Add fuzzers for parsers.

fuzz/.gitignore

@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "cookie-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.cookie]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[profile.release]
+debug = 1
+
+[[bin]]
+name = "parser"
+path = "fuzz_targets/parser.rs"
+test = false
+doc = false
+
+[[bin]]
+name = "split"
+path = "fuzz_targets/split.rs"
+test = false
+doc = false

fuzz/fuzz_targets/parser.rs

@@ -0,0 +1,9 @@
+#![no_main]
+
+extern crate cookie;
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &str| {
+    let _ = cookie::Cookie::parse(data);
+});

fuzz/fuzz_targets/split.rs

@@ -0,0 +1,10 @@
+#![no_main]
+
+extern crate cookie;
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &str| {
+    // Use `count()` to exhaust the iterator.
+    let _ = cookie::Cookie::split_parse(data).count();
+});