/**
* Used to extract the title, description and links from
* a string consisting of ebook publication data.
*
* @param string $page epub contents
* @param string $url the url where the page contents came from,
* used to canonicalize relative links
*
* @return array a summary of the contents of the page
*
*/
function process($page, $url)
{
$summary = NULL;
$opf_pattern = "/.opf\$/i";
$html_pattern = "/.html\$/i";
$xhtml_pattern = "/.xhtml\$/i";
$epub_url[0] = '';
$epub_language = '';
$epub_title = '';
$epub_unique_identifier = '';
$epub_author = '';
$epub_publisher = '';
$epub_date = '';
$epub_subject = '';
$desc = '';
$htmlcontent = '';
// Open a zip archive
$zip = new PartialZipArchive($page);
$num_files = $zip->numFiles();
for ($i = 0; $i < $num_files; $i++) {
// get the content file names of .epub document
$filename[$i] = $zip->getNameIndex($i);
if (preg_match($opf_pattern, $filename[$i])) {
// Get the file data from zipped folder
$opf_data = $zip->getFromName($filename[$i]);
$opf_summary = $this->xmlToObject($opf_data);
for ($m = 0; $m <= MAX_DOM_LEVEL; $m++) {
for ($n = 0; $n <= MAX_DOM_LEVEL; $n++) {
if (isset($opf_summary->children[$m]->children[$n])) {
$child = $opf_summary->children[$m]->children[$n];
if (isset($child->name) && $child->name == "dc:language") {
$epub_language = $opf_summary->children[$m]->children[$n]->content;
}
if ($opf_summary->children[$m]->children[$n]->name == "dc:title") {
$epub_title = $opf_summary->children[$m]->children[$n]->content;
}
if ($opf_summary->children[$m]->children[$n]->name == "dc:creator") {
$epub_author = $opf_summary->children[$m]->children[$n]->content;
}
if ($opf_summary->children[$m]->children[$n]->name == "dc:identifier") {
$epub_unique_identifier = $opf_summary->children[$m]->children[$n]->content;
}
}
}
}
} else {
if (preg_match($html_pattern, $filename[$i]) || preg_match($xhtml_pattern, $filename[$i])) {
$html = new HtmlProcessor();
$html_data = $zip->getFromName($filename[$i]);
$description[$i] = $html->process($html_data, $url);
$htmlcontent .= $description[$i]['t'];
}
}
}
if ($epub_title != '') {
$desc = " {$epub_title} .";
}
if ($epub_author != '') {
$desc = $desc . " {$epub_author} ";
}
if ($epub_language != '') {
$desc = $desc . " {$epub_language} ";
}
if ($epub_unique_identifier != '') {
$desc = $desc . " URN-" . $epub_unique_identifier . ".";
}
if ($epub_publisher != '') {
$desc = $desc . " {$epub_publisher} ";
}
if ($epub_date != '') {
$desc = $desc . " {$epub_date} ";
}
if ($epub_subject != '') {
$desc = $desc . " {$epub_subject} ";
}
$desc = $desc . $htmlcontent;
//restrict the length of the description to maximum description length
if (strlen($desc) > self::$max_description_len) {
$desc = substr($desc, 0, self::$max_description_len);
}
$summary[self::TITLE] = $epub_title;
$summary[self::DESCRIPTION] = $desc;
$summary[self::LANG] = $epub_language;
$summary[self::LINKS] = $epub_url;
$summary[self::PAGE] = $page;
return $summary;
}
