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