file_io.h

/*
 * Copyright (C) 2011-2013 Garantia Data Ltd.
 *
 * This file is part of memtier_benchmark.
 *
 * memtier_benchmark 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, version 2.
 *
 * memtier_benchmark 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 memtier_benchmark.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _FILE_IO_H
#define _FILE_IO_H

#include <stdio.h>
#include "item.h"

/** Provides a mechanism to read a CSV-like memcache_dump file and extract memcache
 * items from it.
 */
class file_reader {
protected:
    const char *m_filename;     /** name of file */
    FILE* m_file;               /** handle of open file */

    unsigned int m_line;        /** current line being read */

    char* read_string(unsigned int len, unsigned int alloc_len, unsigned int* actual_len);
public:
    file_reader(const char *filename);
    file_reader(const file_reader& from);
    ~file_reader();

    bool open_file(void);
    bool is_eof(void);
    memcache_item* read_item(void);
};


/** Provides a mechanism to write memcache items into a CSV-like memcache_dump file.
 */
class file_writer {
protected:
    const char *m_filename;     /** name of file */
    FILE *m_file;               /** handle of open file */

    char* get_quoted_str(char* str, int str_len, int* new_str_len);
    
public:
    file_writer(const char *filename);
    ~file_writer();

    bool open_file(void);
    bool write_item(memcache_item *item);
};

#endif  /* _FILE_IO_H */