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/* $Id: flipx.c,v 1.10 2006/02/17 10:26:58 yjung Exp $
*
* This file is part of the ESO QFITS Library
* Copyright (C) 2001-2004 European Southern Observatory
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* $Author: yjung $
* $Date: 2006/02/17 10:26:58 $
* $Revision: 1.10 $
* $Name: qfits-6_2_0 $
*/
/*-----------------------------------------------------------------------------
Includes
-----------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include "qfits_rw.h"
#include "qfits_tools.h"
/*-----------------------------------------------------------------------------
Private functions
-----------------------------------------------------------------------------*/
/*
* Swap pixels between position p1 and p2, regardless of the pixel
* type and endian-ness of the local host.
*/
static void swap_pix(char * buf, int p1, int p2, int psize)
{
int i ;
char c ;
for (i=0 ; i<psize ; i++) {
c = buf[p1+i] ;
buf[p1+i] = buf[p2+i];
buf[p2+i] = c ;
}
}
/*
* Main processing function. It expects one only file name
* and will flip pixels on the input frame.
*/
static int fits_flip(char * pname, char * filename)
{
char * sval ;
int dstart;
int lx, ly ;
int bpp ;
int i, j ;
char * buf ;
char * fbuf ;
int psize;
struct stat fileinfo ;
int fd ;
printf("%s: processing %s\n", pname, filename);
if (stat(filename, &fileinfo)!=0) {
return -1 ;
}
if (fileinfo.st_size<1) {
printf("cannot stat file\n");
return -1 ;
}
/* Retrieve image attributes */
if (qfits_is_fits(filename)!=1) {
printf("not a FITS file\n");
return -1 ;
}
sval = qfits_query_hdr(filename, "NAXIS1");
if (sval==NULL) {
printf("cannot read NAXIS1\n");
return -1 ;
}
lx = atoi(sval);
sval = qfits_query_hdr(filename, "NAXIS2");
if (sval==NULL) {
printf("cannot read NAXIS2\n");
return -1 ;
}
ly = atoi(sval);
sval = qfits_query_hdr(filename, "BITPIX");
if (sval==NULL) {
printf("cannot read BITPIX\n");
return -1 ;
}
bpp = atoi(sval);
psize = bpp/8 ;
if (psize<0) psize=-psize ;
/* Retrieve start of first data section */
if (qfits_get_hdrinfo(filename, 0, &dstart, NULL)!=0) {
printf("reading header information\n");
return -1 ;
}
/* Map the input file in read/write mode (input file is modified) */
if ((fd=open(filename, O_RDWR))==-1) {
perror("open");
printf("reading file\n");
return -1 ;
}
fbuf = (char*)mmap(0,
fileinfo.st_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
0);
if (fbuf==(char*)-1) {
perror("mmap");
printf("mapping file\n");
return -1 ;
}
buf = fbuf + dstart ;
/* Double loop */
for (j=0 ; j<ly ; j++) {
for (i=0 ; i<lx/2 ; i++) {
/* Swap bytes */
swap_pix(buf, i*psize, (lx-i-1)*psize, psize);
}
buf += lx * psize ;
}
if (munmap(fbuf, fileinfo.st_size)!=0) {
printf("unmapping file\n");
return -1 ;
}
return 0 ;
}
/*-----------------------------------------------------------------------------
Main
-----------------------------------------------------------------------------*/
int main(int argc, char * argv[])
{
int i ;
int err ;
if (argc<2) {
printf("use: %s <list of FITS files...>\n", argv[0]);
return 1 ;
}
err=0 ;
for (i=1 ; i<argc ; i++) {
err += fits_flip(argv[0], argv[i]) ;
}
if (err>0) {
fprintf(stderr, "%s: %d error(s) occurred\n", argv[0], err);
return -1 ;
}
return 0 ;
}
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