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class LineBuffer(object):
"""
Allows to accumulate data, and than iterate over it getting tokens
split by line breaks '\n'. If at the end there is no line break,
the data will sit in the line buffer until more data with line
break comes in.
"""
def __init__(self):
self.buf = ""
def append(self, data):
self.buf += data
def __iter__(self):
return self
def __next__(self):
pos = self.buf.find("\n")
if pos != -1:
result = self.buf[0:pos]
self.buf = self.buf[pos + 1 :]
return result
raise StopIteration
def clean(self):
self.buf = ""
class SizeBuffer:
def __init__(self, size_len=2):
self._buf = b""
self._size_len = size_len
def append(self, data):
self._buf += data
def __iter__(self):
return self
def __next__(self):
if not self._buf:
raise StopIteration
size = int.from_bytes(self._buf[: self._size_len], "big")
if len(self._buf[self._size_len :]) >= size:
data = self._buf[self._size_len : self._size_len + size]
self._buf = self._buf[self._size_len + size :]
return data
raise StopIteration