/******************************************************************************/
/* Peter Kirchgessner */
/* e-mail: peter@kirchgessner.net */
/* WWW : http://www.kirchgessner.net */
/******************************************************************************/
/* #BEG-HDR */
/* */
/* Package : FITS reading/writing library */
/* Modul-Name : fitsrw.c */
/* Description : Support of reading/writing FITS-files */
/* Function(s) : fits_new_filestruct - (local) initialize file structure*/
/* fits_new_hdulist - (local) initialize hdulist struct*/
/* fits_delete_filestruct - (local) delete file structure */
/* fits_delete_recordlist - (local) delete record list */
/* fits_delete_hdulist - (local) delete hdu list */
/* fits_nan_32 - (local) check IEEE NaN values */
/* fits_nan_64 - (local) check IEEE NaN values */
/* fits_get_error - get error message */
/* fits_set_error - (local) set error message */
/* fits_drop_error - (local) remove an error message */
/* fits_open - open a FITS file */
/* fits_close - close a FITS file */
/* fits_add_hdu - add a HDU to a FITS file */
/* fits_add_card - add a card to the HDU */
/* fits_print_header - print a single FITS header */
/* fits_read_header - (local) read in FITS header */
/* fits_write_header - write a FITS header */
/* fits_decode_header - (local) decode a header */
/* fits_eval_pixrange - (local) evaluate range of pixels */
/* fits_decode_card - decode a card */
/* fits_search_card - search a card in a record list */
/* fits_image_info - get information about image */
/* fits_seek_image - position to an image */
/* fits_read_pixel - read pixel values from file */
/* fits_to_pgmraw - convert FITS-file to PGM-file */
/* pgmraw_to_fits - convert PGM-file to FITS-file */
/* */
/* Author : P. Kirchgessner */
/* Date of Gen. : 12-Apr-97 */
/* Last modified : 25-Aug-06 */
/* Version : 0.12 */
/* Compiler Opt. : */
/* Changes : */
/* #MOD-0001, nn, 20-Dec-97, Initialize some variables */
/* #MOD-0002, pk, 16-Aug-06, Fix problems with internationalization */
/* */
/* #END-HDR */
/******************************************************************************/
/* References: */
/* - NOST, Definition of the Flexible Image Transport System (FITS), */
/* September 29, 1995, Standard, NOST 100-1.1 */
/* (ftp://nssdc.gsfc.nasa.gov/pub/fits/fits_standard_ps.Z) */
/* - The FITS IMAGE Extension. A Proposal. J.D. Ponz, R.W. Thompson, */
/* J.R. Munoz, Feb. 7, 1992 */
/* (ftp://www.cv.nrao.edu/fits/documents/standards/image.ps.gz) */
/* */
/******************************************************************************/
#define VERSIO 0.12
/******************************************************************************/
/* FITS reading/writing library */
/* Copyright (C) 1997 Peter Kirchgessner */
/* (email: peter@kirchgessner.net, WWW: http://www.kirchgessner.net) */
/* The library was developed for a FITS-plug-in to GIMP, the GNU Image */
/* Manipulation Program. But it is completely independent to that (beside use */
/* of glib). If someone finds it useful for other purposes, try to keep it */
/* independent from your application. */
/******************************************************************************/
/* */
/* This program is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation; either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program. If not, see . */
/******************************************************************************/
#include "config.h"
#include
#include
#include
#include
#include
#include "fits-io.h"
/* Declaration of local functions */
static FitsFile * fits_new_filestruct (void);
static FitsHduList * fits_new_hdulist (void);
static void fits_delete_filestruct (FitsFile *ff);
static void fits_delete_recordlist (FitsRecordList *rl);
static void fits_delete_hdulist (FitsHduList *hl);
static gint fits_nan_32 (guchar *value);
static gint fits_nan_64 (guchar *value);
static void fits_set_error (const char *errmsg);
static void fits_drop_error (void);
static FitsRecordList * fits_read_header (FILE *fp,
gint *nrec);
static FitsHduList * fits_decode_header (FitsRecordList *hdr,
glong hdr_offset,
glong dat_offset);
static gint fits_eval_pixrange (FILE *fp,
FitsHduList *hdu);
/* Error handling like a FIFO */
#define FITS_MAX_ERROR 16
#define FITS_ERROR_LENGTH 256
static gint fits_n_error = 0;
static gchar fits_error[FITS_MAX_ERROR][FITS_ERROR_LENGTH];
/* What byte ordering for IEEE-format we are running on ? */
static gint fits_ieee32_intel = 0;
static gint fits_ieee32_motorola = 0;
static gint fits_ieee64_intel = 0;
static gint fits_ieee64_motorola = 0;
/* Macros */
#define FITS_RETURN(msg, val) { fits_set_error (msg); return (val); }
#define FITS_VRETURN(msg) { fits_set_error (msg); return; }
/* Get pixel values from memory. p must be an (guchar *) */
#define FITS_GETBITPIX16(p,val) val = ((p[0] << 8) | (p[1]))
#define FITS_GETBITPIX32(p,val) val = \
((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
/* Get floating point values from memory. p must be an (guchar *). */
/* The floating point values must directly correspond */
/* to machine representation. Otherwise it does not work. */
#define FITS_GETBITPIXM32(p,val) \
{ if (fits_ieee32_intel) {guchar uc[4]; \
uc[0] = p[3]; uc[1] = p[2]; uc[2] = p[1]; uc[3] = p[0]; \
val = *(FitsBitpixM32 *)uc; } \
else if (fits_ieee32_motorola) { val = *(FitsBitpixM32 *)p; } \
else if (fits_ieee64_motorola) {FitsBitpixM64 m64; \
guchar *uc= (guchar *)&m64; \
uc[0]=p[0]; uc[1]=p[1]; uc[2]=p[2]; uc[3]=p[3]; uc[4]=uc[5]=uc[6]=uc[7]=0; \
val = (FitsBitpixM32)m64; } \
else if (fits_ieee64_intel) {FitsBitpixM64 i64; \
guchar *uc= (guchar *)&i64; \
uc[0]=uc[1]=uc[2]=uc[3]=0; uc[7]=p[0]; uc[6]=p[1]; uc[5]=p[2]; uc[4]=p[3]; \
val = (FitsBitpixM32)i64;} }
#define FITS_GETBITPIXM64(p,val) \
{ if (fits_ieee64_intel) {guchar uc[8]; \
uc[0] = p[7]; uc[1] = p[6]; uc[2] = p[5]; uc[3] = p[4]; \
uc[4] = p[3]; uc[5] = p[2]; uc[6] = p[1]; uc[7] = p[0]; \
val = *(FitsBitpixM64 *)uc; } else val = *(FitsBitpixM64 *)p; }
#define FITS_WRITE_BOOLCARD(fp,key,value) \
{ gchar card[81]; \
g_snprintf (card, sizeof (card), \
"%-8.8s= %20s%50s", key, value ? "T" : "F", " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_LONGCARD(fp,key,value) \
{ gchar card[81]; \
g_snprintf (card, sizeof (card), \
"%-8.8s= %20ld%50s", key, (long)value, " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_DOUBLECARD(fp,key,value) \
{ gchar card[81], dbl[21], *istr; \
g_ascii_dtostr (dbl, sizeof(dbl), (gdouble)value); \
istr = strstr (dbl, "e"); \
if (istr) *istr = 'E'; \
g_snprintf (card, sizeof (card), \
