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 #pragma once
  18
  19 #include "hphp/util/string-holder.h"
  20 #include <zlib.h>
  21
  22 // encoding_mode
  23 #define CODING_GZIP     1
  24 #define CODING_DEFLATE  2
  25
  26 namespace HPHP {
  27 ///////////////////////////////////////////////////////////////////////////////
  28
  29 // inefficient way of testing whether a file can be compressed to smaller size
  30 bool is_compressible_file(const char *filename);
  31
  32 char *gzencode(const char *data, int &len, int level, int encoding_mode);
  33 char *gzdecode(const char *data, int &len);
  34
  35 ///////////////////////////////////////////////////////////////////////////////
  36
  37 // Supports producing GZIP- or DEFLATE-compatible output via the encoding_mode
  38 // flag.
  39 struct GzipCompressor {
  40   GzipCompressor(int level, int encoding_mode, bool header);
  41   ~GzipCompressor();
  42
  43   /**
  44    * Compress one chunk a time.
  45    */
  46   StringHolder compress(const char *data, int &len, bool trailer);
  47
  48  public:
  49   static bool s_useLocalArena;
  50
  51  private:
  52   int m_encoding;
  53   bool m_header;
  54   z_stream m_stream;
  55   uLong m_crc;
  56   bool m_ended;
  57 };
  58
  59 ///////////////////////////////////////////////////////////////////////////////
  60 }
  61