XD is just a meme software, aiming to get me off some of the boredom surrounding me at the time I wrote it. However, instead of being trash, it's a pretty cool demonstration of how a cool and pretty performant data encoder could work.
As a quick disclaimer, I have never seen how things like base64 work, but I just assumed it could be something like this, although I'm probably, at least, 65% wrong. Whatever the case is, just have fun.
There are two sections which, at the same time, are divided by two separate containers.
Each time a compatible event fires on #Edecoded (such as keyup, keydown or change), its whole .val() is read.
Then, this value gets temporarily stored into a local variable which is used to iterate through the available characters. A new variable is defined, which will contain the rendered values. Whenever a new character appears, the render will push a new X, and then, continuously iterate from 1 (because we already have the initial X) to the index of the character in the ASCII table, this process, concatenates a D on each run.
Once completed, the result is copied back to the page, in the value of #Eencoded.
For each compatible event that fires up on #Dencoded (such as keyup, keydown or change), its whole .val() is read.
If the value includes at least an X and a D, the program will iterate through each character. A container for the result is defined, and an accumulator is incremented each time this process occurs and, as such, whenever another X is found its value will be reset. During the reset operation, the current value within the accumulator will be used to decode an ASCII character by calling String.fromCharCode(code).
Once the loop is done, the result of the concatenation done within it, will be copied back to the browser, in the value of #Ddecoded.
It's worth noting that, although the decoding process is pretty straightforward, there's a small issue due to how the data is encoded, and it's that it becomes kinda hard to programatically understand the first entry, mainly if there's only one. A small workaround has been applied that will increase the accumulator by one if either of the previously noted cases occurs.
This software has been licensed under the MIT license.