Rust: How to read hex from file - file

Question

I want to read some data from a file in order to xor this with another sequence.
The content of the file is
00112233445566778899aabbccddeeff
The sequence this should be xored with is
000102030405060708090a0b0c0d0e0f
The result should be:
00102030405060708090a0b0c0d0e0f0
The reason why i get a differnt result is that rust reads the content as ascii, like this:
buffer: [48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55]
buffer: [56, 56, 57, 57, 97, 97, 98, 98, 99, 99, 100, 100, 101, 101, 102, 102]
Is there a way to read the content directly to an hex array or how would one convert this?

Answer 1

You can use hex::decode to convert hex into bytes and then use '^' symbol to do xor operation with bits to get your result.

Answer 2

This does the job, reads 16 byte blocks until the end of the file, converts it to &str and converts it again into a vector of Chars:
let mut buffer = [0;16];
while let Ok(n) = file.read(&mut buffer) {
if n == 0 {
break;
}
let s = match str::from_utf8(&buffer) {
Ok(str) => str,
Err(e) => panic!("Invalid UTF-8 sequence: {}", e),
};
let mut content = s.to_string();
let char_vec: Vec<char> = content.chars().collect();
println!("Chars{:?}", char_vec);
}