Limit Zopfli iterations in write fuzzing

fuzz/fuzz_targets/fuzz_write.rs

@@ -54,7 +54,8 @@ fn do_operation<T>(writer: &mut RefCell<zip_next::ZipWriter<T>>,
     let name = operation.name;
     match operation.basic {
         BasicFileOperation::WriteNormalFile {contents, mut options, ..} => {
-            if contents.iter().map(Vec::len).sum::<usize>() >= u32::MAX as usize {
+            let uncompressed_size = contents.iter().map(Vec::len).sum::<usize>();
+            if uncompressed_size >= u32::MAX as usize {
                 options = options.large_file(true);
             }
             writer.borrow_mut().start_file(name, options)?;

src/write.rs

@@ -170,7 +170,7 @@ impl arbitrary::Arbitrary<'_> for FileOptions {
         match options.compression_method {
             Deflated => {
                 if bool::arbitrary(u)? {
-                    let level = u.int_in_range(0..=265)?;
+                    let level = u.int_in_range(0..=24)?;
                     options.compression_level = Some(level);
                     #[cfg(feature = "deflate-zopfli")]
                     if level > Compression::best().level().try_into().unwrap() {
@@ -334,6 +334,11 @@ impl FileOptions {
         self.zopfli_buffer_size = size;
         self
     }
+
+    /// Returns the compression level currently set.
+    pub fn get_compression_level(&self) -> Option<i32> {
+        self.compression_level
+    }
 }
 
 impl Default for FileOptions {