Renew the updater branch

Now with some actual consensus on what the updater will do!

mmc_updater/src/UpdateDialogGtkFactory.cpp

@@ -0,0 +1,59 @@
+#include "UpdateDialogGtkFactory.h"
+
+#include "Log.h"
+#include "UpdateDialog.h"
+#include "StringUtils.h"
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+class UpdateDialogGtk;
+
+// GTK updater UI library embedded into
+// the updater binary
+extern unsigned char libupdatergtk_so[];
+extern unsigned int libupdatergtk_so_len;
+
+// pointers to helper functions in the GTK updater UI library
+UpdateDialogGtk* (*update_dialog_gtk_new)() = 0;
+
+bool extractFileFromBinary(const char* path, const void* buffer, size_t length)
+{
+	int fd = open(path,O_CREAT | O_WRONLY | O_TRUNC,0755);
+	size_t count = write(fd,buffer,length);
+	if (fd < 0 || count < length)
+	{
+		if (fd >= 0)
+		{
+			close(fd);
+		}
+		return false;
+	}
+	close(fd);
+	return true;
+}
+
+UpdateDialog* UpdateDialogGtkFactory::createDialog()
+{
+	const char* libPath = "/tmp/libupdatergtk.so";
+
+	if (!extractFileFromBinary(libPath,libupdatergtk_so,libupdatergtk_so_len))
+	{
+		LOG(Warn,"Failed to load the GTK UI library - " + std::string(strerror(errno)));
+		return 0;
+	}
+
+	void* gtkLib = dlopen(libPath,RTLD_LAZY);
+	if (!gtkLib)
+	{
+		LOG(Warn,"Failed to load the GTK UI - " + std::string(dlerror()));
+		return 0;
+	}
+	update_dialog_gtk_new = (UpdateDialogGtk* (*)()) dlsym(gtkLib,"update_dialog_gtk_new");
+	return reinterpret_cast<UpdateDialog*>(update_dialog_gtk_new());
+}
+