double_nan_to_wkb_buf()

static uint8_t * double_nan_to_wkb_buf ( uint8_t *  buf, uint8_t  variant  )

static

Definition at line 241 of file lwout_wkb.c.

{
#define NAN_SIZE 8
        const uint8_t ndr_nan[NAN_SIZE] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0x7f};
        const uint8_t xdr_nan[NAN_SIZE] = {0x7f, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 
        if ( variant & WKB_HEX )
        {
                for (int i = 0; i < NAN_SIZE; i++)
                {
                        uint8_t b = (variant & WKB_NDR) ? ndr_nan[i] : xdr_nan[i];
                        /* Top four bits to 0-F */
                        buf[2*i] = hexchr[b >> 4];
                        /* Bottom four bits to 0-F */
                        buf[2*i + 1] = hexchr[b & 0x0F];
                }
                return buf + (2 * NAN_SIZE);
        }
        else
        {
                for (int i = 0; i < NAN_SIZE; i++)
                {
                        buf[i] = (variant & WKB_NDR) ? ndr_nan[i] : xdr_nan[i];;
                }
                return buf + NAN_SIZE;
        }
}

References hexchr, NAN_SIZE, variant, WKB_HEX, and WKB_NDR.

Referenced by empty_to_wkb_buf().

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