/* This file is part of vmod-binlog
   Copyright (C) 2013 Sergey Poznyakoff

   Vmod-binlog 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 3, or (at your option)
   any later version.

   Vmod-binlog 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 vmod-binlog.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <stdint.h>

#define SIZE_T_MAX ((size_t)~0)

#ifndef BINLOG_SIZE
# define BINLOG_SIZE (1024*1024*1024)
#endif

#ifndef BINLOG_PATTERN
# define BINLOG_PATTERN "%Y/%m/%d.log"
#endif

#ifndef BINLOG_INTERVAL
# define BINLOG_INTERVAL 86400
#endif

#ifndef BINLOG_UMASK
# define BINLOG_UMASK 0077
#endif

struct binlog_record {
	long nid;            /* node ID */
	long aid;            /* article ID */  
	time_t ts;           /* timestamp */
};

#define BINLOG_MAGIC_STR "NXCBINLOG"
#define BINLOG_MAGIC_LEN (sizeof(BINLOG_MAGIC_STR) - 1)
#define BINLOG_VERSION 0x00010000UL

struct binlog_file_header {
	char magic[BINLOG_MAGIC_LEN];
	char pad[16 - BINLOG_MAGIC_LEN];
	uint32_t version;
	size_t recsize;
	size_t recnum;
};

#define BINLOG_HEADER_SIZE \
   ((sizeof(struct binlog_file_header) + sizeof(struct binlog_record) - 1) / \
    sizeof(struct binlog_record))

union binlog_header {
	struct binlog_file_header hdr;
	struct binlog_record pad[BINLOG_HEADER_SIZE];
};

#define binlog_size(conf) \
	(sizeof(union binlog_header) + \
	 (conf)->recidx * sizeof(struct binlog_record))
#define binlog_recnum(conf) \
	(((conf)->size - sizeof(union binlog_header)) / \
	 sizeof(struct binlog_record))