haiku-beta6/src/kits/app/PortLink.cpp

//------------------------------------------------------------------------------
//	Copyright (c) 2001-2002, OpenBeOS
//
//	Permission is hereby granted, free of charge, to any person obtaining a
//	copy of this software and associated documentation files (the "Software"),
//	to deal in the Software without restriction, including without limitation
//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
//	and/or sell copies of the Software, and to permit persons to whom the
//	Software is furnished to do so, subject to the following conditions:
//
//	The above copyright notice and this permission notice shall be included in
//	all copies or substantial portions of the Software.
//
//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//	DEALINGS IN THE SOFTWARE.
//
//	File Name:		PortLink.cpp
//	Author:			DarkWyrm <[email protected]>
//	Description:	Class for low-overhead packet-style port-based messaging
//  
//------------------------------------------------------------------------------
#include <stdlib.h>

#include <ServerProtocol.h>
#include "PortLink.h"
#include "PortMessage.h"

PortLink::PortLink(port_id port)
{
	port_info pi;
	fPortValid			= (get_port_info(port, &pi)==B_OK)? true: false;

	fSendPort		= port;
	fReceivePort	= create_port(30,"PortLink reply port");	

	fSendCode		= 0;
	fSendBuffer		= new char[SESSION_BUFFER_SIZE * 4];
	fSendPosition	= 8;
	fDataSize		= (int32*)(fSendBuffer+sizeof(int32));
	*fDataSize		= 0;
}

PortLink::PortLink( const PortLink &link )
{
	fPortValid			= link.fPortValid;

	fSendPort		= link.fSendPort;
	fReceivePort	= create_port(30,"PortLink reply port");
	
	fSendCode		= 0;
	fSendBuffer		= new char[SESSION_BUFFER_SIZE * 4];
	fSendPosition	= 8;
	fDataSize		= (int32*)(fSendBuffer+sizeof(int32));
	*fDataSize		= 0;
}

PortLink::~PortLink(void)
{
	delete [] fSendBuffer;
}

void PortLink::SetOpCode( int32 code )
{
	fSendCode=code;
	int32 *cast=(int32*)fSendBuffer;
	*cast=code;
}

void PortLink::SetPort( port_id port )
{
	port_info pi;
	
	fSendPort=port;
	fPortValid=(get_port_info(port, &pi) == B_OK)? true: false;
}

port_id PortLink::GetPort()
{
	return fSendPort;
}

status_t PortLink::Flush(bigtime_t timeout)
{
	status_t	write_stat;
	
	if(!fPortValid)
		return B_BAD_VALUE;
	
	if(timeout!=B_INFINITE_TIMEOUT)
		write_stat=write_port_etc(fSendPort, AS_SERVER_PORTLINK, fSendBuffer,
									fSendPosition, B_TIMEOUT, timeout);
	else
		write_stat=write_port(fSendPort, AS_SERVER_PORTLINK, fSendBuffer, fSendPosition);
	
	fSendPosition=8;
	*fDataSize=0;

	return write_stat;
}

status_t PortLink::FlushWithReply( PortMessage *msg,bigtime_t timeout )
{
	if(!fPortValid || !msg)
		return B_BAD_VALUE;

	// attach our reply port_id at the end
	Attach<int32>(fReceivePort);

	// Flush the thing....FOOSH! :P
	write_port(fSendPort, AS_SERVER_PORTLINK, fSendBuffer, fSendPosition);
	fSendPosition	= 8;
	*fDataSize=0;
	
	// Now we wait for the reply
	msg->ReadFromPort(fReceivePort,timeout);
	
	return B_OK;
}

// Deprecated compatibility hack added to allow PortLink to send messages in a fashion
// like BSession. This was because originally there were differences in how they sent
// messages across ports. This is no longer the case, so this call should never need to be
// made. It remains only until current calls to it can be removed.
status_t PortLink::FlushToSession()
{
	BSession ses(0, fSendPort);
	ses.CopyToSendBuffer(fSendBuffer, fSendPosition - 8);
	ses.Sync();
	return B_OK;
}

status_t PortLink::Attach(const void *data, size_t size)
{
	if (size <= 0)
		return B_ERROR;
  
	if (SESSION_BUFFER_SIZE - fSendPosition > (int32)size)
	{
		memcpy(fSendBuffer + fSendPosition, data, size);
		fSendPosition += size;
		*fDataSize+=size;
		return B_OK;
	}
	return B_NO_MEMORY;
}

status_t PortLink::AttachString(const char *string)
{
	int16 len = (int16)strlen(string)+1;

	Attach<int16>(len);
	return Attach(string, len);
}

void PortLink::MakeEmpty()
{
	fSendPosition=8;
	*fDataSize=0;
}