CODEWITHSUNDEEP
javascriptstring
Edin Brodlic
Edin Brodlic

Reputation: 23

What would be a way to parse a string into series of escaped hex characters?

My goal is to handle some incoming string that represents a series of hex byte values and output escaped hex values. I also have the freedom to format the string as I please (add spaces, split into chunks etc).

Example(updated):

var input = "FF655050"; 
var output = "\xFF\x65\x50\x50"; 
console.log(output); //ÿePP

I've had no success with string manipulation (append, replace) and I'm not really sure of my options here. I really want to avoid a gigantic switch case.

Edit: sorry for not specifying the output correctly. I want the actual escaped character(in escaped form), not the string representation.

Upvotes: 1

Views: 89

Answers (3)

adam0101
adam0101

Reputation: 30995

Using a loop:

var input = "FF655050";
var output = "";
for (var i = 1; i < input.length; i+=2) {
  output += String.fromCharCode(parseInt(input[i-1] + input[i], 16));
}
alert(output)

Or using regular expressions:

var input = "FF655050";
var output = input.replace(/.{0,2}/g, function(x){ return String.fromCharCode(parseInt(x, 16)) });
alert(output)

Upvotes: 1

Spencer May
Spencer May

Reputation: 4505

A simple for loop incremented by two should do the trick.

var input = "FF04CA7B";
var output = "";
for (var i=1; i<input.length; i+=2) {
  output += '\\x'+input[i-1]+input[i];
}

Upvotes: 0

Travis J
Travis J

Reputation: 82287

Loop through each set of two and prepend "\x" to it

var input = "FF04CA7B";
var i = 0;
var output = "";
while( i < input.length ){
 output += "\\x" + input[i];
 if(i+1<input.length)output+=input[i+1];
 i+=2;
}
alert(output);

Upvotes: 0

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