ngtcp2_pkt_write_stateless_reset
================================

Synopsis
--------

*#include <ngtcp2/ngtcp2.h>*

.. function:: ngtcp2_ssize ngtcp2_pkt_write_stateless_reset( uint8_t *dest, size_t destlen, const uint8_t *stateless_reset_token, const uint8_t *rand, size_t randlen)

    
    `ngtcp2_pkt_write_stateless_reset` writes Stateless Reset packet in
    the buffer pointed by *dest* whose length is *destlen*.
    *stateless_reset_token* is a pointer to the Stateless Reset Token,
    and its length must be :macro:`NGTCP2_STATELESS_RESET_TOKENLEN`
    bytes long.  *rand* specifies the random octets preceding Stateless
    Reset Token.  The length of *rand* is specified by *randlen* which
    must be at least :macro:`NGTCP2_MIN_STATELESS_RESET_RANDLEN` bytes
    long.
    
    If *randlen* is too long to write them all in the buffer, *rand* is
    written to the buffer as much as possible, and is truncated.
    
    This function returns the number of bytes written to the buffer, or
    one of the following negative error codes:
    
    :macro:`NGTCP2_ERR_NOBUF`
        Buffer is too small.
    :macro:`NGTCP2_ERR_INVALID_ARGUMENT`
        *randlen* is strictly less than
        :macro:`NGTCP2_MIN_STATELESS_RESET_RANDLEN`.