CDImage: Support SBI replacement subchannel Q for cue/bin images

src/common/cd_subchannel_replacement.h

@@ -0,0 +1,34 @@
+#pragma once
+#include "cd_image.h"
+#include "types.h"
+#include <array>
+#include <cstdio>
+#include <unordered_map>
+
+class CDSubChannelReplacement
+{
+public:
+  enum : u32
+  {
+    SUBCHANNEL_Q_SIZE = 12,
+  };
+
+  CDSubChannelReplacement();
+  ~CDSubChannelReplacement();
+
+  u32 GetReplacementSectorCount() const { return static_cast<u32>(m_replacement_subq.size()); }
+
+  bool LoadSBI(const char* path);
+
+  /// Returns the replacement subchannel data for the specified position (in BCD).
+  bool GetReplacementSubChannelQ(u8 minute_bcd, u8 second_bcd, u8 frame_bcd, u8* subq_data) const;
+
+  /// Returns the replacement subchannel data for the specified sector.
+  bool GetReplacementSubChannelQ(u32 lba, u8* subq_data) const;
+
+private:
+  using ReplacementData = std::array<u8, SUBCHANNEL_Q_SIZE>;
+  using ReplacementMap = std::unordered_map<u32, ReplacementData>;
+
+  std::unordered_map<u32, ReplacementData> m_replacement_subq;
+};