"%-8.8s= %20.20s%50s", key, dbl, " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_STRINGCARD(fp,key,value) \
{ gchar card[81]; int k;\
g_snprintf (card, sizeof (card), \
"%-8.8s= \'%s", key, value); \
for (k = strlen (card); k < 81; k++) card[k] = ' '; \
k = strlen (key); if (k < 8) card[19] = '\''; else card[11+k] = '\''; \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_CARD(fp,value) \
{ gchar card[81]; \
g_snprintf (card, sizeof (card), \
"%-80.80s", value); \
fwrite (card, 1, 80, fp); }
/* Macro to convert a double value to a string using '.' as decimal point */
#define FDTOSTR(buf,val) g_ascii_dtostr (buf, sizeof(buf), (gdouble)(val))
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_scanfdouble - (local) scan a string for a double value */
/* */
/* Parameters: */
/* const char *buf [I] : the string to scan */
/* double *value [O] : where to write the double value to */
/* */
/* Scan a string for a double value represented in "C" locale. */
/* On success 1 is returned. On failure 0 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static gboolean
fits_scanfdouble (const gchar *buf,
gdouble *value)
{
gboolean retval = FALSE;
gchar *bufcopy = g_strdup (buf);
/* We should use g_ascii_strtod. This also allows scanning of hexadecimal */
/* values like 0x02. But we want the behaviour of sscanf ("0x02","%lf",...*/
/* that gives 0.0 in this case. So check the string if we have a hex-value*/
if (bufcopy)
{
gchar *bufptr = bufcopy;
/* Remove leading white space */
g_strchug (bufcopy);
/* Skip leading sign character */
if ((*bufptr == '-') || (*bufptr == '+'))
bufptr++;
/* Start of hex value ? Take this as 0.0 */
if ((bufptr[0] == '0') && (g_ascii_toupper (bufptr[1]) == 'X'))
{
*value = 0.0;
retval = TRUE;
}
else
{
if (*bufptr == '.') /* leading decimal point ? Skip it */
bufptr++;
if (g_ascii_isdigit (*bufptr)) /* Expect the complete string is decimal */
{
gchar *endptr;
gdouble gvalue = g_ascii_strtod (bufcopy, &endptr);
if (errno == 0)
{
*value = gvalue;
retval = TRUE;
}
}
}
g_free (bufcopy);
}
return retval;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_new_filestruct - (local) initialize file structure */
/* */
/* Parameters: */
/* -none- */
/* */
/* Returns a pointer to an initialized fits file structure. */
/* On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static FitsFile *
fits_new_filestruct (void)
{
return g_new0 (FitsFile, 1);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_new_hdulist - (local) initialize hdulist structure */
/* */
/* Parameters: */
/* -none- */
/* */
/* Returns a pointer to an initialized hdulist structure. */
/* On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static FitsHduList *
fits_new_hdulist (void)
{
return g_new0 (FitsHduList, 1);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_filestruct - (local) delete file structure */
/* */
/* Parameters: */
/* FitsFile *ff [I] : pointer to fits file structure */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Frees all memory allocated by the file structure. */
/* */
/* #END-PAR */
/*****************************************************************************/
static void
fits_delete_filestruct (FitsFile *ff)
{
if (ff == NULL)
return;
fits_delete_hdulist (ff->hdu_list);
ff->hdu_list = NULL;
g_free (ff);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_recordlist - (local) delete record list */
/* */
/* Parameters: */
/* FitsRecordList *rl [I] : record list to delete */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
static void
fits_delete_recordlist (FitsRecordList *rl)
{
while (rl != NULL)
{
FitsRecordList *next;
next = rl->next_record;
rl->next_record = NULL;
g_free (rl);
rl = next;
}
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_hdulist - (local) delete hdu list */
/* */
/* Parameters: */
/* FitsHduList *hl [I] : hdu list to delete */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
static void
fits_delete_hdulist (FitsHduList *hl)
{
while (hl != NULL)
{
FitsHduList *next;
fits_delete_recordlist (hl->header_record_list);
next = hl->next_hdu;
hl->next_hdu = NULL;
g_free (hl);
hl = next;
}
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_nan_32 - (local) check for IEEE NaN values (32 bit) */
/* */
/* Parameters: */
/* unsigned char *v [I] : value to check */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function returns 1 if the value is a NaN. Otherwise 0 is returned. */
/* The byte sequence at v must start with the sign/eponent byte. */
/* */
/* #END-PAR */
/*****************************************************************************/
static int
fits_nan_32 (guchar *v)
{
register gulong k;
k = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | v[3];
k &= 0x7fffffff; /* Don't care about the sign bit */
/* See NOST Definition of the Flexible Image Transport System (FITS), */
/* Appendix F, IEEE special formats. */
return (((k >= 0x7f7fffff) && (k <= 0x7fffffff)) ||
((k >= 0x00000001) && (k <= 0x00800000)));
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_nan_64 - (local) check for IEEE NaN values (64 bit) */
/* */
/* Parameters: */
/* unsigned char *v [I] : value to check */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function returns 1 if the value is a NaN. Otherwise 0 is returned. */
/* The byte sequence at v must start with the sign/eponent byte. */
/* (currently we ignore the low order 4 bytes of the mantissa. Therefore */
/* this function is the same as for 32 bits). */
/* */
/* #END-PAR */
/*****************************************************************************/
static int
fits_nan_64 (guchar *v)
{
register gulong k;
k = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | v[3];
k &= 0x7fffffff; /* Don't care about the sign bit */
/* See NOST Definition of the Flexible Image Transport System (FITS), */
/* Appendix F, IEEE special formats. */
return (((k >= 0x7f7fffff) && (k <= 0x7fffffff)) ||
((k >= 0x00000001) && (k <= 0x00800000)));
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_get_error - get an error message */
/* */
/* Parameters: */
/* -none- */
/* */
/* If an error message has been set, a pointer to the message is returned. */
/* Otherwise a NULL pointer is returned. */
/* An inquired error message is removed from the error FIFO. */
/* */
/* #END-PAR */
/*****************************************************************************/
gchar *
fits_get_error (void)
{
static gchar errmsg[FITS_ERROR_LENGTH];
gint k;
if (fits_n_error <= 0)
return NULL;
strcpy (errmsg, fits_error[0]);
for (k = 1; k < fits_n_error; k++)
