third_party/SPIRV-Tools/test/fuzzers/spvtools_binary_parser_fuzzer.cpp

// Copyright (c) 2018 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.

#include <cstdint>
#include <vector>

#include "spirv-tools/libspirv.hpp"

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  if (size < sizeof(spv_target_env) + 1) return 0;

  const spv_context context =
      spvContextCreate(*reinterpret_cast<const spv_target_env*>(data));
  if (context == nullptr) return 0;

  data += sizeof(spv_target_env);
  size -= sizeof(spv_target_env);

  std::vector<uint32_t> input;
  input.resize(size >> 2);

  size_t count = 0;
  for (size_t i = 0; (i + 3) < size; i += 4) {
    input[count++] = data[i] | (data[i + 1] << 8) | (data[i + 2] << 16) |
                     (data[i + 3]) << 24;
  }

  spvBinaryParse(context, nullptr, input.data(), input.size(), nullptr, nullptr,
                 nullptr);

  spvContextDestroy(context);
  return 0;
}