/******************************************************************************/
/* 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 independant to that (beside use */
/* of glib). If someone finds it useful for other purposes, try to keep it */
/* independant 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 funtions */
static FITS_FILE *fits_new_filestruct (void);
static FITS_HDU_LIST *fits_new_hdulist (void);
static void fits_delete_filestruct (FITS_FILE *ff);
static void fits_delete_recordlist (FITS_RECORD_LIST *rl);
static void fits_delete_hdulist (FITS_HDU_LIST *hl);
static int fits_nan_32 (unsigned char *value);
static int fits_nan_64 (unsigned char *value);
static void fits_set_error (const char *errmsg);
static void fits_drop_error (void);
static FITS_RECORD_LIST *fits_read_header (FILE *fp, int *nrec);
static FITS_HDU_LIST *fits_decode_header (FITS_RECORD_LIST *hdr,
long hdr_offset, long dat_offset);
static int fits_eval_pixrange (FILE *fp, FITS_HDU_LIST *hdu);
/* Error handling like a FIFO */
#define FITS_MAX_ERROR 16
#define FITS_ERROR_LENGTH 256
static int fits_n_error = 0;
static char fits_error[FITS_MAX_ERROR][FITS_ERROR_LENGTH];
/* What byte ordering for IEEE-format we are running on ? */
static int fits_ieee32_intel = 0;
static int fits_ieee32_motorola = 0;
static int fits_ieee64_intel = 0;
static int 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 (unsigned char *) */
#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 (unsigned char *). */
/* The floating point values must directly correspond */
/* to machine representation. Otherwise it does not work. */
#define FITS_GETBITPIXM32(p,val) \
{ if (fits_ieee32_intel) {unsigned char uc[4]; \
uc[0] = p[3]; uc[1] = p[2]; uc[2] = p[1]; uc[3] = p[0]; \
val = *(FITS_BITPIXM32 *)uc; } \
else if (fits_ieee32_motorola) { val = *(FITS_BITPIXM32 *)p; } \
else if (fits_ieee64_motorola) {FITS_BITPIXM64 m64; \
unsigned char *uc= (unsigned char *)&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 = (FITS_BITPIXM32)m64; } \
else if (fits_ieee64_intel) {FITS_BITPIXM64 i64; \
unsigned char *uc= (unsigned char *)&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 = (FITS_BITPIXM32)i64;}\
}
#define FITS_GETBITPIXM64(p,val) \
{ if (fits_ieee64_intel) {unsigned char 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 = *(FITS_BITPIXM64 *)uc; } else val = *(FITS_BITPIXM64 *)p; }
#define FITS_WRITE_BOOLCARD(fp,key,value) \
{char card[81]; \
sprintf (card, "%-8.8s= %20s%50s", key, value ? "T" : "F", " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_LONGCARD(fp,key,value) \
{char card[81]; \
sprintf (card, "%-8.8s= %20ld%50s", key, (long)value, " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_DOUBLECARD(fp,key,value) \
{char card[81], dbl[21], *istr; \
g_ascii_formatd (dbl, sizeof(dbl), "%f", (gdouble)value); \
istr = strstr (dbl, "e"); \
if (istr) *istr = 'E'; \
sprintf (card, "%-8.8s= %20.20s%50s", key, dbl, " "); \
fwrite (card, 1, 80, fp); }
#define FITS_WRITE_STRINGCARD(fp,key,value) \
{char card[81]; int k;\
sprintf (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) \
{char card[81]; \
sprintf (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 int fits_scanfdouble (const char *buf, double *value)
{
int retval = 0;
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 = 1;
}
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 = 1;
}
}
}
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 FITS_FILE *fits_new_filestruct (void)
{FITS_FILE *ff;
ff = (FITS_FILE *)malloc (sizeof (FITS_FILE));
if (ff == NULL) return (NULL);
memset ((char *)ff, 0, sizeof (*ff));
return (ff);
}
/*****************************************************************************/
/* #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 FITS_HDU_LIST *fits_new_hdulist (void)
{FITS_HDU_LIST *hdl;
hdl = (FITS_HDU_LIST *)malloc (sizeof (FITS_HDU_LIST));
if (hdl == NULL) return (NULL);
memset ((char *)hdl, 0, sizeof (*hdl));
hdl->pixmin = hdl->pixmax = hdl->datamin = hdl->datamax = 0.0;
hdl->bzero = hdl->bscale = 0.0;
return (hdl);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_filestruct - (local) delete file structure */
/* */
/* Parameters: */
/* FITS_FILE *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 (FITS_FILE *ff)
{
if (ff == NULL) return;
fits_delete_hdulist (ff->hdu_list);
ff->hdu_list = NULL;
ff->fp = NULL;
free ((char *)ff);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_recordlist - (local) delete record list */
/* */
/* Parameters: */
