gadget2conv.h

#ifndef GADGET2CONV_H
#define GADGET2CONV_H

#include<stdio.h>
#include<stdlib.h>
#include <string.h>
#include <math.h>

struct io_header_1
{
  int      npart[6];
  double   mass[6];
  double   time;
  double   redshift;
  int      flag_sfr;
  int      flag_feedback;
  int      npartTotal[6];
  int      flag_cooling;
  int      num_files;
  double   BoxSize;
  double   Omega0;
  double   OmegaLambda;
  double   HubbleParam; 
  char     fill[256- 6*4- 6*8- 2*8- 2*4- 6*4- 2*4 - 4*8];  /* fills to 256 Bytes */
};

struct io_header {
  unsigned int npart[6];                        /*!< number of particles of each type in this file */
  double mass[6];                      /*!< mass of particles of each type. If 0, then the masses are explicitly
                                            stored in the mass-block of the snapshot file, otherwise they are omitted */
  double time;                         /*!< time of snapshot file */
  double redshift;                     /*!< redshift of snapshot file */
  int flag_sfr;                        /*!< flags whether the simulation was including star formation */
  int flag_feedback;                   /*!< flags whether feedback was included (obsolete) */
  int npartTotal[6];          /*!< total number of particles of each type in this snapshot. This can be
                                            different from npart if one is dealing with a multi-file snapshot. */
  int flag_cooling;                    /*!< flags whether cooling was included  */
  int num_files;                       /*!< number of files in multi-file snapshot */
  double BoxSize;                      /*!< box-size of simulation in case periodic boundaries were used */
  double Omega0;                       /*!< matter density in units of critical density */
  double OmegaLambda;                  /*!< cosmological constant parameter */
  double HubbleParam;                  /*!< Hubble parameter in units of 100 km/sec/Mpc */
  int flag_stellarage;                 /*!< flags whether the file contains formation times of star particles */
  int flag_metals;                     /*!< flags whether the file contains metallicity values for gas and star particles */
  unsigned int npartTotalHighWord[6];  /*!< High word of the total number of particles of each type */
  int  flag_entropy_instead_u;         /*!< flags that IC-file contains entropy instead of u */
  char fill[60];	               /*!< fills to 256 Bytes */
 } header;  
 
 struct Particle
{
	float Pos[3]; /* The position of the particle after the n'th timestep */
	float Vel[3];
	float Mass;

	unsigned int ID;
};

void WriteGadget2( struct Particle *,int , char *);

#endif