phpZoteroWebDAV/inc/PEAR/Common.php

<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available through the world-wide-web at the following url:           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [email protected] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Stig Bakken <[email protected]>                                   |
// |          Tomas V.V.Cox <[email protected]>                             |
// +----------------------------------------------------------------------+
//
// $Id: Common.php,v 1.126.2.2 2004/12/27 07:04:19 cellog Exp $

require_once 'PEAR.php';
require_once 'Archive/Tar.php';
require_once 'System.php';
require_once 'PEAR/Config.php';

// {{{ constants and globals

/**
 * PEAR_Common error when an invalid PHP file is passed to PEAR_Common::analyzeSourceCode()
 */
define('PEAR_COMMON_ERROR_INVALIDPHP', 1);
define('_PEAR_COMMON_PACKAGE_NAME_PREG', '[A-Za-z][a-zA-Z0-9_]+');
define('PEAR_COMMON_PACKAGE_NAME_PREG', '/^' . _PEAR_COMMON_PACKAGE_NAME_PREG . '$/');

// this should allow: 1, 1.0, 1.0RC1, 1.0dev, 1.0dev123234234234, 1.0a1, 1.0b1, 1.0pl1
define('_PEAR_COMMON_PACKAGE_VERSION_PREG', '\d+(?:\.\d+)*(?:[a-zA-Z]+\d*)?');
define('PEAR_COMMON_PACKAGE_VERSION_PREG', '/^' . _PEAR_COMMON_PACKAGE_VERSION_PREG . '$/i');

// XXX far from perfect :-)
define('PEAR_COMMON_PACKAGE_DOWNLOAD_PREG', '/^(' . _PEAR_COMMON_PACKAGE_NAME_PREG . ')(-([.0-9a-zA-Z]+))?$/');

/**
 * List of temporary files and directories registered by
 * PEAR_Common::addTempFile().
 * @var array
 */
$GLOBALS['_PEAR_Common_tempfiles'] = array();

/**
 * Valid maintainer roles
 * @var array
 */
$GLOBALS['_PEAR_Common_maintainer_roles'] = array('lead','developer','contributor','helper');

/**
 * Valid release states
 * @var array
 */
$GLOBALS['_PEAR_Common_release_states'] = array('alpha','beta','stable','snapshot','devel');

/**
 * Valid dependency types
 * @var array
 */
$GLOBALS['_PEAR_Common_dependency_types'] = array('pkg','ext','php','prog','ldlib','rtlib','os','websrv','sapi');

/**
 * Valid dependency relations
 * @var array
 */
$GLOBALS['_PEAR_Common_dependency_relations'] = array('has','eq','lt','le','gt','ge','not', 'ne');

/**
 * Valid file roles
 * @var array
 */
$GLOBALS['_PEAR_Common_file_roles'] = array('php','ext','test','doc','data','src','script');

/**
 * Valid replacement types
 * @var array
 */
$GLOBALS['_PEAR_Common_replacement_types'] = array('php-const', 'pear-config', 'package-info');

/**
 * Valid "provide" types
 * @var array
 */
$GLOBALS['_PEAR_Common_provide_types'] = array('ext', 'prog', 'class', 'function', 'feature', 'api');

/**
 * Valid "provide" types
 * @var array
 */
$GLOBALS['_PEAR_Common_script_phases'] = array('pre-install', 'post-install', 'pre-uninstall', 'post-uninstall', 'pre-build', 'post-build', 'pre-configure', 'post-configure', 'pre-setup', 'post-setup');

// }}}

/**
 * Class providing common functionality for PEAR administration classes.
 * @deprecated This class will disappear, and its components will be spread
 *             into smaller classes, like the AT&T breakup
 */
class PEAR_Common extends PEAR
{
    // {{{ properties

    /** stack of elements, gives some sort of XML context */
    var $element_stack = array();

    /** name of currently parsed XML element */
    var $current_element;

    /** array of attributes of the currently parsed XML element */
    var $current_attributes = array();

    /** assoc with information about a package */
    var $pkginfo = array();

    /**
     * User Interface object (PEAR_Frontend_* class).  If null,
     * the log() method uses print.
     * @var object
     */
    var $ui = null;

    /**
     * Configuration object (PEAR_Config).
     * @var object
     */
    var $config = null;

    var $current_path = null;

    /**
     * PEAR_SourceAnalyzer instance
     * @var object
     */
    var $source_analyzer = null;
    /**
     * Flag variable used to mark a valid package file
     * @var boolean
     * @access private
     */
    var $_validPackageFile;

    // }}}

    // {{{ constructor

    /**
     * PEAR_Common constructor
     *
     * @access public
     */
    function PEAR_Common()
    {
        parent::PEAR();
        $this->config = &PEAR_Config::singleton();
        $this->debug = $this->config->get('verbose');
    }

    // }}}
    // {{{ destructor

    /**
     * PEAR_Common destructor
     *
     * @access private
     */
    function _PEAR_Common()
    {
        // doesn't work due to bug #14744
        //$tempfiles = $this->_tempfiles;
        $tempfiles =& $GLOBALS['_PEAR_Common_tempfiles'];
        while ($file = array_shift($tempfiles)) {
            if (@is_dir($file)) {
                System::rm(array('-rf', $file));
            } elseif (file_exists($file)) {
                unlink($file);
            }
        }
    }

    // }}}
    // {{{ addTempFile()

    /**
     * Register a temporary file or directory.  When the destructor is
     * executed, all registered temporary files and directories are
     * removed.
     *
     * @param string  $file  name of file or directory
     *
     * @return void
     *
     * @access public
     */
    function addTempFile($file)
    {
        $GLOBALS['_PEAR_Common_tempfiles'][] = $file;
    }

    // }}}
    // {{{ mkDirHier()

    /**
     * Wrapper to System::mkDir(), creates a directory as well as
     * any necessary parent directories.
     *
     * @param string  $dir  directory name
     *
     * @return bool TRUE on success, or a PEAR error
     *
     * @access public
     */
    function mkDirHier($dir)
    {
        $this->log(2, "+ create dir $dir");
        return System::mkDir(array('-p', $dir));
    }

    // }}}
    // {{{ log()

    /**
     * Logging method.
     *
     * @param int    $level  log level (0 is quiet, higher is noisier)
     * @param string $msg    message to write to the log
     *
     * @return void
     *
     * @access public
     */
    function log($level, $msg, $append_crlf = true)
    {
        if ($this->debug >= $level) {
            if (is_object($this->ui)) {
                $this->ui->log($msg, $append_crlf);
            } else {
                print "$msg\n";
            }
        }
    }

    // }}}
    // {{{ mkTempDir()

    /**
     * Create and register a temporary directory.
     *
     * @param string $tmpdir (optional) Directory to use as tmpdir.
     *                       Will use system defaults (for example
     *                       /tmp or c:\windows\temp) if not specified
     *
     * @return string name of created directory
     *
     * @access public
     */
    function mkTempDir($tmpdir = '')
    {
        if ($tmpdir) {
            $topt = array('-t', $tmpdir);
        } else {
            $topt = array();
        }
        $topt = array_merge($topt, array('-d', 'pear'));
        if (!$tmpdir = System::mktemp($topt)) {
            return false;
        }
        $this->addTempFile($tmpdir);
        return $tmpdir;
    }

    // }}}
    // {{{ setFrontendObject()

    /**
     * Set object that represents the frontend to be used.
     *
     * @param  object Reference of the frontend object
     * @return void
     * @access public
     */
    function setFrontendObject(&$ui)
    {
        $this->ui = &$ui;
    }

    // }}}

    // {{{ _unIndent()

