<?php

/**
 * Image METADATA PHP class for the WordPress plugin NextGEN Gallery
 * nggmeta.lib.php
 * 
 * @author 		Alex Rabe 
 * @copyright 	Copyright 2007
 * 
 */
	  
class nggMeta{

	/**** Image Data ****/
    var $imagePath		=	"";		// ABS Path to the image
	var $exif_data 		= 	false;	// EXIF data array
	var $iptc_data 		= 	false;	// IPTC data array
	var $xmp_data  		= 	false;	// XMP data array
	/**** Filtered Data ****/
	var $exif_array 	= 	false;	// EXIF data array
	var $iptc_array 	= 	false;	// IPTC data array
	var $xmp_array  	= 	false;	// XMP data array

 	/**
 	 * nggMeta::nggMeta()
 	 * 
 	 * @param string $image path to a image
 	 * @param bool $onlyEXIF parse only exif if needed
 	 * @return
 	 */
 	function nggMeta($image, $onlyEXIF = false) {
 		$this->imagePath = $image;
 		
 		if ( !file_exists( $this->imagePath ) )
			return false;

 		$size = @getimagesize ( $this->imagePath, $metadata );

		if ($size && is_array($metadata)) {

			// get exif - data
			if ( is_callable('exif_read_data'))
			$this->exif_data = @exif_read_data($this->imagePath, 0, true );
 			
 			// stop here if we didn't need other meta data
 			if ($onlyEXIF)
 				return true;
 			
 			// get the iptc data - should be in APP13
 			if ( is_callable('iptcparse'))
			$this->iptc_data = @iptcparse($metadata["APP13"]);

			// get the xmp data in a XML format
			if ( is_callable('xml_parser_create'))
			$this->xmp_data = $this->extract_XMP($this->imagePath);
			
			return true;
		}
 		
 		return false;
 	}
	
  /**
   * nggMeta::get_EXIF()
   * See also http://trac.wordpress.org/changeset/6313
   *
   * @return structured EXIF data
   */
	function get_EXIF($object = false) {
		
		if (!$this->exif_data)
			return false;
		
		if (!is_array($this->exif_array)){
			
			$meta= array();
			
			// taken from WP core
			$exif = $this->exif_data['EXIF'];
			if (!empty($exif['FNumber']))
				$meta['aperture'] = "F " . round( $this->exif_frac2dec( $exif['FNumber'] ), 2 );
			if (!empty($exif['Model']))
				$meta['camera'] = trim( $exif['Model'] );
			if (!empty($exif['DateTimeDigitized']))
				$meta['created_timestamp'] = date_i18n(get_option('date_format').' '.get_option('time_format'), $this->exif_date2ts($exif['DateTimeDigitized']));
			if (!empty($exif['FocalLength']))
				$meta['focal_length'] = $this->exif_frac2dec( $exif['FocalLength'] ) . __(' mm','nggallery');
			if (!empty($exif['ISOSpeedRatings']))
				$meta['iso'] = $exif['ISOSpeedRatings'];
			if (!empty($exif['ExposureTime'])) {
				 $meta['shutter_speed']  = $this->exif_frac2dec ($exif['ExposureTime']);
				 $meta['shutter_speed']  =($meta['shutter_speed'] > 0.0 and $meta['shutter_speed'] < 1.0) ? ( "1/" . round( 1 / $meta['shutter_speed'], -1) ) : ($meta['shutter_speed']); 
				 $meta['shutter_speed'] .=  __(' sec','nggallery');
				}
	
			// additional information
			$exif = $this->exif_data['IFD0'];
			if (!empty($exif['Model']))
				$meta['camera'] = $exif['Model'];
			if (!empty($exif['Make']))
				$meta['make'] = $exif['Make'];
			if (!empty($exif['ImageDescription']))
				$meta['title'] = utf8_encode($exif['ImageDescription']);	
	
			// this is done by Windows
			$exif = $this->exif_data['WINXP'];

			if (!empty($exif['Title']) && empty($meta['title']))
				$meta['title'] = utf8_encode($exif['Title']);
			if (!empty($exif['Author']))
				$meta['author'] = utf8_encode($exif['Author']);
			if (!empty($exif['Keywords']))
				$meta['tags'] = utf8_encode($exif['Keywords']);
			if (!empty($exif['Subject']))
				$meta['subject'] = utf8_encode($exif['Subject']);
			if (!empty($exif['Comments']))
				$meta['caption'] = utf8_encode($exif['Comments']);
							
			$this->exif_array = $meta;
		}
		
		// return one element if requested	
		if ($object)
			return $this->exif_array[$object];
				
		return $this->exif_array;
	
	}
	
	// convert a fraction string to a decimal
	function exif_frac2dec($str) {
		@list( $n, $d ) = explode( '/', $str );
		if ( !empty($d) )
			return $n / $d;
		return $str;
	}
	
