1 // Copyright 2023 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #include "pw_system/transfer_handlers.h"
15
16 namespace pw::system {
17
TracePersistentBufferTransfer(uint32_t id,TracePersistentBuffer & persistent_buffer)18 TracePersistentBufferTransfer::TracePersistentBufferTransfer(
19 uint32_t id, TracePersistentBuffer& persistent_buffer)
20 : transfer::ReadOnlyHandler(id),
21 persistent_buffer_(persistent_buffer),
22 reader_({}) {
23 set_reader(reader_);
24 }
25
PrepareRead()26 Status TracePersistentBufferTransfer::PrepareRead() {
27 if (!persistent_buffer_.has_value()) {
28 return Status::Unavailable();
29 }
30
31 // As seeking is not yet supported, reinitialize the reader from the start
32 // of the snapshot buffer.
33 new (&reader_) stream::MemoryReader(
34 pw::ConstByteSpan{persistent_buffer_.data(), persistent_buffer_.size()});
35
36 return OkStatus();
37 }
38
39 } // namespace pw::system
40