Qt/FilesystemWidget: Add size column

Source/Core/DiscIO/Filesystem.cpp

@@ -8,6 +8,19 @@ namespace DiscIO
 {
 FileInfo::~FileInfo() = default;
 
+u64 FileInfo::GetTotalSize() const
+{
+  if (!IsDirectory())
+    return GetSize();
+
+  u64 size = 0;
+
+  for (const auto& entry : *this)
+    size += entry.GetTotalSize();
+
+  return size;
+}
+
 FileSystem::~FileSystem() = default;
 
-}  // namespace
+}  // namespace DiscIO

Source/Core/DiscIO/Filesystem.h

@@ -86,6 +86,8 @@ public:
   // The size of a file.
   // Not guaranteed to return a meaningful value for directories.
   virtual u32 GetSize() const = 0;
+  // For a file, returns its size. For a directory, returns the total size of its contents.
+  u64 GetTotalSize() const;
   virtual bool IsDirectory() const = 0;
   // The number of files and directories in a directory, including those in subdirectories.
   // Not guaranteed to return a meaningful value for files.
@@ -124,4 +126,4 @@ public:
 // because it will check IsValid for you, will automatically pick the right type of filesystem,
 // and will cache the filesystem in case it's needed again later.
 
-}  // namespace
+}  // namespace DiscIO