/usr/include/astrometry/quadfile.h is in libastrometry-dev 0.70+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
#ifndef QUADFILE_H
#define QUADFILE_H
#include <sys/types.h>
#include <stdint.h>
#include "astrometry/qfits_header.h"
#include "astrometry/fitsbin.h"
#include "astrometry/anqfits.h"
typedef struct {
unsigned int numquads;
unsigned int numstars;
int dimquads;
// upper bound of AB distance of quads in this index
double index_scale_upper;
// lower bound
double index_scale_lower;
// unique ID of this index
int indexid;
// healpix covered by this index
int healpix;
// Nside of the healpixelization
int hpnside;
fitsbin_t* fb;
// when reading:
uint32_t* quadarray;
} quadfile_t;
quadfile_t* quadfile_open(const char* fname);
quadfile_t* quadfile_open_fits(anqfits_t* fits);
char* quadfile_get_filename(const quadfile_t* qf);
quadfile_t* quadfile_open_for_writing(const char* quadfname);
quadfile_t* quadfile_open_in_memory(void);
int quadfile_switch_to_reading(quadfile_t* qf);
int quadfile_close(quadfile_t* qf);
// Look at each quad, and ensure that the star ids it contains are all
// less than the number of stars ("numstars"). Returns 0=ok, -1=problem
int quadfile_check(const quadfile_t* qf);
// Copies the star ids of the stars that comprise quad "quadid".
// There will be qf->dimquads such stars.
// (this will be less than starutil.h : DQMAX, for ease of static
// allocation of arrays that will hold quads of stars)
int quadfile_get_stars(const quadfile_t* qf, unsigned int quadid,
unsigned int* stars);
int quadfile_write_quad(quadfile_t* qf, unsigned int* stars);
int quadfile_dimquads(const quadfile_t* qf);
int quadfile_nquads(const quadfile_t* qf);
int quadfile_fix_header(quadfile_t* qf);
int quadfile_write_header(quadfile_t* qf);
double quadfile_get_index_scale_upper_arcsec(const quadfile_t* qf);
double quadfile_get_index_scale_lower_arcsec(const quadfile_t* qf);
qfits_header* quadfile_get_header(const quadfile_t* qf);
int quadfile_write_header_to(quadfile_t* qf, FILE* fid);
int quadfile_write_all_quads_to(quadfile_t* qf, FILE* fid);
#endif
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