Unicode and Punycode Domain Name Processing

Provides high-performance functions for processing internationalized domain names, split across two tiers.

Details

The package exposes two distinct surfaces, deliberately kept separate:

• A **low-level Punycode codec** ([puny_encode()] / [puny_decode()]): the raw RFC 3492 transform with `xn–` A-label framing (RFC 5890/5891) and letter-digit-hyphen checks. It performs no Unicode normalization.

• An **IDNA/UTS-46 host-normalization surface** ([host_normalize()]): Unicode NFC, UTS #46 mapping and validation, and conversion to a canonical lowercase ASCII comparison form under a pinned profile.

Use the codec when you need the literal ASCII-Compatible Encoding of a label; use [host_normalize()] when you need a standards-profiled comparison form for a host name.

See also

Useful links:

• https://github.com/bart-turczynski/punycoder

• https://CRAN.R-project.org/package=punycoder

• Report bugs at https://github.com/bart-turczynski/punycoder/issues

Author

Maintainer: Bart Turczynski bartek+punycoder@turczynski.pl

Authors:

• Bart Turczynski bartek+punycoder@turczynski.pl