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#pragma once
/**
@file
@brief deal with big and little endian
@author MITSUNARI Shigeo(@herumi)
*/
#include <cybozu/inttype.hpp>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
namespace cybozu {
#ifdef _MSC_VER
inline uint16_t byteSwap(uint16_t x) { return _byteswap_ushort(x); }
inline uint32_t byteSwap(uint32_t x) { return _byteswap_ulong(x); }
inline uint64_t byteSwap(uint64_t x) { return _byteswap_uint64(x); }
#else
#if (((__GNUC__) << 16) + (__GNUC_MINOR__)) >= ((4 << 16) + 8)
inline uint16_t byteSwap(uint16_t x) { return __builtin_bswap16(x); }
#else
inline uint16_t byteSwap(uint16_t x) { return (x >> 8) | (x << 8); }
#endif
inline uint32_t byteSwap(uint32_t x) { return __builtin_bswap32(x); }
inline uint64_t byteSwap(uint64_t x) { return __builtin_bswap64(x); }
#endif
/**
get 16bit integer as little endian
@param src [in] pointer
*/
inline uint16_t Get16bitAsLE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint16_t x;
memcpy(&x, src, sizeof(x));
return x;
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return p[0] | (p[1] << 8);
#endif
}
/**
get 32bit integer as little endian
@param src [in] pointer
*/
inline uint32_t Get32bitAsLE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint32_t x;
memcpy(&x, src, sizeof(x));
return x;
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return Get16bitAsLE(p) | (static_cast<uint32_t>(Get16bitAsLE(p + 2)) << 16);
#endif
}
/**
get 64bit integer as little endian
@param src [in] pointer
*/
inline uint64_t Get64bitAsLE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint64_t x;
memcpy(&x, src, sizeof(x));
return x;
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return Get32bitAsLE(p) | (static_cast<uint64_t>(Get32bitAsLE(p + 4)) << 32);
#endif
}
/**
get 16bit integer as bit endian
@param src [in] pointer
*/
inline uint16_t Get16bitAsBE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint16_t x;
memcpy(&x, src, sizeof(x));
return byteSwap(x);
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return p[1] | (p[0] << 8);
#endif
}
/**
get 32bit integer as bit endian
@param src [in] pointer
*/
inline uint32_t Get32bitAsBE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint32_t x;
memcpy(&x, src, sizeof(x));
return byteSwap(x);
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return Get16bitAsBE(p + 2) | (static_cast<uint32_t>(Get16bitAsBE(p)) << 16);
#endif
}
/**
get 64bit integer as big endian
@param src [in] pointer
*/
inline uint64_t Get64bitAsBE(const void *src)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
uint64_t x;
memcpy(&x, src, sizeof(x));
return byteSwap(x);
#else
const uint8_t *p = static_cast<const uint8_t *>(src);
return Get32bitAsBE(p + 4) | (static_cast<uint64_t>(Get32bitAsBE(p)) << 32);
#endif
}
/**
set 16bit integer as little endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set16bitAsLE(void *src, uint16_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
p[0] = static_cast<uint8_t>(x);
p[1] = static_cast<uint8_t>(x >> 8);
#endif
}
/**
set 32bit integer as little endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set32bitAsLE(void *src, uint32_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
p[0] = static_cast<uint8_t>(x);
p[1] = static_cast<uint8_t>(x >> 8);
p[2] = static_cast<uint8_t>(x >> 16);
p[3] = static_cast<uint8_t>(x >> 24);
#endif
}
/**
set 64bit integer as little endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set64bitAsLE(void *src, uint64_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
Set32bitAsLE(p, static_cast<uint32_t>(x));
Set32bitAsLE(p + 4, static_cast<uint32_t>(x >> 32));
#endif
}
/**
set 16bit integer as big endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set16bitAsBE(void *src, uint16_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
x = byteSwap(x);
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
p[0] = static_cast<uint8_t>(x >> 8);
p[1] = static_cast<uint8_t>(x);
#endif
}
/**
set 32bit integer as big endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set32bitAsBE(void *src, uint32_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
x = byteSwap(x);
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
p[0] = static_cast<uint8_t>(x >> 24);
p[1] = static_cast<uint8_t>(x >> 16);
p[2] = static_cast<uint8_t>(x >> 8);
p[3] = static_cast<uint8_t>(x);
#endif
}
/**
set 64bit integer as big endian
@param src [out] pointer
@param x [in] integer
*/
inline void Set64bitAsBE(void *src, uint64_t x)
{
#if CYBOZU_ENDIAN == CYBOZU_ENDIAN_LITTLE
x = byteSwap(x);
memcpy(src, &x, sizeof(x));
#else
uint8_t *p = static_cast<uint8_t *>(src);
Set32bitAsBE(p, static_cast<uint32_t>(x >> 32));
Set32bitAsBE(p + 4, static_cast<uint32_t>(x));
#endif
}
} // cybozu
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