interface ExifInterface

interface ExifInterface {
    
    /**
     * Return drupal fields related to this extension.
     *
     * Going through all the fields that have been created for a given node type
     * and try to figure out which match the naming convention -> so that we know
     * which exif information we have to read.
     *
     * Naming convention are: field_exif_xxx (xxx would be the name of the exif
     * tag to read.
     *
     * @param array $arCckFields
     *   CCK fields.
     *
     * @return array
     *   List of exif tags to read for this image
     */
    public function getMetadataFields(array $arCckFields = []);
    
    /**
     * Retrieve all metadata from a file.
     *
     * @param string $file
     *   File to read metadata from.
     * @param bool $enable_sections
     *   Should sections should be also retrieved.
     *
     * @return array
     *   metadata keys and associated values.
     */
    public function readMetadataTags($file, $enable_sections = TRUE);
    
    /**
     * Get all supported keys.
     *
     * @return array
     *   Keys by sections.
     */
    public function getFieldKeys();

}