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critbit | tables | |
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3 | 1 | |
330 | 78 | |
- | - | |
0.0 | 0.0 | |
over 2 years ago | over 8 years ago | |
C | Haskell | |
- | BSD 3-clause "New" or "Revised" License |
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For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
critbit
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Ask HN: What are some 'cool' but obscure data structures you know about?
> Good use-case: routing. Say you have a list of 1 million IPs that are [deny listed].
Apparently, bloom filters make for lousy IP membership checks, read: https://blog.cloudflare.com/when-bloom-filters-dont-bloom/
CritBit Trie [0] and possibly Allotment Routing Table (ART) are better suited for IPs.
[0] https://github.com/agl/critbit
[1] https://web.archive.org/web/20210720162224/https://www.harig...
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Rethink-app: DNS over HTTPS, firewall, and connection tracker for Android
developer here
I'd imagine the app should work over IPv6-only networks thanks to 464xlat. I may be wrong, because I've never tested it on a IPv6-only network.
The reason for IPv6 is two fold:
1. Firewall today simply stores classless IP address rules as strings in a sqlite table fronted by a lfu cache backed by a typical hash-map. With IPv6, I'd imagine, this won't scale. So, we need a more economical in-memory data-structure (like a crit-bit trie [0] or art tree).
2. Apparently LwIP has problems with HappyEyeballs (I personally never saw it, but got a couple of reports from users about it that it was an unrecoverable error once the connectivity was lost, and the firewall had to be restarted). We're in the process of replacing LwIP with gvisor/netstack now [2], just to get IPv6 support back on track.
[0] https://github.com/agl/critbit
[1] http://www.hariguchi.org/art/art.pdf
[2] https://github.com/celzero/firestack/issues/3
- Critbit Trees in C(WEB)
tables
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New Pandas-for-Haskell data frame library: Name suggestions
Similar existing libraries: tables (Data.Table) and Frames (Frames.Frame).
What are some alternatives?
flatbuffers - An implementation of the flatbuffers protocol in Haskell.
stringtable-atom - [Haskell] Memoize Strings as Atoms for fast comparison and sorting, with maps and sets
rethink-app - DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
hierarchy
semantic-source - Parsing, analyzing, and comparing source code across many languages
JuPyTer-notebook - JuPyTer notebook parser
nextstep-plist - Parser and printer for NextStep style plist files
gps2htmlReport - Generates a HTML page report detailing a GPS journey, with charts, statistics and an OpenStreetMap graphic.
data-treify - Reify a recursive data structure into an explicit graph.
FixedPoint-simple - A library of large (fixed size) ints, words, and fixed point numbers.
dependent-map - Dependently-typed finite maps (partial dependent products)
hebrew-time - Hebrew dates and prayer times.