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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 34 of file JpegMetadataExtractor.php.

Member Function Documentation

◆ doPSIR()

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$app13Photoshop 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 209 of file JpegMetadataExtractor.php.

References wfUnpack().

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

◆ jpegExtractMarker()

static JpegMetadataExtractor::jpegExtractMarker ( $fh)
staticprivate

Helper function for jpegSegmentSplitter.

Parameters
resource&$fhFile handle for JPEG file
Exceptions
MWException
Returns
string Data content of segment.

Definition at line 178 of file JpegMetadataExtractor.php.

References wfUnpack().

◆ segmentSplitter()

Member Data Documentation

◆ MAX_JPEG_SEGMENTS

const JpegMetadataExtractor::MAX_JPEG_SEGMENTS = 200

Definition at line 35 of file JpegMetadataExtractor.php.


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