Big endian machine: It thinks the first byte it reads is the biggest.
Little endian machine: It thinks the first byte it reads is the littlest.
举个例子,从内存地址0x0000开始有以下数据
0x00000x12
0x00010x34
0x00020xab
0x00030xcd
如果我们去读取一个地址为0x0000的四个字节变量,若字节序为big-endian,则读出
结果为0x1234abcd;若字节序位little-endian,则读出结果为0xcdab3412.
如果我们将0x1234abcd写入到以0x0000开始的内存中,则结果为
big-endianlittle-endian
0x00000x120xcd
0x00010x340xab
0x00020xab0x34
0x00030xcd0x12
x86系列CPU都是little-endian的字节序.