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/* Fitsy FITS read and write header routines.
*/
#include <xos.h>
#include "fitsy.h"
FITSHead ft_headread0(file, card1, n)
File file;
char *card1;
size_t n;
{
int nbloks;
FITSHead fits;
FITSCard cards;
FITSCard end;
FITSBuff key;
int match;
int nhist;
if ( file == NULL ) return NULL;
Malloc(cards, FT_BLOCK+1);
ft_cardclr(cards, FT_CARDS);
/* make sure there is a null at the end (EGM) */
((char *)cards)[FT_BLOCK] = '\0';
fits = ft_headinit(cards, -FT_CARDS*FT_CARDLEN);
fits->seek = ftTell(file);
if ( card1 )
memmove(fits->cards, card1, n);
if ( ftRead(file, (void *)&fits->cards[0].c[n],
1, FT_BLOCK - n) != FT_BLOCK - n ) {
(void)Free(fits->cards);
(void)Free(fits);
return NULL;
};
ft_cardkey(&key, "END", 0);
for ( nbloks = 1; 1; nbloks++ ) {
if ( (end = ft_cardfindblok(&fits->cards[(nbloks-1) * FT_CARDS]
, &key, &match, &nhist)) ) break;
if ( (nbloks <= 25) || (nbloks > 25 && nhist < FT_CARDS) ) {
fits->ncard += FT_CARDS;
(void)ReAlloc(fits->cards, (nbloks+1) * FT_BLOCK + 1);
/* make sure there is a null at the end (EGM) */
((char *)fits->cards)[(nbloks+1) * FT_BLOCK] = '\0';
ft_cardclr(&fits->cards[nbloks * FT_CARDS], FT_CARDS);
} else
nbloks--;
if ( ftRead(file, (void *)&fits->cards[nbloks * FT_CARDS],
1, FT_BLOCK) != FT_BLOCK ) {
(void)Free(fits->cards);
(void)Free(fits);
return NULL;
}
}
fits->data = ftTell(file);
fits->ncard = end - fits->cards + 1;
fits->acard = nbloks * FT_CARDS;
ft_syncdata(fits);
return fits;
}
/* Read a FITS header from a file pointer.
Returns
The #FITSHead read from #file.
*/
FITSHead ft_headread(file)
File file; /* File pointer to read or write a FITS header on. */
{
return ft_headread0(file, NULL, 0);
}
/* Write a FITS header to a file pointer.
*/
int ft_headwrite(file, fits)
File file;
FITSHead fits; /* Header to write. */
{
if ( file == NULL ) return 0;
if ( fits == NULL ) return 0;
if ( fits->sync ) ft_synchead(fits);
ftWrite(file, (void *)fits->cards,
FT_BLOCK, ((fits->ncard+FT_CARDS-1)/FT_CARDS));
ftFlush(file);
return 1;
}
void *ft_fileparse(ifile, callback, cdata)
File ifile;
int (*callback)();
void *cdata;
{
FITSHead fits;
void *data = NULL;
if ( ifile == NULL ) return NULL;
while ( (fits = ft_headread(ifile)) ) {
if ( (*callback)(ifile, fits, &data, cdata) )
return data;
}
return data;
}
/* Seek back to the header part of a FITS HDU. The file handle must be the same
one from which the FITS header was read and must be seekable.
*/
off_t ft_headseek(file, fits)
File file;
FITSHead fits;
{
if ( file == NULL ) return -1;
if ( fits == NULL ) return -1;
return ftSeek(file, fits->seek, 0) != -1;
}
int ft_sync(fits, x)
FITSHead fits;
int x;
{
int sync;
if ( fits == NULL ) return -1;
sync = fits->sync;
fits->sync = x;
return sync;
}
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