strcpy (fits_error[k-1], fits_error[k]);
fits_n_error--;
return errmsg;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_set_error - (local) set an error message */
/* */
/* Parameters: */
/* char *errmsg [I] : Error message to set */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Places the error message in the FIFO. If the FIFO is full, */
/* the message is discarded. */
/* */
/* #END-PAR */
/*****************************************************************************/
static void
fits_set_error (const gchar *errmsg)
{
if (fits_n_error < FITS_MAX_ERROR)
{
strncpy (fits_error[fits_n_error], errmsg, FITS_ERROR_LENGTH);
fits_error[fits_n_error++][FITS_ERROR_LENGTH-1] = '\0';
}
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_drop_error - (local) remove an error message */
/* */
/* Parameters: */
/* -none- */
/* */
/* Removes the last error message from the error message FIFO */
/* */
/* #END-PAR */
/*****************************************************************************/
static void
fits_drop_error (void)
{
if (fits_n_error > 0)
fits_n_error--;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_open - open a FITS file */
/* */
/* Parameters: */
/* char *filename [I] : name of file to open */
/* char *openmode [I] : mode to open the file ("r", "w") */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* On success, a FitsFile-pointer is returned. On failure, a NULL- */
/* pointer is returned. */
/* The functions scans through the file loading each header and analyzing */
/* them. */
/* */
/* #END-PAR */
/*****************************************************************************/
FitsFile *
fits_open (const gchar *filename,
const gchar *openmode)
{
gint reading, writing, n_rec, n_hdr;
glong fpos_header, fpos_data;
FILE *fp;
FitsFile *ff;
FitsRecordList *hdrlist;
FitsHduList *hdulist = NULL;
FitsHduList *last_hdulist = NULL;
/* Check the IEEE-format we are running on */
{
gfloat one32 = 1.0;
gdouble one64 = 1.0;
guchar *op32 = (guchar *) &one32;
guchar *op64 = (guchar *) &one64;
if (sizeof (float) == 4)
{
fits_ieee32_intel = (op32[3] == 0x3f);
fits_ieee32_motorola = (op32[0] == 0x3f);
}
if (sizeof (double) == 8)
{
fits_ieee64_intel = (op64[7] == 0x3f);
fits_ieee64_motorola = (op64[0] == 0x3f);
}
}
if ((filename == NULL) || (*filename == '\0') || (openmode == NULL))
FITS_RETURN ("fits_open: Invalid parameters", NULL);
reading = (strcmp (openmode, "r") == 0);
writing = (strcmp (openmode, "w") == 0);
if ((!reading) && (!writing))
FITS_RETURN ("fits_open: Invalid openmode", NULL);
fp = g_fopen (filename, reading ? "rb" : "wb");
if (fp == NULL)
FITS_RETURN ("fits_open: fopen() failed", NULL);
ff = fits_new_filestruct ();
if (ff == NULL)
{
fclose (fp);
FITS_RETURN ("fits_open: No more memory", NULL);
}
ff->fp = fp;
ff->openmode = *openmode;
if (writing)
return ff;
for (n_hdr = 0; ; n_hdr++) /* Read through all HDUs */
{
fpos_header = ftell (fp); /* Save file position of header */
hdrlist = fits_read_header (fp, &n_rec);
if (hdrlist == NULL)
{
if (n_hdr > 0) /* At least one header must be present. */
fits_drop_error (); /* If we got a header already, drop the error */
break;
}
fpos_data = ftell (fp); /* Save file position of data */
/* Decode the header */
hdulist = fits_decode_header (hdrlist, fpos_header, fpos_data);
if (hdulist == NULL)
{
fits_delete_recordlist (hdrlist);
break;
}
ff->n_hdu++;
ff->n_pic += hdulist->numpic;
if (hdulist->used.blank_value)
ff->blank_used = TRUE;
if (hdulist->used.nan_value)
ff->nan_used = TRUE;
if (n_hdr == 0)
ff->hdu_list = hdulist;
else
last_hdulist->next_hdu = hdulist;
last_hdulist = hdulist;
/* Evaluate the range of pixel data */
fits_eval_pixrange (fp, hdulist);
/* Reposition to start of next header */
if (fseek (fp, hdulist->data_offset + hdulist->data_size, SEEK_SET) < 0)
break;
}
return ff;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_close - close a FITS file */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS file pointer */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
void
fits_close (FitsFile *ff)
{
if (ff == NULL)
FITS_VRETURN ("fits_close: Invalid parameter");
fclose (ff->fp);
fits_delete_filestruct (ff);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_add_hdu - add a HDU to the file */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS file pointer */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Adds a new HDU to the list kept in ff. A pointer to the new HDU is */
/* returned. On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
FitsHduList *
fits_add_hdu (FitsFile *ff)
{
FitsHduList *newhdu, *hdu;
if (ff->openmode != 'w')
FITS_RETURN ("fits_add_hdu: file not open for writing", NULL);
newhdu = fits_new_hdulist ();
if (newhdu == NULL)
return NULL;
if (ff->hdu_list == NULL)
{
ff->hdu_list = newhdu;
}
else
{
hdu = ff->hdu_list;
while (hdu->next_hdu != NULL)
hdu = hdu->next_hdu;
hdu->next_hdu = newhdu;
}
return newhdu;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_add_card - add a card to the HDU */
/* */
/* Parameters: */
/* FitsHduList *hdulist [I] : HDU listr */
/* char *card [I] : card to add */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The card must follow the standards of FITS. The card must not use a */
/* keyword that is written using *hdulist itself. On success 0 is returned. */
/* On failure -1 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
gint
fits_add_card (FitsHduList *hdulist,
const gchar *card)
{
gint k;
if (hdulist->naddcards >= FITS_NADD_CARDS)
return -1;
k = strlen (card);
if (k < FITS_CARD_SIZE)
{
memset (&(hdulist->addcards[hdulist->naddcards][k]), ' ',
FITS_CARD_SIZE - k);
memcpy (hdulist->addcards[(hdulist->naddcards)++], card, k);
}
else
{
memcpy (hdulist->addcards[(hdulist->naddcards)++], card, FITS_CARD_SIZE);
}
return 0;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_print_header - print the internal representation */
/* of a single header */
/* Parameters: */
/* FitsHduList *hdr [I] : pointer to the header */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
void
fits_print_header (FitsHduList *hdr)
{
gint k;
gchar buf[G_ASCII_DTOSTR_BUF_SIZE];
if (hdr->used.simple)
printf ("Content of SIMPLE-header:\n");
else
printf ("Content of XTENSION-header %s:\n", hdr->xtension);
printf ("header_offset : %ld\n", hdr->header_offset);
printf ("data_offset : %ld\n", hdr->data_offset);
printf ("data_size : %ld\n", hdr->data_size);
printf ("used data_size: %ld\n", hdr->udata_size);
printf ("bytes p.pixel : %d\n", hdr->bpp);
printf ("pixmin : %s\n", FDTOSTR (buf, hdr->pixmin));
printf ("pixmax : %s\n", FDTOSTR (buf, hdr->pixmax));
