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IO::Mark - Read unseekable filehandles non-destructively. - metacpan.org
<!DOCTYPE html> <html lang="en-US"> <head> <title>IO::Mark - Read unseekable filehandles non-destructively. - metacpan.org</title> <link rel="preload" as="fetch" href="/account/login_status" crossorigin="anonymous" /> <link href="/assets/style-XFEQ536G.css" rel="stylesheet" type="text/css"> <script src="/assets/main-WXBSEDQJ.js" type="module"></script> <link rel="alternate" type="application/rss+xml" title="Recent CPAN Uploads of IO-Mark - MetaCPAN" href="/dist/IO-Mark/releases.rss" /> <link rel="canonical" href="https://metacpan.org/pod/IO::Mark" /> <meta name="description" content="Read unseekable filehandles non-destructively." /> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=5"> <link rel="shortcut icon" href="/static/icons/favicon.ico"> <link rel="apple-touch-icon" sizes="152x152" href="/static/icons/apple-touch-icon.png"> <link rel="search" href="/static/opensearch.xml" type="application/opensearchdescription+xml" title="MetaCPAN"> <script 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href="/release/ANDYA/IO-Mark-v0.0.1/view/lib/IO/Mark.pm">This version</a> </li> <li> <a href="/pod/IO::Mark">Latest version</a> </li> <li> </li> <li> </li> </ul> </div> </nav> <div class="content-navigation"> <div class="breadcrumbs"> <span> <a data-keyboard-shortcut="g a" rel="author" href="/author/ANDYA" class="author-name">Andy Armstrong</a> </span> <span> / </span> <div class="release dist-release status-latest maturity-released"> <span class="dropdown"><b class="caret"></b></span> <select class="select-navigator "> <option selected value="/release/ANDYA/IO-Mark-v0.0.1/view/lib/IO/Mark.pm" >v0.0.1 (ANDYA on 2007-02-28)</option> </select> <a data-keyboard-shortcut="g d" class="release-name" href="/dist/IO-Mark">IO-Mark-v0.0.1</a> </div> <span class="river-gauge-gauge"> <svg width="24px" height="15px" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <g> <title> River stage zero No dependents </title> <rect x="0" y="0" width="4" height="15" fill="#e4e2e2" /> <rect x="5" y="0" width="4" height="15" fill="#e4e2e2" /> <rect x="10" y="0" width="4" height="15" fill="#e4e2e2" /> <rect x="15" y="0" width="4" height="15" fill="#e4e2e2" /> <rect x="20" y="0" width="4" height="15" fill="#e4e2e2" /> </g> </svg> </span> <div id="IO-Mark-fav" class="show-logged-in"> <form action="/account/favorite/add" style="display: inline" method="POST"> <input type="hidden" name="remove" value="0"> <input type="hidden" name="release" value="IO-Mark-v0.0.1"> <input type="hidden" name="author" value="ANDYA"> <input type="hidden" name="distribution" value="IO-Mark"> <button type="submit" class="favorite"><span></span> ++</button> </form> </div> <div class="show-logged-out"> <button class="fav-not-logged-in favorite"><span></span> ++</button> </div> / <span>IO::Mark</span> </div> </div> <main class="content"> <input id="ADOPTME" type="checkbox" class="notification-toggle-checkbox" /> <div id="metacpan_notification" class="well collapsed notify-ADOPTME"> <label class="remove-notification" for="ADOPTME" > <i class="fa fa-fw fa-times black"></i> </label> <div id="metacpan_notification-container"> <h2>Why not adopt me?</h2> <div> This distribution is up for adoption! If you're interested then please contact the PAUSE module admins via <a href="mailto:modules@perl.org,andy@hexten.net?subject=Adopt%20IO%3A%3AMark%3F&body=Hello%2C%0A%0AI%27m%20interested%20in%20adopting%20the%20IO%3A%3AMark%20module.%20If%20you%20can%20grant%20me%20the%20privilege%20I%20will%20release%20the%20next%20version.%0A%0A">email</a>. <a href="/about/faq#howtoadoptadistribution"><i class="fa fa-info-circle"></i></a> </div> </div> </div> <nav class="toc"> <div class="toc-header"><strong>Contents</strong></div> <ul> <li><a href="#NAME">NAME</a></li> <li><a href="#VERSION">VERSION</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#INTERFACE">INTERFACE</a></li> <li><a href="#CONFIGURATION-AND-ENVIRONMENT">CONFIGURATION AND ENVIRONMENT</a></li> <li><a href="#DEPENDENCIES">DEPENDENCIES</a></li> <li><a href="#INCOMPATIBILITIES">INCOMPATIBILITIES</a></li> <li><a href="#BUGS-AND-LIMITATIONS">BUGS AND LIMITATIONS</a></li> <li><a href="#AUTHOR">AUTHOR</a></li> <li><a href="#LICENCE-AND-COPYRIGHT">LICENCE AND COPYRIGHT</a></li> <li><a href="#DISCLAIMER-OF-WARRANTY">DISCLAIMER OF WARRANTY</a></li> </ul></nav> <div class="pod anchors"> <h1 id="NAME">NAME</h1> <p>IO::Mark - Read unseekable filehandles non-destructively.</p> <h1 id="VERSION">VERSION</h1> <p>This document describes IO::Mark version 0.0.1</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code>use IO::Mark; sub examine { my $fh = shift; my $mark = IO::Mark->new( $fh ); my $buf; # Reads from $fh via $mark $mark->read( $buf, 1000, 0 ); # Do something with $buf # When $mark goes out of scope $fh no data will appear to have # been consumed from $fh }</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>This is alpha quality code. It's slow. It may have bugs.</p> <p>Imagine you've got a function <code>get_image_size</code>. You pass it a filehandle that's open on an image file and it returns the dimensions of the image.