HTTP_Encoder::getAcceptedEncoding PHP 메소드

    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,') || 0 === strpos($ae, 'deflate, gzip,')) {
            return array('gzip', 'gzip');
        }
        // gzip checks (slow)
        if (preg_match('@(?:^|,)\\s*((?:x-)?gzip)\\s*(?:$|,|;\\s*q=(?:0\\.|1))@', $ae, $m)) {
            return array('gzip', $m[1]);
        }
        if ($allowDeflate) {
            // deflate checks
            $aeRev = strrev($ae);
            if (0 === strpos($aeRev, 'etalfed ,') || 0 === strpos($aeRev, 'etalfed,') || 0 === strpos($ae, 'deflate,') || preg_match('@(?:^|,)\\s*deflate\\s*(?:$|,|;\\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('', '');
    }

function test_HTTP_Encoder()
{
    global $thisDir;
    HTTP_Encoder::$encodeToIe6 = true;
    $methodTests = array(array('ua' => 'Any browser', 'ae' => 'compress, x-gzip', 'exp' => array('gzip', 'x-gzip'), 'desc' => 'recognize "x-gzip" as gzip'), array('ua' => 'Any browser', 'ae' => 'compress, x-gzip;q=0.5', 'exp' => array('gzip', 'x-gzip'), 'desc' => 'gzip w/ non-zero q'), array('ua' => 'Any browser', 'ae' => 'compress, x-gzip;q=0', 'exp' => array('compress', 'compress'), 'desc' => 'gzip w/ zero q'), array('ua' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)', 'ae' => 'gzip, deflate', 'exp' => array('', ''), 'desc' => 'IE6 w/o "enhanced security"'), array('ua' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)', 'ae' => 'gzip, deflate', 'exp' => array('deflate', 'deflate'), 'desc' => 'IE6 w/ "enhanced security"'), array('ua' => 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT 5.01)', 'ae' => 'gzip, deflate', 'exp' => array('', ''), 'desc' => 'IE5.5'), array('ua' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; en) Opera 9.25', 'ae' => 'gzip,deflate', 'exp' => array('deflate', 'deflate'), 'desc' => 'Opera identifying as IE6'));
    foreach ($methodTests as $test) {
        $_SERVER['HTTP_USER_AGENT'] = $test['ua'];
        $_SERVER['HTTP_ACCEPT_ENCODING'] = $test['ae'];
        $exp = $test['exp'];
        $ret = HTTP_Encoder::getAcceptedEncoding();
        $passed = assertTrue($exp == $ret, 'HTTP_Encoder : ' . $test['desc']);
        if (__FILE__ === realpath($_SERVER['SCRIPT_FILENAME'])) {
            echo "\n--- AE | UA = {$test['ae']} | {$test['ua']}\n";
            echo "Expected = " . preg_replace('/\\s+/', ' ', var_export($exp, 1)) . "\n";
            echo "Returned = " . preg_replace('/\\s+/', ' ', var_export($ret, 1)) . "\n\n";
        }
    }
    HTTP_Encoder::$encodeToIe6 = false;
    $methodTests = array(array('ua' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)', 'ae' => 'gzip, deflate', 'exp' => array('', ''), 'desc' => 'IE6 w/ "enhanced security"'));
    foreach ($methodTests as $test) {
        $_SERVER['HTTP_USER_AGENT'] = $test['ua'];
        $_SERVER['HTTP_ACCEPT_ENCODING'] = $test['ae'];
        $exp = $test['exp'];
        $ret = HTTP_Encoder::getAcceptedEncoding();
        $passed = assertTrue($exp == $ret, 'HTTP_Encoder : ' . $test['desc']);
        if (__FILE__ === realpath($_SERVER['SCRIPT_FILENAME'])) {
            echo "\n--- AE | UA = {$test['ae']} | {$test['ua']}\n";
            echo "Expected = " . preg_replace('/\\s+/', ' ', var_export($exp, 1)) . "\n";
            echo "Returned = " . preg_replace('/\\s+/', ' ', var_export($ret, 1)) . "\n\n";
        }
    }
    if (!function_exists('gzdeflate')) {
        echo "!WARN: HTTP_Encoder : Zlib support is not present in PHP. Encoding cannot be performed/tested.\n";
        return;
    }
    // test compression of varied content (HTML,JS, & CSS)
    $variedContent = file_get_contents($thisDir . '/_test_files/html/before.html') . file_get_contents($thisDir . '/_test_files/css/subsilver.css') . file_get_contents($thisDir . '/_test_files/js/jquery-1.2.3.js');
    $variedLength = strlen($variedContent);
    $encodingTests = array(array('method' => 'deflate', 'inv' => 'gzinflate', 'exp' => 32157), array('method' => 'gzip', 'inv' => '_gzdecode', 'exp' => 32175), array('method' => 'compress', 'inv' => 'gzuncompress', 'exp' => 32211));
    foreach ($encodingTests as $test) {
        $e = new HTTP_Encoder(array('content' => $variedContent, 'method' => $test['method']));
        $e->encode(9);
        $ret = strlen($e->getContent());
        // test uncompression
        $roundTrip = @call_user_func($test['inv'], $e->getContent());
        $desc = "HTTP_Encoder : {$test['method']} : uncompress possible";
        $passed = assertTrue($variedContent == $roundTrip, $desc);
        // test expected compressed size
        $desc = "HTTP_Encoder : {$test['method']} : compressed to " . sprintf('%4.2f%% of original', $ret / $variedLength * 100);
        $passed = assertTrue(abs($ret - $test['exp']) < 100, $desc);
        if (__FILE__ === realpath($_SERVER['SCRIPT_FILENAME'])) {
            echo "\n--- {$test['method']}: expected bytes: ", "{$test['exp']}. Returned: {$ret} ", "(off by " . abs($ret - $test['exp']) . " bytes)\n\n";
        }
    }
}