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ferro-ta-main/fuzz/fuzz_targets/fuzz_macd.rs

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+/*!
+Fuzz target for `ferro_ta_core::overlap::macd`.
+
+Verifies that MACD never panics and that all three output vectors
+(macd, signal, histogram) match the input length.
+*/
+
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use ferro_ta_core::overlap;
+
+fuzz_target!(|data: &[u8]| {
+    if data.len() < 4 {
+        return;
+    }
+
+    // Extract periods from first 3 bytes (1-64 range each)
+    let fastperiod = ((data[0] as usize) % 32) + 1;
+    let slowperiod = ((data[1] as usize) % 32) + fastperiod + 1; // slow > fast
+    let signalperiod = ((data[2] as usize) % 32) + 1;
+
+    let float_bytes = &data[3..];
+    let n_floats = float_bytes.len() / 8;
+    if n_floats == 0 {
+        return;
+    }
+
+    let close: Vec<f64> = (0..n_floats)
+        .map(|i| {
+            let chunk: [u8; 8] = float_bytes[i * 8..(i + 1) * 8].try_into().unwrap();
+            f64::from_le_bytes(chunk)
+        })
+        .collect();
+
+    let (macd, signal, hist) = overlap::macd(&close, fastperiod, slowperiod, signalperiod);
+
+    assert_eq!(macd.len(), close.len(), "MACD line length mismatch");
+    assert_eq!(signal.len(), close.len(), "MACD signal length mismatch");
+    assert_eq!(hist.len(), close.len(), "MACD histogram length mismatch");
+});