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/*************************************************************************/
/* file_access_buffered.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 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_BUFFERED_H
#define FILE_ACCESS_BUFFERED_H
#include "core/os/file_access.h"
#include "core/ustring.h"
class FileAccessBuffered : public FileAccess {
public:
enum {
DEFAULT_CACHE_SIZE = 128 * 1024,
};
private:
int cache_size = DEFAULT_CACHE_SIZE;
int cache_data_left() const;
mutable Error last_error;
protected:
Error set_error(Error p_error) const;
mutable struct File {
bool open;
int size;
int offset;
String name;
int access_flags;
} file;
mutable struct Cache {
Vector<uint8_t> buffer;
int offset;
} cache;
virtual int read_data_block(int p_offset, int p_size, uint8_t *p_dest = 0) const = 0;
void set_cache_size(int p_size);
int get_cache_size();
public:
virtual size_t get_position() const; ///< get position in the file
virtual size_t get_len() const; ///< get size of the file
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 bool eof_reached() const;
virtual uint8_t get_8() const;
virtual int get_buffer(uint8_t *p_dest, int p_length) const; ///< get an array of bytes
virtual bool is_open() const;
virtual Error get_error() const;
FileAccessBuffered() {}
virtual ~FileAccessBuffered() {}
};
#endif
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