From 7a7bf564e07b88935d32a34977acba8832ecc66a Mon Sep 17 00:00:00 2001
From: Wei Ji <23487320+weiji14@users.noreply.github.com>
Date: Wed, 21 May 2025 16:27:25 +1200
Subject: [PATCH 1/2] Add utility function to read TIFF files from remote
 object stores

Also enable http feature for object_store
---
 Cargo.toml        |  2 +-
 tests/util/mod.rs | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 tests/util/mod.rs

diff --git a/Cargo.toml b/Cargo.toml
index 46707d2..3c58d05 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ tokio = { version = "1.43.0", optional = true, default-features = false, feature
 weezl = "0.1.0"
 
 [dev-dependencies]
-object_store = "0.12"
+object_store = { version = "0.12", features = ["http"] }
 tiff = "0.9.1"
 tokio = { version = "1.9", features = [
     "macros",
diff --git a/tests/util/mod.rs b/tests/util/mod.rs
new file mode 100644
index 0000000..8b3fa07
--- /dev/null
+++ b/tests/util/mod.rs
@@ -0,0 +1,24 @@
+use std::sync::Arc;
+
+use async_tiff::metadata::{PrefetchBuffer, TiffMetadataReader};
+use async_tiff::reader::{AsyncFileReader, ObjectReader};
+use async_tiff::TIFF;
+use reqwest::Url;
+
+pub(crate) async fn open_remote_tiff(url: &str) -> TIFF {
+    let parsed_url = Url::parse(url).expect("failed parsing url");
+    let (store, path) = object_store::parse_url(&parsed_url).unwrap();
+
+    let reader = Arc::new(ObjectReader::new(Arc::new(store), path)) as Arc<dyn AsyncFileReader>;
+    let prefetch_reader = PrefetchBuffer::new(reader.clone(), 32 * 1024)
+        .await
+        .unwrap();
+    let mut metadata_reader = TiffMetadataReader::try_open(&prefetch_reader)
+        .await
+        .unwrap();
+    let ifds = metadata_reader
+        .read_all_ifds(&prefetch_reader)
+        .await
+        .unwrap();
+    TIFF::new(ifds)
+}

From a402f44671d01050164656af1b940a5a057dff88 Mon Sep 17 00:00:00 2001
From: Wei Ji <23487320+weiji14@users.noreply.github.com>
Date: Wed, 21 May 2025 16:25:23 +1200
Subject: [PATCH 2/2] Add test for opening single-channel OME-TIFF file

---
 tests/ome_tiff.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 tests/ome_tiff.rs

diff --git a/tests/ome_tiff.rs b/tests/ome_tiff.rs
new file mode 100644
index 0000000..4e332ab
--- /dev/null
+++ b/tests/ome_tiff.rs
@@ -0,0 +1,21 @@
+/// Integration tests on OME-TIFF files.
+use async_tiff::tiff::tags::PhotometricInterpretation;
+
+mod util;
+
+#[tokio::test]
+async fn test_ome_tiff_single_channel() {
+    let tiff =
+        util::open_remote_tiff("https://downloads.openmicroscopy.org/images/OME-TIFF/2016-06/bioformats-artificial/single-channel.ome.tif").await;
+
+    assert_eq!(tiff.ifds().len(), 1);
+    let ifd = &tiff.ifds()[0];
+
+    assert_eq!(
+        ifd.photometric_interpretation(),
+        PhotometricInterpretation::BlackIsZero
+    );
+    assert_eq!(ifd.image_description(), Some("<?xml version=\"1.0\" encoding=\"UTF-8\"?><!-- Warning: this comment is an OME-XML metadata block, which contains crucial dimensional parameters and other important metadata. Please edit cautiously (if at all), and back up the original data before doing so. For more information, see the OME-TIFF web site: http://www.openmicroscopy.org/site/support/ome-model/ome-tiff/. --><OME xmlns=\"http://www.openmicroscopy.org/Schemas/OME/2016-06\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" Creator=\"OME Bio-Formats 5.2.2\" UUID=\"urn:uuid:2bc2aa39-30d2-44ee-8399-c513492dd5de\" xsi:schemaLocation=\"http://www.openmicroscopy.org/Schemas/OME/2016-06 http://www.openmicroscopy.org/Schemas/OME/2016-06/ome.xsd\"><Image ID=\"Image:0\" Name=\"single-channel.ome.tif\"><Pixels BigEndian=\"true\" DimensionOrder=\"XYZCT\" ID=\"Pixels:0\" SizeC=\"1\" SizeT=\"1\" SizeX=\"439\" SizeY=\"167\" SizeZ=\"1\" Type=\"int8\"><Channel ID=\"Channel:0:0\" SamplesPerPixel=\"1\"><LightPath/></Channel><TiffData FirstC=\"0\" FirstT=\"0\" FirstZ=\"0\" IFD=\"0\" PlaneCount=\"1\"><UUID FileName=\"single-channel.ome.tif\">urn:uuid:2bc2aa39-30d2-44ee-8399-c513492dd5de</UUID></TiffData></Pixels></Image></OME>"));
+
+    assert!(ifd.bits_per_sample().iter().all(|x| *x == 8));
+}