in reply to Re^2: Reading binary file byte by byte
in thread Reading binary file byte by byte

Then we are back to reading a byte at a time from a file, which needs some thought applied first in terms of performance. It might be better than sysread which forces a system call with a 1 byte buffer, if thats what you request.

Either way, if using buffered I/O, it seems more ept to read at least a page of memory in size at a time from the file but then process that one byte at a time.

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Re^4: Reading binary file byte by byte
by ikegami (Patriarch) on Dec 23, 2010 at 16:03 UTC
    read and readline (<>) are buffered, so it's not that bad. If you need Perl-side buffering, the following would be much better: 
    use constant BLK_SIZE => 64*1024;

{
   open(my $FILE, "file.binary") or die $!;
   binmode($FILE);

   while (read($FILE, my $buf, BLK_SIZE)) {
      for my $byte (unpack('a*', $buf)) {
         ...
      }
   }

   close $FILE;
}

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