def get_bytes(self, key):
"""Return a string 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'))
while True:
line = self._file.readline()
if line == linesep or not line:
break
headers = original_headers.getvalue()
n = stop - self._file.tell()
assert n >= 0
data = self._file.read(n)
data = data.replace(linesep, b'\n')
return headers + data
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