src/OpenFOAM/db/IOstreams/hashes/OSHA1stream.H

   1 /*---------------------------------------------------------------------------*\
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   7 -------------------------------------------------------------------------------
   8 License
   9     This file is part of OpenFOAM.
  10
  11     OpenFOAM is free software; you can redistribute it and/or modify it
  12     under the terms of the GNU General Public License as published by the
  13     Free Software Foundation; either version 2 of the License, or (at your
  14     option) any later version.
  15
  16     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
  17     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19     for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with OpenFOAM; if not, write to the Free Software Foundation,
  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 Class
  26     Foam::OSHA1stream
  27
  28 Description
  29     An output stream for calculating SHA1 digests.
  30
  31 SourceFiles
  32     OSHA1stream.C
  33
  34 \*---------------------------------------------------------------------------*/
  35
  36 #ifndef OSHA1stream_H
  37 #define OSHA1stream_H
  38
  39 #include "OSstream.H"
  40 #include "SHA1.H"
  41
  42 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
  43
  44 namespace Foam
  45 {
  46
  47 class osha1stream;
  48 class OSHA1stream;
  49
  50 /*---------------------------------------------------------------------------*\
  51                         Class sha1streambuf Declaration
  52 \*---------------------------------------------------------------------------*/
  53
  54 //- A streambuf class for calculating SHA1 digests
  55 class sha1streambuf
  56 :
  57     public std::streambuf
  58 {
  59     // Private data
  60
  61     //- This does all the work and has its own buffering
  62     SHA1 sha1_;
  63
  64     friend class osha1stream;
  65
  66 public:
  67
  68     // Constructors
  69
  70         //- Construct null
  71         sha1streambuf()
  72         {}
  73
  74     // Member Functions
  75
  76     // Write
  77
  78         //- Process unbuffered
  79         virtual std::streamsize xsputn(const char* str, std::streamsize n)
  80         {
  81             sha1_.append(str, n);
  82             return n;
  83         }
  84 };
  85
  86
  87 /*---------------------------------------------------------------------------*\
  88                          Class osha1stream Declaration
  89 \*---------------------------------------------------------------------------*/
  90
  91 //- A basic output stream for calculating SHA1 digests
  92 class osha1stream
  93 :
  94     virtual public std::ios,
  95     public std::ostream
  96 {
  97     // Private data
  98
  99     sha1streambuf sbuf_;
 100
 101 public:
 102
 103     // Constructors
 104
 105         //- Construct null
 106         osha1stream()
 107         :
 108             std::ostream(&sbuf_)
 109         {}
 110
 111     // Member Functions
 112
 113     // Access
 114
 115         //- This hides both signatures of std::basic_ios::rdbuf()
 116         sha1streambuf* rdbuf()
 117         {
 118             return &sbuf_;
 119         }
 120
 121         //- Full access to the sha1
 122         SHA1& sha1()
 123         {
 124             return sbuf_.sha1_;
 125         }
 126
 127 };
 128
 129
 130 /*---------------------------------------------------------------------------*\
 131                          Class OSHA1stream Declaration
 132 \*---------------------------------------------------------------------------*/
 133
 134 //- The output stream for calculating SHA1 digests
 135 class OSHA1stream
 136 :
 137     public OSstream
 138 {
 139
 140     // Private Member Functions
 141
 142         //- Disallow default bitwise copy construct
 143         OSHA1stream(const OSHA1stream&);
 144
 145         //- Disallow default bitwise assignment
 146         void operator=(const OSHA1stream&);
 147
 148 public:
 149
 150     // Constructors
 151
 152         //- Construct and set stream status
 153         OSHA1stream
 154         (
 155             streamFormat format=ASCII,
 156             versionNumber version=currentVersion
 157         )
 158         :
 159             OSstream
 160             (
 161                 *(new osha1stream),
 162                 "OSHA1stream.sinkFile_",
 163                 format,
 164                 version
 165             )
 166         {}
 167
 168
 169     // Destructor
 170
 171         ~OSHA1stream()
 172         {
 173             delete &dynamic_cast<osha1stream&>(stream());
 174         }
 175
 176
 177     // Member functions
 178
 179     // Access
 180
 181         //- Full access to the sha1
 182         Foam::SHA1& sha1()
 183         {
 184             return dynamic_cast<osha1stream&>(stream()).sha1();
 185         }
 186
 187         //- Return SHA1::Digest for the data processed until now
 188         Foam::SHA1Digest digest()
 189         {
 190             return sha1().digest();
 191         }
 192
 193     // Edit
 194
 195         //- Clear the SHA1 calculation
 196         void rewind()
 197         {
 198             sha1().clear();
 199         }
 200
 201 };
 202
 203
 204 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 205
 206 } // End namespace Foam
 207
 208 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 209
 210 #endif
 211
 212 // ************************************************************************* //