Initial checkin of PortQueue class

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3036 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kits/app/PortQueue.cpp

@@ -0,0 +1,205 @@
+//------------------------------------------------------------------------------
+//	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:		PortQueue.cpp
+//	Author:			DarkWyrm <bpmagic@columbus.rr.com>
+//	Description:	Facilitation class for reading and queueing messages from ports
+//  
+//------------------------------------------------------------------------------
+#include "PortQueue.h"
+
+PortMessage::PortMessage(const int32 &code, const void *buffer, const ssize_t &buffersize,
+		const bool &copy)
+{
+	_code=code;
+	SetBuffer(buffer,buffersize,copy);
+}
+
+PortMessage::PortMessage(void)
+{
+	_code=0;
+	_buffer=NULL;
+	_buffersize=0;
+}
+
+PortMessage::~PortMessage(void)
+{
+	if(_buffersize>0 && _buffer!=NULL)
+		delete _buffer;
+}
+
+
+status_t PortMessage::ReadFromPort(const port_id &port, const bigtime_t &timeout=B_INFINITE_TIMEOUT)
+{
+	if(_buffersize>0 && _buffer!=NULL)
+		delete _buffer;
+	_buffer=NULL;
+	_buffersize=0;
+
+	if(timeout==B_INFINITE_TIMEOUT)
+	{
+		_buffersize=port_buffer_size(port);
+		if(_buffersize==B_BAD_PORT_ID)
+			return (status_t)_buffersize;
+
+		if(_buffersize>0)
+			_buffer=new char[_buffersize];
+		read_port(port, &_code, _buffer, _buffersize);
+	}
+	else
+	{
+		_buffersize=port_buffer_size_etc(port,B_TIMEOUT, timeout);
+		if(_buffersize==B_TIMED_OUT || _buffersize==B_BAD_PORT_ID || 
+				_buffersize==B_WOULD_BLOCK)
+			return (status_t)_buffersize;
+			
+		if(_buffersize>0)
+			_buffer=new char[_buffersize];
+		read_port(port, &_code, _buffer, _buffersize);
+	}
+	
+	return B_OK;
+}
+
+status_t PortMessage::WriteToPort(const port_id &port)
+{
+	// Check port validity
+	port_info pi;
+	if(get_port_info(port,&pi)!=B_OK)
+		return B_BAD_VALUE;
+	
+	write_port(port,_code, _buffer, _buffersize);
+	
+	if(_buffer && _buffersize>0)
+	{
+		delete _buffer;
+		_buffersize=0;
+		_buffer=NULL;
+	}
+	return B_OK;
+}
+	
+void PortMessage::SetCode(const int32 &code)
+{
+	_code=code;
+}
+
+void PortMessage::SetBuffer(const void *buffer, const ssize_t &size, const bool &copy)
+{
+	if(_buffersize>0 && _buffer!=NULL)
+		delete _buffer;
+	_buffer=NULL;
+	_buffersize=0;
+
+	if(!buffer || size<1)
+		return;
+
+	if(copy)
+	{
+		_buffersize=size;
+		_buffer=new char[_buffersize];
+		memcpy(_buffer,buffer,_buffersize);
+	}
+	else
+	{
+		_buffersize=size;
+		_buffer=(void *)buffer;
+	}
+}
+
+
+PortQueue::PortQueue(const port_id &port)
+{
+	port_info pi;
+	_init=(get_port_info(port,&pi)==B_OK)?true:false;
+	_port=port;
+}
+
+PortQueue::~PortQueue(void)
+{
+	MakeEmpty();
+}
+
+bool PortQueue::SetPort(const port_id &port)
+{
+	port_info pi;
+	_init=(get_port_info(port,&pi)==B_OK)?true:false;
+	_port=port;
+
+	return _init;
+}
+
+void PortQueue::GetMessagesFromPort(bool wait_for_messages=false)
+{
+	if(_init)
+	{
+		PortMessage *msg;
+		ssize_t size;
+		port_info pi;
+		get_port_info(_port, &pi);
+		status_t stat;
+
+		if(pi.queue_count==0 && wait_for_messages)
+		{
+			size=port_buffer_size(_port);
+			// now that there is a message, we'll just fall through to the
+			// port-emptying loop
+			get_port_info(_port, &pi);
+		}
+		
+		for(int32 i=0; i<pi.queue_count; i++)
+		{
+			msg=new PortMessage();
+			stat=msg->ReadFromPort(_port,0);
+			
+			if(stat!=B_OK)
+			{
+				delete msg;
+				break;
+			}
+			
+			_q.push(msg);
+		}
+		
+	}
+}
+
+PortMessage *PortQueue::GetMessageFromQueue(void)
+{
+	if(_q.empty())
+		return NULL;
+
+	PortMessage *msg=_q.front();
+	_q.pop();
+	return msg;
+}
+
+void PortQueue::MakeEmpty(void)
+{
+	PortMessage *msg;
+	while(!_q.empty())
+	{
+		msg=_q.front();
+		_q.pop();
+		delete msg;
+	}
+}
+

src/kits/app/app.src

@@ -21,6 +21,7 @@ APP_KIT_SOURCE =
 	MessageUtils.cpp
 	PropertyInfo.cpp
 	PortLink.cpp
+	PortQueue.cpp
 	RegistrarDefs.cpp
 	RegistrarThread.cpp
 	RegistrarThreadManager.cpp