Add EntranceContext for managing custom entrance tile types

src/app/editor/context/entrance_context.h

@@ -0,0 +1,40 @@
+#ifndef YAZE_APP_EDITOR_CONTEXT_ENTRANCE_CONTEXT_H_
+#define YAZE_APP_EDITOR_CONTEXT_ENTRANCE_CONTEXT_H_
+
+#include <cstdint>
+#include <vector>
+
+#include "absl/status/status.h"
+#include "app/rom.h"
+
+namespace yaze {
+namespace app {
+namespace editor {
+
+class EntranceContext {
+ public:
+  absl::Status LoadEntranceTileTypes(ROM& rom) {
+    int offset_low = 0xDB8BF;
+    int offset_high = 0xDB917;
+
+    for (int i = 0; i < 0x2C; i++) {
+      // Load entrance tile types
+      ASSIGN_OR_RETURN(auto value_low, rom.ReadWord(offset_low + i));
+      entrance_tile_types_low_.push_back(value_low);
+      ASSIGN_OR_RETURN(auto value_high, rom.ReadWord(offset_high + i));
+      entrance_tile_types_low_.push_back(value_high);
+    }
+
+    return absl::OkStatus();
+  }
+
+ private:
+  std::vector<uint16_t> entrance_tile_types_low_;
+  std::vector<uint16_t> entrance_tile_types_high_;
+};
+
+}  // namespace editor
+}  // namespace app
+}  // namespace yaze
+
+#endif  // YAZE_APP_EDITOR_CONTEXT_ENTRANCE_CONTEXT_H_