tmsession.cpp

c++下s60终端对终端传输协议

/* Copyright (c) 2005, Forum Nokia. All rights reserved */

// INCLUDE FILES
#include <e32svr.h>
#include <s32file.h>
#include "TmSession.h"

_LIT(KEmpty, "<empty>");

// ========================= MEMBER FUNCTIONS =================================

// ----------------------------------------------------------------------------
// CTmServerSession::NewL()
// Two-phased constructor.
// ----------------------------------------------------------------------------
//
CTmServerSession* CTmServerSession::NewL( CTmServer& aServer )
    {
    CTmServerSession* self = CTmServerSession::NewLC( aServer );
    CleanupStack::Pop( self );
    return self;
    }

// ----------------------------------------------------------------------------
// CTmServerSession::NewLC()
// Two-phased constructor.
// ----------------------------------------------------------------------------
//
CTmServerSession* CTmServerSession::NewLC( CTmServer& aServer )
    {
    CTmServerSession* self = new ( ELeave ) CTmServerSession( aServer );
    CleanupStack::PushL( self );
    self->ConstructL();
    return self;
    }

// ----------------------------------------------------------------------------
// CTmServerSession::ConstructL()
// Symbian 2nd phase constructor can leave.
// ----------------------------------------------------------------------------
//
void CTmServerSession::ConstructL()
    {
    iServer.IncrementSessions();
    User::LeaveIfError(iFs.Connect());
    // Set session to private (files will be stored in the private data cage).
    User::LeaveIfError( iFs.CreatePrivatePath( EDriveC ) );
    User::LeaveIfError( iFs.SetSessionToPrivate( EDriveC ) );
    }

// ----------------------------------------------------------------------------
// CTmServerSession::CTmServerSession()
// C++ default constructor can NOT contain any code, that might leave.
// ----------------------------------------------------------------------------
//
CTmServerSession::CTmServerSession(CTmServer& aServer): iServer( aServer )
    {
    }

// ----------------------------------------------------------------------------
// CTmServerSession::~CTmServerSession()
// Destructor.
// ----------------------------------------------------------------------------
//
CTmServerSession::~CTmServerSession()
    {
    iFs.Close();
    iServer.DecrementSessions();
    }

// ----------------------------------------------------------------------------
// CTmServerSession::ServiceL()
// Service request from client.
// ----------------------------------------------------------------------------
//
//void CTmServerSession::ServiceL( const RMessage& aMessage )
void CTmServerSession::ServiceL( const RMessage2& aMessage )
    {
    iClientMsg = aMessage;
    switch ( aMessage.Function() )
        {
        case ETmServRequestAddress :
            RequestAddressL();
            break;
            
        case ETmServSetAddress :
            SetAddressL();
            break;

        case ETmServRequestPort :
            RequestPortL();
            break;
            
        case ETmServSetPort :
            SetPortL();
            break;

        case ETmServRequestType :
            RequestTypeL();
            break;
            
        case ETmServSetType :
            SetTypeL();
            break;

        case ETmServRequestAll :
            RequestAllL();
            break;

        case ETmServSetAll :
            SetAllL();
            break;

        default:
            PanicClient( EBadRequest );
            break;
        }
    aMessage.Complete( KErrNone );
    }

// ----------------------------------------------------------------------------
// CTmServerSession::RequestAddressL()
// Called as a result of the client requesting the server address.
// ----------------------------------------------------------------------------
//
void CTmServerSession::RequestAddressL()
    {
    ReadFileL(0, KAddressFileName);
    }
    
// ----------------------------------------------------------------------------
// CTmServerSession::SetAddressL()
// Called as a result of the client requesting to set the server address.
// ----------------------------------------------------------------------------
//
void CTmServerSession::SetAddressL()
    {
    WriteFileL(0, KAddressFileName);
    }

// ----------------------------------------------------------------------------
// CTmServerSession::RequestPortL()
// Called as a result of the client requesting the server port.
// ----------------------------------------------------------------------------
//

void CTmServerSession::RequestPortL()
    {
    ReadFileL(0, KPortFileName);
    }
    
