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119 lines
4.4 KiB
119 lines
4.4 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 <fcntl.h>
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#include <log/log.h>
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namespace {
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const size_t header_size_for_type[] = {0,
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HCI_COMMAND_PREAMBLE_SIZE,
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HCI_ACL_PREAMBLE_SIZE,
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HCI_SCO_PREAMBLE_SIZE,
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HCI_EVENT_PREAMBLE_SIZE,
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HCI_ISO_PREAMBLE_SIZE};
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const size_t packet_length_offset_for_type[] = {0,
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HCI_LENGTH_OFFSET_CMD,
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HCI_LENGTH_OFFSET_ACL,
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HCI_LENGTH_OFFSET_SCO,
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HCI_LENGTH_OFFSET_EVT,
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HCI_LENGTH_OFFSET_ISO};
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size_t HciGetPacketLengthForType(HciPacketType type,
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const std::vector<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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size_t HciPacketizer::fill_header(HciPacketType packet_type,
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const std::vector<uint8_t>& buffer,
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size_t offset) {
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size_t header_size = header_size_for_type[static_cast<size_t>(packet_type)];
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if (bytes_remaining_ == 0) {
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bytes_remaining_ = header_size;
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packet_buffer_.clear();
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}
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// Add as much of the header as is available to the packet.
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size_t bytes_to_copy = std::min(bytes_remaining_, buffer.size() - offset);
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packet_buffer_.insert(packet_buffer_.end(), buffer.begin() + offset,
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buffer.begin() + offset + bytes_to_copy);
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bytes_remaining_ -= bytes_to_copy;
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// If the header is complete, find the payload size and transition.
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if (bytes_remaining_ == 0) {
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bytes_remaining_ = HciGetPacketLengthForType(packet_type, packet_buffer_);
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// If there are no bytes remaining, this is a completed packet.
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if (bytes_remaining_ > 0) {
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state_ = HCI_PAYLOAD;
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}
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}
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return bytes_to_copy;
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}
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void HciPacketizer::fill_payload(const std::vector<uint8_t>& buffer,
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size_t offset) {
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// Add as much of the payload as is available to the end of the packet.
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size_t bytes_to_copy = std::min(bytes_remaining_, buffer.size() - offset);
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packet_buffer_.insert(packet_buffer_.end(), buffer.begin() + offset,
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buffer.begin() + offset + bytes_to_copy);
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bytes_remaining_ -= bytes_to_copy;
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// If there are no bytes remaining, this is a completed packet.
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if (bytes_remaining_ == 0) {
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state_ = HCI_HEADER;
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}
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}
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bool HciPacketizer::OnDataReady(HciPacketType packet_type,
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const std::vector<uint8_t>& buffer,
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size_t offset) {
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// Start with the header.
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size_t header_bytes = 0;
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if (state_ == HCI_HEADER) {
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header_bytes = fill_header(packet_type, buffer, offset);
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}
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// If there are bytes left in this packet, fill the payload.
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if (state_ == HCI_PAYLOAD && bytes_remaining_ > 0) {
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if (offset + header_bytes < buffer.size()) {
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fill_payload(buffer, offset + header_bytes);
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}
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}
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// If there are no bytes remaining, this is a completed packet.
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if (bytes_remaining_ == 0) {
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packet_.setToExternal(packet_buffer_.data(), packet_buffer_.size());
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}
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return bytes_remaining_ == 0;
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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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