    /**
     * Unindent given string (?)
     *
     * @param string $str The string that has to be unindented.
     * @return string
     * @access private
     */
    function _unIndent($str)
    {
        // remove leading newlines
        $str = preg_replace('/^[\r\n]+/', '', $str);
        // find whitespace at the beginning of the first line
        $indent_len = strspn($str, " \t");
        $indent = substr($str, 0, $indent_len);
        $data = '';
        // remove the same amount of whitespace from following lines
        foreach (explode("\n", $str) as $line) {
            if (substr($line, 0, $indent_len) == $indent) {
                $data .= substr($line, $indent_len) . "\n";
            }
        }
        return $data;
    }

    // }}}
    // {{{ _element_start()

    /**
     * XML parser callback for starting elements.  Used while package
     * format version is not yet known.
     *
     * @param resource  $xp       XML parser resource
     * @param string    $name     name of starting element
     * @param array     $attribs  element attributes, name => value
     *
     * @return void
     *
     * @access private
     */
    function _element_start($xp, $name, $attribs)
    {
        array_push($this->element_stack, $name);
        $this->current_element = $name;
        $spos = sizeof($this->element_stack) - 2;
        $this->prev_element = ($spos >= 0) ? $this->element_stack[$spos] : '';
        $this->current_attributes = $attribs;
        switch ($name) {
            case 'package': {
                $this->_validPackageFile = true;
                if (isset($attribs['version'])) {
                    $vs = preg_replace('/[^0-9a-z]/', '_', $attribs['version']);
                } else {
                    $vs = '1_0';
                }
                $elem_start = '_element_start_'. $vs;
                $elem_end = '_element_end_'. $vs;
                $cdata = '_pkginfo_cdata_'. $vs;
                if (!method_exists($this, $elem_start) ||
                      !method_exists($this, $elem_end) ||
                      !method_exists($this, $cdata)) {
                    $this->raiseError("No handlers for package.xml version $attribs[version]");
                    return;
                }
                xml_set_element_handler($xp, $elem_start, $elem_end);
                xml_set_character_data_handler($xp, $cdata);
                break;
            }
        }
    }

    // }}}
    // {{{ _element_end()

    /**
     * XML parser callback for ending elements.  Used while package
     * format version is not yet known.
     *
     * @param resource  $xp    XML parser resource
     * @param string    $name  name of ending element
     *
     * @return void
     *
     * @access private
     */
    function _element_end($xp, $name)
    {
    }

    // }}}

    // Support for package DTD v1.0:
    // {{{ _element_start_1_0()

    /**
     * XML parser callback for ending elements.  Used for version 1.0
     * packages.
     *
     * @param resource  $xp    XML parser resource
     * @param string    $name  name of ending element
     *
     * @return void
     *
     * @access private
     */
    function _element_start_1_0($xp, $name, $attribs)
    {
        array_push($this->element_stack, $name);
        $this->current_element = $name;
        $spos = sizeof($this->element_stack) - 2;
        $this->prev_element = ($spos >= 0) ? $this->element_stack[$spos] : '';
        $this->current_attributes = $attribs;
        $this->cdata = '';
        switch ($name) {
            case 'dir':
                if ($this->in_changelog) {
                    break;
                }
                if ($attribs['name'] != '/') {
                    $this->dir_names[] = $attribs['name'];
                }
                if (isset($attribs['baseinstalldir'])) {
                    $this->dir_install = $attribs['baseinstalldir'];
                }
                if (isset($attribs['role'])) {
                    $this->dir_role = $attribs['role'];
                }
                break;
            case 'file':
                if ($this->in_changelog) {
                    break;
                }
                if (isset($attribs['name'])) {
                    $path = '';
                    if (count($this->dir_names)) {
                        foreach ($this->dir_names as $dir) {
                            $path .= $dir . DIRECTORY_SEPARATOR;
                        }
                    }
                    $path .= $attribs['name'];
                    unset($attribs['name']);
                    $this->current_path = $path;
                    $this->filelist[$path] = $attribs;
                    // Set the baseinstalldir only if the file don't have this attrib
                    if (!isset($this->filelist[$path]['baseinstalldir']) &&
                        isset($this->dir_install))
                    {
                        $this->filelist[$path]['baseinstalldir'] = $this->dir_install;
                    }
                    // Set the Role
                    if (!isset($this->filelist[$path]['role']) && isset($this->dir_role)) {
                        $this->filelist[$path]['role'] = $this->dir_role;
                    }
                }
                break;
            case 'replace':
                if (!$this->in_changelog) {
                    $this->filelist[$this->current_path]['replacements'][] = $attribs;
                }
                break;
            case 'maintainers':
                $this->pkginfo['maintainers'] = array();
                $this->m_i = 0; // maintainers array index
                break;
            case 'maintainer':
                // compatibility check
                if (!isset($this->pkginfo['maintainers'])) {
                    $this->pkginfo['maintainers'] = array();
                    $this->m_i = 0;
                }
                $this->pkginfo['maintainers'][$this->m_i] = array();
                $this->current_maintainer =& $this->pkginfo['maintainers'][$this->m_i];
                break;
            case 'changelog':
                $this->pkginfo['changelog'] = array();
                $this->c_i = 0; // changelog array index
                $this->in_changelog = true;
                break;
            case 'release':
                if ($this->in_changelog) {
                    $this->pkginfo['changelog'][$this->c_i] = array();
                    $this->current_release = &$this->pkginfo['changelog'][$this->c_i];
                } else {
                    $this->current_release = &$this->pkginfo;
                }
                break;
            case 'deps':
                if (!$this->in_changelog) {
                    $this->pkginfo['release_deps'] = array();
                }
                break;
            case 'dep':
                // dependencies array index
                if (!$this->in_changelog) {
                    $this->d_i++;
                    $this->pkginfo['release_deps'][$this->d_i] = $attribs;
                }
                break;
            case 'configureoptions':
                if (!$this->in_changelog) {
                    $this->pkginfo['configure_options'] = array();
                }
                break;
            case 'configureoption':
                if (!$this->in_changelog) {
                    $this->pkginfo['configure_options'][] = $attribs;
                }
                break;
            case 'provides':
                if (empty($attribs['type']) || empty($attribs['name'])) {
                    break;
                }
                $attribs['explicit'] = true;
                $this->pkginfo['provides']["$attribs[type];$attribs[name]"] = $attribs;
                break;
        }
    }

    // }}}
    // {{{ _element_end_1_0()

