add build script

fuzzing/ossfuzz.sh

@@ -0,0 +1,19 @@
+#!/bin/bash -eu
+
+# This script is meant to be run by
+# https://github.com/google/oss-fuzz/blob/master/projects/cjson/Dockerfile
+
+mkdir build
+cd build
+cmake -DBUILD_SHARED_LIBS=OFF -DENABLE_CJSON_TEST=OFF ..
+make -j$(nproc)
+
+$CXX $CXXFLAGS -std=c++11 -I. \
+    $SRC/cjson/fuzzing/cjson_read_fuzzer.cc \
+    -o $OUT/cjson_read_fuzzer \
+    $LIB_FUZZING_ENGINE $SRC/cjson/build/libcjson.a
+
+find $SRC/cjson/fuzzing/inputs -name "*" | \
+     xargs zip $OUT/cjson_read_fuzzer_seed_corpus.zip
+
+cp $SRC/cjson/fuzzing/json.dict $OUT/cjson_read_fuzzer.dict