_varint_u64_encode_buf()

static size_t _varint_u64_encode_buf ( uint64_t  val, uint8_t *  buf  )

static

Definition at line 34 of file varint.c.

References lwerror().

Referenced by varint_s32_encode_buf(), varint_s64_encode_buf(), varint_u32_encode_buf(), and varint_u64_encode_buf().

{
        uint8_t grp;
        uint64_t q = val;
        uint8_t *ptr = buf;
        while (1)
        {
                /* We put the 7 least significant bits in grp */
                grp = 0x7f & q;
                /* We rightshift our input value 7 bits */
                /* which means that the 7 next least significant bits */
                /* becomes the 7 least significant */
                q = q >> 7;
                /* Check if, after our rightshifting, we still have */
                /* anything to read in our input value. */
                if ( q > 0 )
                {
                        /* In the next line quite a lot is happening. */
                        /* Since there is more to read in our input value */
                        /* we signal that by setting the most siginicant bit */
                        /* in our byte to 1. */
                        /* Then we put that byte in our buffer and move the pointer */
                        /* forward one step */
                        *ptr = 0x80 | grp;
                        ptr++;
                }
                else
                {
                        /* The same as above, but since there is nothing more */
                        /* to read in our input value we leave the most significant bit unset */
                        *ptr = grp;
                        ptr++;
                        return ptr - buf;
                }
        }
        /* This cannot happen */
        lwerror("%s: Got out of infinite loop. Consciousness achieved.", __func__);
        return (size_t)0;
}

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