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/* pnmtofits.c - read a portable anymap and produce a FITS file
**
** Copyright (C) 1989 by Wilson H. Bent (whb@hoh-2.att.com).
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
**
** Modified by Alberto Accomazzi (alberto@cfa.harvard.edu), Dec 1, 1992.
**
** Added support for PPM files, the program is renamed pnmtofits.
** This program produces files with NAXIS = 2 if input file is in PBM
** or PGM format, and NAXIS = 3, NAXIS3 = 3 if input file is a PPM file.
** Data is written out as either 8 bits/pixel or 16 bits/pixel integers,
** depending on the value of maxval in the input file.
** Flags -max, -min can be used to set DATAMAX, DATAMIN, BSCALE and BZERO
** in the FITS header, but do not cause the data to be rescaled.
*/
#include "pnm.h"
#define write_card(s) fwrite( s, sizeof(char), 80, stdout )
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
xel** xels;
xel* xelrow;
register xel* xP;
int argn, row, col, rows, cols, planes, format, i, npad,
bitpix, forcemin, forcemax;
double datamin, datamax, bscale, fits_bzero, frmax, frmin;
xelval maxval;
register unsigned short color;
char card[81];
char* usage = "[-max f] [-min f] [pnmfile]";
pnm_init( &argc, argv );
forcemin = 0;
forcemax = 0;
argn = 1;
while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-max", 3 ) )
{
++argn;
forcemax = 1;
if ( argn == argc || sscanf( argv[argn], "%lf", &frmax ) != 1 )
pm_usage( usage );
}
else if ( pm_keymatch( argv[argn], "-min", 3 ) )
{
++argn;
forcemin = 1;
if ( argn == argc || sscanf( argv[argn], "%lf", &frmin ) != 1 )
pm_usage( usage );
}
else
pm_usage( usage );
++argn;
}
if ( argn != argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
xels = pnm_readpnm( ifp, &cols, &rows, &maxval, &format );
datamin = 0.0;
datamax = (double) maxval;
if (forcemin) datamin = frmin;
if (forcemax) datamax = frmax;
fits_bzero = datamin;
bscale = ( datamax - datamin ) / ( double ) maxval;
bitpix = 8;
if (maxval > 255) bitpix = 16;
pm_close( ifp );
/* Figure out the proper depth */
switch ( PNM_FORMAT_TYPE(format) )
{
case PPM_TYPE:
planes = 3;
break;
default:
planes = 1;
break;
}
/* write out fits header */
i = 0;
sprintf( card, "SIMPLE = T " );
write_card( card ); ++i;
sprintf( card, "BITPIX = %10d ", bitpix );
write_card( card ); ++i;
sprintf( card, "NAXIS = %10d ", ( planes == 3 ) ? 3 : 2 );
write_card( card ); ++i;
sprintf( card, "NAXIS1 = %10d ", cols );
write_card( card ); ++i;
sprintf( card, "NAXIS2 = %10d ", rows );
write_card( card ); ++i;
if ( planes == 3 )
{
sprintf( card, "NAXIS3 = 3 " );
write_card( card ); ++i;
}
sprintf( card, "BSCALE = %lE ", bscale );
write_card( card ); ++i;
sprintf( card, "BZERO = %lE ", fits_bzero );
write_card( card ); ++i;
sprintf( card, "DATAMAX = %lE ", datamax );
write_card( card ); ++i;
sprintf( card, "DATAMIN = %lE ", datamin );
write_card( card ); ++i;
sprintf( card, "HISTORY Created by pnmtofits. " );
write_card( card ); ++i;
sprintf( card, "END " );
write_card( card ); ++i;
/* pad end of header with blanks */
npad = ( i * 80 ) % 2880;
if ( npad == 0 )
npad = 2880;
while ( npad++ < 2880 )
putchar ( ' ' );
for ( i = 0; i < planes; i++ )
for ( row = 0; row < rows; ++row )
{
xelrow = xels[row];
for ( col = 0, xP = xelrow; col < cols; ++col, ++xP )
{
if ( planes == 3 )
{
/* we are reading a ppm file */
if ( i == 0 ) color = PPM_GETR( *xP );
else if ( i == 1 ) color = PPM_GETG( *xP );
else color = PPM_GETB( *xP );
}
else
color = PNM_GET1( *xP );
if ( bitpix == 16 )
putchar( ( color >> 8 ) & 0xff );
putchar( color & 0xff );
}
}
/* pad end of file with nulls */
npad = ( rows * cols * planes * bitpix / 8 ) % 2880;
if ( npad == 0 )
npad = 2880;
while ( npad++ < 2880 )
putchar ( 0 );
exit( 0 );
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.