snappy_compress_fuzzer.cc

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// libFuzzer harness for fuzzing snappy compression code.

#include <cassert>
#include <cstddef>
#include <cstdint>
#include <string>

#include "snappy.h"

// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  std::string input(reinterpret_cast<const char*>(data), size);

  std::string compressed;
  size_t compressed_size =
      snappy::Compress(input.data(), input.size(), &compressed);

  (void)compressed_size;  // Variable only used in debug builds.
  assert(compressed_size == compressed.size());
  assert(compressed.size() <= snappy::MaxCompressedLength(input.size()));
  assert(snappy::IsValidCompressedBuffer(compressed.data(), compressed.size()));

  std::string uncompressed_after_compress;
  bool uncompress_succeeded = snappy::Uncompress(
      compressed.data(), compressed.size(), &uncompressed_after_compress);

  (void)uncompress_succeeded;  // Variable only used in debug builds.
  assert(uncompress_succeeded);
  assert(input == uncompressed_after_compress);
  return 0;
}