Let me give yall a better explanation of what i am trying to do, i already have the byte reversing done so no need to read a file backwards, but i can open both files before the byte reversal like this:
use File::Slurp;

open my $in_file, '<', "file";
binmode($file);

open ( my $out_file, '>', "reversed" ); 
binmode($out_file);

my ( $buf, $data, $n, $bytes ); 

while (( $n = read $in_file, $data, 4096 ) != 0 ) {
    syswrite $out_file, pack( "v*", unpack("n*", $data ));   
    $bytes+=$n;
}

[download]

this above code will successfully read a file then byte reverse it to the other file, but you have to have a file on disk to do it.


now, what i want to be able to do, is open the $in_file, then byte reverse it in memory, and then write it to file after reversing it, or in other words, byte reverse the file in memory, then do whatever i want with it.


use File::Slurp;


open ( my $in_file, '<', "file" );
binmode( $file );

my $temp;
open  my $mem_file, '>', \$temp;
binmode( $mem_file );

my ( $buf, $data, $n, $bytes ); 

while (( $n = read $in_file, $data, 4096 ) != 0 ) {
    syswrite $mem_file, pack( "v*", unpack("n*", $data ));   
    $bytes+=$n;
}

open ( my $out_file, '>', "reversed" ); 
binmode( $out_file );

syswrite ( $out_file, $mem_file );

[download]


i have tried a few different things and nothing has worked tho i am able to get the program to actually write the file, but it writes SCALAR(XXXXXXXX) or GLOB(XXXXXXXX) ect to the file and not the actual reversed data.

In reply to Re: Best way to read a file into memory and use normal operation on memory file? by james28909
in thread Best way to read a file into memory and use normal operation on memory file? by james28909

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