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<?php
/**
* @group Media
* @covers \PNGMetadataExtractor
*/
class PNGMetadataExtractorTest extends MediaWikiIntegrationTestCase {
private const FILE_PATH = __DIR__ . '/../../data/media/';
/**
* Tests zTXt tag (compressed textual metadata)
* @requires extension zlib
*/
public function testPngNativetZtxt() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
$expected = "foo bar baz foo foo foo foof foo foo foo foo";
$this->assertArrayHasKey( 'text', $meta );
$meta = $meta['text'];
$this->assertArrayHasKey( 'Make', $meta );
$this->assertArrayHasKey( 'x-default', $meta['Make'] );
$this->assertEquals( $expected, $meta['Make']['x-default'] );
}
/**
* Test tEXt tag (Uncompressed textual metadata)
*/
public function testPngNativeText() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
$expected = "Some long image desc";
$this->assertArrayHasKey( 'text', $meta );
$meta = $meta['text'];
$this->assertArrayHasKey( 'ImageDescription', $meta );
$this->assertArrayHasKey( 'x-default', $meta['ImageDescription'] );
$this->assertArrayHasKey( '_type', $meta['ImageDescription'] );
$this->assertEquals( $expected, $meta['ImageDescription']['x-default'] );
}
/**
* tEXt tags must be encoded iso-8859-1 (vs iTXt which are utf-8)
* Make sure non-ascii characters get converted properly
*/
public function testPngNativeTextNonAscii() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
// Note the Copyright symbol here is a utf-8 one
// (aka \xC2\xA9) where in the file its iso-8859-1
// encoded as just \xA9.
$expected = "© 2010 Bawolff";
$this->assertArrayHasKey( 'text', $meta );
$meta = $meta['text'];
$this->assertArrayHasKey( 'Copyright', $meta );
$this->assertArrayHasKey( 'x-default', $meta['Copyright'] );
$this->assertEquals( $expected, $meta['Copyright']['x-default'] );
}
/**
* Given a normal static PNG, check the animation metadata returned.
*/
public function testStaticPngAnimationMetadata() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
$this->assertSame( 0, $meta['frameCount'] );
$this->assertSame( 1, $meta['loopCount'] );
$this->assertSame( 0.0, $meta['duration'] );
}
/**
* Given an animated APNG image file
* check it gets animated metadata right.
*/
public function testApngAnimationMetadata() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Animated_PNG_example_bouncing_beach_ball.png' );
$this->assertEquals( 20, $meta['frameCount'] );
// Note loop count of 0 = infinity
$this->assertSame( 0, $meta['loopCount'] );
$this->assertEqualsWithDelta( 1.5, $meta['duration'], 0.00001, '' );
}
public function testPngBitDepth8() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
$this->assertEquals( 8, $meta['bitDepth'] );
}
public function testPngBitDepth1() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'1bit-png.png' );
$this->assertSame( 1, $meta['bitDepth'] );
}
public function testPngIndexColour() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'Png-native-test.png' );
$this->assertEquals( 'index-coloured', $meta['colorType'] );
}
public function testPngRgbColour() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'rgb-png.png' );
$this->assertEquals( 'truecolour-alpha', $meta['colorType'] );
}
public function testPngRgbNoAlphaColour() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'rgb-na-png.png' );
$this->assertEquals( 'truecolour', $meta['colorType'] );
}
public function testPngGreyscaleColour() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'greyscale-png.png' );
$this->assertEquals( 'greyscale-alpha', $meta['colorType'] );
}
public function testPngGreyscaleNoAlphaColour() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'greyscale-na-png.png' );
$this->assertEquals( 'greyscale', $meta['colorType'] );
}
/**
* T286273 -- tEXt chunk replaced by null bytes
*/
public function testPngInvalidChunk() {
$meta = PNGMetadataExtractor::getMetadata( self::FILE_PATH .
'tEXt-invalid-masked.png' );
$this->assertEquals( 10, $meta['width'] );
$this->assertEquals( 10, $meta['height'] );
}
/**
* T286273 -- oversize chunk
*/
public function testPngOversizeChunk() {
// Write a temporary file consisting of a normal PNG plus an extra tEXt chunk.
// Try to hold the chunk in memory only once.
$path = $this->getNewTempFile();
copy( self::FILE_PATH . '1bit-png.png', $path );
$chunkTypeAndData = "tEXtkey\0value" . str_repeat( '.', 10000000 );
$crc = crc32( $chunkTypeAndData );
$chunkLength = strlen( $chunkTypeAndData ) - 4;
$file = fopen( $path, 'r+' );
fseek( $file, -12, SEEK_END );
$iend = fread( $file, 12 );
fseek( $file, -12, SEEK_END );
fwrite( $file, pack( 'N', $chunkLength ) );
fwrite( $file, $chunkTypeAndData );
fwrite( $file, pack( 'N', $crc ) );
fwrite( $file, $iend );
fclose( $file );
// Extract the metadata
$meta = PNGMetadataExtractor::getMetadata( $path );
$this->assertEquals( 50, $meta['width'] );
$this->assertEquals( 50, $meta['height'] );
// Verify that the big chunk didn't end up in the metadata
$this->assertLessThan( 100000, strlen( serialize( $meta ) ) );
}
}
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