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@@ -0,0 +1,179 @@
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+using Ryujinx.HLE.HOS.Applets.SoftwareKeyboard;
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+using Ryujinx.HLE.HOS.Services.Am.AppletAE;
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+using System;
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+using System.IO;
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+using System.Runtime.InteropServices;
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+using System.Text;
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+
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+namespace Ryujinx.HLE.HOS.Applets
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+{
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+ internal class SoftwareKeyboardApplet : IApplet
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+ {
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+ private const string DEFAULT_NUMB = "1";
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+ private const string DEFAULT_TEXT = "Ryujinx";
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+
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+ private const int STANDARD_BUFFER_SIZE = 0x7D8;
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+ private const int INTERACTIVE_BUFFER_SIZE = 0x7D4;
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+
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+ private SoftwareKeyboardState _state = SoftwareKeyboardState.Uninitialized;
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+
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+ private AppletSession _normalSession;
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+ private AppletSession _interactiveSession;
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+
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+ private SoftwareKeyboardConfig _keyboardConfig;
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+
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+ private string _textValue = DEFAULT_TEXT;
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+
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+ public event EventHandler AppletStateChanged;
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+
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+ public SoftwareKeyboardApplet(Horizon system) { }
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+
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+ public ResultCode Start(AppletSession normalSession,
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+ AppletSession interactiveSession)
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+ {
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+ _normalSession = normalSession;
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+ _interactiveSession = interactiveSession;
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+
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+ _interactiveSession.DataAvailable += OnInteractiveData;
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+
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+ var launchParams = _normalSession.Pop();
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+ var keyboardConfig = _normalSession.Pop();
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+ var transferMemory = _normalSession.Pop();
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+
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+ _keyboardConfig = ReadStruct<SoftwareKeyboardConfig>(keyboardConfig);
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+
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+ _state = SoftwareKeyboardState.Ready;
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+
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+ Execute();
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+
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+ return ResultCode.Success;
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+ }
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+
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+ public ResultCode GetResult()
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+ {
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+ return ResultCode.Success;
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+ }
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+
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+ private void Execute()
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+ {
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+ // If the keyboard type is numbers only, we swap to a default
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+ // text that only contains numbers.
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+ if (_keyboardConfig.Type == SoftwareKeyboardType.NumbersOnly)
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+ {
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+ _textValue = DEFAULT_NUMB;
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+ }
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+
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+ // If the max string length is 0, we set it to a large default
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+ // length.
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+ if (_keyboardConfig.StringLengthMax == 0)
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+ {
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+ _keyboardConfig.StringLengthMax = 100;
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+ }
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+
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+ // If our default text is longer than the allowed length,
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+ // we truncate it.
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+ if (_textValue.Length > _keyboardConfig.StringLengthMax)
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+ {
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+ _textValue = _textValue.Substring(0, (int)_keyboardConfig.StringLengthMax);
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+ }
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+
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+ if (!_keyboardConfig.CheckText)
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+ {
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+ // If the application doesn't need to validate the response,
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+ // we push the data to the non-interactive output buffer
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+ // and poll it for completion.
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+ _state = SoftwareKeyboardState.Complete;
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+
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+ _normalSession.Push(BuildResponse(_textValue, false));
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+
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+ AppletStateChanged?.Invoke(this, null);
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+ }
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+ else
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+ {
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+ // The application needs to validate the response, so we
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+ // submit it to the interactive output buffer, and poll it
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+ // for validation. Once validated, the application will submit
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+ // back a validation status, which is handled in OnInteractiveDataPushIn.
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+ _state = SoftwareKeyboardState.ValidationPending;
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+
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+ _interactiveSession.Push(BuildResponse(_textValue, true));
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+ }
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+ }
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+
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+ private void OnInteractiveData(object sender, EventArgs e)
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+ {
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+ // Obtain the validation status response,
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+ var data = _interactiveSession.Pop();
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+
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+ if (_state == SoftwareKeyboardState.ValidationPending)
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+ {
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+ // TODO(jduncantor):
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+ // If application rejects our "attempt", submit another attempt,
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+ // and put the applet back in PendingValidation state.
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+
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+ // For now we assume success, so we push the final result
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+ // to the standard output buffer and carry on our merry way.
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+ _normalSession.Push(BuildResponse(_textValue, false));
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+
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+ AppletStateChanged?.Invoke(this, null);
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+
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+ _state = SoftwareKeyboardState.Complete;
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+ }
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+ else if(_state == SoftwareKeyboardState.Complete)
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+ {
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+ // If we have already completed, we push the result text
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+ // back on the output buffer and poll the application.
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+ _normalSession.Push(BuildResponse(_textValue, false));
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+
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+ AppletStateChanged?.Invoke(this, null);
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+ }
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+ else
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+ {
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+ // We shouldn't be able to get here through standard swkbd execution.
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+ throw new InvalidOperationException("Software Keyboard is in an invalid state.");
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+ }
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+ }
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+
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+ private byte[] BuildResponse(string text, bool interactive)
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+ {
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+ int bufferSize = !interactive ? STANDARD_BUFFER_SIZE : INTERACTIVE_BUFFER_SIZE;
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+
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+ using (MemoryStream stream = new MemoryStream(new byte[bufferSize]))
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+ using (BinaryWriter writer = new BinaryWriter(stream))
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+ {
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+ byte[] output = Encoding.Unicode.GetBytes(text);
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+
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+ if (!interactive)
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+ {
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+ // Result Code
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+ writer.Write((uint)0);
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+ }
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+ else
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+ {
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+ // In interactive mode, we write the length of the text
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+ // as a long, rather than a result code.
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+ writer.Write((long)output.Length);
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+ }
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+
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+ writer.Write(output);
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+
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+ return stream.ToArray();
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+ }
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+ }
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+
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+ private static T ReadStruct<T>(byte[] data)
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+ where T : struct
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+ {
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+ GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
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+
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+ try
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+ {
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+ return Marshal.PtrToStructure<T>(handle.AddrOfPinnedObject());
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+ }
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+ finally
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+ {
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+ handle.Free();
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+ }
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+ }
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+ }
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+}
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