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Arduino/libraries/Ethernet/util.h

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#ifndef UTIL_H
#define UTIL_H
#define htons(x) ( (x)<<8 | ((x)>>8)&0xFF )
#define ntohs(x) htons(x)
#define htonl(x) ( ((x)<<24 & 0xFF000000UL) | \
((x)<< 8 & 0x00FF0000UL) | \
((x)>> 8 & 0x0000FF00UL) | \
((x)>>24 & 0x000000FFUL) )
#define ntohl(x) htonl(x)
#endif