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List:       wget
Subject:    RE: suggestion
From:       Herold Heiko <Heiko.Herold () previnet ! it>
Date:       2001-07-11 8:57:47
[Download RAW message or body]

Something like that has been suggested already, but is not yet
implemented (at least not in the "official" source, which is at 1.7
btw).

For any chance, are you using a proxy ? Some (braindead imho) of those
insert a string like "connection interrupted" at the end of a failed
download. If you can get a good copy of a ruined file try comparing them
in order to understand exactly where they are different, and try to
match the differences with the offsets when wget had to continue a
download (from a wget -v output).

Heiko

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>-----Original Message-----
>From: Luis Yanes [mailto:melus0@teleline.es]
>Sent: Wednesday, July 11, 2001 2:24 AM
>To: bug-wget@gnu.org
>Subject: suggestion
>
>
>Dear team. First let me thank you for a so great utility.
>
>After retrieving huge iso files with wget 1.53 and finding them
>unusable due to checksum failure, though about a possible enhancement
>for wget.
>
>I think that the most probably transmission errors will ocurr just
>before a disconect event, giving the last few bytes the greatest
>chance to become corrupt, even using TCP. Althought haven't any
>meassurement of this affirmation.
>
>Reviewing the wget docs, haven't found anything related to this.
>When using the -c, --continue options for http or ftp, requesting for
>a few overlapping bytes could solve this potential problem. A default
>overlap of 256 bytes to 1K would have an insigficant impact on data
>throughput and may avoid a huge trashed file.
>
>Allow me suggest the following syntax:
>
>--overlap         overlap (default bytes) while continuing a download
>--overlap=BYTES   overlap BYTES while continuing a broken download
>
>--ignore-overlap  If overlap segment differ use new/old. Well we are in
>trouble. This would need more discussion.
>
>I haven't any experience with gnu software developping, but if 
>you don't
>find this interesting enough to work on it, I could try to make a patch
>to the lattest wget code for your review to include in the 
>distribution.
>
>-- 
>73's de Luis
>
>mail: melus0@teleline.es
>Ampr: eb7gwl.ampr.org
>http://www.terra.es/personal2/melus0/ <- PCBs for Homebrewed Hardware
>

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