添加了标准库 std.file。支持简单的文件读写

src/Module/CppLibrary/CppLibrary.hpp

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+#pragma once
+
+#include "File/File.hpp"

src/Module/CppLibrary/File/File.hpp

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+#pragma once
+
+#include <cassert>
+#include <cstdint>
+#include <fstream>
+#include <limits>
+#include <vector>
+
+namespace Fig::CppLibrary
+{
+    using FileIDType = uint16_t;
+    struct File
+    {
+        FileIDType id;
+        std::fstream *fs;
+    };
+    class FileManager
+    {
+    private:
+        std::vector<File *> handlers;
+        std::vector<FileIDType> free_handlers;
+
+        FileIDType allocated = 0;
+
+    public:
+        static constexpr FileIDType MAX_HANDLERS = std::numeric_limits<FileIDType>::max();
+        static constexpr unsigned int MAX_FILE_BUF = 961200; // bytes
+
+        FileIDType AllocFile(std::fstream *fs)
+        {
+            FileIDType id = allocated++;
+            File *f = new File{.id = id, .fs = fs};
+            handlers.push_back(f);
+            return id;
+        }
+
+        void CloseFile(FileIDType id)
+        {
+            assert(id < allocated && "CloseHandler: id out of range");
+            File *f = handlers[id];
+            if (f == nullptr) { return; }
+            f->fs->close();
+            delete f->fs;
+            delete f;
+            free_handlers.push_back(id);
+            handlers[id] = nullptr;
+        }
+
+        File *GetNextFreeFile()
+        {
+            // if there is no free handler, create a new one
+            if (free_handlers.size() > 0)
+            {
+                FileIDType id = *free_handlers.begin();
+                handlers[id] = new File{.id = id, .fs = new std::fstream};
+                free_handlers.erase(free_handlers.begin());
+                return handlers[id];
+            }
+            return handlers[AllocFile(new std::fstream)];
+        }
+
+        File *GetFile(FileIDType id)
+        {
+            assert(id < allocated && "GetFile: id out of range");
+            return handlers[id];
+        }
+
+        static FileManager &getInstance()
+        {
+            static FileManager fm;
+            return fm;
+        }
+    };
+}; // namespace Fig::CppLibrary