fuzz: add a fuzz target for descriptor parsing

Co-Authored-By: Andrew Poelstra <apoelstra@wpsoftware.net>
Signed-off-by: Antoine Poinsot <darosior@protonmail.com>

fuzz/Cargo.toml

@@ -43,4 +43,8 @@ path = "fuzz_targets/roundtrip_semantic.rs"
 
 [[bin]]
 name = "compile_descriptor"
-path = "fuzz_targets/compile_descriptor.rs"
+path = "fuzz_targets/compile_descriptor.rs"
+
+[[bin]]
+name = "parse_descriptor"
+path = "fuzz_targets/parse_descriptor.rs"

fuzz/fuzz_targets/parse_descriptor.rs

@@ -0,0 +1,33 @@
+extern crate miniscript;
+
+use miniscript::descriptor::DescriptorPublicKey;
+use std::str::FromStr;
+
+fn do_test(data: &[u8]) {
+    let data_str = String::from_utf8_lossy(data);
+    if let Ok(dpk) = DescriptorPublicKey::from_str(&data_str) {
+        let output = dpk.to_string();
+        assert_eq!(data_str.to_lowercase(), output.to_lowercase());
+    }
+}
+
+#[cfg(feature = "afl")]
+extern crate afl;
+#[cfg(feature = "afl")]
+fn main() {
+    afl::read_stdio_bytes(|data| {
+        do_test(&data);
+    });
+}
+
+#[cfg(feature = "honggfuzz")]
+#[macro_use]
+extern crate honggfuzz;
+#[cfg(feature = "honggfuzz")]
+fn main() {
+    loop {
+        fuzz!(|data| {
+            do_test(data);
+        });
+    }
+}