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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
#pragma once
#include <type_traits>
#include "acconfig.h"
#include "int_types.h"
#ifdef __GNUC__
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint16_t), T>::type
swab(T val) {
return __builtin_bswap16(val);
}
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint32_t), T>::type
swab(T val) {
return __builtin_bswap32(val);
}
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint64_t), T>::type
swab(T val) {
return __builtin_bswap64(val);
}
#else
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint16_t), T>::type
swab(T val) {
return (val >> 8) | (val << 8);
}
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint32_t), T>::type
swab(T val) {
return (( val >> 24) |
((val >> 8) & 0xff00) |
((val << 8) & 0xff0000) |
((val << 24)));
}
template<typename T>
inline typename std::enable_if<sizeof(T) == sizeof(uint64_t), T>::type
swab(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)));
}
#endif
// mswab == maybe swab (if not LE)
#ifdef CEPH_BIG_ENDIAN
template<typename T>
inline T mswab(T val) {
return swab(val);
}
#else
template<typename T>
inline T mswab(T val) {
return val;
}
#endif
template<typename T>
struct ceph_le {
T v;
ceph_le<T>& operator=(T nv) {
v = mswab(nv);
return *this;
}
operator T() const { return mswab(v); }
} __attribute__ ((packed));
template<typename T>
inline bool operator==(ceph_le<T> a, ceph_le<T> b) {
return a.v == b.v;
}
using ceph_le64 = ceph_le<__u64>;
using ceph_le32 = ceph_le<__u32>;
using ceph_le16 = ceph_le<__u16>;
inline ceph_le64 init_le64(__u64 x) {
ceph_le64 v;
v = x;
return v;
}
inline ceph_le32 init_le32(__u32 x) {
ceph_le32 v;
v = x;
return v;
}
inline ceph_le16 init_le16(__u16 x) {
ceph_le16 v;
v = x;
return v;
}
/*
#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)
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