vendor_libs/test_vendor_lib/model/devices/link_layer_socket_device.cc

/*
 * Copyright 2018 The Android Open Source Project
 *
 * 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
 *
 *      http://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.
 */

#include "link_layer_socket_device.h"

#include <unistd.h>

#include "packet/packet_view.h"
#include "packet/raw_builder.h"
#include "packet/view.h"

using std::vector;

namespace test_vendor_lib {

LinkLayerSocketDevice::LinkLayerSocketDevice(int socket_fd, Phy::Type phy_type)
    : socket_(socket_fd), phy_type_(phy_type) {}

void LinkLayerSocketDevice::TimerTick() {
  if (bytes_left_ == 0) {
    auto packet_size = std::make_shared<std::vector<uint8_t>>(kSizeBytes);

    size_t bytes_received = socket_.TryReceive(kSizeBytes, packet_size->data());
    if (bytes_received == 0) {
      return;
    }
    ASSERT_LOG(bytes_received == kSizeBytes, "bytes_received == %d", static_cast<int>(bytes_received));
    bluetooth::packet::PacketView<bluetooth::packet::kLittleEndian> size(
        {bluetooth::packet::View(packet_size, 0, kSizeBytes)});
    bytes_left_ = size.begin().extract<uint32_t>();
    received_ = std::make_shared<std::vector<uint8_t>>(bytes_left_);
    offset_ = 0;
  }
  size_t bytes_received = socket_.TryReceive(bytes_left_, received_->data() + offset_);
  if (bytes_received == 0) {
    return;
  }
  bytes_left_ -= bytes_received;
  offset_ += bytes_received;
  if (bytes_left_ == 0) {
    bluetooth::packet::PacketView<bluetooth::packet::kLittleEndian> packet_view(
        received_);
    auto packet = model::packets::LinkLayerPacketView::Create(packet_view);
    ASSERT(packet.IsValid());
    SendLinkLayerPacket(packet, phy_type_);
    offset_ = 0;
    received_.reset();
  }
}

void LinkLayerSocketDevice::IncomingPacket(
    model::packets::LinkLayerPacketView packet) {
  auto size_packet = bluetooth::packet::RawBuilder();
  size_packet.AddOctets4(packet.size());
  std::vector<uint8_t> size_bytes;
  bluetooth::packet::BitInserter bit_inserter(size_bytes);
  size_packet.Serialize(bit_inserter);

  if (socket_.TrySend(size_bytes) == kSizeBytes) {
    std::vector<uint8_t> payload_bytes{packet.begin(), packet.end()};
    socket_.TrySend(payload_bytes);
  }
}

}  // namespace test_vendor_lib