critbit
case-insensitive
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| critbit | case-insensitive | |
|---|---|---|
| 3 | - | |
| 330 | 24 | |
| - | - | |
| 0.0 | 0.0 | |
| over 2 years ago | almost 2 years ago | |
| C | Haskell | |
| - | BSD 3-clause "New" or "Revised" License |
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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)
case-insensitive
We haven't tracked posts mentioning case-insensitive yet.
Tracking mentions began in Dec 2020.
What are some alternatives?
flatbuffers - An implementation of the flatbuffers protocol in Haskell.
binary - Efficient, pure binary serialisation using ByteStrings in Haskell.
tables - Deprecated because of
jump - Jump start your Haskell development
rethink-app - DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
massiv - Efficient Haskell Arrays featuring Parallel computation
semantic-source - Parsing, analyzing, and comparing source code across many languages
text - Haskell library for space- and time-efficient operations over Unicode text.
nextstep-plist - Parser and printer for NextStep style plist files
Frames - Data frames for tabular data.
data-treify - Reify a recursive data structure into an explicit graph.
refined - Refinement types with static checking