Fuzz wasmparser (#47)

fuzz/Cargo.toml

@@ -11,6 +11,7 @@ cargo-fuzz = true
 [dependencies]
 wasmi = { path = ".." }
 wabt = "0.1.7"
+wasmparser = "0.14.1"
 
 [dependencies.libfuzzer-sys]
 git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
@@ -22,3 +23,7 @@ members = ["."]
 [[bin]]
 name = "load"
 path = "fuzz_targets/load.rs"
+
+[[bin]]
+name = "load_wasmparser"
+path = "fuzz_targets/load_wasmparser.rs"

fuzz/fuzz_targets/load_wasmparser.rs

@@ -0,0 +1,29 @@
+#![no_main]
+#[macro_use]
+extern crate libfuzzer_sys;
+extern crate wasmi;
+extern crate wasmparser;
+
+use wasmparser::WasmDecoder;
+
+fn run_wasmparser(data: &[u8]) -> bool {
+	let mut parser = wasmparser::ValidatingParser::new(data, None);
+	let result = loop {
+		match *parser.read() {
+			wasmparser::ParserState::Error(..) => break false,
+			wasmparser::ParserState::EndWasm => break true,
+			_ => (),
+		}
+	};
+	result
+}
+
+fn run_wasmi(data: &[u8]) -> bool {
+	wasmi::Module::from_buffer(data).is_ok()
+}
+
+fuzz_target!(|data: &[u8]| {
+	let wasmparser_success = run_wasmparser(data);
+	let wasmi_success = run_wasmi(data);
+	assert_eq!(wasmparser_success, wasmi_success);
+});