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245 lines
10 KiB
C++
245 lines
10 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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/io/compression.h"
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#include "core/math/math_defs.h"
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#include "core/object/ref_counted.h"
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#include "core/os/memory.h"
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#include "core/string/ustring.h"
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#include "core/typedefs.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 : public RefCounted {
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GDCLASS(FileAccess, RefCounted);
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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_PIPE,
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ACCESS_MAX
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};
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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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enum UnixPermissionFlags {
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UNIX_EXECUTE_OTHER = 0x001,
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UNIX_WRITE_OTHER = 0x002,
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UNIX_READ_OTHER = 0x004,
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UNIX_EXECUTE_GROUP = 0x008,
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UNIX_WRITE_GROUP = 0x010,
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UNIX_READ_GROUP = 0x020,
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UNIX_EXECUTE_OWNER = 0x040,
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UNIX_WRITE_OWNER = 0x080,
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UNIX_READ_OWNER = 0x100,
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UNIX_RESTRICTED_DELETE = 0x200,
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UNIX_SET_GROUP_ID = 0x400,
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UNIX_SET_USER_ID = 0x800,
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};
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enum CompressionMode {
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COMPRESSION_FASTLZ = Compression::MODE_FASTLZ,
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COMPRESSION_DEFLATE = Compression::MODE_DEFLATE,
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COMPRESSION_ZSTD = Compression::MODE_ZSTD,
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COMPRESSION_GZIP = Compression::MODE_GZIP,
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COMPRESSION_BROTLI = Compression::MODE_BROTLI,
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};
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typedef void (*FileCloseFailNotify)(const String &);
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typedef Ref<FileAccess> (*CreateFunc)();
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bool big_endian = false;
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bool real_is_double = false;
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virtual BitField<UnixPermissionFlags> _get_unix_permissions(const String &p_file) = 0;
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virtual Error _set_unix_permissions(const String &p_file, BitField<UnixPermissionFlags> p_permissions) = 0;
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virtual bool _get_hidden_attribute(const String &p_file) = 0;
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virtual Error _set_hidden_attribute(const String &p_file, bool p_hidden) = 0;
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virtual bool _get_read_only_attribute(const String &p_file) = 0;
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virtual Error _set_read_only_attribute(const String &p_file, bool p_ro) = 0;
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protected:
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static void _bind_methods();
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AccessType get_access_type() const;
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virtual String fix_path(const String &p_path) const;
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virtual Error open_internal(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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virtual void _set_access_type(AccessType p_access);
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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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thread_local static Error last_file_open_error;
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AccessType _access_type = ACCESS_FILESYSTEM;
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static CreateFunc create_func[ACCESS_MAX]; /** default file access creation function for a platform */
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template <typename T>
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static Ref<FileAccess> _create_builtin() {
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return memnew(T);
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}
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static Ref<FileAccess> _open(const String &p_path, ModeFlags p_mode_flags);
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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 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_length() 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; ///< 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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Variant get_var(bool p_allow_objects = false) const;
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virtual uint64_t get_buffer(uint8_t *p_dst, uint64_t p_length) const = 0; ///< get an array of bytes, needs to be overwritten by children.
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Vector<uint8_t> get_buffer(int64_t p_length) const;
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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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String get_as_text(bool p_skip_cr = false) const;
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virtual String get_as_utf8_string(bool p_skip_cr = false) const;
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/**
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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 flag gets reset to `false` (little endian) on each open.
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*/
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virtual void set_big_endian(bool p_big_endian) { big_endian = p_big_endian; }
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inline bool is_big_endian() const { return big_endian; }
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virtual Error get_error() const = 0; ///< get last error
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virtual Error resize(int64_t p_length) = 0;
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virtual void flush() = 0;
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virtual void store_8(uint8_t p_dest); ///< 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) = 0; ///< store an array of bytes, needs to be overwritten by children.
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void store_buffer(const Vector<uint8_t> &p_buffer);
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void store_var(const Variant &p_var, bool p_full_objects = false);
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virtual void close() = 0;
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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 Ref<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 Ref<FileAccess> create_for_path(const String &p_path);
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static Ref<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 Ref<FileAccess> open_encrypted(const String &p_path, ModeFlags p_mode_flags, const Vector<uint8_t> &p_key);
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static Ref<FileAccess> open_encrypted_pass(const String &p_path, ModeFlags p_mode_flags, const String &p_pass);
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static Ref<FileAccess> open_compressed(const String &p_path, ModeFlags p_mode_flags, CompressionMode p_compress_mode = COMPRESSION_FASTLZ);
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static Error get_open_error();
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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 BitField<FileAccess::UnixPermissionFlags> get_unix_permissions(const String &p_file);
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static Error set_unix_permissions(const String &p_file, BitField<FileAccess::UnixPermissionFlags> p_permissions);
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static bool get_hidden_attribute(const String &p_file);
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static Error set_hidden_attribute(const String &p_file, bool p_hidden);
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static bool get_read_only_attribute(const String &p_file);
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static Error set_read_only_attribute(const String &p_file, bool p_ro);
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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_bytes(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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static PackedByteArray _get_file_as_bytes(const String &p_path) { return get_file_as_bytes(p_path, &last_file_open_error); }
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static String _get_file_as_string(const String &p_path) { return get_file_as_string(p_path, &last_file_open_error); }
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template <typename 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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VARIANT_ENUM_CAST(FileAccess::CompressionMode);
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VARIANT_ENUM_CAST(FileAccess::ModeFlags);
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VARIANT_BITFIELD_CAST(FileAccess::UnixPermissionFlags);
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#endif // FILE_ACCESS_H
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