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c语言小端转大端

 

//小端转大端
int little2big(int le) {

return (le & 0xff) << 24
| (le & 0xff00) << 8
| (le & 0xff0000) >> 8
| (le >> 24) & 0xff;
}

//大端转小端
int big2little(int be)
{
return ((be >> 24) &0xff )
| ((be >> 8) & 0xFF00)
| ((be << 8) & 0xFF0000)
| ((be << 24));
}

short大小端转换

小端转大端
short little2bigs(short num)
{
short swapped = (num >> 8) | (num << 8);
return swapped;
}

大端转小端
short big2littles(short be)
{
short swapped = (be << 8) | (be >> 8);
return swapped;
}

32大端转小端原理

swapped = ((num>>24)&0xff) | // move byte 3 to byte 0
((num<<8)&0xff0000) | // move byte 1 to byte 2
((num>>8)&0xff00) | // move byte 2 to byte 1
((num<<24)&0xff000000); // byte 0 to byte 3

内置函数(传入大端转小端,小端转大端,以下同理)

16位无符号,大小端转换

unsigned short _byteswap_ushort(unsigned short

32位无符号,大小端转换

unsigned long _byteswap_ulong(unsigned long

64位无符号,大小端转换

unsigned __int64 _byteswap_uint64(unsigned __int64 value);

 

​​convert big endian to little endian in C [without using provided func]​​

 ​​Converting Little Endian to Big Endian​​

​​How do I convert between big-endian and little-endian values in C++?​​

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