mp4box 0.8.0

Minimal MP4/ISOBMFF parser with JSON output, box decoding, and UUID support
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

use mp4box::hex_range;
use std::fs::File;
use std::io::Write;
use std::path::PathBuf;

fn temp_file(bytes: &[u8], name: &str) -> PathBuf {
    let path = std::env::temp_dir().join(name);
    let mut f = File::create(&path).expect("create temp file failed");
    f.write_all(bytes).expect("write temp data failed");
    path
}

#[test]
fn hex_range_reads_within_bounds() {
    let data: Vec<u8> = (0u8..64u8).collect();
    let path = temp_file(&data, "mp4box_hex_range_reads.bin");

    let mut file = File::open(&path).expect("open temp file failed");
    let file_size = file.metadata().expect("metadata failed").len();

    // Read 16 bytes starting at offset 16
    let dump = hex_range(&mut file, file_size, 16, 16).expect("hex_range failed");

    assert_eq!(dump.offset, 16);
    assert_eq!(dump.length, 16);
    assert!(!dump.hex.is_empty());
}

#[test]
fn hex_range_clamps_to_eof() {
    let data: Vec<u8> = (0u8..32u8).collect();
    let path = temp_file(&data, "mp4box_hex_range_clamp.bin");

    let mut file = File::open(&path).expect("open temp file failed");
    let file_size = file.metadata().expect("metadata failed").len();

    // Ask for 32 bytes from offset 24; only 8 are available.
    let dump = hex_range(&mut file, file_size, 24, 32).expect("hex_range failed");

    assert_eq!(dump.offset, 24);
    assert_eq!(dump.length, 8);
    assert!(!dump.hex.is_empty());
}