I have a project that uses a socket server (php) to gather data from a remote device. It got put on the back burner for a few months and now it's back in play. What I'm wondering is how can I make this program run directly on the stream instead of first having the server write to a tmp file then running this script on that file then writing out a csv file for insertion into a database? Here's what I have so far ( I wind up with two tmp files after this is run):

#vim set sw=2 ts=2
#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
&convert;

#open the source file, strip out any unneeded chars, reformat the data
sub convert{
  my $source = "$ARGV[0]";
  my $dest = "$ARGV[0]"."_tmp.txt";
  chomp $source;
  open SOURCE, '<', $source or die "Cannot open '$source' $!";
  open DEST, '>', $dest or die "Could not open '$dest' $!";

# move the data from the source file into an array
  my %fields;
  my @field_names = qw/FIELD1 FIELD2 FIELD3 FIELD4 FIELD5 FIELD6/;
  my $pack_definition = 'a4 a2 a1 a4 a4 a8A*'; 
  while(<SOURCE>){

    # strip out the packet header 
    s#T18##g;
    s#T00##g;
    s/^(FF14).*$//g;
    s/^(FF18).*$//g;
    s/(^|\n)[\n\s]*/$1/g;

    # arrange the data into the necessary order
    @fields{@field_names} = unpack($pack_definition, $_);
    s#(FF15)(.{2})(.{1})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2
+})#$1\t$2\t$3\t$5$4\t$7$6\t$11$10$9$8#g;
    s#(FF16)(.{2})(.{1})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2})(.{2
+})#$1\t$2\t$3\t$4\t$5\t$6\t$7\t$8\t$9\t$10\t$11#g;
    s#(FF17)(.{2})(.{1})(.{2})(.{2})(.{2})(.{2})(.{4})(.{4})#$1\t$2\t$
+3\t$5$4\t$7$6\t$8\t$9#g;
    my @spds =  /(FF15)\t(.{2})\t(.{1})\t(.{4})\t(.{4})\t(.{8})/;

    # convert the data from hex to ascii
    foreach my $data (@spds){
      my $replacement = hex($data);  
      s#$data#$replacement#g;
    }
    my @psis = /(FF16)\t(.{2})\t(.{1})\t(.{2})\t(.{2})\t(.{2})\t(.{2})
+\t(.{2})\t(.{2})\t(.{2})\t(.{2})/;
    foreach my $data1(@psis){
      my $replacement1 = hex($data1);
      s#$data1#$replacement1#g;
    }
    my @rates=  /(FF17)\t(.{2})\t(.{1})\t(.{4})\t(.{1,4})\t(.{4})\t(.{
+4})/;
    foreach my $data2 (@rates){
      my $replacement2 = hex($data2);  
      s#$data2#$replacement2#g;
    }

    # print the converted data to the destination file
    print DEST;
  }
  # close the files
  close SOURCE;
  close DEST;
}
&create_vals;

# perform conversion from raw values to human readable output
sub create_vals{      
  my $source = "$ARGV[0]"."_tmp.txt";
  my $dest = "$ARGV[0]"."_converted.txt";
  chomp $source;
  open SOURCE, '<', $source or die "Cannot open '$source' $!";
  open DEST, '>', $dest or die "Cannot open '$dest' for writing $!";
  while(<SOURCE>){
    s#(65301)\t(.{2})\t(8)\t(.{1,5})\t(.{1,5})\t(.{1,4})#"'".$1."','".
+ $2."','". $3."','". ($4/8)."','". ($5/8)."','". ($6/20)."'"#eg;
    s#(65302)\t(.{2})\t(8)\t(.{1,3})\t(.{1,3})\t(.{1,3})\t(.{1,3})\t(.
+{1,3})\t(.{1,3})\t(.{1,3})\t(.{1,3})#"'".$1."','". $2."','". $3."','"
+. $4."','". (($5*1.8)-40)."','". (($6*1.8)-40)."','". ($7*.58)."','".
+($8*.58)."','".($9*.29008)."','".(($10*1.8)-40)."','".$11."'"#eg;
    s#(65303)\t(.{2})\t(8)\t(.{1,5})\t(.{1,5})\t(.{1,5})\t(.{1,5})#"'"
+.$1."','". $2."','". $3."','". ($4*0.014)."','". ($5*.05)."'"#eg;
    print DEST;
  }
}
  close SOURCE;
  close DEST;
__END__
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Also, If anyone has any pointers on how to clean this up it would be appreciated as I'm sure that this isn't the most efficient way to handle this (I am still very much a Perl n00b ;-))