snappy/snappy-uncompress-fuzzer.cc

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// libFuzzer harness for fuzzing snappy decompression routine.

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

#include "snappy.h"

namespace snappy {

// Supplies random data sourced from libFuzzer to the snappy uncompressor,
// decompressing its output and running some checks in the process.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
  string input(reinterpret_cast<const char*>(data), size);

  size_t uncompressed_len = 0;
  bool getcomp_len_success = snappy::GetUncompressedLength(
    input.data(),
    input.size(),
    &uncompressed_len);
  // Check that GetUncompressedLength() does not return a very large
  // value (1 MB) on success.
  assert(!getcomp_len_success || uncompressed_len < (1 << 20));

  // Uncompress
  string uncompressed_out;
  bool uncompress_success = snappy::Uncompress(
    input.data(),
    input.size(),
    &uncompressed_out);

  assert(uncompress_success);
  return 0;
}

} // namespace snappy