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