| # Copyright 2021 The Pigweed Authors |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| # use this file except in compliance with the License. You may obtain a copy of |
| # the License at |
| # |
| # https://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| # License for the specific language governing permissions and limitations under |
| # the License. |
| """Tools for working with tokenized logs.""" |
| |
| from dataclasses import dataclass |
| |
| |
| def _mask(value: int, start: int, count: int) -> int: |
| mask = (1 << count) - 1 |
| return (value & (mask << start)) >> start |
| |
| |
| @dataclass(frozen=True) |
| class Metadata: |
| """Parses the metadata payload sent by pw_log_tokenized.""" |
| _value: int |
| |
| log_bits: int = 6 |
| module_bits: int = 16 |
| flag_bits: int = 10 |
| |
| def log_level(self) -> int: |
| return _mask(self._value, 0, self.log_bits) |
| |
| def module_token(self) -> int: |
| return _mask(self._value, self.log_bits, self.module_bits) |
| |
| def flags(self) -> int: |
| return _mask(self._value, self.log_bits + self.module_bits, |
| self.flag_bits) |