    /**
     * XML parser callback for ending elements.  Used for version 1.0
     * packages.
     *
     * @param resource  $xp    XML parser resource
     * @param string    $name  name of ending element
     *
     * @return void
     *
     * @access private
     */
    function _element_end_1_0($xp, $name)
    {
        $data = trim($this->cdata);
        switch ($name) {
            case 'name':
                switch ($this->prev_element) {
                    case 'package':
                        // XXX should we check the package name here?
                        $this->pkginfo['package'] = ereg_replace('[^a-zA-Z0-9._]', '_', $data);
                        break;
                    case 'maintainer':
                        $this->current_maintainer['name'] = $data;
                        break;
                }
                break;
            case 'summary':
                $this->pkginfo['summary'] = $data;
                break;
            case 'description':
                $data = $this->_unIndent($this->cdata);
                $this->pkginfo['description'] = $data;
                break;
            case 'user':
                $this->current_maintainer['handle'] = $data;
                break;
            case 'email':
                $this->current_maintainer['email'] = $data;
                break;
            case 'role':
                $this->current_maintainer['role'] = $data;
                break;
            case 'version':
                $data = ereg_replace ('[^a-zA-Z0-9._\-]', '_', $data);
                if ($this->in_changelog) {
                    $this->current_release['version'] = $data;
                } else {
                    $this->pkginfo['version'] = $data;
                }
                break;
            case 'date':
                if ($this->in_changelog) {
                    $this->current_release['release_date'] = $data;
                } else {
                    $this->pkginfo['release_date'] = $data;
                }
                break;
            case 'notes':
                // try to "de-indent" release notes in case someone
                // has been over-indenting their xml ;-)
                $data = $this->_unIndent($this->cdata);
                if ($this->in_changelog) {
                    $this->current_release['release_notes'] = $data;
                } else {
                    $this->pkginfo['release_notes'] = $data;
                }
                break;
            case 'warnings':
                if ($this->in_changelog) {
                    $this->current_release['release_warnings'] = $data;
                } else {
                    $this->pkginfo['release_warnings'] = $data;
                }
                break;
            case 'state':
                if ($this->in_changelog) {
                    $this->current_release['release_state'] = $data;
                } else {
                    $this->pkginfo['release_state'] = $data;
                }
                break;
            case 'license':
                if ($this->in_changelog) {
                    $this->current_release['release_license'] = $data;
                } else {
                    $this->pkginfo['release_license'] = $data;
                }
                break;
            case 'dep':
                if ($data && !$this->in_changelog) {
                    $this->pkginfo['release_deps'][$this->d_i]['name'] = $data;
                }
                break;
            case 'dir':
                if ($this->in_changelog) {
                    break;
                }
                array_pop($this->dir_names);
                break;
            case 'file':
                if ($this->in_changelog) {
                    break;
                }
                if ($data) {
                    $path = '';
                    if (count($this->dir_names)) {
                        foreach ($this->dir_names as $dir) {
                            $path .= $dir . DIRECTORY_SEPARATOR;
                        }
                    }
                    $path .= $data;
                    $this->filelist[$path] = $this->current_attributes;
                    // Set the baseinstalldir only if the file don't have this attrib
                    if (!isset($this->filelist[$path]['baseinstalldir']) &&
                        isset($this->dir_install))
                    {
                        $this->filelist[$path]['baseinstalldir'] = $this->dir_install;
                    }
                    // Set the Role
                    if (!isset($this->filelist[$path]['role']) && isset($this->dir_role)) {
                        $this->filelist[$path]['role'] = $this->dir_role;
                    }
                }
                break;
            case 'maintainer':
                if (empty($this->pkginfo['maintainers'][$this->m_i]['role'])) {
                    $this->pkginfo['maintainers'][$this->m_i]['role'] = 'lead';
                }
                $this->m_i++;
                break;
            case 'release':
                if ($this->in_changelog) {
                    $this->c_i++;
                }
                break;
            case 'changelog':
                $this->in_changelog = false;
                break;
        }
        array_pop($this->element_stack);
        $spos = sizeof($this->element_stack) - 1;
        $this->current_element = ($spos > 0) ? $this->element_stack[$spos] : '';
        $this->cdata = '';
    }

    // }}}
    // {{{ _pkginfo_cdata_1_0()

    /**
     * XML parser callback for character data.  Used for version 1.0
     * packages.
     *
     * @param resource  $xp    XML parser resource
     * @param string    $name  character data
     *
     * @return void
     *
     * @access private
     */
    function _pkginfo_cdata_1_0($xp, $data)
    {
        if (isset($this->cdata)) {
            $this->cdata .= $data;
        }
    }

    // }}}

    // {{{ infoFromTgzFile()

    /**
     * Returns information about a package file.  Expects the name of
     * a gzipped tar file as input.
     *
     * @param string  $file  name of .tgz file
     *
     * @return array  array with package information
     *
     * @access public
     *
     */
    function infoFromTgzFile($file)
    {
        if (!@is_file($file)) {
            return $this->raiseError("could not open file \"$file\"");
        }
        $tar = new Archive_Tar($file);
        if ($this->debug <= 1) {
            $tar->pushErrorHandling(PEAR_ERROR_RETURN);
        }
        $content = $tar->listContent();
        if ($this->debug <= 1) {
            $tar->popErrorHandling();
        }
        if (!is_array($content)) {
            $file = realpath($file);
            return $this->raiseError("Could not get contents of package \"$file\"".
                                     '. Invalid tgz file.');
        }
        $xml = null;
        foreach ($content as $file) {
            $name = $file['filename'];
            if ($name == 'package.xml') {
                $xml = $name;
                break;
            } elseif (ereg('package.xml$', $name, $match)) {
                $xml = $match[0];
                break;
            }
        }
        $tmpdir = System::mkTemp(array('-d', 'pear'));
        $this->addTempFile($tmpdir);
        if (!$xml || !$tar->extractList(array($xml), $tmpdir)) {
            return $this->raiseError('could not extract the package.xml file');
        }
        return $this->infoFromDescriptionFile("$tmpdir/$xml");
    }

    // }}}
    // {{{ infoFromDescriptionFile()

    /**
     * Returns information about a package file.  Expects the name of
     * a package xml file as input.
     *
     * @param string  $descfile  name of package xml file
     *
     * @return array  array with package information
     *
     * @access public
     *
     */
    function infoFromDescriptionFile($descfile)
    {
        if (!@is_file($descfile) || !is_readable($descfile) ||
             (!$fp = @fopen($descfile, 'r'))) {
            return $this->raiseError("Unable to open $descfile");
        }

        // read the whole thing so we only get one cdata callback
        // for each block of cdata
        $data = fread($fp, filesize($descfile));
        return $this->infoFromString($data);
    }

    // }}}
    // {{{ infoFromString()

    /**
     * Returns information about a package file.  Expects the contents
     * of a package xml file as input.
     *
     * @param string  $data  name of package xml file
     *
     * @return array   array with package information
     *
     * @access public
     *
     */
    function infoFromString($data)
    {
        require_once('PEAR/Dependency.php');
        if (PEAR_Dependency::checkExtension($error, 'xml')) {
            return $this->raiseError($error);
        }
        $xp = @xml_parser_create();
        if (!$xp) {
            return $this->raiseError('Unable to create XML parser');
        }
        xml_set_object($xp, $this);
        xml_set_element_handler($xp, '_element_start', '_element_end');
        xml_set_character_data_handler($xp, '_pkginfo_cdata');
        xml_parser_set_option($xp, XML_OPTION_CASE_FOLDING, false);

        $this->element_stack = array();
        $this->pkginfo = array('provides' => array());
        $this->current_element = false;
        unset($this->dir_install);
        $this->pkginfo['filelist'] = array();
        $this->filelist =& $this->pkginfo['filelist'];
        $this->dir_names = array();
        $this->in_changelog = false;
        $this->d_i = 0;
        $this->cdata = '';
        $this->_validPackageFile = false;

        if (!xml_parse($xp, $data, 1)) {
            $code = xml_get_error_code($xp);
            $msg = sprintf("XML error: %s at line %d",
                           xml_error_string($code),
                           xml_get_current_line_number($xp));
            xml_parser_free($xp);
            return $this->raiseError($msg, $code);
        }

        xml_parser_free($xp);

        if (!$this->_validPackageFile) {
            return $this->raiseError('Invalid Package File, no <package> tag');
        }
        foreach ($this->pkginfo as $k => $v) {
            if (!is_array($v)) {
                $this->pkginfo[$k] = trim($v);
            }
        }
        return $this->pkginfo;
    }
    // }}}
    // {{{ infoFromAny()

    /**
     * Returns package information from different sources
     *
     * This method is able to extract information about a package
     * from a .tgz archive or from a XML package definition file.
     *
     * @access public
     * @param  string Filename of the source ('package.xml', '<package>.tgz')
     * @return string
     */
    function infoFromAny($info)
    {
        if (is_string($info) && file_exists($info)) {
            $tmp = substr($info, -4);
            if ($tmp == '.xml') {
                $info = $this->infoFromDescriptionFile($info);
            } elseif ($tmp == '.tar' || $tmp == '.tgz') {
                $info = $this->infoFromTgzFile($info);
            } else {
                $fp = fopen($info, "r");
                $test = fread($fp, 5);
                fclose($fp);
                if ($test == "<?xml") {
                    $info = $this->infoFromDescriptionFile($info);
                } else {
                    $info = $this->infoFromTgzFile($info);
                }
            }
            if (PEAR::isError($info)) {
                return $this->raiseError($info);
            }
        }
        return $info;
    }

