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