Converting a hex string to a byte array

Question

What is the best way to convert a variable length hex string e.g. \"01A1\" to a byte array containing that data.

i.e converting this:

st         


        

Answer 1

i've modified TheoretiCAL's code

uint8_t buf[32] = {};
std::string hex = "0123";
while (hex.length() % 2)
    hex = "0" + hex;
std::stringstream stream;
stream << std::hex << hex;

for (size_t i= 0; i > buf[i];