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class.upload.php

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<?php
// +------------------------------------------------------------------------+
// | class.upload.php                                                       |
// +------------------------------------------------------------------------+
// | Copyright (c) Colin Verot 2003-2007. All rights reserved.              |
// | Version       0.25                                                     |
// | Last modified 17/11/2007                                               |
// | Email         [email protected]                                          |
// | Web           http://www.verot.net                                     |
// +------------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify   |
// | it under the terms of the GNU General Public License version 2 as      |
// | published by the Free Software Foundation.                             |
// |                                                                        |
// | This program is distributed in the hope that it will be useful,        |
// | but WITHOUT ANY WARRANTY; without even the implied warranty of         |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          |
// | GNU General Public License for more details.                           |
// |                                                                        |
// | You should have received a copy of the GNU General Public License      |
// | along with this program; if not, write to the                          |
// |   Free Software Foundation, Inc., 59 Temple Place, Suite 330,          |
// |   Boston, MA 02111-1307 USA                                            |
// |                                                                        |
// | Please give credit on sites that use class.upload and submit changes   |
// | of the script so other people can use them as well.                    |
// | This script is free to use, don't abuse.                               |
// +------------------------------------------------------------------------+
//

/**
 * Class upload
 *
 * @version   0.25
 * @author    Colin Verot <[email protected]>
 * @license   http://opensource.org/licenses/gpl-license.php GNU Public License
 * @copyright Colin Verot
 * @package   cmf
 * @subpackage external
 */

/**
 * Class upload
 *
 * <b>What does it do?</b>
 *
 * It manages file uploads for you. In short, it manages the uploaded file, 
 * and allows you to do whatever you want with the file, especially if it 
 * is an image, and as many times as you want.
 *
 * It is the ideal class to quickly integrate file upload in your site.
 * If the file is an image, you can convert, resize, crop it in many ways.
 * You can also apply filters, add borders, text, watermarks, etc...
 * That's all you need for a gallery script for instance. Supported formats
 * are PNG, JPG, GIF and BMP.
 *
 * You can also use the class to work on local files, which is especially
 * useful to use the image manipulation features.
 *
 * The class works with PHP 4 and 5, and its error messages can
 * be localized at will.
 *
 * <b>How does it work?</b>
 *
 * You instanciate the class with the $_FILES['my_field'] array
 * where my_field is the field name from your upload form.
 * The class will check if the original file has been uploaded
 * to its temporary location (alternatively, you can instanciate
 * the class with a local filename).
 *
 * You can then set a number of processing variables to act on the file.
 * For instance, you can rename the file, and if it is an image,
 * convert and resize it in many ways.
 * You can also set what will the class do if the file already exists.
 *
 * Then you call the function {@link process} to actually perform the actions
 * according to the processing parameters you set above.
 * It will create new instances of the original file,
 * so the original file remains the same between each process.
 * The file will be manipulated, and copied to the given location.
 * The processing variables will be reseted once it is done.
 *
 * You can repeat setting up a new set of processing variables,
 * and calling {@link process} again as many times as you want.
 * When you have finished, you can call {@link clean} to delete
 * the original uploaded file.
 *
 * If you don't set any processing parameters and call {@link process}
 * just after instanciating the class. The uploaded file will be simply
 * copied to the given location without any alteration or checks.
 *
 * Don't forget to add <i>enctype="multipart/form-data"</i> in your form
 * tag <form> if you want your form to upload the file.
 *
 * <b>How to use it?</b><br>
 * Create a simple HTML file, with a form such as:
 * <pre>
 * <form enctype="multipart/form-data" method="post" action="upload.php">
 *   <input type="file" size="32" name="image_field" value="">
 *   <input type="submit" name="Submit" value="upload">
 * </form>
 * </pre>
 * Create a file called upload.php:
 * <pre>
 *  $handle = new upload($_FILES['image_field']);
 *  if ($handle->uploaded) {
 *      $handle->file_new_name_body   = 'image_resized';
 *      $handle->image_resize         = true;
 *      $handle->image_x              = 100;
 *      $handle->image_ratio_y        = true;
 *      $handle->process('/home/user/files/');
 *      if ($handle->processed) {
 *          echo 'image resized';
 *          $handle->clean();
 *      } else {
 *          echo 'error : ' . $handle->error;
 *      }
 *  }
 * </pre>
 *
 * <b>How to process local files?</b><br>
 * Use the class as following, the rest being the same as above:
 * <pre>
 *  $handle = new upload('/home/user/myfile.jpg');
 * </pre>
 * 
 * <b>How to set the language?</b><br>
 * Instantiate the class with a second argument being the language code:
 * <pre>
 *  $handle = new upload($_FILES['image_field'], 'fr_FR');
 *  $handle = new upload('/home/user/myfile.jpg', 'fr_FR');
 * </pre>
 * 
 * <b>How to output the resulting file or picture directly to the browser?</b><br>
 * Simply call {@link process}() without an argument (or with null as first argument):
 * <pre>
 *  $handle = new upload($_FILES['image_field']);
 *  header('Content-type: ' . $handle->file_src_mime);
 *  echo $handle->Process();
 *  die();
 * </pre>
 * Or if you want to force the download of the file:
 * <pre>
 *  $handle = new upload($_FILES['image_field']);
 *  header('Content-type: ' . $handle->file_src_mime);
 *  header("Content-Disposition: attachment; filename=".rawurlencode($handle->file_src_name).";");
 *  echo $handle->Process();
 *  die();
 * </pre>
 *
 * <b>Processing parameters</b> (reseted after each process)
 * <ul>
 *  <li><b>file_new_name_body</b> replaces the name body (default: '')<br>
 *  <pre>$handle->file_new_name_body = 'new name';</pre></li>
 *  <li><b>file_name_body_add</b> appends to the name body (default: '')<br>
 *  <pre>$handle->file_name_body_add = '_uploaded';</pre></li>
 *  <li><b>file_new_name_ext</b> replaces the file extension (default: '')<br>
 *  <pre>$handle->file_new_name_ext = 'txt';</pre></li>
 *  <li><b>file_safe_name</b> formats the filename (spaces changed to _) (default: true)<br>
 *  <pre>$handle->file_safe_name = true;</pre></li>
 *  <li><b>file_overwrite</b> sets behaviour if file already exists (default: false)<br>
 *  <pre>$handle->file_overwrite = true;</pre></li>
 *  <li><b>file_auto_rename</b> automatically renames file if it already exists (default: true)<br>
 *  <pre>$handle->file_auto_rename = true;</pre></li>
 *  <li><b>auto_create_dir</b> automatically creates destination directory if missing (default: true)<br>