Squashed 'mod/minify/' content from commit 5949018

git-subtree-dir: mod/minify
git-subtree-split: 594901859d5afc1fa364322428bd7a6d5c6a3f96

1 files changed, 326 insertions, 0 deletions

diff --git a/vendors/min/lib/HTTP/Encoder.php b/vendors/min/lib/HTTP/Encoder.php
new file mode 100644
index 000000000..66c26789c
--- /dev/null
+++ b/vendors/min/lib/HTTP/Encoder.php
@@ -0,0 +1,326 @@
+<?php
+/**
+ * Class HTTP_Encoder  
+ * @package Minify
+ * @subpackage HTTP
+ */
+ 
+/**
+ * Encode and send gzipped/deflated content
+ *
+ * The "Vary: Accept-Encoding" header is sent. If the client allows encoding, 
+ * Content-Encoding and Content-Length are added.
+ *
+ * <code>
+ * // Send a CSS file, compressed if possible
+ * $he = new HTTP_Encoder(array(
+ *     'content' => file_get_contents($cssFile)
+ *     ,'type' => 'text/css'
+ * ));
+ * $he->encode();
+ * $he->sendAll();
+ * </code>
+ *
+ * <code>
+ * // Shortcut to encoding output
+ * header('Content-Type: text/css'); // needed if not HTML
+ * HTTP_Encoder::output($css);
+ * </code>
+ * 
+ * <code>
+ * // Just sniff for the accepted encoding
+ * $encoding = HTTP_Encoder::getAcceptedEncoding();
+ * </code>
+ *
+ * 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 <steve@mrclay.org>
+ */
+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 = false;
+    
+    
+    /**
+     * 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 $spec options
+     * 
+     * 'content': (string required) content to be encoded
+     * 
+     * 'type': (string) if set, the Content-Type header will have this value.
+     * 
+     * 'method: (string) only set this if you are forcing a particular encoding
+     * method. If not set, the best method will be chosen by getAcceptedEncoding()
+     * The available methods are 'gzip', 'deflate', 'compress', and '' (no
+     * encoding)
+     * 
+     * @return null
+     */
+    public function __construct($spec) 

+    {
+        $this->_content = $spec['content'];
+        $this->_headers['Content-Length'] = (string)strlen($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.
+     * <code>
+     * array(
+     *     'Content-Length' => '615'
+     *     ,'Content-Encoding' => 'x-gzip'
+     *     ,'Vary' => 'Accept-Encoding'
+     * )
+     * </code>
+     *
+     * @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()
+     * 
+     * @return null
+     */
+    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.
+     * 
+     * @return null
+     */
+    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)

+    {
+        $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;
+        }
+        $this->_headers['Content-Length'] = strlen($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;
+    }

+    

+    protected $_content = '';
+    protected $_headers = array();
+    protected $_encodeMethod = array('', '');
+
+    /**
+     * Is the browser an IE version earlier than 6 SP2?  
+     */
+    protected static function _isBuggyIe()
+    {
+        $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);
+    }
+}