class OS_Guess

class OS_Guess {
    var $sysname;
    var $nodename;
    var $cpu;
    var $release;
    var $extra;
    function __construct($uname = null) {
        list($this->sysname, $this->release, $this->cpu, $this->extra, $this->nodename) = $this->parseSignature($uname);
    }
    function parseSignature($uname = null) {
        static $sysmap = array(
            'HP-UX' => 'hpux',
            'IRIX64' => 'irix',
        );
        static $cpumap = array(
            'i586' => 'i386',
            'i686' => 'i386',
            'ppc' => 'powerpc',
        );
        if ($uname === null) {
            $uname = php_uname();
        }
        $parts = preg_split('/\\s+/', trim($uname));
        $n = count($parts);
        $release = $machine = $cpu = '';
        $sysname = $parts[0];
        $nodename = $parts[1];
        $cpu = $parts[$n - 1];
        $extra = '';
        if ($cpu == 'unknown') {
            $cpu = $parts[$n - 2];
        }
        switch ($sysname) {
            case 'AIX':
                $release = "{$parts[3]}.{$parts[2]}";
                break;
            case 'Windows':
                $release = $parts[1];
                if ($release == '95/98') {
                    $release = '9x';
                }
                $cpu = 'i386';
                break;
            case 'Linux':
                $extra = $this->_detectGlibcVersion();
                // use only the first two digits from the kernel version
                $release = preg_replace('/^([0-9]+\\.[0-9]+).*/', '\\1', $parts[2]);
                break;
            case 'Mac':
                $sysname = 'darwin';
                $nodename = $parts[2];
                $release = $parts[3];
                $cpu = $this->_determineIfPowerpc($cpu, $parts);
                break;
            case 'Darwin':
                $cpu = $this->_determineIfPowerpc($cpu, $parts);
                $release = preg_replace('/^([0-9]+\\.[0-9]+).*/', '\\1', $parts[2]);
                break;
            default:
                $release = preg_replace('/-.*/', '', $parts[2]);
                break;
        }
        if (isset($sysmap[$sysname])) {
            $sysname = $sysmap[$sysname];
        }
        else {
            $sysname = strtolower($sysname);
        }
        if (isset($cpumap[$cpu])) {
            $cpu = $cpumap[$cpu];
        }
        return array(
            $sysname,
            $release,
            $cpu,
            $extra,
            $nodename,
        );
    }
    function _determineIfPowerpc($cpu, $parts) {
        $n = count($parts);
        if ($cpu == 'Macintosh' && $parts[$n - 2] == 'Power') {
            $cpu = 'powerpc';
        }
        return $cpu;
    }
    function _detectGlibcVersion() {
        static $glibc = false;
        if ($glibc !== false) {
            return $glibc;
            // no need to run this multiple times
        }
        $major = $minor = 0;
        include_once "System.php";
        // Let's try reading possible libc.so.6 symlinks
        $libcs = array(
            '/lib64/libc.so.6',
            '/lib/libc.so.6',
            '/lib/i386-linux-gnu/libc.so.6',
        );
        $versions = array();
        foreach ($libcs as $file) {
            $versions = $this->_readGlibCVersionFromSymlink($file);
            if ($versions != []) {
                list($major, $minor) = $versions;
                break;
            }
        }
        // Use glibc's <features.h> header file to
        // get major and minor version number:
        if (!($major && $minor)) {
            $versions = $this->_readGlibCVersionFromFeaturesHeaderFile();
        }
        if (is_array($versions) && $versions != []) {
            list($major, $minor) = $versions;
        }
        if (!($major && $minor)) {
            return $glibc = '';
        }
        return $glibc = "glibc{$major}.{$minor}";
    }
    function _readGlibCVersionFromSymlink($file) {
        $versions = array();
        if (@is_link($file) && preg_match('/^libc-(.*)\\.so$/', basename(readlink($file)), $matches)) {
            $versions = explode('.', $matches[1]);
        }
        return $versions;
    }
    function _readGlibCVersionFromFeaturesHeaderFile() {
        $features_header_file = '/usr/include/features.h';