printf ("naxis : %d\n", hdr->naxis);
for (k = 1; k <= hdr->naxis; k++)
printf ("naxis%-3d : %d\n", k, hdr->naxisn[k-1]);
printf ("bitpix : %d\n", hdr->bitpix);
if (hdr->used.blank)
printf ("blank : %ld\n", hdr->blank);
else
printf ("blank : not used\n");
if (hdr->used.datamin)
printf ("datamin : %s\n", FDTOSTR (buf, hdr->datamin));
else
printf ("datamin : not used\n");
if (hdr->used.datamax)
printf ("datamax : %s\n", FDTOSTR (buf, hdr->datamax));
else
printf ("datamax : not used\n");
if (hdr->used.gcount)
printf ("gcount : %ld\n", hdr->gcount);
else
printf ("gcount : not used\n");
if (hdr->used.pcount)
printf ("pcount : %ld\n", hdr->pcount);
else
printf ("pcount : not used\n");
if (hdr->used.bscale)
printf ("bscale : %s\n", FDTOSTR (buf, hdr->bscale));
else
printf ("bscale : not used\n");
if (hdr->used.bzero)
printf ("bzero : %s\n", FDTOSTR (buf, hdr->bzero));
else
printf ("bzero : not used\n");
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_read_header - (local) read FITS header */
/* */
/* Parameters: */
/* FILE *fp [I] : file pointer */
/* int *nrec [O] : number of records read */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Reads in all header records up to the record that keeps the END-card. */
/* A pointer to the record list is returned on success. */
/* On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static FitsRecordList *
fits_read_header (FILE *fp,
gint *nrec)
{
gchar record[FITS_RECORD_SIZE];
FitsRecordList *start_list = NULL;
FitsRecordList *cu_record = NULL;
FitsRecordList *new_record;
FitsData *fdat;
gint k, simple, xtension;
*nrec = 0;
k = fread (record, 1, FITS_RECORD_SIZE, fp);
if (k != FITS_RECORD_SIZE)
FITS_RETURN ("fits_read_header: Error in read of first record", NULL);
simple = (strncmp (record, "SIMPLE ", 8) == 0);
xtension = (strncmp (record, "XTENSION", 8) == 0);
if ((!simple) && (!xtension))
FITS_RETURN ("fits_read_header: Missing keyword SIMPLE or XTENSION", NULL);
if (simple)
{
fdat = fits_decode_card (record, FITS_DATA_TYPE_FBOOL);
if (fdat && !fdat->fbool)
fits_set_error ("fits_read_header (warning): keyword SIMPLE does not "
"have value T");
}
for (;;) /* Process all header records */
{
new_record = g_new0 (FitsRecordList, 1);
memcpy (new_record->data, record, FITS_RECORD_SIZE);
new_record->next_record = NULL;
(*nrec)++;
if (start_list == NULL) /* Add new record to the list */
start_list = new_record;
else
cu_record->next_record = new_record;
cu_record = new_record;
/* Was this the last record ? */
if (fits_search_card (cu_record, "END") != NULL)
break;
k = fread (record, 1, FITS_RECORD_SIZE, fp);
if (k != FITS_RECORD_SIZE)
FITS_RETURN ("fits_read_header: Error in read of record", NULL);
}
return start_list;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_write_header - write a FITS header */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS-file pointer */
/* FitsHduList [I] : pointer to header */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Writes a header to the file. On success, 0 is returned. On failure, */
/* -1 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
gint
fits_write_header (FitsFile *ff,
FitsHduList *hdulist)
{
gint numcards;
gint k;
if (ff->openmode != 'w')
FITS_RETURN ("fits_write_header: file not open for writing", -1);
numcards = 0;
if (hdulist->used.simple)
{
FITS_WRITE_BOOLCARD (ff->fp, "SIMPLE", 1);
numcards++;
}
else if (hdulist->used.xtension)
{
FITS_WRITE_STRINGCARD (ff->fp, "XTENSION", hdulist->xtension);
numcards++;
}
FITS_WRITE_LONGCARD (ff->fp, "BITPIX", hdulist->bitpix);
numcards++;
FITS_WRITE_LONGCARD (ff->fp, "NAXIS", hdulist->naxis);
numcards++;
for (k = 0; k < hdulist->naxis; k++)
{
gchar naxisn[16];
g_snprintf (naxisn, sizeof (naxisn), "NAXIS%d", k+1);
FITS_WRITE_LONGCARD (ff->fp, naxisn, hdulist->naxisn[k]);
numcards++;
}
if (hdulist->used.extend)
{
FITS_WRITE_BOOLCARD (ff->fp, "EXTEND", hdulist->extend);
numcards++;
}
if (hdulist->used.groups)
{
FITS_WRITE_BOOLCARD (ff->fp, "GROUPS", hdulist->groups);
numcards++;
}
if (hdulist->used.pcount)
{
FITS_WRITE_LONGCARD (ff->fp, "PCOUNT", hdulist->pcount);
numcards++;
}
if (hdulist->used.gcount)
{
FITS_WRITE_LONGCARD (ff->fp, "GCOUNT", hdulist->gcount);
numcards++;
}
if (hdulist->used.bzero)
{
FITS_WRITE_DOUBLECARD (ff->fp, "BZERO", hdulist->bzero);
numcards++;
}
if (hdulist->used.bscale)
{
FITS_WRITE_DOUBLECARD (ff->fp, "BSCALE", hdulist->bscale);
numcards++;
}
if (hdulist->used.datamin)
{
FITS_WRITE_DOUBLECARD (ff->fp, "DATAMIN", hdulist->datamin);
numcards++;
}
if (hdulist->used.datamax)
{
FITS_WRITE_DOUBLECARD (ff->fp, "DATAMAX", hdulist->datamax);
numcards++;
}
if (hdulist->used.blank)
{
FITS_WRITE_LONGCARD (ff->fp, "BLANK", hdulist->blank);
numcards++;
}
/* Write additional cards */
if (hdulist->naddcards > 0)
{
fwrite (hdulist->addcards, FITS_CARD_SIZE, hdulist->naddcards, ff->fp);
numcards += hdulist->naddcards;
}
FITS_WRITE_CARD (ff->fp, "END");
numcards++;
k = (numcards * FITS_CARD_SIZE) % FITS_RECORD_SIZE;
if (k) /* Must the record be filled up ? */
{
while (k++ < FITS_RECORD_SIZE)
putc (' ', ff->fp);
}
return ferror (ff->fp) ? -1 : 0;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_decode_header - (local) decode a header */
/* */
/* Parameters: */
/* FitsRecordList *hdr [I] : the header record list */
/* long hdr_offset [I] : fileposition of header */
/* long dat_offset [I] : fileposition of data (end of header) */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function decodes the mostly used data within the header and generates */
/* a FitsHduList-entry. On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static FitsHduList *
fits_decode_header (FitsRecordList *hdr,
glong hdr_offset,
glong dat_offset)
{
FitsHduList *hdulist;
FitsData *fdat;
gchar errmsg[80], key[9];
gint k, bpp, random_groups;
glong mul_axis, data_size, bitpix_supported;
#define FITS_DECODE_CARD(mhdr,mkey,mfdat,mtyp) \
{ strcpy (key, mkey); \
mfdat = fits_decode_card (fits_search_card (mhdr, mkey), mtyp); \
if (mfdat == NULL) goto err_missing; }
#define FITS_TRY_CARD(mhdr,mhdu,mkey,mvar,mtyp,unionvar) \
{ FitsData *mfdat = fits_decode_card (fits_search_card (mhdr,mkey), mtyp); \
mhdu->used.mvar = (mfdat != NULL); \
if (mhdu->used.mvar) mhdu->mvar = mfdat->unionvar; }
hdulist = fits_new_hdulist ();
if (hdulist == NULL)
FITS_RETURN ("fits_decode_header: Not enough memory", NULL);
/* Initialize the header data */
hdulist->header_offset = hdr_offset;
hdulist->data_offset = dat_offset;
hdulist->used.simple = (strncmp (hdr->data, "SIMPLE ", 8) == 0);
hdulist->used.xtension = (strncmp (hdr->data, "XTENSION", 8) == 0);
