// (C) 2018-2024 by Folkert van Heusden // Released under MIT license #pragma once #include #include #include #include #include #include #include "gen.h" class disk_backend { protected: #if IS_POSIX bool use_overlay { false }; std::map > overlay; void store_object_in_overlay(const off_t id, const std::vector & data); bool store_mem_range_in_overlay(const off_t offset, const size_t n, const uint8_t *const from, const size_t sector_size); std::optional > get_object_from_overlay(const off_t id); std::optional > get_from_overlay(const off_t offset, const size_t sector_size); json_t *serialize_overlay() const; void deserialize_overlay(const json_t *const j); #endif public: disk_backend(); virtual ~disk_backend(); #if IS_POSIX virtual json_t *serialize() const = 0; static disk_backend *deserialize(const json_t *const j); #endif virtual std::string get_identifier() const = 0; virtual bool begin(const bool disk_snapshots) = 0; virtual bool read(const off_t offset, const size_t n, uint8_t *const target, const size_t sector_size) = 0; virtual bool write(const off_t offset, const size_t n, const uint8_t *const from, const size_t sector_size) = 0; };