How to encode / decode ascii85 in javascript

Question

I was looking for an alternative to Base64 that works fine with Unicode characters. I found ASCII85 that works fine, but I did not find code or commands that execute this in JS .

I just found this link , which does not work for international characters and does not include the decoding function.

There is an online decoder / encoder .

I even found C codes that does this (I don’t have enough information to process JS data for conversion).

And some codes that I don’t know how to work.

I heard that JQuery supports Base64 , but it seems that it does not support ASCII85 .

Does anyone know about ASCII85 in JS that might help?

thanks

Answer 1

using dojo.js framework:

Decoding example + source

Encoding Example + Source

ascii85 Encoding using

Summary:

 dojo.require("dojox.encoding.ascii85"); var dc = dojox.encoding var buf = dc.ascii85.decode("") var a85 = dc.ascii85.encode(""); 

Answer 2

Pure JavaScript Ascii85 AKA Base85 Encoding / Decoding Features:

 function encode_ascii85(a) { var b, c, d, e, f, g, h, i, j, k; for (!/[^\x00-\xFF]/.test(a), b = "\x00\x00\x00\x00".slice(a.length % 4 || 4), a += b, c = [], d = 0, e = a.length; e > d; d += 4) f = (a.charCodeAt(d) << 24) + (a.charCodeAt(d + 1) << 16) + (a.charCodeAt(d + 2) << 8) + a.charCodeAt(d + 3), 0 !== f ? (k = f % 85, f = (f - k) / 85, j = f % 85, f = (f - j) / 85, i = f % 85, f = (f - i) / 85, h = f % 85, f = (f - h) / 85, g = f % 85, c.push(g + 33, h + 33, i + 33, j + 33, k + 33)) :c.push(122); return function(a, b) { for (var c = b; c > 0; c--) a.pop(); }(c, b.length), "<~" + String.fromCharCode.apply(String, c) + "~>"; } function decode_ascii85(a) { var c, d, e, f, g, h = String, l = "length", w = 255, x = "charCodeAt", y = "slice", z = "replace"; for ("<~" === a[y](0, 2) && "~>" === a[y](-2), a = a[y](2, -2)[z](/\s/g, "")[z]("z", "!!!!!"), c = "uuuuu"[y](a[l] % 5 || 5), a += c, e = [], f = 0, g = a[l]; g > f; f += 5) d = 52200625 * (a[x](f) - 33) + 614125 * (a[x](f + 1) - 33) + 7225 * (a[x](f + 2) - 33) + 85 * (a[x](f + 3) - 33) + (a[x](f + 4) - 33), e.push(w & d >> 24, w & d >> 16, w & d >> 8, w & d); return function(a, b) { for (var c = b; c > 0; c--) a.pop(); }(e, c[l]), h.fromCharCode.apply(h, e); } var myString='This is a test!'; var encoded=encode_ascii85(myString); var decoded=decode_ascii85(encoded); document.write(decoded); 

Answer 3

You can use my JavaScript implementation ASCII85 (Base85) , which can work with both byte arrays and strings