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Cleanup debug and comments of r68324

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This commit is contained in:
Derk-Jan Hartman 2010-07-28 19:38:59 +00:00
parent bcd3dd1943
commit c66050d9e3
1 changed files with 9 additions and 9 deletions
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18
includes/media/PNGMetadataExtractor.php
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@ -1,7 +1,7 @@
<?php
/**
* PNG frame counter.
* Based on
* Slightly derived from GIFMetadataExtractor.php
* Deliberately not using MWExceptions to avoid external dependencies, encouraging
* redistribution.
*/
@ -19,41 +19,41 @@ class PNGMetadataExtractor {
$duration = 0.0;
if (!$filename)
throw new Exception( __METHOD__ . "No file name specified" );
throw new Exception( __METHOD__ . ": No file name specified" );
elseif ( !file_exists($filename) || is_dir($filename) )
throw new Exception( __METHOD__ . "File $filename does not exist" );
throw new Exception( __METHOD__ . ": File $filename does not exist" );
$fh = fopen( $filename, 'r' );
if (!$fh)
throw new Exception( __METHOD__ . "Unable to open file $filename" );
throw new Exception( __METHOD__ . ": Unable to open file $filename" );
// Check for the PNG header
$buf = fread( $fh, 8 );
if ( !($buf == self::$png_sig) ) {
throw new Exception( __METHOD__ . "Not a valid PNG file; header: $buf" );
throw new Exception( __METHOD__ . ": Not a valid PNG file; header: $buf" );
}
// Read chunks
while( !feof( $fh ) ) {
$buf = fread( $fh, 4 );
if( !$buf ) { throw new Exception( __METHOD__ . "Read error" ); return; }
if( !$buf ) { throw new Exception( __METHOD__ . ": Read error" ); return; }
$chunk_size = unpack( "N", $buf);
$chunk_size = $chunk_size[1];
$chunk_type = fread( $fh, 4 );
if( !$chunk_type ) { throw new Exception( __METHOD__ . "Read error" ); return; }
if( !$chunk_type ) { throw new Exception( __METHOD__ . ": Read error" ); return; }
if ( $chunk_type == "acTL" ) {
$buf = fread( $fh, $chunk_size );
if( !$buf ) { throw new Exception( __METHOD__ . "Read error" ); return; }
if( !$buf ) { throw new Exception( __METHOD__ . ": Read error" ); return; }
$actl = unpack( "Nframes/Nplays", $buf );
$frameCount = $actl['frames'];
$loopCount = $actl['plays'];
} elseif ( $chunk_type == "fcTL" ) {
$buf = fread( $fh, $chunk_size );
if( !$buf ) { throw new Exception( __METHOD__ . "Read error" ); return; }
if( !$buf ) { throw new Exception( __METHOD__ . ": Read error" ); return; }
$buf = substr( $buf, 20 );
$fctldur = unpack( "ndelay_num/ndelay_den", $buf );