def GroupDecoder(field_number, is_repeated, is_packed, key, new_default): """Returns a decoder for a group field.""" end_tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_END_GROUP) end_tag_len = len(end_tag_bytes) assert not is_packed if is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_START_GROUP) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) while 1: value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) # Read sub-message. pos = value.add()._InternalParse(buffer, pos, end) # Read end tag. new_pos = pos + end_tag_len if buffer[pos:new_pos] != end_tag_bytes or new_pos > end: raise _DecodeError('Missing group end tag.') # 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. return new_pos return DecodeRepeatedField else: def DecodeField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) # Read sub-message. pos = value._InternalParse(buffer, pos, end) # Read end tag. new_pos = pos + end_tag_len if buffer[pos:new_pos] != end_tag_bytes or new_pos > end: raise _DecodeError('Missing group end tag.') return new_pos return DecodeField
def DecodePackedField(buffer, pos, end, message, field_dict): 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) 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])) if pos > endpoint: if element in enum_type.values_by_number: del value[-1] # Discard corrupt value. else: del message._unknown_fields[-1] raise _DecodeError('Packed element was truncated.') return pos
def BytesDecoder(field_number, is_repeated, is_packed, key, new_default): """Returns a decoder for a bytes field.""" local_DecodeVarint = _DecodeVarint assert not is_packed if is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) while 1: (size, pos) = local_DecodeVarint(buffer, pos) new_pos = pos + size if new_pos > end: raise _DecodeError('Truncated string.') value.append(buffer[pos:new_pos]) # 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. return new_pos return DecodeRepeatedField else: def DecodeField(buffer, pos, end, message, field_dict): (size, pos) = local_DecodeVarint(buffer, pos) new_pos = pos + size if new_pos > end: raise _DecodeError('Truncated string.') field_dict[key] = buffer[pos:new_pos] return new_pos return DecodeField
def MessageDecoder(field_number, is_repeated, is_packed, key, new_default): """Returns a decoder for a message field.""" local_DecodeVarint = _DecodeVarint assert not is_packed if is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) while 1: value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) # Read length. (size, pos) = local_DecodeVarint(buffer, pos) new_pos = pos + size if new_pos > end: raise _DecodeError('Truncated message.') # Read sub-message. if value.add()._InternalParse(buffer, pos, new_pos) != new_pos: # The only reason _InternalParse would return early is if it # encountered an end-group tag. raise _DecodeError('Unexpected end-group tag.') # 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. return new_pos return DecodeRepeatedField else: def DecodeField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) # Read length. (size, pos) = local_DecodeVarint(buffer, pos) new_pos = pos + size if new_pos > end: raise _DecodeError('Truncated message.') # Read sub-message. if value._InternalParse(buffer, pos, new_pos) != new_pos: # The only reason _InternalParse would return early is if it encountered # an end-group tag. raise _DecodeError('Unexpected end-group tag.') return new_pos return DecodeField
def SpecificDecoder(field_number, is_repeated, is_packed, key, new_default): if is_packed: local_DecodeVarint = _DecodeVarint def DecodePackedField(buffer, pos, end, message, field_dict): 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: (element, pos) = decode_value(buffer, pos) value.append(element) if pos > endpoint: del value[-1] # Discard corrupt value. raise _DecodeError('Packed element was truncated.') return pos return DecodePackedField elif is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_type) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) while 1: (element, new_pos) = decode_value(buffer, pos) value.append(element) # 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 return DecodeRepeatedField else: def DecodeField(buffer, pos, end, message, field_dict): (field_dict[key], pos) = decode_value(buffer, pos) if pos > end: del field_dict[key] # Discard corrupt value. raise _DecodeError('Truncated message.') return pos return DecodeField
def DecodeField(buffer, pos, end, message, field_dict): value_start_pos = pos (enum_value, pos) = _DecodeSignedVarint32(buffer, pos) if pos > end: raise _DecodeError('Truncated message.') 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])) return pos
def AddDecoder(wiretype, is_packed): tag_bytes = encoder.TagBytes(field_descriptor.number, wiretype) cls._decoders_by_tag[tag_bytes] = ( type_checkers.TYPE_TO_DECODER[field_descriptor.type]( field_descriptor.number, is_repeated, is_packed, field_descriptor, field_descriptor._default_constructor))
def MessageSetItemDecoder(extensions_by_number): """Returns a decoder for a MessageSet item. The parameter is the _extensions_by_number map for the message class. The message set message looks like this: message MessageSet { repeated group Item = 1 { required int32 type_id = 2; required string message = 3; } } """ type_id_tag_bytes = encoder.TagBytes(2, wire_format.WIRETYPE_VARINT) message_tag_bytes = encoder.TagBytes(3, wire_format.WIRETYPE_LENGTH_DELIMITED) item_end_tag_bytes = encoder.TagBytes(1, wire_format.WIRETYPE_END_GROUP) local_ReadTag = ReadTag local_DecodeVarint = _DecodeVarint local_SkipField = SkipField def DecodeItem(buffer, pos, end, message, field_dict): 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 = extensions_by_number.get(type_id) if extension is not None: value = field_dict.get(extension) if value is None: value = field_dict.setdefault( extension, 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])) return pos return DecodeItem
def EnumDecoder(field_number, is_repeated, is_packed, key, new_default): enum_type = key.enum_type if is_packed: local_DecodeVarint = _DecodeVarint def DecodePackedField(buffer, pos, end, message, field_dict): 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) 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])) if pos > endpoint: if element in enum_type.values_by_number: del value[-1] # Discard corrupt value. else: del message._unknown_fields[-1] raise _DecodeError('Packed element was truncated.') return pos return DecodePackedField elif is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_VARINT) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): 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) 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])) # 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 return DecodeRepeatedField else: def DecodeField(buffer, pos, end, message, field_dict): value_start_pos = pos (enum_value, pos) = _DecodeSignedVarint32(buffer, pos) if pos > end: raise _DecodeError('Truncated message.') 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])) return pos return DecodeField
"""Returns a decoder for a string field.""" local_DecodeVarint = _DecodeVarint local_unicode = unicode def _ConvertToUnicode(byte_str): try: return local_unicode(byte_str, 'utf-8') except UnicodeDecodeError, e: # add more information to the error message and re-raise it. e.reason = '%s in field: %s' % (e, key.full_name) raise assert not is_packed if is_repeated: tag_bytes = encoder.TagBytes(field_number, wire_format.WIRETYPE_LENGTH_DELIMITED) tag_len = len(tag_bytes) def DecodeRepeatedField(buffer, pos, end, message, field_dict): value = field_dict.get(key) if value is None: value = field_dict.setdefault(key, new_default(message)) while 1: (size, pos) = local_DecodeVarint(buffer, pos) new_pos = pos + size if new_pos > end: raise _DecodeError('Truncated string.') value.append(_ConvertToUnicode(buffer[pos:new_pos])) # 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: