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Download data verification?

post #1 of 4
Thread Starter 
What measures does the current internet protocol have in regards of data verification? Does winrar itself have the measures built in, that if the data doesn't match some stipulated checksum then it won't unpack?
post #2 of 4
In general, data verification is done through checksums. http://en.wikipedia.org/wiki/Checksum
Winrar does employ the use of CRC i believe.
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weehee
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post #3 of 4
Thread Starter 
Does that apply to all kinds of downloads, or just special formats like winrar? Like if you just saved a simple mp3 or jpg file, does the network do the checksum for you?

I downloaded a bunch of videos and rars, now I want to archive them but I'm beginning to doubt their data integrity. An executable may not run if there is a problem, but a raw file like a bmp may still be readable if only a tiny bit is changed.
post #4 of 4
TCP provides a checksum for protecting the payload and addressing information from the TCP and IP headers. Packets with incorrect checksums are discarded within the network stack, and eventually get retransmitted using ARQ, either explicitly (such as through triple-ack) or implicitly due to a timeout.

http://en.wikipedia.org/wiki/Error_d...and_correction

Also, as stated various file formats implement their own types of error correction, but this exists at the application level and seems a bit off topic since you have requested features of 'the current internet protocol'.
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