Fix HCI parser and packetizer
Issue found from the test H4ProtocolAsyncTest#TestMultiplePackets.
The packetizer does not correctly handle a packet termination
at the beginning of a chunk.
Test: atest --host bluetooth-vendor-interface-hci-test
Bug: 276652301
Change-Id: I1b61efcfa5f817fdb8b5870e81d660be5279fdea
diff --git a/bluetooth/hci/hci_packetizer.cc b/bluetooth/hci/hci_packetizer.cc
index 5b6c443..4135920 100644
--- a/bluetooth/hci/hci_packetizer.cc
+++ b/bluetooth/hci/hci_packetizer.cc
@@ -51,9 +51,10 @@
bool HciPacketizer::OnDataReady(PacketType packet_type,
const std::vector<uint8_t>& buffer,
- size_t offset) {
+ size_t* offset) {
bool packet_completed = false;
- size_t bytes_available = buffer.size() - offset;
+ size_t bytes_available = buffer.size() - *offset;
+
switch (state_) {
case HCI_HEADER: {
size_t header_size =
@@ -62,18 +63,20 @@
bytes_remaining_ = header_size;
packet_.clear();
}
+
size_t bytes_to_copy = std::min(bytes_remaining_, bytes_available);
- packet_.insert(packet_.end(), buffer.begin() + offset,
- buffer.begin() + offset + bytes_to_copy);
+ packet_.insert(packet_.end(), buffer.begin() + *offset,
+ buffer.begin() + *offset + bytes_to_copy);
bytes_remaining_ -= bytes_to_copy;
bytes_available -= bytes_to_copy;
+ *offset += bytes_to_copy;
+
if (bytes_remaining_ == 0) {
bytes_remaining_ = HciGetPacketLengthForType(packet_type, packet_);
if (bytes_remaining_ > 0) {
state_ = HCI_PAYLOAD;
if (bytes_available > 0) {
- packet_completed =
- OnDataReady(packet_type, buffer, offset + bytes_to_copy);
+ packet_completed = OnDataReady(packet_type, buffer, offset);
}
} else {
packet_completed = true;
@@ -84,9 +87,10 @@
case HCI_PAYLOAD: {
size_t bytes_to_copy = std::min(bytes_remaining_, bytes_available);
- packet_.insert(packet_.end(), buffer.begin() + offset,
- buffer.begin() + offset + bytes_to_copy);
+ packet_.insert(packet_.end(), buffer.begin() + *offset,
+ buffer.begin() + *offset + bytes_to_copy);
bytes_remaining_ -= bytes_to_copy;
+ *offset += bytes_to_copy;
if (bytes_remaining_ == 0) {
state_ = HCI_HEADER;
packet_completed = true;
@@ -94,6 +98,7 @@
break;
}
}
+
return packet_completed;
}