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/*
# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
// DEBUG
#include <sys/mman.h>
#include "anqfits.h"
#include "ioutils.h"
#include "fitsioutils.h"
#include "permutedsort.h"
#include "an-bool.h"
#include "fitstable.h"
#include "errors.h"
#include "log.h"
#include "an-bool.h"
int resort_xylist(const char* infn, const char* outfn,
const char* fluxcol, const char* backcol,
int ascending) {
FILE* fin = NULL;
FILE* fout = NULL;
double *flux = NULL, *back = NULL;
int *perm1 = NULL, *perm2 = NULL;
anbool *used = NULL;
int start, size, nextens, ext;
int (*compare)(const void*, const void*);
fitstable_t* tab = NULL;
anqfits_t* anq = NULL;
if (ascending)
compare = compare_doubles_asc;
else
compare = compare_doubles_desc;
if (!fluxcol)
fluxcol = "FLUX";
if (!backcol)
backcol = "BACKGROUND";
fin = fopen(infn, "rb");
if (!fin) {
SYSERROR("Failed to open input file %s", infn);
return -1;
}
fout = fopen(outfn, "wb");
if (!fout) {
SYSERROR("Failed to open output file %s", outfn);
goto bailout;
}
// copy the main header exactly.
anq = anqfits_open(infn);
if (!anq) {
ERROR("Failed to open file \"%s\"", infn);
goto bailout;
}
start = anqfits_header_start(anq, 0);
size = anqfits_header_size (anq, 0);
if (pipe_file_offset(fin, start, size, fout)) {
ERROR("Failed to copy primary FITS header.");
goto bailout;
}
nextens = anqfits_n_ext(anq);
tab = fitstable_open(infn);
if (!tab) {
ERROR("Failed to open FITS table in file %s", infn);
goto bailout;
}
for (ext=1; ext<nextens; ext++) {
int hdrstart, hdrsize, datstart;
int i, N;
int rowsize;
hdrstart = anqfits_header_start(anq, ext);
hdrsize = anqfits_header_size (anq, ext);
datstart = anqfits_data_start (anq, ext);
if (!anqfits_is_table(anq, ext)) {
ERROR("Extension %i isn't a table. Skipping", ext);
continue;
}
// Copy the header as-is.
if (pipe_file_offset(fin, hdrstart, hdrsize, fout)) {
ERROR("Failed to copy the header of extension %i", ext);
goto bailout;
}
if (fitstable_read_extension(tab, ext)) {
ERROR("Failed to read FITS table from extension %i", ext);
goto bailout;
}
rowsize = fitstable_row_size(tab);
// read FLUX column as doubles.
flux = fitstable_read_column(tab, fluxcol, TFITS_BIN_TYPE_D);
if (!flux) {
ERROR("Failed to read FLUX column from extension %i", ext);
goto bailout;
}
// BACKGROUND
back = fitstable_read_column(tab, backcol, TFITS_BIN_TYPE_D);
if (!back) {
ERROR("Failed to read BACKGROUND column from extension %i", ext);
goto bailout;
}
N = fitstable_nrows(tab);
debug("First rows of input table:\n");
for (i=0; i<MIN(10, N); i++)
debug("flux %g, background %g\n", flux[i], back[i]);
// set back = flux + back (ie, non-background-subtracted flux)
for (i=0; i<N; i++)
back[i] += flux[i];
// Sort by flux...
perm1 = permuted_sort(flux, sizeof(double), compare, NULL, N);
// Sort by non-background-subtracted flux...
perm2 = permuted_sort(back, sizeof(double), compare, NULL, N);
used = malloc(N * sizeof(anbool));
memset(used, 0, N * sizeof(anbool));
// Check sort...
for (i=0; i<N-1; i++) {
if (ascending) {
assert(flux[perm1[i]] <= flux[perm1[i+1]]);
assert(back[perm2[i]] <= back[perm2[i+1]]);
} else {
assert(flux[perm1[i]] >= flux[perm1[i+1]]);
assert(back[perm2[i]] >= back[perm2[i+1]]);
}
}
for (i=0; i<N; i++) {
int j;
int inds[] = { perm1[i], perm2[i] };
for (j=0; j<2; j++) {
int index = inds[j];
assert(index < N);
if (used[index])
continue;
used[index] = TRUE;
debug("adding index %i: %s %g\n", index, j==0 ? "flux" : "bgsub", j==0 ? flux[index] : back[index]);
if (pipe_file_offset(fin, datstart + index * rowsize, rowsize, fout)) {
ERROR("Failed to copy row %i", index);
goto bailout;
}
}
}
for (i=0; i<N; i++)
assert(used[i]);
if (fits_pad_file(fout)) {
ERROR("Failed to add padding to extension %i", ext);
goto bailout;
}
free(flux);
flux = NULL;
free(back);
back = NULL;
free(perm1);
perm1 = NULL;
free(perm2);
perm2 = NULL;
free(used);
used = NULL;
}
fitstable_close(tab);
tab = NULL;
if (fclose(fout)) {
SYSERROR("Failed to close output file %s", outfn);
return -1;
}
fclose(fin);
return 0;
bailout:
if (tab)
fitstable_close(tab);
if (fout)
fclose(fout);
if (fin)
fclose(fin);
free(flux);
free(back);
free(perm1);
free(perm2);
free(used);
return -1;
}
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