rom2url

#!/usr/bin/env node
//
// Generates a link from a rom file

const fs = require("fs");
const path = require("path");

if (process.argv.length < 3) {
    console.error("Usage: rom2url ROM");
    process.exit(1);
}

const romBuffer = fs.readFileSync(process.argv[2]);

// Based on https://www.npmjs.com/package/z85
function encodeZ85 (buffer) {
    var extra =  buffer.length % 4;
    if (extra > 0) {
        buffer = Buffer.concat([buffer, Buffer.alloc(4-extra)]);
    }

    var encoder = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-:+=^!/*?&<>()[]{}@%$#".split("");

    var str = "",
        byte_nbr = 0,
        size = buffer.length,
        value = 0;
    while (byte_nbr < size) {
        var characterCode = buffer[byte_nbr++];
        value = (value * 256) + characterCode;
        if ((byte_nbr % 4) == 0) {
            var divisor = 85 * 85 * 85 * 85;
            while (divisor >= 1) {
                var idx = Math.floor(value / divisor) % 85;
                str += encoder[idx];
                divisor /= 85;
            }
            value = 0
        }
    }

    // Prevent % escape sequences
    str = str.replace(/%/g, "%25");

    return str;
}

console.log("https://aduros.com/webuxn/?raw#" + encodeZ85(romBuffer));