if (hdulist->used.xtension)
{
fdat = fits_decode_card (fits_search_card (hdr, "XTENSION"),
FITS_DATA_TYPE_FSTRING);
if (fdat != NULL)
{
strcpy (hdulist->xtension, fdat->fstring);
}
else
{
strcpy (errmsg, "No valid XTENSION header found.");
goto err_return;
}
}
FITS_DECODE_CARD (hdr, "NAXIS", fdat, FITS_DATA_TYPE_FLONG);
hdulist->naxis = fdat->flong;
FITS_DECODE_CARD (hdr, "BITPIX", fdat, FITS_DATA_TYPE_FLONG);
bpp = hdulist->bitpix = (gint) fdat->flong;
if ((bpp != 8) && (bpp != 16) && (bpp != 32) &&
(bpp != -32) && (bpp != -64))
{
strcpy (errmsg, "fits_decode_header: Invalid BITPIX-value");
goto err_return;
}
if (bpp < 0)
bpp = -bpp;
bpp /= 8;
hdulist->bpp = bpp;
FITS_TRY_CARD (hdr, hdulist, "GCOUNT", gcount, FITS_DATA_TYPE_FLONG, flong);
FITS_TRY_CARD (hdr, hdulist, "PCOUNT", pcount, FITS_DATA_TYPE_FLONG, flong);
FITS_TRY_CARD (hdr, hdulist, "GROUPS", groups, FITS_DATA_TYPE_FLONG, fbool);
random_groups = hdulist->used.groups && hdulist->groups;
FITS_TRY_CARD (hdr, hdulist, "EXTEND", extend, FITS_DATA_TYPE_FBOOL, fbool);
if (hdulist->used.xtension) /* Extension requires GCOUNT and PCOUNT */
{
if (! hdulist->used.gcount || ! hdulist->used.pcount)
{
strcpy (errmsg, "fits_decode_header: Missing GCOUNT/PCOUNT for XTENSION");
goto err_return;
}
}
mul_axis = 1;
/* Find all NAXISx-cards */
for (k = 1; k <= FITS_MAX_AXIS; k++)
{
gchar naxisn[16];
g_snprintf (naxisn, sizeof (naxisn), "NAXIS%-3d", k);
fdat = fits_decode_card (fits_search_card (hdr, naxisn),
FITS_DATA_TYPE_FLONG);
if (fdat == NULL)
{
k--; /* Save the last NAXISk read */
break;
}
hdulist->naxisn[k-1] = (int)fdat->flong;
if (hdulist->naxisn[k-1] < 0)
{
strcpy (errmsg, "fits_decode_header: Negative value in NAXISn");
goto err_return;
}
if ((k == 1) && random_groups)
{
if (hdulist->naxisn[0] != 0)
{
strcpy (errmsg, "fits_decode_header: Random groups with NAXIS1 != 0");
goto err_return;
}
}
else
{
mul_axis *= hdulist->naxisn[k - 1];
}
}
if ((hdulist->naxis > 0) && (k < hdulist->naxis))
{
strcpy (errmsg, "fits_decode_card: Not enough NAXISn-cards");
goto err_return;
}
/* If we have only one dimension, just set the second to size one. */
/* So we don't have to check for naxis < 2 in some places. */
if (hdulist->naxis < 2)
hdulist->naxisn[1] = 1;
if (hdulist->naxis < 1)
{
mul_axis = 0;
hdulist->naxisn[0] = 1;
}
if (hdulist->used.xtension)
data_size = bpp * hdulist->gcount * (hdulist->pcount + mul_axis);
else
data_size = bpp * mul_axis;
hdulist->udata_size = data_size; /* Used data size without padding */
/* Datasize must be a multiple of the FITS logical record size */
data_size = (data_size + FITS_RECORD_SIZE - 1) / FITS_RECORD_SIZE;
data_size *= FITS_RECORD_SIZE;
hdulist->data_size = data_size;
FITS_TRY_CARD (hdr, hdulist, "BLANK", blank, FITS_DATA_TYPE_FLONG, flong);
FITS_TRY_CARD (hdr, hdulist, "DATAMIN", datamin, FITS_DATA_TYPE_FDOUBLE, fdouble);
FITS_TRY_CARD (hdr, hdulist, "DATAMAX", datamax, FITS_DATA_TYPE_FDOUBLE, fdouble);
FITS_TRY_CARD (hdr, hdulist, "BZERO", bzero, FITS_DATA_TYPE_FDOUBLE, fdouble);
FITS_TRY_CARD (hdr, hdulist, "BSCALE", bscale, FITS_DATA_TYPE_FDOUBLE, fdouble);
/* Evaluate number of interpretable images for this HDU */
hdulist->numpic = 0;
/* We must support this format */
bitpix_supported = (hdulist->bitpix > 0)
|| ( (hdulist->bitpix == -64)
&& (fits_ieee64_intel || fits_ieee64_motorola))
|| ( (hdulist->bitpix == -32)
&& ( fits_ieee32_intel || fits_ieee32_motorola
|| fits_ieee64_intel || fits_ieee64_motorola));
if (bitpix_supported)
{
if (hdulist->used.simple)
{
if (hdulist->naxis > 0)
{
hdulist->numpic = 1;
for (k = 3; k <= hdulist->naxis; k++)
hdulist->numpic *= hdulist->naxisn[k - 1];
}
}
else if (hdulist->used.xtension &&
(strncmp (hdulist->xtension, "IMAGE", 5) == 0))
{
if (hdulist->naxis > 0)
{
hdulist->numpic = 1;
for (k = 3; k <= hdulist->naxis; k++)
hdulist->numpic *= hdulist->naxisn[k - 1];
}
}
}
else
{
gchar msg[160];
g_snprintf (msg, sizeof (msg),
"fits_decode_header: IEEE floating point format required for "
"BITPIX=%d\nis not supported on this machine",
hdulist->bitpix);
fits_set_error (msg);
}
hdulist->header_record_list = hdr; /* Add header records to the list */
return hdulist;
err_missing:
g_snprintf (errmsg, sizeof (errmsg),
"fits_decode_header: missing/invalid %s card", key);
err_return:
fits_delete_hdulist (hdulist);
fits_set_error (errmsg);
return NULL;
#undef FITS_DECODE_CARD
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_eval_pixrange - (local) evaluate range of pixel data */
/* */
/* Parameters: */
/* FILE *fp [I] : file pointer */
/* FitsHduList *hdu [I] : pointer to header */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The Function sets the values hdu->pixmin and hdu->pixmax. On success 0 */
/* is returned. On failure, -1 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static gint
fits_eval_pixrange (FILE *fp,
FitsHduList *hdu)
{
register gint maxelem;
#define FITSNPIX 4096
guchar pixdat[FITSNPIX];
gint nelem, bpp;
gboolean blank_found = FALSE;
gboolean nan_found = FALSE;
if (fseek (fp, hdu->data_offset, SEEK_SET) < 0)
FITS_RETURN ("fits_eval_pixrange: can't position file", -1);
bpp = hdu->bpp; /* Number of bytes per pixel */
nelem = hdu->udata_size / bpp; /* Number of data elements */
switch (hdu->bitpix)
{
case 8:
{
register FitsBitpix8 pixval;
register guchar *ptr;
FitsBitpix8 minval = 255;
FitsBitpix8 maxval = 0;
while (nelem > 0)
{
maxelem = sizeof (pixdat) / bpp;
if (nelem < maxelem)
maxelem = nelem;
nelem -= maxelem;
if (fread ((gchar *) pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 8 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{
FitsBitpix8 blankval = (FitsBitpix8) hdu->blank;
while (maxelem-- > 0)
{
pixval = (FitsBitpix8)*(ptr++);
if (pixval != blankval)
{
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
else
{
blank_found = TRUE;
}
}
}
else
{
while (maxelem-- > 0)
{
pixval = (FitsBitpix8)*(ptr++);
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break;
}
case 16:
{
register FitsBitpix16 pixval;
register guchar *ptr;
FitsBitpix16 minval = 0x7fff;
FitsBitpix16 maxval = ~0x7fff;
while (nelem > 0)
{
maxelem = sizeof (pixdat) / bpp;
if (nelem < maxelem)
maxelem = nelem;
nelem -= maxelem;
if (fread ((gchar *) pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 16 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{
FitsBitpix16 blankval = (FitsBitpix16) hdu->blank;
while (maxelem-- > 0)
{
FITS_GETBITPIX16 (ptr, pixval);
ptr += 2;
if (pixval != blankval)
{
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
else
{
blank_found = TRUE;
}
}
}
else
{
while (maxelem-- > 0)
