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Archives produced with it should remain compatible with DOS versions (except for 2GB+ files of course). I even got it to work with Total Commander as a drop-in replacement for the executable. Repo & Binaries: github.com/klauspost/uc2

github.com

GitHub - klauspost/uc2: Go port of Ultra Compressor 2 - modernized

Go port of Ultra Compressor 2 - modernized. Contribute to klauspost/uc2 development by creating an account on GitHub.

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Klaus Post @klauspost.com · 14h

So with an LLM I ported the original Borland to #golang. I tried to make it usable in a modern context, adding utf-8 and 64 bit sizes as an extension. I have cross-compiled binaries for more than 30 platforms.

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Klaus Post @klauspost.com · 14h

Back in the day Ultra Compressor II (DOS) trickled my interest in compression and data recovery as I was learning about computers. With the knowledge I have now, it was fascinating to look through it with an LLM and also quite nostalgic re-creating the UI I only vaguely remember.

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Klaus Post @klauspost.com · 28/09/2026

zstd speedups contributed by @lizthegrey.com / @honeycomb.io - with more to come! 👀

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Klaus Post @klauspost.com · 28/09/2026

zstd decompression speed... (each level decompression speed)

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Klaus Post @klauspost.com · 28/09/2026

Working on a #golang compression benchmark comparison site. Deflate speed improvements from latest compression library release... (JSON stream)

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Klaus Post @klauspost.com · 27/09/2026

New #golang compression release with a lot of good vibes.

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Klaus Post @klauspost.com · 18/09/2026

Why is #golang now a non-deterministic language with the 1.27 FMA changes? Pure Go code producing different output on different platforms. Avoiding that is why I *moved* to Go.

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Klaus Post @klauspost.com · 09/09/2026

My Ad Blocker.. is now showing ads. What a timeline to live in!

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Klaus Post @klauspost.com · 25/08/2026

Yeah, it always requires an extra mental step to read min/max for me. Like half a second. But I still see plenty of mistakes - though LLMs do get them right and spots the mistake, so maybe a disappearing problem.

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Klaus Post @klauspost.com · 25/08/2026

Must be the MP4/21. Had forgotten that Kimi raced in the chrome McLaren in 2006. Beautiful car!

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Klaus Post @klauspost.com · 18/08/2026

Lastpass Chrome Extension still not triggering.

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Klaus Post @klauspost.com · 14/08/2026

Amazing! Thanks for the great work! I know how hard these are to get out when you are on the edge of a new release.

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Klaus Post @klauspost.com · 14/08/2026

Just 2381 more bytes and we are good to release :D

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Klaus Post @klauspost.com · 10/08/2026

You mean management isn't responsible for what happens to the product?

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Klaus Post @klauspost.com · 10/08/2026

So you are blaming bad management decisions on LLMs? Seems a bit early for that.

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Reposted by Klaus Post

GoLab Conference @golab.io · 22/07/2026

🗜️ Compression is all about trade-offs. Smaller payloads, lower bandwidth, faster transfers... but at what cost in CPU, memory, and compatibility? At #GoLab2026, Klaus Post will guide you through the compression landscape in Go and help you choose the right tool for the job golab.io/talks/go-dat...

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Klaus Post @klauspost.com · 17/07/2026

Search Compressed Data for byte sequences with selective decompression using MinLZ v1.2.0 - available as cli and #golang API. Overhead is a fractional bit per byte, fully customizable and with fixed specification.

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Klaus Post @klauspost.com · 09/07/2026

Ported "Radsort — a stable LSD radix sort with O(√n) space overhead" by Robert Clausecker and Florian Schintke to #golang. Good, specialized sorting for big arrays of dense keys (uint64, etc). github.com/klauspost/ra...

github.com

GitHub - klauspost/radsort

Contribute to klauspost/radsort development by creating an account on GitHub.

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Klaus Post @klauspost.com · 02/07/2026

Yeah. The timings on uops.info were a bit too hazy for me to get an understanding, which is why I was mainly interested in benches. It does look like a free lunch. Nice!

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Klaus Post @klauspost.com · 02/07/2026

Looking at uops timings it doesn't look equal, though. Are you seeing any speed changes?

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Klaus Post @klauspost.com · 01/07/2026

New #golang compression release. Big features include #zstd concurrent stream encoding, arm64 decompression assembly and various minor changes.

