[Kernel] XamSwapDisc and supporting functions

src/xenia/app/emulator_window.cc

@@ -40,6 +40,8 @@ using xe::ui::UIEvent;
 
 const std::wstring kBaseTitle = L"xenia";
 
+ui::NativeWindowHandle window_handle;
+
 EmulatorWindow::EmulatorWindow(Emulator* emulator)
     : emulator_(emulator),
       loop_(ui::Loop::Create()),
@@ -316,6 +318,7 @@ void EmulatorWindow::FileOpen() {
       {L"All Files (*.*)", L"*.*"},
   });
   if (file_picker->Show(window_->native_handle())) {
+    window_handle = window_->native_handle();
     auto selected_files = file_picker->selected_files();
     if (!selected_files.empty()) {
       path = selected_files[0];
@@ -334,6 +337,30 @@ void EmulatorWindow::FileOpen() {
   }
 }
 
+std::wstring EmulatorWindow::SwapNext() {
+  std::wstring path = L"";
+
+  auto file_picker = xe::ui::FilePicker::Create();
+  file_picker->set_mode(ui::FilePicker::Mode::kOpen);
+  file_picker->set_type(ui::FilePicker::Type::kFile);
+  file_picker->set_multi_selection(false);
+  file_picker->set_title(L"Select Content Package");
+  file_picker->set_extensions({
+      {L"Supported Files", L"*.iso;*.xex;*.xcp;*.*"},
+      {L"Disc Image (*.iso)", L"*.iso"},
+      {L"Xbox Executable (*.xex)", L"*.xex"},
+      //  { L"Content Package (*.xcp)", L"*.xcp" },
+      {L"All Files (*.*)", L"*.*"},
+  });
+  if (file_picker->Show(window_handle)) {
+    auto selected_files = file_picker->selected_files();
+    if (!selected_files.empty()) {
+      path = selected_files[0];
+    }
+  }
+  return path;
+}
+
 void EmulatorWindow::FileClose() {
   if (emulator_->is_title_open()) {
     emulator_->TerminateTitle();

src/xenia/app/emulator_window.h

@@ -37,6 +37,7 @@ class EmulatorWindow {
 
   void UpdateTitle();
   void ToggleFullscreen();
+  static std::wstring SwapNext();
 
  private:
   explicit EmulatorWindow(Emulator* emulator);

src/xenia/kernel/xam/xam_content.cc

@@ -7,11 +7,20 @@
  ******************************************************************************
  */
 
+#include "xenia/app/emulator_window.h"
 #include "xenia/base/logging.h"
 #include "xenia/kernel/kernel_state.h"
 #include "xenia/kernel/util/shim_utils.h"
+#include "xenia/kernel/xam/xam_module.h"
 #include "xenia/kernel/xam/xam_private.h"
+#include "xenia/kernel/xboxkrnl/xboxkrnl_module.h"
+#include "xenia/kernel/xboxkrnl/xboxkrnl_threading.h"
 #include "xenia/kernel/xenumerator.h"
+#include "xenia/kernel/xevent.h"
+#include "xenia/kernel/xthread.h"
+#include "xenia/vfs/devices/disc_image_device.h"
+#include "xenia/vfs/devices/host_path_device.h"
+#include "xenia/vfs/devices/stfs_container_device.h"
 #include "xenia/xbox.h"
 
 DEFINE_int32(license_mask, 0,
@@ -474,6 +483,74 @@ dword_result_t XamContentDelete(dword_t user_index, lpvoid_t content_data_ptr,
 }
 DECLARE_XAM_EXPORT1(XamContentDelete, kContent, kImplemented);
 
