lzo/src/stats1a.h

   1 /* stats1a.h -- statistics for the the LZO1A algorithm
   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 LZO package and is subject
  31    to change.
  32  */
  33
  34
  35 #ifndef __LZO_STATS1A_H
  36 #define __LZO_STATS1A_H 1
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42
  43
  44 /***********************************************************************
  45 // collect statistical information when compressing
  46 // used for finetuning, view 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 /***********************************************************************
  57 //
  58 ************************************************************************/
  59
  60 typedef struct {
  61
  62 /* configuration */
  63     unsigned rbits;
  64     unsigned clevel;
  65
  66 /* internal configuration */
  67     unsigned dbits;
  68     unsigned lbits;
  69
  70 /* constants */
  71     unsigned min_match_short;
  72     unsigned max_match_short;
  73     unsigned min_match_long;
  74     unsigned max_match_long;
  75     unsigned min_offset;
  76     unsigned max_offset;
  77     unsigned r0min;
  78     unsigned r0fast;
  79     unsigned r0max;
  80
  81 /* counts */
  82     long short_matches;
  83     long long_matches;
  84     long r1_matches;
  85     long lit_runs;
  86     long lit_runs_after_long_match;
  87     long r0short_runs;
  88     long r0fast_runs;
  89     long r0long_runs;
  90
  91 /* */
  92     long lit_run[RSIZE];
  93     long lit_run_after_long_match[RSIZE];
  94     long short_match[MAX_MATCH_SHORT + 1];
  95     long long_match[MAX_MATCH_LONG + 1];
  96     long marker[256];
  97
  98 /* these could prove useful for further optimizations */
  99     long short_match_offset_osize[MAX_MATCH_SHORT + 1];
 100     long short_match_offset_256[MAX_MATCH_SHORT + 1];
 101     long short_match_offset_1024[MAX_MATCH_SHORT + 1];
 102     long matches_out_of_range;
 103     long matches_out_of_range_2;
 104     long matches_out_of_range_4;
 105     long match_out_of_range[MAX_MATCH_SHORT + 1];
 106
 107 /* */
 108     long in_len;
 109     long out_len;
 110 }
 111 lzo1a_stats_t;
 112
 113 extern lzo1a_stats_t *lzo1a_stats;
 114
 115
 116
 117 #ifdef __cplusplus
 118 } /* extern "C" */
 119 #endif
 120
 121 #endif /* already included */
 122
 123 /*
 124 vi:ts=4:et
 125 */