csauve/unicode-hide.js

## unicode-hide.js
var TextEncoder = require("text-encoding").TextEncoder;
var TextDecoder = require("text-encoding").TextDecoder;

var jsSource = "";
process.stdin.resume();
process.stdin.on("data", function(buf) {
  jsSource += buf.toString();
});

process.stdin.on("end", function() {
  var encoded = encode(jsSource);
  var decoded = decodeLite(encoded);
  console.log(encoded);

  if (decoded != jsSource) {
    console.error("Mismatch detected. Try a different source.");
    console.log(decoded);
  } else {
    console.log("Success!");
  }
});


function encode(source) {
  var inputBuffer = TextEncoder("utf-8").encode(source);
  var outputBuffer = new Uint8Array(Math.ceil(inputBuffer.byteLength * 3 / 2));

  for (var i = 0, j=0; i < Math.ceil(inputBuffer.byteLength/2)*2;) {
    var b1 = inputBuffer[i++];
    var b2 = inputBuffer[i++];

    outputBuffer[j++] = 0b11100000 | b1 >> 4
    outputBuffer[j++] = 0b10000000 | (b1 & 0b1111) << 2 | b2 >> 6
    outputBuffer[j++] = 0b10000000 | (b2 & 0b111111)
  }

  return TextDecoder("utf-8").decode(outputBuffer);
}

function decode(encoded) {
  var inputBuffer = TextEncoder("utf-8").encode(encoded);
  var outputBuffer = new Uint8Array(inputBuffer.byteLength * 2 / 3);

  for (var i = 0, j=0; i < inputBuffer.byteLength;) {
    var b1 = inputBuffer[i++];
    var b2 = inputBuffer[i++];
    var b3 = inputBuffer[i++];

    outputBuffer[j++] = (b1 & 0b1111) << 4 | (b2 & 0b111111) >> 2;
    outputBuffer[j++] = b2 << 6 | (b3 & 0b111111);
  }

  return TextDecoder("utf-8").decode(outputBuffer);
}

function decodeLite(e) {
  b=TextEncoder().encode(e);
  o=new Uint8Array(b.length*2/3);

  for (i=j=0;i<b.length;){o[j++]=(b[i++]&15)<<4|((y=b[i++])&63)>>2;o[j++]=y<<6|(b[i++]&63);}

  return TextDecoder().decode(o);
}

/* Browser version:

data:text/html,<body onload='b=new TextEncoder().encode(decodeURIComponent(location.hash.slice(1)));o=new Uint8Array(b.length*2/3);for(i=j=0;i<b.length;){o[j++]=(b[i++]&15)<<4|((y=b[i++])&63)>>2;o[j++]=y<<6|(b[i++]&63);}eval(new TextDecoder().decode(o))'>#摯捵浥湴⹢潤礮楮湥版呍䰠㴠≨敬汯Ⱐ睯牬搡∻

*/
	var TextEncoder = require("text-encoding").TextEncoder;
	var TextDecoder = require("text-encoding").TextDecoder;

	var jsSource = "";
	process.stdin.resume();
	process.stdin.on("data", function(buf) {
	jsSource += buf.toString();
	});

	process.stdin.on("end", function() {
	var encoded = encode(jsSource);
	var decoded = decodeLite(encoded);
	console.log(encoded);

	if (decoded != jsSource) {
	console.error("Mismatch detected. Try a different source.");
	console.log(decoded);
	} else {
	console.log("Success!");
	}
	});


	function encode(source) {
	var inputBuffer = TextEncoder("utf-8").encode(source);
	var outputBuffer = new Uint8Array(Math.ceil(inputBuffer.byteLength * 3 / 2));

	for (var i = 0, j=0; i < Math.ceil(inputBuffer.byteLength/2)*2;) {
	var b1 = inputBuffer[i++];
	var b2 = inputBuffer[i++];

	outputBuffer[j++] = 0b11100000 \| b1 >> 4
	outputBuffer[j++] = 0b10000000 \| (b1 & 0b1111) << 2 \| b2 >> 6
	outputBuffer[j++] = 0b10000000 \| (b2 & 0b111111)
	}

	return TextDecoder("utf-8").decode(outputBuffer);
	}

	function decode(encoded) {
	var inputBuffer = TextEncoder("utf-8").encode(encoded);
	var outputBuffer = new Uint8Array(inputBuffer.byteLength * 2 / 3);

	for (var i = 0, j=0; i < inputBuffer.byteLength;) {
	var b1 = inputBuffer[i++];
	var b2 = inputBuffer[i++];
	var b3 = inputBuffer[i++];

	outputBuffer[j++] = (b1 & 0b1111) << 4 \| (b2 & 0b111111) >> 2;
	outputBuffer[j++] = b2 << 6 \| (b3 & 0b111111);
	}

	return TextDecoder("utf-8").decode(outputBuffer);
	}

	function decodeLite(e) {
	b=TextEncoder().encode(e);
	o=new Uint8Array(b.length*2/3);

	for (i=j=0;i<b.length;){o[j++]=(b[i++]&15)<<4\|((y=b[i++])&63)>>2;o[j++]=y<<6\|(b[i++]&63);}

	return TextDecoder().decode(o);
	}

	/* Browser version:

	data:text/html,<body onload='b=new TextEncoder().encode(decodeURIComponent(location.hash.slice(1)));o=new Uint8Array(b.length*2/3);for(i=j=0;i<b.length;){o[j++]=(b[i++]&15)<<4\|((y=b[i++])&63)>>2;o[j++]=y<<6\|(b[i++]&63);}eval(new TextDecoder().decode(o))'>#摯捵浥湴⹢潤礮楮湥版呍䰠㴠≨敬汯Ⱐ睯牬搡∻

	*/