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* // Send a CSS file, compressed if possible * $he = new HTTP_Encoder(array( * 'content' => file_get_contents($cssFile) * ,'type' => 'text/css' * )); * $he->encode(); * $he->sendAll(); * * * * // Shortcut to encoding output * header('Content-Type: text/css'); // needed if not HTML * HTTP_Encoder::output($css); * * * * // Just sniff for the accepted encoding * $encoding = HTTP_Encoder::getAcceptedEncoding(); * * * For more control over headers, use getHeaders() and getData() and send your * own output. * * Note: If you don't need header mgmt, use PHP's native gzencode, gzdeflate, * and gzcompress functions for gzip, deflate, and compress-encoding * respectively. * * @package Minify * @subpackage HTTP * @author Stephen Clay */ class HTTP_Encoder { /** * Should the encoder allow HTTP encoding to IE6? * * If you have many IE6 users and the bandwidth savings is worth troubling * some of them, set this to true. * * By default, encoding is only offered to IE7+. When this is true, * getAcceptedEncoding() will return an encoding for IE6 if its user agent * string contains "SV1". This has been documented in many places as "safe", * but there seem to be remaining, intermittent encoding bugs in patched * IE6 on the wild web. * * @var bool */ public static $encodeToIe6 = true; /** * Default compression level for zlib operations * * This level is used if encode() is not given a $compressionLevel * * @var int */ public static $compressionLevel = 6; /** * Get an HTTP Encoder object * * @param array $spec options * * 'content': (string required) content to be encoded * * 'type': (string) if set, the Content-Type header will have this value. * * 'method: (string) only set this if you are forcing a particular encoding * method. If not set, the best method will be chosen by getAcceptedEncoding() * The available methods are 'gzip', 'deflate', 'compress', and '' (no * encoding) */ public function __construct($spec) { $this->_useMbStrlen = (function_exists('mb_strlen') && (ini_get('mbstring.func_overload') !== '') && ((int)ini_get('mbstring.func_overload') & 2)); $this->_content = $spec['content']; $this->_headers['Content-Length'] = $this->_useMbStrlen ? (string)mb_strlen($this->_content, '8bit') : (string)strlen($this->_content); if (isset($spec['type'])) { $this->_headers['Content-Type'] = $spec['type']; } if (isset($spec['method']) && in_array($spec['method'], array('gzip', 'deflate', 'compress', ''))) { $this->_encodeMethod = array($spec['method'], $spec['method']); } else { $this->_encodeMethod = self::getAcceptedEncoding(); } } /** * Get content in current form * * Call after encode() for encoded content. * * @return string */ public function getContent() { return $this->_content; } /** * Get array of output headers to be sent * * E.g. * * array( * 'Content-Length' => '615' * ,'Content-Encoding' => 'x-gzip' * ,'Vary' => 'Accept-Encoding' * ) * * * @return array */ public function getHeaders() { return $this->_headers; } /** * Send output headers * * You must call this before headers are sent and it probably cannot be * used in conjunction with zlib output buffering / mod_gzip. Errors are * not handled purposefully. * * @see getHeaders() */ public function sendHeaders() { foreach ($this->_headers as $name => $val) { header($name . ': ' . $val); } } /** * Send output headers and content * * A shortcut for sendHeaders() and echo getContent() * * You must call this before headers are sent and it probably cannot be * used in conjunction with zlib output buffering / mod_gzip. Errors are * not handled purposefully. */ public function sendAll() { $this->sendHeaders(); echo $this->_content; } /** * Determine the client's best encoding method from the HTTP Accept-Encoding * header. * * If no Accept-Encoding header is set, or the browser is IE before v6 SP2, * this will return ('', ''), the "identity" encoding. * * A syntax-aware scan is done of the Accept-Encoding, so the method must * be non 0. The methods are favored in order of gzip, deflate, then * compress. Deflate is always smallest and generally faster, but is * rarely sent by servers, so client support could