quotedprintablecodec.h
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1 /*
2  * Copyright (C) 2016 by Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 #ifndef CXXTOOLS_QUOTEDPRINTABLECODEC_H
29 #define CXXTOOLS_QUOTEDPRINTABLECODEC_H
30 
31 #include <cxxtools/textcodec.h>
32 #include <cxxtools/string.h>
33 
34 namespace cxxtools
35 {
36 
37 class QuotedPrintableCodec : public TextCodec<char, char>
38 {
39  public:
40  explicit QuotedPrintableCodec(size_t ref = 0)
41  : TextCodec<char, char>(ref)
42  {}
43 
45  {}
46 
47  protected:
48  result do_in(MBState& s,
49  const char* fromBegin,
50  const char* fromEnd,
51  const char*& fromNext,
52  char* toBegin,
53  char* toEnd,
54  char*& toNext) const;
55 
56  result do_out(MBState& s,
57  const char* fromBegin,
58  const char* fromEnd,
59  const char*& fromNext,
60  char* toBegin,
61  char* toEnd,
62  char*& toNext) const;
63 
64  // inheritdoc
65  std::codecvt_base::result do_unshift(cxxtools::MBState&, char*, char*, char*&) const;
66 
67  bool do_always_noconv() const throw()
68  {
69  return false;
70  }
71 
72  int do_length(MBState& /*s*/, const char* fromBegin,
73  const char* fromEnd, size_t max) const
74  {
75  const int from = (fromEnd - fromBegin) / 4;
76  const int to = max / 3;
77  return to > from ? from * 4 : to * 4;
78  }
79 
80  int do_encoding() const throw()
81  {
82  // stateful encoding
83  return -1;
84  }
85 
86  int do_max_length() const throw()
87  {
88  return 3;
89  }
90 
91  public:
99  static std::string decode(const char* data, unsigned size)
100  { return cxxtools::decode<QuotedPrintableCodec>(data, size); }
103  static std::string decode(const std::string& data)
104  { return cxxtools::decode<QuotedPrintableCodec>(data); }
105 
108  static std::string encode(const char* data, unsigned size)
109  { return cxxtools::encode<QuotedPrintableCodec>(data, size); }
110 
113  static std::string encode(const std::string& data)
114  { return cxxtools::encode<QuotedPrintableCodec>(data); }
115 };
116 
117 
118 } //namespace cxxtools
119 
120 #endif