/usr/lib/python2.7/dist-packages/nibabel/fileutils.py is in python-nibabel 2.2.1-1.
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#
# See COPYING file distributed along with the NiBabel package for the
# copyright and license terms.
#
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""" Utilities for reading and writing to binary file formats
"""
def read_zt_byte_strings(fobj, n_strings=1, bufsize=1024):
"""Read zero-terminated byte strings from a file object `fobj`
Returns byte strings with terminal zero stripped.
Found strings can be of any length.
The file position of `fobj` on exit will be at the byte after the terminal
0 of the final read byte string.
Parameters
----------
f : fileobj
File object to use. Should implement ``read``, returning byte objects
(str in Python 2), and ``seek(n, 1)`` to seek from current file
position.
n_strings : int, optional
Number of byte strings to return
bufsize: int, optional
Define chunk size to load from file while searching for zero terminals.
We load this many bytes at a time from the file, but the returned
strings can be longer than `bufsize`.
Returns
-------
byte_strings : list
List of byte strings, where strings do not include the terminal 0
"""
byte_strings = []
trailing = b''
while True:
buf = fobj.read(bufsize)
eof = len(buf) < bufsize # end of file
zt_strings = buf.split(b'\x00')
if len(zt_strings) > 1: # At least one 0
byte_strings += [trailing + zt_strings[0]] + zt_strings[1:-1]
trailing = zt_strings[-1]
else: # No 0
trailing += zt_strings[0]
n_found = len(byte_strings)
if eof or n_found >= n_strings:
break
if n_found < n_strings:
raise ValueError('Expected {0} strings, found {1}'.format(
n_strings, n_found))
n_extra = n_found - n_strings
leftover_strings = byte_strings[n_strings:] + [trailing]
# Add number of extra strings to account for lost terminal 0s
extra_bytes = sum(len(bs) for bs in leftover_strings) + n_extra
fobj.seek(-extra_bytes, 1) # seek back from current position
return byte_strings[:n_strings]
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