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<?php
/**
* XMP Reader - Read XMP data
*
* Zoph is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Zoph is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* @author Jeroen Roos
* @package Zoph
*/
namespace xmp;
use file;
use XMLReader;
use log;
/**
* @author Jeroen Roos
* @package Zoph
*/
class reader {
/** @var array names of XMP/rdf containers */
private static $containers = array("rdf:Seq", "rdf:Bag", "rdf:Alt");
/** @var array names of XMP/rdf container elements */
private static $containerElements = array("rdf:li");
/** @var array xmp data */
private $xmpdata = array();
/** @var array file data - file contents */
private $XMPs = array();
/** @var sidecar from which data was loaded */
public ?string $sidecar = null;
/** @param array Extensions to try for XMP Sidecar files */
private $XMPext=array("xmp", "XMP", "xml", "XML");
/**
* Create new xmp/reader object
* @param file file to read
*/
public function __construct(private file $file) {
}
/**
* Read XMP from sidecar files
*/
public function getXMPfromSidecar() {
log::msg("Loading XMP from sidecar files", log::NOTIFY, log::IMPORT);
foreach ($this->XMPext as $ext) {
foreach (array($this->file->getName(), $this->file->getNameNoExt()) as $name) {
$filename = $this->file->getPath() . "/" . $name . "." . $ext;
log::msg("Trying " . $filename, log::DEBUG, log::IMPORT);
if (file_exists($filename)) {
log::msg("Found " . $filename, log::DEBUG, log::IMPORT);
$sidecar = new file($filename);
$xmp = new self($sidecar);
$this->sidecar = $sidecar->getName();
return $xmp->getXMP();
}
}
}
log::msg("No sidecar file found", log::NOTIFY, log::IMPORT);
return array();
}
/**
* Read XMP from file
*/
public function getXMP() {
$this->file->getMime();
switch ($this->file->type) {
case "image":
$this->getXMPfromJPEG();
break;
case "xmp":
$this->getXMPfromXML();
break;
default:
throw new fileUnknownFileTypeException("Unknown filetype " . $this->file->type);
break;
}
$this->readXMPs();
$return = array();
foreach ($this->xmpdata as $xmp) {
$return[] = new data($xmp);
}
return $return;
}
/**
* Read XMP-xml from an XML-file
*/
private function getXMPfromXML() {
$this->XMPs=array(file_get_contents($this->file));
}
private function readXMPs() {
foreach ($this->XMPs as $xmp) {
$this->xmpdata[]=$this->readXMP($xmp);
}
}
/**
* Decode XMP data from XML
* @param string XML
* @return array XMPdata
*/
public function readXMP($xmp) {
$xml = new XMLReader();
$xml->XML($xmp);
return $this->decodeXML($xml);
}
/**
* Read XMP-xml from a JPEG
* Read JPG in chunks of 1024 bytes to keep memory usage low.
*/
private function getXMPfromJPEG() {
$fp = fopen($this->file, "rb");
$buffer = "";
$open = false;
while (($data = fread($fp, 1024)) !== false) {
if ($data === "") {
break;
}
$buffer .= $data;
if (!$open) {
$openpos =strpos($buffer, "<x:xmpmeta");
if ($openpos !== false) {
$open = true;
} else {
// keep 12 bytes of buffer, in case the XMP is right on the edge
$buffer = substr($buffer, strlen($buffer) - 12);
}
} else {
$closepos =strpos($buffer, "</x:xmpmeta>");
if ($closepos !== false) {
$this->XMPs[] = substr($buffer, $openpos, ($closepos - $openpos) + 12);
$open = false;
$buffer = substr($buffer, $closepos + 11);
}
}
}
}
private function decodeXML(XMLReader $xml) {
$node=array();
while ($xml->read()) {
if ($xml->nodeType==XMLReader::ELEMENT) {
$nodename = $xml->name;
if (in_array($nodename, self::$containers)) {
$container = $nodename;
$containerElement = false;
} else if (in_array($nodename, self::$containerElements)) {
$container = false;
$containerElement = true;
} else {
$container = false;
$containerElement = false;
}
$empty=$xml->isEmptyElement;
if ($xml->hasAttributes) {
$attr=array();
$xml->moveToFirstAttribute();
do {
$attr[$xml->name] = $xml->value;
} while ($xml->moveToNextAttribute());
if (!$empty) {
$data=array_merge($attr, (array) $this->decodeXML($xml));
} else {
$data=$attr;
}
} else if ($xml->hasValue) {
$data = $xml->value;
} else {
$data=$this->decodeXML($xml);
}
if ($container) {
$node = $data;
} else if ($containerElement) {
$node[] =$data;
} else {
if (!is_array($node)) {
$node = array($node);
}
if (!isset($node[$nodename])) {
$node[$nodename] = $data;
} else {
$nodedata = $node[$nodename];
$node[$nodename] = array_merge(
$nodedata,
$data
);
}
}
} else if ($xml->nodeType==XMLReader::TEXT) {
$node = $xml->value;
} else if ($xml->nodeType==XMLReader::END_ELEMENT) {
break;
} else if (($xml->nodeType != XMLReader::WHITESPACE) &&
($xml->nodeType != XMLReader::SIGNIFICANT_WHITESPACE) &&
($xml->nodeType != XMLReader::PI)) {
$node[] = $xml->value;
}
}
return $node;
}
}
?>
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