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PDSREAD (Program Structure) PDSREAD (Program Structure)
PDS Structure Chart
t_pdsread()
# Returns when file list is satified or if EOT is encountered.
# Errors from called routines are trapped and printed as a warning.
read_pds
# Returns OK or EOF
read_header
# Returns OK or EOF
init_read_pixels
# Returns OK
read_pixels
# Returns OK
decode_header
decode_text
decode_parameters
print_header
read_image
set_image_header
init_read_pixels
read_pixels
PDSREAD Structure Summary
t_pdsread
The main procedure reads the control parameters. The files to be
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_PDS for each conversion.
read_pds
The input source is opened and the output header file is
-1-
PDSREAD (Program Structure) PDSREAD (Program Structure)
created. If only the PDS header is to be listed then a
temporary image header file is created. The PDS header is
read and decoded into the IRAF image header by READ_HEADER.
If make_image is true then READ_IMAGE is called. Finally all
the files are closed. If a temporary image header file was
created it is deleted.
read_header
The PDS header is read into an array of text and an an
array of parameters using INIT_READ_PIXEL and READ_PIXEL.
These arrays are passed to DECODE_HEADER and subsequently
printed on the standard output. The routine returns OK or
EOF. Errors are returned by the error handler.
init_read_pixels
The pixel reading routine is initialized.
read_pixels
The pixels are read into a record buffer.
decode_header
Decodes the text portion of the header using
DECODE_TEXT and DECODE_PARAMETERS.
decode_text
Converts the id string from 059 code to 8 bit
ASCII.
decode_parameters
Decodes the PDS scan parameters.
print_header
If the short_header switch is set then the image title
and size are printed. If the long_header switch is
set then all the header information is printed.
read_image
The PDS image pixels are converted to an IRAF image file.
The image file header is set using SET_IMAGE_HEADER. The
lines of the image are converted one at a time.
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 pds.h.
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