add fuzzer input generator

1 files changed, 25 insertions, 0 deletions

diff --git a/examples/generate_fuzz.rs b/examples/generate_fuzz.rs
new file mode 100644
index 0000000..92c983b
--- /dev/null
+++ b/examples/generate_fuzz.rs
@@ -0,0 +1,25 @@
+use std::io::BufRead as _;
+use std::io::Write as _;
+
+#[path = "../tests/helpers/mod.rs"]
+mod helpers;
+
+fn main() {
+    let name = std::env::args().nth(1).unwrap();
+    let _ = std::fs::remove_file(format!("fuzz/in/{}", name));
+
+    let inputs =
+        std::fs::File::open(format!("tests/data/fixtures/{}.in", name))
+            .unwrap();
+    let inputs = std::io::BufReader::new(inputs);
+
+    let mut bytes = vec![];
+    for line in inputs.lines() {
+        let line = line.unwrap();
+        let input = helpers::unhex(line.as_bytes());
+        bytes.extend(input.iter());
+    }
+    let mut input_file =
+        std::fs::File::create(format!("fuzz/in/{}", name)).unwrap();
+    input_file.write_all(&bytes).unwrap();
+}