diff options
Diffstat (limited to 'includes/media/GIFMetadataExtractor.php')
| -rw-r--r-- | includes/media/GIFMetadataExtractor.php | 46 |
1 files changed, 24 insertions, 22 deletions
diff --git a/includes/media/GIFMetadataExtractor.php b/includes/media/GIFMetadataExtractor.php index 5fc5c1a7..6a4e753d 100644 --- a/includes/media/GIFMetadataExtractor.php +++ b/includes/media/GIFMetadataExtractor.php @@ -49,16 +49,16 @@ class GIFMetadataExtractor { * @return array */ static function getMetadata( $filename ) { - self::$gif_frame_sep = pack( "C", ord("," ) ); - self::$gif_extension_sep = pack( "C", ord("!" ) ); - self::$gif_term = pack( "C", ord(";" ) ); + self::$gif_frame_sep = pack( "C", ord( "," ) ); + self::$gif_extension_sep = pack( "C", ord( "!" ) ); + self::$gif_term = pack( "C", ord( ";" ) ); $frameCount = 0; $duration = 0.0; $isLooped = false; $xmp = ""; $comment = array(); - + if ( !$filename ) { throw new Exception( "No file name specified" ); } elseif ( !file_exists( $filename ) || is_dir( $filename ) ) { @@ -73,7 +73,7 @@ class GIFMetadataExtractor { // Check for the GIF header $buf = fread( $fh, 6 ); - if ( !($buf == 'GIF87a' || $buf == 'GIF89a') ) { + if ( !( $buf == 'GIF87a' || $buf == 'GIF89a' ) ) { throw new Exception( "Not a valid GIF file; header: $buf" ); } @@ -93,7 +93,7 @@ class GIFMetadataExtractor { while( !feof( $fh ) ) { $buf = fread( $fh, 1 ); - if ($buf == self::$gif_frame_sep) { + if ( $buf == self::$gif_frame_sep ) { // Found a frame $frameCount++; @@ -107,14 +107,14 @@ class GIFMetadataExtractor { ## Read GCT self::readGCT( $fh, $bpp ); fread( $fh, 1 ); - self::skipBlock( $fh ); + self::skipBlock( $fh ); } elseif ( $buf == self::$gif_extension_sep ) { $buf = fread( $fh, 1 ); if ( strlen( $buf ) < 1 ) throw new Exception( "Ran out of input" ); $extension_code = unpack( 'C', $buf ); $extension_code = $extension_code[1]; - if ($extension_code == 0xF9) { + if ( $extension_code == 0xF9 ) { // Graphics Control Extension. fread( $fh, 1 ); // Block size @@ -132,10 +132,10 @@ class GIFMetadataExtractor { if ( strlen( $term ) < 1 ) throw new Exception( "Ran out of input" ); $term = unpack( 'C', $term ); $term = $term[1]; - if ($term != 0 ) { + if ( $term != 0 ) { throw new Exception( "Malformed Graphics Control Extension block" ); } - } elseif ($extension_code == 0xFE) { + } elseif ( $extension_code == 0xFE ) { // Comment block(s). $data = self::readBlock( $fh ); if ( $data === "" ) { @@ -164,7 +164,7 @@ class GIFMetadataExtractor { // is identical to the last, only extract once. $comment[] = $data; } - } elseif ($extension_code == 0xFF) { + } elseif ( $extension_code == 0xFF ) { // Application extension (Netscape info about the animated gif) // or XMP (or theoretically any other type of extension block) $blockLength = fread( $fh, 1 ); @@ -173,7 +173,7 @@ class GIFMetadataExtractor { $blockLength = $blockLength[1]; $data = fread( $fh, $blockLength ); - if ($blockLength != 11 ) { + if ( $blockLength != 11 ) { wfDebug( __METHOD__ . ' GIF application block with wrong length' ); fseek( $fh, -($blockLength + 1), SEEK_CUR ); self::skipBlock( $fh ); @@ -182,23 +182,22 @@ class GIFMetadataExtractor { // NETSCAPE2.0 (application name for animated gif) if ( $data == 'NETSCAPE2.0' ) { - $data = fread( $fh, 2 ); // Block length and introduction, should be 03 01 - if ($data != "\x03\x01") { + if ( $data != "\x03\x01" ) { throw new Exception( "Expected \x03\x01, got $data" ); } - + // Unsigned little-endian integer, loop count or zero for "forever" $loopData = fread( $fh, 2 ); if ( strlen( $loopData ) < 2 ) throw new Exception( "Ran out of input" ); $loopData = unpack( 'v', $loopData ); $loopCount = $loopData[1]; - - if ($loopCount != 1) { + + if ( $loopCount != 1 ) { $isLooped = true; } - + // Read out terminator byte fread( $fh, 1 ); } elseif ( $data == 'XMP DataXMP' ) { @@ -232,7 +231,7 @@ class GIFMetadataExtractor { if ( strlen( $buf ) < 1 ) throw new Exception( "Ran out of input" ); $byte = unpack( 'C', $buf ); $byte = $byte[1]; - throw new Exception( "At position: ".ftell($fh). ", Unknown byte ".$byte ); + throw new Exception( "At position: " . ftell( $fh ) . ", Unknown byte " . $byte ); } } @@ -252,7 +251,7 @@ class GIFMetadataExtractor { */ static function readGCT( $fh, $bpp ) { if ( $bpp > 0 ) { - for( $i=1; $i<=pow( 2, $bpp ); ++$i ) { + for( $i = 1; $i <= pow( 2, $bpp ); ++$i ) { fread( $fh, 3 ); } } @@ -260,6 +259,7 @@ class GIFMetadataExtractor { /** * @param $data + * @throws Exception * @return int */ static function decodeBPP( $data ) { @@ -276,7 +276,7 @@ class GIFMetadataExtractor { /** * @param $fh - * @return + * @throws Exception */ static function skipBlock( $fh ) { while ( !feof( $fh ) ) { @@ -284,12 +284,13 @@ class GIFMetadataExtractor { if ( strlen( $buf ) < 1 ) throw new Exception( "Ran out of input" ); $block_len = unpack( 'C', $buf ); $block_len = $block_len[1]; - if ($block_len == 0) { + if ( $block_len == 0 ) { return; } fread( $fh, $block_len ); } } + /** * Read a block. In the GIF format, a block is made up of * several sub-blocks. Each sub block starts with one byte @@ -301,6 +302,7 @@ class GIFMetadataExtractor { * 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. + * @throws Exception * @return string The data. */ static function readBlock( $fh, $includeLengths = false ) { |