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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <knet.h>
include "iis.h"
# IISPIO -- Pixel i/o to the IIS.
procedure iispio (buf, ny)
short buf[IIS_XDIM,ny] # Cell array
int ny # number of image lines
pointer iobuf
bool first_time
int xferid, status, npacked, szline, i
int and()
include "iis.com"
data first_time /true/
begin
if (first_time) {
call malloc (iobuf, IIS_MAXBUFSIZE, TY_CHAR)
first_time = false
}
# Wait for the last i/o transfer.
call iiswt (iischan, status)
if (status == ERR)
return
# Transmit the packet header.
call zawrgd (iischan, hdr, SZB_IISHDR, 0)
call iiswt (iischan, status)
if (status == ERR)
return
# Read or write the data block.
npacked = ny * IIS_XDIM
szline = IIS_XDIM / (SZ_SHORT * SZB_CHAR)
# Transmit the data byte-packed to increase the i/o bandwith
# when using network i/o.
xferid = XFERID(hdr)
if (and (xferid, IREAD) != 0) {
# Read from the IIS.
call zardgd (iischan, Memc[iobuf], npacked, 0)
call iiswt (iischan, status)
# Unpack and line flip the packed data.
do i = 0, ny-1
call achtbs (Memc[iobuf+i*szline], buf[1,ny-i], IIS_XDIM)
} else {
# Write to the IIS.
# Bytepack the image lines, doing a line flip in the process.
do i = 0, ny-1
call achtsb (buf[1,ny-i], Memc[iobuf+i*szline], IIS_XDIM)
call zawrgd (iischan, Memc[iobuf], npacked, 0)
}
end
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