ngtcp2_pkt_decode_hd_short
==========================

Synopsis
--------

*#include <ngtcp2/ngtcp2.h>*

.. function:: ngtcp2_ssize ngtcp2_pkt_decode_hd_short(ngtcp2_pkt_hd *dest, const uint8_t *pkt, size_t pktlen, size_t dcidlen)

    
    `ngtcp2_pkt_decode_hd_short` decodes QUIC short header in *pkt* of
    length *pktlen*.  Short header packet does not encode the length of
    Connection ID, thus we need the input from the outside.  *dcidlen*
    is the length of Destination Connection ID in packet header.  This
    function only parses the input just before packet number field.
    This function can handle Connection ID up to
    :macro:`NGTCP2_MAX_CIDLEN`.  Consider to use
    `ngtcp2_pkt_decode_version_cid` to get longer Connection ID.  It
    stores the result in the object pointed by *dest*, and returns the
    number of bytes decoded to read the packet header if it succeeds,
    or one of the following error codes:
    
    :macro:`NGTCP2_ERR_INVALID_ARGUMENT`
        Packet is too short; or it is not a short header