Function mupdf_sys::fz_open_arc4

pub unsafe extern "C" fn fz_open_arc4(
    ctx: *mut fz_context, 
    chain: *mut fz_stream, 
    key: *mut c_uchar, 
    keylen: c_uint
) -> *mut fz_stream

arc4 filter performs RC4 decoding of data read from the chained filter using the supplied key.