file_build_uri($path) Constructs a URI to Drupal's default files location given a relative path.
Default mode for new files. See drupal_chmod()
file_stream_wrapper_valid_scheme($scheme) Checks that the scheme of a stream URI is valid.
file_unmanaged_delete($path) Deletes a file without database changes or hook invocations.
file_unmunge_filename($filename) Undoes the effect of
drupal_tempnam($directory, $prefix) Creates a file with a unique filename in the specified directory.
file_upload_max_size() Determines the maximum file upload size by querying the PHP settings.
file_munge_filename($filename, $extensions, $alerts = TRUE) Modifies a filename as needed for security purposes
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