JpegMetadataExtractor Class Reference

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

List of all members.

Static Public Member Functions
static	doPSIR ($app13)
	This reads the photoshop image resource.
static	segmentSplitter ($filename)
	Function to extract metadata segments of interest from jpeg files based on GIFMetadataExtractor.
Public Attributes
const	MAX_JPEG_SEGMENTS = 200
Static Private Member Functions
static	jpegExtractMarker (&$fh)
	Helper function for jpegSegmentSplitter.

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Detailed Description

Class for reading jpegs and extracting metadata.

see also BitmapMetadataHandler.

Based somewhat on GIFMetadataExtractor.

Definition at line 32 of file JpegMetadataExtractor.php.

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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.

Definition at line 200 of file JpegMetadataExtractor.php.

References wfUnpack().

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

static JpegMetadataExtractor::jpegExtractMarker

(

&$

fh

)

[static, private]

Helper function for jpegSegmentSplitter.

Parameters:

&$fh	FileHandle for jpeg file

Exceptions:

MWException

Returns:

string data content of segment.

Definition at line 175 of file JpegMetadataExtractor.php.

References $size, and wfUnpack().

Referenced by segmentSplitter().

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 of interesting segments.

Exceptions:

MWException

if given invalid file.

Definition at line 50 of file JpegMetadataExtractor.php.

References $size, array(), jpegExtractMarker(), UtfNormal\quickIsNFCVerify(), wfDebug(), wfRestoreWarnings(), wfSuppressWarnings(), 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().

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Member Data Documentation

const JpegMetadataExtractor::MAX_JPEG_SEGMENTS = 200

Definition at line 34 of file JpegMetadataExtractor.php.

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

• includes/media/JpegMetadataExtractor.php