src/PEAR/Installer/Role/Common.php
function processInstallation($pkg, $atts, $file, $tmp_path, $layer = null)
    {
        $roleInfo = PEAR_Installer_Role_Common::getInfo('PEAR_Installer_Role_' . 
            ucfirst(str_replace('pear_installer_role_', '', strtolower(get_class($this)))));
        if (PEAR::isError($roleInfo)) {
            return $roleInfo;
        }
        if (!$roleInfo['locationconfig']) {
            return false;
        }
        if ($roleInfo['honorsbaseinstall']) {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'], $layer,
                $pkg->getChannel());
            if (!empty($atts['baseinstalldir'])) {
                $dest_dir .= DIRECTORY_SEPARATOR . $atts['baseinstalldir'];
            }
        } elseif ($roleInfo['unusualbaseinstall']) {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'],
                    $layer, $pkg->getChannel()) . DIRECTORY_SEPARATOR . $pkg->getPackage();
            if (!empty($atts['baseinstalldir'])) {
                $dest_dir .= DIRECTORY_SEPARATOR . $atts['baseinstalldir'];
            }
        } else {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'],
                    $layer, $pkg->getChannel()) . DIRECTORY_SEPARATOR . $pkg->getPackage();
        }
        if (dirname($file) != '.' && empty($atts['install-as'])) {
            $dest_dir .= DIRECTORY_SEPARATOR . dirname($file);
        }
        if (empty($atts['install-as'])) {
            $dest_file = $dest_dir . DIRECTORY_SEPARATOR . basename($file);
        } else {
            $dest_file = $dest_dir . DIRECTORY_SEPARATOR . $atts['install-as'];
        }
        $orig_file = $tmp_path . DIRECTORY_SEPARATOR . $file;

        // Clean up the DIRECTORY_SEPARATOR mess
        $ds2 = DIRECTORY_SEPARATOR . DIRECTORY_SEPARATOR;
        
        list($dest_dir, $dest_file, $orig_file) = preg_replace(array('!\\\\+!', '!/!', "!$ds2+!"),
                                                    array(DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR,
                                                          DIRECTORY_SEPARATOR),
                                                    array($dest_dir, $dest_file, $orig_file));
        return array($save_destdir, $dest_dir, $dest_file, $orig_file);
    }
function processInstallation($pkg, $atts, $file, $tmp_path, $layer = null)
    {
        $roleInfo = PEAR_Installer_Role_Common::getInfo('PEAR_Installer_Role_' . 
            ucfirst(str_replace('pear_installer_role_', '', strtolower(get_class($this)))));
        if (PEAR::isError($roleInfo)) {
            return $roleInfo;
        }
        if (!$roleInfo['locationconfig']) {
            return false;
        }
        if ($roleInfo['honorsbaseinstall']) {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'], $layer,
                $pkg->getChannel());
            if (!empty($atts['baseinstalldir'])) {
                $dest_dir .= DIRECTORY_SEPARATOR . $atts['baseinstalldir'];
            }
        } elseif ($roleInfo['unusualbaseinstall']) {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'],
                    $layer, $pkg->getChannel()) . DIRECTORY_SEPARATOR . $pkg->getPackage();
            if (!empty($atts['baseinstalldir'])) {
                $dest_dir .= DIRECTORY_SEPARATOR . $atts['baseinstalldir'];
            }
        } else {
            $dest_dir = $save_destdir = $this->config->get($roleInfo['locationconfig'],
                    $layer, $pkg->getChannel()) . DIRECTORY_SEPARATOR . $pkg->getPackage();
        }
        if (dirname($file) != '.' && empty($atts['install-as'])) {
            $dest_dir .= DIRECTORY_SEPARATOR . dirname($file);
        }
        if (empty($atts['install-as'])) {
            $dest_file = $dest_dir . DIRECTORY_SEPARATOR . basename($file);
        } else {
            $dest_file = $dest_dir . DIRECTORY_SEPARATOR . $atts['install-as'];
        }
        $orig_file = $tmp_path . DIRECTORY_SEPARATOR . $file;

        // Clean up the DIRECTORY_SEPARATOR mess
        $ds2 = DIRECTORY_SEPARATOR . DIRECTORY_SEPARATOR;
        
        list($dest_dir, $dest_file, $orig_file) = preg_replace(array('!\\\\+!', '!/!', "!$ds2+!"),
                                                    array(DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR,
                                                          DIRECTORY_SEPARATOR),
                                                    array($dest_dir, $dest_file, $orig_file));
        return array($save_destdir, $dest_dir, $dest_file, $orig_file);
    }
This is called for each file to set up the directories and files
@param PEAR_PackageFile_v1|PEAR_PackageFile_v2
@param array attributes from the <file> tag
@param string file name
@return array an array consisting of:

1 the original, pre-baseinstalldir installation directory
2 the final installation directory
3 the full path to the final location of the file
4 the location of the pre-installation file