    // }}}
    // {{{ xmlFromInfo()

    /**
     * Return an XML document based on the package info (as returned
     * by the PEAR_Common::infoFrom* methods).
     *
     * @param array  $pkginfo  package info
     *
     * @return string XML data
     *
     * @access public
     */
    function xmlFromInfo($pkginfo)
    {
        static $maint_map = array(
            "handle" => "user",
            "name" => "name",
            "email" => "email",
            "role" => "role",
            );
        $ret = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\" ?>\n";
        $ret .= "<!DOCTYPE package SYSTEM \"http://pear.php.net/dtd/package-1.0\">\n";
        $ret .= "<package version=\"1.0\">
  <name>$pkginfo[package]</name>
  <summary>".htmlspecialchars($pkginfo['summary'])."</summary>
  <description>".htmlspecialchars($pkginfo['description'])."</description>
  <maintainers>
";
        foreach ($pkginfo['maintainers'] as $maint) {
            $ret .= "    <maintainer>\n";
            foreach ($maint_map as $idx => $elm) {
                $ret .= "      <$elm>";
                $ret .= htmlspecialchars($maint[$idx]);
                $ret .= "</$elm>\n";
            }
            $ret .= "    </maintainer>\n";
        }
        $ret .= "  </maintainers>\n";
        $ret .= $this->_makeReleaseXml($pkginfo);
        if (@sizeof($pkginfo['changelog']) > 0) {
            $ret .= "  <changelog>\n";
            foreach ($pkginfo['changelog'] as $oldrelease) {
                $ret .= $this->_makeReleaseXml($oldrelease, true);
            }
            $ret .= "  </changelog>\n";
        }
        $ret .= "</package>\n";
        return $ret;
    }

    // }}}
    // {{{ _makeReleaseXml()

    /**
     * Generate part of an XML description with release information.
     *
     * @param array  $pkginfo    array with release information
     * @param bool   $changelog  whether the result will be in a changelog element
     *
     * @return string XML data
     *
     * @access private
     */
    function _makeReleaseXml($pkginfo, $changelog = false)
    {
        // XXX QUOTE ENTITIES IN PCDATA, OR EMBED IN CDATA BLOCKS!!
        $indent = $changelog ? "  " : "";
        $ret = "$indent  <release>\n";
        if (!empty($pkginfo['version'])) {
            $ret .= "$indent    <version>$pkginfo[version]</version>\n";
        }
        if (!empty($pkginfo['release_date'])) {
            $ret .= "$indent    <date>$pkginfo[release_date]</date>\n";
        }
        if (!empty($pkginfo['release_license'])) {
            $ret .= "$indent    <license>$pkginfo[release_license]</license>\n";
        }
        if (!empty($pkginfo['release_state'])) {
            $ret .= "$indent    <state>$pkginfo[release_state]</state>\n";
        }
        if (!empty($pkginfo['release_notes'])) {
            $ret .= "$indent    <notes>".htmlspecialchars($pkginfo['release_notes'])."</notes>\n";
        }
        if (!empty($pkginfo['release_warnings'])) {
            $ret .= "$indent    <warnings>".htmlspecialchars($pkginfo['release_warnings'])."</warnings>\n";
        }
        if (isset($pkginfo['release_deps']) && sizeof($pkginfo['release_deps']) > 0) {
            $ret .= "$indent    <deps>\n";
            foreach ($pkginfo['release_deps'] as $dep) {
                $ret .= "$indent      <dep type=\"$dep[type]\" rel=\"$dep[rel]\"";
                if (isset($dep['version'])) {
                    $ret .= " version=\"$dep[version]\"";
                }
                if (isset($dep['optional'])) {
                    $ret .= " optional=\"$dep[optional]\"";
                }
                if (isset($dep['name'])) {
                    $ret .= ">$dep[name]</dep>\n";
                } else {
                    $ret .= "/>\n";
                }
            }
            $ret .= "$indent    </deps>\n";
        }
        if (isset($pkginfo['configure_options'])) {
            $ret .= "$indent    <configureoptions>\n";
            foreach ($pkginfo['configure_options'] as $c) {
                $ret .= "$indent      <configureoption name=\"".
                    htmlspecialchars($c['name']) . "\"";
                if (isset($c['default'])) {
                    $ret .= " default=\"" . htmlspecialchars($c['default']) . "\"";
                }
                $ret .= " prompt=\"" . htmlspecialchars($c['prompt']) . "\"";
                $ret .= "/>\n";
            }
            $ret .= "$indent    </configureoptions>\n";
        }
        if (isset($pkginfo['provides'])) {
            foreach ($pkginfo['provides'] as $key => $what) {
                $ret .= "$indent    <provides type=\"$what[type]\" ";
                $ret .= "name=\"$what[name]\" ";
                if (isset($what['extends'])) {
                    $ret .= "extends=\"$what[extends]\" ";
                }
                $ret .= "/>\n";
            }
        }
        if (isset($pkginfo['filelist'])) {
            $ret .= "$indent    <filelist>\n";
            foreach ($pkginfo['filelist'] as $file => $fa) {
                @$ret .= "$indent      <file role=\"$fa[role]\"";
                if (isset($fa['baseinstalldir'])) {
                    $ret .= ' baseinstalldir="' .
                        htmlspecialchars($fa['baseinstalldir']) . '"';
                }
                if (isset($fa['md5sum'])) {
                    $ret .= " md5sum=\"$fa[md5sum]\"";
                }
                if (isset($fa['platform'])) {
                    $ret .= " platform=\"$fa[platform]\"";
                }
                if (!empty($fa['install-as'])) {
                    $ret .= ' install-as="' .
                        htmlspecialchars($fa['install-as']) . '"';
                }
                $ret .= ' name="' . htmlspecialchars($file) . '"';
                if (empty($fa['replacements'])) {
                    $ret .= "/>\n";
                } else {
                    $ret .= ">\n";
                    foreach ($fa['replacements'] as $r) {
                        $ret .= "$indent        <replace";
                        foreach ($r as $k => $v) {
                            $ret .= " $k=\"" . htmlspecialchars($v) .'"';
                        }
                        $ret .= "/>\n";
                    }
                    @$ret .= "$indent      </file>\n";
                }
            }
            $ret .= "$indent    </filelist>\n";
        }
        $ret .= "$indent  </release>\n";
        return $ret;
    }

    // }}}
    // {{{ validatePackageInfo()

    /**
     * Validate XML package definition file.
     *
     * @param  string $info Filename of the package archive or of the
     *                package definition file
     * @param  array $errors Array that will contain the errors
     * @param  array $warnings Array that will contain the warnings
     * @param  string $dir_prefix (optional) directory where source files
     *                may be found, or empty if they are not available
     * @access public
     * @return boolean
     */
    function validatePackageInfo($info, &$errors, &$warnings, $dir_prefix = '')
    {
        if (PEAR::isError($info = $this->infoFromAny($info))) {
            return $this->raiseError($info);
        }
        if (!is_array($info)) {
            return false;
        }

