fix(bench): add some basic criterion benchmarks

criterion dep is disabled by default since there is no way to add separate deps for tests and benchmarks

Author: oyvindln

miniz_oxide/Cargo.toml

@@ -26,6 +26,15 @@ core = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-core
 alloc = { version = '1.0.0', optional = true, package = 'rustc-std-workspace-alloc' }
 compiler_builtins = { version = '0.1.2', optional = true }
 
+[dev-dependencies]
+## Messes with minimum rust version and drags in deps just for running tests
+## so just comment out for now and enable manually when needed for enabling benches
+# criterion = "0.5"
+
+[[bench]]
+name = "benchmark"
+harness = false
+
 [features]
 default = ["with-alloc"]
 with-alloc = []

miniz_oxide/benches/benchmark.rs

@@ -0,0 +1,40 @@
+extern crate criterion;
+
+use std::hint::black_box;
+use std::io::Read;
+
+use criterion::{criterion_group, criterion_main, Criterion, Throughput};
+use miniz_oxide::deflate::{compress_to_vec, compress_to_vec_zlib};
+use miniz_oxide::inflate::{decompress_to_vec, decompress_to_vec_zlib, TINFLStatus};
+
+fn get_test_file_data(name: &str) -> Vec<u8> {
+    use std::fs::File;
+    let mut input = Vec::new();
+    let mut f = File::open(name).unwrap();
+
+    f.read_to_end(&mut input).unwrap();
+    input
+}
+
+fn get_test_data() -> Vec<u8> {
+    use std::env;
+    let path = env::var("TEST_FILE").unwrap_or_else(|_| "../miniz/miniz.c".to_string());
+    get_test_file_data(&path)
+}
+
+fn bench_inflate(c: &mut Criterion) {
+    let data = get_test_data();
+    let compressed= compress_to_vec(&data, 6);
+    c.bench_function("inflate", |b| b.iter(|| decompress_to_vec(black_box(&compressed))));
+    let compressed_zlib = compress_to_vec_zlib(&data, 6);
+    c.bench_function("inflate_zlib", |b| b.iter(|| decompress_to_vec_zlib(black_box(&compressed_zlib))));
+}
+
+fn bench_deflate(c: &mut Criterion) {
+    let data = get_test_data();
+    c.bench_function("deflate_l6", |b| b.iter(|| compress_to_vec(black_box(&data), 6)));
+    c.bench_function("deflate_zlib_l6", |b| b.iter(|| compress_to_vec_zlib(black_box(&data), 6)));
+}
+
+criterion_group!(benches, bench_inflate, bench_deflate);
+criterion_main!(benches);