VolumeVerifier: Add datfile parsing

Source/Core/DiscIO/VolumeVerifier.h

@@ -21,7 +21,7 @@
 
 // To be used as follows:
 //
-// VolumeVerifier verifier(volume);
+// VolumeVerifier verifier(volume, redump_verification, hashes_to_calculate);
 // verifier.Start();
 // while (verifier.GetBytesProcessed() != verifier.GetTotalBytes())
 //   verifier.Process();
@@ -36,6 +36,53 @@ namespace DiscIO
 {
 class FileInfo;
 
+template <typename T>
+struct Hashes
+{
+  T crc32;
+  T md5;
+  T sha1;
+};
+
+class RedumpVerifier final
+{
+public:
+  enum class Status
+  {
+    Unknown,
+    GoodDump,
+    BadDump,
+    Error,
+  };
+
+  struct Result
+  {
+    Status status = Status::Unknown;
+    std::string message;
+  };
+
+  void Start(const Volume& volume);
+  Result Finish(const Hashes<std::vector<u8>>& hashes);
+
+private:
+  struct PotentialMatch
+  {
+    u64 size;
+    Hashes<std::vector<u8>> hashes;
+  };
+
+  std::vector<PotentialMatch> ScanXML();
+
+  std::string m_dat_filename;
+  std::string m_game_id;
+  u16 m_revision;
+  u8 m_disc_number;
+  u64 m_size;
+
+  std::future<std::vector<PotentialMatch>> m_future;
+  Result m_result;
+};
+
 class VolumeVerifier final
 {
 public:
@@ -53,22 +100,15 @@ public:
     std::string text;
   };
 
-  template <typename T>
-  struct Hashes
-  {
-    T crc32;
-    T md5;
-    T sha1;
-  };
-
   struct Result
   {
     Hashes<std::vector<u8>> hashes;
     std::string summary_text;
     std::vector<Problem> problems;
+    RedumpVerifier::Result redump;
   };
 
-  VolumeVerifier(const Volume& volume, Hashes<bool> hashes_to_calculate);
+  VolumeVerifier(const Volume& volume, bool redump_verification, Hashes<bool> hashes_to_calculate);
   ~VolumeVerifier();
 
   void Start();
@@ -111,6 +151,9 @@ private:
   bool m_is_datel = false;
   bool m_is_not_retail = false;
 
+  bool m_redump_verification;
+  RedumpVerifier m_redump_verifier;
+
   Hashes<bool> m_hashes_to_calculate{};
   bool m_calculating_any_hash = false;
   unsigned long m_crc32_context = 0;