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// 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.
#pragma once
#include "pw_file/flat_file_system.h"
#include "pw_persistent_ram/persistent_buffer.h"
namespace pw::persistent_ram {
template <size_t kMaxSizeBytes>
class FlatFileSystemPersistentBufferEntry final
: public file::FlatFileSystemService::Entry {
public:
FlatFileSystemPersistentBufferEntry(
std::string_view file_name,
file::FlatFileSystemService::Entry::Id file_id,
file::FlatFileSystemService::Entry::FilePermissions permissions,
PersistentBuffer<kMaxSizeBytes>& persistent_buffer)
: file_name_(file_name),
file_id_(file_id),
permissions_(permissions),
persistent_buffer_(persistent_buffer) {}
StatusWithSize Name(span<char> dest) final {
if (file_name_.empty() || !persistent_buffer_.has_value()) {
return StatusWithSize(Status::NotFound(), 0);
}
size_t bytes_to_copy = std::min(dest.size_bytes(), file_name_.size());
std::memcpy(dest.data(), file_name_.data(), bytes_to_copy);
if (bytes_to_copy != file_name_.size()) {
return StatusWithSize(Status::ResourceExhausted(), bytes_to_copy);
}
return StatusWithSize(OkStatus(), bytes_to_copy);
}
size_t SizeBytes() final { return persistent_buffer_.size(); }
Status Delete() final {
persistent_buffer_.clear();
return pw::OkStatus();
}
file::FlatFileSystemService::Entry::FilePermissions Permissions()
const final {
return permissions_;
}
file::FlatFileSystemService::Entry::Id FileId() const final {
return file_id_;
}
private:
const std::string_view file_name_;
const file::FlatFileSystemService::Entry::Id file_id_;
const file::FlatFileSystemService::Entry::FilePermissions permissions_;
PersistentBuffer<kMaxSizeBytes>& persistent_buffer_;
};
} // namespace pw::persistent_ram
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