Created
October 7, 2018 16:08
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| /* | |
| * Load local files and stream it chunked | |
| * Tested also with media and large files | |
| */ | |
| function stream_file( $file, $is_resume = true ) | |
| { | |
| //First, see if the file exists | |
| if (!is_file($file)) | |
| { | |
| header('HTTP/1.0 404 Not found'); | |
| die("File not found"); | |
| } | |
| //Gather relevent info about file | |
| $size = filesize($file); | |
| $fileinfo = pathinfo($file); | |
| $chunk_length = $size; | |
| //workaround for IE filename bug with multiple periods / multiple dots in filename | |
| //that adds square brackets to filename - eg. setup.abc.exe becomes setup[1].abc.exe | |
| $filename = (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) ? | |
| preg_replace('/\./', '%2e', $fileinfo['basename'], substr_count($fileinfo['basename'], '.') - 1) : | |
| $fileinfo['basename']; | |
| // get mime type | |
| $finfo = finfo_open( FILEINFO_MIME_TYPE ); | |
| $mime_type = finfo_file( $finfo, $file ); | |
| finfo_close( $finfo ); | |
| //check if http_range is sent by browser (or download manager) | |
| if($is_resume && isset( $_SERVER['HTTP_RANGE'] ) ) | |
| { | |
| list( $size_unit, $range_orig ) = explode( '=', $_SERVER['HTTP_RANGE'], 2 ); | |
| if( $size_unit == 'bytes' ) | |
| { | |
| //multiple ranges could be specified at the same time, but for simplicity only serve the first range | |
| //http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt | |
| list( $range, $extra_ranges ) = explode( ',', $range_orig, 2 ); | |
| } | |
| else | |
| { | |
| $range = ''; | |
| } | |
| //figure out download piece from range (if set) | |
| list( $seek_start, $seek_end ) = explode( '-', $range, 2 ); | |
| } else { | |
| $range = ''; | |
| } | |
| //set start and end based on range (if set), else set defaults | |
| //also check for invalid ranges. | |
| $seek_end = ( empty( $seek_end ) ) ? ($size - 1) : min(abs( intval( $seek_end ) ), ( $size - 1 ) ); | |
| $seek_start = ( empty( $seek_start ) || $seek_end < abs( intval( $seek_start ) ) ) ? 0 : max( abs( intval( $seek_start ) ), 0 ); | |
| //add headers if resumable | |
| if( $is_resume ) | |
| { | |
| //Only send partial content header if downloading a piece of the file (IE workaround) | |
| if( !empty( $seek_start ) || $seek_end < ( $size - 1 ) ) | |
| header('HTTP/1.1 206 Partial Content' ); | |
| else | |
| header('HTTP/1.0 200 OK' ); | |
| header( 'Accept-Ranges: bytes' ); | |
| header( 'Content-Range: bytes ' . $seek_start . '-' . $seek_end . '/' . $size ); | |
| $chunk_length = $seek_end - $seek_start + 1; | |
| } | |
| if( !empty( $_REQUEST['download'] ) ) | |
| { | |
| header( "Content-Disposition: attachment; filename=" . urlencode( basename( $file ) ) ); | |
| header( "Content-Type: application/download" ); | |
| header( "Content-Description: File Transfer" ); | |
| header( "Content-Length: " . $chunk_length ); | |
| } else { | |
| header("Content-Type: " . $mime_type ); | |
| header("Content-Length: ". $chunk_length ); | |
| } | |
| //open the file | |
| $fp = fopen( $file, 'rb' ); | |
| //seek to start of missing part | |
| fseek( $fp, $seek_start ); | |
| //start buffered download | |
| while( !feof( $fp ) ) | |
| { | |
| //reset time limit for big files | |
| set_time_limit( 0 ); | |
| print( fread( $fp, 1024*8 ) ); | |
| flush(); | |
| ob_flush(); | |
| } | |
| fclose( $fp ); | |
| exit; | |
| } |
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