file.devel_generate.inc

<?php

function file_devel_generate($object, $field, $instance, $bundle) {
    if (field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_CUSTOM) {
        return devel_generate_multiple('_file_devel_generate', $object, $field, $instance, $bundle);
    }
    else {
        return _file_devel_generate($object, $field, $instance, $bundle);
    }
}
function _file_devel_generate($object, $field, $instance, $bundle) {
    static $file;
    if (empty($file)) {
        if ($path = devel_generate_textfile()) {
            $destination_dir = $field['settings']['uri_scheme'] . '://' . $instance['settings']['file_directory'];
            file_prepare_directory($destination_dir, FILE_CREATE_DIRECTORY);
            if ($uri = file_unmanaged_move($path, $destination_dir)) {
                $file = new stdClass();
                $file->fid = NULL;
                $file->uri = $uri;
                $file->filename = drupal_basename($uri);
                $file->filemime = file_get_mimetype($file->uri);
                // @todo Randomize file owner.
                $file->uid = 1;
                $file->devel_generate = TRUE;
                $file = file_save($file);
            }
            else {
                return FALSE;
            }
        }
        else {
            return FALSE;
        }
    }
    if (!$file) {
        // In case a previous file operation failed or no file is set, return FALSE
        return FALSE;
    }
    else {
        $object_field['fid'] = $file->fid;
        $object_field['display'] = $field['settings']['display_default'];
        $object_field['description'] = devel_create_greeking(10);
        return $object_field;
    }
}

/**
 * Private function for generating a random text file.
 */
function devel_generate_textfile($filesize = 1024) {
    if ($tmp_file = drupal_tempnam('temporary://', 'filefield_')) {
        $destination = $tmp_file . '.txt';
        file_unmanaged_move($tmp_file, $destination);
        $fp = fopen($destination, 'w');
        fwrite($fp, str_repeat('01', $filesize / 2));
        fclose($fp);
        return $destination;
    }
}