1 files changed, 68 insertions, 0 deletions
diff --git a/pw_system/transfer_service.cc b/pw_system/transfer_service.cc
new file mode 100644
index 000000000..7a68376cc
--- /dev/null
+++ b/pw_system/transfer_service.cc
@@ -0,0 +1,68 @@
+// Copyright 2023 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "pw_system/transfer_service.h"
+
+#include "pw_system/file_manager.h"
+
+namespace pw::system {
+namespace {
+// The maximum number of concurrent transfers the thread should support as
+// either a client or a server. These can be set to 0 (if only using one or
+// the other).
+constexpr size_t kMaxConcurrentClientTransfers = 5;
+constexpr size_t kMaxConcurrentServerTransfers = 3;
+
+// The maximum payload size that can be transmitted by the system's
+// transport stack. This would typically be defined within some transport
+// header.
+constexpr size_t kMaxTransmissionUnit = 512;
+
+// The maximum amount of data that should be sent within a single transfer
+// packet. By necessity, this should be less than the max transmission unit.
+//
+// pw_transfer requires some additional per-packet overhead, so the actual
+// amount of data it sends may be lower than this.
+constexpr size_t kMaxTransferChunkSizeBytes = 480;
+
+// In a write transfer, the maximum number of bytes to receive at one time
+// (potentially across multiple chunks), unless specified otherwise by the
+// transfer handler's stream::Writer.
+constexpr size_t kDefaultMaxBytesToReceive = 1024;
+
+// Buffers for storing and encoding chunks (see documentation above).
+std::array<std::byte, kMaxTransferChunkSizeBytes> chunk_buffer;
+std::array<std::byte, kMaxTransmissionUnit> encode_buffer;
+
+transfer::Thread<kMaxConcurrentClientTransfers, kMaxConcurrentServerTransfers>
+    transfer_thread(chunk_buffer, encode_buffer);
+
+transfer::TransferService transfer_service(transfer_thread,
+                                           kDefaultMaxBytesToReceive);
+}  // namespace
+
+void RegisterTransferService(rpc::Server& rpc_server) {
+  rpc_server.RegisterService(transfer_service);
+}
+
+void InitTransferService() {
+  // the handlers need to be registered after the transfer thread has started
+  for (auto handler : GetFileManager().GetTransferHandlers()) {
+    transfer_service.RegisterHandler(*handler);
+  }
+}
+
+transfer::TransferThread& GetTransferThread() { return transfer_thread; }
+
+}  // namespace pw::system