#14 ftp: small addition to support segmented dnld

closed-fixed
ftp (5)
5
2001-11-17
2001-05-28
Anonymous
No

added a couple of lines to the Reget procedure, so that
it can support segmented downloading and resumption.

This adds 2 additional arguments

Reget {s source {dest ""} {from_bytes 0} {till_bytes
-1}

from_bytes and till_bytes to supply the starting and
ending offsets. Omission of till_bytes, leads to
downloading till the end of file.

Since both the new arguments have benign default
values, existing code should not break. However one
( good ?) side-effect is one cannot use this feature
without supplying a destination file.

Possible use:

multi segment download from the same server

Reget 0 README readme.1 20 120
Reget 0 README readme.2 120 220
Reget 0 README readme.1 220

multi segement download from different servers
Reget 1 README readme.1 20 120
Reget 2 README readme.2 120 220
Reget 3 README readme.1 220

for files which can be easily verified ( .rpm .deb ),
the multi segmented download may be used to speed up
downloads.

== from comp.lang.tcl==

Date: Sun, 27 May 2001 18:36:06 -0700
From: Jeffrey Hobbs <JeffH@ActiveState.com>
To: Sreangsu Acharyya <srean_list@myrealbox.com>
Newsgroups: comp.lang.tcl
Subject: Re: segmented, multi host download using
tcllib

Sreangsu Acharyya wrote:
...
> I needed the functionality of downloading a chunk
from a file from its start
> and end offset, including the feature of resuming an
aborted download.

> I just spent some 15 minutes on it. so its rough, but
if any one thinks this
> could be useful, i can send the patch file ( based on
tcllib 0.8 ) offline

This sounds interesting. Please do post it to the
tcllib patches
area, and one of the maintainers will look at it. If
you are
interested in further changes, I could add you to that
list and
you could work directly on the sources.

--
Jeff Hobbs The Tcl Guy
Senior Developer
http://www.ActiveState.com/
Tcl Support and Productivity Solutions

Discussion

  • patch file to be applied on ftp.tcl of tcllib-0.8

     
    Attachments
    • summary: small addition to support segmented dnld --> ftp: small addition to support segmented dnld
     
    • assigned_to: nobody --> andreas_kupries
     
  • Logged In: YES
    user_id=75003

    Enclosed an updated patch for this feature.

     
    • status: open --> open-fixed
     
  • Updated patch, unified diff

     
    Attachments
  • Logged In: YES
    user_id=75003

    Patch committed to head.

     
    • status: open-fixed --> closed-fixed