nom: initial integration (#5403)

* initial integration of nom.

* Updated maintainer email.

* cleanup.

projects/nom/Dockerfile

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+FROM gcr.io/oss-fuzz-base/base-builder
+
+RUN git clone --depth 1 https://github.com/Geal/nom/
+COPY fuzz $SRC/nom/fuzz
+WORKDIR $SRC
+
+COPY build.sh $SRC/

projects/nom/build.sh

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+#!/bin/bash -eu
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+cd $SRC/nom
+cargo fuzz build -O 
+cp fuzz/target/x86_64-unknown-linux-gnu/release/fuzz_arithmetic $OUT/

projects/nom/fuzz/Cargo.toml

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+
+[package]
+name = "nom-fuzz"
+version = "0.0.0"
+authors = ["David Korczynski <david@adalogics.com>"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.3"
+
+[dependencies.nom]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_arithmetic"
+path = "fuzz_targets/fuzz_arithmetic.rs"

projects/nom/fuzz/fuzz_targets/fuzz_arithmetic.rs

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+#![no_main]
+use libfuzzer_sys::fuzz_target;
+use std::str;
+
+extern crate nom;
+
+use nom::{
+  branch::alt,
+  bytes::complete::tag,
+  character::complete::char,
+  character::complete::{digit1 as digit, space0 as space},
+  combinator::map_res,
+  multi::fold_many0,
+  sequence::{delimited, pair},
+  IResult,
+};
+
+use std::str::FromStr;
+
+fn parens(i: &str) -> IResult<&str, i64> {
+      delimited(space, delimited(tag("("), expr, tag(")")), space)(i)
+}
+
+
+fn factor(i: &str) -> IResult<&str, i64> {
+  alt((
+    map_res(delimited(space, digit, space), FromStr::from_str),
+    parens,
+  ))(i)
+}
+
+
+fn term(i: &str) -> IResult<&str, i64> {
+  let (i, init) = factor(i)?;
+
+  fold_many0(
+    pair(alt((char('*'), char('/'))), factor),
+    init,
+    |acc, (op, val): (char, i64)| {
+      if op == '*' {
+        acc * val
+      } else {
+        acc / val
+      }
+    },
+  )(i)
+}
+
+fn expr(i: &str) -> IResult<&str, i64> {
+  let (i, init) = term(i)?;
+
+  fold_many0(
+    pair(alt((char('+'), char('-'))), term),
+    init,
+    |acc, (op, val): (char, i64)| {
+      if op == '+' {
+        acc + val
+      } else {
+        acc - val
+      }
+    },
+  )(i)
+}
+
+fuzz_target!(|data: &[u8]| {
+    // fuzzed code goes here
+    let temp = match str::from_utf8(data) {
+        Ok(v) => factor(v),
+        Err(e) => factor("2"),
+    };
+});

projects/nom/project.yaml

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+homepage: "https://github.com/Geal/nom"
+main_repo: "https://github.com/Geal/nom"
+primary_contact: "geo.couprie@gmail.com"
+sanitizers:
+  - address
+fuzzing_engines:
+  - libfuzzer
+language: rust
+auto_ccs:
+  - "david@adalogics.com"