/* FITS_RECORD_LIST *rl [I] : record list to delete */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
static void fits_delete_recordlist (FITS_RECORD_LIST *rl)
{FITS_RECORD_LIST *next;
while (rl != NULL)
{
next = rl->next_record;
rl->next_record = NULL;
free ((char *)rl);
rl = next;
}
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_delete_hdulist - (local) delete hdu list */
/* */
/* Parameters: */
/* FITS_HDU_LIST *hl [I] : hdu list to delete */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
static void fits_delete_hdulist (FITS_HDU_LIST *hl)
{FITS_HDU_LIST *next;
while (hl != NULL)
{
fits_delete_recordlist (hl->header_record_list);
next = hl->next_hdu;
hl->next_hdu = NULL;
free ((char *)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 (unsigned char *v)
{register unsigned long k;
k = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | v[3];
k &= 0x7fffffff; /* Dont 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 (unsigned char *v)
{register unsigned long k;
k = (v[0] << 24) | (v[1] << 16) | (v[2] << 8) | v[3];
k &= 0x7fffffff; /* Dont 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 */
/*****************************************************************************/
char *fits_get_error (void)
{static char errmsg[FITS_ERROR_LENGTH];
int 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 char *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 FITS_FILE-pointer is returned. On failure, a NULL- */
/* pointer is returned. */
/* The functions scans through the file loading each header and analyzing */
/* them. */
/* */
/* #END-PAR */
/*****************************************************************************/
FITS_FILE *fits_open (const char *filename, const char *openmode)
{int reading, writing, n_rec, n_hdr;
long fpos_header, fpos_data;
FILE *fp;
FITS_FILE *ff;
FITS_RECORD_LIST *hdrlist;
FITS_HDU_LIST *hdulist, *last_hdulist;
/* initialize */
hdulist = NULL;
last_hdulist = NULL;
/* Check the IEEE-format we are running on */
{float one32 = 1.0;
double one64 = 1.0;
unsigned char *op32 = (unsigned char *)&one32;
unsigned char *op64 = (unsigned char *)&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 = 1;
if (hdulist->used.nan_value) ff->nan_used = 1;
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: */
/* FITS_FILE *ff [I] : FITS file pointer */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
void fits_close (FITS_FILE *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: */
/* FITS_FILE *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 */
/*****************************************************************************/
FITS_HDU_LIST *fits_add_hdu (FITS_FILE *ff)
{FITS_HDU_LIST *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: */
/* FITS_HDU_LIST *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 */
/*****************************************************************************/
int fits_add_card (FITS_HDU_LIST *hdulist, const char *card)
{int 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: */
/* FITS_HDU_LIST *hdr [I] : pointer to the header */
/* ( mode : I=input, O=output, I/O=input/output ) */
/* */
/* #END-PAR */
/*****************************************************************************/
void fits_print_header (FITS_HDU_LIST *hdr)
{int k;
char 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 FITS_RECORD_LIST *fits_read_header (FILE *fp, int *nrec)
{char record[FITS_RECORD_SIZE];
FITS_RECORD_LIST *start_list = NULL, *cu_record = NULL, *new_record;
FITS_DATA *fdat;
int 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, typ_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 = (FITS_RECORD_LIST *)malloc (sizeof (FITS_RECORD_LIST));
if (new_record == NULL)
{
fits_delete_recordlist (start_list);
FITS_RETURN ("fits_read_header: Not enough memory", NULL);
}
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: */
/* FITS_FILE *ff [I] : FITS-file pointer */
/* FITS_HDU_LIST [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 */
/*****************************************************************************/
int fits_write_header (FITS_FILE *ff, FITS_HDU_LIST *hdulist)
{int numcards;
int 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++)
{char naxisn[10];
sprintf (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: */
/* FITS_RECORD_LIST *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 FITS_HDU_LIST-entry. On failure, a NULL-pointer is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
