Update Protobuf and add protos for CS2 (#176)

* Replace protobuf 2.6.1 with 3.21.8

* Update/add protobuf libs

* Add CS2 protos

* Remove old csgo/dota protos

* Add versioned protoc bin

* Comment out Valve's `schema` define for now

* Use ENetworkDisconnectionReason

* Fix-up `offsetof` to avoid errors on some Clang versions

thirdparty/protobuf-3.21.8/python/google/protobuf/internal/api_implementation.py

@@ -0,0 +1,168 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+# https://developers.google.com/protocol-buffers/
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Determine which implementation of the protobuf API is used in this process.
+"""
+
+import importlib
+import os
+import sys
+import warnings
+
+
+def _ApiVersionToImplementationType(api_version):
+  if api_version == 2:
+    return 'cpp'
+  if api_version == 1:
+    raise ValueError('api_version=1 is no longer supported.')
+  if api_version == 0:
+    return 'python'
+  return None
+
+
+_implementation_type = None
+try:
+  # pylint: disable=g-import-not-at-top
+  from google.protobuf.internal import _api_implementation
+  # The compile-time constants in the _api_implementation module can be used to
+  # switch to a certain implementation of the Python API at build time.
+  _implementation_type = _ApiVersionToImplementationType(
+      _api_implementation.api_version)
+except ImportError:
+  pass  # Unspecified by compiler flags.
+
+
+def _CanImport(mod_name):
+  try:
+    mod = importlib.import_module(mod_name)
+    # Work around a known issue in the classic bootstrap .par import hook.
+    if not mod:
+      raise ImportError(mod_name + ' import succeeded but was None')
+    return True
+  except ImportError:
+    return False
+
+
+if _implementation_type is None:
+  if _CanImport('google._upb._message'):
+    _implementation_type = 'upb'
+  elif _CanImport('google.protobuf.pyext._message'):
+    _implementation_type = 'cpp'
+  else:
+    _implementation_type = 'python'
+
+
+# This environment variable can be used to switch to a certain implementation
+# of the Python API, overriding the compile-time constants in the
+# _api_implementation module. Right now only 'python', 'cpp' and 'upb' are
+# valid values. Any other value will raise error.
+_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION',
+                                 _implementation_type)
+
+if _implementation_type not in ('python', 'cpp', 'upb'):
+  raise ValueError('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION {0} is not '
+                   'supported. Please set to \'python\', \'cpp\' or '
+                   '\'upb\'.'.format(_implementation_type))
+
+if 'PyPy' in sys.version and _implementation_type == 'cpp':
+  warnings.warn('PyPy does not work yet with cpp protocol buffers. '
+                'Falling back to the python implementation.')
+  _implementation_type = 'python'
+
+_c_module = None
+
+if _implementation_type == 'cpp':
+  try:
+    # pylint: disable=g-import-not-at-top
+    from google.protobuf.pyext import _message
+    _c_module = _message
+    del _message
+  except ImportError:
+    # TODO(jieluo): fail back to python
+    warnings.warn(
+        'Selected implementation cpp is not available.')
+    pass
+
+if _implementation_type == 'upb':
+  try:
+    # pylint: disable=g-import-not-at-top
+    from google._upb import _message
+    _c_module = _message
+    del _message
+  except ImportError:
+    warnings.warn('Selected implementation upb is not available. '
+                  'Falling back to the python implementation.')
+    _implementation_type = 'python'
+    pass
+
+# Detect if serialization should be deterministic by default
+try:
+  # The presence of this module in a build allows the proto implementation to
+  # be upgraded merely via build deps.
+  #
+  # NOTE: Merely importing this automatically enables deterministic proto
+  # serialization for C++ code, but we still need to export it as a boolean so
+  # that we can do the same for `_implementation_type == 'python'`.
+  #
+  # NOTE2: It is possible for C++ code to enable deterministic serialization by
+  # default _without_ affecting Python code, if the C++ implementation is not in
+  # use by this module.  That is intended behavior, so we don't actually expose
+  # this boolean outside of this module.
+  #
+  # pylint: disable=g-import-not-at-top,unused-import
+  from google.protobuf import enable_deterministic_proto_serialization
+  _python_deterministic_proto_serialization = True
+except ImportError:
+  _python_deterministic_proto_serialization = False
+
+
+# Usage of this function is discouraged. Clients shouldn't care which
+# implementation of the API is in use. Note that there is no guarantee
+# that differences between APIs will be maintained.
+# Please don't use this function if possible.
+def Type():
+  return _implementation_type
+
+
+def _SetType(implementation_type):
+  """Never use! Only for protobuf benchmark."""
+  global _implementation_type
+  _implementation_type = implementation_type
+
+
+# See comment on 'Type' above.
+# TODO(jieluo): Remove the API, it returns a constant. b/228102101
+def Version():
+  return 2
+
+
+# For internal use only
+def IsPythonDefaultSerializationDeterministic():
+  return _python_deterministic_proto_serialization