Converting a GIF Image to Hexadecimal Format

[m0h]

hello there
how can I convert a GIF img to hexadecimal format?
I tryed to use this :

$imgfile = "file.gif";

$tempfile = "$imgfile";

$tempfile = fopen($tempfile, 'r');
$data = fread($tempfile, 1024*1024);
fclose($tempfile);

$Img = bin2hex("$data");

echo "$Img"; 

But its not the right format, please help me A.S.A.P!
thanx

[Paul S]

Maybe you can print each character from $data using the dechex() function,

http://www.php.net/manual/en/function.dechex.php

[Paul S]

m0h, try this code

<?php
 function pauldump($image,$size) {
   if ($fp = fopen($image, 'r')) {
       $data = fread($fp, $size);
       fclose($fp);

       for($i=0;$i<strlen($data);$i++)
            $hex .= dechex(ord($data[$i]));  
   } else
     $hex = "File error";
   return $hex;
 }

  echo pauldump('php4.gif',1024*1024);
?>

[m0h]

Not working here is what I did:

<?php
$tempfile = "Adidsa4.gif";

$tempfile = fopen($tempfile, 'r');
$htmldata = fread($tempfile, 1024*1024);
fclose($tempfile);

echo bin2hex("$htmldata");

echo '<br>';

function pauldump($image,$size) { 
if ($fp = fopen($image, 'r')) { 
$data = fread($fp, $size); 
fclose($fp); 

for($i=0;$i<strlen($data);$i++) 
$hex .= dechex(ord($data[$i])); 
} else 
$hex = "File error"; 
return $hex; 
} 

echo pauldump('Adidsa4.gif',1024*1024); 

?>

here is what i got
my script:
47494638396148000e00f00100000000ffffff21f90400000002002c0000000048000e0000026c8c8f09c9ed0fa334a0ce8b73ac4bfb3f7116486a9c22a25dc92262f78eafb72a6c1cc40b6ee64cdd0a3e8007224d873c354e30cb8ee2843e732321641585fab053aa8f124ace1cb5eef60b2e6bad1b17faac5617334c67955cec46b9e8ec3b04f63794c5f4554835a5845000003b
your script:
474946383961480e0f010000ffffff21f94000202c0000480e0026c8c8f9c9edfa334a0ce8b73ac4bfb3f7116486a9c22a25dc92262f78eafb72a6c1cc4b6ee64cdda3e807224d873c354e30cb8ee2843e732321641585fab053aa8f124ace1cb5eef6b2e6bad1b17faac5617334c67955cec46b9e8ec3b4f63794c5f4554835a58450003b

both are not the right format!

[m0h]

I got the code that do this in PERL
here it is:

-----------------------------------------------
open(F, "myimage.gif") || die $!;
binmode(F);
$s = $hx = "";
while (read(F, $s, 1) > 0) {
$hx .= sprintf("%02X", ord($s));
}
close F;
print "The hex-encoded GIF file is: $hx\n";
-----------------------------------------------

it can also be done using UNIX Command Pipe

-----------------------------------------------
od -v -t x1 myimage.gif | \
sed -e 's/^........//' | \
tr 'a-f' 'A-F' | \
tr -dc '0-9A-F'
-----------------------------------------------

but i need it in php :o)

[Paul S]

Fixed! the problem was the a missing zero.

 function pauldump($image,$size) { 
   if ($fp = fopen($image, 'r')) { 
       $data = fread($fp, $size); 
       fclose($fp); 

       for($i=0;$i<strlen($data);$i++) {
           $a = ord($data[$i]);
           $hex .= ($a <= 15) ? "0".dechex($a) : dechex($a);
       }
    } else 
       $hex = "File error"; 
    return $hex; 
 } 

[seanf]

If you want to use your own error you need to use @:

if ( @ $fp = fopen($image, 'r')) { 

Sean

[Paul S]

Originally posted by m0h
But its not the right format, please help me A.S.A.P!
thanx

Both scripts return the same, I've checked with an HEX editor.

what do you mean by right format?

(Hi seanf )

[seanf]

Originally posted by Paul S
Hi seanf

Hi Paul

Sean