make fuzz checks more lenient (#133)

Author: samuelcolvin

Cargo.toml

@@ -15,7 +15,7 @@ keywords = ["JSON", "parsing", "deserialization", "iter"]
 categories = ["parser-implementations", "parsing"]
 homepage = "https://github.com/pydantic/jiter/"
 repository = "https://github.com/pydantic/jiter/"
-rust-version = "1.73.0"
+rust-version = "1.74.0"
 
 [profile.bench]
 debug = true

crates/fuzz/fuzz_targets/compare_to_serde.rs

@@ -88,8 +88,13 @@ fn errors_equal(jiter_error: &JiterError, serde_error: &SerdeError, json_data: &
     } else if matches!(jiter_error.error_type, JiterJsonErrorType::InvalidUnicodeCodePoint) {
         // https://github.com/serde-rs/json/issues/1083
         remove_suffix(&jiter_error_str) == remove_suffix(&serde_error_str)
+    } else if jiter_error_str.starts_with("invalid escape at line")
+        && serde_error_str.starts_with("invalid escape at line")
+    {
+        // see fuzz failures on #130
+        true
     } else {
-        return jiter_error_str == serde_error_str;
+        jiter_error_str == serde_error_str
     }
 }
 

crates/jiter/Cargo.toml

@@ -29,7 +29,7 @@ paste = "1.0.7"
 serde_json = {version = "1.0.87", features = ["preserve_order", "arbitrary_precision", "float_roundtrip"]}
 serde = "1.0.147"
 pyo3 = { workspace = true, features = ["auto-initialize"] }
-codspeed-bencher-compat = "2.3.1"
+codspeed-bencher-compat = "2.7.1"
 
 [build-dependencies]
 pyo3-build-config = { workspace = true, optional = true }

crates/jiter/tests/main.rs

@@ -615,6 +615,16 @@ fn bad_high_order_string_tail() {
     assert_eq!(e.description(&bytes), "invalid unicode code point at line 1 column 5")
 }
 
+#[test]
+fn invalid_escape_position() {
+    // from fuzzing on #130
+    let bytes = br#""con(\u0trol character (\u000.00"#;
+    let e = JsonValue::parse(bytes, false).unwrap_err();
+    assert_eq!(e.error_type, JsonErrorType::InvalidEscape);
+    assert_eq!(e.index, 8);
+    assert_eq!(e.description(bytes), "invalid escape at line 1 column 9")
+}
+
 #[test]
 fn simd_string_sizes() {
     for i in 0..100 {