hphp/util/cache/magic-numbers.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 // Magic numbers associated with this cache.
  18
  19 #ifndef incl_HPHP_MAGIC_NUMBERS_H_
  20 #define incl_HPHP_MAGIC_NUMBERS_H_
  21
  22 namespace HPHP {
  23
  24 const uint64_t kCacheFileMagic = 0x55aa0cb0cefa4b52;
  25 const uint64_t kDirectoryTerminatorMagic = 0x5228bb574d524554;
  26
  27 // This one should only be on disk during the write process.
  28 // See cache-saver.h for a discussion of the "surgical updates".
  29 const uint64_t kDataOfsPlaceholder = 0x000044448888aaaa;
  30
  31 }  // namespace HPHP
  32
  33 #endif  // incl_HPHP_MAGIC_NUMBERS_H_