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105 lines
3.3 KiB
105 lines
3.3 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 <dlfcn.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <utils/Log.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 { |
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return packet_; |
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} |
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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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ssize_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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if (bytes_read <= 0) { |
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LOG_ALWAYS_FATAL_IF((bytes_read == 0), |
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"%s: Unexpected EOF reading the header!", __func__); |
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LOG_ALWAYS_FATAL("%s: Read header error: %s", __func__, |
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strerror(errno)); |
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} |
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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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ssize_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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if (bytes_read <= 0) { |
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LOG_ALWAYS_FATAL_IF((bytes_read == 0), |
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"%s: Unexpected EOF reading the payload!", |
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__func__); |
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LOG_ALWAYS_FATAL("%s: Read payload error: %s", __func__, |
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strerror(errno)); |
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} |
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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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