be buggier. * * @param bool $allowCompress allow the older compress encoding * * @param bool $allowDeflate allow the more recent deflate encoding * * @return array two values, 1st is the actual encoding method, 2nd is the * alias of that method to use in the Content-Encoding header (some browsers * call gzip "x-gzip" etc.) */ public static function getAcceptedEncoding($allowCompress = true, $allowDeflate = true) { // @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html if (! isset($_SERVER['HTTP_ACCEPT_ENCODING']) || self::isBuggyIe()) { return array('', ''); } $ae = $_SERVER['HTTP_ACCEPT_ENCODING']; // gzip checks (quick) if (0 === strpos($ae, 'gzip,') // most browsers || 0 === strpos($ae, 'deflate, gzip,') // opera ) { return array('gzip', 'gzip'); } // gzip checks (slow) if (preg_match( '@(?:^|,)\\s*((?:x-)?gzip)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae, $m )) { return array('gzip', $m[1]); } if ($allowDeflate) { // deflate checks $aeRev = strrev($ae); if (0 === strpos($aeRev, 'etalfed ,') // ie, webkit || 0 === strpos($aeRev, 'etalfed,') // gecko || 0 === strpos($ae, 'deflate,') // opera // slow parsing || preg_match( '@(?:^|,)\\s*deflate\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae )) { return array('deflate', 'deflate'); } } if ($allowCompress && preg_match( '@(?:^|,)\\s*((?:x-)?compress)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae, $m )) { return array('compress', $m[1]); } return array('', ''); } /** * Encode (compress) the content * * If the encode method is '' (none) or compression level is 0, or the 'zlib' * extension isn't loaded, we return false. * * Then the appropriate gz_* function is called to compress the content. If * this fails, false is returned. * * The header "Vary: Accept-Encoding" is added. If encoding is successful, * the Content-Length header is updated, and Content-Encoding is also added. * * @param int $compressionLevel given to zlib functions. If not given, the * class default will be used. * * @return bool success true if the content was actually compressed */ public function encode($compressionLevel = null) { if (! self::isBuggyIe()) { $this->_headers['Vary'] = 'Accept-Encoding'; } if (null === $compressionLevel) { $compressionLevel = self::$compressionLevel; } if ('' === $this->_encodeMethod[0] || ($compressionLevel == 0) || !extension_loaded('zlib')) { return false; } if ($this->_encodeMethod[0] === 'deflate') { $encoded = gzdeflate($this->_content, $compressionLevel); } elseif ($this->_encodeMethod[0] === 'gzip') { $encoded = gzencode($this->_content, $compressionLevel); } else { $encoded = gzcompress($this->_content, $compressionLevel); } if (false === $encoded) { return false; } $this->_headers['Content-Length'] = $this->_useMbStrlen ? (string)mb_strlen($encoded, '8bit') : (string)strlen($encoded); $this->_headers['Content-Encoding'] = $this->_encodeMethod[1]; $this->_content = $encoded; return true; } /** * Encode and send appropriate headers and content * * This is a convenience method for common use of the class * * @param string $content * * @param int $compressionLevel given to zlib functions. If not given, the * class default will be used. * * @return bool success true if the content was actually compressed */ public static function output($content, $compressionLevel = null) { if (null === $compressionLevel) { $compressionLevel = self::$compressionLevel; } $he = new HTTP_Encoder(array('content' => $content)); $ret = $he->encode($compressionLevel); $he->sendAll(); return $ret; } /** * Is the browser an IE version earlier than 6 SP2? * * @return bool */ public static function isBuggyIe() { if (empty($_SERVER['HTTP_USER_AGENT'])) { return false; } $ua = $_SERVER['HTTP_USER_AGENT']; // quick escape for non-IEs if (0 !== strpos($ua, 'Mozilla/4.0 (compatible; MSIE ') || false !== strpos($ua, 'Opera')) { return false; } // no regex = faaast $version = (float)substr($ua, 30); return self::$encodeToIe6 ? ($version < 6 || ($version == 6 && false === strpos($ua, 'SV1'))) : ($version < 7); } protected $_content = ''; protected $_headers = array(); protected $_encodeMethod = array('', ''); protected $_useMbStrlen = false; }