Move DiscIO enums to a new file

At first there weren't many enums in Volume.h, but the number has been
growing, and I'm planning to add one more for regions. To not make
Volume.h too large, and to avoid needing to include Volume.h in code
that doesn't use volume objects, I'm moving the enums to a new file.
I'm also turning them into enum classes while I'm at it.

Source/Core/DiscIO/Volume.cpp

@@ -0,0 +1,77 @@
+// Copyright 2009 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <algorithm>
+#include <map>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "Common/ColorUtil.h"
+#include "Common/CommonFuncs.h"
+#include "Common/CommonTypes.h"
+#include "Common/FileUtil.h"
+#include "Common/StringUtil.h"
+#include "DiscIO/Enums.h"
+#include "DiscIO/Volume.h"
+
+namespace DiscIO
+{
+static const unsigned int WII_BANNER_WIDTH = 192;
+static const unsigned int WII_BANNER_HEIGHT = 64;
+static const unsigned int WII_BANNER_SIZE = WII_BANNER_WIDTH * WII_BANNER_HEIGHT * 2;
+static const unsigned int WII_BANNER_OFFSET = 0xA0;
+
+std::vector<u32> IVolume::GetWiiBanner(int* width, int* height, u64 title_id)
+{
+  *width = 0;
+  *height = 0;
+
+  std::string file_name = StringFromFormat("%s/title/%08x/%08x/data/banner.bin",
+                                           File::GetUserPath(D_WIIROOT_IDX).c_str(),
+                                           (u32)(title_id >> 32), (u32)title_id);
+  if (!File::Exists(file_name))
+    return std::vector<u32>();
+
+  if (File::GetSize(file_name) < WII_BANNER_OFFSET + WII_BANNER_SIZE)
+    return std::vector<u32>();
+
+  File::IOFile file(file_name, "rb");
+  if (!file.Seek(WII_BANNER_OFFSET, SEEK_SET))
+    return std::vector<u32>();
+
+  std::vector<u8> banner_file(WII_BANNER_SIZE);
+  if (!file.ReadBytes(banner_file.data(), banner_file.size()))
+    return std::vector<u32>();
+
+  std::vector<u32> image_buffer(WII_BANNER_WIDTH * WII_BANNER_HEIGHT);
+  ColorUtil::decode5A3image(image_buffer.data(), (u16*)banner_file.data(), WII_BANNER_WIDTH,
+                            WII_BANNER_HEIGHT);
+
+  *width = WII_BANNER_WIDTH;
+  *height = WII_BANNER_HEIGHT;
+  return image_buffer;
+}
+
+std::map<Language, std::string> IVolume::ReadWiiNames(const std::vector<u8>& data)
+{
+  std::map<Language, std::string> names;
+  for (size_t i = 0; i < NUMBER_OF_LANGUAGES; ++i)
+  {
+    size_t name_start = NAME_BYTES_LENGTH * i;
+    size_t name_end = name_start + NAME_BYTES_LENGTH;
+    if (data.size() >= name_end)
+    {
+      u16* temp = (u16*)(data.data() + name_start);
+      std::wstring out_temp(NAME_STRING_LENGTH, '\0');
+      std::transform(temp, temp + out_temp.size(), out_temp.begin(), (u16(&)(u16))Common::swap16);
+      out_temp.erase(std::find(out_temp.begin(), out_temp.end(), 0x00), out_temp.end());
+      std::string name = UTF16ToUTF8(out_temp);
+      if (!name.empty())
+        names[static_cast<Language>(i)] = name;
+    }
+  }
+  return names;
+}
+}