integer_to_wkb_buf()

static uint8_t* integer_to_wkb_buf ( const int  ival, uint8_t *  buf, uint8_t  variant  )

static

Definition at line 196 of file lwout_wkb.c.

References hexchr, LWDEBUGF, lwerror(), WKB_HEX, WKB_INT_SIZE, and wkb_swap_bytes().

Referenced by empty_to_wkb_buf(), lwcollection_to_wkb_buf(), lwline_to_wkb_buf(), lwpoint_to_wkb_buf(), lwpoly_to_wkb_buf(), lwtriangle_to_wkb_buf(), and ptarray_to_wkb_buf().

{
        char *iptr = (char*)(&ival);
        int i = 0;

        if ( sizeof(int) != WKB_INT_SIZE )
        {
                lwerror("Machine int size is not %d bytes!", WKB_INT_SIZE);
        }
        LWDEBUGF(4, "Writing value '%u'", ival);
        if ( variant & WKB_HEX )
        {
                int swap = wkb_swap_bytes(variant);
                /* Machine/request arch mismatch, so flip byte order */
                for ( i = 0; i < WKB_INT_SIZE; i++ )
                {
                        int j = (swap ? WKB_INT_SIZE - 1 - i : i);
                        uint8_t b = iptr[j];
                        /* 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 * WKB_INT_SIZE);
        }
        else
        {
                /* Machine/request arch mismatch, so flip byte order */
                if ( wkb_swap_bytes(variant) )
                {
                        for ( i = 0; i < WKB_INT_SIZE; i++ )
                        {
                                buf[i] = iptr[WKB_INT_SIZE - 1 - i];
                        }
                }
                /* If machine arch and requested arch match, don't flip byte order */
                else
                {
                        memcpy(buf, iptr, WKB_INT_SIZE);
                }
                return buf + WKB_INT_SIZE;
        }
}

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