| // |
| // Copyright 2017 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 "hci_packetizer.h" |
| |
| #define LOG_TAG "android.hardware.bluetooth.hci_packetizer" |
| #include <android-base/logging.h> |
| #include <utils/Log.h> |
| |
| #include <dlfcn.h> |
| #include <fcntl.h> |
| |
| namespace { |
| |
| const size_t preamble_size_for_type[] = { |
| 0, HCI_COMMAND_PREAMBLE_SIZE, HCI_ACL_PREAMBLE_SIZE, HCI_SCO_PREAMBLE_SIZE, |
| HCI_EVENT_PREAMBLE_SIZE}; |
| const size_t packet_length_offset_for_type[] = { |
| 0, HCI_LENGTH_OFFSET_CMD, HCI_LENGTH_OFFSET_ACL, HCI_LENGTH_OFFSET_SCO, |
| HCI_LENGTH_OFFSET_EVT}; |
| |
| size_t HciGetPacketLengthForType(HciPacketType type, const uint8_t* preamble) { |
| size_t offset = packet_length_offset_for_type[type]; |
| if (type != HCI_PACKET_TYPE_ACL_DATA) return preamble[offset]; |
| return (((preamble[offset + 1]) << 8) | preamble[offset]); |
| } |
| |
| } // namespace |
| |
| namespace android { |
| namespace hardware { |
| namespace bluetooth { |
| namespace hci { |
| |
| const hidl_vec<uint8_t>& HciPacketizer::GetPacket() const { return packet_; } |
| |
| void HciPacketizer::OnDataReady(int fd, HciPacketType packet_type) { |
| switch (state_) { |
| case HCI_PREAMBLE: { |
| size_t bytes_read = TEMP_FAILURE_RETRY( |
| read(fd, preamble_ + bytes_read_, |
| preamble_size_for_type[packet_type] - bytes_read_)); |
| CHECK(bytes_read > 0); |
| bytes_read_ += bytes_read; |
| if (bytes_read_ == preamble_size_for_type[packet_type]) { |
| size_t packet_length = |
| HciGetPacketLengthForType(packet_type, preamble_); |
| packet_.resize(preamble_size_for_type[packet_type] + packet_length); |
| memcpy(packet_.data(), preamble_, preamble_size_for_type[packet_type]); |
| bytes_remaining_ = packet_length; |
| state_ = HCI_PAYLOAD; |
| bytes_read_ = 0; |
| } |
| break; |
| } |
| |
| case HCI_PAYLOAD: { |
| size_t bytes_read = TEMP_FAILURE_RETRY(read( |
| fd, |
| packet_.data() + preamble_size_for_type[packet_type] + bytes_read_, |
| bytes_remaining_)); |
| CHECK(bytes_read > 0); |
| bytes_remaining_ -= bytes_read; |
| bytes_read_ += bytes_read; |
| if (bytes_remaining_ == 0) { |
| packet_ready_cb_(); |
| state_ = HCI_PREAMBLE; |
| bytes_read_ = 0; |
| } |
| break; |
| } |
| } |
| } |
| |
| } // namespace hci |
| } // namespace bluetooth |
| } // namespace hardware |
| } // namespace android |