I have a question about quickpar. Sometimes I have a large, downloaded rar/par2 archive that doesn't have enough pieces to fix. What I'd like to do is have quickpar fix what it can, starting with the first rar piece. That way I can run winrar, tell it to keep incomplete files, and at least get most of the original file back.
Can someone tell me how to do this? The repair button is grayed out in quickpar.
* unfrostedpoptart wrote in news.software.readers:> Hi.
I have a question about quickpar. Sometimes I have a large, downloaded> rar/par2 archive that doesn't have enough pieces to fix. What I'd like> to do is have quickpar fix what it can, starting with the first rar> piece. That way I can run winrar, tell it to keep incomplete files,> and at least get most of the original file back.
Can someone tell me how to do this? The repair button is grayed out in> quickpar.
It is mathematically impossible for Quickpar to accomplish what you ask.
-- David QOTD: "You want me to put *holes* in my ears and hang things from them? How... tribal."
It is mathematically impossible for Quickpar to accomplish what you ask.
If it was, you could just keep running it until it had enough good data to finish the job. Obviously, that's not going to happen. -- "Officer, I know I was going faster than 55MPH, but I wasn't going to be on the road an hour." - Steven Wright
Unfrostedpoptart 23 January 2005 08:37:31 [ permanent link ]
I knew that I couldn't repair the entire archive. I thought it would be possible to use the data in the par2 files I had to repair some of the rar files. I understand parity, hashes, and CRCs, but more advanced error correction algorithms tend to give me headaches! Is there a good website that explains, for non math majors, how pars works? Thanks,
I knew that I couldn't repair the entire archive. I thought it would> be possible to use the data in the par2 files I had to repair some> of the rar files. I understand parity, hashes, and CRCs, but more> advanced error correction algorithms tend to give me headaches! Is> there a good website that explains, for non math majors, how pars> works? Thanks,
Murray Peterson 23 January 2005 09:23:43 [ permanent link ]
"unfrostedpoptart" <david@therogoffs.com> wrote in news:1106458651.028114.193610@z14g2000cwz.googlegroups.com:
I knew that I couldn't repair the entire archive. I thought it would be> possible to use the data in the par2 files I had to repair some of the> rar files.
Definitely not possible unless the poster provided par files for each individual rar file.
I understand parity, hashes, and CRCs, but more advanced> error correction algorithms tend to give me headaches! Is there a good> website that explains, for non math majors, how pars works?
You are asking for the impossible here too -- a Reed-Solomon parity code is nothing more (or less) than applied mathematics. To understand how a Reed- Solomon code works, you need to understand the math.
You could also look at CIRC (Cross Interleaved Reed-Solomon Code), which is the code used for error correction on all CDs. I'll let you do the google search.
On 22 Jan 2005 14:00:08 -0800, unfrostedpoptart used 15 lines to assert:
I have a question about quickpar. Sometimes I have a large, downloaded> rar/par2 archive that doesn't have enough pieces to fix. What I'd like> to do is have quickpar fix what it can, starting with the first rar> piece. That way I can run winrar, tell it to keep incomplete files,> and at least get most of the original file back.>
Can someone tell me how to do this? The repair button is grayed out in> quickpar.>
As has been pointed out it's mathematically impossible. Simplified reasons being that the available PAR2 stock would have been built from the _total_ of the RARs sources.
In turn it can only regen~repair a same source 'total' target object, and, the damaged (or missing) part of that object must be =< the total available parity blocks to do the job.
For what you want to do a totally different PAR2 stock would have had to have been generated initially; ie. sourced from each of, or from a subset of the total RARs that made up the whole post. Thereby you could then rebuild/repair only those RAR[s] that this different PAR2 set was originated from.
IOW: Parity, in this application and context is an 'all or nothing' useful thing. I think you might be confusing it with (the more simplified) RAR or other 'bytes based' data. Which like you suggested, can be force extract~separated down to incomplete, yet potentially partial salvagable files level data. (nb. files are bytes, not bits oriented).
To illustrate; consider a 512k ECC DRAM module, if it was built with only sufficient parity bit chips to cover and error correct 256k of the total memory on it, it couldn't work at all because the 'target' object is actually a linearВ№ 512k.
Make sense?
Probably not. There's much better technical level explanation stuff out on the web, don't hesitate to fire up your search engine.
[В№] nb: I use the word linear to illustrate a totality, even though we know in operation that memory is actually banks-segmented addressable.
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