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Q: Looking for a math genius... ( No Answer,   1 Comment )
Subject: Looking for a math genius...
Category: Computers > Algorithms
Asked by: zeusdman-ga
List Price: $50.00
Posted: 27 Sep 2006 07:05 PDT
Expires: 27 Oct 2006 07:05 PDT
Question ID: 768855
I have an input byte stream consisting of numbers in the set {0 - 15}
exclusively of about 1000 bytes.

What I would like to do is to be able to somehow store that
mathematically in ONE unsigned integer and then, having in hand the
the last byte value that was "encoded" into that unsigned integer,
mathematically reverse it back to the original byte stream.

I am hoping there is a way to mathematically encode the values into an
integer and then decoding them back.

Do you know how?

Request for Question Clarification by maniac-ga on 28 Sep 2006 18:17 PDT
Hello Zeusdman,

As noted by frankcorrao, the general solution is not feasible unless
you know something before hand about the data (for example, the data
is NOT random).

Basically, you are trying to compress roughly 4000 bits of information
into a single "unsigned integer" (likely 32 bits, but could be 64). A
100 to 1 compression of image data is possible with a "lossy"
algorithm - the original data is NOT reproduced exactly from the
stored data (but it does "somewhat" look OK as a reproduction of the

Can you describe the type of data in more detail to see if there is
some way to encode the information to achieve that level of

There is no answer at this time.

Subject: Re: Looking for a math genius...
From: frankcorrao-ga on 27 Sep 2006 20:53 PDT
This is not possible for the general case of some random stream of
bytes. is a good
place to start if you need justications.

Intuitively, should you realize that it is not possible to compress
essentially 125 bytes of data (0-15 is 4 bits) into bytes of data for
all random formulations of those 125 bytes.

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