JpegMetadataExtractor Class Reference

Class for reading jpegs and extracting metadata. More...

Static Public Member Functions
static	doPSIR ($app13)
	This reads the photoshop image resource. More...
static	segmentSplitter ($filename)
	Function to extract metadata segments of interest from jpeg files based on GIFMetadataExtractor. More...

Public Attributes
const	MAX_JPEG_SEGMENTS = 200

Static Private Member Functions
static	jpegExtractMarker (&$fh)
	Helper function for jpegSegmentSplitter. More...

Detailed Description

Class for reading jpegs and extracting metadata.

see also BitmapMetadataHandler.

Based somewhat on GIFMetadataExtractor.

Definition at line 32 of file JpegMetadataExtractor.php.

Member Function Documentation

static JpegMetadataExtractor::doPSIR (   $app13 )

static

This reads the photoshop image resource.

Currently it only compares the iptc/iim hash with the stored hash, which is used to determine the precedence of the iptc data. In future it may extract some other info, like url of copyright license.

This should generally be called by BitmapMetadataHandler::doApp13()

Parameters

string

$app13

Photoshop psir app13 block from jpg.

Exceptions

MWException

(It gets caught next level up though)

Returns

string If the iptc hash is good or not. One of 'iptc-no-hash', 'iptc-good-hash', 'iptc-bad-hash'.

Definition at line 206 of file JpegMetadataExtractor.php.

References wfUnpack().

Referenced by BitmapMetadataHandler\doApp13(), JpegMetadataExtractorTest\testIPTCHashComparisionBadHash(), JpegMetadataExtractorTest\testIPTCHashComparisionGoodHash(), and JpegMetadataExtractorTest\testIPTCHashComparisionNoHash().

static JpegMetadataExtractor::jpegExtractMarker ( &  $fh )

staticprivate

Helper function for jpegSegmentSplitter.

Parameters

resource

&$fh

File handle for JPEG file

Exceptions

MWException

Returns

string Data content of segment.

Definition at line 175 of file JpegMetadataExtractor.php.

References wfUnpack().

static JpegMetadataExtractor::segmentSplitter (   $filename )

static

Function to extract metadata segments of interest from jpeg files based on GIFMetadataExtractor.

we can almost use getimagesize to do this but gis doesn't support having multiple app1 segments and those can't extract xmp on files containing both exif and xmp data

Parameters

string

$filename

Name of jpeg file

Returns

array Array of interesting segments.

Exceptions

MWException

If given invalid file.

Definition at line 50 of file JpegMetadataExtractor.php.

References $buffer, XMPReader\isSupported(), wfDebug(), and wfUnpack().

Referenced by BitmapMetadataHandler\Jpeg(), JpegMetadataExtractorTest\testBinaryCommentStripped(), JpegMetadataExtractorTest\testExifByteOrder(), ExifTest\testGPSExtraction(), JpegMetadataExtractorTest\testIPTCHashComparisionBadHash(), JpegMetadataExtractorTest\testIPTCHashComparisionGoodHash(), JpegMetadataExtractorTest\testIPTCHashComparisionNoHash(), JpegMetadataExtractorTest\testIso88591Comment(), JpegMetadataExtractorTest\testMultipleComment(), JpegMetadataExtractorTest\testPSIRExtraction(), ExifTest\testUnicodeUserComment(), JpegMetadataExtractorTest\testUtf8Comment(), JpegMetadataExtractorTest\testXMPExtraction(), and JpegMetadataExtractorTest\testXMPExtractionAltAppId().

Member Data Documentation

const JpegMetadataExtractor::MAX_JPEG_SEGMENTS = 200

Definition at line 33 of file JpegMetadataExtractor.php.

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The documentation for this class was generated from the following file:

• includes/media/JpegMetadataExtractor.php