def get_message(self, key):
"""Return a Message representation or raise a KeyError."""
start, stop = self._lookup(key)
self._file.seek(start)
self._file.readline() # Skip b'1,' line specifying labels.
original_headers = io.BytesIO()
while True:
line = self._file.readline()
if line == b'*** EOOH ***' + linesep or not line:
break
original_headers.write(line.replace(linesep, b'\n'))
visible_headers = io.BytesIO()
while True:
line = self._file.readline()
if line == linesep or not line:
break
visible_headers.write(line.replace(linesep, b'\n'))
# Read up to the stop, or to the end
n = stop - self._file.tell()
assert n >= 0
body = self._file.read(n)
body = body.replace(linesep, b'\n')
msg = BabylMessage(original_headers.getvalue() + body)
msg.set_visible(visible_headers.getvalue())
if key in self._labels:
msg.set_labels(self._labels[key])
return msg
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