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"Fun" with images

Psudo
stranger

Oct 14, 2001, 11:03 AM

Post #1 of 3 (1140 views)

"Fun" with images	Can't Post

I'm trying to make a program that password-protects images on a webpage my having them a directory higher than that to which the URL points. Seemed simple enough, just grab the data and toss it out, byte by byte. Here's the code I came up with:

#!/perl/bin -w
print "Content-type:image/gif\n\n";
open (GIF,"images/nato.gif");
binmode GIF;
while (sysread(GIF, $buffer, 1)){ print $buffer; }
close GIF;

However, it's only giving me part of the file and it's corrupting what it's giving me, too.

Example:
Program - http://208.186.104.108/temp.pl
Image - http://208.186.104.108/images/nato.gif

What's causing the problems? It seems strait forward enough...

mhx
Enthusiast / Moderator

Oct 14, 2001, 11:38 AM

Post #2 of 3 (1139 views)

Re: "Fun" with images [In reply to]	Can't Post

You need to binmode standard output, too. I had the same problem just yesterday as an ftp download corrupted a bzipped archive. Fortunately I had Perl to s/\r\n/\n/g the file, and when I used exactly that on your corrupted gif, it looked pretty good. Wink

For efficiency reasons, you might prefer the following script that reads/prints the whole file as one big block:

Code

#!/perl/bin -w 
open GIF, 'images/nato.gif' or die "nato.gif: $!\n"; 
binmode GIF; 
binmode STDOUT; 
undef $/; 
print "Content-type:image/gif\n\n", <GIF>; 
close GIF;

Hope this helps.

-- Marcus

Code

s$$ab21b8d15c3d97bd6317286d$;$"=547269736;split'i',join$,,map{chr(($*+= 
($">>=1)&1?-hex:hex)+0140)}/./g;$"=chr$";s;.;\u$&;for@_[0,2];print"@_,"

Psudo
stranger

Oct 15, 2001, 12:02 AM

Post #3 of 3 (1133 views)

THANK YOU! [In reply to]	Can't Post

I've been looking all over for that answer. Bless you with health, happiness, and hoards of hot guys and/or girls (whichever you prefer) hanging over you for the rest of your days!

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