1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <imhdr.h>
include "imfort.h"
# IMGL3S -- Get a line from an image of type short. It is illegal to reference
# out of bounds.
procedure imgl3s (im, buf, lineno, bandno, ier)
pointer im # image descriptor
short buf[ARB] # user data buffer
int lineno # line number
int bandno # band number
int ier
long offset
int nchars, npix
int bfread()
begin
# Verify in bounds.
if (lineno < 1 || lineno > IM_LEN(im,2)) {
ier = IE_YOOB
call im_seterrim (ier, im)
return
} else if (bandno < 1 || bandno > IM_LEN(im,3)) {
ier = IE_ZOOB
call im_seterrim (ier, im)
return
}
# Verify that the image is of type short.
if (IM_PIXTYPE(im) != TY_SHORT) {
ier = IE_NOTSHORT
call im_seterrim (ier, im)
return
}
npix = IM_LEN(im,1)
nchars = npix * IM_SZPIXEL(im)
# Compute offset into pixel file.
offset = IM_PIXOFF(im) +
((bandno-1) * IM_LEN(im,2) + (lineno-1)) * IM_LINESIZE(im)
# Read one line of data.
if (nchars != bfread (IM_PIXFP(im), buf, nchars, offset)) {
ier = IE_RDPIX
call im_seterrim (ier, im)
return
}
# Swap bytes if necessary.
call imswap (im, buf, nchars)
ier = OK
end
|
