Function libhydrogen_sys::hydro_hex2bin

pub unsafe extern "C" fn hydro_hex2bin(
    bin: *mut u8, 
    bin_maxlen: usize, 
    hex: *const c_char, 
    hex_len: usize, 
    ignore: *const c_char, 
    bin_len: *mut usize, 
    hex_end: *mut *const c_char
) -> c_int