Subversion-Projekte lars-tiefland.php_share

<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * File

 *

 * PHP versions 4 and 5

 *

 * LICENSE: This source file is subject to version 3.0 of the PHP license

 * that is available through the world-wide-web at the following URI:

 * 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 web, please

 * send a note to license@php.net so we can mail you a copy immediately.

 *

 * @category    File

 * @package     File

 * @author      Richard Heyes <richard@php.net>

 * @author      Tal Peer <tal@php.net>

 * @author      Michael Wallner <mike@php.net>

 * @copyright   2002-2005 The Authors

 * @license     http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version     CVS: $Id: File.php,v 1.38 2007/03/24 16:38:56 dufuz Exp $

 * @link        http://pear.php.net/package/File

 */

/**

 * Requires PEAR

 */

require_once 'PEAR.php';

/**

 * The default number of bytes for reading

 */

if (!defined('FILE_DEFAULT_READSIZE')) {

    define('FILE_DEFAULT_READSIZE', 1024, true);

}

/**

 * The maximum number of bytes for reading lines

 */

if (!defined('FILE_MAX_LINE_READSIZE')) {

    define('FILE_MAX_LINE_READSIZE', 40960, true);

}

/**

 * Whether file locks should block

 */

if (!defined('FILE_LOCKS_BLOCK')) {

    define('FILE_LOCKS_BLOCK', true, true);

}

/**

 * Mode to use for reading from files

 */

define('FILE_MODE_READ', 'rb', true);

/**

 * Mode to use for truncating files, then writing

 */

define('FILE_MODE_WRITE', 'wb', true);

/**

 * Mode to use for appending to files

 */

define('FILE_MODE_APPEND', 'ab', true);

/**

 * Use this when a shared (read) lock is required

 */

define('FILE_LOCK_SHARED', LOCK_SH | (FILE_LOCKS_BLOCK ? 0 : LOCK_NB), true);

/**

 * Use this when an exclusive (write) lock is required

 */

define('FILE_LOCK_EXCLUSIVE', LOCK_EX | (FILE_LOCKS_BLOCK ? 0 : LOCK_NB), true);

/**

 * Class for handling files

 *

 * A class with common functions for writing,

 * reading and handling files and directories

 *

 * @author  Richard Heyes <richard@php.net>

 * @author  Tal Peer <tal@php.net>

 * @author  Michael Wallner <mike@php.net>

 * @access  public

 * @package File

 *

 * @static

 */

class File extends PEAR

{

    /**

     * Destructor

     *

     * Unlocks any locked file pointers and closes all filepointers

     *

     * @access private

     */

    function _File()

    {

        File::closeAll();

    }

    /**

     * Handles file pointers. If a file pointer needs to be opened,

     * it will be. If it already exists (based on filename and mode)

     * then the existing one will be returned.

     *

     * @access  private

     * @param   string  $filename Filename to be used

     * @param   string  $mode Mode to open the file in

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error on error or file pointer resource on success

     */

    function _getFilePointer($filename, $mode, $lock = false)

    {

        $filePointers = &PEAR::getStaticProperty('File', 'filePointers');

        // Win32 is case-insensitive

        if (OS_WINDOWS) {

            $filename = strtolower($filename);

        }

        // check if file pointer already exists

        if (!isset($filePointers[$filename][$mode]) ||

            !is_resource($filePointers[$filename][$mode])) {

            // check if we can open the file in the desired mode

            switch ($mode)

            {

                case FILE_MODE_READ:

                    if (!preg_match('/^.+(?<!file):\/\//i', $filename) &&

                        !file_exists($filename)) {

                        return PEAR::raiseError("File does not exist: $filename");

                    }

                break;

                case FILE_MODE_APPEND:

                case FILE_MODE_WRITE:

                    if (file_exists($filename)) {

                        if (!is_writable($filename)) {

                            return PEAR::raiseError("File is not writable: $filename");

                        }

                    } elseif (!is_writable($dir = dirname($filename))) {

                        return PEAR::raiseError("Cannot create file in directory: $dir");

                    }

                break;

                default:

                    return PEAR::raiseError("Invalid access mode: $mode");

            }

            // open file

            $filePointers[$filename][$mode] = @fopen($filename, $mode);

            if (!is_resource($filePointers[$filename][$mode])) {

                return PEAR::raiseError('Failed to open file: ' . $filename);

            }

        }

        // lock file

        if ($lock) {

            $lock = $mode == FILE_MODE_READ ? FILE_LOCK_SHARED : FILE_LOCK_EXCLUSIVE;

            $locks = &PEAR::getStaticProperty('File', 'locks');

            if (@flock($filePointers[$filename][$mode], $lock)) {

                $locks[] = &$filePointers[$filename][$mode];

            } elseif (FILE_LOCKS_BLOCK) {

                return PEAR::raiseError("File already locked: $filename");

            } else {

                return PEAR::raiseError("Could not lock file: $filename");

            }

        }

        return $filePointers[$filename][$mode];

    }

    /**

     * Reads an entire file and returns it.

