44 lines
1.5 KiB
Rust
44 lines
1.5 KiB
Rust
use tiff::decoder::Decoder;
|
|
|
|
// This file has the following IFD structure:
|
|
//
|
|
// ```
|
|
// IFD -> IFD -> IFD
|
|
// |-> IFD
|
|
// |-> IFD -> IFD
|
|
// | \-> IFD -> IFD
|
|
// \-> IFD
|
|
// ```
|
|
//
|
|
// where the main chain of IFD has 3 images, the second of which has several sub-IFDs and some have
|
|
// more nested IFDs.
|
|
const TEST_IMAGE_SUBIFD: &str = "./tests/subsubifds.tif";
|
|
use std::fs::File;
|
|
|
|
#[test]
|
|
fn decode_seek_chain() {
|
|
let file = File::open(TEST_IMAGE_SUBIFD).expect("Cannot open test image");
|
|
let mut decoder = Decoder::open(file).expect("Invalid format to create decoder");
|
|
assert!(decoder.ifd_pointer().is_none());
|
|
|
|
decoder.next_image().unwrap();
|
|
// Remember the offsets in the first iteration.
|
|
let offset0 = decoder.ifd_pointer().expect("First IFD pointer not found");
|
|
decoder.next_image().unwrap();
|
|
let offset1 = decoder.ifd_pointer().expect("Second IFD pointer not found");
|
|
decoder.next_image().unwrap();
|
|
let offset2 = decoder.ifd_pointer().expect("Third IFD pointer not found");
|
|
assert!(!decoder.more_images());
|
|
|
|
// Ensure we can seek, to do this again.
|
|
decoder
|
|
.seek_to_image(0)
|
|
.expect("Failed to seek to first image");
|
|
assert_eq!(Some(offset0), decoder.ifd_pointer());
|
|
decoder.next_image().unwrap();
|
|
assert_eq!(Some(offset1), decoder.ifd_pointer());
|
|
decoder.next_image().unwrap();
|
|
assert_eq!(Some(offset2), decoder.ifd_pointer());
|
|
assert!(!decoder.more_images());
|
|
}
|