	// convert the exif date format to a unix timestamp
	function exif_date2ts($str) {
		// seriously, who formats a date like 'YYYY:MM:DD hh:mm:ss'?
		@list( $date, $time ) = explode( ' ', trim($str) );
		@list( $y, $m, $d ) = explode( ':', $date );
	
		return strtotime( "{$y}-{$m}-{$d} {$time}" );
	}
	
  /**
   * nggMeta::readIPTC() - IPTC Data Information for EXIF Display
   *
   * @param mixed $output_tag
   * @return IPTC-tags
   */
	function get_IPTC($object = false) {
	
	if (!$this->iptc_data)
		return false;

	if (!is_array($this->iptc_array)){
	
		// --------- Set up Array Functions --------- //
			$iptcTags = array (
				"2#005" => 'title',
				"2#007" => 'status',
				"2#012" => 'subject',
				"2#015" => 'category',
				"2#025" => 'keywords',
				"2#055" => 'created_date',
				"2#060" => 'created_time',
				"2#080" => 'author',
				"2#085" => 'position',
				"2#090" => 'city',
				"2#092" => 'location',
				"2#095" => 'state',
				"2#100" => 'country_code',
				"2#101" => 'country',
				"2#105" => 'headline',
				"2#110" => 'credit',
				"2#115" => 'source',
				"2#116" => 'copyright',
				"2#118" => 'contact',
				"2#120" => 'caption'
			);
			
			// var_dump($this->iptc_data);
			$meta = array();
			foreach ($iptcTags as $key => $value) {
				if ($this->iptc_data[$key])
					$meta[$value] = trim(utf8_encode(implode(", ", $this->iptc_data[$key])));
	
			}
			$this->iptc_array = $meta;
		}
		
		// return one element if requested	
		if ($object)
			return $this->iptc_array[$object];			
		
		return $this->iptc_array;
	}

  /**
   * nggMeta::extract_XMP()
   * get XMP DATA  
   * code by Pekka Saarinen http://photography-on-the.net	
   *
   * @param mixed $filename
   * @return XML data
   */
	function extract_XMP( $filename ) {

		//TODO:Require a lot of memory, could be better
		ob_start();
		@readfile($filename);
    	$source = ob_get_contents();
    	ob_end_clean();

		$start = strpos( $source, "<x:xmpmeta"   );
		$end   = strpos( $source, "</x:xmpmeta>" );
		if ((!$start === false) && (!$end === false)) {
			$lenght = $end - $start;
			$xmp_data = substr($source, $start, $lenght+12 );
			unset($source);
			return $xmp_data;
		} 
		
		unset($source);
		return false;
	}

	/**
	 * nggMeta::get_XMP()
	 *
	 * @package Taken from http://php.net/manual/en/function.xml-parse-into-struct.php
	 * @author Alf Marius Foss Olsen & Alex Rabe
	 * @return XML Array or object
	 *
	 */
	function get_XMP($object = false) {
   
		if(!$this->xmp_data)
			return false;
			
		if (!is_array($this->xmp_array)){ 
			
			$parser = xml_parser_create();
			xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0); // Dont mess with my cAsE sEtTings
			xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1); // Dont bother with empty info
			xml_parse_into_struct($parser, $this->xmp_data, $values);
			xml_parser_free($parser);
			  
			$xmlarray			= array();	// The XML array
			$this->xmp_array  	= array();	// The returned array
			$stack        		= array();	// tmp array used for stacking
		 	$list_array   		= array();	// tmp array for list elements
		 	$list_element 		= false;	// rdf:li indicator
		 	  
			foreach($values as $val) {
				
			  	if($val['type'] == "open") {
			      	array_push($stack, $val['tag']);
			      	
			    } elseif($val['type'] == "close") {
			    	// reset the compared stack
			    	if ($list_element == false)
			      		array_pop($stack);
			      	// reset the rdf:li indicator & array
			      	$list_element = false;
			      	$list_array   = array();
			      	
			    } elseif($val['type'] == "complete") {
					if ($val['tag'] == "rdf:li") {
						// first go one element back
						if ($list_element == false)
							array_pop($stack);
						$list_element = true;
						// save it in our temp array
						$list_array[] = $val['value']; 
						// in the case it's a list element we seralize it
						$value = implode(",", $list_array);
						$this->setArrayValue($xmlarray, $stack, $value);
			      	} else {
			      		array_push($stack, $val['tag']);
			      		$this->setArrayValue($xmlarray, $stack, $val['value']);
			      		array_pop($stack);
			      	}
			    }
			    
			} // foreach
			
			// cut off the useless tags
			$xmlarray = $xmlarray['x:xmpmeta']['rdf:RDF']['rdf:Description'];
			  
