<?php
/**
-Class to deal with reconciling and extracting metadata from bitmap images.
-This is meant to comply with http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf
+ * Extraction of metadata from different bitmap image types.
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Media
+ */
-This sort of acts as an intermediary between MediaHandler::getMetadata
-and the various metadata extractors.
-
-@todo other image formats.
-*/
+/**
+ * Class to deal with reconciling and extracting metadata from bitmap images.
+ * This is meant to comply with http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf
+ *
+ * This sort of acts as an intermediary between MediaHandler::getMetadata
+ * and the various metadata extractors.
+ *
+ * @todo other image formats.
+ * @ingroup Media
+ */
class BitmapMetadataHandler {
- private $metadata = Array();
- private $metaPriority = Array(
- 20 => Array( 'other' ),
- 40 => Array( 'native' ),
- 60 => Array( 'iptc-good-hash', 'iptc-no-hash' ),
- 70 => Array( 'xmp-deprecated' ),
- 80 => Array( 'xmp-general' ),
- 90 => Array( 'xmp-exif' ),
- 100 => Array( 'iptc-bad-hash' ),
- 120 => Array( 'exif' ),
+ private $metadata = array();
+ private $metaPriority = array(
+ 20 => array( 'other' ),
+ 40 => array( 'native' ),
+ 60 => array( 'iptc-good-hash', 'iptc-no-hash' ),
+ 70 => array( 'xmp-deprecated' ),
+ 80 => array( 'xmp-general' ),
+ 90 => array( 'xmp-exif' ),
+ 100 => array( 'iptc-bad-hash' ),
+ 120 => array( 'exif' ),
);
private $iptcType = 'iptc-no-hash';
* @param String $app13 String containing app13 block from jpeg file
*/
private function doApp13 ( $app13 ) {
- $this->iptcType = JpegMetadataExtractor::doPSIR( $app13 );
+ try {
+ $this->iptcType = JpegMetadataExtractor::doPSIR( $app13 );
+ } catch ( MWException $e ) {
+ // Error reading the iptc hash information.
+ // This probably means the App13 segment is something other than what we expect.
+ // However, still try to read it, and treat it as if the hash didn't exist.
+ wfDebug( "Error parsing iptc data of file: " . $e->getMessage() . "\n" );
+ $this->iptcType = 'iptc-no-hash';
+ }
$iptc = IPTC::parse( $app13 );
$this->addMetadata( $iptc, $this->iptcType );
}
- /** get exif info using exif class.
- * Basically what used to be in BitmapHandler::getMetadata().
- * Just calls stuff in the Exif class.
- */
- function getExif ( $filename ) {
- if ( file_exists( $filename ) ) {
- $exif = new Exif( $filename );
+ /**
+ * Get exif info using exif class.
+ * Basically what used to be in BitmapHandler::getMetadata().
+ * Just calls stuff in the Exif class.
+ *
+ * Parameters are passed to the Exif class.
+ *
+ * @param $filename string
+ * @param $byteOrder string
+ */
+ function getExif ( $filename, $byteOrder ) {
+ global $wgShowEXIF;
+ if ( file_exists( $filename ) && $wgShowEXIF ) {
+ $exif = new Exif( $filename, $byteOrder );
$data = $exif->getFilteredData();
if ( $data ) {
$this->addMetadata( $data, 'exif' );
}
/** Main entry point for jpeg's.
- *
- * @param string $file filename (with full path)
- * @return metadata result array.
- * @throws MWException on invalid file.
- */
+ *
+ * @param $filename string filename (with full path)
+ * @return array metadata result array.
+ * @throws MWException on invalid file.
