1 files changed, 39 insertions, 0 deletions
diff --git a/pw_system/transfer_handlers.cc b/pw_system/transfer_handlers.cc
new file mode 100644
index 000000000..2737f8e8f
--- /dev/null
+++ b/pw_system/transfer_handlers.cc
@@ -0,0 +1,39 @@
+// 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_handlers.h"
+
+namespace pw::system {
+
+TracePersistentBufferTransfer::TracePersistentBufferTransfer(
+    uint32_t id, TracePersistentBuffer& persistent_buffer)
+    : transfer::ReadOnlyHandler(id),
+      persistent_buffer_(persistent_buffer),
+      reader_({}) {
+  set_reader(reader_);
+}
+
+Status TracePersistentBufferTransfer::PrepareRead() {
+  if (!persistent_buffer_.has_value()) {
+    return Status::Unavailable();
+  }
+
+  // As seeking is not yet supported, reinitialize the reader from the start
+  // of the snapshot buffer.
+  new (&reader_) stream::MemoryReader(
+      pw::ConstByteSpan{persistent_buffer_.data(), persistent_buffer_.size()});
+
+  return OkStatus();
+}
+
+}  // namespace pw::system