Basa256 encoder / decoder

b256.ts

// A simple way to store binary data inside a js/ts file with a density of 1 char per byte.
// Even though each char takes 2 bytes.

const b256enc = (buff: Uint8Array) => [...buff].map(i => String.fromCodePoint(i + 192)).join('');
const b256dec = (str: string) => str.split('').map(c => c.charCodeAt(0) - 192);

// Example 1: Basic usage
const data = new Uint8Array([ 127, 127, 168, 226, 120, 62, 44, 146, 82, 213, 0, 30 ]);
const encoded = b256enc(data);
console.log(encoded); // 'ĿĿŨƢĸþìŒĒƕÀÞ'

const decoded = b256dec(encoded);
console.log(decoded); // (12) [127, 127, 168, 226, 120, 62, 44, 146, 82, 213, 0, 30]


// Example 2 - Inline 4kb data
// Before: 5 chars per byte
const data = new Uint8Array([ 127, 127, 168, 226, 120, '...more data...', 62, 44, 146, 82, 213, 0, 30 ]);
// After: 1 char per byte
const data = new Uint8Array('ĿĿŨƢĸþ...more data...ìŒĒƕÀÞ'.split('').map(c => c.charCodeAt(0) - 192));

Comparison table for 1024bytes of binary data:

	Chars	File bytes
Not encoded	5120	5120
Base64	1366	1366	Until native Uint8Array.fromBase64() we need to implement a decoder like this
Base256	1024	2048	Simple decoder, Requires utf8 IDE.

---

const notEncoded = [ 127, 127, 168, 226, 120, 62, 44, 146, 82, ……, 213, 0, 30 ];
const base64data = 'f3+o4ng+LJJS……1YCA';
const base256dat = 'ĿĿŨƢĸþìŒĒ……ƕÀÞ';