+ */
static function Jpeg ( $filename ) {
$showXMP = function_exists( 'xml_parser_create_ns' );
$meta = new self();
- $meta->getExif( $filename );
- $seg = Array();
+
$seg = JpegMetadataExtractor::segmentSplitter( $filename );
if ( isset( $seg['COM'] ) && isset( $seg['COM'][0] ) ) {
$meta->addMetadata( Array( 'JPEGFileComment' => $seg['COM'] ), 'native' );
}
- if ( isset( $seg['PSIR'] ) ) {
- $meta->doApp13( $seg['PSIR'] );
+ if ( isset( $seg['PSIR'] ) && count( $seg['PSIR'] ) > 0 ) {
+ foreach( $seg['PSIR'] as $curPSIRValue ) {
+ $meta->doApp13( $curPSIRValue );
+ }
}
if ( isset( $seg['XMP'] ) && $showXMP ) {
$xmp = new XMPReader();
$meta->addMetadata( $array, $type );
}
}
+ if ( isset( $seg['byteOrder'] ) ) {
+ $meta->getExif( $filename, $seg['byteOrder'] );
+ }
return $meta->getMetadataArray();
}
+
/** Entry point for png
- * At some point in the future this might
- * merge the png various tEXt chunks to that
- * are interesting, but for now it only does XMP
- *
- * @param $filename String full path to file
- * @return Array Array for storage in img_metadata.
- */
+ * At some point in the future this might
+ * merge the png various tEXt chunks to that
+ * are interesting, but for now it only does XMP
+ *
+ * @param $filename String full path to file
+ * @return Array Array for storage in img_metadata.
+ */
static public function PNG ( $filename ) {
$showXMP = function_exists( 'xml_parser_create_ns' );
* They don't really have native metadata, so just merges together
* XMP and image comment.
*
- * @param $filename full path to file
+ * @param $filename string full path to file
* @return Array metadata array
*/
static public function GIF ( $filename ) {
unset( $baseArray['comment'] );
unset( $baseArray['xmp'] );
-
+
$baseArray['metadata'] = $meta->getMetadataArray();
$baseArray['metadata']['_MW_GIF_VERSION'] = GIFMetadataExtractor::VERSION;
return $baseArray;
}
+ /**
+ * This doesn't do much yet, but eventually I plan to add
+ * XMP support for Tiff. (PHP's exif support already extracts
+ * but needs some further processing because PHP's exif support
+ * is stupid...)
+ *
+ * @todo Add XMP support, so this function actually makes
+ * sense to put here.
+ *
+ * The various exceptions this throws are caught later.
+ * @param $filename String
+ * @throws MWException
+ * @return Array The metadata.
+ */
+ static public function Tiff ( $filename ) {
+ if ( file_exists( $filename ) ) {
+ $byteOrder = self::getTiffByteOrder( $filename );
+ if ( !$byteOrder ) {
+ throw new MWException( "Error determining byte order of $filename" );
+ }
+ $exif = new Exif( $filename, $byteOrder );
+ $data = $exif->getFilteredData();
+ if ( $data ) {
+ $data['MEDIAWIKI_EXIF_VERSION'] = Exif::version();
+ return $data;
+ } else {
+ throw new MWException( "Could not extract data from tiff file $filename" );
+ }
+ } else {
+ throw new MWException( "File doesn't exist - $filename" );
+ }
+ }
+ /**
+ * Read the first 2 bytes of a tiff file to figure out
+ * Little Endian or Big Endian. Needed for exif stuff.
+ *
+ * @param $filename String The filename
+ * @return String 'BE' or 'LE' or false
+ */
+ static function getTiffByteOrder( $filename ) {
+ $fh = fopen( $filename, 'rb' );
+ if ( !$fh ) return false;
+ $head = fread( $fh, 2 );
+ fclose( $fh );
+
+ switch( $head ) {
+ case 'II':
+ return 'LE'; // II for intel.
+ case 'MM':
+ return 'BE'; // MM for motorla.
+ default:
+ return false; // Something went wrong.
+
+ }
+ }
+
+
}
dépôts / lhc / web / wiklou.git / blobdiff