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[EDIT] FILE: unknown_fields.py

# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# https://developers.google.com/protocol-buffers/
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#
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"""Contains Unknown Fields APIs.

Simple usage example:
  unknown_field_set = UnknownFieldSet(message)
  for unknown_field in unknown_field_set:
    wire_type = unknown_field.wire_type
    field_number = unknown_field.field_number
    data = unknown_field.data
"""

from google.protobuf.internal import api_implementation

if api_implementation._c_module is not None:  # pylint: disable=protected-access
  UnknownFieldSet = api_implementation._c_module.UnknownFieldSet  # pylint: disable=protected-access
else:
  from google.protobuf.internal import decoder  # pylint: disable=g-import-not-at-top
  from google.protobuf.internal import wire_format  # pylint: disable=g-import-not-at-top

class UnknownField:
    """A parsed unknown field."""

# Disallows assignment to other attributes.
    __slots__ = ['_field_number', '_wire_type', '_data']

def __init__(self, field_number, wire_type, data):
      self._field_number = field_number
      self._wire_type = wire_type
      self._data = data
      return

@property
    def field_number(self):
      return self._field_number

@property
    def wire_type(self):
      return self._wire_type

@property
    def data(self):
      return self._data

class UnknownFieldSet:
    """UnknownField container."""

# Disallows assignment to other attributes.
    __slots__ = ['_values']

def __init__(self, msg):

def InternalAdd(field_number, wire_type, data):
        unknown_field = UnknownField(field_number, wire_type, data)
        self._values.append(unknown_field)

self._values = []
      msg_des = msg.DESCRIPTOR
      # pylint: disable=protected-access
      unknown_fields = msg._unknown_fields
      if (msg_des.has_options and
          msg_des.GetOptions().message_set_wire_format):
        local_decoder = decoder.UnknownMessageSetItemDecoder()
        for _, buffer in unknown_fields:
          (field_number, data) = local_decoder(memoryview(buffer))
          InternalAdd(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED, data)
      else:
        for tag_bytes, buffer in unknown_fields:
          # pylint: disable=protected-access
          (tag, _) = decoder._DecodeVarint(tag_bytes, 0)
          field_number, wire_type = wire_format.UnpackTag(tag)
          if field_number == 0:
            raise RuntimeError('Field number 0 is illegal.')
          (data, _) = decoder._DecodeUnknownField(
              memoryview(buffer), 0, wire_type)
          InternalAdd(field_number, wire_type, data)

def __getitem__(self, index):
      size = len(self._values)
      if index < 0:
        index += size
      if index < 0 or index >= size:
        raise IndexError('index %d out of range'.index)

return self._values[index]

def __len__(self):
      return len(self._values)

def __iter__(self):
      return iter(self._values)

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