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/* Fitsy FITS routines to work with the data portion of a FITS file.
*/
#include <xos.h>
#include "fitsy.h"
/* Skip over the data part of a FITS header data unit.
If the file is seekable and the #ofile file pointer is
#NULL or nfile is 0, the data are skipped with an #fseek().
If the #ofile file pointer is #NULL no data is written.
*/
#define NBLOCK 500
off_t ft_dataskip(ifile, fits, ofiles, nofile)
File ifile; /* File pointer to read FITS data from. */
FITSHead fits; /* FITS header associated with data. */
File* ofiles; /* File pointers to write data to. */
int nofile; /* number of files */
{
int i;
int blocks;
char block[FT_BLOCK * NBLOCK];
off_t pos=0;
if ( ifile == NULL ) return pos;
if ( fits == NULL ) return pos;
if ( ft_seek(fits) != -1 && (!ofiles || !nofile) ) {
if ( ft_databytes(fits) ){
pos = ftSeek(ifile, ft_databloks(fits) * FT_BLOCK, 1);
return pos;
}
}
if ( ft_databytes(fits) ) {
for ( blocks = ft_databloks(fits);
blocks > NBLOCK; blocks -= NBLOCK ) {
ftRead(ifile, block, 1, FT_BLOCK*NBLOCK);
for(i=0; i<nofile; i++)
ftWrite(ofiles[i], block, 1, FT_BLOCK*NBLOCK);
}
if ( blocks ) {
ftRead(ifile, block, 1, FT_BLOCK*blocks);
for(i=0; i<nofile; i++)
ftWrite(ofiles[i], block, 1, FT_BLOCK*blocks);
}
}
return pos;
}
/* Seek to the data portion of prevoiusly read fits header data unit.
*/
off_t ft_dataseek(sfile, fits)
File sfile; /* File pointer to seek. */
FITSHead fits;
{
if ( sfile == NULL ) return -1;
if ( fits == NULL ) return -1;
return ftSeek(sfile, fits->data, 0) != -1;
}
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