//*CMZ : 2.22/05 10/06/99 18.45.43 by Fons Rademakers
//*CMZ : 2.22/02 25/05/99 19.13.11 by Fons Rademakers
//*CMZ : 2.00/07 17/05/98 12.27.35 by Fons Rademakers
//*CMZ : 2.00/06 13/05/98 18.12.36 by Fons Rademakers
//*CMZ : 1.03/01 15/08/97 18.08.32 by Fons Rademakers
//*-- Author : Fons Rademakers 19/12/96
//*KEEP,CopyRight,T=C.
/*************************************************************************
* Copyright(c) 1995-1999, The ROOT System, All rights reserved. *
* Authors: Rene Brun, Fons Rademakers. *
* For list of contributors see $ROOTSYS/AA_CREDITS. *
* *
* Permission to use, copy, modify and distribute this software and its *
* documentation for non-commercial purposes is hereby granted without *
* fee, provided that the above copyright notice appears in all copies *
* and that both the copyright notice and this permission notice appear *
* in the supporting documentation. The authors make no claims about the *
* suitability of this software for any purpose. It is provided "as is" *
* without express or implied warranty. *
*************************************************************************/
//*KEND.
//////////////////////////////////////////////////////////////////////////
// //
// TMessage //
// //
// Message buffer class used for serializing objects and sending them //
// over a network. This class inherits from TBuffer the basic I/O //
// serializer. //
// //
//////////////////////////////////////////////////////////////////////////
//*KEEP,TMessage,T=C++.
#include "TMessage.h"
//*KEEP,Bytes.
#include "Bytes.h"
//*KEND.
ClassImp(TMessage)
//______________________________________________________________________________
TMessage::TMessage(UInt_t what) : TBuffer(kWrite)
{
// Create a TMessage object for storing objects. The "what" integer
// describes the type of message. Predifined ROOT system message types
// can be found in MessageTypes.h. Make sure your own message types are
// unique from the ROOT defined message types (i.e. 0 - 10000 are
// reserved by ROOT). In case you OR "what" with kMESS_ACK, the message
// will wait for an acknowledgement from the remote side. This makes
// the sending process synchronous.
// space at the beginning of the message to contain the message length
UInt_t reserved = 0;
*this << reserved;
fClass = 0;
fWhat = what;
*this << what;
}
//______________________________________________________________________________
TMessage::TMessage(void *buf, Int_t bufsize) : TBuffer(kRead, bufsize, buf)
{
// Create a TMessage object for reading objects. The objects will be
// read from buf. Use the What() method to get the message type.
// pretend there is space at the beginning for the message length
// this word will never be accessed, only used for offset calculation
fBuffer -= sizeof(UInt_t);
*this >> fWhat;
if (fWhat == kMESS_OBJECT) {
InitMap();
fClass = ReadClass(); // get first the class stored in message
Reset();
} else
fClass = 0;
}
//______________________________________________________________________________
TMessage::~TMessage()
{
// TMessage dtor. In case we were reading reset fBuffer.
if (IsReading())
fBuffer += sizeof(UInt_t);
}
//______________________________________________________________________________
void TMessage::Reset()
{
// Reset the message buffer so we can use (i.e. fill) it again.
SetBufferOffset(sizeof(fWhat) + sizeof(UInt_t));
ResetMap();
}
//______________________________________________________________________________
void TMessage::SetLength() const
{
// Set the message length at the beginning of the message buffer.
// This method is only called by TSocket::Send().
if (IsWriting()) {
char *buf = Buffer();
tobuf(buf, (UInt_t)(Length() - sizeof(UInt_t)));
}
}
//______________________________________________________________________________
void TMessage::SetWhat(UInt_t what)
{
// Using this method one can change the message type a posteriory.
char *buf = Buffer();
if (IsWriting())
buf += sizeof(UInt_t); // skip reserved space
tobuf(buf, what);
fWhat = what;
}
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