for small files this scipt is working fine, but for larger files , its showing as success but the result is a file of 0 bytes.please help to solve this .

#!/usr/bin/perl -wT                                                   
+                                                                     
+                
                                                                      
+                                                                     
+                
use strict;                                                           
+                                                                     
+                
 use CGI;                                                             
+                                                                     
+                
 use CGI::Carp qw ( fatalsToBrowser );                                
+                                                                     
+                
 use File::Basename;                                                  
+                                                                     
+                
                                                                      
+                                                                     
+                
$CGI::POST_MAX = 1024 * 70000;                                        
+                                                                     
+                
 my $safe_filename_characters = "a-zA-Z0-9_.-";                       
+                                                                     
+                
 my $upload_dir = "/var/www/mnt";                                     
+                                                                     
+                
                                                                      
+                                                                     
+                
my $query = new CGI;                                                  
+                                                                     
+                
 my $filename = $query->param("photo");                               
+                                                                     
+                
 my $email_address = $query->param("email_address");                  
+                                                                     
+                
                                                                      
+                                                                     
+                
if ( !$filename )                                                     
+                                                                     
+                
 {                                                                    
+                                                                     
+                
 print $query->header ( );                                            
+                                                                     
+                
 print "There was a problem uploading your photo (try a smaller file).
+";                                                                   
+                
 exit;                                                                
+                                                                     
+                
 }                                                                    
+                                                                     
+                
                                                                      
+                                                                     
+                
my ( $name, $path, $extension ) = fileparse ( $filename, '\..*' );    
+                                                                     
+                
 $filename = $name . $extension;                                      
+                                                                     
+                
 $filename =~ tr/ /_/;                                                
+                                                                     
+                
 $filename =~ s/[^$safe_filename_characters]//g;                      
+                                                                     
+                
                                                                      
+                                                                     
+                
if ( $filename =~ /^([$safe_filename_characters]+)$/ )                
+                                                                     
+                
 {                                                                    
+                                                                     
+                
 $filename = $1;                                                      
+                                                                     
+                
 }                                                                    
+                                                                     
+                
 else                                                                 
+                                                                     
+                
 {                                                                    
+                                                                     
+                
 die "Filename contains invalid characters";                          
+                                                                     
+                
 }                                                                    
+                                                                     
+                
                                                                      
+                                                                     
+                
my $upload_filehandle = $query->upload("photo");                      
+                                                                     
+                
                                                                      
+                                                                     
+                
open ( UPLOADFILE, ">$upload_dir/$filename" ) or die "$!";            
+                                                                     
+                
 binmode UPLOADFILE;                                                  
+                                                                     
+                
                                                                      
+                                                                     
+                
while ( <$upload_filehandle> )                                        
+                                                                     
+                
 {                                                                    
+                                                                     
+                
 print UPLOADFILE;                                                    
+                                                                     
+                
 }                                                                    
+                                                                     
+                
                                                                      
+                                                                     
+                
close UPLOADFILE;                                              
  print $query->header ( );                                           
+                                                                     
+                  
print "<html>";                                                       
+                                                                     
+                
print "<head>";                                                       
+                                                                     
+                
                                                                      
+                                                                     
+                
 print "<meta http-equiv=\"Content-Type\" content=\"text/html; charset
+=utf-8\" />";                                                        
+                
print "<title>Thanks!</title>";                                       
+                                                                     
+                
 print "<style type=\"text/css\">";                                   
+                                                                     
+                
 print 'img {border: none;}';                                         
+                                                                     
+                
 print "</style>";                                                    
+                                                                     
+                
                                                                      
+                                                                     
+                
print "<body>                                                         
+                                                                     
+                
 <p>Thanks for uploading your photo!</p>                              
+                                                                     
+                
 <p>Your email address: $email_address</p>                            
+                                                                     
+                
 <p>Your photo:</p>                                                   
+                                                                     
+                
 <p><img src=\"../mnt/$filename\" alt=\"Photo\" /></p>                
+                                                                     
+                
 </body>                                                              
+                                                                     
+                
 </head>                                                              
+                                                                     
+                
                                                                      
+                                                                     
+                
 </html>";
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