Top Posts Tagged with #vlpack

In "vlpack" I found that "base 1" tallies fell out as a side-effect of using one as the "chunk size", which left no room for anything in the chunk but the continue bit.

In a naive variable length quantity encoding this would require an infinite number of chunks and still never have room for the value, but since vlpack did the next optimization of making the continue bit contribute a +1 to the remaining more significant value bits, the ability to generate the right number of tally marks just emerged as a side-effect in the limit.

#software #vlpack #base 1

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VLPack, VLBack

For years I've had a variable length encoding technique that I call "vlpack" which is

basically just the well-known variable length quantity encoding for unsigned integers,

with the rare but also known improvement of having the continue bit contribute a +1 to the remaining more significant value bits to eliminate redundancy,

with the unique improvement which I've not seen anyone else do where you realize that the prior improvement means you don't need to mask out the continue bit while decoding/unpacking/"vlbacking", and

with conscious recognition that you can choose a "chunk size", which might be smaller or bigger than the native byte or word size, in which case you also have a choice of "sparse" vs "dense" packing.

For now I mostly just want to anchor the terms and gesture at the idea with a post, so that I can start referring to it in other posts.

#software #vlpack #variable length encoding #variable length quantity