OSHA1stream.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::OSHA1stream
 
Description
    An output stream for calculating SHA1 digests.
 
SourceFiles
    OSHA1stream.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef OSHA1stream_H
#define OSHA1stream_H
 
#include "OSstream.H"
#include "SHA1.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
class osha1stream;
class OSHA1stream;
 
/*---------------------------------------------------------------------------*\
                        Class sha1streambuf Declaration
\*---------------------------------------------------------------------------*/
 
//- A streambuf class for calculating SHA1 digests
class sha1streambuf
:
    public std::streambuf
{
    // Private data
 
    //- This does all the work and has its own buffering
    SHA1 sha1_;
 
    friend class osha1stream;
 
public:
 
    // Constructors
 
        //- Construct null
        sha1streambuf()
        {}
 
    // Member Functions
 
    // Write
 
        //- Process unbuffered
        virtual std::streamsize xsputn(const char* str, std::streamsize n)
        {
            sha1_.append(str, n);
            return n;
        }
};
 
 
/*---------------------------------------------------------------------------*\
                         Class osha1stream Declaration
\*---------------------------------------------------------------------------*/
 
//- A basic output stream for calculating SHA1 digests
class osha1stream
:
    virtual public std::ios,
    public std::ostream
{
    // Private data
 
    sha1streambuf sbuf_;
 
public:
 
    // Constructors
 
        //- Construct null
        osha1stream()
        :
            std::ostream(&sbuf_)
        {}
 
    // Member Functions
 
    // Access
 
        //- This hides both signatures of std::basic_ios::rdbuf()
        sha1streambuf* rdbuf()
        {
            return &sbuf_;
        }
 
        //- Full access to the sha1
        SHA1& sha1()
        {
            return sbuf_.sha1_;
        }
 
};
 
 
/*---------------------------------------------------------------------------*\
                         Class OSHA1stream Declaration
\*---------------------------------------------------------------------------*/
 
//- The output stream for calculating SHA1 digests
class OSHA1stream
:
    public OSstream
{
 
    // Private Member Functions
 
        //- Disallow default bitwise copy construct
        OSHA1stream(const OSHA1stream&);
 
        //- Disallow default bitwise assignment
        void operator=(const OSHA1stream&);
 
public:
 
    // Constructors
 
        //- Construct and set stream status
        OSHA1stream
        (
            streamFormat format=ASCII,
            versionNumber version=currentVersion
        )
        :
            OSstream
            (
                *(new osha1stream),
                "OSHA1stream.sinkFile_",
                format,
                version
            )
        {}
 
 
    //- Destructor
    ~OSHA1stream()
    {
        delete &dynamic_cast<osha1stream&>(stdStream());
    }
 
 
    // Member functions
 
    // Access
 
        //- Full access to the sha1
        Foam::SHA1& sha1()
        {
            return dynamic_cast<osha1stream&>(stdStream()).sha1();
        }
 
        //- Return SHA1::Digest for the data processed until now
        Foam::SHA1Digest digest()
        {
            return sha1().digest();
        }
 
    // Edit
 
        //- Clear the SHA1 calculation
        void rewind()
        {
            sha1().clear();
        }
 
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //