asn1reader.h

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// OSB library ************************************************ -*- C++ -*-
/*
  AUTHOR(S): Stephan Broennimann (vb)

  RCS information
   $Name: OSB_060808 $
   $Revision: 1.1 $

  License
   OSB rating and billing library for communication networks
   Copyright (C) 2004, 2005, 2006  OSB systems

   This file may be distributed and/or modify under the terms of the
   GNU General Public License (GPL) as published by the Free Software
   Foundation which is provided in the file LICENSE.GPL included in the
   packaging of this file.

   The file 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.

   Holders of a OSB Commercial License may use this file under the terms
   and conditions of this commercial license.
 */
#ifndef _ASN1READER_H_
#define _ASN1READER_H_

// ************************************************************************
// included header files
// + standard includes
#include <cstdio>

// + libraries

// + local headers
#include "asn1.h"
#include "osberror.h"

// + class declarations
namespace OSB_LIB {
    class OsbErrors;
}

// ************************************************************************
// namespace extensions
namespace OSB_LIB {

// ************************************************************************
// forward declarations
    class Asn1Reader;

// ************************************************************************
// class definitions
    class Asn1Info {
        friend class Asn1Reader;
    public:
        explicit Asn1Info(long filePos = -1);
    public:
        long filePos() const;
        size_t tagValue() const;
        const Asn1Tag& tag() const;
        const Asn1Len& dataLen() const;
        const Asn1Byte* data() const;

        size_t nextMember(Asn1Info& dest);

    private:                                // Asn1Reader only
        size_t getTagAndLen(
            const Asn1Byte* data,
                  size_t    size
        );

        size_t construct(
            const Asn1Byte* data,
                  size_t    size
        );

    private:
        long filePos_;
        Asn1Tag  tag_;
        Asn1Len  dataLen_;
        size_t asn1Size_;

        const Asn1Byte* data_;
        size_t curPos_;
    };                                  // class Asn1Info

    class Asn1Reader {
    public:
        Asn1Reader();
        ~Asn1Reader();
    private:
        Asn1Reader(const Asn1Reader&);
        Asn1Reader& operator=(const Asn1Reader&);

    public:
        void init();

        void init(
            size_t   blkSize,
            Asn1Byte blkFiller
        );

        bool nextAsn1(FILE* input);

        const Asn1Info& info() const;

        Asn1Info& info();

        void asn1Data(Asn1Data& dest) const;

    private:
        void reserve(
            size_t size,
            bool   exact
        );
        bool getFlat(FILE* input);
        bool getBlock(FILE* input);
    private:
        size_t blkSize_;
        Asn1Byte blkFiller_;

        Asn1Byte* buffer_;
        size_t bufSize_;

        size_t dataSize_;
        size_t curPos_;
        long bufFilePos_;

        long bytesRead_;

        Asn1Info  info_;
    };                                  // class Asn1Reader
}                                       // namespace OSB_LIB

// ************************************************************************
// inline definitions
namespace OSB_LIB {
    inline long Asn1Info::filePos() const
    {
        return filePos_;
    }

    inline size_t Asn1Info::tagValue() const
    {
        return tag_.value();
    }

    inline const OSB_LIB::Asn1Tag& Asn1Info::tag() const
    {
        return tag_;
    }

    inline const OSB_LIB::Asn1Len& Asn1Info::dataLen() const
    {
        return dataLen_;
    }

    inline const Asn1Byte* Asn1Info::data() const
    {
        return data_;
    }
}                                       // namespace OSB_LIB
#endif                                  // #ifndef _ASN1READER_H_

---