Function olm_sys::olm_decrypt_max_plaintext_length

pub unsafe extern "C" fn olm_decrypt_max_plaintext_length(
    session: *mut OlmSession, 
    message_type: usize, 
    message: *mut c_void, 
    message_length: usize
) -> usize

The maximum number of bytes of plain-text a given message could decode to. The actual size could be different due to padding. The input message buffer is destroyed. Returns olm_error() on failure. If the message base64 couldn’t be decoded then olm_session_last_error() will be “INVALID_BASE64”. If the message is for an unsupported version of the protocol then olm_session_last_error() will be “BAD_MESSAGE_VERSION”. If the message couldn’t be decoded then olm_session_last_error() will be “BAD_MESSAGE_FORMAT”.