UIPstream.H

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | Copyright (C) 2011-2013 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::UIPstream
 
Description
    Input inter-processor communications stream operating on external
    buffer.
 
SourceFiles
    UIPstream.C
 
\*---------------------------------------------------------------------------*/
 
#include "Pstream.H"
 
#ifndef UIPstream_H
#define UIPstream_H
 
#include "UPstream.H"
#include "Istream.H"
#include "PstreamBuffers.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class UIPstream Declaration
\*---------------------------------------------------------------------------*/
 
class UIPstream
:
    public UPstream,
    public Istream
{
    // Private data
 
        int fromProcNo_;
 
        DynamicList<char>& externalBuf_;
 
        label& externalBufPosition_;
 
        const int tag_;
 
        const label comm_;
 
        const bool clearAtEnd_;
 
        int messageSize_;
 
 
    // Private Member Functions
 
        //- Check the bufferPosition against messageSize_ for EOF
        inline void checkEof();
 
        //- Read a T from the transfer buffer
        template<class T>
        inline void readFromBuffer(T&);
 
        //- Read data from the transfer buffer
        inline void readFromBuffer(void* data, size_t count, size_t align);
 
 
public:
 
    // Constructors
 
        //- Construct given process index to read from and optional buffer size,
        //  read format and IO version
        UIPstream
        (
            const commsTypes commsType,
            const int fromProcNo,
            DynamicList<char>& externalBuf,
            label& externalBufPosition,
            const int tag = UPstream::msgType(),
            const label comm = UPstream::worldComm,
            const bool clearAtEnd = false,   // destroy externalBuf if at end
            streamFormat format=BINARY,
            versionNumber version=currentVersion
        );
 
        //- Construct given buffers
        UIPstream(const int fromProcNo, PstreamBuffers&);
 
 
    //- Destructor
    ~UIPstream();
 
 
    // Member functions
 
        // Inquiry
 
            //- Return flags of output stream
            ios_base::fmtflags flags() const
            {
                return ios_base::fmtflags(0);
            }
 
 
        // Read functions
 
            //- Read into given buffer from given processor and return the
            //  message size
            static label read
            (
                const commsTypes commsType,
                const int fromProcNo,
                char* buf,
                const std::streamsize bufSize,
                const int tag = UPstream::msgType(),
                const label communicator = 0
            );
 
            //- Return next token from stream
            Istream& read(token&);
 
            //- Read a character
            Istream& read(char&);
 
            //- Read a word
            Istream& read(word&);
 
            // Read a string (including enclosing double-quotes)
            Istream& read(string&);
 
            //- Read a label
            Istream& read(label&);
 
            //- Read a floatScalar
            Istream& read(floatScalar&);
 
            //- Read a doubleScalar
            Istream& read(doubleScalar&);
 
            //- Read binary block
            Istream& read(char*, std::streamsize);
 
            //- Rewind and return the stream so that it may be read again
            Istream& rewind();
 
 
        // Edit
 
            //- Set flags of stream
            ios_base::fmtflags flags(const ios_base::fmtflags)
            {
                return ios_base::fmtflags(0);
            }
 
 
        // Print
 
            //- Print description of IOstream to Ostream
            void print(Ostream&) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //