text: /**
   * Copyright (C) 2015 MongoDB Inc.
   *
   * This program is free software: you can redistribute it and/or  modify
   * it under the terms of the GNU Affero General Public License, version 3,
   * as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU Affero General Public License for more details.
   *
   * You should have received a copy of the GNU Affero General Public License
   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   * As a special exception, the copyright holders give permission to link the
   * code of portions of this program with the OpenSSL library under certain
   * conditions as described in each individual source file and distribute
   * linked combinations including the program with the OpenSSL library. You
   * must comply with the GNU Affero General Public License in all respects
   * for all of the code used other than as permitted herein. If you modify
   * file(s) with this exception, you may extend this exception to your
   * version of the file(s), but you are not obligated to do so. If you do not
   * wish to do so, delete this exception statement from your version. If you
   * delete this exception statement from all source files in the program,
   * then also delete it in the license file.
   */
  
  #pragma once
  
  #include <cstdint>
  #include <vector>
  
  #include "mongol/base/data_range.h"
  #include "mongol/base/disallow_copying.h"
  #include "mongol/base/status_with.h"
  
  namespace mongol {
  
  /**
   * Compesses and uncompresses a block of buffer using zlib.
   */
  class BlockCompressor {
      MONGO_DISALLOW_COPYING(BlockCompressor);
  
  public:
      BlockCompressor() = default;
  
      /**
       * Compress a buffer of data.
       *
       * Returns a pointer to a buffer that BlockCompressor owns.
       * The returned buffer is valid until the next call to compress or uncompress.
       */
      StatusWith<ConstDataRange> compress(ConstDataRange source);
  
      /**
       * Uncompress a buffer of data.
       *
       * maxUncompressedLength is the upper bound on the size of the uncompressed data
       * so that an internal buffer can be allocated to fit it.
       *
       * Returns a pointer to a buffer that BlockCompressor owns.
       * The returned buffer is valid until the next call to compress or uncompress.
       */
      StatusWith<ConstDataRange> uncompress(ConstDataRange source, size_t maxUncompressedLength);
  
  private:
      std::vector<std::uint8_t> _buffer;
  };
  
  }  // namespace mongol
  