The entries are used to synchronize the state of services instances and the Publish/-Subscribe handling.
This page hosts a formal specification of AUTOSAR SOME/IP Service Discovery Entries using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Python generated by Kaitai Struct depends on the Python runtime library. You have to install it before you can parse data.
The Python runtime library can be installed from PyPI:
python3 -m pip install kaitaistructParse a local file and get structure in memory:
data = SomeIpSdEntries.from_file("path/to/local/file.bin")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = SomeIpSdEntries(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.entries # => get entries
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
# type: ignore
import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
from enum import IntEnum
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 11):
raise Exception("Incompatible Kaitai Struct Python API: 0.11 or later is required, but you have %s" % (kaitaistruct.__version__))
class SomeIpSdEntries(KaitaiStruct):
"""The entries are used to synchronize the state of services instances and the
Publish/-Subscribe handling.
.. seealso::
section 4.1.2.3 Entry Format - https://www.autosar.org/fileadmin/standards/foundation/19-11/AUTOSAR_PRS_SOMEIPServiceDiscoveryProtocol.pdf
-
"""
def __init__(self, _io, _parent=None, _root=None):
super(SomeIpSdEntries, self).__init__(_io)
self._parent = _parent
self._root = _root or self
self._read()
def _read(self):
self.entries = []
i = 0
while not self._io.is_eof():
self.entries.append(SomeIpSdEntries.SdEntry(self._io, self, self._root))
i += 1
def _fetch_instances(self):
pass
for i in range(len(self.entries)):
pass
self.entries[i]._fetch_instances()
class SdEntry(KaitaiStruct):
class EntryTypes(IntEnum):
find = 0
offer = 1
subscribe = 6
subscribe_ack = 7
def __init__(self, _io, _parent=None, _root=None):
super(SomeIpSdEntries.SdEntry, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.header = SomeIpSdEntries.SdEntry.SdEntryHeader(self._io, self, self._root)
_on = self.header.type
if _on == SomeIpSdEntries.SdEntry.EntryTypes.find:
pass
self.content = SomeIpSdEntries.SdEntry.SdServiceEntry(self._io, self, self._root)
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.offer:
pass
self.content = SomeIpSdEntries.SdEntry.SdServiceEntry(self._io, self, self._root)
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.subscribe:
pass
self.content = SomeIpSdEntries.SdEntry.SdEventgroupEntry(self._io, self, self._root)
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.subscribe_ack:
pass
self.content = SomeIpSdEntries.SdEntry.SdEventgroupEntry(self._io, self, self._root)
def _fetch_instances(self):
pass
self.header._fetch_instances()
_on = self.header.type
if _on == SomeIpSdEntries.SdEntry.EntryTypes.find:
pass
self.content._fetch_instances()
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.offer:
pass
self.content._fetch_instances()
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.subscribe:
pass
self.content._fetch_instances()
elif _on == SomeIpSdEntries.SdEntry.EntryTypes.subscribe_ack:
pass
self.content._fetch_instances()
class SdEntryHeader(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(SomeIpSdEntries.SdEntry.SdEntryHeader, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.type = KaitaiStream.resolve_enum(SomeIpSdEntries.SdEntry.EntryTypes, self._io.read_u1())
self.index_first_options = self._io.read_u1()
self.index_second_options = self._io.read_u1()
self.number_first_options = self._io.read_bits_int_be(4)
self.number_second_options = self._io.read_bits_int_be(4)
self.service_id = self._io.read_u2be()
self.instance_id = self._io.read_u2be()
self.major_version = self._io.read_u1()
self.ttl = self._io.read_bits_int_be(24)
def _fetch_instances(self):
pass
class SdEventgroupEntry(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(SomeIpSdEntries.SdEntry.SdEventgroupEntry, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.reserved = self._io.read_u1()
self.initial_data_requested = self._io.read_bits_int_be(1) != 0
self.reserved2 = self._io.read_bits_int_be(3)
self.counter = self._io.read_bits_int_be(4)
self.event_group_id = self._io.read_u2be()
def _fetch_instances(self):
pass
class SdServiceEntry(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
super(SomeIpSdEntries.SdEntry.SdServiceEntry, self).__init__(_io)
self._parent = _parent
self._root = _root
self._read()
def _read(self):
self.minor_version = self._io.read_u4be()
def _fetch_instances(self):
pass