looper/file_backend.hpp

#pragma once
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <optional>
#include <stddef.h>
#include <string.h>
#include <map>
#include <stdlib.h>
#include <SDL.h>
#include <vector>
#include <fmt/core.h>
#include <fmt/format.h>
extern "C" {
#include <vgmstream.h>
}
#include "log.hpp"
#include <stdlib.h>
#include <string.h>
enum class SeekType {
    SET,
    CUR,
    END
};
class CustomException : public std::exception {
	const char *message;
	protected:
	void clear_message(bool free_message = true) {
		if (free_message && this->message != nullptr) {
			free((void*)this->message);
		}
		this->message = nullptr;
	}
	public:
	CustomException() {
		clear_message(false);
	}
	CustomException(std::string message) : CustomException() {
		set_message(message);
	}
	void set_message(std::string message) {
		clear_message();
		this->message = strdup(message.c_str());
	}
	const char *what() const throw() {
		return this->message;
	}
	~CustomException() {
		clear_message();
	}
};
class NotFoundException : public CustomException {
	public:
	NotFoundException(std::string file) : CustomException() {
		set_message(fmt::format("File not found: {0}", file));
	}
	NotFoundException(const char *file) : NotFoundException(std::string(file)) { }
};

class File {
    protected:
    size_t len;
    int64_t pos;
    public:
    const char *name;
    File();
    inline virtual void open(const char *fname) { name = fname; }
    inline virtual void close() { }
    virtual size_t read(void *ptr, size_t size, size_t len) = 0;
    virtual void seek(int64_t pos, SeekType seek_type) = 0;
    virtual size_t get_len();
    virtual int64_t get_pos() = 0;
    inline virtual bool is_open() {
        return false;
    }
    inline virtual ~File() {
        if (is_open()) close();
    }
};
class CFile : public File {
    protected:
    FILE *file;
    public:
    CFile();
    void open(const char *fname) override;
    void close() override;
    size_t read(void *ptr, size_t size, size_t len) override;
    void seek(int64_t pos, SeekType seek_type) override;
    int64_t get_pos() override;
    bool is_open() override;
};
class MemFile : public File {
    void *ptr;
    size_t len;
    int64_t pos;
    public:
    MemFile();
    void open(const char *path) override;
    void close() override;
    size_t read(void *ptr, size_t size, size_t len) override;
    void seek(int64_t pos, SeekType seek_type) override;
    int64_t get_pos() override;
    bool is_open() override;
    size_t get_len() override;
};
class HttpFile : public File {
    std::vector<uint8_t> data;
    public:
    HttpFile();
    void open(const char *url) override;
    void close() override;
    size_t read(void *ptr, size_t size, size_t len) override;
    void seek(int64_t pos, SeekType type) override;
    int64_t get_pos() override;
    bool is_open() override;
};
#ifdef __ANDROID__
class AndroidFile : public File {
    protected:
    void *handle;
    public:
    AndroidFile();
    void open(const char *fname) override;
    void close() override;
    size_t read(void *ptr, size_t size, size_t len) override;
    void seek(int64_t pos, SeekType seek_type) override;
    int64_t get_pos() override;
    bool is_open() override;
};
#endif
#ifdef __ANDROID__
#define FILE_TYPE AndroidFile
#else
#define FILE_TYPE MemFile
#endif
STREAMFILE *get_sf_from_file(File *file);
SDL_RWops *get_sdl_file(File *file);
File *open_file(const char *fname);
File *open_url(const char *url);