+// Based on Discswap Prototype from Wildenhaus
+// https://github.com/Wildenhaus/xenia/commit/04d2e3951c13fbe4f9574005122d757a2f6e373c
+dword_result_t XamSwapDisc(dword_t disc_number,
+                           pointer_t<kernel::X_KEVENT> completion_handle,
+                           lpstring_t error_message) {
+  auto filesystem = kernel_state()->file_system();
+  auto mount_path = "\\Device\\LauncherData";
+
+  if (filesystem->ResolveDevice(mount_path) != NULL) {
+    filesystem->UnregisterDevice(mount_path);
+  }
+
+  // error_message not correct type/ptr
+  XELOGI("XamSwapDisc requests disc %d.", disc_number);
+  std::wstring local_path = app::EmulatorWindow::SwapNext();
+  XELOGI("SwapNext returned path %S.", local_path.c_str());
+
+  auto last_slash = local_path.find_last_of(xe::kPathSeparator);
+  auto last_dot = local_path.find_last_of('.');
+
+  if (last_dot < last_slash) {
+    last_dot = std::wstring::npos;
+  }
+  if (last_dot == std::wstring::npos) {
+    // Likely an STFS container.
+    auto dev =
+        std::make_unique<vfs::StfsContainerDevice>(mount_path, local_path);
+    dev->Initialize();
+    filesystem->RegisterDevice(std::move(dev));
+  };
+  auto extension = local_path.substr(last_dot);
+  std::transform(extension.begin(), extension.end(), extension.begin(),
+                 tolower);
+  if (extension == L".xex" || extension == L".elf" || extension == L".exe") {
+    // Treat as a naked xex file.
+    auto parent_path = xe::find_base_path(local_path);
+    auto dev =
+        std::make_unique<vfs::HostPathDevice>(mount_path, parent_path, true);
+    dev->Initialize();
+    filesystem->RegisterDevice(std::move(dev));
+  } else {
+    // Assume a disc image.
+    auto dev = std::make_unique<vfs::DiscImageDevice>(mount_path, local_path);
+    dev->Initialize();
+    filesystem->RegisterDevice(std::move(dev));
+  }
+
+  // Register the new device to d: and game:
+  filesystem->UnregisterSymbolicLink("d:");
+  filesystem->UnregisterSymbolicLink("game:");
+  filesystem->RegisterSymbolicLink("d:", mount_path);
+  filesystem->RegisterSymbolicLink("game:", mount_path);
+
+  // Resolve the pending disc swap event
+  auto kevent = xboxkrnl::xeKeSetEvent(completion_handle, 1, 0);
+
+  // Release the completion handle
+  auto object = XObject::GetNativeObject<XObject>(
+      kernel_state(),
+      kernel_memory()->virtual_membase() + (dword_t)completion_handle);
+  if (object) {
+    object->Release();
+  }
+
+  return 0;
+}
+DECLARE_XAM_EXPORT1(XamSwapDisc, kContent, kSketchy);
+
 void RegisterContentExports(xe::cpu::ExportResolver* export_resolver,
                             KernelState* kernel_state) {}
 

src/xenia/vfs/virtual_file_system.cc

@@ -25,6 +25,26 @@ VirtualFileSystem::~VirtualFileSystem() {
   devices_.clear();
   symlinks_.clear();
 }
+Entry* VirtualFileSystem::ResolveDevice(const std::string& devicepath) {
+  auto global_lock = global_critical_region_.Acquire();
+
+  // Resolve relative paths
+  std::string normalized_path(xe::filesystem::CanonicalizePath(devicepath));
+
+  // Find the device.
+  auto it =
+      std::find_if(devices_.cbegin(), devices_.cend(), [&](const auto& d) {
+        return xe::find_first_of_case(normalized_path, d->mount_path()) == 0;
+      });
+  if (it == devices_.cend()) {
+    XELOGE("ResolveDevice(%s) device not initialized", devicepath.c_str());
+    return nullptr;
+  }
+
+  const auto& device = *it;
+  auto relative_path = normalized_path.substr(device->mount_path().size());
+  return device->ResolvePath(relative_path);
+}
 
 bool VirtualFileSystem::RegisterDevice(std::unique_ptr<Device> device) {
   auto global_lock = global_critical_region_.Acquire();

src/xenia/vfs/virtual_file_system.h

@@ -27,6 +27,7 @@ class VirtualFileSystem {
  public:
   VirtualFileSystem();
   ~VirtualFileSystem();
+  Entry* ResolveDevice(const std::string& path);
 
   bool RegisterDevice(std::unique_ptr<Device> device);
   bool UnregisterDevice(const std::string& path);