IO::InnerFile(3pm) - Man pages

IO::InnerFile(3pm)    User Contributed Perl Documentation    IO::InnerFile(3pm)

NAME
       IO::InnerFile - define a file inside another file

SYNOPSIS
           use strict;
           use warnings;
           use IO::InnerFile;

           # Read a subset of a file:
           my $fh = _some_file_handle;
           my $start = 10;
           my $length = 50;
           my $inner = IO::InnerFile->new($fh, $start, $length);
           while (my $line = <$inner>) {
               # ...
           }

DESCRIPTION
       If you have a file handle that can "seek" and "tell", then you can open
       an IO::InnerFile on a range of the underlying file.

CONSTRUCTORS
       IO::InnerFile implements the following constructors.

   new
           my $inner = IO::InnerFile->new($fh);
           $inner = IO::InnerFile->new($fh, 10);
           $inner = IO::InnerFile->new($fh, 10, 50);

       Create a new IO::InnerFile opened on the given file handle.  The file
       handle supplied MUST be able to both "seek" and "tell".

       The second and third parameters are start and length. Both are defaulted
       to zero (0). Negative values are silently coerced to zero.

METHODS
       IO::InnerFile implements the following methods.

   add_length
           $inner->add_length(30);

       Add to the virtual length of the inner file by the number given in
       bytes.

   add_start
           $inner->add_start(30);

       Add to the virtual position of the inner file by the number given in
       bytes.

   binmode
           $inner->binmode();

       This is a NOOP method just to satisfy the normal IO::File interface.

   close
   fileno
           $inner->fileno();

       This is a NOOP method just to satisfy the normal IO::File interface.

   flush
           $inner->flush();

       This is a NOOP method just to satisfy the normal IO::File interface.

   get_end
           my $num_bytes = $inner->get_end();

       Get the virtual end position of the inner file in bytes.

   get_length
           my $num_bytes = $inner->get_length();

       Get the virtual length of the inner file in bytes.

   get_start
           my $num_bytes = $inner->get_start();

       Get the virtual position of the inner file in bytes.

   getc
   getline
   print LIST
   printf
   read
   readline
   seek
   set_end
           $inner->set_end(30);

       Set the virtual end of the inner file in bytes (this basically just
       alters the length).

   set_length
           $inner->set_length(30);

       Set the virtual length of the inner file in bytes.

   set_start
           $inner->set_start(30);

       Set the virtual start position of the inner file in bytes.

   tell
   write
AUTHOR
       Eryq (eryq@zeegee.com).  President, ZeeGee Software Inc
       (http://www.zeegee.com).

CONTRIBUTORS
       Dianne Skoll (dfs@roaringpenguin.com).

COPYRIGHT & LICENSE
       Copyright (c) 1997 Erik (Eryq) Dorfman, ZeeGee Software, Inc. All rights
       reserved.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

perl v5.38.2                       2024-07-31                IO::InnerFile(3pm)

Generated by dwww version 1.16 on Tue Dec 16 07:23:45 CET 2025.