Initial support for xex patching

src/xenia/patcher/patch_db.h

@@ -0,0 +1,78 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2022 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_PATCH_DB_H_
+#define XENIA_PATCH_DB_H_
+
+#include <map>
+
+#include "third_party/cpptoml/include/cpptoml.h"
+
+namespace xe {
+namespace patcher {
+struct PatchDataEntry {
+  const uint8_t alloc_size_;
+  const uint32_t memory_address_;
+  const uint64_t new_value_;
+
+  PatchDataEntry(const uint8_t alloc_size, const uint32_t memory_address,
+                 const uint64_t new_value)
+      : alloc_size_(alloc_size),
+        memory_address_(memory_address),
+        new_value_(new_value){};
+};
+
+struct PatchInfoEntry {
+  uint32_t id;
+  std::string patch_name;
+  std::string patch_desc;
+  std::string patch_author;
+  std::vector<PatchDataEntry> patch_data;
+  bool is_enabled;
+};
+
+struct PatchFileEntry {
+  uint32_t title_id;
+  std::string title_name;
+  uint64_t hash = 0;
+  std::vector<PatchInfoEntry> patch_info;
+};
+
+class PatchDB {
+ public:
+  PatchDB(const std::filesystem::path patches_root);
+  ~PatchDB();
+
+  void LoadPatches();
+
+  PatchFileEntry ReadPatchFile(const std::filesystem::path& file_path);
+  std::vector<PatchDataEntry>* ReadPatchData(
+      const std::string size_type,
+      const std::shared_ptr<cpptoml::table>& patch_table);
+
+  std::vector<PatchFileEntry> GetTitlePatches(uint32_t title_id,
+                                              const uint64_t hash);
+  std::vector<PatchFileEntry>& GetAllPatches() { return loaded_patches; }
+
+ private:
+  std::vector<PatchFileEntry> loaded_patches;
+  std::filesystem::path patches_root_;
+
+  uint8_t GetAllocSize(const std::string provided_size);
+
+  const std::map<std::string, size_t> patch_data_types_size = {
+      {"f64", sizeof(uint64_t)},  {"f32", sizeof(uint32_t)},
+      {"be64", sizeof(uint64_t)}, {"be32", sizeof(uint32_t)},
+      {"be16", sizeof(uint16_t)}, {"be8", sizeof(uint8_t)}};
+};
+
+}  // namespace patcher
+}  // namespace xe
+
+#endif  // XENIA_PATCH_LOADER_H_