Big and little indian valid in a byte??

[syedk <syedk@intoto.com>]

Hi All,

     This is the structure declaration of IP Header. Can you tell me how 
little endian  and big endian come into picture in the case of  a 
byte.   U can find this declaration in 
/usr/src/linux-2.4.18-14/include/linux/ip.h.

struct iphdr {
#if defined(__LITTLE_ENDIAN_BITFIELD)
         __u8    ihl:4,
                 version:4;
#elif defined (__BIG_ENDIAN_BITFIELD)
         __u8    version:4,
                 ihl:4;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
         __u8    tos;
         __u16   tot_len;
         __u16   id;
         __u16   frag_off;
         __u8    ttl;
         __u8    protocol;
         __u16   check;
         __u32   saddr;
         __u32   daddr;
         /*The options start here. */
};

Thanks,
syed k



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