static FITS_HDU_LIST *fits_decode_header (FITS_RECORD_LIST *hdr,
long hdr_offset, long dat_offset)
{FITS_HDU_LIST *hdulist;
FITS_DATA *fdat;
char errmsg[80], key[9];
int k, bpp, random_groups;
long 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) \
{FITS_DATA *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"), typ_fstring);
strcpy (hdulist->xtension, fdat->fstring);
}
FITS_DECODE_CARD (hdr, "NAXIS", fdat, typ_flong);
hdulist->naxis = fdat->flong;
FITS_DECODE_CARD (hdr, "BITPIX", fdat, typ_flong);
bpp = hdulist->bitpix = (int)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, typ_flong, flong);
FITS_TRY_CARD (hdr, hdulist, "PCOUNT", pcount, typ_flong, flong);
FITS_TRY_CARD (hdr, hdulist, "GROUPS", groups, typ_fbool, fbool);
random_groups = hdulist->used.groups && hdulist->groups;
FITS_TRY_CARD (hdr, hdulist, "EXTEND", extend, typ_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++)
{char naxisn[9];
sprintf (naxisn, "NAXIS%-3d", k);
fdat = fits_decode_card (fits_search_card (hdr, naxisn), typ_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 dont 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, typ_flong, flong);
FITS_TRY_CARD (hdr, hdulist, "DATAMIN", datamin, typ_fdouble, fdouble);
FITS_TRY_CARD (hdr, hdulist, "DATAMAX", datamax, typ_fdouble, fdouble);
FITS_TRY_CARD (hdr, hdulist, "BZERO", bzero, typ_fdouble, fdouble);
FITS_TRY_CARD (hdr, hdulist, "BSCALE", bscale, typ_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
{char msg[160];
sprintf (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:
sprintf (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 */
/* FITS_HDU_LIST *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 int fits_eval_pixrange (FILE *fp, FITS_HDU_LIST *hdu)
{register int maxelem;
#define FITSNPIX 4096
unsigned char pixdat[FITSNPIX];
int nelem, bpp;
int blank_found = 0, nan_found = 0;
if (fseek (fp, hdu->data_offset, SEEK_SET) < 0)
FITS_RETURN ("fits_eval_pixrange: cant 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 FITS_BITPIX8 pixval;
register unsigned char *ptr;
FITS_BITPIX8 minval = 255, maxval = 0;
FITS_BITPIX8 blankval;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem) maxelem = nelem;
nelem -= maxelem;
if (fread ((char *)pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 8 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{
blankval = (FITS_BITPIX8)hdu->blank;
while (maxelem-- > 0)
{
pixval = (FITS_BITPIX8)*(ptr++);
if (pixval != blankval)
{
if (pixval < minval) minval = pixval;
else if (pixval > maxval) maxval = pixval;
}
else blank_found = 1;
}
}
else
{
while (maxelem-- > 0)
{
pixval = (FITS_BITPIX8)*(ptr++);
if (pixval < minval) minval = pixval;
else if (pixval > maxval) maxval = pixval;
}
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break; }
case 16: {
register FITS_BITPIX16 pixval;
register unsigned char *ptr;
FITS_BITPIX16 minval = 0x7fff, maxval = ~0x7fff;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem) maxelem = nelem;
nelem -= maxelem;
if (fread ((char *)pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 16 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{FITS_BITPIX16 blankval = (FITS_BITPIX16)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 = 1;
}
}
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 FITS_BITPIX32 pixval;
register unsigned char *ptr;
FITS_BITPIX32 minval = 0x7fffffff, maxval = ~0x7fffffff;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem) maxelem = nelem;
nelem -= maxelem;
if (fread ((char *)pixdat, bpp, maxelem, fp) != maxelem)
FITS_RETURN ("fits_eval_pixrange: error on read bitpix 32 data", -1);
ptr = pixdat;
if (hdu->used.blank)
{FITS_BITPIX32 blankval = (FITS_BITPIX32)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 = 1;
}
}
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 FITS_BITPIXM32 pixval;
register unsigned char *ptr;
FITS_BITPIXM32 minval, maxval;
int first = 1;
/* initialize */
pixval = 0;
minval = 0;
maxval = 0;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem) maxelem = nelem;
nelem -= maxelem;
if (fread ((char *)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 = 0;
minval = maxval = pixval;
}
else if (pixval < minval) { minval = pixval; }
else if (pixval > maxval) { maxval = pixval; }
}
else nan_found = 1;
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break; }
case -64: {
register FITS_BITPIXM64 pixval;
register unsigned char *ptr;
FITS_BITPIXM64 minval, maxval;
int first = 1;
/* initialize */
minval = 0;
maxval = 0;
while (nelem > 0)
{
maxelem = sizeof (pixdat)/bpp;
