add hdd dump support, cleanup dump code into a single generic file.

sphaira/include/location.hpp

@@ -21,4 +21,21 @@ using Entries = std::vector<Entry>;
 auto Load() -> Entries;
 void Add(const Entry& e);
 
+// helper for hdd devices.
+// this doesn't really belong in this header, however
+// locations likely will be renamed to something more generic soon.
+struct StdioEntry {
+    // mount point (ums0:)
+    std::string mount{};
+    // ums0: (USB Flash Disk)
+    std::string name{};
+    // set if read-only.
+    bool write_protect;
+};
+
+using StdioEntries = std::vector<StdioEntry>;
+
+// set write=true to filter out write protected devices.
+auto GetStdio(bool write) -> StdioEntries;
+
 } // namespace sphaira::location