GIFMetadataExtractor Class Reference

GIF frame counter. More...

Collaboration diagram for GIFMetadataExtractor:

Static Public Member Functions
static	decodeBPP ( $data)
static	getMetadata ( $filename)
static	readBlock ( $fh, $includeLengths=false)
	Read a block.
static	readGCT ( $fh, $bpp)
static	skipBlock ( $fh)

Public Attributes
const	MAX_SUBBLOCKS = 262144
const	VERSION = 1

Static Private Attributes
static string	$gifExtensionSep
static string	$gifFrameSep
static string	$gifTerm

Detailed Description

GIF frame counter.

Definition at line 34 of file GIFMetadataExtractor.php.

Member Function Documentation

decodeBPP()

static GIFMetadataExtractor::decodeBPP ( $data )

static

Parameters

string

$data

Exceptions

Exception

Returns

int

Definition at line 279 of file GIFMetadataExtractor.php.

Referenced by getMetadata().

getMetadata()

static GIFMetadataExtractor::getMetadata ( $filename )

static

Exceptions

Exception

Parameters

string

$filename

Returns

array

Definition at line 56 of file GIFMetadataExtractor.php.

References $term, decodeBPP(), readBlock(), readGCT(), skipBlock(), and wfDebug().

Referenced by BitmapMetadataHandler\GIF(), and GIFMetadataExtractorTest\testGetMetadata().

readBlock()

static GIFMetadataExtractor::readBlock ( $fh, $includeLengths = false )

static

Read a block.

In the GIF format, a block is made up of several sub-blocks. Each sub block starts with one byte saying how long the sub-block is, followed by the sub-block. The entire block is terminated by a sub-block of length 0.

Parameters

resource	$fh	File handle
bool	$includeLengths	Include the length bytes of the sub-blocks in the returned value. Normally this is false, except XMP is weird and does a hack where you need to keep these length bytes.

Exceptions

Exception

Returns

string The data.

Definition at line 324 of file GIFMetadataExtractor.php.

Referenced by getMetadata().

readGCT()

static GIFMetadataExtractor::readGCT ( $fh, $bpp )

static

Parameters

resource	$fh
int	$bpp

Returns

void

Definition at line 265 of file GIFMetadataExtractor.php.

Referenced by getMetadata().

skipBlock()

static GIFMetadataExtractor::skipBlock ( $fh )

static

Parameters

resource

$fh

Exceptions

Exception

Definition at line 296 of file GIFMetadataExtractor.php.

Referenced by getMetadata().

Member Data Documentation

$gifExtensionSep

string GIFMetadataExtractor::$gifExtensionSep

staticprivate

Definition at line 39 of file GIFMetadataExtractor.php.

$gifFrameSep

string GIFMetadataExtractor::$gifFrameSep

staticprivate

Definition at line 36 of file GIFMetadataExtractor.php.

$gifTerm

string GIFMetadataExtractor::$gifTerm

staticprivate

Definition at line 42 of file GIFMetadataExtractor.php.

MAX_SUBBLOCKS

const GIFMetadataExtractor::MAX_SUBBLOCKS = 262144

Definition at line 49 of file GIFMetadataExtractor.php.

VERSION

const GIFMetadataExtractor::VERSION = 1

Definition at line 44 of file GIFMetadataExtractor.php.

Referenced by BitmapMetadataHandler\GIF(), and GIFHandler\isMetadataValid().

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

• includes/media/GIFMetadataExtractor.php