{
FITS_GETBITPIX16 (ptr, pixval);
ptr += 2;
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break;
}
case 32:
{
register FitsBitpix32 pixval;
register guchar *ptr;
FitsBitpix32 minval = 0x7fffffff;
FitsBitpix32 maxval = ~0x7fffffff;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem)
maxelem = nelem;
nelem -= maxelem;
if (fread ((gchar *) pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 32 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{
FitsBitpix32 blankval = (FitsBitpix32)hdu->blank;
while (maxelem-- > 0)
{
FITS_GETBITPIX32 (ptr, pixval);
ptr += 4;
if (pixval != blankval)
{
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
else
{
blank_found = TRUE;
}
}
}
else
{
while (maxelem-- > 0)
{
FITS_GETBITPIX32 (ptr, pixval);
ptr += 4;
if (pixval < minval)
minval = pixval;
else if (pixval > maxval)
maxval = pixval;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break;
}
case -32:
{
register FitsBitpixM32 pixval = 0;
register guchar *ptr;
FitsBitpixM32 minval = 0;
FitsBitpixM32 maxval = 0;
gboolean first = TRUE;
while (nelem > 0)
{
maxelem = sizeof (pixdat) / bpp;
if (nelem < maxelem)
maxelem = nelem;
nelem -= maxelem;
if (fread ((gchar *) pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix -32 data", -1);
ptr = pixdat;
while (maxelem-- > 0)
{
if (! fits_nan_32 (ptr))
{
FITS_GETBITPIXM32 (ptr, pixval);
ptr += 4;
if (first)
{
first = FALSE;
minval = maxval = pixval;
}
else if (pixval < minval)
{
minval = pixval;
}
else if (pixval > maxval)
{
maxval = pixval;
}
}
else
{
nan_found = TRUE;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break;
}
case -64:
{
register FitsBitpixM64 pixval;
register guchar *ptr;
FitsBitpixM64 minval = 0;
FitsBitpixM64 maxval = 0;
gboolean first = TRUE;
while (nelem > 0)
{
maxelem = sizeof (pixdat) / bpp;
if (nelem < maxelem)
maxelem = nelem;
nelem -= maxelem;
if (fread ((gchar *) pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix -64 data", -1);
ptr = pixdat;
while (maxelem-- > 0)
{
if (! fits_nan_64 (ptr))
{
FITS_GETBITPIXM64 (ptr, pixval);
ptr += 8;
if (first)
{
first = FALSE;
minval = maxval = pixval;
}
else if (pixval < minval)
{
minval = pixval;
}
else if (pixval > maxval)
{
maxval = pixval;
}
}
else
{
nan_found = TRUE;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break;
}
}
if (nan_found)
hdu->used.nan_value = TRUE;
if (blank_found)
hdu->used.blank_value = TRUE;
return 0;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_decode_card - decode a card */
/* */
/* Parameters: */
/* const char *card [I] : pointer to card image */
/* FitsDataType data_type [I] : datatype to decode */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* Decodes a card and returns a pointer to the union, keeping the data. */
/* If card is NULL or on failure, a NULL-pointer is returned. */
/* If the card does not have the value indicator, an error is generated, */
/* but its tried to decode the card. The data is only valid up to the next */
/* call of the function. */
/* */
/* #END-PAR */
/*****************************************************************************/
FitsData *
fits_decode_card (const gchar *card,
FitsDataType data_type)
{
static FitsData data;
glong l_long;
gdouble l_double;
gchar l_card[FITS_CARD_SIZE + 1];
gchar msg[256];
gchar *cp, *dst, *end;
gint ErrCount = 0;
if (card == NULL)
return NULL;
memcpy (l_card, card, FITS_CARD_SIZE);
l_card[FITS_CARD_SIZE] = '\0';
if (strncmp (card+8, "= ", 2) != 0)
{
g_snprintf (msg, sizeof (msg),
"fits_decode_card (warning): Missing value indicator "
"'= ' for %8.8s", l_card);
fits_set_error (msg);
ErrCount++;
}
switch (data_type)
{
case FITS_DATA_TYPE_BITPIX_8:
data.bitpix8 = (FitsBitpix8) (l_card[10]);
break;
case FITS_DATA_TYPE_BITPIX_16:
if (sscanf (l_card + 10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_BITPIX_16");
ErrCount++;
break;
}
data.bitpix16 = (FitsBitpix16) l_long;
break;
case FITS_DATA_TYPE_BITPIX_32:
if (sscanf (l_card + 10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_BITPIX_32");
ErrCount++;
break;
}
data.bitpix32 = (FitsBitpix32) l_long;
break;
case FITS_DATA_TYPE_BITPIX_M32:
if (fits_scanfdouble (l_card + 10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_BITPIX_M32");
ErrCount++;
break;
}
data.bitpixm32 = (FitsBitpixM32) l_double;
break;
case FITS_DATA_TYPE_BITPIX_M64:
if (fits_scanfdouble (l_card + 10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_BITPIX_M64");
ErrCount++;
break;
}
data.bitpixm64 = (FitsBitpixM64) l_double;
break;
case FITS_DATA_TYPE_FBOOL:
cp = l_card + 10;
while (*cp == ' ')
cp++;
if (*cp == 'T')
{
data.fbool = 1;
}
else if (*cp == 'F')
{
data.fbool = 0;
}
else
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_FBOOL");
ErrCount++;
break;
}
break;
case FITS_DATA_TYPE_FLONG:
if (sscanf (l_card + 10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_FLONG");
ErrCount++;
break;
}
data.flong = (FitsBitpix32) l_long;
break;
case FITS_DATA_TYPE_FDOUBLE:
if (fits_scanfdouble (l_card + 10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding FITS_DATA_TYPE_FDOUBLE");
ErrCount++;
break;
}
data.fdouble = (FitsBitpixM32) l_double;
break;
case FITS_DATA_TYPE_FSTRING:
cp = l_card + 10;
if (*cp != '\'')
{
fits_set_error ("fits_decode_card: missing \' decoding FITS_DATA_TYPE_FSTRING");
ErrCount++;
break;
}
dst = data.fstring;
cp++;
end = l_card + FITS_CARD_SIZE - 1;
for (;;) /* Search for trailing quote */
{
if (*cp != '\'') /* All characters but quote are used. */
{
*(dst++) = *cp;
}
else /* Maybe there is a quote in the string */
{
if (cp >= end)
break; /* End of card ? finished */
if (*(cp+1) != '\'')
break;
*(dst++) = *(cp++);
}
if (cp >= end)
break;
cp++;
}
*dst = '\0';
break;
}
return (ErrCount == 0) ? &data : NULL;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_search_card - search a card in the record list */
/* */
/* Parameters: */
/* FitsRecordList *rl [I] : record list to search */
/* char *keyword [I] : keyword identifying the card */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* A card is searched in the record list. Only the first eight characters of */
/* keyword are significant. If keyword is less than 8 characters, its filled */
/* with blanks. */
/* If the card is found, a pointer to the card is returned. */
/* The pointer does not point to a null-terminated string. Only the next */
/* 80 bytes are allowed to be read. */
/* On failure a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
gchar *
fits_search_card (FitsRecordList *rl,
gchar *keyword)
{
gint key_len, k;
gchar key[9];
key_len = strlen (keyword);
if (key_len > 8)
key_len = 8;
