snappy_compress_fuzzer.cc

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// libFuzzer harness for fuzzing snappy compression code.

#include <stddef.h>
#include <stdint.h>

#include <cassert>
#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);
  for (int level = snappy::CompressionOptions::MinCompressionLevel();
       level <= snappy::CompressionOptions::MaxCompressionLevel(); ++level) {
    std::string compressed;
    size_t compressed_size =
        snappy::Compress(input.data(), input.size(), &compressed,
                         snappy::CompressionOptions{/*level=*/level});

    (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;
}