.help rcamera 2 "Program Structure"
.sh
RCAMERA Structure Chart

.nf
t_rcamera ()
# Returns when file list is satisfied or if EOT is encountered
# Errors from called routines are trapped and printed as a warning.

	read_camera (camfile, iraffile)
	# Returns OK or EOF

		read_header (cam_fd, im)
		# Returns OK or EOF

			decode_camera (im, parameters, text)

			prheader (parameters, text)

	    			prcam (parameters, text)

					prcam1  (parameters, text)

		read_image (cam_fd, im)
		# Invokes error handler if EOF is encountered

			set_image_header (im)

			init_read_pixels (npix_record, bitpix, lsbf, spp_type)
			# Returns OK

			read_pixels (fd, buffer, npix)
			# Returns EOF or the number of pixels converted
.fi

.sh
RCAMERA Structure Summary

.ls 4 t_rcamera
The main procedure reads the control parameters.
The files to be read and converted are calculated from the specified source
and file list.  A loop through
the files determines the specific input source names and output filenames
and calls READ_CAMERA for each conversion.
.ls read_camera
The input source is opened and the output image header file is created.
If only the CAMERA header is to be listed then a temporary image header file
is created.  The CAMERA header is read and decoded into the IRAF image
header by READ_HEADER.  If the image is to be read then MAKE_IMAGE is
called.  Finally, all files are closed.  If a temporary image header file
was created it is deleted.
.ls read_header
The CAMERA header is read into an array of short parameters and a
character array of text.  If EOF is encountered
then EOF is returned.  The parameter and text arrays are passed to
DECODE_CAMERA to set the IRAF image file header.  The arrays are also
passed to PRHEADER to print the header information.
The routine returns OK if the header was successfully read or EOF
if encountered.  All other errors are returned
via the error handler.
.ls decode_camera
The appropriate parameters are taken from the CAMERA header and put into
the IRAF image file header.
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.ls prheader
If the short_header switch is set then the image title and size are printed.
If the long_header switch is set then PRCAM is called to print the long
header.
.ls prcam
The CAMERA header information is formatted and printed.  Because of a string
limitation in the SPP half of the header information must be printed by
a call to PRCAM1.
.ls prcam1
The second half of the CAMERA header information is formatted and printed.
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.ls read_image
The CAMERA image pixels are converted to an IRAF image file.
The image file header is set.
The lines of the image are converted one at a time.
.ls set_image_header
The pixel type for the IRAF image is set to the user specified type.
If no type has been specified then the type is determined from the number
of bits per pixel given in camera.h.
.le
.ls init_read_pixels
The pixel reading routine is initialized.  The parameters are the number
of pixels per record, the number of bits per pixel which must be a
valid MII type, a byte order flag, and the SPP data type to be converted
to.  In the CAMERA reader the byte order is specified to be least significant
byte first and the SPP data type is TY_SHORT.
.le
.ls read_pixels
The pixels are read into a record buffer.  Data conversion is accomplished
with an initial byte swap to put the input in most significant byte first
form and then the MII routines are called.   The
specified number of pixels is returned in the specified buffer.
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.endhelp