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#include "my-endian.h"
/* rotates 2 bytes */
unsigned short swap2(u_2bytes In) {
u_2bytes Out;
((char*)&(Out))[0] = ((char*)&(In))[1];
((char*)&(Out))[1] = ((char*)&(In))[0];
return Out;
}
/* rotates 4 bytes */
u_4bytes rotate4(u_4bytes In) {
u_4bytes Out;
((u_2bytes*)&Out)[0] = swap2(((u_2bytes*)&In)[1]);
((u_2bytes*)&Out)[1] = swap2(((u_2bytes*)&In)[0]);
return Out;
}
/* detects endian-ness
* Note: will not work if sizeof(unsigned long)==1
*/
int IsLittleEndian(void) {
static const unsigned long long_number = 1;
return *(const unsigned char *)&long_number;
}
/* changes endian-ness */
void ToOtherEndian(TEntry *e) {
/* unroll this loop if you want to enumerate u_4bytes members of TEntry_v2 */
u_4bytes *p;
for (p = &(e -> head.event_duration); p <= &(e -> url); p++)
*p = rotate4(*p);
e -> tail.status = swap2(e -> tail.status);
if (sizeof(method_t) == 2)
e -> tail.method = swap2(e -> tail.method);
else
if (sizeof(method_t) == 4)
e -> tail.method = rotate4(e -> tail.method);
if (sizeof(protocol_t) == 2)
e -> tail.protocol = swap2(e -> tail.protocol);
else
if (sizeof(protocol_t) == 4)
e -> tail.protocol = rotate4(e -> tail.protocol);
}
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