103         libusb_transfer* transfer = nullptr;  member
110         libusb_transfer* transfer;  member
130         libusb_free_transfer(read_block->transfer);  in Cleanup()
132         read_block->transfer = nullptr;  in Cleanup()
139         if (read_block->transfer->status == LIBUSB_TRANSFER_CANCELLED) {  in MaybeCleanup()
151     static void LIBUSB_CALL header_read_cb(libusb_transfer* transfer) {  in header_read_cb()
152         auto read_block = static_cast<ReadBlock*>(transfer->user_data);  in header_read_cb()
161         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {  in header_read_cb()
162             std::string msg = StringPrintf("usb read failed: status = %d", transfer->status);  in header_read_cb()
169         if (transfer->actual_length != sizeof(amessage)) {  in header_read_cb()
171                                            transfer->actual_length);  in header_read_cb()
180         memcpy(&amsg, transfer->buffer, sizeof(amsg));  in header_read_cb()
199     static void LIBUSB_CALL payload_read_cb(libusb_transfer* transfer) {  in payload_read_cb()
200         auto read_block = static_cast<ReadBlock*>(transfer->user_data);  in payload_read_cb()
208         if (transfer->status != LIBUSB_TRANSFER_COMPLETED) {  in payload_read_cb()
209             std::string msg = StringPrintf("usb read failed: status = %d", transfer->status);  in payload_read_cb()
216         if (transfer->actual_length != transfer->length) {  in payload_read_cb()
219                                  transfer->length, transfer->actual_length);  in payload_read_cb()
234     static void LIBUSB_CALL write_cb(libusb_transfer* transfer) {  in write_cb()
235         auto write_block = static_cast<WriteBlock*>(transfer->user_data);  in write_cb()
238         bool succeeded = transfer->status == LIBUSB_TRANSFER_COMPLETED;  in write_cb()
242             libusb_free_transfer(transfer);  in write_cb()
262         read->transfer = libusb_alloc_transfer(0);  in CreateRead()
263         if (!read->transfer) {  in CreateRead()
266         libusb_fill_bulk_transfer(read->transfer, device_handle_.get(), read_endpoint_, nullptr, 0,  in CreateRead()
272         read->transfer->buffer = reinterpret_cast<unsigned char*>(read->block.data());  in SubmitRead()
273         read->transfer->length = length;  in SubmitRead()
275         int rc = libusb_submit_transfer(read->transfer);  in SubmitRead()
288         write->transfer = libusb_alloc_transfer(0);  in SubmitWrite()
289         if (!write->transfer) {  in SubmitWrite()
293         libusb_fill_bulk_transfer(write->transfer, device_handle_.get(), write_endpoint_,  in SubmitWrite()
296         libusb_submit_transfer(write->transfer);  in SubmitWrite()
606                     libusb_cancel_transfer(write->transfer);  in Stop()
619             if (header_read_.transfer) {  in Stop()
621                     libusb_cancel_transfer(header_read_.transfer);  in Stop()
623                     libusb_free_transfer(header_read_.transfer);  in Stop()
627             if (payload_read_.transfer) {  in Stop()
629                     libusb_cancel_transfer(payload_read_.transfer);  in Stop()
631                     libusb_free_transfer(payload_read_.transfer);  in Stop()