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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::{
collections::hash_map::DefaultHasher,
fs::File,
hash::{Hash, Hasher},
io::Write,
path::Path,
};
/// Write a data item `data` for the fuzzing target `target` to the fuzzing corpus. The caller needs
/// to make sure that `target` is the correct fuzzing target name for the data written.
///
/// # Panics
///
/// Panics if the corpus directory does not exist or if the corpus item cannot be written.
pub fn write_item_to_fuzzing_corpus(target: &str, data: &[u8]) {
// This bakes in the assumption that we're executing in the root of the neqo workspace.
// Unfortunately, `cargo fuzz` doesn't provide a way to learn the location of the corpus
// directory.
let corpus = Path::new("../fuzz/corpus").join(target);
if !corpus.exists() {
std::fs::create_dir_all(&corpus).expect("failed to create corpus directory");
}
// Hash the data to get a unique name for the corpus item.
let mut hasher = DefaultHasher::new();
data.hash(&mut hasher);
let item_name = hex::encode(hasher.finish().to_be_bytes());
let item_path = corpus.join(item_name);
if item_path.exists() {
// Don't overwrite existing corpus items.
return;
}
// Write the data to the corpus item.
let mut file = File::create(item_path).expect("failed to create corpus item");
Write::write_all(&mut file, data).expect("failed to write to corpus item");
}