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Merge pull request #1768 from lioncash/swap 

Swap: Minor changes
This commit is contained in:
bunnei 2016-05-09 09:04:15 -04:00
parent 282a2ad539 d5b983a8c0
commit 3c3831906b
1 changed files with 22 additions and 46 deletions
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68
src/common/swap.h
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@ -25,6 +25,8 @@
#include <sys/endian.h> #include <sys/endian.h>
#endif #endif
#include <cstring>
#include "common/common_types.h" #include "common/common_types.h"
// GCC 4.6+ // GCC 4.6+
@ -58,9 +60,6 @@
namespace Common { namespace Common {
inline u8 swap8(u8 _data) {return _data;}
inline u32 swap24(const u8* _data) {return (_data[0] << 16) | (_data[1] << 8) | _data[2];}
#ifdef _MSC_VER #ifdef _MSC_VER
inline u16 swap16(u16 _data) {return _byteswap_ushort(_data);} inline u16 swap16(u16 _data) {return _byteswap_ushort(_data);}
inline u32 swap32(u32 _data) {return _byteswap_ulong (_data);} inline u32 swap32(u32 _data) {return _byteswap_ulong (_data);}
@ -92,52 +91,29 @@ inline u64 swap64(u64 data) {return ((u64)swap32(data) << 32) | swap32(data >> 3
#endif #endif
inline float swapf(float f) { inline float swapf(float f) {
union { static_assert(sizeof(u32) == sizeof(float),
float f; "float must be the same size as uint32_t.");
unsigned int u32;
} dat1, dat2;
dat1.f = f; u32 value;
dat2.u32 = swap32(dat1.u32); std::memcpy(&value, &f, sizeof(u32));
return dat2.f; value = swap32(value);
std::memcpy(&f, &value, sizeof(u32));
return f;
} }
inline double swapd(double f) { inline double swapd(double f) {
union { static_assert(sizeof(u64) == sizeof(double),
double f; "double must be the same size as uint64_t.");
unsigned long long u64;
} dat1, dat2;
dat1.f = f; u64 value;
dat2.u64 = swap64(dat1.u64); std::memcpy(&value, &f, sizeof(u64));
return dat2.f; value = swap64(value);
} std::memcpy(&f, &value, sizeof(u64));
inline u16 swap16(const u8* _pData) {return swap16(*(const u16*)_pData);} return f;
inline u32 swap32(const u8* _pData) {return swap32(*(const u32*)_pData);}
inline u64 swap64(const u8* _pData) {return swap64(*(const u64*)_pData);}
template <int count>
void swap(u8*);
template <>
inline void swap<1>(u8* data) { }
template <>
inline void swap<2>(u8* data) {
*reinterpret_cast<u16*>(data) = swap16(data);
}
template <>
inline void swap<4>(u8* data) {
*reinterpret_cast<u32*>(data) = swap32(data);
}
template <>
inline void swap<8>(u8* data) {
*reinterpret_cast<u64*>(data) = swap64(data);
} }
} // Namespace Common } // Namespace Common
@ -534,35 +510,35 @@ bool operator==(const S &p, const swap_struct_t<T, F> v) {
template <typename T> template <typename T>
struct swap_64_t { struct swap_64_t {
static T swap(T x) { static T swap(T x) {
return (T)Common::swap64(*(u64 *)&x); return static_cast<T>(Common::swap64(x));
} }
}; };
template <typename T> template <typename T>
struct swap_32_t { struct swap_32_t {
static T swap(T x) { static T swap(T x) {
return (T)Common::swap32(*(u32 *)&x); return static_cast<T>(Common::swap32(x));
} }
}; };
template <typename T> template <typename T>
struct swap_16_t { struct swap_16_t {
static T swap(T x) { static T swap(T x) {
return (T)Common::swap16(*(u16 *)&x); return static_cast<T>(Common::swap16(x));
} }
}; };
template <typename T> template <typename T>
struct swap_float_t { struct swap_float_t {
static T swap(T x) { static T swap(T x) {
return (T)Common::swapf(*(float *)&x); return static_cast<T>(Common::swapf(x));
} }
}; };
template <typename T> template <typename T>
struct swap_double_t { struct swap_double_t {
static T swap(T x) { static T swap(T x) {
return (T)Common::swapd(*(double *)&x); return static_cast<T>(Common::swapd(x));
} }
}; };