pasn.h

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/*
 * pasn.h
 *
 * Abstract Syntax Notation 1 classes for support of SNMP only.
 *
 * Portable Windows Library
 *
 * Copyright (c) 1993-2002 Equivalence Pty. Ltd.
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Original Code is Portable Windows Library.
 *
 * The Initial Developer of the Original Code is Equivalence Pty. Ltd.
 *
 * Contributor(s): ______________________________________.
 */

#ifndef PTLIB_PASN_H
#define PTLIB_PASN_H

#ifdef P_USE_PRAGMA
#pragma interface
#endif

#include <ptlib/sockets.h>

//
// define some types used by the ASN classes
//
typedef PInt32  PASNInt;
typedef DWORD   PASNUnsigned;
typedef DWORD           PASNOid;

class PASNObject;
class PASNSequence;

PARRAY(PASNObjectArray, PASNObject);



class PASNObject : public PObject
{
  PCLASSINFO(PASNObject, PObject)

  public:
    enum ASNType {
      Integer,      
      String,       
      ObjectID,     
      Sequence,     
      Choice,       
      IPAddress,    
      Counter,      
      Gauge,        
      TimeTicks,    
      Opaque,       
      NsapAddress,  
      Counter64,    
      UInteger32,   
      Null,         
      Unknown,      
      ASNTypeMax    
    };

    virtual ASNType GetType() const;


    int GetChoice() const;

    virtual PString GetTypeAsString() const;

    virtual PASNInt GetInteger () const;

    virtual PASNUnsigned GetUnsigned () const;

    virtual PString GetString () const;

    virtual const PASNSequence & GetSequence() const;

    virtual PIPSocket::Address GetIPAddress () const;

    virtual void PrintOn(
      ostream & strm    
    ) const;

    virtual void Encode(
      PBYTEArray & buffer  
    );

    virtual WORD GetEncodedLength();

    virtual PObject * Clone() const;

    static void EncodeASNLength (
      PBYTEArray & buffer,    
      WORD length             
    );

    static WORD GetASNLengthLength (
      WORD length             
    );

    static PBoolean DecodeASNLength (
      const PBYTEArray & buffer,  
      PINDEX & ptr,               
      WORD & len                  
    );

    static void EncodeASNSequenceStart (
      PBYTEArray & buffer,       
      BYTE type,                 
      WORD length                
    );

    static WORD GetASNSequenceStartLength (
      WORD length               
    );

    static void EncodeASNHeader(
      PBYTEArray & buffer,        
      PASNObject::ASNType type,   
      WORD length                 
    );

    static WORD GetASNHeaderLength (
      WORD length              
    );

    static void EncodeASNInteger    (
      PBYTEArray & buffer,     
      PASNInt data,            
      PASNObject::ASNType type  
    );
    // Encode an ASN integer value into the specified buffer */

    static void EncodeASNUnsigned (
      PBYTEArray & buffer,     
      PASNUnsigned data,       
      PASNObject::ASNType type 
    );
    // Encode an ASN integer value into the specified buffer */

    static WORD GetASNIntegerLength (
      PASNInt data      
    );
    // Return the length of an encoded ASN integer with the specified value 

    static WORD GetASNUnsignedLength (
      PASNUnsigned data   
    );
    // Return the length of an encoded ASN integer with the specified value 

    static PBoolean DecodeASNInteger (
      const PBYTEArray & buffer,  
      PINDEX & ptr,               
      PASNInt & value,            
      ASNType type = Integer         
    );
    // Decode an ASN integer value in the specified buffer 

    static PBoolean DecodeASNUnsigned (
      const PBYTEArray & buffer,  
      PINDEX & ptr,               
      PASNUnsigned & value,       
      ASNType type = TimeTicks         
    );
    // Decode an ASN integer value in the specified buffer 

  protected:
    PASNObject();

    static BYTE ASNTypeToType[ASNTypeMax];

