# Pastebin Mus9JqBn
use std::fs;
use std::io::{BufReader, Read};
use std::path::Path;

const BUFFER_SIZE: usize = 1024;

fn main() {
    let dir1 = Path::new("/path/to/dir1");
    let dir2 = Path::new("/path/to/dir2");

    compare_directories(dir1, dir2);
}

fn compare_directories(dir1: &Path, dir2: &Path) {
    for entry in fs::read_dir(dir1).unwrap() {
        let entry = entry.unwrap();
        let path1 = entry.path();

        if entry.file_type().unwrap().is_dir() {
            let path2 = dir2.join(entry.file_name());
            if !fs::metadata(&path2).is_ok() {
                println!("Directory not found: {}", path2.display());
                continue;
            }
            compare_directories(&path1, &path2);
        } else {
            let path2 = dir2.join(entry.file_name());
            if !fs::metadata(&path2).is_ok() {
                println!("File not found: {}", path2.display());
                continue;
            }

            let mut buffer1 = Vec::new();
            let mut buffer2 = Vec::new();

            let mut file1 = BufReader::new(fs::File::open(&path1).unwrap());
            let mut file2 = BufReader::new(fs::File::open(&path2).unwrap());

            loop {
                let bytes_read1 = file1.read(&mut buffer1[..BUFFER_SIZE]).unwrap();
                let bytes_read2 = file2.read(&mut buffer2[..BUFFER_SIZE]).unwrap();

                if bytes_read1 != bytes_read2 || buffer1 != buffer2 {
                    println!("Files differ: {} and {}", path1.display(), path2.display());
                    break;
                }

                if bytes_read1 == 0 || bytes_read2 == 0 {
                    break;
                }
            }
        }
    }
}