def _makehdu(data, header):
if header is None:
header = Header()
hdu = _BaseHDU(data, header)
if hdu.__class__ in (_BaseHDU, _ValidHDU):
# The HDU type was unrecognized, possibly due to a
# nonexistent/incomplete header
if ((isinstance(data, np.ndarray) and data.dtype.fields is not None)
or isinstance(data, np.recarray)):
hdu = BinTableHDU(data)
elif isinstance(data, np.ndarray):
hdu = ImageHDU(data)
else:
raise KeyError('Data must be a numpy array.')
return hdu
def __init__(self, name, header):
"""
Construct a `StreamingHDU` object given a file name and a header.
Parameters
----------
name : file path, file object, or file like object
The file to which the header and data will be streamed.
If opened, the file object must be opened for append
(ab+).
header : `Header` instance
The header object associated with the data to be written
to the file.
Notes
-----
The file will be opened and the header appended to the end of
the file. If the file does not already exist, it will be
created, and if the header represents a Primary header, it
will be written to the beginning of the file. If the file
does not exist and the provided header is not a Primary
header, a default Primary HDU will be inserted at the
beginning of the file and the provided header will be added as
the first extension. If the file does already exist, but the
provided header represents a Primary header, the header will
be modified to an image extension header and appended to the
end of the file.
"""
if isinstance(name, gzip.GzipFile):
raise TypeError('StreamingHDU not supported for GzipFile objects.')
self._header = header.copy()
# handle a file object instead of a file name
filename = fileobj_name(name) or ''
#
# Check if the file already exists. If it does not, check to see
# if we were provided with a Primary Header. If not we will need
# to prepend a default PrimaryHDU to the file before writing the
# given header.
#
newfile = False
if filename:
if not os.path.exists(filename) or os.path.getsize(filename) == 0:
newfile = True
elif (hasattr(name, 'len') and name.len == 0):
newfile = True
if newfile:
if 'SIMPLE' not in self._header:
hdulist = HDUList([PrimaryHDU()])
hdulist.writeto(name, 'exception')
else:
#
# This will not be the first extension in the file so we
# must change the Primary header provided into an image
# extension header.
#
if 'SIMPLE' in self._header:
self._header.set('XTENSION', 'IMAGE', 'Image extension',
after='SIMPLE')
del self._header['SIMPLE']
if 'PCOUNT' not in self._header:
dim = self._header['NAXIS']
if dim == 0:
dim = ''
else:
dim = str(dim)
self._header.set('PCOUNT', 0, 'number of parameters',
after='NAXIS' + dim)
if 'GCOUNT' not in self._header:
self._header.set('GCOUNT', 1, 'number of groups',
after='PCOUNT')
self._ffo = _File(name, 'append')
# TODO : Fix this once the HDU writing API is cleaned up
tmp_hdu = _BaseHDU()
# Passing self._header as an argument to _BaseHDU() will cause its
# values to be modified in undesired ways...need to have a better way
# of doing this
tmp_hdu._header = self._header
self._header_offset = tmp_hdu._writeheader(self._ffo)[0]
self._data_offset = self._ffo.tell()
self._size = self.size
if self._size != 0:
self.writecomplete = False
else:
self.writecomplete = True
