mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
Alexey Polyudov
204f76077d
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec
101 lines
3.4 KiB
C++
101 lines
3.4 KiB
C++
#ifndef CORE_INTERNAL_MEDIUMS_BLE_ADVERTISEMENT_H_
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#define CORE_INTERNAL_MEDIUMS_BLE_ADVERTISEMENT_H_
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#include "platform/byte_array.h"
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#include "platform/ptr.h"
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namespace location {
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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 Mediums BLE Advertisement used in advertising
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// and discovery.
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//
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// [VERSION][SOCKET_VERSION][2_RESERVED_BITS][SERVICE_ID_HASH][DATA_SIZE][DATA]
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//
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// See go/nearby-ble-design for more information.
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class BLEAdvertisement {
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public:
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// Versions of the BLEAdvertisement.
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struct Version {
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enum Value {
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UNKNOWN = 0,
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V1 = 1,
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V2 = 2,
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// Version is only allocated 3 bits in the BLEAdvertisement, so this can
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// never go beyond V7.
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};
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};
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// Versions of the BLESocket.
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struct SocketVersion {
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enum Value {
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UNKNOWN = 0,
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V1 = 1,
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V2 = 2,
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// SocketVersion is only allocated 3 bits in the BLEAdvertisement, so this
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// can never go beyond V7.
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};
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};
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static ConstPtr<BLEAdvertisement> fromBytes(
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ConstPtr<ByteArray> ble_advertisement_bytes);
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static ConstPtr<ByteArray> toBytes(Version::Value version,
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SocketVersion::Value socket_version,
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ConstPtr<ByteArray> service_id_hash,
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ConstPtr<ByteArray> data);
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static const std::uint32_t kServiceIdHashLength;
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~BLEAdvertisement();
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Version::Value getVersion() const;
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SocketVersion::Value getSocketVersion() const;
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ConstPtr<ByteArray> getServiceIdHash() const;
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ConstPtr<ByteArray> getData() const;
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// Operator overloads when comparing ConstPtr<BLEAdvertisement>.
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bool operator==(const BLEAdvertisement &rhs) const;
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bool operator<(const BLEAdvertisement &rhs) const;
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private:
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static bool isSupportedVersion(Version::Value version);
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static bool isSupportedSocketVersion(SocketVersion::Value socket_version);
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static Version::Value parseVersionFromByte(std::uint16_t byte);
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static SocketVersion::Value parseSocketVersionFromByte(std::uint16_t byte);
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static size_t deserializeDataSize(const char *data_size_bytes_read_ptr);
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static size_t computeDataSize(ConstPtr<ByteArray> ble_advertisement_bytes);
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static size_t computeAdvertisementLength(ConstPtr<ByteArray> data);
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static void serializeVersionByte(char *version_byte_write_ptr,
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Version::Value version);
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static void serializeSocketVersionByte(char *socket_version_byte_write_ptr,
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SocketVersion::Value socket_version);
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static void serializeDataSize(char *data_size_bytes_write_ptr,
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size_t data_size);
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static const std::uint32_t kVersionLength;
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static const std::uint32_t kDataSizeLength;
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static const std::uint32_t kMinAdvertisementLength;
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static const std::uint32_t kMaxDataSize;
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static const std::uint16_t kVersionBitmask;
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static const std::uint16_t kSocketVersionBitmask;
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BLEAdvertisement(Version::Value version, SocketVersion::Value socket_version,
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ConstPtr<ByteArray> service_id_hash,
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ConstPtr<ByteArray> data);
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const Version::Value version_;
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const SocketVersion::Value socket_version_;
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ScopedPtr<ConstPtr<ByteArray> > service_id_hash_;
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ScopedPtr<ConstPtr<ByteArray> > data_;
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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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} // namespace location
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#endif // CORE_INTERNAL_MEDIUMS_BLE_ADVERTISEMENT_H_
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