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95 lines
3.4 KiB
C++
95 lines
3.4 KiB
C++
/*************************************************************************/
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/* file_access_buffered.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* http://www.godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 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_BUFFERED_H
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#define FILE_ACCESS_BUFFERED_H
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#include "os/file_access.h"
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#include "dvector.h"
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#include "ustring.h"
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class FileAccessBuffered : public FileAccess {
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public:
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enum {
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DEFAULT_CACHE_SIZE = 128 * 1024,
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};
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private:
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int cache_size;
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int cache_data_left() const;
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mutable Error last_error;
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protected:
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Error set_error(Error p_error) const;
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mutable struct File {
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bool open;
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int size;
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int offset;
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String name;
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int access_flags;
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} file;
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mutable struct Cache {
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Vector<uint8_t> buffer;
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int offset;
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} cache;
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virtual int read_data_block(int p_offset, int p_size, uint8_t *p_dest = 0) const = 0;
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void set_cache_size(int p_size);
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int get_cache_size();
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public:
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virtual size_t get_pos() const; ///< get position in the file
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virtual size_t get_len() const; ///< get size of the file
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virtual void seek(size_t p_position); ///< seek to a given position
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virtual void seek_end(int64_t p_position = 0); ///< seek from the end of file
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virtual bool eof_reached() const;
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virtual uint8_t get_8() const;
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virtual int get_buffer(uint8_t *p_dest, int p_length) const; ///< get an array of bytes
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virtual bool is_open() const;
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virtual Error get_error() const;
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FileAccessBuffered();
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virtual ~FileAccessBuffered();
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};
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#endif
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