def DecodeField(buffer, pos, end, message, field_dict):
"""Decode serialized repeated enum to its value and a new position.
Args:
buffer: memoryview of the serialized bytes.
pos: int, position in the memory view to start at.
end: int, end position of serialized data
message: Message object to store unknown fields in
field_dict: Map[Descriptor, Any] to store decoded values in.
Returns:
int, new position in serialized data.
"""
value_start_pos = pos
(enum_value, pos) = _DecodeSignedVarint32(buffer, pos)
if pos > end:
raise _DecodeError('Truncated message.')
# pylint: disable=protected-access
if enum_value in enum_type.values_by_number:
field_dict[key] = enum_value
else:
if not message._unknown_fields:
message._unknown_fields = []
tag_bytes = encoder.TagBytes(field_number,
wire_format.WIRETYPE_VARINT)
message._unknown_fields.append(
(tag_bytes, buffer[value_start_pos:pos].tobytes()))
if message._unknown_field_set is None:
message._unknown_field_set = containers.UnknownFieldSet()
message._unknown_field_set._add(field_number,
wire_format.WIRETYPE_VARINT,
enum_value)
# pylint: enable=protected-access
return pos
def DecodePackedField(buffer, pos, end, message, field_dict):
"""Decode serialized packed enum to its value and a new position.
Args:
buffer: memoryview of the serialized bytes.
pos: int, position in the memory view to start at.
end: int, end position of serialized data
message: Message object to store unknown fields in
field_dict: Map[Descriptor, Any] to store decoded values in.
Returns:
int, new position in serialized data.
"""
value = field_dict.get(key)
if value is None:
value = field_dict.setdefault(key, new_default(message))
(endpoint, pos) = local_DecodeVarint(buffer, pos)
endpoint += pos
if endpoint > end:
raise _DecodeError('Truncated message.')
while pos < endpoint:
value_start_pos = pos
(element, pos) = _DecodeSignedVarint32(buffer, pos)
# pylint: disable=protected-access
if element in enum_type.values_by_number:
value.append(element)
else:
if not message._unknown_fields:
message._unknown_fields = []
tag_bytes = encoder.TagBytes(field_number,
wire_format.WIRETYPE_VARINT)
message._unknown_fields.append(
(tag_bytes, buffer[value_start_pos:pos].tobytes()))
if message._unknown_field_set is None:
message._unknown_field_set = containers.UnknownFieldSet(
)
message._unknown_field_set._add(
field_number, wire_format.WIRETYPE_VARINT, element)
# pylint: enable=protected-access
if pos > endpoint:
if element in enum_type.values_by_number:
del value[-1] # Discard corrupt value.
else:
del message._unknown_fields[-1]
# pylint: disable=protected-access
del message._unknown_field_set._values[-1]
# pylint: enable=protected-access
raise _DecodeError('Packed element was truncated.')
return pos
def _DecodeUnknownFieldSet(buffer, pos, end_pos=None):
"""Decode UnknownFieldSet. Returns the UnknownFieldSet and new position."""
unknown_field_set = containers.UnknownFieldSet()
while end_pos is None or pos < end_pos:
(tag_bytes, pos) = ReadTag(buffer, pos)
(tag, _) = _DecodeVarint(tag_bytes, 0)
field_number, wire_type = wire_format.UnpackTag(tag)
if wire_type == wire_format.WIRETYPE_END_GROUP:
break
(data, pos) = _DecodeUnknownField(buffer, pos, wire_type)
# pylint: disable=protected-access
unknown_field_set._add(field_number, wire_type, data)
return (unknown_field_set, pos)
def DecodeRepeatedField(buffer, pos, end, message, field_dict):
"""Decode serialized repeated enum to its value and a new position.
Args:
buffer: memoryview of the serialized bytes.
pos: int, position in the memory view to start at.
end: int, end position of serialized data
message: Message object to store unknown fields in
field_dict: Map[Descriptor, Any] to store decoded values in.
Returns:
int, new position in serialized data.
"""
value = field_dict.get(key)
if value is None:
value = field_dict.setdefault(key, new_default(message))
while 1:
(element, new_pos) = _DecodeSignedVarint32(buffer, pos)
# pylint: disable=protected-access
if element in enum_type.values_by_number:
value.append(element)
else:
if not message._unknown_fields:
message._unknown_fields = []
message._unknown_fields.append(
(tag_bytes, buffer[pos:new_pos].tobytes()))
if message._unknown_field_set is None:
message._unknown_field_set = containers.UnknownFieldSet(
)
message._unknown_field_set._add(
field_number, wire_format.WIRETYPE_VARINT, element)
# pylint: enable=protected-access
# Predict that the next tag is another copy of the same repeated
# field.
pos = new_pos + tag_len
if buffer[new_pos:pos] != tag_bytes or new_pos >= end:
# Prediction failed. Return.
if new_pos > end:
raise _DecodeError('Truncated message.')
return new_pos
def DecodeItem(buffer, pos, end, message, field_dict):
"""Decode serialized message set to its value and new position.
Args:
buffer: memoryview of the serialized bytes.
pos: int, position in the memory view to start at.
end: int, end position of serialized data
message: Message object to store unknown fields in
field_dict: Map[Descriptor, Any] to store decoded values in.
Returns:
int, new position in serialized data.
"""
message_set_item_start = pos
type_id = -1
message_start = -1
message_end = -1
# Technically, type_id and message can appear in any order, so we need
# a little loop here.
while 1:
(tag_bytes, pos) = local_ReadTag(buffer, pos)
if tag_bytes == type_id_tag_bytes:
(type_id, pos) = local_DecodeVarint(buffer, pos)
elif tag_bytes == message_tag_bytes:
(size, message_start) = local_DecodeVarint(buffer, pos)
pos = message_end = message_start + size
elif tag_bytes == item_end_tag_bytes:
break
else:
pos = SkipField(buffer, pos, end, tag_bytes)
if pos == -1:
raise _DecodeError('Missing group end tag.')
if pos > end:
raise _DecodeError('Truncated message.')
if type_id == -1:
raise _DecodeError('MessageSet item missing type_id.')
if message_start == -1:
raise _DecodeError('MessageSet item missing message.')
extension = message.Extensions._FindExtensionByNumber(type_id)
# pylint: disable=protected-access
if extension is not None:
value = field_dict.get(extension)
if value is None:
message_type = extension.message_type
if not hasattr(message_type, '_concrete_class'):
# pylint: disable=protected-access
message._FACTORY.GetPrototype(message_type)
value = field_dict.setdefault(extension,
message_type._concrete_class())
if value._InternalParse(buffer, message_start,
message_end) != message_end:
# The only reason _InternalParse would return early is if it encountered
# an end-group tag.
raise _DecodeError('Unexpected end-group tag.')
else:
if not message._unknown_fields:
message._unknown_fields = []
message._unknown_fields.append(
(MESSAGE_SET_ITEM_TAG,
buffer[message_set_item_start:pos].tobytes()))
if message._unknown_field_set is None:
message._unknown_field_set = containers.UnknownFieldSet()
message._unknown_field_set._add(
type_id, wire_format.WIRETYPE_LENGTH_DELIMITED,
buffer[message_start:message_end].tobytes())
# pylint: enable=protected-access
return pos