};



class PASNInteger : public PASNObject
{
  PCLASSINFO(PASNInteger, PASNObject)
  public:
    PASNInteger(PASNInt val);
    PASNInteger(const PBYTEArray & buffer, PINDEX & ptr);

    void PrintOn(ostream & strm) const;
    void Encode(PBYTEArray & buffer);
    WORD GetEncodedLength();
    PObject * Clone() const;

    PASNInt GetInteger() const;
    PString GetString () const;
    ASNType GetType() const;
    PString GetTypeAsString() const;

  private:
    PASNInt value;
};



class PASNString : public PASNObject
{
  PCLASSINFO(PASNString, PASNObject)
  public:
    PASNString(const PString & str);
    PASNString(const BYTE * ptr, int len);
    PASNString(const PBYTEArray & buffer,               PASNObject::ASNType = String);
    PASNString(const PBYTEArray & buffer, PINDEX & ptr, PASNObject::ASNType = String);

    void PrintOn(ostream & strm) const;

    void Encode(PBYTEArray & buffer)
      { Encode(buffer, String); }

    WORD GetEncodedLength();
    PObject * Clone() const;

    PString GetString() const;
    ASNType GetType() const;
    PString GetTypeAsString() const;

  protected:
    PBoolean Decode(const PBYTEArray & buffer, PINDEX & i, PASNObject::ASNType type);
    void Encode(PBYTEArray & buffer,             PASNObject::ASNType type);

    PString value;
    WORD    valueLen;
};



class PASNIPAddress : public PASNString
{
  PCLASSINFO(PASNIPAddress, PASNString)
  public:
    PASNIPAddress(const PIPSocket::Address & addr)
      : PASNString((const BYTE *)addr.GetPointer(), addr.GetSize()) { }

    PASNIPAddress(const PString & str);

    PASNIPAddress(const PBYTEArray & buffer)
      : PASNString(buffer, IPAddress) { }

    PASNIPAddress(const PBYTEArray & buffer, PINDEX & ptr)
      : PASNString(buffer, ptr, IPAddress) { }

    PASNObject::ASNType GetType() const
      { return IPAddress; }

    void Encode(PBYTEArray & buffer)
      { PASNString::Encode(buffer, IPAddress); }

    PString GetString() const;

    PString GetTypeAsString() const;

    PObject * Clone() const
      { return PNEW PASNIPAddress(*this); }

    PIPSocket::Address GetIPAddress () const;
};



class PASNUnsignedInteger : public PASNObject
{
  PCLASSINFO(PASNUnsignedInteger, PASNObject)
  public:
    PASNUnsignedInteger(PASNUnsigned val)
      { value = val; }

    PASNUnsignedInteger(const PBYTEArray & buffer, PINDEX & ptr);

    void PrintOn(ostream & strm) const;
    WORD GetEncodedLength();
    PString GetString () const;
    PASNUnsigned GetUnsigned() const;

  protected:
    PASNUnsignedInteger()
      { value = 0; }

    PBoolean Decode(const PBYTEArray & buffer, PINDEX & i, PASNObject::ASNType theType);
    void Encode(PBYTEArray & buffer, PASNObject::ASNType theType);

  private:
    PASNUnsigned value;
};



class PASNTimeTicks : public PASNUnsignedInteger
{
  PCLASSINFO(PASNTimeTicks, PASNUnsignedInteger)
  public:
    PASNTimeTicks(PASNUnsigned val) 
      : PASNUnsignedInteger(val) { }

    PASNTimeTicks(const PBYTEArray & buffer, PINDEX & ptr)
      { PASNUnsignedInteger::Decode(buffer, ptr, TimeTicks); }

    void Encode(PBYTEArray & buffer)
      { PASNUnsignedInteger::Encode(buffer, TimeTicks); }

    PObject * Clone() const
      { return PNEW PASNTimeTicks(*this); }

    PASNObject::ASNType GetType() const
      { return TimeTicks; }

    PString GetTypeAsString() const;
};



class PASNCounter : public PASNUnsignedInteger
{
  PCLASSINFO(PASNCounter, PASNUnsignedInteger)
  public:
    PASNCounter(PASNUnsigned val) 
      : PASNUnsignedInteger(val) { }

