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/**
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This file is part of CWRT package **
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Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). **
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU (Lesser) General Public License as
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published by the Free Software Foundation, version 2.1 of the License.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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(Lesser) General Public License for more details. You should have
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received a copy of the GNU (Lesser) General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QByteArray>
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#include "serviceipclocalsocket_p.h"
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namespace WRT
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{
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// CONSTANTS
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const char* REQUEST_COMPLETE_TOKEN = ";ROK";
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const int REQUEST_COMPLETE_TOKEN_LENGTH = 4;
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const char REQUEST_DELIMITER_TOKEN = ';';
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/*!
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\class ServiceLocalSocketIPC
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QLocalSocket based IPC client-side backend
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*/
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/*!
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Constructor
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*/
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ServiceLocalSocketIPC::ServiceLocalSocketIPC() : m_BufferType( ENoBuffer )
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{
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m_Socket = new QLocalSocket();
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QObject::connect(m_Socket, SIGNAL( error( QLocalSocket::LocalSocketError ) ),
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this, SLOT( handleError( QLocalSocket::LocalSocketError ) ) );
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}
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/*!
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Destructor
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*/
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ServiceLocalSocketIPC::~ServiceLocalSocketIPC()
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{
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delete m_Socket;
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}
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/*!
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Connect to the server
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@param aServerName name of the server to connect to
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@return true if connected, false otherwise
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*/
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bool ServiceLocalSocketIPC::connect(const QString& aServerName)
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{
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bool rtn;
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m_Socket->connectToServer(aServerName);
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rtn = m_Socket->waitForConnected();
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return rtn;
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}
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/*!
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Disconnect from the server
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*/
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void ServiceLocalSocketIPC::disconnect()
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{
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m_Socket->close();
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}
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/*!
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Starts the service
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@param aServerName name of the server to connect to
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@param aExeName name of the server executable
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@return true if server started, false otherwise
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*/
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bool ServiceLocalSocketIPC::startServer(const QString& aServerName,
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const QString& aExeName)
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{
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bool started(true);
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//Semaphore with 1 initial count,
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//Use system semaphore to ensure no contention exists across multiple processes
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//According to QT documentation for System Semaphores on Windows,
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//the semaphore is automatically cleaned up if a process crashes, thus preventing deadlock
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//
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QSystemSemaphore funcSem(aServerName + FUNCTIONSEM, 1);
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funcSem.acquire();
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// Shared chunk to check if the server has been started or not
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QSharedMemory sharedMem(aServerName);
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char* data(NULL);
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bool attached = sharedMem.attach();
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if (attached) {
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data = (char*) sharedMem.data();
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}
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// Shared memory not created or the flag was not set properly
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if (!attached || strcmp(data, SERVERNOTSTARTED) == 0) {
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// Create the server wait semaphore. When the server has listened,
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// it will signaled after listen has started
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//
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QSystemSemaphore sem(aServerName + SERVERSEM, 0);
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// Start the server, since this function is mutex'ed by the global semaphore
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// only 1 process/thread can reach here
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//
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started = QProcess::startDetached(aExeName);
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// Wait until the server signals
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if (started) {
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sem.acquire();
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}
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}
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// Test if server started successfully
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#if _DEBUG
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attached = sharedMem.attach();
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if( attached )
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{
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data = (char*)sharedMem.data();
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if( strcmp( data, SERVERSTARTED ) == 0 )
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{
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qDebug() << "Server Started Successfully";
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}
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}
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#endif // _DEBUG
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// Free shared memory
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sharedMem.detach();
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// Release the function semaphore
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funcSem.release(1);
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return started;
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}
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/*!
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Send a request synchronously
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@param aRequestType type of request, toAscii() will be called to serialize the data
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@param aData aData data to send to the server
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@return true if data is sent, false otherwise
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*/
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bool ServiceLocalSocketIPC::sendSync(const QString& aRequestType,
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const QByteArray& aData)
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{
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QByteArray data;
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data.setNum(aData.length());
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data.append(REQUEST_DELIMITER_TOKEN);
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data.append(aRequestType.toAscii());
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data.append(REQUEST_DELIMITER_TOKEN);
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data.append(aData);
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int count = m_Socket->write(data);
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m_Socket->flush();
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m_BufferType = ESyncBuffer;
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return (count > 0);
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}
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/*!
