Function encoding_c_mem::encoding_mem_check_utf8_for_latin1_and_bidi

#[no_mangle]
pub unsafe extern "C" fn encoding_mem_check_utf8_for_latin1_and_bidi(
    buffer: *const u8, 
    len: usize
) -> Latin1Bidi

Checks whether a potentially invalid UTF-8 buffer contains code points that trigger right-to-left processing or is all-Latin1.

Possibly more efficient than performing the checks separately.

Returns Latin1Bidi::Latin1 if is_utf8_latin1() would return true. Otherwise, returns Latin1Bidi::Bidi if is_utf8_bidi() would return true. Otherwise, returns Latin1Bidi::LeftToRight.

Undefined behavior

UB ensues if buffer and buffer_len don't designate a valid memory block or if buffer is NULL. (If buffer_len is 0, buffer may be bogus but still has to be non-NULL.)