formats/zip/zlib_util.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 <cstddef>
#include <string>

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/string_view.h"
#include "riegeli/base/maker.h"
#include "riegeli/bytes/string_reader.h"
#include "riegeli/bytes/string_writer.h"
#include "riegeli/zlib/zlib_reader.h"
#include "riegeli/zlib/zlib_writer.h"

namespace credentio {

absl::StatusOr<std::string> Compress(absl::string_view data) {
  std::string compressed_data;
  riegeli::ZlibWriter<riegeli::StringWriter<>> writer(
      riegeli::Maker(&compressed_data),
      riegeli::ZlibWriterBase::Options()
          .set_header(riegeli::ZlibWriterBase::Header::kRaw)
          .set_compression_level(1));
  if (!writer.Write(data) || !writer.Close()) {
    return absl::InternalError("Failed to compress data.");
  }
  return compressed_data;
}

absl::StatusOr<std::string> Uncompress(absl::string_view data,
                                       size_t max_uncompressed_size) {
  riegeli::ZlibReader<riegeli::StringReader<>> reader(
      riegeli::Maker(data), riegeli::ZlibReaderBase::Options().set_header(
                                riegeli::ZlibReaderBase::Header::kRaw));
  std::string uncompressed_data;
  reader.Read(max_uncompressed_size, uncompressed_data);
  if (reader.Pull() || !reader.Close()) {
    return absl::InternalError("Failed to uncompress data.");
  }
  return uncompressed_data;
}

}  // namespace credentio