Method ReadMeta

src/leveldb/table/table.cc:84–111

}

void Table::ReadMeta(const Footer& footer) {
  if (rep_->options.filter_policy == nullptr) {
    return;  // Do not need any metadata
  }

  // TODO(sanjay): Skip this if footer.metaindex_handle() size indicates
  // it is an empty block.
  ReadOptions opt;
  if (rep_->options.paranoid_checks) {
    opt.verify_checksums = true;
  }
  BlockContents contents;
  if (!ReadBlock(rep_->file, opt, footer.metaindex_handle(), &contents).ok()) {
    // Do not propagate errors since meta info is not needed for operation
    return;
  }
  Block* meta = new Block(contents);

  Iterator* iter = meta->NewIterator(BytewiseComparator());
  std::string key = "filter.";
  key.append(rep_->options.filter_policy->Name());
  iter->Seek(key);
  if (iter->Valid() && iter->key() == Slice(key)) {
    ReadFilter(iter->value());
  }
  delete iter;
  delete meta;
}

void Table::ReadFilter(const Slice& filter_handle_value) {
  Slice v = filter_handle_value;