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/*************************************************************************/
/* file_access.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef FILE_ACCESS_H
#define FILE_ACCESS_H
#include "core/math/math_defs.h"
#include "core/os/memory.h"
#include "core/string/ustring.h"
#include "core/typedefs.h"
/**
* Multi-Platform abstraction for accessing to files.
*/
class FileAccess {
public:
enum AccessType {
ACCESS_RESOURCES,
ACCESS_USERDATA,
ACCESS_FILESYSTEM,
ACCESS_MAX
};
typedef void (*FileCloseFailNotify)(const String &);
typedef FileAccess *(*CreateFunc)();
bool endian_swap = false;
bool real_is_double = false;
virtual uint32_t _get_unix_permissions(const String &p_file) = 0;
virtual Error _set_unix_permissions(const String &p_file, uint32_t p_permissions) = 0;
protected:
String fix_path(const String &p_path) const;
virtual Error _open(const String &p_path, int p_mode_flags) = 0; ///< open a file
virtual uint64_t _get_modified_time(const String &p_file) = 0;
static FileCloseFailNotify close_fail_notify;
private:
static bool backup_save;
AccessType _access_type = ACCESS_FILESYSTEM;
static CreateFunc create_func[ACCESS_MAX]; /** default file access creation function for a platform */
template <class T>
static FileAccess *_create_builtin() {
return memnew(T);
}
public:
static void set_file_close_fail_notify_callback(FileCloseFailNotify p_cbk) { close_fail_notify = p_cbk; }
virtual void _set_access_type(AccessType p_access);
enum ModeFlags {
READ = 1,
WRITE = 2,
READ_WRITE = 3,
WRITE_READ = 7,
};
virtual void close() = 0; ///< close a file
virtual bool is_open() const = 0; ///< true when file is open
virtual String get_path() const { return ""; } /// returns the path for the current open file
virtual String get_path_absolute() const { return ""; } /// returns the absolute path for the current open file
virtual void seek(uint64_t p_position) = 0; ///< seek to a given position
virtual void seek_end(int64_t p_position = 0) = 0; ///< seek from the end of file with negative offset
virtual uint64_t get_position() const = 0; ///< get position in the file
virtual uint64_t get_length() const = 0; ///< get size of the file
virtual bool eof_reached() const = 0; ///< reading passed EOF
virtual uint8_t get_8() const = 0; ///< get a byte
virtual uint16_t get_16() const; ///< get 16 bits uint
virtual uint32_t get_32() const; ///< get 32 bits uint
virtual uint64_t get_64() const; ///< get 64 bits uint
virtual float get_float() const;
virtual double get_double() const;
virtual real_t get_real() const;
virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const; ///< get an array of bytes
virtual String get_line() const;
virtual String get_token() const;
virtual Vector<String> get_csv_line(const String &p_delim = ",") const;
virtual String get_as_utf8_string() const;
/**< use this for files WRITTEN in _big_ endian machines (ie, amiga/mac)
* It's not about the current CPU type but file formats.
* this flags get reset to false (little endian) on each open
*/
virtual void set_endian_swap(bool p_swap) { endian_swap = p_swap; }
inline bool get_endian_swap() const { return endian_swap; }
virtual Error get_error() const = 0; ///< get last error
virtual void flush() = 0;
virtual void store_8(uint8_t p_dest) = 0; ///< store a byte
virtual void store_16(uint16_t p_dest); ///< store 16 bits uint
virtual void store_32(uint32_t p_dest); ///< store 32 bits uint
virtual void store_64(uint64_t p_dest); ///< store 64 bits uint
virtual void store_float(float p_dest);
virtual void store_double(double p_dest);
virtual void store_real(real_t p_real);
virtual void store_string(const String &p_string);
virtual void store_line(const String &p_line);
virtual void store_csv_line(const Vector<String> &p_values, const String &p_delim = ",");
virtual void store_pascal_string(const String &p_string);
virtual String get_pascal_string();
virtual void store_buffer(const uint8_t *p_src, uint64_t p_length); ///< store an array of bytes
virtual bool file_exists(const String &p_name) = 0; ///< return true if a file exists
virtual Error reopen(const String &p_path, int p_mode_flags); ///< does not change the AccessType
static FileAccess *create(AccessType p_access); /// Create a file access (for the current platform) this is the only portable way of accessing files.
static FileAccess *create_for_path(const String &p_path);
static FileAccess *open(const String &p_path, int p_mode_flags, Error *r_error = nullptr); /// Create a file access (for the current platform) this is the only portable way of accessing files.
static CreateFunc get_create_func(AccessType p_access);
static bool exists(const String &p_name); ///< return true if a file exists
static uint64_t get_modified_time(const String &p_file);
static uint32_t get_unix_permissions(const String &p_file);
static Error set_unix_permissions(const String &p_file, uint32_t p_permissions);
static void set_backup_save(bool p_enable) { backup_save = p_enable; };
static bool is_backup_save_enabled() { return backup_save; };
static String get_md5(const String &p_file);
static String get_sha256(const String &p_file);
static String get_multiple_md5(const Vector<String> &p_file);
static Vector<uint8_t> get_file_as_array(const String &p_path, Error *r_error = nullptr);
static String get_file_as_string(const String &p_path, Error *r_error = nullptr);
template <class T>
static void make_default(AccessType p_access) {
create_func[p_access] = _create_builtin<T>;
}
FileAccess() {}
virtual ~FileAccess() {}
};
struct FileAccessRef {
_FORCE_INLINE_ FileAccess *operator->() {
return f;
}
operator bool() const { return f != nullptr; }
FileAccess *f;
operator FileAccess *() { return f; }
FileAccessRef(FileAccess *fa) { f = fa; }
~FileAccessRef() {
if (f) {
memdelete(f);
}
}
};
#endif // FILE_ACCESS_H
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