[Resolved] [Resolved] Binary

Bah__Name

Code-Miesters.

Is anyone here good at binary?

I am freading from a binary file as follows

$var = Hex2Dec(Bin2Hex(strrev(fread($fp, 4))))

and modifying $var, then I want to put the data back into the source file in the format in which I took it out, but its not working.

The source file is 8-bit, unsigned little-endian.

When I attempt the inverse of the nested functions that convert the data, what goes back in is wrong.

Explanation:
If I fread() and display from the source file with no conversion, I get gobbledegook in between an occasional readable chunk title.

If I fread() what I put back in, I get the same readable chunk titles but in between them are very clear 1's and 0's, and of course the files are unusable/unrecognised by the software meant to use them.

I'm converting in a way that seems to what makes sense, there just seems to be two kind of binary - human-readable strings("1101") and unreadable gobbledegook. I want the unreadable gobbledegook 🙁

When putting 4 bytes of supposed binary back into the source, what its putting back is way more than 4 bytes, "1101" is apparently 4 bytes.
4 bytes should be more like 11011110 01100101 11100011 10001100.

I'm sure I'm missing something here. Any help would be appreciated.

Stumped,

Bah

laserlight

The function is [man]hexdec/man, so you would use:

$var = hexdec(bin2hex(strrev(fread($fp, 4))))

I dont think there is enough information to help you.
You might need to provide the source file, and the data file, or at least give more comprehensive code snippets of both functions.
I would suggest that you use a hex editor, if you havent already done so.