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{ 
  // Saving only the main portion of the uploaded file's name, without the file extension.
  Configuration::updateValue(
    'BLOCKADVERT_IMG_EXT', 
    substr($_FILES['adv_img']['name'], strrpos($_FILES['adv_img']['name'], '.') + 1)
    );

  // Setting the image name with a name contextual to the shop context.
  $this->adv_imgname = 'advertising';

  // Creating two versions of the contextual name, depending on the context.
  if (Shop::getContext() == Shop::CONTEXT_GROUP)
    $this->adv_imgname = 'advertising'.'-g'.(int)$this->context->shop->getContextShopGroupID();
  elseif (Shop::getContext() == Shop::CONTEXT_SHOP)
    $this->adv_imgname = 'advertising'.'-s'.(int)$this->context->shop->getContextShopID();

  // Copying the image in the module directory with its new contextual name.
  if (!move_uploaded_file($_FILES['adv_img']['tmp_name'], 
    _PS_MODULE_DIR_.$this->name.'/'.$this->adv_imgname.'.'.Configuration::get('BLOCKADVERT_IMG_EXT')))
    $errors .= $this->l('File upload error.');
}

protected function initialize()
{
  // Setting the main name of the image.
  $this->adv_imgname = 'advertising';

  // Setting the contextual name of the file, depending on the context.
  if ((Shop::getContext() == Shop::CONTEXT_GROUP  || Shop::getContext() == Shop::CONTEXT_SHOP)
    && file_exists(_PS_MODULE_DIR_.$this->name.'/'.$this->adv_imgname.'-g'
    .$this->context->shop->getContextShopGroupID().'.'.Configuration::get('BLOCKADVERT_IMG_EXT')))
    $this->adv_imgname .= '-g'.$this->context->shop->getContextShopGroupID();
  if (Shop::getContext() == Shop::CONTEXT_SHOP
    && file_exists(_PS_MODULE_DIR_.$this->name.'/'.$this->adv_imgname.'-s'
    .$this->context->shop->getContextShopID().'.'.Configuration::get('BLOCKADVERT_IMG_EXT')))
    $this->adv_imgname .= '-s'.$this->context->shop->getContextShopID();
  $this->adv_img = Tools::getMediaServer($this->name)._MODULE_DIR_.$this->name.'/'
    .$this->adv_imgname.'.'.Configuration::get('BLOCKADVERT_IMG_EXT');
}