Add pcsxr and libretro cheat list parsing

src/core/cheats.h

@@ -0,0 +1,87 @@
+#pragma once
+#include "common/bitfield.h"
+#include "types.h"
+#include <optional>
+#include <string>
+#include <vector>
+
+struct CheatCode
+{
+  enum class InstructionCode : u8
+  {
+    ConstantWrite8 = 0x30,
+    ConstantWrite16 = 0x80,
+    Increment16 = 0x10,
+    Decrement16 = 0x11,
+    Increment8 = 0x20,
+    Decrement8 = 0x21,
+    CompareEqual16 = 0xD0,
+    CompareNotEqual16 = 0xD1,
+    CompareLess16 = 0xD2,
+    CompareGreater16 = 0xD3,
+    CompareEqual8 = 0xE0,
+    CompareNotEqual8 = 0xE1,
+    CompareLess8 = 0xE2,
+    CompareGreater8 = 0xE3,
+    Slide = 0x50
+  };
+
+  union Instruction
+  {
+    u64 bits;
+
+    struct
+    {
+      u32 second;
+      u32 first;
+    };
+
+    BitField<u64, InstructionCode, 32 + 24, 8> code;
+    BitField<u64, u32, 32, 24> address;
+    BitField<u64, u16, 0, 16> value16;
+    BitField<u64, u8, 0, 8> value8;
+  };
+
+  std::string description;
+  std::vector<Instruction> instructions;
+  bool enabled;
+
+  ALWAYS_INLINE bool Valid() const { return !instructions.empty() && !description.empty(); }
+
+  void Apply() const;
+};
+
+class CheatList final
+{
+public:
+  enum class Format
+  {
+    Autodetect,
+    PCSXR,
+    Libretro,
+    Count
+  };
+
+  CheatList();
+  ~CheatList();
+
+  ALWAYS_INLINE const CheatCode& GetCode(u32 i) const { return m_codes[i]; }
+  ALWAYS_INLINE CheatCode& GetCode(u32 i) { return m_codes[i]; }
+  ALWAYS_INLINE u32 GetCodeCount() const { return static_cast<u32>(m_codes.size()); }
+
+  void AddCode(CheatCode cc);
+  void RemoveCode(u32 i);
+
+  static std::optional<Format> DetectFileFormat(const char* filename);
+
+  bool LoadFromFile(const char* filename, Format format);
+  bool LoadFromPCSXRFile(const char* filename);
+  bool LoadFromLibretroFile(const char* filename);
+
+  bool SaveToPCSXRFile(const char* filename);
+
+  void Apply();
+
+private:
+  std::vector<CheatCode> m_codes;
+};