From 827122e165922c4010096c8d9ad32913ae06ab9e Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Mon, 4 Sep 2023 22:40:18 -0400
Subject: benchmark

---
 Cargo.toml        |   7 +++++--
 benches/bench.rs  |  58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 benches/large.png | Bin 0 -> 7655145 bytes
 benches/small.png | Bin 0 -> 233 bytes
 pre-commit        |   2 +-
 src/lib.rs        |   2 +-
 test-all.sh       |   8 ++++----
 7 files changed, 69 insertions(+), 8 deletions(-)
 create mode 100644 benches/bench.rs
 create mode 100644 benches/large.png
 create mode 100644 benches/small.png

diff --git a/Cargo.toml b/Cargo.toml
index 37e7c99..fe73293 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,12 +3,15 @@ name = "tiny-png"
 version = "0.1.0"
 edition = "2021"
 
-[dependencies]
-
 [dev-dependencies]
+criterion = { version = "0.5.1", features = ["html_reports"] }
 png = "0.17.10"
 
 [features]
 default = ["std"]
 std = []
 adler = []
+
+[[bench]]
+name = "bench"
+harness = false
diff --git a/benches/bench.rs b/benches/bench.rs
new file mode 100644
index 0000000..a8c13ba
--- /dev/null
+++ b/benches/bench.rs
@@ -0,0 +1,58 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use std::hint::black_box;
+
+fn run_benches(c: &mut Criterion) {
+	let large_image = black_box(std::fs::read("benches/large.png").unwrap());
+	let small_image = black_box(std::fs::read("benches/small.png").unwrap());
+
+	let mut group = c.benchmark_group("large-image");
+	group.sample_size(50);
+
+	group.bench_function("tiny-png", |b| {
+		b.iter(|| {
+			let mut png = &large_image[..];
+			let header = tiny_png::read_png_header(&mut png).unwrap();
+			let mut buf = vec![0; header.required_bytes()];
+			let data = tiny_png::read_png(&mut png, Some(&header), &mut buf).unwrap();
+			std::hint::black_box(data);
+		})
+	});
+
+	group.bench_function("png", |b| {
+		b.iter(|| {
+			let png = &large_image[..];
+			let decoder = png::Decoder::new(png);
+			let mut reader = decoder.read_info().unwrap();
+			let mut png_buf = vec![0; reader.output_buffer_size()];
+			reader.next_frame(&mut png_buf).unwrap();
+			std::hint::black_box(png_buf);
+		})
+	});
+	group.finish();
+
+	let mut group = c.benchmark_group("small-image");
+	group.sample_size(1000);
+	group.bench_function("tiny-png", |b| {
+		b.iter(|| {
+			let mut png = &small_image[..];
+			let header = tiny_png::read_png_header(&mut png).unwrap();
+			let mut buf = vec![0; header.required_bytes()];
+			let data = tiny_png::read_png(&mut png, Some(&header), &mut buf).unwrap();
+			std::hint::black_box(data);
+		})
+	});
+	group.bench_function("png", |b| {
+		b.iter(|| {
+			let png = &small_image[..];
+			let decoder = png::Decoder::new(png);
+			let mut reader = decoder.read_info().unwrap();
+			let mut png_buf = vec![0; reader.output_buffer_size()];
+			reader.next_frame(&mut png_buf).unwrap();
+			std::hint::black_box(png_buf);
+		})
+	});
+	group.finish();
+}
+
+criterion_group!(benches, run_benches);
+criterion_main!(benches);
diff --git a/benches/large.png b/benches/large.png
new file mode 100644
index 0000000..f0344e5
Binary files /dev/null and b/benches/large.png differ
diff --git a/benches/small.png b/benches/small.png
new file mode 100644
index 0000000..47226a2
Binary files /dev/null and b/benches/small.png differ
diff --git a/pre-commit b/pre-commit
index 5055d4b..d086491 100755
--- a/pre-commit
+++ b/pre-commit
@@ -3,4 +3,4 @@
 cd $(git rev-parse --show-toplevel)
 cargo fmt || exit 1
 cargo clippy -- -D warnings || exit 1
-git add -u src
+git add -u src benches test examples
diff --git a/src/lib.rs b/src/lib.rs
index 750a1f3..fa3bab9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -506,7 +506,7 @@ impl<'a> DecompressedDataWriter<'a> {
 
 const HUFFMAN_MAX_CODES: usize = 286;
 const HUFFMAN_MAX_BITS: u8 = 15;
-const HUFFMAN_MAIN_TABLE_BITS: u8 = 11;
+const HUFFMAN_MAIN_TABLE_BITS: u8 = 10;
 const HUFFMAN_MAIN_TABLE_SIZE: usize = 1 << HUFFMAN_MAIN_TABLE_BITS;
 const HUFFMAN_SUBTABLE_SIZE: usize = 1 << (HUFFMAN_MAX_BITS - HUFFMAN_MAIN_TABLE_BITS);
 #[derive(Debug)]
diff --git a/test-all.sh b/test-all.sh
index c15341a..cb7f19a 100755
--- a/test-all.sh
+++ b/test-all.sh
@@ -2,8 +2,8 @@
 
 # test all feature sets
 for mode in '' '--release'; do
-	cargo t $mode
-	cargo t $mode --no-default-features
-	cargo t $mode --features adler
-	cargo t $mode --no-default-features --features adler
+	cargo t $mode || exit 1
+	cargo t $mode --no-default-features || exit 1
+	cargo t $mode --features adler || exit 1
+	cargo t $mode --no-default-features --features adler || exit 1
 done
-- 
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