Fuzz more of pathspec patterns

- Fuzz more of the API
- Add associated dictionary

gix-pathspec/fuzz/Cargo.toml

@@ -9,6 +9,7 @@ edition = "2021"
 cargo-fuzz = true
 
 [dependencies]
+anyhow = "1.0.77"
 libfuzzer-sys = "0.4"
 
 [dependencies.gix-pathspec]

gix-pathspec/fuzz/fuzz_targets/parse.dict

@@ -0,0 +1,22 @@
+# ---- Magic signatures ----
+":(top)"
+"top"
+":/"
+
+":(icase)"
+"icase"
+
+":(literal)"
+"literal"
+
+":(glob)"
+"glob"
+
+# We can't close attr as they take arguments.
+":(attr:"
+":(attr:!"
+"attr"
+
+":(exclude)"
+"exclude"
+":!"

gix-pathspec/fuzz/fuzz_targets/parse.rs

@@ -1,6 +1,19 @@
 #![no_main]
+use anyhow::Result;
 use libfuzzer_sys::fuzz_target;
+use std::hint::black_box;
+
+fn fuzz(data: &[u8]) -> Result<()> {
+    let pattern = gix_pathspec::parse(data, Default::default())?;
+    _ = black_box(pattern.is_nil());
+    _ = black_box(pattern.prefix_directory());
+    _ = black_box(pattern.path());
+    // TODO: Fuzz normalize
+    _ = black_box(pattern.is_excluded());
+    _ = black_box(pattern.to_bstring());
+    Ok(())
+}
 
 fuzz_target!(|data: &[u8]| {
-    let _a = gix_pathspec::parse(data, Default::default());
+    _ = black_box(fuzz(data));
 });