#!/bin/bash -eu

# Copyright 2017-2018 Glenn Randers-Pehrson

# Copyright 2016 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.

#

# Last changed in libpng 1.6.35 [July 15, 2018]

#

# Revisions by Glenn Randers-Pehrson, 2017:

# 1. Build only the library, not the tools (changed "make -j$(nproc) all" to

# "make -j$(nproc) libpng16.la").

# 2. Disabled WARNING and WRITE options in pnglibconf.dfa.

# 3. Build zlib alongside libpng

################################################################################

# Disable logging via library build configuration control.

cat scripts/pnglibconf.dfa | \

sed -e "s/option STDIO/option STDIO disabled/" \

-e "s/option WARNING /option WARNING disabled/" \

-e "s/option WRITE enables WRITE_INT_FUNCTIONS/option WRITE disabled/" \

> scripts/pnglibconf.dfa.temp

mv scripts/pnglibconf.dfa.temp scripts/pnglibconf.dfa

# build the libpng library.

autoreconf -f -i

./configure --with-libpng-prefix=OSS_FUZZ_

make -j$(nproc) clean

make -j$(nproc) libpng16.la

# build libpng_read_fuzzer.

$CXX $CXXFLAGS -std=c++11 -I. \

$SRC/libpng/contrib/oss-fuzz/libpng_read_fuzzer.cc \

-o $OUT/libpng_read_fuzzer \

-lFuzzingEngine .libs/libpng16.a -lz

# add seed corpus.

find $SRC/libpng -name "*.png" | grep -v crashers | \

xargs zip $OUT/libpng_read_fuzzer_seed_corpus.zip

cp $SRC/libpng/contrib/oss-fuzz/*.dict \

$SRC/libpng/contrib/oss-fuzz/*.options $OUT/