/* * Unaligned Data Accesses -- Generic Version, Network Order * * (c) 2000 Martin Mares <mj@ucw.cz> * * Can be freely distributed and used under the terms of the GNU GPL. */ #ifndef _BIRD_UNALIGNED_H_ #define _BIRD_UNALIGNED_H_ /* * We don't do any clever tricks with unaligned accesses since it's * virtually impossible to figure out what alignment does the CPU want * (unaligned accesses can be emulated by the OS which makes them work, * but unusably slow). We use memcpy and hope GCC will optimize it out * if possible. */ #include "lib/string.h" static inline u16 get_u16(const void *p) { u16 x; memcpy(&x, p, 2); return ntohs(x); } static inline u32 get_u32(const void *p) { u32 x; memcpy(&x, p, 4); return ntohl(x); } static inline u64 get_u64(const void *p) { u32 xh, xl; memcpy(&xh, p, 4); memcpy(&xl, p+4, 4); return (((u64) ntohl(xh)) << 32) | ntohl(xl); } static inline void put_u16(void *p, u16 x) { x = htons(x); memcpy(p, &x, 2); } static inline void put_u32(void *p, u32 x) { x = htonl(x); memcpy(p, &x, 4); } static inline void put_u64(void *p, u64 x) { u32 xh, xl; xh = htonl(x >> 32); xl = htonl((u32) x); memcpy(p, &xh, 4); memcpy(p+4, &xl, 4); } #endif