feat(gzip): switch to zlib-rs for default gz backend

CHANGELOG.md

@@ -2,6 +2,30 @@
 
 All notable changes to this project will be documented in this file.
 
+## v0.19.1 -- 2025-10-15
+
+### Changed
+- Gzip backend selection via feature flags:
+  - Default feature `gz` switched to use flate2 with the `gz-zlib-rs` backend for improved performance.
+  - New selectors and aliases:
+    - `gz-zlib-rs` — enables `flate2/zlib-rs` (Rust, fast)
+    - `gz-miniz` — enables `flate2/miniz_oxide` (pure Rust, most portable)
+  - Disabled `flate2` default-features to allow explicit backend choice.
+
+### Added
+- Criterion benchmark `benches/gzip_decompress.rs` to measure gzip decompression throughput across backends.
+
+### Usage
+- Default (zlib-rs):
+  - cargo build
+  - cargo bench --bench gzip_decompress --features gz
+- zlib-rs:
+  - cargo build --no-default-features --features gz-zlib-rs
+  - cargo bench --bench gzip_decompress --no-default-features --features gz-zlib-rs
+- miniz_oxide (explicit):
+  - cargo build --no-default-features --features gz-miniz
+  - cargo bench --bench gzip_decompress --no-default-features --features gz-miniz
+
 ## v0.19.0 -- 2025-08-31
 
 ### Breaking Changes
@@ -14,7 +38,7 @@ All notable changes to this project will be documented in this file.
 
 **Migration guide:**
 
-```toml
+```
 # Before (v0.18.x)
 oneio = { version = "0.18", features = ["lib-core", "rustls"] }
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "oneio"
-version = "0.19.0"
+version = "0.19.1"
 authors = ["Mingwei Zhang <mingwei@bgpkit.com>"]
 edition = "2021"
 readme = "README.md"
@@ -30,7 +30,8 @@ reqwest = { version = "0.12", default-features = false, features = ["blocking",
 suppaftp = { version = "7.0", optional = true }
 
 # feature: compressions
-flate2 = { version = "1", optional = true }
+# Turn off flate2 default-features so we can explicitly choose backend via features
+flate2 = { version = "1", optional = true, default-features = false }
 bzip2 = { version = "0.6.0", optional = true }
 lz4 = { version = "1.24", optional = true }
 xz2 = { version = "0.1", optional = true }
@@ -45,7 +46,7 @@ serde = { version = "1.0", optional = true }
 serde_json = { version = "1.0", optional = true }
 
 # feature: s3
-rust-s3 = { version = "0.35", optional = true, default-features = false, features = [
+rust-s3 = { version = "0.37", optional = true, default-features = false, features = [
     "sync",
 ] }
 
@@ -75,8 +76,14 @@ https = ["http", "rustls"] # https needs http
 ftp = ["https", "suppaftp"] # ftp needs https
 s3 = ["rust-s3"]
 
-# Compression features (independent)
-gz = ["flate2"]
+gz = ["gz-zlib-rs"]
+# internal feature to enable gzip support
+any_gz = []
+# fastest Rust impl with some unsafe code
+gz-zlib-rs = ["any_gz", "flate2/zlib-rs"]
+# slower pure safe Rust impl
+gz-miniz = ["any_gz", "flate2/miniz_oxide", "flate2/any_impl"]
+
 bz = ["bzip2"]
 lz = ["lz4"]
 xz = ["xz2"]
@@ -111,6 +118,13 @@ tracing-subscriber = "0.3"
 tar = "0.4"
 tokio = { version = "1.0", features = ["macros", "rt"] }
 indicatif = "0.18"
+criterion = { version = "0.5", default-features = false }
+
+# Benchmarks
+[[bench]]
+name = "gzip_decompress"
+harness = false
+required-features = ["any_gz"]
 
 # This list only includes examples which require additional features to run. These are more in the examples' directory.
 [[example]]

benches/gzip_decompress.rs

@@ -0,0 +1,46 @@
+use std::fs::File;
+use std::hint::black_box;
+use std::io::Read;
+
+use criterion::{criterion_group, criterion_main, BatchSize, Criterion, Throughput};
+use flate2::read::GzDecoder;
+
+// Benchmark gzip decompression using flate2 with the selected backend.
+// To run with default (miniz_oxide) backend:
+//   cargo bench --bench gzip_decompress --no-default-features --features gz-miniz
+// To run with zlib-rs backend:
+//   cargo bench --bench gzip_decompress --no-default-features --features gz-zlib-rs
+// To compare, run both commands and compare Criterion reports.
+
+fn load_gz_bytes() -> Vec<u8> {
+    let mut f = File::open("tests/test_data.txt.gz").expect("missing tests/test_data.txt.gz");
+    let mut buf = Vec::new();
+    f.read_to_end(&mut buf).unwrap();
+    buf
+}
+
+fn bench_gzip_decompress(c: &mut Criterion) {
+    let input = load_gz_bytes();
+
+    let mut group = c.benchmark_group("gzip_decompress");
+    group.throughput(Throughput::Bytes(input.len() as u64));
+
+    group.bench_function("flate2_gz_decode", |b| {
+        b.iter_batched(
+            || input.clone(),
+            |bytes| {
+                let reader = GzDecoder::new(bytes.as_slice());
+                let mut out = Vec::with_capacity(128 * 1024);
+                let mut r = reader;
+                r.read_to_end(&mut out).unwrap();
+                black_box(out)
+            },
+            BatchSize::SmallInput,
+        )
+    });
+
+    group.finish();
+}
+
+criterion_group!(benches, bench_gzip_decompress);
+criterion_main!(benches);

src/oneio/compressions/mod.rs

@@ -11,7 +11,7 @@ use std::io::{BufWriter, Read, Write};
 
