root/tags/1.3/wp-admin/includes/import.php

<?php

function get_importers() {
    global $wp_importers;
    uasort($wp_importers, create_function('$a, $b', 'return strcmp($a[0], $b[0]);'));
    return $wp_importers;
}

function register_importer( $id, $name, $description, $callback ) {
    global $wp_importers;
    if ( is_wp_error( $callback ) )
        return $callback;
    $wp_importers[$id] = array ( $name, $description, $callback );
}

function wp_import_cleanup( $id ) {
    wp_delete_attachment( $id );
}

function wp_import_handle_upload() {
    $overrides = array( 'test_form' => false, 'test_type' => false );
    $file = wp_handle_upload( $_FILES['import'], $overrides );

    if ( isset( $file['error'] ) )
        return $file;

    $url = $file['url'];
    $type = $file['type'];
    $file = addslashes( $file['file'] );
    $filename = basename( $file );

    // Construct the object array
    $object = array( 'post_title' => $filename,
        'post_content' => $url,
        'post_mime_type' => $type,
        'guid' => $url
    );

    // Save the data
    $id = wp_insert_attachment( $object, $file );

    return array( 'file' => $file, 'id' => $id );
}

?>