Add rle encode fuzz target

Signed-off-by: Jakub Sztandera <[email protected]>

Author: Kubuxu

testing/common_fuzz/fuzz/Cargo.toml

@@ -35,3 +35,9 @@ name = "rle_decode"
 path = "fuzz_targets/rle_decode.rs"
 test = false
 doc = false
+
+[[bin]]
+name = "rle_encode"
+path = "fuzz_targets/rle_encode.rs"
+test = false
+doc = false

testing/common_fuzz/fuzz/fuzz_targets/rle_encode.rs

@@ -0,0 +1,28 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use fvm_ipld_bitfield::BitField;
+use arbitrary::Arbitrary;
+
+#[derive(Debug, Arbitrary)]
+enum Operation {
+    Set(u64),
+    Unset(u64),
+}
+
+fuzz_target!(|data: (BitField, Vec<Operation>)| {
+    let (mut bf, ops) = data;
+
+    for op in ops {
+        match op {
+            Operation::Set(x) => { _ = bf.try_set(x);}
+            Operation::Unset(x) => {bf.unset(x);}
+        };
+    }
+
+    let bf_bytes = bf.to_bytes();
+    let bf2 = BitField::from_bytes(&bf_bytes).unwrap();
+    assert_eq!(bf, bf2);
+
+    let bf2_bytes = bf.to_bytes();
+    assert_eq!(bf_bytes, bf2_bytes);
+});