if (nelem < maxelem) maxelem = nelem;
nelem -= maxelem;
if (fread ((char *)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 = 0;
minval = maxval = pixval;
}
else if (pixval < minval) { minval = pixval; }
else if (pixval > maxval) { maxval = pixval; }
}
else nan_found = 1;
}
}
hdu->pixmin = minval;
hdu->pixmax = maxval;
break; }
}
if (nan_found) hdu->used.nan_value = 1;
if (blank_found) hdu->used.blank_value = 1;
return (0);
}
/*****************************************************************************/
/* #BEG-PAR */
/* */
/* Function : fits_decode_card - decode a card */
/* */
/* Parameters: */
/* const char *card [I] : pointer to card image */
/* FITS_DATA_TYPES 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 */
/*****************************************************************************/
FITS_DATA *fits_decode_card (const char *card, FITS_DATA_TYPES data_type)
{static FITS_DATA data;
long l_long;
double l_double;
char l_card[FITS_CARD_SIZE+1], msg[256];
char *cp, *dst, *end;
int 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)
{
sprintf (msg, "fits_decode_card (warning): Missing value indicator\
'= ' for %8.8s", l_card);
fits_set_error (msg);
ErrCount++;
}
switch (data_type)
{
case typ_bitpix8:
data.bitpix8 = (FITS_BITPIX8)(l_card[10]);
break;
case typ_bitpix16:
if (sscanf (l_card+10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_bitpix16");
ErrCount++;
break;
}
data.bitpix16 = (FITS_BITPIX16)l_long;
break;
case typ_bitpix32:
if (sscanf (l_card+10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_bitpix32");
ErrCount++;
break;
}
data.bitpix32 = (FITS_BITPIX32)l_long;
break;
case typ_bitpixm32:
if (fits_scanfdouble (l_card+10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_bitpixm32");
ErrCount++;
break;
}
data.bitpixm32 = (FITS_BITPIXM32)l_double;
break;
case typ_bitpixm64:
if (fits_scanfdouble (l_card+10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_bitpixm64");
ErrCount++;
break;
}
data.bitpixm64 = (FITS_BITPIXM64)l_double;
break;
case typ_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 typ_fbool");
ErrCount++;
break;
}
break;
case typ_flong:
if (sscanf (l_card+10, "%ld", &l_long) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_flong");
ErrCount++;
break;
}
data.flong = (FITS_BITPIX32)l_long;
break;
case typ_fdouble:
if (fits_scanfdouble (l_card+10, &l_double) != 1)
{
fits_set_error ("fits_decode_card: error decoding typ_fdouble");
ErrCount++;
break;
}
data.fdouble = (FITS_BITPIXM32)l_double;
break;
case typ_fstring:
cp = l_card+10;
if (*cp != '\'')
{
fits_set_error ("fits_decode_card: missing \' decoding typ_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: */
/* FITS_RECORD_LIST *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 reord 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 */
/*****************************************************************************/
char *fits_search_card (FITS_RECORD_LIST *rl, char *keyword)
{int key_len, k;
char *card;
char 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)
{
card = (char *)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: */
/* FITS_FILE *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 FITS_HDU_LIST. hdupicind */
/* then gives the index of the image within the HDU. */
/* On failure, NULL is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
FITS_HDU_LIST *fits_image_info (FITS_FILE *ff, int picind, int *hdupicind)
{FITS_HDU_LIST *hdulist;
int 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: */
/* FITS_FILE *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 FITS_HDU_LIST. This pointer*/
/* must also be used when reading data from the image. */
/* On failure, NULL is returned. */
/* */
/* #END-PAR */
/*****************************************************************************/
FITS_HDU_LIST *fits_seek_image (FITS_FILE *ff, int picind)
{FITS_HDU_LIST *hdulist;
int hdupicind;
long 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: */
/* FITS_FILE *ff [I] : FITS file structure */
/* FITS_HDU_LIST *hdulist [I] : pointer to hdulist that describes image */
/* int npix [I] : number of pixel values to read */
/* FITS_PIX_TRANSFORM *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 */
/*****************************************************************************/
int fits_read_pixel (FITS_FILE *ff, FITS_HDU_LIST *hdulist, int npix,
FITS_PIX_TRANSFORM *trans, void *buf)
{double offs, scale;
double datadiff, pixdiff;
unsigned char pixbuffer[4096], *pix, *cdata;
