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/* mcidas.c:
*
* McIDAS areafile support. contributed by Glenn P. Davis
* (davis@unidata.ucar.edu).
*/
#include "xloadimage.h"
#include "mcidas.h"
char *mc_sensor();
static struct {
int days;
char *name;
} month_info[13] = {
{ 0, "Pad" },
{ 31, "Jan" },
{ 29, "Feb" }, /* longest */
{ 31, "Mar" },
{ 30, "Apr" },
{ 31, "May" },
{ 30, "Jun" },
{ 31, "Jul" },
{ 31, "Aug" },
{ 30, "Sep" },
{ 31, "Oct" },
{ 30, "Nov" },
{ 31, "Dec" }
};
/* convert numeric dates to human-readable
*/
static char *convert_date(time, date)
int time, date;
{ static char buf[30];
int hour;
int minute;
int second;
int year;
int month;
int day;
year = date / 1000;
if (year > 50) /* gives us a range from 1950 - 2050, probably good enough */
year += 1900;
else
year += 2000;
day = date % 1000;
/* adjust day for non-leap-years if necessary
*/
if ((day > 31 + 28) && ((year % 4) || (year == 2000)))
day++;
/* find month in year that this day falls in
*/
for (month= 1; day > month_info[month].days; day -= month_info[month].days)
month++;
/* break time-of-day up
*/
hour = time / 10000;
minute = (time % 10000) / 100;
second = (time % 100);
snprintf(buf, 29, "%d:%2.2d:%2.2d %s %d, %d (day %d)",
hour, minute, second, month_info[month].name, day, year,
(date % 1000));
return(buf);
}
/*
* convert from little endian to big endian four byte object
*/
static unsigned long
vhtonl(lend)
unsigned long lend ;
{
unsigned long bend ;
unsigned char *lp, *bp ;
lp = ((unsigned char *)&lend) + 3 ;
bp = (unsigned char *) &bend ;
*bp++ = *lp-- ;
*bp++ = *lp-- ;
*bp++ = *lp-- ;
*bp = *lp ;
return(bend) ;
}
static void babble(name, dir)
char *name;
struct area_dir *dir;
{
printf("%s is a %ldx%ld McIDAS areafile from %s at %s (%ld, %ld) (%ld, %ld)\n",
name,
dir->esiz, dir->lsiz,
mc_sensor(dir->satid),
convert_date(dir->itime, dir->idate),
dir->lcor,
dir->ecor,
dir->lres,
dir->eres) ;
}
static void swap_bytes(dir)
struct area_dir *dir;
{
unsigned long *begin ;
unsigned long *ulp ;
begin = (unsigned long *)dir ;
for(ulp = begin ; ulp < &begin[AREA_COMMENTS] ; ulp++)
*ulp = vhtonl(*ulp) ;
for(ulp = &begin[AREA_CALKEY] ; ulp < &begin[AREA_STYPE] ; ulp++)
*ulp = vhtonl(*ulp) ;
}
/* ARGSUSED */
int mcidasIdent(fullname, name)
char *fullname, *name;
{ ZFILE *zf;
struct area_dir dir ;
int r;
if (! (zf= zopen(fullname))) {
perror("mcidasIdent");
return(0);
}
switch (zread(zf, (byte *)&dir, sizeof(struct area_dir))) {
case -1:
perror("mcidasIdent");
r= 0;
break;
case sizeof(struct area_dir):
if (memToValLSB((char *)&dir.type, 4) != 4) {
r= 0;
break;
}
if (dir.type != 4)
swap_bytes(&dir);
babble(name, &dir);
r= 1;
break;
default:
r= 0;
break;
}
zclose(zf);
return(r);
}
Image *mcidasLoad(fullname, name, verbose)
char *fullname, *name;
unsigned int verbose;
{ ZFILE *zf;
struct area_dir dir;
struct navigation nav;
Image *image;
unsigned int y;
if (! (zf= zopen(fullname))) {
perror("mcidasLoad");
return(NULL);
}
switch (zread(zf, (byte *)&dir, sizeof(struct area_dir))) {
case -1:
perror("mcidasLoad");
zclose(zf);
exit(1);
case sizeof(struct area_dir):
if (memToValLSB((char *)&dir.type, 4) != 4) {
zclose(zf);
return(NULL) ;
}
if (dir.type != 4)
swap_bytes(&dir);
break;
default:
zclose(zf);
return(NULL);
}
if (verbose)
babble(name, &dir);
znocache(zf);
/* skip the nav */
if( zread(zf, (byte *)&nav, sizeof(struct navigation)) !=
sizeof(struct navigation)) {
zclose(zf);
return(NULL) ;
}
/* get an image to put the data in
*/
image= newRGBImage(dir.esiz, dir.lsiz, dir.zsiz * 8);
/* set up the colormap, linear grey scale
*/
for (y= 0; y < image->rgb.size; y++) {
*(image->rgb.red + y)=
*(image->rgb.green + y)=
*(image->rgb.blue + y)= y * (65536 / image->rgb.size) ;
}
image->rgb.used= image->rgb.size ;
/* read the first band from the image and warn if there are other bands
* we can't read.
*/
zread(zf, image->data, dir.esiz * dir.lsiz * dir.zsiz) ;
if (dir.bands > 1)
printf("Warning: Only showing first of %ld bands\n", dir.bands);
zclose(zf);
image->title= dupString(name);
return(image);
}
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