Add a simple fuzz tester, from Linux & nightly - cargo fuzz run fuzz_…

…target_1

types/fuzz/.gitignore

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+target
+corpus
+artifacts

types/fuzz/Cargo.toml

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+[package]
+name = "opcua-types-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.opcua-types]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false

types/fuzz/fuzz_targets/fuzz_target_1.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use opcua_types::*;
+use std::io::Cursor;
+
+pub fn deserialize(data: &[u8], decoding_options: &DecodingOptions) -> Result<Variant, StatusCode> {
+    // Decode this, don't expect panics or whatever
+    let mut stream = Cursor::new(data);
+    Variant::decode(&mut stream, &decoding_options)
+}
+
+fuzz_target!(|data: &[u8]| {
+    let decoding_options = DecodingOptions::default();
+    let _ = deserialize(data, &decoding_options);
+});