/usr/lib/iraf/lib/imio.h is in iraf-dev 2.16.1+2018.03.10-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | # IMIO.H -- IMIO internal definitions.
define DEF_PIXTYPE TY_REAL # pixel type on disk
define DEF_HGMLEN 512 # length of histogram
define DEF_COMPRESS NO # align lines on blk boundaries
define DEF_ADVICE SEQUENTIAL # type of access to optimize for
define DEF_FIOBUFFRAC 10 # FIO buf as percent of image
define DEF_FIOBUFSIZE 262144 # default FIO buffer size
define DEF_MAXFIOBUFSIZE 16777216 # "soft" max FIO buffer size
define MAX_HGMLEN 2048 # maximum size histogram
define IM_MAXSTEP 64 # step size breakpoint
define MIN_LENUSERAREA 64000 # user area size (chars)
define SZ_UAPAD 5120 # padding at end of UA if copy
define SZ_IMNAME 128 # IM_NAME field (prev 79)
define ENV_BUFSIZE "IMIO_BUFSIZE" # envvar for bufsize
define ENV_BUFFRAC "IMIO_BUFFRAC" # envvar for buffrac
define ENV_BUFMAX "IMIO_BUFMAX" # envvar for bufmax
define LOOP_DONE 1 # used by IMLOOP
define LOOP_AGAIN 0
define IM_READ 0 # used by IMCSSZ
define IM_WRITE 1
# The IMIO runtime Image Descriptor Structure.
define LEN_IMDES 200
define IM_FILESIZE Meml[$1] # size of pixfile
define IM_NGET Meml[$1+1] # number getpix calls
define IM_ACMODE Memi[$1+2] # access mode (ro, rw, etc.)
define IM_VNBUFS Memi[$1+3] # number of in buffers
define IM_VCOMPRESS Memi[$1+4] # if YES, len[i] == physlen[i]
define IM_VADVICE Memi[$1+5] # expected type of access
define IM_VBUFSIZE Memi[$1+6] # recommended FIO buffer size
define IM_VBUFFRAC Memi[$1+7] # FIO buffer as image fraction
define IM_VBUFMAX Memi[$1+8] # max FIO buffer size
define IM_VCLOSEFD Memi[$1+9] # set F_CLOSEFD on pixfile
define IM_VNBNDRYPIX Memi[$1+10] # npixels of boundary extension
define IM_VTYBNDRY Memi[$1+11] # type of boundary extension
define IM_VFLAGBADPIX Memi[$1+12] # flag bad pixels upon input
define IM_FLUSH Memi[$1+13] # flush outbuf?
define IM_UPDATE Memi[$1+14] # update header?
define IM_FLUSHEPA Memi[$1+15] # epa of imfls? routine
define IM_IBDES Memi[$1+16] # input bufdes
define IM_OBDES Memi[$1+17] # output bufdes
define IM_LASTBDES Memi[$1+18] # last buffer accessed
define IM_OHDR Memi[$1+19] # if newcopy, ptr to old header
define IM_NPHYSDIM Memi[$1+20] # number of physical dims
define IM_SECTUSED Memi[$1+21] # image section in use
define IM_FAST Memi[$1+22] # fast i/o permitted
define IM_SWAP Memi[$1+23] # byte swapping required
define IM_SVMTIME Meml[$1+24] # new time of last modify
define IM_OOBPIX Memr[P2R($1+25)] # value for out of bounds pixels
define IM_KERNEL Memi[$1+26] # IKI kernel assigned (runtime)
define IM_KDES Memi[$1+27] # IKI kernel descriptor
define IM_HFD Memi[$1+28] # header file descriptor
define IM_PFD Memi[$1+29] # pixel file descriptor
define IM_LENHDRMEM Memi[$1+30] # descr. length, IM_MAGIC to end
define IM_UABLOCKED Memi[$1+31] # user area blocked, 80 chars
define IM_CLINDEX Memi[$1+32] # index of image in cluster
define IM_CLSIZE Memi[$1+33] # no. images in cluster
define IM_PL Memi[$1+34] # PL descriptor if mask image
define IM_PLREFIM Memi[$1+35] # PL reference image if any
define IM_PLFLAGS Memi[$1+36] # PL mask i/o flags
# (extra space)
define IM_SVLEN Meml[$1+$2+40-1] # save true axis lengths
define IM_VMAP Memi[$1+$2+47-1] # map section dimensions
define IM_VOFF Meml[$1+$2+54-1] # section offsets
define IM_VSTEP Memi[$1+$2+61-1] # section sample step size
define IM_NAME Memc[P2C($1+68)] # imagefile name
# (extra space)
# IM_PLFLAGS bit flags.
define PL_ACMODE mod($1,100B) # extract access mode
define PL_FLAGS (($1)/100B*100B) # extract flags bits
define PL_RLIO 1 # range list i/o desired
define PL_FAST 2 # no pixel conversions needed
define PL_CLOSEPL 4 # close descriptor at imunmap
define PL_BOOL 8 # boolean mask
# Buffer Descriptor Structure
define LEN_BDES 19
define BD_BUFPTR Memi[$1] # buffer pointer
define BD_DTYPE Memi[$1+1] # datatype of pixels
define BD_NPIX Memi[$1+2] # number of pixels in buf
define BD_NDIM Memi[$1+3] # dimensionality of section
define BD_BUFSIZE Memi[$1+4] # buffer size, chars
define BD_VS Meml[$1+$2+5-1] # section start vector
define BD_VE Meml[$1+$2+12-1] # section end vector
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