        $errors = array();
        $warnings = array();
        if (!isset($info['package'])) {
            $errors[] = 'missing package name';
        } elseif (!$this->validPackageName($info['package'])) {
            $errors[] = 'invalid package name';
        }
        $this->_packageName = $pn = $info['package'];

        if (empty($info['summary'])) {
            $errors[] = 'missing summary';
        } elseif (strpos(trim($info['summary']), "\n") !== false) {
            $warnings[] = 'summary should be on a single line';
        }
        if (empty($info['description'])) {
            $errors[] = 'missing description';
        }
        if (empty($info['release_license'])) {
            $errors[] = 'missing license';
        }
        if (!isset($info['version'])) {
            $errors[] = 'missing version';
        } elseif (!$this->validPackageVersion($info['version'])) {
            $errors[] = 'invalid package release version';
        }
        if (empty($info['release_state'])) {
            $errors[] = 'missing release state';
        } elseif (!in_array($info['release_state'], PEAR_Common::getReleaseStates())) {
            $errors[] = "invalid release state `$info[release_state]', should be one of: "
                . implode(' ', PEAR_Common::getReleaseStates());
        }
        if (empty($info['release_date'])) {
            $errors[] = 'missing release date';
        } elseif (!preg_match('/^\d{4}-\d\d-\d\d$/', $info['release_date'])) {
            $errors[] = "invalid release date `$info[release_date]', format is YYYY-MM-DD";
        }
        if (empty($info['release_notes'])) {
            $errors[] = "missing release notes";
        }
        if (empty($info['maintainers'])) {
            $errors[] = 'no maintainer(s)';
        } else {
            $i = 1;
            foreach ($info['maintainers'] as $m) {
                if (empty($m['handle'])) {
                    $errors[] = "maintainer $i: missing handle";
                }
                if (empty($m['role'])) {
                    $errors[] = "maintainer $i: missing role";
                } elseif (!in_array($m['role'], PEAR_Common::getUserRoles())) {
                    $errors[] = "maintainer $i: invalid role `$m[role]', should be one of: "
                        . implode(' ', PEAR_Common::getUserRoles());
                }
                if (empty($m['name'])) {
                    $errors[] = "maintainer $i: missing name";
                }
                if (empty($m['email'])) {
                    $errors[] = "maintainer $i: missing email";
                }
                $i++;
            }
        }
        if (!empty($info['release_deps'])) {
            $i = 1;
            foreach ($info['release_deps'] as $d) {
                if (empty($d['type'])) {
                    $errors[] = "dependency $i: missing type";
                } elseif (!in_array($d['type'], PEAR_Common::getDependencyTypes())) {
                    $errors[] = "dependency $i: invalid type '$d[type]', should be one of: " .
                        implode(' ', PEAR_Common::getDependencyTypes());
                }
                if (empty($d['rel'])) {
                    $errors[] = "dependency $i: missing relation";
                } elseif (!in_array($d['rel'], PEAR_Common::getDependencyRelations())) {
                    $errors[] = "dependency $i: invalid relation '$d[rel]', should be one of: "
                        . implode(' ', PEAR_Common::getDependencyRelations());
                }
                if (!empty($d['optional'])) {
                    if (!in_array($d['optional'], array('yes', 'no'))) {
                        $errors[] = "dependency $i: invalid relation optional attribute '$d[optional]', should be one of: yes no";
                    } else {
                        if (($d['rel'] == 'not' || $d['rel'] == 'ne') && $d['optional'] == 'yes') {
                            $errors[] = "dependency $i: 'not' and 'ne' dependencies cannot be " .
                                "optional";
                        }
                    }
                }
                if ($d['rel'] != 'not' && $d['rel'] != 'has' && empty($d['version'])) {
                    $warnings[] = "dependency $i: missing version";
                } elseif (($d['rel'] == 'not' || $d['rel'] == 'has') && !empty($d['version'])) {
                    $warnings[] = "dependency $i: version ignored for `$d[rel]' dependencies";
                }
                if ($d['rel'] == 'not' && !empty($d['version'])) {
                    $warnings[] = "dependency $i: 'not' defines a total conflict, to exclude " .
                        "specific versions, use 'ne'";
                }
                if ($d['type'] == 'php' && !empty($d['name'])) {
                    $warnings[] = "dependency $i: name ignored for php type dependencies";
                } elseif ($d['type'] != 'php' && empty($d['name'])) {
                    $errors[] = "dependency $i: missing name";
                }
                if ($d['type'] == 'php' && $d['rel'] == 'not') {
                    $errors[] = "dependency $i: PHP dependencies cannot use 'not' " .
                        "rel, use 'ne' to exclude versions";
                }
                $i++;
            }
        }
        if (!empty($info['configure_options'])) {
            $i = 1;
            foreach ($info['configure_options'] as $c) {
                if (empty($c['name'])) {
                    $errors[] = "configure option $i: missing name";
                }
                if (empty($c['prompt'])) {
                    $errors[] = "configure option $i: missing prompt";
                }
                $i++;
            }
        }
        if (empty($info['filelist'])) {
            $errors[] = 'no files';
        } else {
            foreach ($info['filelist'] as $file => $fa) {
                if (empty($fa['role'])) {
                    $errors[] = "file $file: missing role";
                    continue;
                } elseif (!in_array($fa['role'], PEAR_Common::getFileRoles())) {
                    $errors[] = "file $file: invalid role, should be one of: "
                        . implode(' ', PEAR_Common::getFileRoles());
                }
                if ($fa['role'] == 'php' && $dir_prefix) {
                    $this->log(1, "Analyzing $file");
                    $srcinfo = $this->analyzeSourceCode($dir_prefix . DIRECTORY_SEPARATOR . $file);
                    if ($srcinfo) {
                        $this->buildProvidesArray($srcinfo);
                    }
                }

                // (ssb) Any checks we can do for baseinstalldir?
                // (cox) Perhaps checks that either the target dir and
                //       baseInstall doesn't cointain "../../"
            }
        }
        $this->_packageName = $pn = $info['package'];
        $pnl = strlen($pn);
        foreach ((array)$this->pkginfo['provides'] as $key => $what) {
            if (isset($what['explicit'])) {
                // skip conformance checks if the provides entry is
                // specified in the package.xml file
                continue;
            }
            extract($what);
            if ($type == 'class') {
                if (!strncasecmp($name, $pn, $pnl)) {
                    continue;
                }
                $warnings[] = "in $file: class \"$name\" not prefixed with package name \"$pn\"";
            } elseif ($type == 'function') {
                if (strstr($name, '::') || !strncasecmp($name, $pn, $pnl)) {
                    continue;
                }
                $warnings[] = "in $file: function \"$name\" not prefixed with package name \"$pn\"";
            }
        }


        return true;
    }

    // }}}
    // {{{ buildProvidesArray()

    /**
     * Build a "provides" array from data returned by
     * analyzeSourceCode().  The format of the built array is like
     * this:
     *
     *  array(
     *    'class;MyClass' => 'array('type' => 'class', 'name' => 'MyClass'),
     *    ...
     *  )
     *
     *
     * @param array $srcinfo array with information about a source file
     * as returned by the analyzeSourceCode() method.
     *
     * @return void
     *
     * @access public
     *
     */
    function buildProvidesArray($srcinfo)
    {
        $file = basename($srcinfo['source_file']);
        $pn = '';
        if (isset($this->_packageName)) {
            $pn = $this->_packageName;
        }
        $pnl = strlen($pn);
        foreach ($srcinfo['declared_classes'] as $class) {
            $key = "class;$class";
            if (isset($this->pkginfo['provides'][$key])) {
                continue;
            }
            $this->pkginfo['provides'][$key] =
                array('file'=> $file, 'type' => 'class', 'name' => $class);
            if (isset($srcinfo['inheritance'][$class])) {
                $this->pkginfo['provides'][$key]['extends'] =
                    $srcinfo['inheritance'][$class];
            }
        }
        foreach ($srcinfo['declared_methods'] as $class => $methods) {
            foreach ($methods as $method) {
                $function = "$class::$method";
                $key = "function;$function";
                if ($method{0} == '_' || !strcasecmp($method, $class) ||
                    isset($this->pkginfo['provides'][$key])) {
                    continue;
                }
                $this->pkginfo['provides'][$key] =
                    array('file'=> $file, 'type' => 'function', 'name' => $function);
            }
        }

        foreach ($srcinfo['declared_functions'] as $function) {
            $key = "function;$function";
            if ($function{0} == '_' || isset($this->pkginfo['provides'][$key])) {
                continue;
            }
            if (!strstr($function, '::') && strncasecmp($function, $pn, $pnl)) {
                $warnings[] = "in1 " . $file . ": function \"$function\" not prefixed with package name \"$pn\"";
            }
            $this->pkginfo['provides'][$key] =
                array('file'=> $file, 'type' => 'function', 'name' => $function);
        }
    }

