text: /** @file
  
    A brief file description
  
    @section license License
  
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you 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
  
        http://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.
   */
  
  #pragma once
  
  #include <string>
  #include <list>
  
  // Defines for various GZIP constants
  static const int COMPRESSION_LEVEL = 6;
  static const int ZLIB_MEM_LEVEL    = 8;
  
  static const int GZIP_HEADER_SIZE  = 10;
  static const int GZIP_TRAILER_SIZE = 8;
  
  static const char MAGIC_BYTE_1 = 0x1f;
  static const char MAGIC_BYTE_2 = 0x8b;
  static const char OS_TYPE      = 3; // Unix
  
  static const int BUF_SIZE = 1 << 15; // 32k buffer
  
  namespace EsiLib
  {
  struct ByteBlock {
    const char *data;
    int data_len;
    ByteBlock(const char *d = nullptr, int d_len = 0) : data(d), data_len(d_len){};
  };
  
  typedef std::list<ByteBlock> ByteBlockList;
  
  bool gzip(const ByteBlockList &blocks, std::string &cdata);
  
  inline bool
  gzip(const char *data, int data_len, std::string &cdata)
  {
    ByteBlockList blocks;
    blocks.push_back(ByteBlock(data, data_len));
    return gzip(blocks, cdata);
  }
  
  typedef std::list<std::string> BufferList;
  
  bool gunzip(const char *data, int data_len, BufferList &buf_list);
  } // namespace EsiLib
  