Fix message size not accounting for negative numbers

Author: Erimelowo

src/bridge/BridgeTransport.cpp

@@ -81,13 +81,14 @@ void BridgeTransport::OnRecv(const uvw::data_event& event) {
         char len_buf[4];
         recv_buf_.Peek(len_buf, 4);
         uint32_t size = 0;
-        size |= static_cast<uint32_t>(len_buf[0]) << 0;
-        size |= static_cast<uint32_t>(len_buf[1]) << 8;
-        size |= static_cast<uint32_t>(len_buf[2]) << 16;
-        size |= static_cast<uint32_t>(len_buf[3]) << 24;
+        size = static_cast<uint32_t>(static_cast<uint8_t>(len_buf[0])) |
+              (static_cast<uint32_t>(static_cast<uint8_t>(len_buf[1])) << 8) |
+              (static_cast<uint32_t>(static_cast<uint8_t>(len_buf[2])) << 16) |
+              (static_cast<uint32_t>(static_cast<uint8_t>(len_buf[3])) << 24);
 
         if (size > VRBRIDGE_MAX_MESSAGE_SIZE) {
             logger_->Log("message size overflow");
+            logger_->Log(std::to_string(size).c_str());
             ResetConnection();
             return;
         }