fuzz: Add zkas Lexer fuzzer.

fuzz/Cargo.toml

@@ -12,6 +12,7 @@ libfuzzer-sys = "0.4"
 
 [dependencies.darkfi]
 path = ".."
+features = ["zkas"]
 
 [dependencies.darkfi-serial]
 path = "../src/serial"
@@ -29,3 +30,9 @@ name = "serial"
 path = "fuzz_targets/serial.rs"
 test = false
 doc = false
+
+[[bin]]
+name = "zkas-lexer"
+path = "fuzz_targets/zkas_lexer.rs"
+test = false
+doc = false

fuzz/fuzz_targets/serial.rs

@@ -1,3 +1,21 @@
+/* This file is part of DarkFi (https://dark.fi)
+ *
+ * Copyright (C) 2020-2023 Dyne.org foundation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
 #![no_main]
 extern crate darkfi_serial;
 use darkfi_serial::{deserialize, serialize};

fuzz/fuzz_targets/zkas_lexer.rs

@@ -0,0 +1,33 @@
+/* This file is part of DarkFi (https://dark.fi)
+ *
+ * Copyright (C) 2020-2023 Dyne.org foundation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+use darkfi::zkas::Lexer;
+
+// Run with: ZKAS_SILENT=1 cargo fuzz run zkas-lexer
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(source) = std::str::from_utf8(data) {
+        let filename = "fuzz0r";
+        let source = source.replace('\t', "    ").replace("\r\n", "\n");
+        let lexer = Lexer::new(filename, source.chars());
+        let _ = lexer.lex();
+    }
+});

src/zkas/error.rs

@@ -55,6 +55,10 @@ impl ErrorEmitter {
     }
 
     pub fn emit(&self, typ: &str, msg: &str) {
+        if let Ok(_) = std::env::var("ZKAS_SILENT") {
+            return
+        }
+
         let stderr = io::stderr();
         let mut handle = stderr.lock();