# 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.
#
################################################################################

#!/bin/bash

# build libpng using the upstream-provided build.sh.
# it will also build the vanilla (non-proto) fuzz target,
# but we discard it.
(cd libpng/ && contrib/oss-fuzz/build.sh && rm -rf $OUT/*)

# Compile png_fuzz_proto.proto; should produce two files in genfiles/:
# png_fuzz_proto.pb.cc  png_fuzz_proto.pb.h
rm -rf genfiles && mkdir genfiles && LPM/external.protobuf/bin/protoc png_fuzz_proto.proto --cpp_out=genfiles

# compile the upstream-provided vanilla fuzz target
# but replace LLVMFuzzerTestOneInput with FuzzPNG so that
# png_proto_fuzzer_example.cc can call FuzzPNG from its own
# LLVMFuzzerTestOneInput.
$CXX $CXXFLAGS -c -DLLVMFuzzerTestOneInput=FuzzPNG libpng/contrib/oss-fuzz/libpng_read_fuzzer.cc -I libpng

# compile & link the rest
$CXX $CXXFLAGS -DNDEBUG png_proto_fuzzer_example.cc libpng_read_fuzzer.o genfiles/png_fuzz_proto.pb.cc \
  -I genfiles -I.  -I libprotobuf-mutator/  -I LPM/external.protobuf/include \
  -lz \
  LPM/src/libfuzzer/libprotobuf-mutator-libfuzzer.a \
  LPM/src/libprotobuf-mutator.a \
  LPM/external.protobuf/lib/libprotobuf.a \
  libpng/.libs/libpng16.a \
  $LIB_FUZZING_ENGINE \
  -o $OUT/png_proto_fuzzer_example

# custom png proto mutator
$CXX $CXXFLAGS -DNDEBUG png_proto_fuzzer_example.cc png_proto_mutator.cc libpng_read_fuzzer.o genfiles/png_fuzz_proto.pb.cc \
  -I genfiles -I.  -I libprotobuf-mutator/  -I LPM/external.protobuf/include \
  -lz \
  LPM/src/libfuzzer/libprotobuf-mutator-libfuzzer.a \
  LPM/src/libprotobuf-mutator.a \
  LPM/external.protobuf/lib/libprotobuf.a \
  libpng/.libs/libpng16.a \
  $LIB_FUZZING_ENGINE \
  -o $OUT/png_proto_fuzzer_example_custom_mutator

echo > dummy.cc

# A target, w/o protos but with a specialized custom mutator.
$CXX $CXXFLAGS -c libpng/contrib/oss-fuzz/libpng_read_fuzzer.cc -I libpng
$CXX $CXXFLAGS dummy.cc \
   -include fuzzer-test-suite/libpng-1.2.56/png_mutator.h \
   -D PNG_MUTATOR_DEFINE_LIBFUZZER_CUSTOM_MUTATOR \
   libpng_read_fuzzer.o \
  -lz \
  libpng/.libs/libpng16.a \
  $LIB_FUZZING_ENGINE \
  -o $OUT/png_custom_mutator_fuzzer_example

# An experimental out-of-tree target, with a specialized custom mutator.
$CXX $CXXFLAGS libpng_transforms_fuzzer.cc \
   -include fuzzer-test-suite/libpng-1.2.56/png_mutator.h \
   -D PNG_MUTATOR_DEFINE_LIBFUZZER_CUSTOM_MUTATOR \
   -I libpng \
  -lz \
  libpng/.libs/libpng16.a \
  $LIB_FUZZING_ENGINE \
  -o $OUT/png_transforms_fuzzer