Updated c-blosc to use fuzzers in c-blosc repository. (#4018)

Use compat files for seed corpus with new decompress_fuzzer.

projects/c-blosc/Dockerfile

@@ -19,4 +19,4 @@ MAINTAINER blosc.oss.fuzz@gmail.com
 RUN apt-get update && apt-get install -y make autoconf automake libtool cmake
 RUN git clone --depth 1 https://github.com/Blosc/c-blosc.git c-blosc
 WORKDIR c-blosc
-COPY build.sh blosc_fuzzer.cc $SRC/
+COPY build.sh $SRC/

projects/c-blosc/blosc_fuzzer.cc

@@ -1,33 +0,0 @@
-// Copyright 2019 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.
-
-#include <stddef.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include "blosc/blosc.h"
-
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
-  if (size < BLOSC_MIN_HEADER_LENGTH) return 0;
-
-  size_t nbytes, cbytes, blocksize;
-  blosc_cbuffer_sizes(data, &nbytes, &cbytes, &blocksize);
-  if (cbytes != size) return 0;
-  if (nbytes == 0) return 0;
-
-  void *output = malloc(nbytes);
-  blosc_decompress_ctx(data, output, nbytes, /*numinternalthreads=*/1);
-  free(output);
-  return 0;
-}

projects/c-blosc/build.sh

@@ -15,17 +15,15 @@
 #
 ################################################################################
 
-# build project
-mkdir -p build_dir
-pushd build_dir
-cmake ..
+# Build project
+cmake . -DCMAKE_C_FLAGS="$CFLAGS" -DCMAKE_CXX_FLAGS="$CXXFLAGS" -DBUILD_FUZZERS=ON
+make clean
 make -j$(nproc)
-popd
 
-# build fuzzers
-for fuzzers in $(find $SRC -name '*_fuzzer.cc'); do
-  fuzz_basename=$(basename -s .cc $fuzzers)
-  $CXX $CXXFLAGS -std=c++11 -I. -I../blosc/ \
-  $fuzzers $LIB_FUZZING_ENGINE ./build_dir/blosc/libblosc.a  \
-  -o $OUT/$fuzz_basename
-done
+# Package seed corpus
+zip -j $OUT/decompress_fuzzer_seed_corpus.zip compat/*.cdata
+
+# Copy the fuzzer executables, zip-ed corpora, and dictionary files to $OUT
+find . -name '*_fuzzer' -exec cp -v '{}' $OUT ';'
+find . -name '*_fuzzer.dict' -exec cp -v '{}' $OUT ';'
+find . -name '*_fuzzer_seed_corpus.zip' -exec cp -v '{}' $OUT ';'

projects/c-blosc/project.yaml

@@ -1,9 +1,12 @@
 homepage: "https://github.com/Blosc/c-blosc"
 language: c++
 primary_contact: "blosc.oss.fuzz@gmail.com"
+auto_ccs:
+  - "nathan.moinvaziri@gmail.com"
 sanitizers:
   - address
   - memory
+  - undefined
 architectures:
   - x86_64
   - i386