Function WriteFileFooter

cpp/src/arrow/ipc/metadata_internal.cc:1400–1437

}

Status WriteFileFooter(const Schema& schema, const std::vector<FileBlock>& dictionaries,
                       const std::vector<FileBlock>& record_batches,
                       const std::shared_ptr<const KeyValueMetadata>& metadata,
                       io::OutputStream* out) {
  FBB fbb;

  flatbuffers::Offset<flatbuf::Schema> fb_schema;
  DictionaryFieldMapper mapper(schema);
  RETURN_NOT_OK(SchemaToFlatbuffer(fbb, schema, mapper, &fb_schema));

#ifndef NDEBUG
  for (size_t i = 0; i < dictionaries.size(); ++i) {
    DCHECK(bit_util::IsMultipleOf8(dictionaries[i].offset)) << i;
    DCHECK(bit_util::IsMultipleOf8(dictionaries[i].metadata_length)) << i;
    DCHECK(bit_util::IsMultipleOf8(dictionaries[i].body_length)) << i;
  }

  for (size_t i = 0; i < record_batches.size(); ++i) {
    DCHECK(bit_util::IsMultipleOf8(record_batches[i].offset)) << i;
    DCHECK(bit_util::IsMultipleOf8(record_batches[i].metadata_length)) << i;
    DCHECK(bit_util::IsMultipleOf8(record_batches[i].body_length)) << i;
  }
#endif

  auto fb_dictionaries = FileBlocksToFlatbuffer(fbb, dictionaries);
  auto fb_record_batches = FileBlocksToFlatbuffer(fbb, record_batches);

  auto fb_custom_metadata = SerializeCustomMetadata(fbb, metadata);

  auto footer =
      flatbuf::CreateFooter(fbb, kCurrentMetadataVersion, fb_schema, fb_dictionaries,
                            fb_record_batches, fb_custom_metadata);
  fbb.Finish(footer);

  int32_t size = fbb.GetSize();

  return out->Write(fbb.GetBufferPointer(), size);
}

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