Source code for spinnman.messages.sdp.sdp_message

# Copyright (c) 2017-2019 The University of Manchester
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from .sdp_header import SDPHeader


[docs]class SDPMessage(object): """ Wraps up an SDP message with a header and optional data. """ __slots__ = [ "_data", "_offset", "_sdp_header"] def __init__(self, sdp_header, data=None, offset=0): """ :param SDPHeader sdp_header: The header of the message :param data: The data of the SDP packet, or None if no data :type data: bytes or bytearray or None :param int offset: The offset where the valid data starts """ self._sdp_header = sdp_header self._data = data self._offset = offset @property def bytestring(self): """ The bytestring of the message :rtype: bytes """ if self._data is not None: return self._sdp_header.bytestring + self._data[self._offset:] return self._sdp_header.bytestring
[docs] @staticmethod def from_bytestring(data, offset): """ :param bytes data: :param int offset: :rtype: SDPMessage """ sdp_header = SDPHeader.from_bytestring(data, offset) return SDPMessage(sdp_header, data, offset + 8)
@property def sdp_header(self): """ The header of the packet :rtype: SDPHeader """ return self._sdp_header @property def data(self): """ The data in the packet :rtype: bytes or bytearray or None """ return self._data @property def offset(self): """ The offset where the valid data starts :rtype: int """ return self._offset