扩展指标

2026-07-09 05:08:16 +08:00
commit 308c46ab9a
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+/*!
+Fuzz target for `ferro_ta_core::momentum::stoch`.
+
+Verifies that STOCH never panics, output lengths match, and finite
+values lie in [0, 100].
+*/
+
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use ferro_ta_core::momentum;
+
+fuzz_target!(|data: &[u8]| {
+    if data.len() < 4 {
+        return;
+    }
+
+    let fastk_period = ((data[0] as usize) % 32) + 1;
+    let slowk_period = ((data[1] as usize) % 16) + 1;
+    let slowd_period = ((data[2] as usize) % 16) + 1;
+
+    // Need 3 f64s per bar (high, low, close)
+    let float_bytes = &data[3..];
+    let n_floats = float_bytes.len() / 8;
+    let n_bars = n_floats / 3;
+    if n_bars == 0 {
+        return;
+    }
+
+    let all_floats: Vec<f64> = (0..n_bars * 3)
+        .map(|i| {
+            let chunk: [u8; 8] = float_bytes[i * 8..(i + 1) * 8].try_into().unwrap();
+            f64::from_le_bytes(chunk)
+        })
+        .collect();
+
+    let high = &all_floats[..n_bars];
+    let low = &all_floats[n_bars..n_bars * 2];
+    let close = &all_floats[n_bars * 2..n_bars * 3];
+
+    let (slowk, slowd) = momentum::stoch(high, low, close, fastk_period, slowk_period, slowd_period);
+
+    assert_eq!(slowk.len(), high.len(), "STOCH slowk length mismatch");
+    assert_eq!(slowd.len(), high.len(), "STOCH slowd length mismatch");
+
+    // Finite values should be in [0, 100]
+    for (i, &v) in slowk.iter().enumerate() {
+        if v.is_finite() {
+            assert!(
+                v >= 0.0 && v <= 100.0,
+                "STOCH slowk[{i}] = {v} is out of [0, 100]"
+            );
+        }
+    }
+    for (i, &v) in slowd.iter().enumerate() {
+        if v.is_finite() {
+            assert!(
+                v >= 0.0 && v <= 100.0,
+                "STOCH slowd[{i}] = {v} is out of [0, 100]"
+            );
+        }
+    }
+});