Encode and Decode routine for BASE 10 Representation in little endian

Question

3.67/5 (3 votes)

See more:

Hello everyone.

I would like help with a simple encode() and decode() function.

I am starting with a byte array, represented as hex, like the following

D4C7E156

and would like to encode this byte array into a BASE 10 representation, in little endian byte order.

If I put the above hex into a calc and convert it to decimal, I get the following

3569869142

Then I would like the decode function to take a string

string input = ("3569869142")

And decode it back into D4C7E156

I know this involves somekind of binary math routine, but I am at a loss.
I would be gratefull for any example code I could work with.

Thank you VERY much

Steve

Posted 24-Feb-11 5:11am

stephen.darling

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Nish Nishant · Answer 1 · 2011-02-24T05:29:00

This should work:

C#

static void Main ()
{
    string input = "D4C7E156";
    string output = Encode(input);
    Console.WriteLine(output);
    string originalInput = Decode(output);
    Console.WriteLine(originalInput);
    Console.WriteLine(input == originalInput);
}

private static string Decode(string output)
{
    Int64 result;
    Int64.TryParse(output, out result);
    return result.ToString("X");
}

private static string Encode(string input)
{
    Int64 result;
    Int64.TryParse(input, NumberStyles.HexNumber,
        CultureInfo.InvariantCulture, out result);
    return result.ToString();
}

OriginalGriff · Answer 2 · 2011-02-24T05:33:00

Solution 2

That's not an encode or decode: all you are doing is changing the number base.
This has nothing to do with big-endian or little-endian: all you are doing is selecting to output a number in base 10 or 16.

Provided your decimal number does not exceed Int64.MaxInt, all you need to do is

C#

Int64 i = 0;
string dec = "3569869142";
string hex = "Input number conversion failed";
if (Int64.TryParse(dec, out i))
    {
    hex = i.ToString("X");
    }
Console.WriteLine(hex);

Posted 24-Feb-11 5:33am

OriginalGriff

Comments

Sandeep Mewara 24-Feb-11 11:50am

Comment from OP:
Provided your decimal number does not exceed Int64.MaxInt, all you need to do is"

This is the problem, I will need large strings of digits upto 50 decimal long.

I found an encode/decode function before and cant seem to find them, and they used bit math to do what I need.

Also, my bigest problem is inputting a text string of digits into the hex value to be converted.

Thank you

Steve