nmdb: Add LevelDB support

[nmdb.git] / nmdb / netutils.c

#include <arpa/inet.h>          /* htonl() and friends */
#include "netutils.h"


/* ntohll() and htonll() are not standard, so we define it using an UGLY trick
 * because there is no standard way to check for endianness at runtime! */
uint64_t ntohll(uint64_t x)
{
        static int endianness = 0;

        /* determine the endianness by checking how htonl() behaves; use -1
         * for little endian and 1 for big endian */
        if (endianness == 0) {
                if (htonl(1) == 1)
                        endianness = 1;
                else
                        endianness = -1;
        }

        if (endianness == 1) {
                /* big endian */
                return x;
        }

        /* little endian */
        return ( ntohl( (x >> 32) & 0xFFFFFFFF ) | \
                        ( (uint64_t) ntohl(x & 0xFFFFFFFF) ) << 32 );
}

uint64_t htonll(uint64_t x)
{
        static int endianness = 0;

        /* determine the endianness by checking how htonl() behaves; use -1
         * for little endian and 1 for big endian */
        if (endianness == 0) {
                if (htonl(1) == 1)
                        endianness = 1;
                else
                        endianness = -1;
        }

        if (endianness == 1) {
                /* big endian */
                return x;
        }

        /* little endian */
        return ( htonl( (x >> 32) & 0xFFFFFFFF ) | \
                        ( (uint64_t) htonl(x & 0xFFFFFFFF) ) << 32 );
}