feat: Fuzz more of the gix-config api

Author: nathaniel-brough

gix-config/fuzz/Cargo.toml

@@ -10,7 +10,8 @@ edition = "2021"
 cargo-fuzz = true
 
 [dependencies]
-libfuzzer-sys = "0.3"
+libfuzzer-sys = "0.4.7"
+arbitrary = { version = "1", features = ["derive"] }
 
 [dependencies.gix-config]
 path = ".."

gix-config/fuzz/fuzz_targets/parse.rs

@@ -1,8 +1,19 @@
 #![no_main]
 
+use arbitrary::Arbitrary;
+use gix_config::{parse::Events, File};
 use libfuzzer_sys::fuzz_target;
+use std::hint::black_box;
 
-fuzz_target!(|data: &[u8]| {
-    // Don't name this _; Rust may optimize it out.
-    let _a = gix_config::parse::from_bytes(data, &mut |_e| ());
+#[derive(Debug, Arbitrary, Clone)]
+struct Ctx<'a> {
+    parse_from_bytes: &'a [u8],
+    parse_file: &'a str,
+    parse_events: &'a str,
+}
+
+fuzz_target!(|ctx: Ctx| {
+    _ = black_box(gix_config::parse::from_bytes(ctx.parse_from_bytes, &mut |_e| ()));
+    _ = black_box(File::try_from(ctx.parse_file));
+    _ = black_box(Events::try_from(ctx.parse_events));
 });