hash dupecheck desroys DVDR

cyberal · Post by **cyberal** » 2004-07-03 11:08

Hi!
I have noticed an ugly problem related to the hash dupecheck. :shock:

It seems that in DVDR releases alot of groups just take 1 of the rar-files... rename it to .vob and use it as a sample for the release. Which means we suddenly got 2 files with same hash that we DO want to share.

I don't want this thread to evolve into some pro-con rar discussion, so please... just don't.
What I need is a solution to the problem, cause even if you don't share original.. ALOT of ppl do... especially when it comes to big DVDR movies.

I have been thinking of a possible solution... ofcourse.. there should be no exceptions that could be easily abused by others.

Is it possible to do this: Make the dupefiles NOT count to the sharesize.. so fakers can't raise their share with dupe files... BUT still be able to download the file that was not counted in the sharesize?

CioDu · Post by **CioDu** » 2004-07-03 12:39

well, in Settings -> Advanced I see a "include duplicate files in your file list (duplicates never count towards your share size)"

did you try to check it?

Post by **GargoyleMT** » 2004-07-03 15:30

Interesting, that seems like a lazy practice. However, as CioDu points out, it's easily worked around.

For unpacked DVD images, there are apparently one or two small files that are the same size, and the dupecheck can remove them.

It's just something the user has to be aware of - DC++ already gives them all the information they need to figure it out - it does tell them the duplicate files that it removes.

cyberal · Post by **cyberal** » 2004-07-03 23:15

CioDu> yes, I am aware of that option.. but the file is shown as 0 byte... is it still downloadable you mean?

PseudonympH · Post by **PseudonympH** » 2004-07-04 04:09

Duplicates don't show up as 0 byte in my filelist...

ivulfusbar · Post by **ivulfusbar** » 2004-07-04 07:28

How fun it must be to download the same file twice.. YEAY for using up bandwidth efficiently..

those-has-to-be-the-stupidest-release-groups-i-have-ever-seen-ly'ers. ;))

CioDu · Post by **CioDu** » 2004-07-04 15:06

cyberal wrote:yes, I am aware of that option.. but the file is shown as 0 byte... is it still downloadable you mean?

Same as PseudonympH: I have dupes in my share, and none of them is shown as 0-bytes, and I checked both .DcList and .xml

your problem needs more investigation

Dooble · Post by **Dooble** » 2004-07-04 18:32

I wonder what this should be good for.Use VLC and you should be able to playback any File containing any video stream, including RAR. So who needs a sample file anyway ?

http://www.videolan.org

Post by **GargoyleMT** » 2004-07-05 00:53

cyberal wrote:I am aware of that option.. but the file is shown as 0 byte...

That's not how DC++ avoids counting it towards your share size - it merely subtracts the total size of the file from your published share size when it finds a duplicate. If you set the option so duplicates remain in your list, the file is included when making the list (and the file's size is normal in said list), otherwise the filename is omitted from the share.

cyberal · Post by **cyberal** » 2004-07-05 15:01

oh, so the total size of a filelist (the size shown inside the filelist) is included in the file itself? I thought that value was calculated by the remote client.

Todi · Post by **Todi** » 2004-07-05 15:28

I believe GargoyleMT is talking about the size shown on the userlist, i.e the one sent in $MyINFO, when he says published share size. I've tried to explain how it works here, hope that helps.

Post by **GargoyleMT** » 2004-07-05 20:26

Yup, Todi has it right.

DC++ calculates the share size while making the file list - any duplicates just don't count towards. So, the share size in the user list will not match the total of your list if DC++ is keeping the duplicates in your list.

cyberal · Post by **cyberal** » 2004-07-06 17:35

outch, that kinda makes all those share check clients worthless

ivulfusbar · Post by **ivulfusbar** » 2004-07-06 17:50

cyberal wrote:outch, that kinda makes all those share check clients worthless

Why would it care if eledged size in MyINFO is less than the size counted in the filelist? But yes.. your dear share checking clients have always been worthless. ;))

Post by **GargoyleMT** » 2004-07-06 22:54

cyberal wrote:outch, that kinda makes all those share check clients worthless

Maybe. Obviously sarf wrote the functionality for a reason. And this has been the behavior in DC++ for as long as I can remember (I joined only at 0.181 though).

If the checkers check for exact size and complain if it doesn't match, yes, this would cause problems. If they don't care when you advertise a smaller share size than your list says you have, then it doesn't much matter.

hash dupecheck desroys DVDR

hash dupecheck desroys DVDR

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