ceph/src/boost/boost/beast/zlib/detail/ranges.hpp

   1 //
   2 // Copyright (c) 2016-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
   3 //
   4 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6 //
   7 // Official repository: https://github.com/boostorg/beast
   8 //
   9 // This is a derivative work based on Zlib, copyright below:
  10 /*
  11     Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
  12
  13     This software is provided 'as-is', without any express or implied
  14     warranty.  In no event will the authors be held liable for any damages
  15     arising from the use of this software.
  16
  17     Permission is granted to anyone to use this software for any purpose,
  18     including commercial applications, and to alter it and redistribute it
  19     freely, subject to the following restrictions:
  20
  21     1. The origin of this software must not be misrepresented; you must not
  22        claim that you wrote the original software. If you use this software
  23        in a product, an acknowledgment in the product documentation would be
  24        appreciated but is not required.
  25     2. Altered source versions must be plainly marked as such, and must not be
  26        misrepresented as being the original software.
  27     3. This notice may not be removed or altered from any source distribution.
  28
  29     Jean-loup Gailly        Mark Adler
  30     jloup@gzip.org          madler@alumni.caltech.edu
  31
  32     The data format used by the zlib library is described by RFCs (Request for
  33     Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
  34     (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
  35 */
  36
  37 #ifndef BOOST_BEAST_ZLIB_DETAIL_RANGES_HPP
  38 #define BOOST_BEAST_ZLIB_DETAIL_RANGES_HPP
  39
  40 #include <cstdint>
  41 #include <type_traits>
  42
  43 namespace boost {
  44 namespace beast {
  45 namespace zlib {
  46 namespace detail {
  47
  48 struct ranges
  49 {
  50     template<bool isConst>
  51     struct range
  52     {
  53         using iter_t =
  54             typename std::conditional<isConst,
  55                 std::uint8_t const*,
  56                 std::uint8_t*>::type;
  57
  58         iter_t first;
  59         iter_t last;
  60         iter_t next;
  61
  62         // total bytes in range
  63         std::size_t
  64         size() const
  65         {
  66             return last - first;
  67         }
  68
  69         // bytes consumed
  70         std::size_t
  71         used() const
  72         {
  73             return next - first;
  74         }
  75
  76         // bytes remaining
  77         std::size_t
  78         avail() const
  79         {
  80             return last - next;
  81         }
  82     };
  83
  84     range<true> in;
  85     range<false> out;
  86 };
  87
  88 // Clamp u to v where u and v are different types
  89 template<class U, class V>
  90 inline
  91 U
  92 clamp(U u, V v)
  93 {
  94     if(u > v)
  95         u = static_cast<U>(v);
  96     return u;
  97 }
  98
  99 } // detail
 100 } // zlib
 101 } // beast
 102 } // boost
 103
 104 #endif