OSS-Fuzz: OSS-Fuzz integration and new fuzzers

fuzz/Cargo.toml

@@ -20,3 +20,7 @@ members = ["."]
 [[bin]]
 name = "fuzz_target_1"
 path = "fuzz_targets/fuzz_target_1.rs"
+
+[[bin]]
+name = "fuzz_conversion"
+path = "fuzz_targets/fuzz_conversion.rs"

fuzz/fuzz_targets/fuzz_conversion.rs

@@ -0,0 +1,65 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![no_main]
+
+#[macro_use] extern crate libfuzzer_sys;
+extern crate httpdate;
+
+use httpdate::HttpDate;
+use std::time::{SystemTime, UNIX_EPOCH};
+use std::convert::TryInto;
+
+fuzz_target!(|data: &[u8]| {
+    // Skip this round if data is not enough
+    if data.len() < 8 {
+        return;
+    }
+
+    // Create system time object
+    let secs_since_epoch = u64::from_le_bytes(data[0..8].try_into().unwrap_or_default());
+    let duration = std::time::Duration::from_secs(secs_since_epoch);
+    let system_time = match UNIX_EPOCH.checked_add(duration) {
+        Some(time) => time,
+        None => return,
+    };
+
+    // Skip value that could make HttpDate panic
+    if secs_since_epoch >= 253402300800 {
+        return;
+    }
+
+    // Fuzz other functions
+    let http_date = HttpDate::from(system_time);
+    let _ = SystemTime::from(http_date);
+    let _ = http_date.to_string();
+
+    // Fuzz partial_cmp if enough data is left
+    if data.len() >= 16 {
+        let other_secs_since_epoch = u64::from_le_bytes(data[8..16].try_into().unwrap_or_default());
+        let other_duration = std::time::Duration::from_secs(other_secs_since_epoch);
+        let other_system_time = match UNIX_EPOCH.checked_add(other_duration) {
+            Some(time) => time,
+            None => return,
+        };
+
+        // Skip value that could make HttpDate panic
+        if other_secs_since_epoch >= 253402300800 {
+            return;
+        }
+
+        let other_http_date = HttpDate::from(other_system_time);
+        let _ = http_date.partial_cmp(&other_http_date);
+    }
+});