes;
+        }
+
+        private static unsafe int GetNullTerminatedStringLength(byte* nullTerminatedString)
+        {
+            int count = 0;
+            var ptr = nullTerminatedString;
+            while (*ptr != 0)
+            {
+                ptr++;
+                count++;
+            }
+
+            return count;
+        }
+
+        private static unsafe string FromUtf8(byte* nullTerminatedString)
+        {
+            return Encoding.UTF8.GetString(nullTerminatedString, GetNullTerminatedStringLength(nullTerminatedString));
+        }
+
+        public static unsafe DialogResult FileOpen(string filterList = null, string defaultPath = null)
+        {
+            fixed (byte* filterListNts = filterList != null ? ToUtf8(filterList) : null)
+            fixed (byte* defaultPathNts = defaultPath != null ? ToUtf8(defaultPath) : null)
+            {
+                string path = null;
+                string errorMessage = null;
+                IntPtr outPathIntPtr;
+                var result = need32bit 
+                    ? NativeFunctions32.NFD_OpenDialog(filterListNts, defaultPathNts, out outPathIntPtr)
+                    : NativeFunctions.NFD_OpenDialog(filterListNts, defaultPathNts, out outPathIntPtr);
+                if (result == nfdresult_t.NFD_ERROR)
+                {
+                    errorMessage = FromUtf8(NativeFunctions.NFD_GetError());
+                }
+                else if (result == nfdresult_t.NFD_OKAY)
+                {
+                    var outPathNts = (byte*)outPathIntPtr.ToPointer();
+                    path = FromUtf8(outPathNts);
+                    NativeFunctions.NFD_Free(outPathIntPtr);
+                }
+
+                return new DialogResult(result, path, null, errorMessage);
+            }
+        }
+
+        public static unsafe DialogResult FileSave(string filterList = null, string defaultPath = null)
+        {
+            fixed (byte* filterListNts = filterList != null ? ToUtf8(filterList) : null)
+            fixed (byte* defaultPathNts = defaultPath != null ? ToUtf8(defaultPath) : null)
+            {
+                string path = null;
+                string errorMessage = null;
+                IntPtr outPathIntPtr;
+                var result = need32bit 
+                    ? NativeFunctions32.NFD_SaveDialog(filterListNts, defaultPathNts, out outPathIntPtr) 
+                    : NativeFunctions.NFD_SaveDialog(filterListNts, defaultPathNts, out outPathIntPtr);
+                if (result == nfdresult_t.NFD_ERROR)
+                {
+                    errorMessage = FromUtf8(NativeFunctions.NFD_GetError());
+                }
+                else if (result == nfdresult_t.NFD_OKAY)
+                {
+                    var outPathNts = (byte*)outPathIntPtr.ToPointer();
+                    path = FromUtf8(outPathNts);
+                    NativeFunctions.NFD_Free(outPathIntPtr);
+                }
+
+                return new DialogResult(result, path, null, errorMessage);
+            }
+        }
+
+        public static unsafe DialogResult FolderPicker(string defaultPath = null)
+        {
+            fixed (byte* defaultPathNts = defaultPath != null ? ToUtf8(defaultPath) : null)
+            {
+                string path = null;
+                string errorMessage = null;
+                IntPtr outPathIntPtr;
+                var result = need32bit
+                    ? NativeFunctions32.NFD_PickFolder(defaultPathNts, out outPathIntPtr)
+                    : NativeFunctions.NFD_PickFolder(defaultPathNts, out outPathIntPtr);
+                if (result == nfdresult_t.NFD_ERROR)
+                {
+                    errorMessage = FromUtf8(NativeFunctions.NFD_GetError());
+                }
+                else if (result == nfdresult_t.NFD_OKAY)
+                {
+                    var outPathNts = (byte*)outPathIntPtr.ToPointer();
+                    path = FromUtf8(outPathNts);
+                    NativeFunctions.NFD_Free(outPathIntPtr);
+                }
+
+                return new DialogResult(result, path, null, errorMessage);
+            }
+        }
+
+        public static unsafe DialogResult FileOpenMultiple(string filterList = null, string defaultPath = null)
+        {
+            fixed (byte* filterListNts = filterList != null ? ToUtf8(filterList) : null)
+            fixed (byte* defaultPathNts = defaultPath != null ? ToUtf8(defaultPath) : null)
+            {
+                List<string> paths = null;
+                string errorMessage = null;
+                nfdpathset_t pathSet;
+                var result = need32bit
+                    ? NativeFunctions32.NFD_OpenDialogMultiple(filterListNts, defaultPathNts, &pathSet)
+                    : NativeFunctions.NFD_OpenDialogMultiple(filterListNts, defaultPathNts, &pathSet);
+                if (result == nfdresult_t.NFD_ERROR)
+                {
+                    errorMessage = FromUtf8(NativeFunctions.NFD_GetError());
+                }
+                else if (result == nfdresult_t.NFD_OKAY)
+                {
+                    var pathCount = (int)NativeFunctions.NFD_PathSet_GetCount(&pathSet).ToUInt32();
+                    paths = new List<string>(pathCount);
+                    for (int i = 0; i < pathCount; i++)
+                    {
+                        paths.Add(FromUtf8(NativeFunctions.NFD_PathSet_GetPath(&pathSet, new UIntPtr((uint)i))));
+                    }
+
+                    NativeFunctions.NFD_PathSet_Free(&pathSet);
+                }
+
+                return new DialogResult(result, null, paths, errorMessage);
+            }
+        }
+    }
+
+    public class DialogResult
+    {
+        private readonly nfdresult_t result;
+
+        public string Path { get; }
+
+        public IReadOnlyList<string> Paths { get; }
+
+        public bool IsError => result == nfdresult_t.NFD_ERROR;
+
+        public string ErrorMessage { get; }
+
+        public bool IsCancelled => result == nfdresult_t.NFD_CANCEL;
+
+        public bool IsOk => result == nfdresult_t.NFD_OKAY;
+
+        internal DialogResult(nfdresult_t result, string path, IReadOnlyList<string> paths, string errorMessage)
+        {
+            this.result = result;
+            Path = path;
+            Paths = paths;
+            ErrorMessage = errorMessage;
+        }
+    }
+}

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