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README.md

BaseXX/base92

Pretty good Base92 encoder with customizable encoding alphabet.

Copyright

Copyright (c) 2022 Teal.Finance contributors

This file is part of Teal.Finance/BaseXX licensed under the MIT License. See the LICENSE file or https://opensource.org/licenses/MIT. SPDX-License-Identifier: MIT

Encoding alphabet

The default encoding alphabet StdEncoding complies with the constraints of the cookie tokens: StdEncoding uses 92 characters from 0x20 (space) to 0x7E ~ except ", ; and \.

You can also provide your own customized alphabet with NewEncoding().

Other Base alphabets

In the following example, the Base92 encoding alphabet is not the default one: the space has not been represented => the double-quote " is used to fill the 92nd ASCII character.

Base95  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~ (and space)
Base92  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!"#$%& ()*+,-./:;<=>?@[ ]^_`{|}~
Base91  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!"#$%& ()*+, ./:;<=>?@[ ]^_`{|}~
Ascii85 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstu    z!"#$%&'()*+,-./:;<=>?@[\]^_`
Base64  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz          +   /
Base62  0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
Base58   123456789ABCDEFGH JKLMN PQRSTUVWXYZabcdefghijk mnopqrstuvwxyz
Hexa    0123456789ABCDEF

ASCII order:

(space)!"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~(del)

Similar Base92 project

Currently (May 2022), there are only two Base92 implementations in Go: https://pkg.go.dev/search?q=base92

This BaseXX/base92 has similar performance than smartgo/base92 for large input data, but faster for short samples.

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. ;-)