Add log fuzzer to gix-ref

Author: nathaniel-brough

gix-ref/fuzz/Cargo.toml

@@ -28,3 +28,9 @@ name = "fuzz_names"
 path = "fuzz_targets/fuzz_names.rs"
 test = false
 doc = false
+
+[[bin]]
+name = "fuzz_log"
+path = "fuzz_targets/fuzz_log.rs"
+test = false
+doc = false

gix-ref/fuzz/fuzz_targets/fuzz_log.rs

@@ -0,0 +1,17 @@
+#![no_main]
+
+use anyhow::Result;
+use gix_ref::file::log;
+use libfuzzer_sys::fuzz_target;
+use std::hint::black_box;
+
+fn fuzz(line: &[u8]) -> Result<()> {
+    let line = log::LineRef::from_bytes(line)?;
+    _ = black_box(line.previous_oid());
+    _ = black_box(line.new_oid());
+    Ok(())
+}
+
+fuzz_target!(|ctx: &[u8]| {
+    _ = black_box(fuzz(ctx));
+});