void Downloader::NeededChunk::put_block(uint32_t offset, const blob& content) {
auto inserted = file_map_.insert({offset, content.size()}).second;
if(inserted) {
#ifndef FOPEN_BACKEND
std::copy(content.begin(), content.end(), mapped_file_.data()+offset);
#else
if(wrapped_file_.ios().tellp() != offset)
wrapped_file_.ios().seekp(offset);
wrapped_file_.ios().write((char*)content.data(), content.size());
#endif
}
}
