Help with fwrite + pack

[aquadeluxe]

I'm having trouble with this code.

 

<?php
$path_to_file = "file_e.bin";

$fp = fopen($path_to_file, "w+b");
fseek($fp, 0x103, SEEK_SET);
fwrite($fp, pack('H*', '6E'));
fclose($fp);

?>

 

What is happening is the file is normally a very long file, but it then just gets truncated to 0x103, and all the hex before 0x103 gets turned into 00. Does anyone have a solution?

[aquadeluxe]

bump

[MadTechie]

You have stated what happens but not what you expect..

from looking at the code i assume you didn't expect the zeros

change

fwrite($fp, pack('H*', '6E'));

should be

fwrite($fp, pack('H*', 6E));

 

also

$fp = fopen($path_to_file, "w+b");

should be

$fp = fopen($path_to_file, "r+");

 

[aquadeluxe]

I want to just change the 0x103 offset and keep all of the other bytes in tack.

 

When I change from w+b to r+ without changing the pack statement, it then returns the whole file, but 0x103 is still in it's original form. When I change omit the single quotes on 6E, it just gives a T_STRING error.

[MadTechie]

try 0x6E