Method handleOtherEncoding

src/HttpResponseCommand.cc:401–486

}

bool HttpResponseCommand::handleOtherEncoding(
    std::unique_ptr<HttpResponse> httpResponse)
{
  // We assume that RequestGroup::getTotalLength() == 0 here
  if (getOption()->getAsBool(PREF_DRY_RUN)) {
    getRequestGroup()->initPieceStorage();
    onDryRunFileFound();
    return true;
  }

  if (getRequest()->getMethod() == Request::METHOD_HEAD) {
    poolConnection();
    getRequest()->setMethod(Request::METHOD_GET);
    return prepareForRetry(0);
  }

  // In this context, knowsTotalLength() is true only when the file is
  // really zero-length.

  auto streamFilter = getTransferEncodingStreamFilter(
      httpResponse.get(), getContentEncodingStreamFilter(httpResponse.get()));
  // If chunked transfer-encoding is specified, we have to read end of
  // chunk markers(0\r\n\r\n, for example).
  bool chunkedUsed = streamFilter && streamFilter->getName() ==
                                         ChunkedDecodingStreamFilter::NAME;

  // For zero-length file, check existing file comparing its size
  if (!chunkedUsed && getDownloadContext()->knowsTotalLength() &&
      getRequestGroup()->downloadFinishedByFileLength()) {
    getRequestGroup()->initPieceStorage();

    // TODO Known issue: if .aria2 file exists, it will not be deleted
    // on successful verification, because .aria2 file is not loaded.
    // See also FtpNegotiationCommand::onFileSizeDetermined()
    if (getDownloadContext()->isChecksumVerificationNeeded()) {
      A2_LOG_DEBUG("Zero length file exists. Verify checksum.");
      auto entry = make_unique<ChecksumCheckIntegrityEntry>(getRequestGroup());
      entry->initValidator();
      getPieceStorage()->getDiskAdaptor()->openExistingFile();
      getDownloadEngine()->getCheckIntegrityMan()->pushEntry(std::move(entry));
    }
    else {
      getPieceStorage()->markAllPiecesDone();
      getDownloadContext()->setChecksumVerified(true);
      A2_LOG_NOTICE(fmt(MSG_DOWNLOAD_ALREADY_COMPLETED,
                        GroupId::toHex(getRequestGroup()->getGID()).c_str(),
                        getRequestGroup()->getFirstFilePath().c_str()));
    }
    poolConnection();
    return true;
  }

  getRequestGroup()->adjustFilename(std::make_shared<NullProgressInfoFile>());
  getRequestGroup()->initPieceStorage();
  getPieceStorage()->getDiskAdaptor()->initAndOpenFile();

  // Local file size becomes zero when DiskAdaptor::initAndOpenFile()
  // is called. So zero-length file is complete if chunked encoding is