aRts audio server
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/*
Copyright (C) 1997 Mark Donohoe (donohoe@kde.org)
Copyright (C) 2000 Stefan Westerfeld (stefan@space.twc.de)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/*
* This is based on Mark Donohoe's nice KRootProp class (found in
* tdelibs/tdecore/krootprop.cpp). I couldn't use KRootProp directly, since
* I wanted aRts (and even it's X11 support) to work without KDE and/or Qt
* installed at all.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include "x11globalcomm.h"
#include "debug.h"
#include <iostream>
using namespace std;
using namespace Arts;
class X11GlobalComm_impl : virtual public X11GlobalComm_skel {
protected:
Display *X11display;
Window rootWin;
Atom atom;
map<string,string> propertyMap;
bool init;
void warn(const char *what)
{
arts_warning("X11GlobalComm: %s", what);
}
public:
X11GlobalComm_impl() :rootWin(0), atom(0)
{
X11display = XOpenDisplay(NULL);
if(!X11display)
{
warn("Can't connect to the XServer - Initial references won't work.");
init = false;
}
else
{
rootWin = DefaultRootWindow(X11display);
atom = XInternAtom( X11display, "MCOPGLOBALS" , False);
init = true;
}
}
~X11GlobalComm_impl()
{
if(X11display)
XCloseDisplay(X11display);
}
void read()
{
if(!init) return;
Atom type;
int format;
unsigned long nitems;
unsigned long bytes_after;
long offset;
unsigned char *buf;
propertyMap.clear();
// If a property has already been opened write
// the dictionary back to the root window
string s;
offset = 0; bytes_after = 1;
while (bytes_after != 0)
{
XGetWindowProperty( X11display, rootWin, atom, offset, 256,
False, XA_STRING, &type, &format, &nitems, &bytes_after,
&buf);
if(type == None) // no property -> no contents
return;
s += (char*) buf;
offset += nitems/4;
if (buf)
XFree((char*) buf);
}
// Parse through the property string stripping out key value pairs
// and putting them in the dictionary
while(s.length() >0 )
{
// parse the string for first key-value pair separator '\n'
int i = s.find("\n",0);
// extract the key-values pair and remove from string
string keypair = s.substr(0,i);
s = s.substr(i+1,s.size()-(i+1));
// split key and value and add to dictionary
i = keypair.find( "=" );
if( i != -1 )
{
string key = keypair.substr( 0, i );
string value = keypair.substr( i+1, keypair.size()-(i+1) );
propertyMap[key] = value;
}
}
}
void write()
{
if(!init) return;
// bring map in the variable=value form with \n as seperator
string propString;
map<string,string>::iterator i = propertyMap.begin();
for(i = propertyMap.begin(); i != propertyMap.end(); i++)
propString += i->first + "=" + i->second + "\n";
// send to the X11 server
XChangeProperty( X11display, rootWin, atom,
XA_STRING, 8, PropModeReplace,
(const unsigned char *)propString.c_str(),
propString.size()+1);
XFlush(X11display);
}
bool put(const string& variable, const string& value)
{
if(!init) return false;
read();
if(propertyMap[variable].empty())
{
propertyMap[variable] = value;
write();
return true;
}
return false;
}
string get(const string& variable)
{
if(!init) return "";
read();
return propertyMap[variable];
}
void erase(const string& variable)
{
if(!init) return;
read();
propertyMap.erase(variable);
write();
}
};
REGISTER_IMPLEMENTATION(X11GlobalComm_impl);