1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/rust/zip/benches/read_entry.rs b/third_party/rust/zip/benches/read_entry.rs
new file mode 100644
index 0000000000..af9affe319
--- /dev/null
+++ b/third_party/rust/zip/benches/read_entry.rs
@@ -0,0 +1,43 @@
+use bencher::{benchmark_group, benchmark_main};
+
+use std::io::{Cursor, Read, Write};
+
+use bencher::Bencher;
+use getrandom::getrandom;
+use zip::{ZipArchive, ZipWriter};
+
+fn generate_random_archive(size: usize) -> Vec<u8> {
+    let data = Vec::new();
+    let mut writer = ZipWriter::new(Cursor::new(data));
+    let options =
+        zip::write::FileOptions::default().compression_method(zip::CompressionMethod::Stored);
+
+    writer.start_file("random.dat", options).unwrap();
+    let mut bytes = vec![0u8; size];
+    getrandom(&mut bytes).unwrap();
+    writer.write_all(&bytes).unwrap();
+
+    writer.finish().unwrap().into_inner()
+}
+
+fn read_entry(bench: &mut Bencher) {
+    let size = 1024 * 1024;
+    let bytes = generate_random_archive(size);
+    let mut archive = ZipArchive::new(Cursor::new(bytes.as_slice())).unwrap();
+
+    bench.iter(|| {
+        let mut file = archive.by_name("random.dat").unwrap();
+        let mut buf = [0u8; 1024];
+        loop {
+            let n = file.read(&mut buf).unwrap();
+            if n == 0 {
+                break;
+            }
+        }
+    });
+
+    bench.bytes = size as u64;
+}
+
+benchmark_group!(benches, read_entry);
+benchmark_main!(benches);