Package Exports
- escape64
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (escape64) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
#escape64
Intro
Using standard Base64 in URLs requires encoding of +, / and = characters into special percent-encoded hexadecimal sequences (+ becomes %2B, / becomes %2F and = becomes %3D), which makes the string unnecessarily longer.
For this reason, modified Base64 for URL variants exist, where the + and / characters of standard Base64 are respectively replaced by - and _, so that using URL encoders/decoders are no longer necessary and have no impact on the length of the encoded value
Both above solutions lack a very usefull property for URLs. Double Click mouse selection!
Definition
Escape64 is a variable length variant of Base64 that solves this in a intiutive way._ is used as an escape character and we define the following escape sequences
__ beginging of an Escape64 sequence (optional)
_p encodes a (+) of Base64
_d encodes a (/) of Base64
_q encodes a (=) pad character of Base64
_b marks breaks inside an Escape64 sequence (optional)
_* Reserved. Where (*) can be any char not expicitly mentioned above. Example Implementation
var x = 'asdf+ff/f+ff/dd+ddAd=='; //base64 value
var y = x.replace(/[+]/g,'_p').replace(/[\/]/g,'_d').replace(/[=]/g,'_q');//escape64 value encode
var z = y.replace(/_p/g,'+').replace(/_d/g,'/').replace(/_q/g,'='); //escape64 value decode
console.log(x, y, z);
console.log(z);
console.log(x==z);