What's Changed
zstd: Add true concurrent stream encoding by @klauspost in #1136
zstd: arm64 decoder asm by @lizthegrey in #1160
zstd: avoid unused BuildDict encoder allocation by @snissn in #1147
flate: Add inflate checkpoints by @klauspost in #1154
snappy/s2: Limit length of varint in decodedLen by @eustas in #1148
gzhttp: match qvalue parameter case-insensitively (RFC 7231) by @z9z in #1149
zip: add NameDecoder callback for legacy encoding rewrite by @SAY-5 in #1150
huff0: Allow building tables from histogram. by @klauspost in #1155
huff0: Allow building table from oversized histogram. by @klauspost in #1156
s2sx: Clean symlink targets by @klauspost in #1163

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Klaus Post @klauspost.com · 19/06/2026

Very much looking forward to this one!

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Klaus Post @klauspost.com · 19/05/2026

I must say the ability to test out ideas in less than an hour is so addictive. Also I feel much less "attached" to idea and it is much easier to abandon if it doesn't pan out.

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Klaus Post @klauspost.com · 14/05/2026

Very excited to be back at @golab.io - super chill and well organised event! I will give a talk on the state of #golang data compression. See you there!

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Klaus Post @klauspost.com · 29/04/2026

Yes, OSS is seeing the flood right now because it is low-hanging. But OSS has prepared for it for decades. The "binary distributed" flood will be SO much worse. Don't want to think about device drivers, but just winword.exe seems a big enough target.

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Klaus Post @klauspost.com · 20/04/2026

Still amazed me that sometimes you can just stumble across a change that gives 200% speed.

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Klaus Post @klauspost.com · 15/04/2026

(Wikipedia is not very helpful on this). But it seems it would trap and the OS/runtime/compiler would provide a software version to run the instruction. Neat, though probably not too practical if ISA adds registers. I see RISC-V adopted it as well.

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Klaus Post @klauspost.com · 14/04/2026

Using IV for data was 🤌 I get all of the *why* - it is just so restrictive and boring. So putting a wrench in the machine is a great break.

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Klaus Post @klauspost.com · 26/03/2026

Not an expert, but it seems to use optimistic (single threaded) boost clock for the (multithreaded) rate/GHz which clearly mismatches. A rate/W would make more sense, but you'd have to measure since TDP is given differently per vendor.

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Klaus Post @klauspost.com · 09/03/2026

Aren't you also posting them here? What am I "missing"?

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Klaus Post @klauspost.com · 13/02/2026

My own approach for repos I don't intend to maintain is to archive, and when available link the fork on top of the README. Seems fair to all involved.

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Klaus Post @klauspost.com · 09/02/2026

An http . HandlerFunc implements http . Handler - so you are getting a Handler back as well. If you need to convert the function type it should be trivial.

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Klaus Post @klauspost.com · 09/02/2026

Maybe there will be cake if you fix it? ;)

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Klaus Post @klauspost.com · 09/02/2026

New v1.18.4 release of #golang compression library adds zstd compression to gzhttp middleware. Also zstd can now have some options modified on reset. See more at: github.com/klauspost/co...

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Klaus Post @klauspost.com · 06/02/2026

Cool! But can't help notice it gets darker instead of more 'grey' with distance. GL HF with your game!

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Klaus Post @klauspost.com · 05/02/2026

Well, hello there follow GenX'er.

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Klaus Post @klauspost.com · 23/01/2026

I actually thinks it is under-selling the readability gains from this. Interfaces are "interesting" - and probably the only non-obvious aspect.

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Klaus Post @klauspost.com · 13/01/2026

Wish there was a way to regression tests. If you do a PR and are willing to do followups we could guineapig on my compress/zip - after all it has a higher release schedule. That is probably the best I can offer to make it smooth into the stdlib.

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Klaus Post @klauspost.com · 13/01/2026

You are brave ;) So many implementations out there - always worried that a random Java implementation will break. But thanks for taking it on! <3

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Klaus Post @klauspost.com · 13/01/2026

Slightly different approach: github.com/minio/zipindex It will parse the EOCD and allow keeping a compact index so individual files can be read with a single RANGE get. Allows servers to list/serve files within a zip instantly.

github.com

GitHub - minio/zipindex: Package for indexing zip files and storing a compressed index

Package for indexing zip files and storing a compressed index - minio/zipindex

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