Broken Ftp Connection and big files problem

I have a problem with big-files downloading.
Does anybody know how to resume downloading using FTP-connection?
Or how can I get bytes from FTP connected file using something like random access to avoid the restart of downloading the file?
"InputStream" does not support "seek"-like methods.

From RFC 959
RESTART (REST)
The argument field represents the server marker at which
file transfer is to be restarted. This command does not
cause file transfer but skips over the file to the specified
data checkpoint. This command shall be immediately followed
by the appropriate FTP service command which shall cause
file transfer to resume.
You should also be aware of RFC 959 Section 3.4.2 on BLOCK MODE transfers which is what allows FTP to REST a connection and "skip" n-bytes of a file.

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