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/* Copyright (c) 2019, Anthony Latorre <tlatorre at uchicago>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "misc.h"
#include "util.h"
static int initialized = 0;
static double *x, *y;
static size_t size;
static int init()
{
int i;
char line[256];
char *str;
double value;
int n;
FILE *f = open_file("pmt_pcath_response.dat", "r");
if (!f) {
fprintf(stderr, "failed to open pmt_pcath_response.dat: %s\n", strerror(errno));
return -1;
}
i = 0;
n = 0;
/* For the first pass, we just count how many values there are. */
while (fgets(line, sizeof(line), f)) {
size_t len = strlen(line);
if (len && (line[len-1] != '\n')) {
fprintf(stderr, "got incomplete line on line %i: '%s'\n", i, line);
goto err;
}
i += 1;
/* Skip the first 32 lines since it's just a header. */
if (i < 32) continue;
if (!len) continue;
else if (line[0] == '#') continue;
str = strtok(line," \n");
while (str) {
value = strtod(str, NULL);
n += 1;
str = strtok(NULL," \n");
}
}
x = malloc(sizeof(double)*(n+2));
y = malloc(sizeof(double)*(n+2));
size = n + 2;
i = 0;
n = 0;
/* Now, we actually store the values. */
rewind(f);
while (fgets(line, sizeof(line), f)) {
size_t len = strlen(line);
if (len && (line[len-1] != '\n')) {
fprintf(stderr, "got incomplete line on line %i: '%s'\n", i, line);
goto err;
}
i += 1;
/* Skip the first 32 lines since it's just a header. */
if (i < 32) continue;
if (!len) continue;
else if (line[0] == '#') continue;
str = strtok(line," \n");
while (str) {
value = strtod(str, NULL);
/* According to the file, the values are stored for wavelengths
* between 230 and 700 in 1 nm increments. */
x[n+1] = 230 + n*1.0;
y[n+1] = value;
n += 1;
str = strtok(NULL," \n");
}
}
/* Make sure we extrapolate to 0. */
x[0] = x[1] - 1.0;
y[0] = 0;
x[n+1] = x[n] + 1.0;
y[n+1] = 0;
fclose(f);
initialized = 1;
return 0;
err:
fclose(f);
return -1;
}
double get_quantum_efficiency(double wavelength)
{
if (!initialized) {
if (init()) {
exit(1);
}
}
return interp1d(wavelength, x, y, size);
}
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