What is the most efficient way to read from the end of a file in c++? (Parsing last 128 bits in a file)

Question

我可以想到一些快速读取最后128位的方法，但哪种方式最简单，最有效？

Answer 1

Jump to the end and read:

char buf[16];

std::ifstream infile("thefile.bin", std::ios::binary);
infile.seekg(16, std::ios::end);

if (!infile || !infile.read(buf, 16))
{
    // error! Maybe die.
}

// process buf