Infinite cycle with MediaHttpDownloader setContentRange download

[sbespalko]

When trying to

downloader.setContentRange(0, fileSize / 2);
downloader.download();

The process never ends, because of
mediaContentLength always is maximum content Range and expression:
if( mediaContentLength <= nextByteIndex ) { ... return; }
never give true

[mattwhisenhunt]

Thank you for filing this issue.
Are you building from source or using a release/snapshot? Is this bug related to this commit I merged recently?

[sbespalko]

I use release 1.23.0
To understand the problem, please, look the test code:

  @Test
  public void downloadPartialNeverEnds() throws IOException {
    MediaHttpDownloader downloader = new MediaHttpDownloader(new NetHttpTransport(), null);
    downloader.setContentRange(0, 1024);
    OutputStream out = new FileOutputStream(new File("test-file1"));
    downloader.download(new GenericUrl("http://speedtest.ftp.otenet.gr/files/test100k.db"), out);
  }

This method never ends. But expected, that it will download only 1kb.

[alvazai]

I have exactly the same problem. I started palying with Google Drive JAVA API and everything is quite satisfactory so far with the exception of this problem. I understand that the same goal (partial file download) can be achieved by using lower level HTTP requests but I am unfamiliar with HTTP.

Here is my code:

public byte[] downloadPartial(String googleID, long start, long size) throws GoogleDriveClientException{
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Drive.Files.Get get = driveService.files().get(googleID);
MediaHttpDownloader downloader = get.getMediaHttpDownloader();
downloader.setContentRange(start, start+size-1);
get.executeMediaAndDownloadTo(bos);
return bos.toByteArray();
} catch (IOException ex) {
Logger.getLogger(GoogleDriveProxy.class.getName()).log(Level.SEVERE, null, ex);
throw new GoogleDriveClientException("Failure downloading file: " + ex.getMessage());
}
}

If I comment the line
downloader.setContentRange(start, start+size-1);
everything works but of course the whole file content is downloaded

[alvazai]

So basically I am asking for help. Can anybody suggest few lines of Java code to set the Content Range in some other way, before I take great pains to understand HTTP