GzipIfstream.h

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//                   OpenMS -- Open-Source Mass Spectrometry
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// Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
// ETH Zurich, and Freie Universitaet Berlin 2002-2012.
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// $Maintainer: David Wojnar $
// $Authors: David Wojnar $
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#ifndef OPENMS_FORMAT_GZIPIFSTREAM_H
#define OPENMS_FORMAT_GZIPIFSTREAM_H

#include <OpenMS/config.h>
#include <zlib.h>

namespace OpenMS
{
  class OPENMS_DLLAPI GzipIfstream
  {
public:
    GzipIfstream();
    GzipIfstream(const char * filename);
    virtual ~GzipIfstream();

    size_t read(char * s, size_t n);

    bool streamEnd() const;

    bool isOpen() const;

    void open(const char * filename);

    void close();

    /*
        @brief updates crc32 check sum whether the buffer is corrupted
        @note if this function is used it has to be called after every call of function read
        @param s the buffer which will be checked
        @param n the size of the buffer
    *
    //void updateCRC32(const char* s,const size_t n);

    *
        @brief  checks if data is corrupted after crc32 was computed
        @note   it can only be used if updateCRC32 was called after every call of function read
        @return true if the buffer and hence the file is corrupted; no decompression is possible
    *
    //bool isCorrupted();

    //unsigned long Crc32_ComputeBuf( unsigned long inCrc32, const void *buf,
//                                 size_t bufLen );*/

protected:

    gzFile gzfile_;
    int     n_buffer_;
    int     gzerror_;
    bool stream_at_end_;

    //needed if one wants to know whetther file is okay
    //unsigned long original_crc;
    //needed if one wants to know whetther file is okay
    //unsigned long crc;

    GzipIfstream(const GzipIfstream & bzip2);
    GzipIfstream & operator=(const GzipIfstream & bzip2);
  };

  inline bool GzipIfstream::isOpen() const
  {
    return gzfile_ != NULL;
  }

  inline bool GzipIfstream::streamEnd() const
  {
    return stream_at_end_;
  }

/*  inline bool GzipIfstream::isCorrupted()
    {
        std::cout<<"CRC"<<crc<<std::endl;
        return (crc != original_crc);
    }*/

} //namespace OpenMS
#endif //OPENMS_FORMAT_GZIPIFSTREAM_H