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1 /* stats1b.h -- statistics for the the LZO library
2 
3    This file is part of the LZO real-time data compression library.
4 
5    Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
6    All Rights Reserved.
7 
8    The LZO library is free software; you can redistribute it and/or
9    modify it under the terms of the GNU General Public License as
10    published by the Free Software Foundation; either version 2 of
11    the License, or (at your option) any later version.
12 
13    The LZO library is distributed in the hope that it will be useful,
14    but WITHOUT ANY WARRANTY; without even the implied warranty of
15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16    GNU General Public License for more details.
17 
18    You should have received a copy of the GNU General Public License
19    along with the LZO library; see the file COPYING.
20    If not, write to the Free Software Foundation, Inc.,
21    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 
23    Markus F.X.J. Oberhumer
24    <markus@oberhumer.com>
25    http://www.oberhumer.com/opensource/lzo/
26  */
27 
28 
29 /* WARNING: this file should *not* be used by applications. It is
30    part of the implementation of the library and is subject
31    to change.
32  */
33 
34 
35 #ifndef __LZO_STATS1B_H
36 #define __LZO_STATS1B_H 1
37 
38 #ifdef __cplusplus
39 extern "C" {
40 #endif
41 
42 
43 /***********************************************************************
44 // Collect statistical information when compressing.
45 // Useful for finetuning the compression algorithm.
46 // Examine the symbol 'lzo1b_stats' with a debugger.
47 ************************************************************************/
48 
49 #if (LZO_COLLECT_STATS)
50 #  define LZO_STATS(expr)   expr
51 #else
52 #  define LZO_STATS(expr)   ((void) 0)
53 #endif
54 
55 
56 #if (LZO_COLLECT_STATS)
57 
58 typedef struct
59 {
60 /* algorithm configuration */
61     unsigned r_bits;
62     unsigned m3o_bits;
63     unsigned dd_bits;
64     unsigned clevel;
65 
66 /* internal configuration */
67     unsigned d_bits;
68     long min_lookahead;
69     long max_lookbehind;
70     const char *compress_id;
71 
72 /* counts */
73     long lit_runs;
74     long r0short_runs;
75     long r0fast_runs;
76     long r0long_runs;
77     long m1_matches;
78     long m2_matches;
79     long m3_matches;
80     long m4_matches;
81     long r1_matches;
82 
83 /* */
84     long lit_run[R0MIN];
85     long m2_match[M2_MAX_LEN + 1];
86     long m3_match[M3_MAX_LEN + 1];
87 #if (M3O_BITS < 8)
88     long lit_runs_after_m3_match;
89     long lit_run_after_m3_match[LZO_SIZE(8-M3O_BITS)];
90 #endif
91 
92 /* */
93     long matches;
94     long match_bytes;
95     long literals;
96     long literal_overhead;
97     long literal_bytes;
98     double literal_overhead_percent;
99 
100 /* */
101     long unused_dict_entries;
102     double unused_dict_entries_percent;
103 
104 /* */
105     long in_len;
106     long out_len;
107 }
108 lzo1b_stats_t;
109 
110 
111 void _lzo1b_stats_init(lzo1b_stats_t *lzo_stats);
112 void _lzo1b_stats_calc(lzo1b_stats_t *lzo_stats);
113 
114 extern lzo1b_stats_t * const lzo1b_stats;
115 
116 #define lzo_stats_t     lzo1b_stats_t
117 #define lzo_stats       lzo1b_stats
118 
119 #endif
120 
121 
122 #ifdef __cplusplus
123 } /* extern "C" */
124 #endif
125 
126 #endif /* already included */
127 
128 /*
129 vi:ts=4:et
130 */
131