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/* stats1b.h -- statistics for the the LZO library
This file is part of the LZO real-time data compression library.
Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library 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.
The LZO library 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 the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/* WARNING: this file should *not* be used by applications. It is
part of the implementation of the library and is subject
to change.
*/
#ifndef __LZO_STATS1B_H
#define __LZO_STATS1B_H 1
#ifdef __cplusplus
extern "C" {
#endif
/***********************************************************************
// Collect statistical information when compressing.
// Useful for finetuning the compression algorithm.
// Examine the symbol 'lzo1b_stats' with a debugger.
************************************************************************/
#if (LZO_COLLECT_STATS)
# define LZO_STATS(expr) expr
#else
# define LZO_STATS(expr) ((void) 0)
#endif
#if (LZO_COLLECT_STATS)
typedef struct
{
/* algorithm configuration */
unsigned r_bits;
unsigned m3o_bits;
unsigned dd_bits;
unsigned clevel;
/* internal configuration */
unsigned d_bits;
long min_lookahead;
long max_lookbehind;
const char *compress_id;
/* counts */
long lit_runs;
long r0short_runs;
long r0fast_runs;
long r0long_runs;
long m1_matches;
long m2_matches;
long m3_matches;
long m4_matches;
long r1_matches;
/* */
long lit_run[R0MIN];
long m2_match[M2_MAX_LEN + 1];
long m3_match[M3_MAX_LEN + 1];
#if (M3O_BITS < 8)
long lit_runs_after_m3_match;
long lit_run_after_m3_match[LZO_SIZE(8-M3O_BITS)];
#endif
/* */
long matches;
long match_bytes;
long literals;
long literal_overhead;
long literal_bytes;
double literal_overhead_percent;
/* */
long unused_dict_entries;
double unused_dict_entries_percent;
/* */
long in_len;
long out_len;
}
lzo1b_stats_t;
void _lzo1b_stats_init(lzo1b_stats_t *lzo_stats);
void _lzo1b_stats_calc(lzo1b_stats_t *lzo_stats);
extern lzo1b_stats_t * const lzo1b_stats;
#define lzo_stats_t lzo1b_stats_t
#define lzo_stats lzo1b_stats
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* already included */
/* vim:set ts=4 sw=4 et: */
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