ceph/src/Beast/include/beast/zlib/impl/error.ipp

   1 //
   2 // Copyright (c) 2013-2017 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 // This is a derivative work based on Zlib, copyright below:
   8 /*
   9     Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler
  10
  11     This software is provided 'as-is', without any express or implied
  12     warranty.  In no event will the authors be held liable for any damages
  13     arising from the use of this software.
  14
  15     Permission is granted to anyone to use this software for any purpose,
  16     including commercial applications, and to alter it and redistribute it
  17     freely, subject to the following restrictions:
  18
  19     1. The origin of this software must not be misrepresented; you must not
  20        claim that you wrote the original software. If you use this software
  21        in a product, an acknowledgment in the product documentation would be
  22        appreciated but is not required.
  23     2. Altered source versions must be plainly marked as such, and must not be
  24        misrepresented as being the original software.
  25     3. This notice may not be removed or altered from any source distribution.
  26
  27     Jean-loup Gailly        Mark Adler
  28     jloup@gzip.org          madler@alumni.caltech.edu
  29
  30     The data format used by the zlib library is described by RFCs (Request for
  31     Comments) 1950 to 1952 in the files http://tools.ietf.org/html/rfc1950
  32     (zlib format), rfc1951 (deflate format) and rfc1952 (gzip format).
  33 */
  34
  35 #ifndef BEAST_ZLIB_IMPL_ERROR_IPP
  36 #define BEAST_ZLIB_IMPL_ERROR_IPP
  37
  38 #include <beast/core/error.hpp>
  39 #include <type_traits>
  40
  41 namespace boost {
  42 namespace system {
  43 template<>
  44 struct is_error_code_enum<beast::zlib::error>
  45 {
  46     static bool const value = true;
  47 };
  48 } // system
  49 } // boost
  50
  51 namespace beast {
  52 namespace zlib {
  53 namespace detail {
  54
  55 class zlib_error_category : public error_category
  56 {
  57 public:
  58     const char*
  59     name() const noexcept override
  60     {
  61         return "zlib";
  62     }
  63
  64     std::string
  65     message(int ev) const override
  66     {
  67         switch(static_cast<error>(ev))
  68         {
  69         case error::need_buffers: return "need buffers";
  70         case error::end_of_stream: return "end of stream";
  71         case error::stream_error: return "stream error";
  72
  73         case error::invalid_block_type: return "invalid block type";
  74         case error::invalid_stored_length: return "invalid stored block length";
  75         case error::too_many_symbols: return "too many symbols";
  76         case error::invalid_code_lenths: return "invalid code lengths";
  77         case error::invalid_bit_length_repeat: return "invalid bit length repeat";
  78         case error::missing_eob: return "missing end of block code";
  79         case error::invalid_literal_length: return "invalid literal/length code";
  80         case error::invalid_distance_code: return "invalid distance code";
  81         case error::invalid_distance: return "invalid distance";
  82
  83         case error::over_subscribed_length: return "over-subscribed length";
  84         case error::incomplete_length_set: return "incomplete length set";
  85
  86         case error::general:
  87         default:
  88             return "zlib error";
  89         }
  90     }
  91
  92     error_condition
  93     default_error_condition(int ev) const noexcept override
  94     {
  95         return error_condition{ev, *this};
  96     }
  97
  98     bool
  99     equivalent(int ev,
 100         error_condition const& condition
 101             ) const noexcept override
 102     {
 103         return condition.value() == ev &&
 104             &condition.category() == this;
 105     }
 106
 107     bool
 108     equivalent(error_code const& error, int ev) const noexcept override
 109     {
 110         return error.value() == ev &&
 111             &error.category() == this;
 112     }
 113 };
 114
 115 inline
 116 error_category const&
 117 get_error_category()
 118 {
 119     static zlib_error_category const cat{};
 120     return cat;
 121 }
 122
 123 } // detail
 124
 125 inline
 126 error_code
 127 make_error_code(error ev)
 128 {
 129     return error_code{
 130         static_cast<std::underlying_type<error>::type>(ev),
 131             detail::get_error_category()};
 132 }
 133
 134 } // zlib
 135 } // beast
 136
 137 #endif