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Geek Culture / Algorithm

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MrTAToad
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Posted: 20th Jun 2003 15:36 Edited at: 20th Jun 2003 15:40
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Does anyone know of a good (ie fast and small) to convert a 16 character text string (which can have ASCII1 to ASCII255 in it) to a 16-bit number between 0 and 65535 ?

The only way I can think of doing it is taking a group of say, 4 characters and multiplying the ASCII value of each by 0.0039 (1/255) and the 4 values together, make an integer and the shift left or right according to where in the bitfield I want it.

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!
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IanM
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Posted: 20th Jun 2003 16:02 Edited at: 20th Jun 2003 16:19
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It depends on the the range of characters that you need, or if you're talking a lossy-type compression.

I remember that PsionII's had a method that used 6 bits for each character (giving 64 characters)
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MrTAToad
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Posted: 20th Jun 2003 16:35
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Its not actually for compression - its to remove the need for seaching 64K worth of arrays - its a lot quicker going directly to relevant index than having to do a seach (even if it is two way).

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!
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IanM
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Posted: 21st Jun 2003 00:27
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Try this one:



I've adapted it from a 32 bit algorithm. It seems to give fairly well distributed results in the small sample of works I gave it, but I suspect you'll still need to deal with collisions in your array.
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MrTAToad
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Posted: 21st Jun 2003 01:49 Edited at: 21st Jun 2003 15:39
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Thanks Ian - that'll be very useful for my array plug-in.
As for collisions - if they find two strings use the same structure, then tough - a different name will have to be chosen...

I've converted it to C - works very well.

Good news everyone! I really am THAT good...
http://www.nickk.nildram.co.uk/ for great plug-ins - oh my, yes!
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