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Send a request asynchronously
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@param aRequestType type of request, toAscii() will be called to serialize the data
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@param aData data to send to the server
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*/
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void ServiceLocalSocketIPC::sendAsync(const QString& aRequestType,
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const QByteArray& aData)
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{
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QByteArray data;
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data.setNum(aData.length());
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data.append(REQUEST_DELIMITER_TOKEN);
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data.append(aRequestType.toAscii());
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data.append(REQUEST_DELIMITER_TOKEN);
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data.append(aData);
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m_Socket->write(data);
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// Connect the signal and reset aync data buffer
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m_AsyncData.clear();
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QObject::connect(m_Socket, SIGNAL( readyRead() ),
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this, SLOT( handleReadyRead() ) );
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m_BufferType = EAsyncBuffer;
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}
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/*!
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Reads all data pending in the buffer
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@return QByteArray data that has been read
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*/
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QByteArray ServiceLocalSocketIPC::readAll()
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{
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QByteArray result;
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// If asynchronous read all data from the socket
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//
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if ( m_BufferType == ESyncBuffer ) {
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// Wait for all data to be completed before returning
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//
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bool done = false;
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do {
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result.append(m_Socket->readAll());
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if (result.right(REQUEST_COMPLETE_TOKEN_LENGTH)
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== REQUEST_COMPLETE_TOKEN) {
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// Chop the end token
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result.chop(REQUEST_COMPLETE_TOKEN_LENGTH);
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done = true;
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}
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} while (done == false);
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}
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// If async, return the internal databuffer
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else if( m_BufferType == EAsyncBuffer ){
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// Should be just a d-ptr copy
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result = m_AsyncData;
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QObject::disconnect(m_Socket, SIGNAL( readyRead() ),
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this, SLOT( handleReadyRead() ) );
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}
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m_BufferType = ENoBuffer;
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return result;
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}
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/*!
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Waits until data is available for reading
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@return bool true if data can be read
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*/
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bool ServiceLocalSocketIPC::waitForRead()
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{
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return m_Socket->waitForReadyRead();
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}
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/*!
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Handle any socket errors
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@param socketError error
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*/
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void ServiceLocalSocketIPC::handleError(QLocalSocket::LocalSocketError aSocketError)
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{
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// Use base class to send this
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emitError(doMapErrors(aSocketError));
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}
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/*!
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Handle when data is ready to be read
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*/
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void ServiceLocalSocketIPC::handleReadyRead()
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{
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m_AsyncData.append(m_Socket->readAll());
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if (m_AsyncData.right(REQUEST_COMPLETE_TOKEN_LENGTH)
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== REQUEST_COMPLETE_TOKEN) {
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// Chop the end token
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m_AsyncData.chop(REQUEST_COMPLETE_TOKEN_LENGTH);
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// Use base class to send signal when all the data has been assembled
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emitReadyRead();
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}
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}
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int ServiceLocalSocketIPC::doMapErrors( int aError )
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{
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int error(0);
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// Map QT Local Socket error codes to custom error codes
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//
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switch( aError ) {
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case QLocalSocket::ConnectionError:
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case QLocalSocket::ConnectionRefusedError: {
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error = ServiceFwIPC::EConnectionError;
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break;
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}
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case QLocalSocket::PeerClosedError: {
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error = ServiceFwIPC::EConnectionClosed;
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break;
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}
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case QLocalSocket::ServerNotFoundError: {
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error = ServiceFwIPC::EServerNotFound;
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break;
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}
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case QLocalSocket::SocketAccessError:
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case QLocalSocket::SocketResourceError:
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case QLocalSocket::SocketTimeoutError:
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case QLocalSocket::DatagramTooLargeError:
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case QLocalSocket::UnsupportedSocketOperationError: {
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error = ServiceFwIPC::EIPCError;
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break;
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}
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case QLocalSocket::UnknownSocketError: {
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error = ServiceFwIPC::EUnknownError;
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break;
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}
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}
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return error;
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}
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}
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// END OF FILE
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