[C#] Fooling around with bitwise string encoding

AceInfinity · Jan 18, 2013

Here's a nice example of an encoding "algorithm" for strings that I came up with just 5 minutes ago actually. It works, really well to be honest.

This has not been tested extensively, but this will work for any kind of simple data encoding. I've tested with various Alt characters and that seems to work too.

Code:

//Copyright (c) AceInfinity - Tech.Reboot.Pro
//String bit encoding example

string originalObj = "Let's have ourselves a Fiesta!!!";
Console.WriteLine("Original: {0}", originalObj);
Console.WriteLine("-------------------");

// Encoding

originalObj += "\0";
char* objEncode = stackalloc char[originalObj.Length];
for (int i = 0; i < originalObj.Length; i++)
{
	int j = (int)originalObj ^ (i + 1);
	objEncode = (char)j;
}

string encodedObj = new string(objEncode);
Console.WriteLine("Encoded: {0}", encodedObj);

// Decoding

char* objDecode = stackalloc char[encodedObj.Length];
for (int i = 0; i < encodedObj.Length; i++)
{
	int j = (int)encodedObj ^ (i + 1);
	objDecode = (char)j;
}

string decodedObj = new string(objDecode);
Console.WriteLine("Decoded: {0}", decodedObj);

Result (from original code before I modified the "formula's"):

This snippet has to run in unsafe context. The reason I use (i + 1) is that the first character for both the encoded and decoded values, are the same if we just use i, because I represents an index; the first index is 0, and performing an exclusive or bitwise operation on an integer with 0 has no effect on the original value.

Code:

Console.WriteLine("{0} -> {1}", 10, 10 ^ 0);

Perhaps you could use the reversed index over some constant value as well to get a more unique and refined result.. I'm still trying to see what I can do with this.

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[C#] Fooling around with bitwise string encoding

AceInfinity

Emeritus, Contributor