    PASNCounter(const PBYTEArray & buffer, PINDEX & ptr)
      {  PASNUnsignedInteger::Decode(buffer, ptr, Counter); }

    void Encode(PBYTEArray & buffer)
      { PASNUnsignedInteger::Encode(buffer, Counter); }

    PObject * Clone() const
      { return PNEW PASNCounter(*this); }

    PASNObject::ASNType GetType() const
      { return Counter; }

    PString GetTypeAsString() const;
};



class PASNGauge : public PASNUnsignedInteger
{
  PCLASSINFO(PASNGauge, PASNUnsignedInteger)
  public:
    PASNGauge(PASNUnsigned val) 
      : PASNUnsignedInteger(val) { }

    PASNGauge(const PBYTEArray & buffer, PINDEX & ptr)
      { Decode(buffer, ptr); }

    PBoolean Decode(const PBYTEArray & buffer, PINDEX & i)
      { return PASNUnsignedInteger::Decode(buffer, i, Gauge); }

    void Encode(PBYTEArray & buffer)
      { PASNUnsignedInteger::Encode(buffer, Gauge); }

    PObject * Clone() const
      { return PNEW PASNGauge(*this); }

    PASNObject::ASNType GetType() const
      { return Gauge; }

    PString GetTypeAsString() const;
};




class PASNObjectID : public PASNObject
{
  PCLASSINFO(PASNObjectID, PASNObject)
  public:
    PASNObjectID(const PString & str);
    PASNObjectID(PASNOid * val, BYTE theLen);
    PASNObjectID(const PBYTEArray & buffer);
    PASNObjectID(const PBYTEArray & buffer, PINDEX & ptr);

    void PrintOn(ostream & strm) const;
    void Encode(PBYTEArray & buffer);
    WORD GetEncodedLength();
    PObject * Clone() const;

    ASNType GetType() const;
    PString GetString () const;
    PString GetTypeAsString() const;

  protected:
    PBoolean Decode(const PBYTEArray & buffer, PINDEX & i);

  private:
    PDWORDArray value;
};



class PASNNull : public PASNObject
{
  PCLASSINFO(PASNNull, PASNObject)
  public:
    PASNNull();
    PASNNull(const PBYTEArray & buffer, PINDEX & ptr);

    void PrintOn(ostream & strm) const;

    void Encode(PBYTEArray & buffer);
    WORD GetEncodedLength();

    PObject * Clone() const;

    ASNType GetType() const;
    PString GetString () const;
    PString GetTypeAsString() const;
};



class PASNSequence : public PASNObject
{
  PCLASSINFO(PASNSequence, PASNObject)
  public:
    PASNSequence();
    PASNSequence(BYTE selector);
    PASNSequence(const PBYTEArray & buffer);
    PASNSequence(const PBYTEArray & buffer, PINDEX & i);

    void Append(PASNObject * obj);
    PINDEX GetSize() const;
    PASNObject & operator [] (PINDEX idx) const;
    const PASNSequence & GetSequence() const;

    void AppendInteger (PASNInt value);
    void AppendString  (const PString & str);
    void AppendObjectID(const PString & str);
    void AppendObjectID(PASNOid * val, BYTE len);

    int GetChoice() const;

//    PASNInt GetInteger (PINDEX idx) const;
//    PString GetString  (PINDEX idx) const;

    void PrintOn(ostream & strm) const;
    void Encode(PBYTEArray & buffer);
    PBoolean Decode(const PBYTEArray & buffer, PINDEX & i);
    WORD GetEncodedLength();
    ASNType GetType() const;
    PString GetTypeAsString() const;

    PBoolean Encode(PBYTEArray & buffer, PINDEX maxLen) ;

  private:
    PASNObjectArray sequence;
    BYTE     type;
    ASNType  asnType;
    WORD     encodedLen;
    WORD     seqLen;
};


#endif // PTLIB_PASN_H


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