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Does some encode function like this exist?


Rifts

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nope. hashes are one way. any sort of cryptography encoding/decoding produces longer data than the source, as does base64 encoding/decoding.

 

the only way to shorten long data is to find repeated sections that are long enough and occur frequently enough to justify processing them, store one copy of the repleted section along with a short token value, then replace each repeat region with the short token. reverse to get back the original.

 

edit: see the lossless sections at this link - http://en.wikipedia.org/wiki/Data_compression

Edited by mac_gyver
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