1 files changed, 41 insertions, 0 deletions
diff --git a/third_party/rust/zip/benches/read_metadata.rs b/third_party/rust/zip/benches/read_metadata.rs
new file mode 100644
index 0000000000..51f1f69e80
--- /dev/null
+++ b/third_party/rust/zip/benches/read_metadata.rs
@@ -0,0 +1,41 @@
+use bencher::{benchmark_group, benchmark_main};
+
+use std::io::{Cursor, Write};
+
+use bencher::Bencher;
+use zip::{ZipArchive, ZipWriter};
+
+const FILE_COUNT: usize = 15_000;
+const FILE_SIZE: usize = 1024;
+
+fn generate_random_archive(count_files: usize, file_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);
+
+    let bytes = vec![0u8; file_size];
+
+    for i in 0..count_files {
+        let name = format!(
+            "file_deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef_{}.dat",
+            i
+        );
+        writer.start_file(name, options).unwrap();
+        writer.write_all(&bytes).unwrap();
+    }
+
+    writer.finish().unwrap().into_inner()
+}
+
+fn read_metadata(bench: &mut Bencher) {
+    let bytes = generate_random_archive(FILE_COUNT, FILE_SIZE);
+
+    bench.iter(|| {
+        let archive = ZipArchive::new(Cursor::new(bytes.as_slice())).unwrap();
+        archive.len()
+    });
+}
+
+benchmark_group!(benches, read_metadata);
+benchmark_main!(benches);