Reuse the IOS code for WAD installation

* Less code and logic duplication.

* Fixes a bug with the data dir not being created, steps being done in
  the wrong order.

Source/Core/UICommon/CMakeLists.txt

@@ -3,6 +3,7 @@ set(SRCS
   Disassembler.cpp
   UICommon.cpp
   USBUtils.cpp
+  WiiUtils.cpp
 )
 
 if(USE_X11)

Source/Core/UICommon/UICommon.vcxproj

@@ -59,12 +59,14 @@
     <ClCompile Include="USBUtils.cpp">
       <DisableSpecificWarnings>4200;%(DisableSpecificWarnings)</DisableSpecificWarnings>
     </ClCompile>
+    <ClCompile Include="WiiUtils.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="CommandLineParse.h" />
     <ClInclude Include="UICommon.h" />
     <ClInclude Include="Disassembler.h" />
     <ClInclude Include="USBUtils.h" />
+    <ClInclude Include="WiiUtils.h" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(ExternalsDir)cpp-optparse\cpp-optparse.vcxproj">
@@ -74,4 +76,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

Source/Core/UICommon/WiiUtils.cpp

@@ -0,0 +1,64 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "UICommon/WiiUtils.h"
+#include "Common/CommonTypes.h"
+#include "Common/MsgHandler.h"
+#include "Core/IOS/ES/ES.h"
+#include "Core/IOS/ES/Formats.h"
+#include "Core/IOS/IOS.h"
+#include "DiscIO/NANDContentLoader.h"
+#include "DiscIO/WiiWad.h"
+
+namespace WiiUtils
+{
+bool InstallWAD(const std::string& wad_path)
+{
+  const DiscIO::WiiWAD wad{wad_path};
+  if (!wad.IsValid())
+  {
+    PanicAlertT("WAD installation failed: The selected file is not a valid WAD.");
+    return false;
+  }
+
+  const auto tmd = wad.GetTMD();
+  IOS::HLE::Kernel ios;
+  const auto es = ios.GetES();
+
+  IOS::HLE::Device::ES::Context context;
+  if (es->ImportTicket(wad.GetTicket().GetRawTicket()) < 0 ||
+      es->ImportTitleInit(context, tmd.GetRawTMD()) < 0)
+  {
+    PanicAlertT("WAD installation failed: Could not initialise title import.");
+    return false;
+  }
+
+  const bool contents_imported = [&]() {
+    const u64 title_id = tmd.GetTitleId();
+    for (const IOS::ES::Content& content : tmd.GetContents())
+    {
+      const std::vector<u8> data = wad.GetContent(content.index);
+
+      if (es->ImportContentBegin(context, title_id, content.id) < 0 ||
+          es->ImportContentData(context, 0, data.data(), static_cast<u32>(data.size())) < 0 ||
+          es->ImportContentEnd(context, 0) < 0)
+      {
+        PanicAlertT("WAD installation failed: Could not import content %08x.", content.id);
+        return false;
+      }
+    }
+    return true;
+  }();
+
+  if ((contents_imported && es->ImportTitleDone(context) < 0) ||
+      (!contents_imported && es->ImportTitleCancel(context) < 0))
+  {
+    PanicAlertT("WAD installation failed: Could not finalise title import.");
+    return false;
+  }
+
+  DiscIO::CNANDContentManager::Access().ClearCache();
+  return true;
+}
+}

Source/Core/UICommon/WiiUtils.h

@@ -0,0 +1,14 @@
+// Copyright 2017 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <string>
+
+// Small utility functions for common Wii related tasks.
+
+namespace WiiUtils
+{
+bool InstallWAD(const std::string& wad_path);
+}