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<?php
/**
 * @version		$Id: file.php 13031 2009-10-02 21:54:22Z louis $
 * @package		Joomla.Framework
 * @subpackage	FileSystem
 * @copyright	Copyright (C) 2005 - 2009 Open Source Matters, Inc. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

// Check to ensure this file is within the rest of the framework
if( !defined( '_JEXEC' ) && !defined( '_VALID_MOS' ) ) die( 'Restricted access' );

require_once(dirname(__FILE__).'/path.php');

/**
 * A File handling class
 *
 * @static
 * @package 	Joomla.Framework
 * @subpackage	FileSystem
 * @since		1.5
 */
class extFile
{
	/**
	 * Gets the extension of a file name
	 *
	 * @param string $file The file name
	 * @return string The file extension
	 * @since 1.5
	 */
	static function getExt($file) {
		$dot = strrpos($file, '.') + 1;
		return substr($file, $dot);
	}

	/**
	 * Strips the last extension off a file name
	 *
	 * @param string $file The file name
	 * @return string The file name without the extension
	 * @since 1.5
	 */
	static function stripExt($file) {
		return preg_replace('#\.[^.]*$#', '', $file);
	}

	/**
	 * Makes file name safe to use
	 *
	 * @param string $file The name of the file [not full path]
	 * @return string The sanitised string
	 * @since 1.5
	 */
	static function makeSafe($file) {
		$regex = array('#(\.){2,}#', '#[^A-Za-z0-9\.\_\- ]#', '#^\.#');
		return preg_replace($regex, '', $file);
	}


	/**
	 * Read the contents of a file
	 *
	 * @param string $filename The full file path
	 * @param boolean $incpath Use include path
	 * @param int $amount Amount of file to read
	 * @param int $chunksize Size of chunks to read
	 * @param int $offset Offset of the file
	 * @return mixed Returns file contents or boolean False if failed
	 * @since 1.5
	 */
	static function read($filename, $incpath = false, $amount = 0, $chunksize = 8192, $offset = 0)
	{
		// Initialize variables
		$data = null;
		if($amount && $chunksize > $amount) { $chunksize = $amount; }
		if (false === $fh = fopen($filename, 'rb', $incpath)) {
			JError::raiseWarning(21, 'extFile::read: '.JText::_('Unable to open file') . ": '$filename'");
			return false;
		}
		clearstatcache();
		if($offset) fseek($fh, $offset);
		if ($fsize = @ filesize($filename)) {
			if($amount && $fsize > $amount) {
				$data = fread($fh, $amount);
			} else {
				$data = fread($fh, $fsize);
			}
		} else {
			$data = '';
			$x = 0;
			// While its:
			// 1: Not the end of the file AND
			// 2a: No Max Amount set OR
			// 2b: The length of the data is less than the max amount we want
			while (!feof($fh) && (!$amount || strlen($data) < $amount)) {
				$data .= fread($fh, $chunksize);
			}
		}
		fclose($fh);

		return $data;
	}


	/**
	 * Wrapper for the standard file_exists function
	 *
	 * @param string $file File path
	 * @return boolean True if path is a file
	 * @since 1.5
	 */
	static function exists($file)
	{
		return is_file(extPath::clean($file));
	}

	/**
	 * Returns the name, sans any path
	 *
	 * param string $file File path
	 * @return string filename
	 * @since 1.5
	 */
	static function getName($file) {
		$slash = strrpos($file, DS);
		if ($slash !== false) {
			return substr($file, $slash + 1);
		} else {
			return $file;
		}
	}
}