    // }}}
    // {{{ analyzeSourceCode()

    /**
     * Analyze the source code of the given PHP file
     *
     * @param  string Filename of the PHP file
     * @return mixed
     * @access public
     */
    function analyzeSourceCode($file)
    {
        if (!function_exists("token_get_all")) {
            return false;
        }
        if (!defined('T_DOC_COMMENT')) {
            define('T_DOC_COMMENT', T_COMMENT);
        }
        if (!defined('T_INTERFACE')) {
            define('T_INTERFACE', -1);
        }
        if (!defined('T_IMPLEMENTS')) {
            define('T_IMPLEMENTS', -1);
        }
        if (!$fp = @fopen($file, "r")) {
            return false;
        }
        $contents = fread($fp, filesize($file));
        $tokens = token_get_all($contents);
/*
        for ($i = 0; $i < sizeof($tokens); $i++) {
            @list($token, $data) = $tokens[$i];
            if (is_string($token)) {
                var_dump($token);
            } else {
                print token_name($token) . ' ';
                var_dump(rtrim($data));
            }
        }
*/
        $look_for = 0;
        $paren_level = 0;
        $bracket_level = 0;
        $brace_level = 0;
        $lastphpdoc = '';
        $current_class = '';
        $current_interface = '';
        $current_class_level = -1;
        $current_function = '';
        $current_function_level = -1;
        $declared_classes = array();
        $declared_interfaces = array();
        $declared_functions = array();
        $declared_methods = array();
        $used_classes = array();
        $used_functions = array();
        $extends = array();
        $implements = array();
        $nodeps = array();
        $inquote = false;
        $interface = false;
        for ($i = 0; $i < sizeof($tokens); $i++) {
            if (is_array($tokens[$i])) {
                list($token, $data) = $tokens[$i];
            } else {
                $token = $tokens[$i];
                $data = '';
            }
            if ($inquote) {
                if ($token != '"') {
                    continue;
                } else {
                    $inquote = false;
                }
            }
            switch ($token) {
                case T_WHITESPACE:
                    continue;
                case ';':
                    if ($interface) {
                        $current_function = '';
                        $current_function_level = -1;
                    }
                    break;
                case '"':
                    $inquote = true;
                    break;
                case T_CURLY_OPEN:
                case T_DOLLAR_OPEN_CURLY_BRACES:
                case '{': $brace_level++; continue 2;
                case '}':
                    $brace_level--;
                    if ($current_class_level == $brace_level) {
                        $current_class = '';
                        $current_class_level = -1;
                    }
                    if ($current_function_level == $brace_level) {
                        $current_function = '';
                        $current_function_level = -1;
                    }
                    continue 2;
                case '[': $bracket_level++; continue 2;
                case ']': $bracket_level--; continue 2;
                case '(': $paren_level++;   continue 2;
                case ')': $paren_level--;   continue 2;
                case T_INTERFACE:
                    $interface = true;
                case T_CLASS:
                    if (($current_class_level != -1) || ($current_function_level != -1)) {
                        PEAR::raiseError("Parser error: Invalid PHP file $file",
                            PEAR_COMMON_ERROR_INVALIDPHP);
                        return false;
                    }
                case T_FUNCTION:
                case T_NEW:
                case T_EXTENDS:
                case T_IMPLEMENTS:
                    $look_for = $token;
                    continue 2;
                case T_STRING:
                    if (version_compare(zend_version(), '2.0', '<')) {
                        if (in_array(strtolower($data),
                            array('public', 'private', 'protected', 'abstract',
                                  'interface', 'implements', 'clone', 'throw') 
                                 )) {
                            PEAR::raiseError('Error: PHP5 packages must be packaged by php 5 PEAR');
                            return false;
                        }
                    }
                    if ($look_for == T_CLASS) {
                        $current_class = $data;
                        $current_class_level = $brace_level;
                        $declared_classes[] = $current_class;
                    } elseif ($look_for == T_INTERFACE) {
                        $current_interface = $data;
                        $current_class_level = $brace_level;
                        $declared_interfaces[] = $current_interface;
                    } elseif ($look_for == T_IMPLEMENTS) {
                        $implements[$current_class] = $data;
                    } elseif ($look_for == T_EXTENDS) {
                        $extends[$current_class] = $data;
                    } elseif ($look_for == T_FUNCTION) {
                        if ($current_class) {
                            $current_function = "$current_class::$data";
                            $declared_methods[$current_class][] = $data;
                        } elseif ($current_interface) {
                            $current_function = "$current_interface::$data";
                            $declared_methods[$current_interface][] = $data;
                        } else {
                            $current_function = $data;
                            $declared_functions[] = $current_function;
                        }
                        $current_function_level = $brace_level;
                        $m = array();
                    } elseif ($look_for == T_NEW) {
                        $used_classes[$data] = true;
                    }
                    $look_for = 0;
                    continue 2;
                case T_VARIABLE:
                    $look_for = 0;
                    continue 2;
                case T_DOC_COMMENT:
                case T_COMMENT:
                    if (preg_match('!^/\*\*\s!', $data)) {
                        $lastphpdoc = $data;
                        if (preg_match_all('/@nodep\s+(\S+)/', $lastphpdoc, $m)) {
                            $nodeps = array_merge($nodeps, $m[1]);
                        }
                    }
                    continue 2;
                case T_DOUBLE_COLON:
                    if (!($tokens[$i - 1][0] == T_WHITESPACE || $tokens[$i - 1][0] == T_STRING)) {
                        PEAR::raiseError("Parser error: Invalid PHP file $file",
                            PEAR_COMMON_ERROR_INVALIDPHP);
                        return false;
                    }
                    $class = $tokens[$i - 1][1];
                    if (strtolower($class) != 'parent') {
                        $used_classes[$class] = true;
                    }
                    continue 2;
            }
        }
        return array(
            "source_file" => $file,
            "declared_classes" => $declared_classes,
            "declared_interfaces" => $declared_interfaces,
            "declared_methods" => $declared_methods,
            "declared_functions" => $declared_functions,
            "used_classes" => array_diff(array_keys($used_classes), $nodeps),
            "inheritance" => $extends,
            "implements" => $implements,
            );
    }

    // }}}
    // {{{  betterStates()

    /**
     * Return an array containing all of the states that are more stable than
     * or equal to the passed in state
     *
     * @param string Release state
     * @param boolean Determines whether to include $state in the list
     * @return false|array False if $state is not a valid release state
     */
    function betterStates($state, $include = false)
    {
        static $states = array('snapshot', 'devel', 'alpha', 'beta', 'stable');
        $i = array_search($state, $states);
        if ($i === false) {
            return false;
        }
        if ($include) {
            $i--;
        }
        return array_slice($states, $i + 1);
    }

    // }}}
    // {{{ detectDependencies()

    function detectDependencies($any, $status_callback = null)
    {
        if (!function_exists("token_get_all")) {
            return false;
        }
        if (PEAR::isError($info = $this->infoFromAny($any))) {
            return $this->raiseError($info);
        }
        if (!is_array($info)) {
            return false;
        }
        $deps = array();
        $used_c = $decl_c = $decl_f = $decl_m = array();
        foreach ($info['filelist'] as $file => $fa) {
            $tmp = $this->analyzeSourceCode($file);
            $used_c = @array_merge($used_c, $tmp['used_classes']);
            $decl_c = @array_merge($decl_c, $tmp['declared_classes']);
            $decl_f = @array_merge($decl_f, $tmp['declared_functions']);
            $decl_m = @array_merge($decl_m, $tmp['declared_methods']);
            $inheri = @array_merge($inheri, $tmp['inheritance']);
        }
        $used_c = array_unique($used_c);
        $decl_c = array_unique($decl_c);
        $undecl_c = array_diff($used_c, $decl_c);
        return array('used_classes' => $used_c,
                     'declared_classes' => $decl_c,
                     'declared_methods' => $decl_m,
                     'declared_functions' => $decl_f,
                     'undeclared_classes' => $undecl_c,
                     'inheritance' => $inheri,
                     );
    }

