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Old 10-06-2003, 12:10 PM   #1
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Default CRC check?

I know that it has been asked many times if FFXP could check files downloaded with the SFV files. I have a somewhat other question/suggestion.

Im wondering if its possible to ask the server for file checksum (CRC32 or MD5) and if it differs from local file then download/skip/upload the file. Like it is now possible with filesize.
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Old 10-07-2003, 10:02 PM   #2
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It's a good idea.
I support it!
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Old 10-08-2003, 07:09 AM   #3
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Yup, provided the ftp server supports it.
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Old 11-03-2003, 10:58 AM   #4
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Thumbs up

Would love to see this ... I occassionally have problems like this when downloading files from *NIX boxes.
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Old 11-03-2003, 12:15 PM   #5
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If you have/site has _that_ bad connection, use ssl. It provides yet another integrity check (Which really isn't neccessary, unless either site or client is having serious hardware/software issues... and in that case, there's no way you could trust the cheksum site would pass)

> My initial question was about detecting random transmission errors in
> the payload (using checksums or by encoding the data...). I assume that
> Erlang just relies on the TCP and IP layer checksums?

If you can't trust your TCP stack, you have bigger problems than
that - your network-mounted filesystems (over SMB (TCP), NFS (TCP) or even
worse, NFS over UDP, go figure!) may be corrupted, so maybe you are not
even compiling the right source. Worse, your HTTP (TCP) or FTP (TCP)
download of Erlang and OTP might be corrupted! Even, your SMTP (TCP) mail
feed might be garbled! Maybe neither of us wrote this?!?

Joke apart: the odds of both the TCP CRC16 and the Ethernet CRC32
(or whatever link-level layer) ending up correct with wrong data are
*really* small.


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check, crc32, file, files, md5

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