// ----------------------------------------------------------------------------
// CTmServerSession::SetPortL()
// Called as a result of the client requesting to set the server port.
// ----------------------------------------------------------------------------
//

void CTmServerSession::SetPortL()
    {
    WriteFileL(0, KPortFileName);
    }

// ----------------------------------------------------------------------------
// CTmServerSession::RequestTypeL()
// Called as a result of the client requesting the server type.
// ----------------------------------------------------------------------------
//

void CTmServerSession::RequestTypeL()
    {
    ReadFileL(0, KTypeFileName);
    }
    
// ----------------------------------------------------------------------------
// CTmServerSession::SetTypeL()
// Called as a result of the client requesting to set the server type.
// ----------------------------------------------------------------------------
//

void CTmServerSession::SetTypeL()
    {
    WriteFileL(0, KTypeFileName);
    }

// ----------------------------------------------------------------------------
// CTmServerSession::RequestAllL()
// Called as a result of the client requesting the server address, port 
// and type.
// ----------------------------------------------------------------------------
//

void CTmServerSession::RequestAllL()
    {
    ReadFileL(0, KAddressFileName);
    ReadFileL(1, KPortFileName);
    ReadFileL(2, KTypeFileName);
    }
    
// ----------------------------------------------------------------------------
// CTmServerSession::SetAllL()
// Called as a result of the client requesting to set the server address, port
// and type.
// ----------------------------------------------------------------------------
//

void CTmServerSession::SetAllL()
    {
    WriteFileL(0, KAddressFileName);
    WriteFileL(1, KPortFileName);
    WriteFileL(2, KTypeFileName);    
    }


// ----------------------------------------------------------------------------
// CTmServerSession::WriteFileL()
// Encrypts the given descriptor and writes it to a file with the given file 
// name
// ----------------------------------------------------------------------------
//
void CTmServerSession::WriteFileL( TInt aMsgIndex, const TDesC& aFileName )
	{
    // An RBuf could also be used here (as an instance variable) instead of a 
    // TBuf, in which case the client's message could be of arbitrary length.
    if (iClientMsg.GetDesLength(aMsgIndex) > KTmMaxClientDescriptorLength)
        {
        iClientMsg.Panic(KTMExampleServer, KErrBadDescriptor);
        }
        
    TBuf<KTmMaxClientDescriptorLength> contents;
    TRAPD(err2, iClientMsg.ReadL(aMsgIndex, contents));
    if (err2 != KErrNone)
        {
        iClientMsg.Panic(KTMExampleServer, KErrBadDescriptor);            
        }
	
    RFileWriteStream writeStream;
    writeStream.PushL();

    TInt err = writeStream.Replace(iFs, aFileName, EFileWrite);
  	if (err == KErrNone) 
		{
        writeStream << contents;
        writeStream.CommitL();
		}

    writeStream.Pop();
    writeStream.Release();
	}

// ----------------------------------------------------------------------------
// CTmServerSession::ReadFileL()
// Reads and decrypts a descriptor found in a file with the given file name. 
// The decrypted descriptor is written to the client's address space via 
// aClientsDescriptor.
// ----------------------------------------------------------------------------
//
void CTmServerSession::ReadFileL( TInt aMsgIndex, const TDesC& aFileName )
    {
    RFileReadStream readStream;
    readStream.PushL();

    TInt err = readStream.Open(iFs, aFileName, EFileRead);
  	if (err == KErrNone) 
		{
        TBuf<KTmMaxClientDescriptorLength> temp;
        readStream >> temp;
        iClientMsg.WriteL( aMsgIndex, temp );
		}
	else
		{
  		// Opening read stream failed, write a dummy string to client's address space
        iClientMsg.WriteL(aMsgIndex, KEmpty);
		}

    readStream.Pop();
    readStream.Release();
	}

// -----------------------------------------------------------------------------
// CTmServerSession::PanicClient()
// Causes the client thread to panic.
// -----------------------------------------------------------------------------
//
void CTmServerSession::PanicClient( TInt aPanic ) const
    {
    // Note: this panics the client thread, not the server
    iClientMsg.Panic( KTMExampleServer,aPanic ); 
    }
// End of File