1 // Copyright 2023 The Pigweed Authors 2 // 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 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 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 13 // the License. 14 15 #pragma once 16 #include <cstddef> 17 18 #include "pw_bluetooth_sapphire/internal/host/common/byte_buffer.h" 19 #include "pw_bluetooth_sapphire/internal/host/l2cap/l2cap_defs.h" 20 21 namespace bt::l2cap { 22 23 // Computes the Frame Check Sequence (FCS) over the bytes in |view| per Core 24 // Spec v5.0, Vol 3, Part A, Section 3.3.5. |initial_value| may be 25 // kInitialFcsValue to begin a new FCS computation or the result of FCS 26 // computation over a contiguous sequence immediately preceding |view|. If 27 // |view| has length zero, returns |initial_value|. 28 [[nodiscard]] FrameCheckSequence ComputeFcs( 29 BufferView view, FrameCheckSequence initial_value = kInitialFcsValue); 30 31 } // namespace bt::l2cap 32