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b90d9b29d8
Adds a PersistentBuffer object that acts as a persistent form of a MemoryWriterBuffer. Change-Id: I61db1a77476ceececd088fd60bc10bfaf1b99e0e Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/39360 Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Armando Montanez <amontanez@google.com>
44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_persistent_ram/persistent_buffer.h"
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#include "pw_bytes/span.h"
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#include "pw_checksum/crc16_ccitt.h"
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#include "pw_status/status.h"
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namespace pw::persistent_ram {
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Status PersistentBufferWriter::DoWrite(ConstByteSpan data) {
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if (ConservativeWriteLimit() == 0) {
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return Status::OutOfRange();
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}
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if (ConservativeWriteLimit() < data.size_bytes()) {
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return Status::ResourceExhausted();
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}
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if (data.empty()) {
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return OkStatus();
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}
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std::memcpy(buffer_.data() + size_, data.data(), data.size_bytes());
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// Only checksum newly written data.
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checksum_ = checksum::Crc16Ccitt::Calculate(
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ByteSpan(buffer_.data() + size_, data.size_bytes()), checksum_);
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size_ += data.size_bytes();
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return OkStatus();
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}
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} // namespace pw::persistent_ram
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