    // }}}
    // {{{ getUserRoles()

    /**
     * Get the valid roles for a PEAR package maintainer
     *
     * @return array
     * @static
     */
    function getUserRoles()
    {
        return $GLOBALS['_PEAR_Common_maintainer_roles'];
    }

    // }}}
    // {{{ getReleaseStates()

    /**
     * Get the valid package release states of packages
     *
     * @return array
     * @static
     */
    function getReleaseStates()
    {
        return $GLOBALS['_PEAR_Common_release_states'];
    }

    // }}}
    // {{{ getDependencyTypes()

    /**
     * Get the implemented dependency types (php, ext, pkg etc.)
     *
     * @return array
     * @static
     */
    function getDependencyTypes()
    {
        return $GLOBALS['_PEAR_Common_dependency_types'];
    }

    // }}}
    // {{{ getDependencyRelations()

    /**
     * Get the implemented dependency relations (has, lt, ge etc.)
     *
     * @return array
     * @static
     */
    function getDependencyRelations()
    {
        return $GLOBALS['_PEAR_Common_dependency_relations'];
    }

    // }}}
    // {{{ getFileRoles()

    /**
     * Get the implemented file roles
     *
     * @return array
     * @static
     */
    function getFileRoles()
    {
        return $GLOBALS['_PEAR_Common_file_roles'];
    }

    // }}}
    // {{{ getReplacementTypes()

    /**
     * Get the implemented file replacement types in
     *
     * @return array
     * @static
     */
    function getReplacementTypes()
    {
        return $GLOBALS['_PEAR_Common_replacement_types'];
    }

    // }}}
    // {{{ getProvideTypes()

    /**
     * Get the implemented file replacement types in
     *
     * @return array
     * @static
     */
    function getProvideTypes()
    {
        return $GLOBALS['_PEAR_Common_provide_types'];
    }

    // }}}
    // {{{ getScriptPhases()

    /**
     * Get the implemented file replacement types in
     *
     * @return array
     * @static
     */
    function getScriptPhases()
    {
        return $GLOBALS['_PEAR_Common_script_phases'];
    }

    // }}}
    // {{{ validPackageName()

    /**
     * Test whether a string contains a valid package name.
     *
     * @param string $name the package name to test
     *
     * @return bool
     *
     * @access public
     */
    function validPackageName($name)
    {
        return (bool)preg_match(PEAR_COMMON_PACKAGE_NAME_PREG, $name);
    }


    // }}}
    // {{{ validPackageVersion()

    /**
     * Test whether a string contains a valid package version.
     *
     * @param string $ver the package version to test
     *
     * @return bool
     *
     * @access public
     */
    function validPackageVersion($ver)
    {
        return (bool)preg_match(PEAR_COMMON_PACKAGE_VERSION_PREG, $ver);
    }


    // }}}

    // {{{ downloadHttp()

    /**
     * Download a file through HTTP.  Considers suggested file name in
     * Content-disposition: header and can run a callback function for
     * different events.  The callback will be called with two
     * parameters: the callback type, and parameters.  The implemented
     * callback types are:
     *
     *  'setup'       called at the very beginning, parameter is a UI object
     *                that should be used for all output
     *  'message'     the parameter is a string with an informational message
     *  'saveas'      may be used to save with a different file name, the
     *                parameter is the filename that is about to be used.
     *                If a 'saveas' callback returns a non-empty string,
     *                that file name will be used as the filename instead.
     *                Note that $save_dir will not be affected by this, only
     *                the basename of the file.
     *  'start'       download is starting, parameter is number of bytes
     *                that are expected, or -1 if unknown
     *  'bytesread'   parameter is the number of bytes read so far
     *  'done'        download is complete, parameter is the total number
     *                of bytes read
     *  'connfailed'  if the TCP connection fails, this callback is called
     *                with array(host,port,errno,errmsg)
     *  'writefailed' if writing to disk fails, this callback is called
     *                with array(destfile,errmsg)
     *
     * If an HTTP proxy has been configured (http_proxy PEAR_Config
     * setting), the proxy will be used.
     *
     * @param string  $url       the URL to download
     * @param object  $ui        PEAR_Frontend_* instance
     * @param object  $config    PEAR_Config instance
     * @param string  $save_dir  (optional) directory to save file in
     * @param mixed   $callback  (optional) function/method to call for status
     *                           updates
     *
     * @return string  Returns the full path of the downloaded file or a PEAR
     *                 error on failure.  If the error is caused by
     *                 socket-related errors, the error object will
     *                 have the fsockopen error code available through
     *                 getCode().
     *
     * @access public
     */
    function downloadHttp($url, &$ui, $save_dir = '.', $callback = null)
    {
        if ($callback) {
            call_user_func($callback, 'setup', array(&$ui));
        }
        if (preg_match('!^http://([^/:?#]*)(:(\d+))?(/.*)!', $url, $matches)) {
            list(,$host,,$port,$path) = $matches;
        }
        if (isset($this)) {
            $config = &$this->config;
        } else {
            $config = &PEAR_Config::singleton();
        }
        $proxy_host = $proxy_port = $proxy_user = $proxy_pass = '';
        if ($proxy = parse_url($config->get('http_proxy'))) {
            $proxy_host = @$proxy['host'];
            $proxy_port = @$proxy['port'];
            $proxy_user = @$proxy['user'];
            $proxy_pass = @$proxy['pass'];

            if ($proxy_port == '') {
                $proxy_port = 8080;
            }
            if ($callback) {
                call_user_func($callback, 'message', "Using HTTP proxy $host:$port");
            }
        }
        if (empty($port)) {
            $port = 80;
        }
        if ($proxy_host != '') {
            $fp = @fsockopen($proxy_host, $proxy_port, $errno, $errstr);
            if (!$fp) {
                if ($callback) {
                    call_user_func($callback, 'connfailed', array($proxy_host, $proxy_port,
                                                                  $errno, $errstr));
                }
                return PEAR::raiseError("Connection to `$proxy_host:$proxy_port' failed: $errstr", $errno);
            }
            $request = "GET $url HTTP/1.0\r\n";
        } else {
            $fp = @fsockopen($host, $port, $errno, $errstr);
            if (!$fp) {
                if ($callback) {
                    call_user_func($callback, 'connfailed', array($host, $port,
                                                                  $errno, $errstr));
                }
                return PEAR::raiseError("Connection to `$host:$port' failed: $errstr", $errno);
            }
            $request = "GET $path HTTP/1.0\r\n";
        }
        $request .= "Host: $host:$port\r\n".
            "User-Agent: PHP/".PHP_VERSION."\r\n";
        if ($proxy_host != '' && $proxy_user != '') {
            $request .= 'Proxy-Authorization: Basic ' .
                base64_encode($proxy_user . ':' . $proxy_pass) . "\r\n";
        }
        $request .= "\r\n";
        fwrite($fp, $request);
        $headers = array();
        while (trim($line = fgets($fp, 1024))) {
            if (preg_match('/^([^:]+):\s+(.*)\s*$/', $line, $matches)) {
                $headers[strtolower($matches[1])] = trim($matches[2]);
            } elseif (preg_match('|^HTTP/1.[01] ([0-9]{3}) |', $line, $matches)) {
                if ($matches[1] != 200) {
                    return PEAR::raiseError("File http://$host:$port$path not valid (received: $line)");
                }
            }
        }
        if (isset($headers['content-disposition']) &&
            preg_match('/\sfilename=\"([^;]*\S)\"\s*(;|$)/', $headers['content-disposition'], $matches)) {
            $save_as = basename($matches[1]);
        } else {
            $save_as = basename($url);
        }
        if ($callback) {
            $tmp = call_user_func($callback, 'saveas', $save_as);
            if ($tmp) {
                $save_as = $tmp;
            }
        }
        $dest_file = $save_dir . DIRECTORY_SEPARATOR . $save_as;
        if (!$wp = @fopen($dest_file, 'wb')) {
            fclose($fp);
            if ($callback) {
                call_user_func($callback, 'writefailed', array($dest_file, $php_errormsg));
            }
            return PEAR::raiseError("could not open $dest_file for writing");
        }
        if (isset($headers['content-length'])) {
            $length = $headers['content-length'];
        } else {
            $length = -1;
        }
        $bytes = 0;
        if ($callback) {
            call_user_func($callback, 'start', array(basename($dest_file), $length));
        }
        while ($data = @fread($fp, 1024)) {
            $bytes += strlen($data);
            if ($callback) {
                call_user_func($callback, 'bytesread', $bytes);
            }
            if (!@fwrite($wp, $data)) {
                fclose($fp);
                if ($callback) {
                    call_user_func($callback, 'writefailed', array($dest_file, $php_errormsg));
                }
                return PEAR::raiseError("$dest_file: write failed ($php_errormsg)");
            }
        }
        fclose($fp);
        fclose($wp);
        if ($callback) {
            call_user_func($callback, 'done', $bytes);
        }
        return $dest_file;
    }

