create_image/
create_image.rs

1//! Creates a small disk-backed encrypted filesystem image, writes some sample
2//! data into it, and prints the absolute path so you can inspect it in a hex
3//! editor.
4//!
5//! Run with:
6//!   cargo run --example create_image
7
8use std::sync::Arc;
9
10use doublecrypt_core::block_store::DiskBlockStore;
11use doublecrypt_core::crypto::ChaChaEngine;
12use doublecrypt_core::fs::FilesystemCore;
13use doublecrypt_core::model::DEFAULT_BLOCK_SIZE;
14
15fn main() {
16    let path = std::env::current_dir()
17        .unwrap()
18        .join("sample.dcfs")
19        .to_string_lossy()
20        .to_string();
21
22    // Remove leftover from a previous run, if any.
23    let _ = std::fs::remove_file(&path);
24
25    // 64 blocks × 64 KiB = 4 MiB image.
26    let total_blocks: u64 = 64;
27    let store = Arc::new(
28        DiskBlockStore::create(&path, DEFAULT_BLOCK_SIZE, total_blocks)
29            .expect("failed to create image file"),
30    );
31
32    let crypto = Arc::new(ChaChaEngine::generate().expect("failed to init crypto"));
33    let mut fs = FilesystemCore::new(store, crypto);
34
35    fs.init_filesystem().expect("init_filesystem failed");
36
37    // Create a text file.
38    fs.create_file("hello.txt").expect("create_file failed");
39    fs.write_file("hello.txt", 0, b"Hello, hex editor!")
40        .expect("write_file failed");
41
42    // Create a directory.
43    fs.create_directory("notes")
44        .expect("create_directory failed");
45
46    // Create a larger binary file so there's more to look at.
47    let pattern: Vec<u8> = (0..=255).cycle().take(200_000).collect();
48    fs.create_file("pattern.bin").expect("create_file failed");
49    fs.write_file("pattern.bin", 0, &pattern)
50        .expect("write_file failed");
51
52    fs.sync().expect("sync failed");
53
54    println!("Filesystem image written to:\n  {path}");
55    println!(
56        "  {} blocks × {} bytes = {} bytes total",
57        total_blocks,
58        DEFAULT_BLOCK_SIZE,
59        total_blocks as usize * DEFAULT_BLOCK_SIZE
60    );
61}
create_image/create_image.rs

create_image/
create_image.rs
