A collection of high performance c-string transformations

http://code.google.com/p/stringencoders/

by skorks • 16 years ago

53 10 16 years ago

code.google.com

I've been looking for a high performance toupper lately too.

Groxx• 16 years ago

Does it have UTF / other format support? I really have no use if it doesn't, and I don't see anything mentioning it on the first page.

mbreese• 16 years ago

Since it is doing bit manipulation, then probably not. I mean, the toupper function is treating (4) 8 bit chars as one 32 bit uint. Then doing math... so, I assume that it will miss the finer points of I18N.

However, the base64/85 en/decoders should work just fine.

jws• 16 years ago

And in the same vein as the nginx optimizations suggested in a comment yesterday, it fails on arcitectures that don't support unaligned access.

klodolph• 16 years ago

This was my question, so I looked at the source. It refers to a page on algorithms that claims that it is 8-bit clean, i.e., it preserves non-ascii characters but does not modify them. I then compiled a test program to verify this, because the bit twiddling in the source code looks a little nuanced. It IS 8-bit clean.

Although, if you're looking for something that converts non-ascii characters to their lower case equivalents, just use LibICU. This library looks nice for decoding things like HTTP which have plenty of ascii-only case insensitivity.

malkia• 16 years ago

Funny, but typing CString in google reveals some new interesting products.

DrJokepu• 16 years ago

Great stuff, it's a shame it doesn't work on Windows (yet). Makes me want to spend the rest of my day trying to port it to MSVC.

sid0• 16 years ago

Surely if stdint is all that's missing, http://code.google.com/p/msinttypes/ will work?

halostatue• 16 years ago

We use http://www.azillionmonkeys.com/qed/pstdint.h in house.

shin_lao• 16 years ago

You can use <boost/cstdint.hpp> http://www.boost.org/

A collection of high performance c-string transformations

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