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https://github.com/kidfromjupiter/nearby.git
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68 lines
2.4 KiB
C++
68 lines
2.4 KiB
C++
// Copyright 2023 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef THIRD_PARTY_NEARBY_CONNECTIONS_IMPLEMENTATION_MEDIUMS_BLE_INSTANT_ON_LOST_ADVERTISEMENT_H_
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#define THIRD_PARTY_NEARBY_CONNECTIONS_IMPLEMENTATION_MEDIUMS_BLE_INSTANT_ON_LOST_ADVERTISEMENT_H_
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#include <list>
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#include <string>
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#include <vector>
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#include "absl/status/statusor.h"
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#include "absl/strings/string_view.h"
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namespace nearby {
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namespace connections {
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namespace mediums {
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// Represents the format of the BLE instant on lost Advertisement used in
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// Advertising + Discovery.
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//
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// <p>[ADVERTISEMENT TYPE 4 bits][1 bit unused][VERSION 3 bits] [5 bits
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// unused][HASH COUNT 3 bits] [ADVERTISEMENT_HASH 4 Bytes]x1~6
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class InstantOnLostAdvertisement {
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public:
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// The BLE advertisement available size is 27 - 3 (BT header) - 2 (Our Header)
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// = 22 bytes so we can put at most 5 hashes in one advertisement.
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static constexpr int kMaxHashCount = 5;
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// Creates an on lost advertisement from an advertisement hash.
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static absl::StatusOr<InstantOnLostAdvertisement> CreateFromHashes(
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const std::list<std::string>& hashes);
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// Creates an InstantOnLostAdvertisement from raw bytes received over-the-air.
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static absl::StatusOr<InstantOnLostAdvertisement> CreateFromBytes(
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absl::string_view bytes);
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// Returns this instant-on-lost-advertisement in raw string
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// (non human-readable) format.
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// NOTE: Even though this function returns a string, this is not a UTF-8
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// string, as it contains raw bytes.
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std::string ToBytes() const;
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std::list<std::string> hashes() const { return hashes_; }
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private:
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explicit InstantOnLostAdvertisement(const std::list<std::string>& hashes)
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: hashes_(hashes) {}
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std::list<std::string> hashes_;
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};
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} // namespace mediums
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} // namespace connections
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_CONNECTIONS_IMPLEMENTATION_MEDIUMS_BLE_INSTANT_ON_LOST_ADVERTISEMENT_H_
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