include/git2/zlib.h

   1 /*
   2  * This file is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License, version 2,
   4  * as published by the Free Software Foundation.
   5  *
   6  * In addition to the permissions in the GNU General Public License,
   7  * the authors give you unlimited permission to link the compiled
   8  * version of this file into combinations with other programs,
   9  * and to distribute those combinations without any restriction
  10  * coming from the use of this file.  (The General Public License
  11  * restrictions do apply in other respects; for example, they cover
  12  * modification of the file, and distribution when not linked into
  13  * a combined executable.)
  14  *
  15  * This file is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  23  * Boston, MA 02110-1301, USA.
  24  */
  25 #ifndef INCLUDE_git_zlib_h__
  26 #define INCLUDE_git_zlib_h__
  27
  28 #include <zlib.h>
  29
  30 /**
  31  * @file git2/zlib.h
  32  * @brief Git data compression routines
  33  * @defgroup git_zlib Git data compression routines
  34  * @ingroup Git
  35  * @{
  36  */
  37 GIT_BEGIN_DECL
  38
  39 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  40 /**
  41  * deflateBound returns an upper bound on the compressed size.
  42  *
  43  * This is a stub function used when zlib does not supply the
  44  * deflateBound() implementation itself.
  45  *
  46  * @param stream the stream pointer.
  47  * @param s total length of the source data (in bytes).
  48  * @return maximum length of the compressed data.
  49  */
  50 GIT_INLINE(size_t) deflateBound(z_streamp stream, size_t s)
  51 {
  52         return (s + ((s + 7) >> 3) + ((s + 63) >> 6) + 11);
  53 }
  54 #endif
  55
  56 /** @} */
  57 GIT_END_DECL
  58 #endif