 #[cfg(feature = "bz")]
 pub(crate) mod bzip2;
-#[cfg(feature = "gz")]
+#[cfg(feature = "any_gz")]
 pub(crate) mod gzip;
 #[cfg(feature = "lz")]
 pub(crate) mod lz4;
@@ -50,7 +50,7 @@ pub(crate) fn get_compression_reader(
     file_suffix: &str,
 ) -> Result<Box<dyn Read + Send>, OneIoError> {
     match file_suffix {
-        #[cfg(feature = "gz")]
+        #[cfg(feature = "any_gz")]
         "gz" | "gzip" | "tgz" => gzip::get_reader(raw_reader),
         #[cfg(feature = "bz")]
         "bz2" | "bz" => bzip2::get_reader(raw_reader),
@@ -97,7 +97,7 @@ pub(crate) fn get_compression_writer(
     file_suffix: &str,
 ) -> Result<Box<dyn Write>, OneIoError> {
     match file_suffix {
-        #[cfg(feature = "gz")]
+        #[cfg(feature = "any_gz")]
         "gz" | "gzip" | "tgz" => gzip::get_writer(raw_writer),
         #[cfg(feature = "bz")]
         "bz2" | "bz" => bzip2::get_writer(raw_writer),

src/oneio/mod.rs

@@ -552,7 +552,7 @@ fn get_async_compression_reader(
     file_type: &str,
 ) -> Result<Box<dyn AsyncRead + Send + Unpin>, OneIoError> {
     match file_type {
-        #[cfg(all(feature = "async", feature = "gz"))]
+        #[cfg(all(feature = "async", feature = "any_gz"))]
         "gz" | "gzip" => {
             use async_compression::tokio::bufread::GzipDecoder;
             use tokio::io::BufReader;
@@ -608,7 +608,7 @@ mod tests {
 
     const TEST_TEXT: &str = "OneIO test file.\nThis is a test.";
 
-    #[cfg(feature = "gz")]
+    #[cfg(feature = "any_gz")]
     #[test]
     fn test_progress_tracking_local() {
         use std::sync::{Arc, Mutex};
@@ -751,7 +751,7 @@ mod tests {
         }
 
         // Test with compression formats that support async
-        #[cfg(feature = "gz")]
+        #[cfg(feature = "any_gz")]
         {
             match get_reader_async("tests/test_data.txt.gz").await {
                 Ok(mut reader) => {

tests/async_integration.rs

@@ -18,7 +18,7 @@ async fn async_read_local_plain() {
     assert_eq!(content, TEST_TEXT);
 }
 
-#[cfg(feature = "gz")]
+#[cfg(feature = "any_gz")]
 #[tokio::test]
 async fn async_read_local_gzip() {
     let mut reader = oneio::get_reader_async("tests/test_data.txt.gz")
@@ -46,7 +46,7 @@ async fn async_read_http_plain() {
     }
 }
 
-#[cfg(all(feature = "http", feature = "gz"))]
+#[cfg(all(feature = "http", feature = "any_gz"))]
 #[tokio::test]
 async fn async_read_http_gzip() {
     match oneio::get_reader_async("https://spaces.bgpkit.org/oneio/test_data.txt.gz").await {

tests/basic_integration.rs

@@ -53,7 +53,7 @@ fn test_local_files() {
     test_read("tests/test_data.txt");
 
     // Test gzip (default feature)
-    #[cfg(feature = "gz")]
+    #[cfg(feature = "any_gz")]
     test_read("tests/test_data.txt.gz");
 
     // Test bzip2 (default feature)
@@ -66,7 +66,7 @@ fn test_writers() {
     // Test writing with default compression formats
     test_write("tests/test_write_data.txt", "tests/test_data.txt");
 
-    #[cfg(feature = "gz")]
+    #[cfg(feature = "any_gz")]
     test_write("tests/test_write_data.txt.gz", "tests/test_data.txt.gz");
 
     #[cfg(feature = "bz")]
@@ -79,7 +79,7 @@ fn test_remote_files() {
     // Test HTTP reading (default feature)
     test_read("https://spaces.bgpkit.org/oneio/test_data.txt");
 
-    #[cfg(feature = "gz")]
+    #[cfg(feature = "any_gz")]
     test_read("https://spaces.bgpkit.org/oneio/test_data.txt.gz");
 
     #[cfg(feature = "bz")]