MemoryCard: Split into image helper functions

src/core/memory_card_image.h

@@ -0,0 +1,53 @@
+#pragma once
+#include "common/bitfield.h"
+#include "controller.h"
+#include <array>
+#include <memory>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace MemoryCardImage
+{
+enum : u32
+{
+  DATA_SIZE = 128 * 1024, // 1mbit
+  BLOCK_SIZE = 8192,
+  FRAME_SIZE = 128,
+  FRAMES_PER_BLOCK = BLOCK_SIZE / FRAME_SIZE,
+  NUM_BLOCKS = DATA_SIZE / BLOCK_SIZE,
+  NUM_FRAMES = DATA_SIZE / FRAME_SIZE,
+  ICON_WIDTH =16,
+  ICON_HEIGHT = 16
+};
+
+using DataArray = std::array<u8, DATA_SIZE>;
+
+bool LoadFromFile(DataArray* data, const char* filename);
+bool SaveToFile(const DataArray& data, const char* filename);
+
+void Format(DataArray* data);
+
+struct IconFrame
+{
+  u32 pixels[ICON_WIDTH * ICON_HEIGHT];
+};
+
+struct FileInfo
+{
+  std::string filename;
+  std::string title;
+  u32 size;
+  u32 first_block;
+  u32 num_blocks;
+
+  std::vector<IconFrame> icon_frames;
+};
+
+u32 GetFreeBlockCount(const DataArray& data);
+std::vector<FileInfo> EnumerateFiles(const DataArray& data);
+bool ReadFile(const DataArray& data, const FileInfo& fi, std::vector<u8>* buffer);
+bool WriteFile(DataArray* data, const std::string_view& filename, const std::vector<u8>& buffer);
+bool DeleteFile(DataArray* data, const FileInfo& fi);
+bool ImportCard(DataArray* data, const char* filename);
+}