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57 void net_checksum_calculate(uint8_t *data, int length)
62     if ((data[14] & 0xf0) != 0x40)
64     hlen  = (data[14] & 0x0f) * 4;
65     plen  = (data[16] << 8 | data[17]) - hlen;
66     proto = data[23];
82     data[14+hlen+csum_offset]   = 0;
83     data[14+hlen+csum_offset+1] = 0;
84     csum = net_checksum_tcpudp(plen, proto, data+14+12, data+14+hlen);
85     data[14+hlen+csum_offset]   = csum >> 8;
86     data[14+hlen+csum_offset+1] = csum & 0xff;