			// --------- Some values from the XMP format--------- //
			$xmpTags = array (
				'xap:CreateDate' 			=> 'created_timestamp',
				'xap:ModifyDate'  			=> 'last_modfied',
				'xap:CreatorTool' 			=> 'tool',
				'dc:format' 				=> 'format',
				'dc:title'					=> 'title',
				'dc:creator' 				=> 'author',
				'dc:subject' 				=> 'keywords',
				'dc:description' 			=> 'caption',
				'photoshop:AuthorsPosition' => 'position',
				'photoshop:City'			=> 'city',
				'photoshop:Country' 		=> 'country'
			);

			foreach ($xmpTags as $key => $value) {
				// if the kex exist
				if ($xmlarray[$key]) {
					switch ($key) {
						case 'xap:CreateDate':
						case 'xap:ModifyDate':
							$this->xmp_array[$value] = date_i18n(get_option('date_format').' '.get_option('time_format'), strtotime($xmlarray[$key]));
							break;				
						default :
							$this->xmp_array[$value] = $xmlarray[$key];
					}
				}
			}
			
		}
		
		// return one element if requested	
		if ($object)
			return $this->xmp_array[$object];		 
		
		return $this->xmp_array;
	}
	  
	function setArrayValue(&$array, $stack, $value) {
		if ($stack) {
			$key = array_shift($stack);
			//TODO:Review this, reports sometimes a error "Fatal error: Only variables can be passed by reference" (PHP 5.2.6)
	    	$this->setArrayValue($array[$key], $stack, $value);
	    	return $array;
	  	} else {
	    	$array = $value;
	  	}
	}
	
  /**
   * nggMeta::get_META() - return a meta value form the available list 
   *
   * @param string $object
   * @return mixed $value
   */
	function get_META($object = false) {
		
		// defined order XMP , before IPTC and EXIF.
		if ($value = $this->get_XMP($object))
			return $value;
		if ($value = $this->get_IPTC($object))
			return $value;
		if ($value = $this->get_EXIF($object))
			return $value;
		
		// nothing found ?
		return false;
	}
	
  /**
   * nggMeta::i8n_name() -  localize the tag name
   *
   * @param mixed $key
   * @return translated $key
   */
	function i8n_name($key) {
		
		$tagnames = array(
		'aperture' 			=> __('Aperture','nggallery'),
		'credit' 			=> __('Credit','nggallery'),
		'camera' 			=> __('Camera','nggallery'),
		'caption' 			=> __('Caption','nggallery'),
		'created_timestamp' => __('Date/Time','nggallery'),
		'copyright' 		=> __('Copyright','nggallery'),
		'focal_length' 		=> __('Focal length','nggallery'),
		'iso' 				=> __('ISO','nggallery'),
		'shutter_speed' 	=> __('Shutter speed','nggallery'),
		'title' 			=> __('Title','nggallery'),
		'author' 			=> __('Author','nggallery'),
		'tags' 				=> __('Tags','nggallery'),
		'subject' 			=> __('Subject','nggallery'),
		'make' 				=> __('Make','nggallery'),
		'status' 			=> __('Edit Status','nggallery'),
		'category'			=> __('Category','nggallery'),
		'keywords' 			=> __('Keywords','nggallery'),
		'created_date' 		=> __('Date Created','nggallery'),
		'created_time'		=> __('Time Created','nggallery'),
		'position'			=> __('Author Position','nggallery'),
		'city'				=> __('City','nggallery'),
		'location'			=> __('Location','nggallery'),
		'state' 			=> __('Province/State','nggallery'),
		'country_code'		=> __('Country code','nggallery'),
		'country'			=> __('Country','nggallery'),
		'headline' 			=> __('Headline','nggallery'),
		'credit'			=> __('Credit','nggallery'),
		'source'			=> __('Source','nggallery'),
		'copyright'			=> __('Copyright Notice','nggallery'),
		'contact'			=> __('Contact','nggallery'),
		'last_modfied'		=> __('Last modified','nggallery'),
		'tool'				=> __('Program tool','nggallery'),
		'format'			=> __('Format','nggallery')
		);
		
		if ($tagnames[$key]) $key = $tagnames[$key];
		
		return($key);

	}	

	function get_date_time() {

		// get exif - data
		if ( $this->exif_data ) {
			$date_time = $this->exif_data['EXIF']['DateTimeDigitized'];
			// if we didn't get the correct exif value we take filetime
			if ($date_time == null)
				$date_time = $this->exif_data['FILE']['FileDateTime'];
			else
				$date_time = $this->exif_date2ts($date_time);
		} else {
			// if no other date available, get the filetime
			$date_time = @filectime($this->imagePath);	
		}
		
		// Return the MySQL format 
		$date_time = date( 'Y-m-d H:i:s', $date_time );

		return $date_time;
	}

}

?>