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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;

}