57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# *****************************************************************************
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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# details.
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#
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# You should have received a copy of the GNU General Public License along with
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# this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Module authors:
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# Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
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#
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# *****************************************************************************
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"""Encoding/decoding Frames"""
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from secop.protocol.framing import Framer
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class EOLFramer(Framer):
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"""Text based message framer
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messages are delimited by '\r\n'
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upon reception the end of a message is detected by '\r\n','\n' or '\n\r'
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"""
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data = b''
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def encode(self, *frames):
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"""add transport layer encapsulation/framing of messages"""
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return b'%s\r\n' % b'\r\n'.join(frames)
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def decode(self, data):
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"""remove transport layer encapsulation/framing of messages
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returns a list of messageframes which got decoded from data!
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"""
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self.data += data
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res = []
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while b'\n' in self.data:
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frame, self.data = self.data.split(b'\n', 1)
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if frame.endswith('\r'):
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frame = frame[:-1]
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if self.data.startswith('\r'):
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self.data = self.data[1:]
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res.append(frame)
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return res
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def reset(self):
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self.data = b''
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