mpd/src/fs/io/TextFile.hxx

/*
 * Copyright (C) 2003-2014 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef MPD_TEXT_FILE_HXX
#define MPD_TEXT_FILE_HXX

#include "check.h"
#include "Compiler.h"

#include <stddef.h>

class Path;
class Error;
class FileReader;
class AutoGunzipReader;
class BufferedReader;

class TextFile {
	FileReader *const file_reader;

#ifdef HAVE_ZLIB
	AutoGunzipReader *const gunzip_reader;
#endif

	BufferedReader *const buffered_reader;

public:
	TextFile(Path path_fs, Error &error);

	TextFile(const TextFile &other) = delete;

	~TextFile();

	bool HasFailed() const {
		return gcc_unlikely(buffered_reader == nullptr);
	}

	/**
	 * Reads a line from the input file, and strips trailing
	 * space.  There is a reasonable maximum line length, only to
	 * prevent denial of service.
	 *
	 * Use Check() after nullptr has been returned to check
	 * whether an error occurred or end-of-file has been reached.
	 *
	 * @param file the source file, opened in text mode
	 * @return a pointer to the line, or nullptr on end-of-file or error
	 */
	char *ReadLine();

	/**
	 * Check whether a ReadLine() call has thrown an error.
	 */
	bool Check(Error &error) const;
};

#endif