feat: add rudimentary fuzzer for specctra-core DSN parser

Fixes #110

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = [".", "crates/*"]
+members = [".", "crates/*", "crates/*/fuzz"]
 resolver = "2"
 
 [workspace.dependencies]

crates/specctra-core/fuzz/.gitignore

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

crates/specctra-core/fuzz/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "specctra-core-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.specctra-core]
+path = ".."
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false
+bench = false

crates/specctra-core/fuzz/fuzz_targets/fuzz_target_1.rs

@@ -0,0 +1,13 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &str| {
+    let mut cursor = std::io::Cursor::new(data);
+
+    use specctra_core::{read::ListTokenizer, structure::DsnFile};
+
+    let mut tkz = ListTokenizer::new(cursor);
+
+    let _: Result<_, _> = tkz.read_value::<DsnFile>();
+});