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#ifndef GMX_FILEIO_XTCIO_H
#define GMX_FILEIO_XTCIO_H

#include "gromacs/math/vectypes.h"
#include "gromacs/utility/basedefinitions.h"
#include "gromacs/utility/real.h"

#ifdef __cplusplus
extern "C" {
#endif

struct t_fileio;

/* All functions return 1 if successful, 0 otherwise
 * bOK tells if a frame is not corrupted
 */

/* Note that XTC was implemented to use xdr_int for the step number,
 * which is defined by the standard to be signed and 32 bit. We didn't
 * design the format to be extensible, so we can't fix the fact that
 * after 2^31 frames, step numbers will wrap to be
 * negative. Fortunately, this tends not to cause serious problems,
 * and we've fixed it in TNG. */

struct t_fileio *open_xtc(const char *filename, const char *mode);
/* Open a file for xdr I/O */

void close_xtc(struct t_fileio *fio);
/* Close the file for xdr I/O */

int read_first_xtc(struct t_fileio *fio,
                   int *natoms, gmx_int64_t *step, real *time,
                   matrix box, rvec **x, real *prec, gmx_bool *bOK);
/* Open xtc file, read xtc file first time, allocate memory for x */

int read_next_xtc(struct t_fileio *fio,
                  int natoms, gmx_int64_t *step, real *time,
                  matrix box, rvec *x, real *prec, gmx_bool *bOK);
/* Read subsequent frames */

int write_xtc(struct t_fileio *fio,
              int natoms, gmx_int64_t step, real time,
              const rvec *box, const rvec *x, real prec);
/* Write a frame to xtc file */

#ifdef __cplusplus
}
#endif

#endif
