hphp/util/compression.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_COMPRESSION_H_
  18 #define incl_HPHP_COMPRESSION_H_
  19
  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 struct StreamCompressor {
  38   StreamCompressor(int level, int encoding_mode, bool header);
  39   ~StreamCompressor();
  40
  41   /**
  42    * Compress one chunk a time.
  43    */
  44   char *compress(const char *data, int &len, bool trailer);
  45
  46 private:
  47   int m_encoding;
  48   bool m_header;
  49   z_stream m_stream;
  50   uLong m_crc;
  51   bool m_ended;
  52 };
  53
  54 ///////////////////////////////////////////////////////////////////////////////
  55 }
  56
  57 #endif  // incl_HPHP_COMPRESSION_H_