diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/lib/ndpi_analyze.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/src/lib/ndpi_analyze.c b/src/lib/ndpi_analyze.c index 346e65a48..5cd901c75 100644 --- a/src/lib/ndpi_analyze.c +++ b/src/lib/ndpi_analyze.c @@ -1,7 +1,7 @@ /* * ndpi_analyze.c * - * Copyright (C) 2019-22 - ntop.org + * Copyright (C) 2019-23 - ntop.org and contributors * * This file is part of nDPI, an open source deep packet inspection * library. @@ -127,8 +127,9 @@ void ndpi_data_add_value(struct ndpi_analyze_struct *s, const u_int32_t value) { /* Compute the average on all values */ float ndpi_data_average(struct ndpi_analyze_struct *s) { - if(!s) + if((!s) || (s->num_data_entries == 0)) return(0); + return((s->num_data_entries == 0) ? 0 : ((float)s->sum_total / (float)s->num_data_entries)); } @@ -154,7 +155,9 @@ u_int32_t ndpi_data_max(struct ndpi_analyze_struct *s) { return(s ? s->max_val : float ndpi_data_variance(struct ndpi_analyze_struct *s) { if(!s) return(0); - float v = s->num_data_entries ? ((float)s->stddev.sum_square_total - ((float)s->sum_total * (float)s->sum_total / (float)s->num_data_entries)) / (float)s->num_data_entries : 0.0; + float v = s->num_data_entries ? + ((float)s->stddev.sum_square_total - ((float)s->sum_total * (float)s->sum_total / (float)s->num_data_entries)) / (float)s->num_data_entries : 0.0; + return((v < 0 /* rounding problem */) ? 0 : v); } @@ -226,7 +229,7 @@ float ndpi_data_window_stddev(struct ndpi_analyze_struct *s) { return(sqrt(ndpi_data_window_variance(s))); } - /* ********************************************************************************* */ +/* ********************************************************************************* */ /* Compute entropy on the last sliding window values |