1 // Copyright 2020 The Pigweed Authors
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
18 namespace pw::hdlc_lite {
20 inline constexpr std::byte kFlag = std::byte{0x7E};
21 inline constexpr std::byte kEscape = std::byte{0x7D};
23 inline constexpr std::array<std::byte, 2> kEscapedFlag = {kEscape,
25 inline constexpr std::array<std::byte, 2> kEscapedEscape = {kEscape,
28 constexpr bool NeedsEscaping(std::byte b) {
29 return (b == kFlag || b == kEscape);
32 } // namespace pw::hdlc_lite