/usr/lib/python2.7/dist-packages/nibabel/fileholders.py is in python-nibabel 2.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# See COPYING file distributed along with the NiBabel package for the
# copyright and license terms.
#
### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ### ##
''' Fileholder class '''
from copy import copy
from .openers import ImageOpener
class FileHolderError(Exception):
pass
class FileHolder(object):
''' class to contain filename, fileobj and file position
'''
def __init__(self,
filename=None,
fileobj=None,
pos=0):
''' Initialize FileHolder instance
Parameters
----------
filename : str, optional
filename. Default is None
fileobj : file-like object, optional
Should implement at least 'seek' (for the purposes for this
class). Default is None
pos : int, optional
position in filename or fileobject at which to start reading
or writing data; defaults to 0
'''
self.filename = filename
self.fileobj = fileobj
self.pos = pos
def get_prepare_fileobj(self, *args, **kwargs):
''' Return fileobj if present, or return fileobj from filename
Set position to that given in self.pos
Parameters
----------
*args : tuple
positional arguments to file open. Ignored if there is a
defined ``self.fileobj``. These might include the mode, such
as 'rb'
**kwargs : dict
named arguments to file open. Ignored if there is a
defined ``self.fileobj``
Returns
-------
fileobj : file-like object
object has position set (via ``fileobj.seek()``) to
``self.pos``
'''
if self.fileobj is not None:
obj = ImageOpener(self.fileobj) # for context manager
obj.seek(self.pos)
elif self.filename is not None:
obj = ImageOpener(self.filename, *args, **kwargs)
if self.pos != 0:
obj.seek(self.pos)
else:
raise FileHolderError('No filename or fileobj present')
return obj
def same_file_as(self, other):
""" Test if `self` refers to same files / fileobj as `other`
Parameters
----------
other : object
object with `filename` and `fileobj` attributes
Returns
-------
tf : bool
True if `other` has the same filename (or both have None) and the
same fileobj (or both have None
"""
return ((self.filename == other.filename) and
(self.fileobj == other.fileobj))
@property
def file_like(self):
""" Return ``self.fileobj`` if not None, otherwise ``self.filename``
"""
return self.fileobj if self.fileobj is not None else self.filename
def copy_file_map(file_map):
''' Copy mapping of fileholders given by `file_map`
Parameters
----------
file_map : mapping
mapping of ``FileHolder`` instances
Returns
-------
fm_copy : dict
Copy of `file_map`, using shallow copy of ``FileHolder``\s
'''
fm_copy = {}
for key, fh in file_map.items():
fm_copy[key] = copy(fh)
return fm_copy
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