if (key_len == 0)
FITS_RETURN ("fits_search_card: Invalid parameter", NULL);
strcpy (key, " ");
memcpy (key, keyword, key_len);
while (rl != NULL)
{
gchar *card = (gchar *) rl->data;
for (k = 0; k < FITS_RECORD_SIZE / FITS_CARD_SIZE; k++)
{
if (strncmp (card, key, 8) == 0)
return (card);
card += FITS_CARD_SIZE;
}
rl = rl->next_record;
}
return NULL;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_image_info - get information about an image */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS file structure */
/* int picind [I] : Index of picture in file (1,2,...) */
/* int *hdupicind [O] : Index of picture in HDU (1,2,...) */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function returns on success a pointer to a FitsHduList. hdupicind */
/* then gives the index of the image within the HDU. */
/* On failure, NULL is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
FitsHduList *
fits_image_info (FitsFile *ff,
gint picind,
gint *hdupicind)
{
FitsHduList *hdulist;
gint firstpic, lastpic;
if (ff == NULL)
FITS_RETURN ("fits_image_info: ff is NULL", NULL);
if (ff->openmode != 'r')
FITS_RETURN ("fits_image_info: file not open for reading", NULL);
if ((picind < 1) || (picind > ff->n_pic))
FITS_RETURN ("fits_image_info: picind out of range", NULL);
firstpic = 1;
for (hdulist = ff->hdu_list; hdulist != NULL; hdulist = hdulist->next_hdu)
{
if (hdulist->numpic <= 0)
continue;
lastpic = firstpic + hdulist->numpic - 1;
if (picind <= lastpic) /* Found image in current HDU ? */
break;
firstpic = lastpic + 1;
}
*hdupicind = picind - firstpic + 1;
return hdulist;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_seek_image - position to a specific image */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS file structure */
/* int picind [I] : Index of picture to seek (1,2,...) */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function positions the file pointer to a specified image. */
/* The function returns on success a pointer to a FitsHduList. This pointer */
/* must also be used when reading data from the image. */
/* On failure, NULL is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
FitsHduList *
fits_seek_image (FitsFile *ff,
gint picind)
{
FitsHduList *hdulist;
gint hdupicind;
glong offset, pic_size;
hdulist = fits_image_info (ff, picind, &hdupicind);
if (hdulist == NULL)
return NULL;
pic_size = hdulist->bpp * hdulist->naxisn[0] * hdulist->naxisn[1];
offset = hdulist->data_offset + (hdupicind - 1) * pic_size;
if (fseek (ff->fp, offset, SEEK_SET) < 0)
FITS_RETURN ("fits_seek_image: Unable to position to image", NULL);
return hdulist;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_read_pixel - read pixel values from a file */
/* */
/* Parameters: */
/* FitsFile *ff [I] : FITS file structure */
/* FitsHduList *hdulist [I] : pointer to hdulist that describes image */
/* int npix [I] : number of pixel values to read */
/* FitsPixTransform *trans [I]: pixel transformation */
/* void *buf [O] : buffer where to place transformed pixels */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function reads npix pixel values from the file, transforms them */
/* checking for blank/NaN pixels and stores the transformed values in buf. */
/* The number of transformed pixels is returned. If the returned value is */
/* less than npix (or even -1), an error has occurred. */
/* hdulist must be a pointer returned by fits_seek_image(). Before starting */
/* to read an image, fits_seek_image() must be called. Even for successive */
/* images. */
/* */
/* #END-PAR */
/*****************************************************************************/
gint
fits_read_pixel (FitsFile *ff,
FitsHduList *hdulist,
gint npix,
FitsPixTransform *trans,
void *buf)
{
gdouble offs, scale;
gdouble datadiff, pixdiff;
guchar pixbuffer[4096];
guchar *pix;
glong creplace;
gint transcount = 0;
glong tdata, tmin, tmax;
gint maxelem;
if (ff->openmode != 'r')
return -1; /* Not open for reading */
if (trans->dsttyp != 'k')
return -1; /* Currently we only return types equivalent to the image format */
if (npix <= 0)
return npix;
datadiff = trans->datamax - trans->datamin;
pixdiff = trans->pixmax - trans->pixmin;
offs = trans->datamin - trans->pixmin * datadiff / pixdiff;
scale = datadiff / pixdiff;
tmin = (glong) trans->datamin;
tmax = (glong) trans->datamax;
creplace = (glong) trans->replacement;
switch (hdulist->bitpix)
{
case 8:
{
guchar *cdata = (guchar *) buf;
while (npix > 0) /* For all pixels to read */
{
FitsBitpix8 bp8, bp8blank;
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix)
maxelem = npix;
if (fread ((gchar *) pixbuffer, hdulist->bpp,
maxelem, ff->fp) != maxelem)
return -1;
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp8blank = (FitsBitpix8) hdulist->blank;
while (maxelem--)
{
bp8 = (FitsBitpix8) * (pix++);
if (bp8 == bp8blank) /* Is it a blank pixel ? */
{
*(cdata++) = (guchar) creplace;
}
else /* Do transform */
{
tdata = (glong) (bp8 * scale + offs);
tdata = CLAMP (tdata, tmin, tmax);
*(cdata++) = (guchar) tdata;
}
transcount++;
}
}
else
{
while (maxelem--)
{
bp8 = (FitsBitpix8) * (pix++);
tdata = (glong) (bp8 * scale + offs);
tdata = CLAMP (tdata, tmin, tmax);
*(cdata++) = (guchar) tdata;
transcount++;
}
}
}
}
break;
case 16:
{
FitsBitpix16 *cdata = (FitsBitpix16 *) buf;
while (npix > 0) /* For all pixels to read */
{
FitsBitpix16 bp16, bp16blank;
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix)
maxelem = npix;
if (fread ((gchar *) pixbuffer, hdulist->bpp,
maxelem, ff->fp) != maxelem)
return -1;
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp16blank = (FitsBitpix16) hdulist->blank;
while (maxelem--)
{
FITS_GETBITPIX16 (pix, bp16);
if (bp16 == bp16blank)
{
*(cdata++) = (FitsBitpix16) creplace;
}
else
{
tdata = (glong) (bp16 * scale + offs);
if (tdata < tmin)
tdata = tmin;
else if (tdata > tmax)
tdata = tmax;
*(cdata++) = (FitsBitpix16) tdata;
}
transcount++;
pix += 2;
}
}
else
{
while (maxelem--)
{
FITS_GETBITPIX16 (pix, bp16);
tdata = (glong) (bp16 * scale + offs);
if (tdata < tmin)
tdata = tmin;
else if (tdata > tmax)
tdata = tmax;
*(cdata++) = (FitsBitpix16) tdata;
transcount++;
pix += 2;
}
}
}
}
break;
case 32:
{
FitsBitpix32 *cdata = (FitsBitpix32 *) buf;
while (npix > 0) /* For all pixels to read */
{
FitsBitpix32 bp32, bp32blank;
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix)
maxelem = npix;
if (fread ((gchar *) pixbuffer, hdulist->bpp,
maxelem, ff->fp) != maxelem)
return -1;
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp32blank = (FitsBitpix32) hdulist->blank;
while (maxelem--)
{
