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# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
from pkg_resources import parse_version
from .kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO
import collections
if parse_version(ks_version) < parse_version('0.7'):
raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))
class TcpSegment(KaitaiStruct):
"""TCP is one of the core Internet protocols on transport layer (AKA
OSI layer 4), providing stateful connections with error checking,
guarantees of delivery, order of segments and avoidance of duplicate
delivery.
"""
SEQ_FIELDS = ["src_port", "dst_port", "seq_num", "ack_num", "b12", "b13", "window_size", "checksum", "urgent_pointer", "body"]
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._debug = collections.defaultdict(dict)
def _read(self):
self._debug['src_port']['start'] = self._io.pos()
self.src_port = self._io.read_u2be()
self._debug['src_port']['end'] = self._io.pos()
self._debug['dst_port']['start'] = self._io.pos()
self.dst_port = self._io.read_u2be()
self._debug['dst_port']['end'] = self._io.pos()
self._debug['seq_num']['start'] = self._io.pos()
self.seq_num = self._io.read_u4be()
self._debug['seq_num']['end'] = self._io.pos()
self._debug['ack_num']['start'] = self._io.pos()
self.ack_num = self._io.read_u4be()
self._debug['ack_num']['end'] = self._io.pos()
self._debug['b12']['start'] = self._io.pos()
self.b12 = self._io.read_u1()
self._debug['b12']['end'] = self._io.pos()
self._debug['b13']['start'] = self._io.pos()
self.b13 = self._io.read_u1()
self._debug['b13']['end'] = self._io.pos()
self._debug['window_size']['start'] = self._io.pos()
self.window_size = self._io.read_u2be()
self._debug['window_size']['end'] = self._io.pos()
self._debug['checksum']['start'] = self._io.pos()
self.checksum = self._io.read_u2be()
self._debug['checksum']['end'] = self._io.pos()
self._debug['urgent_pointer']['start'] = self._io.pos()
self.urgent_pointer = self._io.read_u2be()
self._debug['urgent_pointer']['end'] = self._io.pos()
self._debug['body']['start'] = self._io.pos()
self.body = self._io.read_bytes_full()
self._debug['body']['end'] = self._io.pos()
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