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.\" ========================================================================
.\"
.IX Title "IO::InnerFile 3"
.TH IO::InnerFile 3 "2020-01-17" "perl v5.16.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
IO::InnerFile \- define a file inside another file
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    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>) {
\&        # ...
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
If you have a file handle that can \f(CW\*(C`seek\*(C'\fR and \f(CW\*(C`tell\*(C'\fR, then you
can open an IO::InnerFile on a range of the underlying file.
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
IO::InnerFile implements the following constructors.
.SS "new"
.IX Subsection "new"
.Vb 3
\&    my $inner = IO::InnerFile\->new($fh);
\&    $inner = IO::InnerFile\->new($fh, 10);
\&    $inner = IO::InnerFile\->new($fh, 10, 50);
.Ve
.PP
Create a new IO::InnerFile opened on the given file handle.
The file handle supplied \fB\s-1MUST\s0\fR be able to both \f(CW\*(C`seek\*(C'\fR and \f(CW\*(C`tell\*(C'\fR.
.PP
The second and third parameters are start and length. Both are defaulted
to zero (\f(CW0\fR). Negative values are silently coerced to zero.
.SH "METHODS"
.IX Header "METHODS"
IO::InnerFile implements the following methods.
.SS "add_length"
.IX Subsection "add_length"
.Vb 1
\&    $inner\->add_length(30);
.Ve
.PP
Add to the virtual length of the inner file by the number given in bytes.
.SS "add_start"
.IX Subsection "add_start"
.Vb 1
\&    $inner\->add_start(30);
.Ve
.PP
Add to the virtual position of the inner file by the number given in bytes.
.SS "binmode"
.IX Subsection "binmode"
.Vb 1
\&    $inner\->binmode();
.Ve
.PP
This is a \s-1NOOP\s0 method just to satisfy the normal IO::File interface.
.SS "close"
.IX Subsection "close"
.SS "fileno"
.IX Subsection "fileno"
.Vb 1
\&    $inner\->fileno();
.Ve
.PP
This is a \s-1NOOP\s0 method just to satisfy the normal IO::File interface.
.SS "flush"
.IX Subsection "flush"
.Vb 1
\&    $inner\->flush();
.Ve
.PP
This is a \s-1NOOP\s0 method just to satisfy the normal IO::File interface.
.SS "get_end"
.IX Subsection "get_end"
.Vb 1
\&    my $num_bytes = $inner\->get_end();
.Ve
.PP
Get the virtual end position of the inner file in bytes.
.SS "get_length"
.IX Subsection "get_length"
.Vb 1
\&    my $num_bytes = $inner\->get_length();
.Ve
.PP
Get the virtual length of the inner file in bytes.
.SS "get_start"
.IX Subsection "get_start"
.Vb 1
\&    my $num_bytes = $inner\->get_start();
.Ve
.PP
Get the virtual position of the inner file in bytes.
.SS "getc"
.IX Subsection "getc"
.SS "getline"
.IX Subsection "getline"
.SS "print \s-1LIST\s0"
.IX Subsection "print LIST"
.SS "printf"
.IX Subsection "printf"
.SS "read"
.IX Subsection "read"
.SS "readline"
.IX Subsection "readline"
.SS "seek"
.IX Subsection "seek"
.SS "set_end"
.IX Subsection "set_end"
.Vb 1
\&    $inner\->set_end(30);
.Ve
.PP
Set the virtual end of the inner file in bytes (this basically just alters the length).
.SS "set_length"
.IX Subsection "set_length"
.Vb 1
\&    $inner\->set_length(30);
.Ve
.PP
Set the virtual length of the inner file in bytes.
.SS "set_start"
.IX Subsection "set_start"
.Vb 1
\&    $inner\->set_start(30);
.Ve
.PP
Set the virtual start position of the inner file in bytes.
.SS "tell"
.IX Subsection "tell"
.SS "write"
.IX Subsection "write"
.SH "AUTHOR"
.IX Header "AUTHOR"
Eryq (\fIeryq@zeegee.com\fR).
President, ZeeGee Software Inc (\fIhttp://www.zeegee.com\fR).
.SH "CONTRIBUTORS"
.IX Header "CONTRIBUTORS"
Dianne Skoll (\fIdfs@roaringpenguin.com\fR).
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright (c) 1997 Erik (Eryq) Dorfman, ZeeGee Software, Inc. All rights reserved.
.PP
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.