FITS_GETBITPIX32 (pix, bp32);
if (bp32 == bp32blank)
{
*(cdata++) = (FitsBitpix32) creplace;
}
else
{
tdata = (glong) (bp32 * scale + offs);
if (tdata < tmin)
tdata = tmin;
else if (tdata > tmax)
tdata = tmax;
*(cdata++) = (FitsBitpix32) tdata;
}
transcount++;
pix += 4;
}
}
else
{
while (maxelem--)
{
FITS_GETBITPIX32 (pix, bp32);
tdata = (glong) (bp32 * scale + offs);
tdata = CLAMP (tdata, tmin, tmax);
*(cdata++) = (FitsBitpix32) tdata;
transcount++;
pix += 4;
}
}
}
}
break;
case -32:
{
FitsBitpixM32 *cdata = (FitsBitpixM32 *) buf;
while (npix > 0) /* For all pixels to read */
{
FitsBitpixM32 bpm32 = 0;
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix)
maxelem = npix;
if (fread ((gchar *) pixbuffer, hdulist->bpp,
maxelem, ff->fp) != maxelem)
return -1;
npix -= maxelem;
pix = pixbuffer;
while (maxelem--)
{
if (fits_nan_32 (pix)) /* An IEEE special value ? */
{
*(cdata++) = trans->replacement;
}
else /* Do transform */
{
FITS_GETBITPIXM32 (pix, bpm32);
bpm32 = bpm32 * scale + offs;
bpm32 = CLAMP (bpm32, trans->datamin, trans->datamax);
*(cdata++) = bpm32;
}
transcount++;
pix += 4;
}
}
}
break;
case -64:
{
FitsBitpixM64 *cdata = (FitsBitpixM64 *) buf;
while (npix > 0) /* For all pixels to read */
{
FitsBitpixM64 bpm64;
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix)
maxelem = npix;
if (fread ((gchar *) pixbuffer, hdulist->bpp,
maxelem, ff->fp) != maxelem)
return -1;
npix -= maxelem;
pix = pixbuffer;
while (maxelem--)
{
if (fits_nan_64 (pix))
{
*(cdata++) = trans->replacement;
}
else
{
FITS_GETBITPIXM64 (pix, bpm64);
bpm64 = bpm64 * scale + offs;
bpm64 = CLAMP (bpm64, trans->datamin, trans->datamax);
*(cdata++) = bpm64;
}
transcount++;
pix += 8;
}
}
}
break;
}
return transcount;
}
#ifndef FITS_NO_DEMO
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_to_pgmraw - convert FITS-file to raw PGM-file */
/* */
/* Parameters: */
/* char *fitsfile [I] : name of fitsfile */
/* char *pgmfile [I] : name of pgmfile */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function converts a FITS-file to a raw PGM-file. The PGM-file will */
/* be upside down, because the orientation for storing the image is */
/* different. On success, 0 is returned. On failure, -1 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
gint
fits_to_pgmraw (gchar *fitsfile,
gchar *pgmfile)
{
FitsFile *fitsin = NULL;
FILE *pgmout = NULL;
FitsHduList *hdu;
FitsPixTransform trans;
gint retval = -1, nbytes, maxbytes;
gchar buffer[1024];
fitsin = fits_open (fitsfile, "r"); /* Open FITS-file for reading */
if (fitsin == NULL)
goto err_return;
if (fitsin->n_pic < 1)
goto err_return; /* Any picture in it ? */
hdu = fits_seek_image (fitsin, 1); /* Position to the first image */
if (hdu == NULL)
goto err_return;
if (hdu->naxis < 2)
goto err_return; /* Enough dimensions ? */
pgmout = g_fopen (pgmfile, "wb");
if (pgmout == NULL)
goto err_return;
/* Write PGM header with width/height */
fprintf (pgmout, "P5\n%d %d\n255\n", hdu->naxisn[0], hdu->naxisn[1]);
/* Set up transformation for FITS pixel values to 0...255 */
/* It maps trans.pixmin to trans.datamin and trans.pixmax to trans.datamax. */
/* Values out of range [datamin, datamax] are clamped */
trans.pixmin = hdu->pixmin;
trans.pixmax = hdu->pixmax;
trans.datamin = 0.0;
trans.datamax = 255.0;
trans.replacement = 0.0; /* Blank/NaN replacement value */
trans.dsttyp = 'c'; /* Output type is character */
nbytes = hdu->naxisn[0]*hdu->naxisn[1];
while (nbytes > 0)
{
maxbytes = sizeof (buffer);
if (maxbytes > nbytes)
maxbytes = nbytes;
/* Read pixels and transform them */
if (fits_read_pixel (fitsin, hdu, maxbytes, &trans, buffer) != maxbytes)
goto err_return;
if (fwrite (buffer, 1, maxbytes, pgmout) != maxbytes)
goto err_return;
nbytes -= maxbytes;
}
retval = 0;
err_return:
if (fitsin)
fits_close (fitsin);
if (pgmout)
fclose (pgmout);
return retval;
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : pgmraw to fits - convert raw PGM-file to FITS-file */
/* */
/* Parameters: */
/* char *pgmfile [I] : name of pgmfile */
/* char *fitsfile [I] : name of fitsfile */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* The function converts a raw PGM-file to a FITS-file. The FITS-file will */
/* be upside down, because the orientation for storing the image is */
/* different. On success, 0 is returned. On failure, -1 is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
gint
pgmraw_to_fits (gchar *pgmfile,
gchar *fitsfile)
{
FitsFile *fitsout = NULL;
FILE *pgmin = NULL;
FitsHduList *hdu;
gchar buffer[1024];
gint width, height, numbytes, maxbytes;
gint retval = -1;
fitsout = fits_open (fitsfile, "w");
if (fitsout == NULL)
goto err_return;
pgmin = g_fopen (pgmfile, "r");
if (pgmin == NULL)
goto err_return;
/* Read signature of PGM file */
if (fgets (buffer, sizeof (buffer), pgmin) == NULL)
goto err_return;
if ((buffer[0] != 'P') || (buffer[1] != '5'))
goto err_return;
/* Skip comments up to width/height */
do
{
if (fgets (buffer, sizeof (buffer), pgmin) == NULL)
goto err_return;
}
while (buffer[0] == '#');
if (sscanf (buffer, "%d%d", &width, &height) != 2)
goto err_return;
if ((width < 1) || (height < 1))
goto err_return;
/* Skip comments up to maxval */
do
{
if (fgets (buffer, sizeof (buffer), pgmin) == NULL)
goto err_return;
}
while (buffer[0] == '#');
/* Ignore maxval */
hdu = fits_add_hdu (fitsout); /* Create a HDU for the FITS file */
if (hdu == NULL)
goto err_return;
hdu->used.simple = 1; /* Set proper values */
hdu->bitpix = 8;
hdu->naxis = 2;
hdu->naxisn[0] = width;
hdu->naxisn[1] = height;
hdu->used.datamin = 1;
hdu->datamin = 0.0;
hdu->used.datamax = 1;
hdu->datamax = 255.0;
hdu->used.bzero = 1;
hdu->bzero = 0.0;
hdu->used.bscale = 1;
hdu->bscale = 1.0;
fits_add_card (hdu, "");
fits_add_card (hdu,
"HISTORY THIS FITS FILE WAS GENERATED BY FITSRW "
"USING PGMRAW_TO_FITS");
/* Write the header. Blocking is done automatically */
if (fits_write_header (fitsout, hdu) < 0)
goto err_return;
/* The primary array plus blocking must be written manually */
numbytes = width * height;
while (numbytes > 0)
{
maxbytes = sizeof (buffer);
if (maxbytes > numbytes)
maxbytes = numbytes;
if (fread (buffer, 1, maxbytes, pgmin) != maxbytes)
goto err_return;
if (fwrite (buffer, 1, maxbytes, fitsout->fp) != maxbytes)
goto err_return;
numbytes -= maxbytes;
}
/* Do blocking */
numbytes = (width * height) % FITS_RECORD_SIZE;
if (numbytes)
{
while (numbytes++ < FITS_RECORD_SIZE)
if (putc (0, fitsout->fp) == EOF)
goto err_return;
}
retval = 0;
err_return:
if (fitsout)
fits_close (fitsout);
if (pgmin)
fclose (pgmin);
return retval;
}
#endif /* ! FITS_NO_DEMO */