formats/zip/zlib_util_test.cc

// Copyright 2026 Google LLC
//
// 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
//
//    https://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 "formats/zip/zlib_util.h"

#include <string>

#include "absl/status/status.h"
#include "absl/status/status_matchers.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"

namespace credentio {
namespace {

TEST(ZlibUtilTest, CompressUncompressE2E) {
  std::string data =
      "hello world! this is a test string to be compressed. hello world!";

  auto compressed = Compress(data);
  ABSL_ASSERT_OK(compressed);
  auto uncompressed = Uncompress(*compressed);
  ABSL_ASSERT_OK(uncompressed);

  EXPECT_EQ(*uncompressed, data);
}

TEST(ZlibUtilTest, UncompressInvalidDataFailed) {
  std::string data = "this is not a compressed string";

  EXPECT_THAT(Uncompress(data),
              absl_testing::StatusIs(absl::StatusCode::kInternal,
                                     "Failed to uncompress data."));
}

TEST(ZlibUtilTest, UncompressLargePayloadFailed) {
  std::string large_string(2 * 1024 * 1024, 'a');
  auto compressed = Compress(large_string);
  ABSL_ASSERT_OK(compressed);

  // To prevent ZIP bomb attacks, uncompressing a payload exceeding the maximum
  // allowed size will fail.
  EXPECT_THAT(Uncompress(*compressed),
              absl_testing::StatusIs(absl::StatusCode::kInternal,
                                     "Failed to uncompress data."));

  // Adjusting the maximum uncompressed size to a larger value will succeed.
  auto uncompressed =
      Uncompress(*compressed, /*max_uncompressed_size=*/3 * 1024 * 1024);
  ABSL_ASSERT_OK(uncompressed);
  EXPECT_EQ(*uncompressed, large_string);
}

}  // namespace
}  // namespace credentio