dataRecordFile.hpp

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/*
 * Copyright (c) 2014 Patrick P. Frey
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
#ifndef _STRUS_BASE_DATA_RECORD_FILE_HPP_INCLUDED
#define _STRUS_BASE_DATA_RECORD_FILE_HPP_INCLUDED
#include "strus/base/fileio.hpp"
#include <vector>
#include <string>
#include <cstdio>

namespace strus
{

#ifdef _MSC_VER
class DataRecordFile;
//... Posix file functions do not open a file in shared read mode in Windows.
//    Therefore we need an own implementation with Win file functions that is not available yet.
#else
class DataRecordFile
{
public:
        enum Mode {NoAccess=0x0, SharedRead=0x1, ExclusiveAppendWrite=0x4};

public:
        DataRecordFile();
        ~DataRecordFile();

        bool open( const std::string& filename, const Mode& mode_, unsigned int recordsize_, unsigned int headersize_=0, const void* headerstruct=0);

        const void* read( std::size_t fpos);

        const void* read();

        const void* header();
        
        bool append( const void* recbuf);

        bool close();

        int error() const;

        std::size_t recordsize() const          {return m_recordsize;}

        std::size_t size();

private:
        FILE* m_fh;                     
        Mode m_mode;                    
        int m_errno;                    
        unsigned int m_recordsize;      
        unsigned int m_headersize;      
        std::size_t m_recordindex;      
        void* m_recbuf;
        void* m_hdrbuf;

private:
#if __cplusplus >= 201103L
        DataRecordFile( const DataRecordFile&) = delete;
        void operator=( const DataRecordFile&) = delete;
#else
        DataRecordFile( const DataRecordFile&){} 
        void operator=( const DataRecordFile&){} 
#endif
};
#endif

}//namespace
#endif