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#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "gen.h"
void init_statst(stats_t *data, char do_median)
{
memset(data, 0x00, sizeof(stats_t));
data -> min = MY_DOUBLE_INF;
data -> max = -data -> min;
data -> calc_median = do_median;
}
void uninit_statst(stats_t *data)
{
free(data -> median);
}
void update_statst(stats_t *data, double in)
{
data -> cur = in;
data -> min = min(data -> min, in);
data -> max = max(data -> max, in);
data -> avg += in;
data -> sd += in * in;
data -> valid = 1;
data -> cur_valid = 1;
if (data -> calc_median) {
if (data -> n >= data -> median_size) {
data -> median_size = data -> median_size == 0 ? 128 : data -> median_size * 2;
data -> median = (double *)realloc(data -> median, data -> median_size * sizeof(double));
}
}
if (data -> calc_median)
data -> median[data -> n] = in;
data -> n++;
}
void reset_statst_cur(stats_t *data)
{
data -> cur_valid = 0;
}
double calc_sd(stats_t *in)
{
double avg = 0.0;
if (in -> n == 0 || !in -> valid)
return 0;
avg = in -> avg / (double)in -> n;
return sqrt((in -> sd / (double)in -> n) - pow(avg, 2.0));
}
static int cmpfunc(const void *a, const void *b)
{
if (*(const double *)a > *(const double *)b)
return 1;
if (*(const double *)a < *(const double *)b)
return -1;
return 0;
}
double calc_median(const stats_t *in)
{
int half = in -> n / 2;
if (in -> calc_median == 0)
return -1;
qsort(in -> median, in -> n, sizeof(double), cmpfunc);
if (in -> n & 1)
return in->median[half + 1];
return (in->median[half + 0] + in->median[half + 1]) / 2.;
}
/* Base64 encoding start */
const char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
void encode_tryptique(char source[3], char result[4])
/* Encode 3 char in B64, result give 4 Char */
{
int tryptique, i;
tryptique = source[0];
tryptique *= 256;
tryptique += source[1];
tryptique *= 256;
tryptique += source[2];
for (i=0; i<4; i++)
{
result[3-i] = alphabet[tryptique%64];
tryptique /= 64;
}
}
int enc_b64(char *source, int source_lenght, char *target)
{
/* Divide string /3 and encode trio */
while (source_lenght >= 3) {
encode_tryptique(source, target);
source_lenght -= 3;
source += 3;
target += 4;
}
/* Add padding to the rest */
if (source_lenght > 0) {
char pad[3];
memset(pad, 0, sizeof pad);
memcpy(pad, source, source_lenght);
encode_tryptique(pad, target);
target[3] = '=';
if (source_lenght == 1) target[2] = '=';
target += 4;
}
target[0] = 0;
return 1;
}
/* Base64 encoding END */
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