hphp/util/gzip.h

   1 /*
   2    +----------------------------------------------------------------------+
   3    | HipHop for PHP                                                       |
   4    +----------------------------------------------------------------------+
   5    | Copyright (c) 2010-present Facebook, Inc. (http://www.facebook.com)  |
   6    +----------------------------------------------------------------------+
   7    | This source file is subject to version 3.01 of the PHP license,      |
   8    | that is bundled with this package in the file LICENSE, and is        |
   9    | available through the world-wide-web at the following url:           |
  10    | http://www.php.net/license/3_01.txt                                  |
  11    | If you did not receive a copy of the PHP license and are unable to   |
  12    | obtain it through the world-wide-web, please send a note to          |
  13    | license@php.net so we can mail you a copy immediately.               |
  14    +----------------------------------------------------------------------+
  15 */
  16
  17 #ifndef incl_HPHP_GZIP_H_
  18 #define incl_HPHP_GZIP_H_
  19
  20 #include "hphp/util/string-holder.h"
  21 #include <zlib.h>
  22
  23 // encoding_mode
  24 #define CODING_GZIP     1
  25 #define CODING_DEFLATE  2
  26
  27 namespace HPHP {
  28 ///////////////////////////////////////////////////////////////////////////////
  29
  30 // inefficient way of testing whether a file can be compressed to smaller size
  31 bool is_compressible_file(const char *filename);
  32
  33 char *gzencode(const char *data, int &len, int level, int encoding_mode);
  34 char *gzdecode(const char *data, int &len);
  35
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 // Supports producing GZIP- or DEFLATE-compatible output via the encoding_mode
  39 // flag.
  40 struct GzipCompressor {
  41   GzipCompressor(int level, int encoding_mode, bool header);
  42   ~GzipCompressor();
  43
  44   /**
  45    * Compress one chunk a time.
  46    */
  47   StringHolder compress(const char *data, int &len, bool trailer);
  48
  49  public:
  50   static bool s_useLocalArena;
  51
  52  private:
  53   int m_encoding;
  54   bool m_header;
  55   z_stream m_stream;
  56   uLong m_crc;
  57   bool m_ended;
  58 };
  59
  60 ///////////////////////////////////////////////////////////////////////////////
  61 }
  62
  63 #endif  // incl_HPHP_GZIP_H_