        if (!(@file_exists($features_header_file) && @is_readable($features_header_file))) {
            return array();
        }
        if (!@file_exists('/usr/bin/cpp') || !@is_executable('/usr/bin/cpp')) {
            return $this->_parseFeaturesHeaderFile($features_header_file);
        }
        // no cpp
        return $this->_fromGlibCTest();
    }
    function _parseFeaturesHeaderFile($features_header_file) {
        $features_file = fopen($features_header_file, 'rb');
        while (!feof($features_file)) {
            $line = fgets($features_file, 8192);
            if (!$this->_IsADefinition($line)) {
                continue;
            }
            if (strpos($line, '__GLIBC__')) {
                // major version number #define __GLIBC__ version
                $line = preg_split('/\\s+/', $line);
                $glibc_major = trim($line[2]);
                if (isset($glibc_minor)) {
                    break;
                }
                continue;
            }
            if (strpos($line, '__GLIBC_MINOR__')) {
                // got the minor version number
                // #define __GLIBC_MINOR__ version
                $line = preg_split('/\\s+/', $line);
                $glibc_minor = trim($line[2]);
                if (isset($glibc_major)) {
                    break;
                }
            }
        }
        fclose($features_file);
        if (!isset($glibc_major) || !isset($glibc_minor)) {
            return array();
        }
        return array(
            trim($glibc_major),
            trim($glibc_minor),
        );
    }
    function _IsADefinition($line) {
        if ($line === false) {
            return false;
        }
        return strpos(trim($line), '#define') !== false;
    }
    function _fromGlibCTest() {
        $major = null;
        $minor = null;
        $tmpfile = System::mktemp("glibctest");
        $fp = fopen($tmpfile, "w");
        fwrite($fp, "#include <features.h>\n__GLIBC__ __GLIBC_MINOR__\n");
        fclose($fp);
        $cpp = popen("/usr/bin/cpp {$tmpfile}", "r");
        while ($line = fgets($cpp, 1024)) {
            if ($line[0] == '#' || trim($line) == '') {
                continue;
            }
            if (list($major, $minor) = explode(' ', trim($line))) {
                break;
            }
        }
        pclose($cpp);
        unlink($tmpfile);
        if ($major !== null && $minor !== null) {
            return [
                $major,
                $minor,
            ];
        }
    }
    function getSignature() {
        if (empty($this->extra)) {
            return "{$this->sysname}-{$this->release}-{$this->cpu}";
        }
        return "{$this->sysname}-{$this->release}-{$this->cpu}-{$this->extra}";
    }
    function getSysname() {
        return $this->sysname;
    }
    function getNodename() {
        return $this->nodename;
    }
    function getCpu() {
        return $this->cpu;
    }
    function getRelease() {
        return $this->release;
    }
    function getExtra() {
        return $this->extra;
    }
    function matchSignature($match) {
        $fragments = is_array($match) ? $match : explode('-', $match);
        $n = count($fragments);
        $matches = 0;
        if ($n > 0) {
            $matches += $this->_matchFragment($fragments[0], $this->sysname);
        }
        if ($n > 1) {
            $matches += $this->_matchFragment($fragments[1], $this->release);
        }
        if ($n > 2) {
            $matches += $this->_matchFragment($fragments[2], $this->cpu);
        }
        if ($n > 3) {
            $matches += $this->_matchFragment($fragments[3], $this->extra);
        }
        return $matches == $n;
    }
    function _matchFragment($fragment, $value) {
        if (strcspn($fragment, '*?') < strlen($fragment)) {
            $expression = str_replace(array(
                '*',
                '?',
                '/',
            ), array(
                '.*',
                '.',
                '\\/',
            ), $fragment);
            $reg = '/^' . $expression . '\\z/';
            return preg_match($reg, $value);
        }
        return $fragment == '*' || !strcasecmp($fragment, $value);
    }

}