fjqisba/eazylib

eazylib's Issues

循环右移

unsigned int 循环左移(unsigned int value, int shift);
unsigned int 循环右移(unsigned int value, int shift);

unsigned int 循环左移(unsigned int value, int shift)
{
int max_bits = sizeof(unsigned int) << 3;
if (shift < 0)
{
return 循环右移(value, -shift);
}
if (shift > max_bits)
{
shift = shift % max_bits;
}
return (value << shift) | (value >> (max_bits - shift));
}

unsigned int 循环右移(unsigned int value, int shift)
{
int max_bits = sizeof(unsigned int) << 3;
if (shift < 0)
{
return 循环左移(value, -shift);
}
if (shift > max_bits)
{
shift = shift % max_bits;
}
return (value >> shift) | (value << (max_bits - shift));
}

Base64编码

参考附件
Base64.zip