barrier/src/lib/platform/MSWindowsHook.cpp

/*
 * synergy -- mouse and keyboard sharing utility
 * Copyright (C) 2012-2016 Symless Ltd.
 * Copyright (C) 2011 Chris Schoeneman
 * 
 * This package is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * found in the file LICENSE that should have accompanied this file.
 * 
 * This package is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "platform/MSWindowsHook.h"

#include "synergy/XScreen.h"
#include "base/Log.h"

static const char* g_name = "synwinhk";

MSWindowsHook::MSWindowsHook() :
	m_initFunc(NULL),
	m_cleanupFunc(NULL),
	m_setSidesFunc(NULL),
	m_setZoneFunc(NULL),
	m_setModeFunc(NULL),
	m_instance(NULL)
{
}

MSWindowsHook::~MSWindowsHook()
{
	cleanup();

	if (m_instance != NULL) {
		FreeLibrary(m_instance);
	}
}

void
MSWindowsHook::loadLibrary()
{
	// load library
	m_instance = LoadLibrary(g_name);
	if (m_instance == NULL) {
		LOG((CLOG_ERR "failed to load hook library, %s.dll is missing or invalid", g_name));
		throw XScreenOpenFailure();
	}

	// look up functions
	m_setSidesFunc = (SetSidesFunc)GetProcAddress(m_instance, "setSides");
	m_setZoneFunc = (SetZoneFunc)GetProcAddress(m_instance, "setZone");
	m_setModeFunc = (SetModeFunc)GetProcAddress(m_instance, "setMode");
	m_initFunc = (InitFunc)GetProcAddress(m_instance, "init");
	m_cleanupFunc = (CleanupFunc)GetProcAddress(m_instance, "cleanup");

	if (m_setSidesFunc == NULL ||
		m_setZoneFunc == NULL ||
		m_setModeFunc == NULL ||
		m_initFunc == NULL ||
		m_cleanupFunc == NULL) {
		LOG((CLOG_ERR "failed to load hook function, %s.dll could be out of date", g_name));
		throw XScreenOpenFailure();
	}

	// initialize library
	if (init(GetCurrentThreadId()) == 0) {
		LOG((CLOG_ERR "failed to init %s.dll, another program may be using it", g_name));
		LOG((CLOG_INFO "restarting your computer may solve this error"));
		throw XScreenOpenFailure();
	}
}

HINSTANCE
MSWindowsHook::getInstance() const
{
	return m_instance;
}

int
MSWindowsHook::init(DWORD threadID)
{
	if (m_initFunc == NULL) {
		return NULL;
	}
	return m_initFunc(threadID);
}

int
MSWindowsHook::cleanup()
{
	if (m_cleanupFunc == NULL) {
		return NULL;
	}
	return m_cleanupFunc();
}

void
MSWindowsHook::setSides(UInt32 sides)
{
	if (m_setSidesFunc == NULL) {
		return;
	}
	m_setSidesFunc(sides);
}

void
MSWindowsHook::setZone(SInt32 x, SInt32 y, SInt32 w, SInt32 h, SInt32 jumpZoneSize)
{
	if (m_setZoneFunc == NULL) {
		return;
	}
	m_setZoneFunc(x, y, w, h, jumpZoneSize);
}

void
MSWindowsHook::setMode(EHookMode mode)
{
	if (m_setModeFunc == NULL) {
		return;
	}
	m_setModeFunc(mode);
}