neopallium

il y a 3 ansdiscuss

I needed to get the PPPoE account off a router once (My boss didn't remember the router's admin password), so I connected the WAN port to my laptop and captured the PPPoE packets. I might have had to use a second ethernet port (USB hub with eth port) to allow the old router to talk to the telcom modem. Just bridge the two ports and capture the traffic.

neopallium

il y a 3 ansdiscuss

Create a StackOverflow + GPT site where questions can be asked in public with both human and AI answers. Make it clear to users that the content will be used in future training sets.

neopallium

il y a 3 ansdiscuss

I used c2rust to start rewriting OpenJpeg into Rust code [0].

It was easy to get the Rust code compiled and working as a drop-in-replacement for the C Library. This has been a big help with refactoring the unsafe Rust code into safe Rust (manual work). OpenJpeg has a great testsuite that has allowed testing that each refactor step doesn't add new bugs (has happened at least 3 times).

The original run of c2rust generated 96,842 lines of Rust code (about 1 year ago), now it is down to 46,873 lines code. A lot of the extra 50k lines of code were from C macros that got expanded and from constant lookup tables (C code had 10-30 values per line, Rust 1 value 1 line).

For anyone looking to use c2rust to port C code to Rust, I recommend the following:

  1. Setup some automated testing if it doesn't exist already.
  2. Do refactoring in small amounts, run the tests and commit the changes before doing more refactoring.
  3. Use "search/replace" tools (`sed`) to help with rewriting common patterns.  Make sure to follow #2 when doing this.
  4. Don't re-organize the code until after most of the unsafe code has been rewritten.  This will allow easier side-by-side comparison with the original C code.
  5. c2rust expands macros and constants from `#define`.  Being able to do side-by-side comparison of the C code will help with adding constants back in and removing expanded code with Rust macros or just normal Rust functions.

[0] https://github.com/Neopallium/openjpeg/tree/master/openjp2-r...

neopallium

il y a 4 ansdiscuss

Would it be possible to build a rosetta stone for this secret language with prompts asking for labeled pictures of different categories of objects? Or prompts about teaching kids different words?

neopallium

il y a 4 ansdiscuss

A motion activated sprinkler could work too. Or buy a motion detector and have it activate plant water sprayers (the kind used for automatic watering of potted plants).

neopallium

il y a 4 ansdiscuss

If both Humble and Webb were pointed at the same spot of the sky at the same time, the images could be merged to get a wider range of the light spectrum.

neopallium

il y a 4 ansdiscuss

I just started using c2rust on openjpeg [0] (jpeg 2000 encoder/decoder) today and already have it working as a drop in replacement for the C libopenjp2.so on Linux. Still has a lot of unsafe code, but it does work. Which will be a big help with testing during refactoring to idiomatic safe Rust.

c2rust also has a refactor command that helps with refactoring the generated Rust code.

[0] https://github.com/Neopallium/openjpeg/tree/c2rust

neopallium

il y a 6 ansdiscuss

The Rust compiler can auto-vectorize loop code.

This blog post shows how to write simple idiomatic Rust code that will allow the compiler to auto-vectorize:

http://cliffle.com/p/dangerust/6/

neopallium

il y a 6 ansdiscuss

Someone wrote a 6 part of blog post [0] about porting that nbody benchmark from C to Rust. They went from a straight line by line port using unsafe rust using the same SSE based design to clean no-unsafe and no SSE rust code that was faster then the original C code with hand optimized SSE.

It is a great example of how the Rust compiler can auto-vectorize code.

0. http://cliffle.com/p/dangerust/6/

neopallium

il y a 6 ansdiscuss

FastCGI doesn't set environment variables. Only CGI does that since the CGI binary is executed for each request. FastCGI binaries run as a server listening on a unix/tcp socket for connections from the frontend web server. It works the like a webapp listening for http requests on a local socket with reverse http proxy rules setup on the frontend web server.

neopallium

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