godot/core/io/file_access_buffered_fa.h

/*************************************************************************/
/*  file_access_buffered_fa.h                                            */
/*************************************************************************/
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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#ifndef FILE_ACCESS_BUFFERED_FA_H
#define FILE_ACCESS_BUFFERED_FA_H

#include "core/io/file_access_buffered.h"

template <class T>
class FileAccessBufferedFA : public FileAccessBuffered {

	T f;

	int read_data_block(int p_offset, int p_size, uint8_t *p_dest = 0) const {

		ERR_FAIL_COND_V(!f.is_open(), -1);

		((T *)&f)->seek(p_offset);

		if (p_dest) {

			f.get_buffer(p_dest, p_size);
			return p_size;

		} else {

			cache.offset = p_offset;
			cache.buffer.resize(p_size);

			// on dvector
			//PoolVector<uint8_t>::Write write = cache.buffer.write();
			//f.get_buffer(write.ptrw(), p_size);

			// on vector
			f.get_buffer(cache.buffer.ptrw(), p_size);

			return p_size;
		};
	};

	static FileAccess *create() {

		return memnew(FileAccessBufferedFA<T>());
	};

protected:
	virtual void _set_access_type(AccessType p_access) {
		f._set_access_type(p_access);
		FileAccessBuffered::_set_access_type(p_access);
	};

public:
	void flush() {

		f.flush();
	};

	void store_8(uint8_t p_dest) {

		f.store_8(p_dest);
	};

	void store_buffer(const uint8_t *p_src, int p_length) {

		f.store_buffer(p_src, p_length);
	};

	bool file_exists(const String &p_name) {

		return f.file_exists(p_name);
	};

	Error _open(const String &p_path, int p_mode_flags) {

		close();

		Error ret = f._open(p_path, p_mode_flags);
		if (ret != OK)
			return ret;
		//ERR_FAIL_COND_V( ret != OK, ret );

		file.size = f.get_len();
		file.offset = 0;
		file.open = true;
		file.name = p_path;
		file.access_flags = p_mode_flags;

		cache.buffer.resize(0);
		cache.offset = 0;

		return set_error(OK);
	};

	void close() {

		f.close();

		file.offset = 0;
		file.size = 0;
		file.open = false;
		file.name = "";

		cache.buffer.resize(0);
		cache.offset = 0;
		set_error(OK);
	};

	/*
	static void make_default() {
		FileAccess::create_func = FileAccessBufferedFA<T>::create;
	};
	*/

	virtual uint64_t _get_modified_time(const String &p_file) {

		return f._get_modified_time(p_file);
	}

	FileAccessBufferedFA(){

	};
};

#endif // FILE_ACCESS_BUFFERED_FA_H