function epub_pack_book()
{
    echo "packing epub\n";
    $user = "";
    if (isset($_POST['client'])) {
        $user = rawurldecode($_POST['client']) . '/';
    }
    $meta = epub_get_metadirectory();
    echo "{$meta}\n";
    if (!epub_zip_handle() && epub_isWindows()) {
        epub_pack_ZipLib($meta);
    } elseif (!epub_zip_handle()) {
        chdir($meta);
        echo rawurlencode("*nix zip command used \n");
        $cmd = 'zip -Xr9Dq my-book.epub *';
        exec($cmd, $ar, $ret);
        if ($ret > 0) {
            echo "zip error: exit status={$ret}\n";
            echo "<b>Error codes:</b>\n  4: memory allocation error\n  11-18: unable write to or create file\n  127: zip command not found\n";
            echo "Trying ZipLib\n";
            epub_pack_ZipLib($meta);
        }
    } else {
        echo "ziparchive used\n";
    }
    $plugin =& plugin_load('syntax', 'epub');
    $oldname = $meta . 'my-book.epub';
    $rmdir = $plugin->getConf('rmdir');
    $epub_file = strtolower(date("Y_F_j_h-i-s")) . '.epub';
    $newname = mediaFN("epub:{$user}:{$epub_file}");
    if (rename($oldname, $newname)) {
        $epub_id = cleanID("epub:{$user}:{$epub_file}");
        $helper = new helper_plugin_epub();
        $id = cleanID(rawurldecode($_POST['book_page']));
        echo "ebook id={$id}\n";
        $title = rawurldecode($_POST['title']);
        $helper->addBook($id, $epub_id, $title);
        echo "New Ebook: {$epub_id}\n";
    }
    if ($rmdir == 'y') {
        if (epub_isWindows()) {
            $meta = str_replace('/', '\\', $meta);
            $cmd = "RMDIR /s /q {$meta}";
        } else {
            $cmd = "rm -f -r {$meta}";
        }
        system($cmd, $retval);
        if ($retval) {
            echo "unable to remove dir:<br />&nbsp;&nbsp;{$meta}<br />&nbsp;&nbsp;error code: {$retval}\n";
        } else {
            echo "{$cmd}\n";
        }
    }
}
<?php

if (!defined('DOKU_INC')) {
    define('DOKU_INC', realpath(dirname(__FILE__) . '/../../../../') . '/');
}
if (!defined('NOSESSION')) {
    define('NOSESSION', true);
}
if (!defined('EPUB_DIR')) {
    define('EPUB_DIR', realpath(dirname(__FILE__) . '/../') . '/');
}
require_once DOKU_INC . 'inc/init.php';
require_once EPUB_DIR . '/helper.php';
$helper = new helper_plugin_epub();
$id = rawurldecode($_POST['remove']);
if (!$helper->is_inCache($id)) {
    echo "{$id} is not in the book creator list; you may use it for other purposes.\n";
    echo "To restore it to the list you must make an edit, no matter how small, and re-save the page.";
    exit;
}
$helper->remove_page($id);
if (!$helper->is_inCache($id)) {
    echo "{$id} has been successfully removed from the book creator list.\nTo restore it to the list you must make an edit,\nno matter how small, and re-save the page.";
} else {
    echo "{$id} was not removed from book creator list.\n";
}