drupal/modules/upload/upload.admin.inc

<?php
// $Id$

/**
 * Form API callback to validate the upload settings form.
 */
function upload_admin_settings_validate($form, &$form_state) {
  if (($form_state['values']['upload_max_resolution'] != '0')) {
    if (!preg_match('/^[0-9]+x[0-9]+$/', $form_state['values']['upload_max_resolution'])) {
      form_set_error('upload_max_resolution', t('The maximum allowed image size expressed as WIDTHxHEIGHT (e.g. 640x480). Set to 0 for no restriction.'));
    }
  }

  $default_uploadsize = $form_state['values']['upload_uploadsize_default'];
  $default_usersize = $form_state['values']['upload_usersize_default'];

  $exceed_max_msg = t('Your PHP settings limit the maximum file size per upload to %size MB.', array('%size' => file_upload_max_size())) .'<br/>';
  $more_info = t("Depending on your sever environment, these settings may be changed in the system-wide php.ini file, a php.ini file in your Drupal root directory, in your Drupal site's settings.php file, or in the .htaccess file in your Drupal root directory.");

  if (!is_numeric($default_uploadsize) || ($default_uploadsize <= 0)) {
    form_set_error('upload_uploadsize_default', t('The %role file size limit must be a number and greater than zero.', array('%role' => t('default'))));
  }
  if (!is_numeric($default_usersize) || ($default_usersize <= 0)) {
    form_set_error('upload_usersize_default', t('The %role file size limit must be a number and greater than zero.', array('%role' => t('default'))));
  }
  if ($default_uploadsize > file_upload_max_size()) {
    form_set_error('upload_uploadsize_default', $exceed_max_msg . $more_info);
    $more_info = '';
  }
  if ($default_uploadsize > $default_usersize) {
    form_set_error('upload_uploadsize_default', t('The %role maximum file size per upload is greater than the total file size allowed per user', array('%role' => t('default'))));
  }

  foreach ($form_state['values']['roles'] as $rid => $role) {
    $uploadsize = $form_state['values']['upload_uploadsize_'. $rid];
    $usersize = $form_state['values']['upload_usersize_'. $rid];

    if (!is_numeric($uploadsize) || ($uploadsize <= 0)) {
      form_set_error('upload_uploadsize_'. $rid, t('The %role file size limit must be a number and greater than zero.', array('%role' => $role)));
    }
    if (!is_numeric($usersize) || ($usersize <= 0)) {
      form_set_error('upload_usersize_'. $rid, t('The %role file size limit must be a number and greater than zero.', array('%role' => $role)));
    }
    if ($uploadsize > file_upload_max_size()) {
      form_set_error('upload_uploadsize_'. $rid, $exceed_max_msg . $more_info);
      $more_info = '';
    }
    if ($uploadsize > $usersize) {
      form_set_error('upload_uploadsize_'. $rid, t('The %role maximum file size per upload is greater than the total file size allowed per user', array('%role' => $role)));
    }
  }
}

/**
 * Menu callback for the upload settings form.
 */
function upload_admin_settings() {
  $upload_extensions_default = variable_get('upload_extensions_default', 'jpg jpeg gif png txt doc xls pdf ppt pps odt ods odp');
  $upload_uploadsize_default = variable_get('upload_uploadsize_default', 1);
  $upload_usersize_default = variable_get('upload_usersize_default', 1);

  $form['settings_general'] = array(
    '#type' => 'fieldset',
    '#title' => t('General settings'),
    '#collapsible' => TRUE,
  );
  $form['settings_general']['upload_max_resolution'] = array(
    '#type' => 'textfield',
    '#title' => t('Maximum resolution for uploaded images'),
    '#default_value' => variable_get('upload_max_resolution', 0),
    '#size' => 15,
    '#maxlength' => 10,
    '#description' => t('The maximum allowed image size (e.g. 640x480). Set to 0 for no restriction. If an <a href="!image-toolkit-link">image toolkit</a> is installed, files exceeding this value will be scaled down to fit.', array('!image-toolkit-link' => url('admin/settings/image-toolkit'))),
    '#field_suffix' => '<kbd>'. t('WIDTHxHEIGHT') .'</kbd>'
  );
  $form['settings_general']['upload_list_default'] = array(
    '#type' => 'select',
    '#title' => t('List files by default'),
    '#default_value' => variable_get('upload_list_default', 1),
    '#options' => array(0 => t('No'), 1 => t('Yes')),
    '#description' => t('Display attached files when viewing a post.'),
  );

  $form['settings_general']['upload_extensions_default'] = array(
    '#type' => 'textfield',
    '#title' => t('Default permitted file extensions'),
    '#default_value' => $upload_extensions_default,
    '#maxlength' => 255,
    '#description' => t('Default extensions that users can upload. Separate extensions with a space and do not include the leading dot.'),
  );
  $form['settings_general']['upload_uploadsize_default'] = array(
    '#type' => 'textfield',
    '#title' => t('Default maximum file size per upload'),
    '#default_value' => $upload_uploadsize_default,
    '#size' => 5,
    '#maxlength' => 5,
    '#description' => t('The default maximum file size a user can upload. If an image is uploaded and a maximum resolution is set, the size will be checked after the file has been resized.'),
    '#field_suffix' => t('MB'),
  );
  $form['settings_general']['upload_usersize_default'] = array(
    '#type' => 'textfield',
    '#title' => t('Default total file size per user'),
    '#default_value' => $upload_usersize_default,
    '#size' => 5,
    '#maxlength' => 5,
    '#description' => t('The default maximum size of all files a user can have on the site.'),
    '#field_suffix' => t('MB'),
  );

  $form['settings_general']['upload_max_size'] = array('#value' => '<p>'. t('Your PHP settings limit the maximum file size per upload to %size.', array('%size' => format_size(file_upload_max_size()))) .'</p>');

  $roles = user_roles(0, 'upload files');
  $form['roles'] = array('#type' => 'value', '#value' => $roles);

  foreach ($roles as $rid => $role) {
    $form['settings_role_'. $rid] = array(
      '#type' => 'fieldset',
      '#title' => t('Settings for @role', array('@role' => $role)),
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
    );
    $form['settings_role_'. $rid]['upload_extensions_'. $rid] = array(
      '#type' => 'textfield',
      '#title' => t('Permitted file extensions'),
      '#default_value' => variable_get('upload_extensions_'. $rid, $upload_extensions_default),
      '#maxlength' => 255,
      '#description' => t('Extensions that users in this role can upload. Separate extensions with a space and do not include the leading dot.'),
    );
    $form['settings_role_'. $rid]['upload_uploadsize_'. $rid] = array(
      '#type' => 'textfield',
      '#title' => t('Maximum file size per upload'),
      '#default_value' => variable_get('upload_uploadsize_'. $rid, $upload_uploadsize_default),
      '#size' => 5,
      '#maxlength' => 5,
      '#description' => t('The maximum size of a file a user can upload. If an image is uploaded and a maximum resolution is set, the size will be checked after the file has been resized.'),
      '#field_suffix' => t('MB'),
    );
    $form['settings_role_'. $rid]['upload_usersize_'. $rid] = array(
      '#type' => 'textfield',
      '#title' => t('Total file size per user'),
      '#default_value' => variable_get('upload_usersize_'. $rid, $upload_usersize_default),
      '#size' => 5,
      '#maxlength' => 5,
      '#description' => t('The maximum size of all files a user can have on the site.'),
      '#field_suffix' => t('MB'),
    );
  }

  $form['#validate'] = array('upload_admin_settings_validate');

  return system_settings_form($form);
}