     * Uses file_get_contents if available.

     *

     * @access  public

     * @param   string  $filename Name of file to read from

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error if an error has occured or a string with the contents of the the file

     */

    function readAll($filename, $lock = false)

    {

        if (false === $file = @file_get_contents($filename)) {

            return PEAR::raiseError("Cannot read file: $filename");

        }

        return $file;

    }

    /**

     * Returns a specified number of bytes of a file.

     * Defaults to FILE_DEFAULT_READSIZE.  If $size is 0, all file will be read.

     *

     * @access  public

     * @param   string  $filename Name of file to read from

     * @param   integer $size Bytes to read

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error on error or a string which contains the data read

     *                  Will also return false upon EOF

     */

    function read($filename, $size = FILE_DEFAULT_READSIZE, $lock = false)

    {

        static $filePointers;

        if ($size == 0) {

            return File::readAll($filename, $lock);

        }

        if (!isset($filePointers[$filename]) ||

            !is_resource($filePointers[$filename])) {

            $fp = File::_getFilePointer($filename, FILE_MODE_READ, $lock);

            if (PEAR::isError($fp)) {

                return $fp;

            }

            $filePointers[$filename] = $fp;

        } else {

            $fp = $filePointers[$filename];

        }

        return !feof($fp) ? fread($fp, $size) : false;

    }

    /**

     * Writes the given data to the given filename.

     * Defaults to no lock, append mode.

     *

     * @access  public

     * @param   string  $filename Name of file to write to

     * @param   string  $data Data to write to file

     * @param   string  $mode Mode to open file in

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error on error or number of bytes written to file.

     */

    function write($filename, $data, $mode = FILE_MODE_APPEND, $lock = false)

    {

        $fp = File::_getFilePointer($filename, $mode, $lock);

        if (PEAR::isError($fp)) {

            return $fp;

        }

        if (false === $bytes = @fwrite($fp, $data, strlen($data))) {

            return PEAR::raiseError("Cannot write data: '$data' to file: '$filename'");

        }

        return $bytes;

    }

    /**

     * Reads and returns a single character from given filename

     *

     * @access  public

     * @param   string  $filename Name of file to read from

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error on error or one character of the specified file

     */

    function readChar($filename, $lock = false)

    {

        return File::read($filename, 1, $lock);

    }

    /**

     * Writes a single character to a file

     *

     * @access  public

     * @param   string  $filename Name of file to write to

     * @param   string  $char Character to write

     * @param   string  $mode Mode to use when writing

     * @param   mixed   $lock Type of lock to use

     * @return  mixed   PEAR_Error on error, or 1 on success

     */

    function writeChar($filename, $char, $mode = FILE_MODE_APPEND, $lock = false)

    {

        $fp = File::_getFilePointer($filename, $mode, $lock);

        if (PEAR::isError($fp)) {

            return $fp;

        }

        if (false === @fwrite($fp, $char, 1)) {

            return PEAR::raiseError("Cannot write data: '$data' to file: '$filename'");

        }

        return 1;

    }

    /**

     * Returns a line of the file (without trailing CRLF).

     * Maximum read line length is FILE_MAX_LINE_READSIZE.

     *

     * @access  public

     * @param   string  $filename Name of file to read from

     * @param   boolean $lock Whether file should be locked

     * @return  mixed   PEAR_Error on error or a string containing the line read from file

     */

    function readLine($filename, $lock = false)

    {

        static $filePointers; // Used to prevent unnecessary calls to _getFilePointer()

        if (!isset($filePointers[$filename]) ||

            !is_resource($filePointers[$filename])) {

            $fp = File::_getFilePointer($filename, FILE_MODE_READ, $lock);

            if (PEAR::isError($fp)) {

                return $fp;

            }

            $filePointers[$filename] = $fp;

        } else {

            $fp = $filePointers[$filename];

        }

        if (feof($fp)) {

            return false;

        }

        return rtrim(fgets($fp, FILE_MAX_LINE_READSIZE), "\r\n");

    }

    /**

     * Writes a single line, appending a LF (by default)

     *

     * @access  public

     * @param   string  $filename Name of file to write to

     * @param   string  $line Line of data to be written to file

     * @param   string  $mode Write mode, can be either FILE_MODE_WRITE or FILE_MODE_APPEND

     * @param   string  $crlf The CRLF your system is using. UNIX = \n Windows = \r\n Mac = \r

     * @param   mixed   $lock Whether to lock the file

     * @return  mixed   PEAR_Error on error or number of bytes written to file (including appended crlf)

     */

    function writeLine($filename, $line, $mode = FILE_MODE_APPEND, $crlf = "\n", $lock = false)

    {

        $fp = File::_getFilePointer($filename, $mode, $lock);

        if (PEAR::isError($fp)) {

            return $fp;

