Integer serialization
=========================
Serialized format is type and architecture independent, number of bytes generated depends only on value. 
Maximum integer size to be serialized is 64 bits.

Bits in first byte byte NNNNSxxx:
    • NNNN number of follower bytes.
    • S sign, 0 for positive, 1 for negative.
    • xxx Least significant 3 data bits.

Follower bytes hold the remaining data bits.

Required defines:

::

    OSAL_SERIALIZE_SUPPORT = 1

Serializing an integer 
*****************************************************
The osal_intser_writer() function packs C integer x into buffer using serialization format.
The function returns number of bytes written to the buffer.

::

    os_int osal_intser_writer(
        os_char *buf,
        os_long x);

Reading an integer
*****************************************************
The osal_intser_reader() function converts integer from serialization format into 64 bit C integer x.
The function returns number of bytes read from the buffer.

::

    os_int osal_intser_reader(
        os_char *buf,
        os_long *x);

191026, 23.5.2020/pekka