chenzero created NET-652:
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Summary: Ftp Connection Resuming
Key: NET-652
URL: https://issues.apache.org/jira/browse/NET-652
Project: Commons Net
Issue Type: Improvement
Components: FTP
Affects Versions: 3.6
Reporter: chenzero
In a unstable networking, it can not download a relative big file from FTP
server.
For most FTP servers, the "REST" command is supported, and can be used to
specify the transfer starting offset.
in additional, a progress data is saved at the end of the local fie.
The format is: signature(32 bytes) + remoteFile timestamp(long) + transferred
offset(long)
so, the whole progress data is 48 bytes.
if connection broken, the FtpClient will first read progress data from the
local file
and transfer resumed from the offset.
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