</p> <p>Imagine also that you have an open socket on which you are expecting to receive an image. You'd like to know the dimensions of that image and also capture its data.</p> <p>If you pass the socket handle to <code>get_image_size</code> it'll consume some data from that socket - enough to read the image header and work out its dimensions. Unfortunately any data that <code>get_image_size</code> reads is lost; you know the dimensions of the image but you've lost some of its data and you can't rewind the socket to go back to the start of the image; sockets aren't seekable.</p> <pre><code>sub send_image { my $socket = shift; # This works fine... my ($width, $height) = get_image_size( $socket ); # ...but the data we send here will be missing whatever header # bytes get_image_size consumed. send_image_data( $width, $height, $socket ); }</code></pre> <p>You could buffer the entire image in a file, open the file and pass that handle to <code>get_image_size</code>. That works but means that we can't compute the image size until we have the whole image. If instead of an image file we were dealing with streaming audio the input stream might be effectively infinite - which would make caching it in a file inconvenient.</p> <p>We could rewrite <code>get_image_size</code> to cache whatever data it reads from the socket. Then we could send that data before sending the remainder of the data from the socket. That probably means digging around inside a function we didn't write and coupling its interface tightly to our application. It'd be good to avoid that.</p> <p>Here's the solution:</p> <pre><code>use IO::Mark; sub send_image { my $socket = shift; my $mark = IO::Mark->new( $socket ); # This works fine... my ($width, $height) = get_image_size( $mark ); $mark->close; # ... and so does this! send_image_data( $width, $height, $socket ); }</code></pre> <p>An <code>IO::Mark</code> is an <a href="/pod/IO::Handle">IO::Handle</a> that returns data from the handle from which it was created without consuming that data from the point of view of the original handle.</p> <p>Note the explicit call to <code>close</code> once we're done with <code>$mark</code>. As long as the cloned <code>IO::Mark</code> handle is in scope and open any data read from the original handle will be buffered in memory in case it needs to be read from the cloned handle too. To prevent this either explicitly close the cloned handle or allow it to go out of scope.</p> <h1 id="INTERFACE">INTERFACE</h1> <dl> <dt id="new(-$fh-)"><a id="new"></a><a id="new-fh"></a><code>new( $fh )</code></dt> <dd> <p>Create a clone of a filehandle. Reading data from the clone will not advance the position of the original handle.</p> <p>The original handle and any clones you have created will each maintain an independent file pointer.</p> </dd> </dl> <h1 id="CONFIGURATION-AND-ENVIRONMENT"><a id="CONFIGURATION"></a>CONFIGURATION AND ENVIRONMENT</h1> <p>IO::Mark requires no configuration files or environment variables.</p> <h1 id="DEPENDENCIES">DEPENDENCIES</h1> <p>Which Perl version?</p> <p>None.</p> <h1 id="INCOMPATIBILITIES">INCOMPATIBILITIES</h1> <p>None reported.</p> <h1 id="BUGS-AND-LIMITATIONS"><a id="BUGS"></a>BUGS AND LIMITATIONS</h1> <p>No bugs have been reported.</p> <p>Please report any bugs or feature requests to <code>bug-io-mark@rt.cpan.org</code>, or through the web interface at <a href="http://rt.cpan.org">http://rt.cpan.org</a>.</p> <h1 id="AUTHOR">AUTHOR</h1> <p>Andy Armstrong <code><andy@hexten.net></code></p> <h1 id="LICENCE-AND-COPYRIGHT"><a id="LICENCE"></a>LICENCE AND COPYRIGHT</h1> <p>Copyright (c) 2007, Andy Armstrong <code><andy@hexten.net></code>. All rights reserved.</p> <p>This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <a href="/pod/perlartistic">perlartistic</a>.</p> <h1 id="DISCLAIMER-OF-WARRANTY"><a id="DISCLAIMER"></a>DISCLAIMER OF WARRANTY</h1> <p>BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.</p> <p>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.</p> <div class="pod-errors"><p>1 POD Error</p><div class="pod-errors-detail"><p>The following errors were encountered while parsing the POD:</p><dl><dt>Around line 44:</dt><dd><p>Non-ASCII character seen before =encoding in 'my $fh'. Assuming UTF-8</p></dd></dl></div></div></div> <div id="metacpan_install-instructions-dialog" class="modal fade"> <div class="modal-dialog"> <div class="modal-content"> <div class="modal-header"> <button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button> <h4 class="modal-title">Module Install Instructions</h4> </div> <div class="modal-body"> <p>To install IO::Mark, copy and paste the appropriate command in to your terminal.</p> <p><a href="/dist/App-cpanminus/view/bin/cpanm">cpanm</a></p> <pre><code>cpanm IO::Mark</code></pre> <p><a href="/pod/CPAN">CPAN shell</a></p> <pre><code>perl -MCPAN -e shell install IO::Mark</code></pre> <p>For more information on module installation, please visit <a href="https://www.cpan.org/modules/INSTALL.html">the detailed CPAN module installation guide</a>.</p> </div> <div class="modal-footer"> <a href="#" data-dismiss="modal" class="btn">Close</a> </div> </div> </div> </div> </main> <div class="content-pagination"> </div> 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