| // Copyright 2017 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "advertising_report_parser.h" |
| |
| #include <zircon/assert.h> |
| |
| #include "control_packets.h" |
| |
| namespace bt { |
| namespace hci { |
| |
| AdvertisingReportParser::AdvertisingReportParser(const EventPacket& event) |
| : encountered_error_(false) { |
| ZX_DEBUG_ASSERT(event.event_code() == kLEMetaEventCode); |
| const auto& params = event.view().payload<LEMetaEventParams>(); |
| ZX_DEBUG_ASSERT(params.subevent_code == kLEAdvertisingReportSubeventCode); |
| |
| auto subevent_params = |
| event.le_event_params<LEAdvertisingReportSubeventParams>(); |
| |
| remaining_reports_ = subevent_params->num_reports; |
| remaining_bytes_ = event.view().payload_size() - sizeof(LEMetaEventParams) - |
| sizeof(LEAdvertisingReportSubeventParams); |
| ptr_ = subevent_params->reports; |
| } |
| |
| bool AdvertisingReportParser::GetNextReport( |
| const LEAdvertisingReportData** out_data, |
| int8_t* out_rssi) { |
| ZX_DEBUG_ASSERT(out_data); |
| ZX_DEBUG_ASSERT(out_rssi); |
| |
| if (encountered_error_ || !HasMoreReports()) |
| return false; |
| |
| const LEAdvertisingReportData* data = |
| reinterpret_cast<const LEAdvertisingReportData*>(ptr_); |
| |
| // Each report contains the all the report data, followed by the advertising |
| // payload, followed by a single octet for the RSSI. |
| size_t report_size = sizeof(*data) + data->length_data + 1; |
| if (report_size > remaining_bytes_) { |
| // Report exceeds the bounds of the packet. |
| encountered_error_ = true; |
| return false; |
| } |
| |
| remaining_bytes_ -= report_size; |
| remaining_reports_--; |
| ptr_ += report_size; |
| |
| *out_data = data; |
| *out_rssi = *(ptr_ - 1); |
| |
| return true; |
| } |
| |
| bool AdvertisingReportParser::HasMoreReports() { |
| if (encountered_error_) |
| return false; |
| |
| if (!!remaining_reports_ != !!remaining_bytes_) { |
| // There should be no bytes remaining if there are no reports left to parse. |
| encountered_error_ = true; |
| return false; |
| } |
| return !!remaining_reports_; |
| } |
| |
| } // namespace hci |
| } // namespace bt |