unsigned char creplace;
int transcount = 0;
long tdata, tmin, tmax;
int maxelem;
FITS_BITPIX8 bp8, bp8blank;
FITS_BITPIX16 bp16, bp16blank;
FITS_BITPIX32 bp32, bp32blank;
FITS_BITPIXM32 bpm32;
FITS_BITPIXM64 bpm64;
/* initialize */
bpm32 = 0;
if (ff->openmode != 'r') return (-1); /* Not open for reading */
if (trans->dsttyp != 'c') return (-1); /* Currently we only return chars */
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 = (long)trans->datamin;
tmax = (long)trans->datamax;
if (tmin < 0) tmin = 0; else if (tmin > 255) tmin = 255;
if (tmax < 0) tmax = 0; else if (tmax > 255) tmax = 255;
cdata = (unsigned char *)buf;
creplace = (unsigned char)trans->replacement;
switch (hdulist->bitpix)
{
case 8:
while (npix > 0) /* For all pixels to read */
{
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix) maxelem = npix;
if (fread ((char *)pixbuffer, hdulist->bpp, maxelem, ff->fp) != maxelem)
return (-1);
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp8blank = (FITS_BITPIX8)hdulist->blank;
while (maxelem--)
{
bp8 = (FITS_BITPIX8)*(pix++);
if (bp8 == bp8blank) /* Is it a blank pixel ? */
*(cdata++) = creplace;
else /* Do transform */
{
tdata = (long)(bp8 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
}
transcount++;
}
}
else
{
while (maxelem--)
{
bp8 = (FITS_BITPIX8)*(pix++);
tdata = (long)(bp8 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
transcount++;
}
}
}
break;
case 16:
while (npix > 0) /* For all pixels to read */
{
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix) maxelem = npix;
if (fread ((char *)pixbuffer, hdulist->bpp, maxelem, ff->fp) != maxelem)
return (-1);
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp16blank = (FITS_BITPIX16)hdulist->blank;
while (maxelem--)
{
FITS_GETBITPIX16 (pix, bp16);
if (bp16 == bp16blank)
*(cdata++) = creplace;
else
{
tdata = (long)(bp16 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
}
transcount++;
pix += 2;
}
}
else
{
while (maxelem--)
{
FITS_GETBITPIX16 (pix, bp16);
tdata = (long)(bp16 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
transcount++;
pix += 2;
}
}
}
break;
case 32:
while (npix > 0) /* For all pixels to read */
{
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix) maxelem = npix;
if (fread ((char *)pixbuffer, hdulist->bpp, maxelem, ff->fp) != maxelem)
return (-1);
npix -= maxelem;
pix = pixbuffer;
if (hdulist->used.blank)
{
bp32blank = (FITS_BITPIX32)hdulist->blank;
while (maxelem--)
{
FITS_GETBITPIX32 (pix, bp32);
if (bp32 == bp32blank)
*(cdata++) = creplace;
else
{
tdata = (long)(bp32 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
}
transcount++;
pix += 4;
}
}
else
{
while (maxelem--)
{
FITS_GETBITPIX32 (pix, bp32);
tdata = (long)(bp32 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
transcount++;
pix += 4;
}
}
}
break;
case -32:
while (npix > 0) /* For all pixels to read */
{
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix) maxelem = npix;
if (fread ((char *)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++) = creplace;
else /* Do transform */
{
FITS_GETBITPIXM32 (pix, bpm32);
tdata = (long)(bpm32 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
}
transcount++;
pix += 4;
}
}
break;
case -64:
while (npix > 0) /* For all pixels to read */
{
maxelem = sizeof (pixbuffer) / hdulist->bpp;
if (maxelem > npix) maxelem = npix;
if (fread ((char *)pixbuffer, hdulist->bpp, maxelem, ff->fp) != maxelem)
return (-1);
npix -= maxelem;
pix = pixbuffer;
while (maxelem--)
{
if (fits_nan_64 (pix))
*(cdata++) = creplace;
else
{
FITS_GETBITPIXM64 (pix, bpm64);
tdata = (long)(bpm64 * scale + offs);
if (tdata < tmin) tdata = tmin;
else if (tdata > tmax) tdata = tmax;
*(cdata++) = (unsigned char)tdata;
}
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 */
/*****************************************************************************/
int fits_to_pgmraw (char *fitsfile, char *pgmfile)
{FITS_FILE *fitsin = NULL;
FILE *pgmout = NULL;
FITS_HDU_LIST *hdu;
FITS_PIX_TRANSFORM trans;
int retval = -1, nbytes, maxbytes;
char 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 */
/*****************************************************************************/
int pgmraw_to_fits (char *pgmfile, char *fitsfile)
{FITS_FILE *fitsout = NULL;
FILE *pgmin = NULL;
FITS_HDU_LIST *hdu;
char buffer[1024];
int width, height, numbytes, maxbytes;
int 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 upto 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 upto 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