pub unsafe extern "system" fn GetFilePatchSignatureA(
    filename: PCSTR,
    optionflags: u32,
    optiondata: *const c_void,
    ignorerangecount: u32,
    ignorerangearray: *const PATCH_IGNORE_RANGE,
    retainrangecount: u32,
    retainrangearray: *const PATCH_RETAIN_RANGE,
    signaturebuffersize: u32,
    signaturebuffer: PSTR,
) -> BOOL