Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/jpeg-decoder/benches/decoding_benchmark.rs

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+extern crate criterion;
+extern crate jpeg_decoder;
+
+use criterion::{black_box, Criterion};
+
+use jpeg_decoder as jpeg;
+use jpeg_decoder::ImageInfo;
+
+fn read_image(image: &[u8]) -> Vec<u8> {
+    jpeg::Decoder::new(black_box(image)).decode().unwrap()
+}
+
+fn read_metadata(image: &[u8]) -> ImageInfo {
+    let mut decoder = jpeg::Decoder::new(black_box(image));
+    decoder.read_info().unwrap();
+    decoder.info().unwrap()
+}
+
+fn main() {
+    let mut c = Criterion::default().configure_from_args();
+    c.bench_function("decode a 512x512 JPEG", |b| b.iter(|| {
+        read_image(include_bytes!("tower.jpg"))
+    }));
+
+    c.bench_function("decode a 512x512 progressive JPEG", |b| b.iter(|| {
+        read_image(include_bytes!("tower_progressive.jpg"))
+    }));
+
+    c.bench_function("decode a 512x512 grayscale JPEG", |b| b.iter(|| {
+        read_image(include_bytes!("tower_grayscale.jpg"))
+    }));
+
+    c.bench_function("extract metadata from an image", |b| b.iter(|| {
+        read_metadata(include_bytes!("tower.jpg"))
+    }));
+    
+    c.bench_function("decode a 3072x2048 RGB Lossless JPEG", |b| b.iter(|| {
+        read_image(include_bytes!("../tests/reftest/images/lossless/jpeg_lossless_sel1-rgb.jpg"))
+    }));
+    c.final_summary();
+}

vendor/jpeg-decoder/benches/large_image.rs

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+extern crate criterion;
+extern crate jpeg_decoder;
+
+use criterion::{black_box, Criterion};
+
+use jpeg_decoder as jpeg;
+
+fn read_image(image: &[u8]) -> Vec<u8> {
+    jpeg::Decoder::new(black_box(image)).decode().unwrap()
+}
+
+fn main() {
+    let mut c = Criterion::default().configure_from_args();
+    c.bench_function("decode a 2268x1512 JPEG", |b| {
+        b.iter(|| read_image(include_bytes!("large_image.jpg")))
+    });
+    c.final_summary();
+}