add fuzzer for transaction::OutPoint

fuzz/Cargo.toml

@@ -43,3 +43,7 @@ path = "fuzz_targets/deserialize_decimal.rs"
 [[bin]]
 name = "deserialize_udecimal"
 path = "fuzz_targets/deserialize_udecimal.rs"
+
+[[bin]]
+name = "outpoint_string"
+path = "fuzz_targets/outpoint_string.rs"

fuzz/fuzz_targets/outpoint_string.rs

@@ -0,0 +1,88 @@
+
+extern crate bitcoin;
+
+use bitcoin::blockdata::transaction::OutPoint;
+use bitcoin::consensus::encode;
+
+use std::str::FromStr;
+
+fn do_test(data: &[u8]) {
+    let lowercase: Vec<u8> = data.iter().map(|c| match *c {
+        b'A' => b'a',
+        b'B' => b'b',
+        b'C' => b'c',
+        b'D' => b'd',
+        b'E' => b'e',
+        b'F' => b'f',
+        x => x
+    }).collect();
+    let data_str = match String::from_utf8(lowercase) {
+        Err(_) => return,
+        Ok(s) => s,
+    };
+    match OutPoint::from_str(&data_str) {
+        Ok(op) => {
+            assert_eq!(op.to_string().as_bytes(), data_str.as_bytes());
+        }
+        Err(_) => {
+            // If we can't deserialize as a string, try consensus deserializing
+            let res: Result<OutPoint, _> = encode::deserialize(data);
+            if let Ok(deser) = res {
+                let ser = encode::serialize(&deser);
+                assert_eq!(ser, data);
+                let string = deser.to_string();
+                match OutPoint::from_str(&string) {
+                    Ok(destring) => assert_eq!(destring, deser),
+                    Err(_) => panic!()
+                }
+            }
+        }
+    }
+}
+
+#[cfg(feature = "afl")]
+#[macro_use] extern crate afl;
+#[cfg(feature = "afl")]
+fn main() {
+    fuzz!(|data| {
+        do_test(&data);
+    });
+}
+
+#[cfg(feature = "honggfuzz")]
+#[macro_use] extern crate honggfuzz;
+#[cfg(feature = "honggfuzz")]
+fn main() {
+    loop {
+        fuzz!(|data| {
+            do_test(data);
+        });
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    fn extend_vec_from_hex(hex: &str, out: &mut Vec<u8>) {
+        let mut b = 0;
+        for (idx, c) in hex.as_bytes().iter().enumerate() {
+            b <<= 4;
+            match *c {
+                b'A'...b'F' => b |= c - b'A' + 10,
+                b'a'...b'f' => b |= c - b'a' + 10,
+                b'0'...b'9' => b |= c - b'0',
+                _ => panic!("Bad hex"),
+            }
+            if (idx & 1) == 1 {
+                out.push(b);
+                b = 0;
+            }
+        }
+    }
+
+    #[test]
+    fn duplicate_crash() {
+        let mut a = Vec::new();
+        extend_vec_from_hex("00", &mut a);
+        super::do_test(&a);
+    }
+}