Add fuzzer for Brunsli decoder (#4205)

projects/brunsli/Dockerfile

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+# Copyright 2020 Google Inc.
+#
+# 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 apt-get update && apt-get install -y cmake libtool make
+
+RUN git clone --depth 1 https://github.com/google/brunsli.git && \
+    cd brunsli && \
+    git submodule update --init --depth 1
+WORKDIR brunsli
+COPY build.sh $SRC/

projects/brunsli/build.sh

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+#!/bin/bash -eu
+# Copyright 2020 Google Inc.
+#
+# 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.
+#
+################################################################################
+
+cmake . -DBUILD_TESTING=OFF
+make clean
+make -j$(nproc) brunslidec-static
+
+# TODO(eustas): add seed corpus
+
+$CXX $CXXFLAGS -std=c++11 -I./c/include c/tests/fuzz_decode.cc \
+    -o $OUT/fuzz_decode $LIB_FUZZING_ENGINE \
+    ./libbrunslidec-static.a ./libbrunslicommon-static.a \
+    ./third_party/brotli/libbrotlidec-static.a \
+    ./third_party/brotli/libbrotlicommon-static.a
+
+$CXX $CXXFLAGS -std=c++11 -I./c/include c/tests/fuzz_decode_streaming.cc \
+    -o $OUT/fuzz_decode_streaming $LIB_FUZZING_ENGINE \
+    ./libbrunslidec-static.a ./libbrunslicommon-static.a \
+    ./third_party/brotli/libbrotlidec-static.a \
+    ./third_party/brotli/libbrotlicommon-static.a

projects/brunsli/project.yaml

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+homepage: "https://github.com/google/brunsli"
+language: c++
+primary_contact: "eustas@chromium.org"
+vendor_ccs:
+  - "jkew@mozilla.com"
+  - "twsmith@mozilla.com"
+fuzzing_engines:
+  - libfuzzer
+  - afl
+  - honggfuzz
+sanitizers:
+  - address
+  - memory
+  - undefined
+architectures:
+  - x86_64
+  - i386