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https://fuchsia.googlesource.com/third_party/pigweed.googlesource.com/pigweed/pigweed
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6c24c0638b
- Implement Delete function. - Add new tests and enable a few that pass now. - Have out-of-bounds flash reads return OUT_OF_RANGE to differentiate from INVALID_ARGUMENT. Change-Id: I5d65ad36913b30f2554bd12eaba26127ae0ec8f2
116 lines
3.9 KiB
C++
116 lines
3.9 KiB
C++
// Copyright 2020 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_kvs_private/format.h"
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#include "pw_kvs_private/macros.h"
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#include "pw_log/log.h"
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namespace pw::kvs {
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using std::byte;
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using std::string_view;
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EntryHeader::EntryHeader(uint32_t magic,
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ChecksumAlgorithm* algorithm,
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string_view key,
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span<const byte> value,
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uint32_t value_length,
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uint32_t key_version)
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: magic_(magic),
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checksum_(kNoChecksum),
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key_value_length_(value_length << kValueLengthShift |
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(key.size() & kKeyLengthMask)),
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key_version_(key_version) {
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if (algorithm != nullptr) {
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CalculateChecksum(algorithm, key, value);
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std::memcpy(&checksum_,
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algorithm->state().data(),
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std::min(algorithm->size_bytes(), sizeof(checksum_)));
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}
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}
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Status EntryHeader::VerifyChecksum(ChecksumAlgorithm* algorithm,
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string_view key,
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span<const byte> value) const {
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if (algorithm == nullptr) {
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return checksum() == kNoChecksum ? Status::OK : Status::DATA_LOSS;
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}
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CalculateChecksum(algorithm, key, value);
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return algorithm->Verify(checksum_bytes());
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}
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Status EntryHeader::VerifyChecksumInFlash(FlashPartition* partition,
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FlashPartition::Address address,
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ChecksumAlgorithm* algorithm) const {
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// Read the entire entry piece-by-piece into a small buffer.
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// TODO: This read may be unaligned. The partition can handle this, but
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// consider creating a API that skips the intermediate buffering.
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byte buffer[32];
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// Read and compare the magic and checksum.
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TRY(partition->Read(address, checked_data_offset(), buffer));
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if (std::memcmp(this, buffer, checked_data_offset()) != 0) {
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static_assert(sizeof(unsigned) >= sizeof(uint32_t));
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unsigned actual_magic;
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std::memcpy(&actual_magic, &buffer[0], sizeof(uint32_t));
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unsigned actual_checksum;
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std::memcpy(&actual_checksum, &buffer[4], sizeof(uint32_t));
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PW_LOG_ERROR(
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"Expected: magic=%08x, checksum=%08x; "
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"Actual: magic=%08x, checksum=%08x",
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unsigned(magic()),
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unsigned(checksum()),
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actual_magic,
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actual_checksum);
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return Status::DATA_LOSS;
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}
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if (algorithm == nullptr) {
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return Status::OK;
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}
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algorithm->Reset();
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// Read and calculate the checksum of the remaining header, key, and value.
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address += checked_data_offset();
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size_t bytes_to_read = size() - checked_data_offset();
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while (bytes_to_read > 0u) {
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const size_t read_size = std::min(sizeof(buffer), bytes_to_read);
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TRY(partition->Read(address, read_size, buffer));
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algorithm->Update(buffer, read_size);
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address += read_size;
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bytes_to_read -= read_size;
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}
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return algorithm->Verify(checksum_bytes());
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}
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void EntryHeader::CalculateChecksum(ChecksumAlgorithm* algorithm,
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const string_view key,
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span<const byte> value) const {
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algorithm->Reset();
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algorithm->Update(reinterpret_cast<const byte*>(this) + checked_data_offset(),
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sizeof(*this) - checked_data_offset());
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algorithm->Update(as_bytes(span(key)));
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algorithm->Update(value);
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}
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} // namespace pw::kvs
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