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/*************************************************************************/
/* file_access_network.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_NETWORK_H
#define FILE_ACCESS_NETWORK_H
#include "core/io/stream_peer_tcp.h"
#include "core/os/file_access.h"
#include "core/os/semaphore.h"
#include "core/os/thread.h"
class FileAccessNetwork;
class FileAccessNetworkClient {
struct BlockRequest {
int id;
uint64_t offset;
int size;
};
List<BlockRequest> block_requests;
Semaphore sem;
Thread thread;
bool quit = false;
Mutex mutex;
Mutex blockrequest_mutex;
Map<int, FileAccessNetwork *> accesses;
Ref<StreamPeerTCP> client;
int last_id = 0;
int lockcount = 0;
Vector<uint8_t> block;
void _thread_func();
static void _thread_func(void *s);
void put_32(int p_32);
void put_64(int64_t p_64);
int get_32();
int64_t get_64();
void lock_mutex();
void unlock_mutex();
friend class FileAccessNetwork;
static FileAccessNetworkClient *singleton;
public:
static FileAccessNetworkClient *get_singleton() { return singleton; }
Error connect(const String &p_host, int p_port, const String &p_password = "");
FileAccessNetworkClient();
~FileAccessNetworkClient();
};
class FileAccessNetwork : public FileAccess {
Semaphore sem;
Semaphore page_sem;
Mutex buffer_mutex;
bool opened = false;
size_t total_size;
mutable size_t pos = 0;
int id;
mutable bool eof_flag = false;
mutable int last_page = -1;
mutable uint8_t *last_page_buff = nullptr;
int page_size;
int read_ahead;
mutable int waiting_on_page = -1;
struct Page {
int activity = 0;
bool queued = false;
Vector<uint8_t> buffer;
};
mutable Vector<Page> pages;
mutable Error response;
uint64_t exists_modtime;
friend class FileAccessNetworkClient;
void _queue_page(int p_page) const;
void _respond(size_t p_len, Error p_status);
void _set_block(int p_offset, const Vector<uint8_t> &p_block);
public:
enum Command {
COMMAND_OPEN_FILE,
COMMAND_READ_BLOCK,
COMMAND_CLOSE,
COMMAND_FILE_EXISTS,
COMMAND_GET_MODTIME,
};
enum Response {
RESPONSE_OPEN,
RESPONSE_DATA,
RESPONSE_FILE_EXISTS,
RESPONSE_GET_MODTIME,
};
virtual Error _open(const String &p_path, int p_mode_flags); ///< open a file
virtual void close(); ///< close a file
virtual bool is_open() const; ///< true when file is open
virtual void seek(size_t p_position); ///< seek to a given position
virtual void seek_end(int64_t p_position = 0); ///< seek from the end of file
virtual size_t get_position() const; ///< get position in the file
virtual size_t get_len() const; ///< get size of the file
virtual bool eof_reached() const; ///< reading passed EOF
virtual uint8_t get_8() const; ///< get a byte
virtual int get_buffer(uint8_t *p_dst, int p_length) const;
virtual Error get_error() const; ///< get last error
virtual void flush();
virtual void store_8(uint8_t p_dest); ///< store a byte
virtual bool file_exists(const String &p_path); ///< return true if a file exists
virtual uint64_t _get_modified_time(const String &p_file);
virtual uint32_t _get_unix_permissions(const String &p_file);
virtual Error _set_unix_permissions(const String &p_file, uint32_t p_permissions);
static void configure();
FileAccessNetwork();
~FileAccessNetwork();
};
#endif // FILE_ACCESS_NETWORK_H
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