How can i parse an itm.txt file? - rust

Question

I am new to embedded and Rust programming. I am working on sensor and I am able to get the readings of the sensor.
The problem:
The data is in the itm.txt file which includes headers and a variable-length payload, Data in itm.txt file. When I am getting the readings of the sensor I am getting this.
Can someone please help me to parse this data, I am finding no way in Rust to parse this data.
This is the code I am using to get the file content.
use std::io;
use std::fs::File;
use std::io::{Read, BufReader};
fn decode<R: io::Read>(mut r: R) -> io::Result<Vec<u8>> {
let mut output = vec![];
loop {
let mut len = 0u8;
r.read_exact(std::slice::from_mut(&mut len))?;
let len = 1 << (len - 1);
let mut buf = vec![0; len];
let res = r.read_exact(&mut buf);
if buf == b"\0" {
break;
}
output.extend(buf);
}
Ok(output)
}
fn main() {
//let data = "{ x: 579, y: -197 , z: -485 }\0";
let mut file = File::open("/tmp/itm.txt").expect("No such file is present at this location");
let mut buf_reader = Vec::new();
file.read_to_end(&mut buf_reader).expect("error");
let content = std::str::from_utf8(&buf_reader).unwrap();
println!("raw str: {:?}", content);
println!("raw hex: {:x?}", content.as_bytes());
let decoded = decode(content.as_bytes()).unwrap();
let s = std::str::from_utf8(&decoded).expect("Failed");
println!("decoded str: {:?}", s);
}
The error I am getting now
raw str: "\u{2}Un\u{3}scal\u{3}edMe\u{3}asur\u{3}emen\u{1}t\u{1} \u{2}{ \u{1}x\u{2}: \u{2}31\u{1}3\u{1},\u{1} \n\n"
raw hex: [2, 55, 6e, 3, 73, 63, 61, 6c, 3, 65, 64, 4d, 65, 3, 61, 73, 75, 72, 3, 65, 6d, 65, 6e, 1, 74, 1, 20, 2, 7b, 20, 1, 78, 2, 3a, 20, 2, 33, 31, 1, 33, 1, 2c, 1, 20, a, a]
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error { kind: UnexpectedEof, message: "failed to fill whole buffer" }', src/main.rs:51:46
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
This is the link to itm thing.