    // }}}
    // {{{ sortPkgDeps()

    /**
     * Sort a list of arrays of array(downloaded packagefilename) by dependency.
     *
     * It also removes duplicate dependencies
     * @param array
     * @param boolean Sort packages in reverse order if true
     * @return array array of array(packagefilename, package.xml contents)
     */
    function sortPkgDeps(&$packages, $uninstall = false)
    {
        $ret = array();
        if ($uninstall) {
            foreach($packages as $packageinfo) {
                $ret[] = array('info' => $packageinfo);
            }
        } else {
            foreach($packages as $packagefile) {
                if (!is_array($packagefile)) {
                    $ret[] = array('file' => $packagefile,
                                   'info' => $a = $this->infoFromAny($packagefile),
                                   'pkg' => $a['package']);
                } else {
                    $ret[] = $packagefile;
                }
            }
        }
        $checkdupes = array();
        $newret = array();
        foreach($ret as $i => $p) {
            if (!isset($checkdupes[$p['info']['package']])) {
                $checkdupes[$p['info']['package']][] = $i;
                $newret[] = $p;
            }
        }
        $this->_packageSortTree = $this->_getPkgDepTree($newret);

        $func = $uninstall ? '_sortPkgDepsRev' : '_sortPkgDeps';
        usort($newret, array(&$this, $func));
        $this->_packageSortTree = null;
        $packages = $newret;
    }

    // }}}
    // {{{ _sortPkgDeps()

    /**
     * Compare two package's package.xml, and sort
     * so that dependencies are installed first
     *
     * This is a crude compare, real dependency checking is done on install.
     * The only purpose this serves is to make the command-line
     * order-independent (you can list a dependent package first, and
     * installation occurs in the order required)
     * @access private
     */
    function _sortPkgDeps($p1, $p2)
    {
        $p1name = $p1['info']['package'];
        $p2name = $p2['info']['package'];
        $p1deps = $this->_getPkgDeps($p1);
        $p2deps = $this->_getPkgDeps($p2);
        if (!count($p1deps) && !count($p2deps)) {
            return 0; // order makes no difference
        }
        if (!count($p1deps)) {
            return -1; // package 2 has dependencies, package 1 doesn't
        }
        if (!count($p2deps)) {
            return 1; // package 1 has dependencies, package 2 doesn't
        }
        // both have dependencies
        if (in_array($p1name, $p2deps)) {
            return -1; // put package 1 first: package 2 depends on package 1
        }
        if (in_array($p2name, $p1deps)) {
            return 1; // put package 2 first: package 1 depends on package 2
        }
        if ($this->_removedDependency($p1name, $p2name)) {
            return -1; // put package 1 first: package 2 depends on packages that depend on package 1
        }
        if ($this->_removedDependency($p2name, $p1name)) {
            return 1; // put package 2 first: package 1 depends on packages that depend on package 2
        }
        // doesn't really matter if neither depends on the other
        return 0;
    }

    // }}}
    // {{{ _sortPkgDepsRev()

    /**
     * Compare two package's package.xml, and sort
     * so that dependencies are uninstalled last
     *
     * This is a crude compare, real dependency checking is done on uninstall.
     * The only purpose this serves is to make the command-line
     * order-independent (you can list a dependency first, and
     * uninstallation occurs in the order required)
     * @access private
     */
    function _sortPkgDepsRev($p1, $p2)
    {
        $p1name = $p1['info']['package'];
        $p2name = $p2['info']['package'];
        $p1deps = $this->_getRevPkgDeps($p1);
        $p2deps = $this->_getRevPkgDeps($p2);
        if (!count($p1deps) && !count($p2deps)) {
            return 0; // order makes no difference
        }
        if (!count($p1deps)) {
            return 1; // package 2 has dependencies, package 1 doesn't
        }
        if (!count($p2deps)) {
            return -1; // package 2 has dependencies, package 1 doesn't
        }
        // both have dependencies
        if (in_array($p1name, $p2deps)) {
            return 1; // put package 1 last
        }
        if (in_array($p2name, $p1deps)) {
            return -1; // put package 2 last
        }
        if ($this->_removedDependency($p1name, $p2name)) {
            return 1; // put package 1 last: package 2 depends on packages that depend on package 1
        }
        if ($this->_removedDependency($p2name, $p1name)) {
            return -1; // put package 2 last: package 1 depends on packages that depend on package 2
        }
        // doesn't really matter if neither depends on the other
        return 0;
    }

    // }}}
    // {{{ _getPkgDeps()

    /**
     * get an array of package dependency names
     * @param array
     * @return array
     * @access private
     */
    function _getPkgDeps($p)
    {
        if (!isset($p['info']['releases'])) {
            return $this->_getRevPkgDeps($p);
        }
        $rel = array_shift($p['info']['releases']);
        if (!isset($rel['deps'])) {
            return array();
        }
        $ret = array();
        foreach($rel['deps'] as $dep) {
            if ($dep['type'] == 'pkg') {
                $ret[] = $dep['name'];
            }
        }
        return $ret;
    }

    // }}}
    // {{{ _getPkgDeps()

    /**
     * get an array representation of the package dependency tree
     * @return array
     * @access private
     */
    function _getPkgDepTree($packages)
    {
        $tree = array();
        foreach ($packages as $p) {
            $package = $p['info']['package'];
            $deps = $this->_getPkgDeps($p);
            $tree[$package] = $deps;
        }
        return $tree;
    }

    // }}}
    // {{{ _removedDependency($p1, $p2)

    /**
     * get an array of package dependency names for uninstall
     * @param string package 1 name
     * @param string package 2 name
     * @return bool
     * @access private
     */
    function _removedDependency($p1, $p2)
    {
        if (empty($this->_packageSortTree[$p2])) {
            return false;
        }
        if (!in_array($p1, $this->_packageSortTree[$p2])) {
            foreach ($this->_packageSortTree[$p2] as $potential) {
                if ($this->_removedDependency($p1, $potential)) {
                    return true;
                }
            }
            return false;
        }
        return true;
    }

    // }}}
    // {{{ _getRevPkgDeps()

    /**
     * get an array of package dependency names for uninstall
     * @param array
     * @return array
     * @access private
     */
    function _getRevPkgDeps($p)
    {
        if (!isset($p['info']['release_deps'])) {
            return array();
        }
        $ret = array();
        foreach($p['info']['release_deps'] as $dep) {
            if ($dep['type'] == 'pkg') {
                $ret[] = $dep['name'];
            }
        }
        return $ret;
    }

    // }}}
}

?>