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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mii.h>
# MIIREAD -- Read a block of data stored externally in MII format.
# Data is returned in the format of the local host machine.
int procedure mii_read$t (fd, spp, maxelem)
int fd #I input file
PIXEL spp[ARB] #O receives data
int maxelem # max number of data elements to be read
pointer sp, bp
int pksize, nchars, nelem
int miipksize(), miinelem(), read()
errchk read()
long note()
begin
pksize = miipksize (maxelem, MII_PIXEL)
nelem = EOF
if (pksize > maxelem * SZ_PIXEL) {
# Read data into local buffer and unpack into user buffer.
call smark (sp)
call salloc (bp, pksize, TY_CHAR)
nchars = read (fd, Memc[bp], pksize)
if (nchars != EOF) {
nelem = min (maxelem, miinelem (nchars, MII_PIXEL))
call miiupk$t (Memc[bp], spp, nelem, TY_PIXEL)
}
call sfree (sp)
} else {
# Read data into user buffer and unpack in place.
nchars = read (fd, spp, pksize)
if (nchars != EOF) {
nelem = min (maxelem, miinelem (nchars, MII_PIXEL))
call miiupk$t (spp, spp, nelem, TY_PIXEL)
}
}
return (nelem)
end
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