Method Write

lib/mdflib/mdflib/src/dg4block.cpp:112–153

}

uint64_t Dg4Block::Write(std::streambuf& buffer) {
  const bool update = FilePosition() > 0;  // True if already written to file
  if (!update) {
    block_type_ = "##DG";
    block_length_ = 24 + (4 * 8) + 8;
    link_list_.resize(4, 0);
  }

  WriteLink4List(buffer, cg_list_, kIndexCg,
              UpdateOption::DoUpdateAllBlocks); // Save nof samples in CG block
  WriteMdComment(buffer, kIndexMd);


  uint64_t bytes = update ? MdfBlock::Update(buffer) : MdfBlock::Write(buffer);
  if (update) {
    bytes = block_length_;
  } else {
    bytes += WriteNumber(buffer, rec_id_size_);
    bytes += WriteBytes(buffer, 7);
    UpdateBlockSize(buffer, bytes);
    // Need to update the signal data link for any channels referencing
    // VLSD CG blocks.
    for (auto& cg4 : cg_list_) {
      if (cg4 && (cg4->Flags() & CgFlag::VlsdChannel) ) {
        // The previous CG block has a channel which needs to update its
        // signal data link.
        auto* other_cg4 = FindCgRecordId(cg4->RecordId() -1);
        auto* cn4 = other_cg4 != nullptr ?
                 other_cg4->FindVlsdChannel(cg4->RecordId()) : nullptr;
        if (cn4 != nullptr) {
          cn4->UpdateDataLink(buffer, cg4->FilePosition());
        }
      }
    }
  }
  // Need to write any data block, so it is positioned last in the file
  // as any DT block should be appended with data bytes. The DT block must be
  // last in the file
  WriteLink4List(buffer, block_list_, kIndexData,
                 UpdateOption::DoUpdateOnlyLastBlock); // Update last HL or DT
  return bytes;
}

uint64_t Dg4Block::DataSize() const { return DataListBlock::DataSize(); }