TYPO3core 3.7.0 dev: gzip_encode Class Reference

00150                                                                                {
00151    if (!function_exists('gzcompress')) {
00152        trigger_error('gzcompress not found, ' .
00153           'zlib needs to be installed for gzip_encode',
00154           E_USER_WARNING);
00155        return;
00156    }
00157    if (!function_exists('crc32')) {
00158        trigger_error('crc32() not found, ' .
00159           'PHP >= 4.0.1 needed for gzip_encode', E_USER_WARNING);
00160        return;
00161    }
00162    if (headers_sent()) return;
00163    if (connection_status() !== 0) return;
00164    $encoding = $this->gzip_accepted();
00165    if (!$encoding) return;
00166    $this->encoding = $encoding;
00167 
00168    if ($level === true) {
00169        $level = $this->get_complevel();
00170    }
00171    $this->level = $level;
00172 
00173    $contents = ob_get_contents();
00174    if ($contents === false) return;
00175 
00176    $gzdata = "\x1f\x8b\x08\x00\x00\x00\x00\x00"; // gzip header
00177 
00178       // By Kasper Skaarhoj, start
00179    if ($outputCompressedSizes)   {
00180       $contents.=chr(10)."<!-- Compressed, level ".$level.", original size was ".strlen($contents)." bytes. New size is ".strlen(gzcompress($contents, $level))." bytes -->";
00181       $size = strlen($contents); // Must set again!
00182    }
00183       // By Kasper Skaarhoj, end
00184 
00185    $size = strlen($contents);
00186    $crc = crc32($contents);
00187    $gzdata .= gzcompress($contents, $level);
00188    $gzdata = substr($gzdata, 0, strlen($gzdata) - 4); // fix crc bug
00189    $gzdata .= pack("V",$crc) . pack("V", $size);
00190 
00191    $this->size = $size;
00192    $this->crc = $crc;
00193    $this->gzsize = strlen($gzdata);
00194 
00195    if ($debug) {
00196        return;
00197    }
00198 
00199    ob_end_clean();
00200    Header('Content-Encoding: ' . $encoding);
00201    Header('Content-Length: ' . strlen($gzdata));
00202    Header('X-Content-Encoded-By: class.gzip_encode '.$this->_version);
00203 
00204    echo $gzdata;
00205     }

00309                                {
00310    $buffer= `uptime`;
00311    ereg("averag(es|e): ([0-9][.][0-9][0-9]), ([0-9][.][0-9][0-9]), ([0-9][.][0-9][0-9]*)", $buffer, $load);
00312 
00313    return max((float)$load[2], (float)$load[3], (float)$load[4]);
00314     }

00267                              {
00268    $uname = posix_uname();
00269    switch ($uname['sysname']) {
00270        case 'Linux':
00271       $cl = (1 - $this->linux_loadavg()) * 10;
00272       $level = (int)max(min(9, $cl), 0);
00273       break;
00274        case 'FreeBSD':
00275       $cl = (1 - $this->freebsd_loadavg()) * 10;
00276       $level = (int)max(min(9, $cl), 0);
00277       break;
00278        default:
00279       $level = 3;
00280       break;
00281    }
00282    return $level;
00283     }

00222                              {
00223    if (strpos(getenv("HTTP_ACCEPT_ENCODING"), 'gzip') === false) return false;
00224    if (strpos(getenv("HTTP_ACCEPT_ENCODING"), 'x-gzip') === false) {
00225        $encoding = 'gzip';
00226    } else {
00227        $encoding = 'x-gzip';
00228    }
00229 
00230    // Test file type. I wish I could get HTTP response headers.
00231    $magic = substr(ob_get_contents(),0,4);
00232    if (substr($magic,0,2) === '^_') {
00233        // gzip data
00234        $encoding = false;
00235    } else if (substr($magic,0,3) === 'GIF') {
00236        // gif images
00237        $encoding = false;
00238    } else if (substr($magic,0,2) === "\xFF\xD8") {
00239        // jpeg images
00240        $encoding = false;
00241    } else if (substr($magic,0,4) === "\x89PNG") {
00242        // png images
00243        $encoding = false;
00244    } else if (substr($magic,0,3) === 'FWS') {
00245        // Don't gzip Shockwave Flash files. Flash on windows incorrectly
00246        // claims it accepts gzip'd content.
00247        $encoding = false;
00248    } else if (substr($magic,0,2) === 'PK') {
00249        // pk zip file
00250        $encoding = false;
00251    }
00252 
00253    return $encoding;
00254     }

00290                              {
00291    $buffer = "0 0 0";
00292    $f = fopen("/proc/loadavg","rb");
00293    if (!feof($f)) {
00294        $buffer = fgets($f, 1024);
00295    }
00296    fclose($f);
00297    $load = explode(" ",$buffer);
00298    return max((float)$load[0], (float)$load[1], (float)$load[2]);
00299     }


Public Member Functions
	gzip_encode ($level=3, $debug=false, $outputCompressedSizes=0)
	gzip_accepted ()
	get_complevel ()
	linux_loadavg ()
	freebsd_loadavg ()
Public Attributes
	$_version = 0.66
	$level
	$encoding
	$crc
	$size
	$gzsize

gzip_encode Class Reference

Public Member Functions

Public Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation