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200 lines
7.8 KiB
C++
200 lines
7.8 KiB
C++
/*************************************************************************/
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/* file_access.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef FILE_ACCESS_H
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#define FILE_ACCESS_H
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#include "core/math/math_defs.h"
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#include "core/os/memory.h"
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#include "core/typedefs.h"
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#include "core/ustring.h"
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/**
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* Multi-Platform abstraction for accessing to files.
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*/
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class FileAccess {
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public:
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enum AccessType {
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ACCESS_RESOURCES,
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ACCESS_USERDATA,
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ACCESS_FILESYSTEM,
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ACCESS_MAX
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};
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typedef void (*FileCloseFailNotify)(const String &);
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typedef FileAccess *(*CreateFunc)();
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bool endian_swap;
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bool real_is_double;
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virtual uint32_t _get_unix_permissions(const String &p_file) = 0;
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virtual Error _set_unix_permissions(const String &p_file, uint32_t p_permissions) = 0;
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protected:
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String fix_path(const String &p_path) const;
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virtual Error _open(const String &p_path, int p_mode_flags) = 0; ///< open a file
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virtual uint64_t _get_modified_time(const String &p_file) = 0;
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static FileCloseFailNotify close_fail_notify;
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private:
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static bool backup_save;
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AccessType _access_type;
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static CreateFunc create_func[ACCESS_MAX]; /** default file access creation function for a platform */
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template <class T>
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static FileAccess *_create_builtin() {
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return memnew(T);
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}
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public:
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static void set_file_close_fail_notify_callback(FileCloseFailNotify p_cbk) { close_fail_notify = p_cbk; }
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virtual void _set_access_type(AccessType p_access);
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enum ModeFlags {
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READ = 1,
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WRITE = 2,
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READ_WRITE = 3,
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WRITE_READ = 7,
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};
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virtual void close() = 0; ///< close a file
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virtual bool is_open() const = 0; ///< true when file is open
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virtual String get_path() const { return ""; } /// returns the path for the current open file
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virtual String get_path_absolute() const { return ""; } /// returns the absolute path for the current open file
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virtual void seek(uint64_t p_position) = 0; ///< seek to a given position
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virtual void seek_end(int64_t p_position = 0) = 0; ///< seek from the end of file with negative offset
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virtual uint64_t get_position() const = 0; ///< get position in the file
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virtual uint64_t get_len() const = 0; ///< get size of the file
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virtual bool eof_reached() const = 0; ///< reading passed EOF
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virtual uint8_t get_8() const = 0; ///< get a byte
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virtual uint16_t get_16() const; ///< get 16 bits uint
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virtual uint32_t get_32() const; ///< get 32 bits uint
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virtual uint64_t get_64() const; ///< get 64 bits uint
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virtual float get_float() const;
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virtual double get_double() const;
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virtual real_t get_real() const;
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virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const; ///< get an array of bytes
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virtual String get_line() const;
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virtual String get_token() const;
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virtual Vector<String> get_csv_line(const String &p_delim = ",") const;
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virtual String get_as_utf8_string() const;
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/**< use this for files WRITTEN in _big_ endian machines (ie, amiga/mac)
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* It's not about the current CPU type but file formats.
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* this flags get reset to false (little endian) on each open
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*/
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virtual void set_endian_swap(bool p_swap) { endian_swap = p_swap; }
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inline bool get_endian_swap() const { return endian_swap; }
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virtual Error get_error() const = 0; ///< get last error
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virtual void flush() = 0;
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virtual void store_8(uint8_t p_dest) = 0; ///< store a byte
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virtual void store_16(uint16_t p_dest); ///< store 16 bits uint
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virtual void store_32(uint32_t p_dest); ///< store 32 bits uint
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virtual void store_64(uint64_t p_dest); ///< store 64 bits uint
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virtual void store_float(float p_dest);
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virtual void store_double(double p_dest);
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virtual void store_real(real_t p_real);
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virtual void store_string(const String &p_string);
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virtual void store_line(const String &p_line);
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virtual void store_csv_line(const Vector<String> &p_values, const String &p_delim = ",");
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virtual void store_pascal_string(const String &p_string);
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virtual String get_pascal_string();
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virtual void store_buffer(const uint8_t *p_src, uint64_t p_length); ///< store an array of bytes
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virtual bool file_exists(const String &p_name) = 0; ///< return true if a file exists
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virtual Error reopen(const String &p_path, int p_mode_flags); ///< does not change the AccessType
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static FileAccess *create(AccessType p_access); /// Create a file access (for the current platform) this is the only portable way of accessing files.
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static FileAccess *create_for_path(const String &p_path);
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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.
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static CreateFunc get_create_func(AccessType p_access);
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static bool exists(const String &p_name); ///< return true if a file exists
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static uint64_t get_modified_time(const String &p_file);
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static uint32_t get_unix_permissions(const String &p_file);
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static Error set_unix_permissions(const String &p_file, uint32_t p_permissions);
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static void set_backup_save(bool p_enable) { backup_save = p_enable; };
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static bool is_backup_save_enabled() { return backup_save; };
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static String get_md5(const String &p_file);
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static String get_sha256(const String &p_file);
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static String get_multiple_md5(const Vector<String> &p_file);
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static Vector<uint8_t> get_file_as_array(const String &p_path, Error *r_error = nullptr);
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static String get_file_as_string(const String &p_path, Error *r_error = nullptr);
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template <class T>
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static void make_default(AccessType p_access) {
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create_func[p_access] = _create_builtin<T>;
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}
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FileAccess();
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virtual ~FileAccess() {}
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};
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struct FileAccessRef {
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_FORCE_INLINE_ FileAccess *operator->() {
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return f;
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}
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operator bool() const { return f != nullptr; }
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FileAccess *f;
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operator FileAccess *() { return f; }
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FileAccessRef(FileAccess *fa) { f = fa; }
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FileAccessRef(FileAccessRef &&other) {
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f = other.f;
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other.f = nullptr;
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}
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~FileAccessRef() {
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if (f) {
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memdelete(f);
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}
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}
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};
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#endif
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