        }

        if (false === $bytes = fwrite($fp, $line . $crlf)) {

            return PEAR::raiseError("Cannot write data: '$data' to file: '$file'");

        }

        return $bytes;

    }

    /**

     * This rewinds a filepointer to the start of a file

     *

     * @access  public

     * @param   string  $filename The filename

     * @param   string  $mode Mode the file was opened in

     * @return  mixed   PEAR Error on error, true on success

     */

    function rewind($filename, $mode)

    {

        $fp = File::_getFilePointer($filename, $mode);

        if (PEAR::isError($fp)) {

            return $fp;

        }

        if (!@rewind($fp)) {

            return PEAR::raiseError("Cannot rewind file: $filename");

        }

        return true;

    }

    /**

     * Closes all open file pointers

     *

     * @access  public

     * @return  void

     */

    function closeAll()

    {

        $locks = &PEAR::getStaticProperty('File', 'locks');

        $filePointers = &PEAR::getStaticProperty('File', 'filePointers');

        // unlock files

        for ($i = 0, $c = count($locks); $i < $c; $i++) {

            is_resource($locks[$i]) and @flock($locks[$i], LOCK_UN);

        }

        // close files

        if (!empty($filePointers)) {

            foreach ($filePointers as $fname => $modes) {

                foreach (array_keys($modes) as $mode) {

                    if (is_resource($filePointers[$fname][$mode])) {

                        @fclose($filePointers[$fname][$mode]);

                    }

                    unset($filePointers[$fname][$mode]);

                }

            }

        }

    }

    /**

     * This closes an open file pointer

     *

     * @access  public

     * @param   string  $filename The filename that was opened

     * @param   string  $mode Mode the file was opened in

     * @return  mixed   PEAR Error on error, true otherwise

     */

    function close($filename, $mode)

    {

        $filePointers = &PEAR::getStaticProperty('File', 'filePointers');

        if (OS_WINDOWS) {

            $filename = strToLower($filename);

        }

        if (!isset($filePointers[$filename][$mode])) {

            return true;

        }

        $fp = $filePointers[$filename][$mode];

        unset($filePointers[$filename][$mode]);

        if (is_resource($fp)) {

            // unlock file

            @flock($fp, LOCK_UN);

            // close file

            if (!@fclose($fp)) {

                return PEAR::raiseError("Cannot close file: $filename");

            }

        }

        return true;

    }

    /**

     * This unlocks a locked file pointer.

     *

     * @access  public

     * @param   string  $filename The filename that was opened

     * @param   string  $mode Mode the file was opened in

     * @return  mixed   PEAR Error on error, true otherwise

     */

    function unlock($filename, $mode)

    {

        $fp = File::_getFilePointer($filename, $mode);

        if (PEAR::isError($fp)) {

            return $fp;

        }

        if (!@flock($fp, LOCK_UN)) {

            return PEAR::raiseError("Cacnnot unlock file: $filename");

        }

        return true;

    }

    /**

     * @deprecated

     */

    function stripTrailingSeparators($path, $separator = DIRECTORY_SEPARATOR)

    {

        if ($path === $separator) {

            return $path;

        }

        return rtrim($path, $separator);

    }

    /**

     * @deprecated

     */

    function stripLeadingSeparators($path, $separator = DIRECTORY_SEPARATOR)

    {

        if ($path === $separator) {

            return $path;

        }

        return ltrim($path, $separator);

    }

    /**

     * @deprecated Use File_Util::buildPath() instead.

     */

    function buildPath($parts, $separator = DIRECTORY_SEPARATOR)

    {

        require_once 'File/Util.php';

        return File_Util::buildPath($parts, $separator);

    }

    /**

     * @deprecated Use File_Util::skipRoot() instead.

     */

    function skipRoot($path)

    {

        require_once 'File/Util.php';

        return File_Util::skipRoot($path);

    }

    /**

     * @deprecated Use File_Util::tmpDir() instead.

     */

    function getTempDir()

    {

        require_once 'File/Util.php';

        return File_Util::tmpDir();

    }

    /**

     * @deprecated Use File_Util::tmpFile() instead.

     */

    function getTempFile($dirname = null)

    {

        require_once 'File/Util.php';

        return File_Util::tmpFile($dirname);

    }

    /**

     * @deprecated Use File_Util::isAbsolute() instead.

     */

    function isAbsolute($path)

    {

        require_once 'File/Util.php';

        return File_Util::isAbsolute($path);

    }

    /**

     * @deprecated Use File_Util::relativePath() instead.

     */

    function relativePath($path, $root, $separator = DIRECTORY_SEPARATOR)

    {

        require_once 'File/Util.php';

        return File_Util::relativePath($path, $root, $separator);

    }

    /**

     * @deprecated Use File_Util::realpath() instead.

     */

    function realpath($path, $separator = DIRECTORY_SEPARATOR)

    {

        require_once 'File/Util.php';

        return File_Util::realpath($path, $separator);

    }

}

PEAR::registerShutdownFunc(array('File', '_File'));

?>