You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.3 KiB
44 lines
1.3 KiB
// Copyright 2021 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_persistent_ram/persistent_buffer.h"
|
|
|
|
#include "pw_bytes/span.h"
|
|
#include "pw_checksum/crc16_ccitt.h"
|
|
#include "pw_status/status.h"
|
|
|
|
namespace pw::persistent_ram {
|
|
|
|
Status PersistentBufferWriter::DoWrite(ConstByteSpan data) {
|
|
if (ConservativeWriteLimit() == 0) {
|
|
return Status::OutOfRange();
|
|
}
|
|
if (ConservativeWriteLimit() < data.size_bytes()) {
|
|
return Status::ResourceExhausted();
|
|
}
|
|
if (data.empty()) {
|
|
return OkStatus();
|
|
}
|
|
|
|
std::memcpy(buffer_.data() + size_, data.data(), data.size_bytes());
|
|
|
|
// Only checksum newly written data.
|
|
checksum_ = checksum::Crc16Ccitt::Calculate(
|
|
ByteSpan(buffer_.data() + size_, data.size_bytes()), checksum_);
|
|
size_ += data.size_bytes();
|
|
|
|
return OkStatus();
|
|
}
|
|
|
|
} // namespace pw::persistent_ram
|