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/*
* byteorder.h
*
* LGPL 2
*/
#ifndef CEPH_BYTEORDER_H
#define CEPH_BYTEORDER_H
#if defined(__linux__)
#include <endian.h>
#elif defined(__FreeBSD__)
#include <sys/endian.h>
#else
#error "Your platform is not yet supported."
#endif
#if defined(__FreeBSD__)
#define __BYTE_ORDER _BYTE_ORDER
#define __BIG_ENDIAN _BIG_ENDIAN
#define __LITTLE_ENDIAN _LITTLE_ENDIAN
#endif
static __inline__ __u16 swab16(__u16 val)
{
return (val >> 8) | (val << 8);
}
static __inline__ __u32 swab32(__u32 val)
{
return (( val >> 24) |
((val >> 8) & 0xff00) |
((val << 8) & 0xff0000) |
((val << 24)));
}
static __inline__ uint64_t swab64(uint64_t val)
{
return (( val >> 56) |
((val >> 40) & 0xff00ull) |
((val >> 24) & 0xff0000ull) |
((val >> 8) & 0xff000000ull) |
((val << 8) & 0xff00000000ull) |
((val << 24) & 0xff0000000000ull) |
((val << 40) & 0xff000000000000ull) |
((val << 56)));
}
#if !defined(__BYTE_ORDER) || !defined(__BIG_ENDIAN) || !defined(__LITTLE_ENDIAN)
#error "Endianess is unknown!"
#endif
// mswab == maybe swab (if not LE)
#if __BYTE_ORDER == __BIG_ENDIAN
# define mswab64(a) swab64(a)
# define mswab32(a) swab32(a)
# define mswab16(a) swab16(a)
#else
# if __BYTE_ORDER != __LITTLE_ENDIAN
# warning __BYTE_ORDER is not defined, assuming little endian
# endif
# define mswab64(a) (a)
# define mswab32(a) (a)
# define mswab16(a) (a)
#endif
#define MAKE_LE_CLASS(bits) \
struct ceph_le##bits { \
__u##bits v; \
ceph_le##bits &operator=(__u##bits nv) { \
v = mswab##bits(nv); \
return *this; \
} \
operator __u##bits() const { return mswab##bits(v); } \
} __attribute__ ((packed)); \
static inline bool operator==(ceph_le##bits a, ceph_le##bits b) { \
return a.v == b.v; \
}
MAKE_LE_CLASS(64)
MAKE_LE_CLASS(32)
MAKE_LE_CLASS(16)
#undef MAKE_LE_CLASS
#define init_le64(x) { (__u64)mswab64(x) }
#define init_le32(x) { (__u32)mswab32(x) }
#define init_le16(x) { (__u16)mswab16(x) }
/*
#define cpu_to_le64(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_le16(x) (x)
*/
#define le64_to_cpu(x) ((uint64_t)x)
#define le32_to_cpu(x) ((__u32)x)
#define le16_to_cpu(x) ((__u16)x)
#endif
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