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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <imhdr.h>
include "imfort.h"
include "imhv1.h"
include "imhv2.h"
include "oif.h"
# IMRDHDR -- Read the image header. Either the main image header or the
# pixel file header can be read.
int procedure imrdhdr (fp, im, uchars, htype)
pointer fp #I header file descriptor
pointer im #I image descriptor
int uchars #I maxchars of user area data to read
int htype #I TY_IMHDR or TY_PIXHDR
pointer sp, v1
char immagic[SZ_IMMAGIC]
int sulen_userarea, hdrlen, nchars, status
bool streq()
int i_miirdc(), i_miirdi(), i_miirdl(), i_miirdr()
int btoi(), bfrseq(), bfseek()
define readerr_ 91
begin
# Determine the file type.
if (bfseek (fp, BOFL) == ERR)
return (ERR)
if (bfrseq (fp, immagic, SZ_IMMAGIC) != SZ_IMMAGIC)
return (ERR)
if (htype == TY_PIXHDR && streq (immagic, V1_PMAGIC)) {
# V1 Pixel file header.
return (OK)
} else if (htype == TY_IMHDR && streq (immagic, V1_MAGIC)) {
# Old V1 image header.
call smark (sp)
call salloc (v1, LEN_V1IMHDR, TY_STRUCT)
if (bfseek (fp, BOFL) == ERR) {
call sfree (sp)
return (ERR)
}
nchars = LEN_V1IMHDR * SZ_MII_INT
if (bfrseq (fp, IM_V1MAGIC(v1), nchars) != nchars) {
call sfree (sp)
return (ERR)
}
# Initialize the output image header.
call strcpy (IMH_MAGICSTR, IM_MAGIC(im), SZ_IMMAGIC)
IM_HDRVER(im) = V1_VERSION
# The following is the length of the user area in SU.
sulen_userarea = IM_V1HDRLEN(v1) - LEN_V1IMHDR
IM_HDRLEN(im) = LEN_IMHDR + sulen_userarea
IM_SWAP(im) = NO
IM_SWAPPED(im) = -1
IM_PIXTYPE(im) = IM_V1PIXTYPE(v1)
IM_NDIM(im) = IM_V1NDIM(v1)
call amovl (IM_V1LEN(v1,1), IM_LEN(im,1), IM_MAXDIM)
call amovl (IM_V1PHYSLEN(v1,1), IM_PHYSLEN(im,1), IM_MAXDIM)
IM_SSMTYPE(im) = IM_V1SSMTYPE(v1)
IM_LUTOFF(im) = IM_V1LUTOFF(v1)
IM_PIXOFF(im) = IM_V1PIXOFF(v1)
IM_HGMOFF(im) = IM_V1HGMOFF(v1)
IM_CTIME(im) = IM_V1CTIME(v1)
IM_MTIME(im) = IM_V1MTIME(v1)
IM_LIMTIME(im) = IM_V1LIMTIME(v1)
IM_MAX(im) = IM_V1MAX(v1)
IM_MIN(im) = IM_V1MIN(v1)
call strcpy (IM_V1PIXFILE(v1), IM_PIXFILE(im), SZ_IMPIXFILE)
call strcpy (IM_V1HDRFILE(v1), IM_HDRFILE(im), SZ_IMHDRFILE)
call strcpy (IM_V1TITLE(v1), IM_TITLE(im), SZ_IMTITLE)
call strcpy (IM_V1HISTORY(v1), IM_HISTORY(im), SZ_IMHIST)
# Read and output the user area.
if (uchars > 0) {
nchars = min (uchars, sulen_userarea * SZ_MII_INT)
if (bfrseq (fp, Memc[IM_USERAREA(im)], nchars) <= 0)
return (ERR)
}
call sfree (sp)
return (OK)
}
# Check for a new format header.
if (bfseek (fp, BOFL) == ERR)
return (ERR)
if (i_miirdc (fp, immagic, SZ_IMMAGIC) < 0)
return (ERR)
if (htype == TY_PIXHDR && streq (immagic, V2_PMAGIC)) {
# V2 Pixel file header.
return (OK)
} else if (htype == TY_IMHDR && streq (immagic, V2_MAGIC)) {
# Newer V2 image header.
status = ERR
# Initialize the output image header.
call strcpy (IMH_MAGICSTR, IM_MAGIC(im), SZ_IMMAGIC)
IM_HDRVER(im) = V2_VERSION
# "sulen_userarea" is the length of the user area in SU.
if (i_miirdi (fp, hdrlen, 1) != 1)
goto readerr_
sulen_userarea = hdrlen - LEN_V2IMHDR
IM_HDRLEN(im) = LEN_IMHDR + sulen_userarea
if (i_miirdi (fp, IM_PIXTYPE(im), 1) != 1)
goto readerr_
# Determine whether to byte swap the pixels.
if (i_miirdi (fp, IM_SWAPPED(im), 1) != 1)
goto readerr_
IM_SWAP(im) = NO
switch (IM_PIXTYPE(im)) {
case TY_SHORT, TY_USHORT:
IM_SWAP(im) = btoi (IM_SWAPPED(im) != BYTE_SWAP2)
case TY_INT, TY_LONG:
IM_SWAP(im) = btoi (IM_SWAPPED(im) != BYTE_SWAP4)
case TY_REAL:
if (IEEE_USED == YES)
IM_SWAP(im) = btoi (IM_SWAPPED(im) != IEEE_SWAP4)
case TY_DOUBLE:
if (IEEE_USED == YES)
IM_SWAP(im) = btoi (IM_SWAPPED(im) != IEEE_SWAP8)
}
# Read the fixed-format fields of the header.
if (i_miirdi (fp, IM_NDIM(im), 1) < 0)
goto readerr_
if (i_miirdi (fp, IM_LEN(im,1), IM_MAXDIM) < 0)
goto readerr_
if (i_miirdl (fp, IM_PHYSLEN(im,1), IM_MAXDIM) < 0)
goto readerr_
if (i_miirdl (fp, IM_SSMTYPE(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_LUTOFF(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_PIXOFF(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_HGMOFF(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_BLIST(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_SZBLIST(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_NBPIX(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_CTIME(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_MTIME(im), 1) < 0)
goto readerr_
if (i_miirdl (fp, IM_LIMTIME(im), 1) < 0)
goto readerr_
if (i_miirdr (fp, IM_MAX(im), 1) < 0)
goto readerr_
if (i_miirdr (fp, IM_MIN(im), 1) < 0)
goto readerr_
if (i_miirdc (fp, IM_PIXFILE(im), SZ_V2IMPIXFILE) < 0)
goto readerr_
if (i_miirdc (fp, IM_HDRFILE(im), SZ_V2IMHDRFILE) < 0)
goto readerr_
if (i_miirdc (fp, IM_TITLE(im), SZ_V2IMTITLE) < 0)
goto readerr_
if (i_miirdc (fp, IM_HISTORY(im), SZ_V2IMHIST) < 0)
goto readerr_
# Read the variable-length user area.
if (uchars > 0) {
nchars = min (uchars, sulen_userarea * SZ_MII_INT)
if (i_miirdc (fp, Memc[IM_USERAREA(im)], nchars) < 0)
goto readerr_
}
status = OK
readerr_
return (status)
}
return (ERR)
end
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