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README.md

BaseXX/base62

Pretty good Base62 encoder with customizable encoding alphabet.

Purpose

Base62 is designed to use only alphanumeric characters in opposition of Base64 that requires to use at least two punctuation characters. See https://wikiless.org/wiki/Base62.

Encoding Alphabet

The default encoding alphabet StdEncoding uses the 62 digits and letters in lower and upper cases:

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz

You can also provide your own ASCII alphabet (containing or not punctuation characters).

Comparison with other BaseN

Characters often used by common BaseXX encodings:

Alphanumeric  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
Base62        0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
Base64        0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/=
Base58         123456789ABCDEFGH JKLMN PQRSTUVWXYZabcdefghijk mnopqrstuvwxyz
Hexadecimal   0123456789ABCDEF

Can be much faster

Performance can be much much improved. Using the tips of https://github.com/mtraver/base91 (original work from Joachim Henke), this BaseXX/base92 may become 200 times faster on the encoding, and 30 times faster on the decoding.

Contributions welcome

This Base92 needs your help to become faster. Please propose your enhancements, or even a further refactoring. Any contribution is welcome. ;-)