extract module from apk and load it from its filepath

[ms2-fixes] / MS2Debounce / src / de / rmdir / ms2debounce / DebounceModuleHelper.java

package de.rmdir.ms2debounce;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.File;

import android.content.Context;

public class DebounceModuleHelper
{
	private Context ctx;

	public DebounceModuleHelper(Context context) {
		ctx = context;
	}

	public void loadModule() {
		loadModule(10);
	}

	public void loadModule(int delay) {
		File debounce_ko = new File(ctx.getFilesDir() + "/debounce.ko");

		extractModule();

		// FIXME: Read settings from database...

		try {
			Process insmod = Runtime.getRuntime().exec(new String[]{"su","-c","/system/bin/insmod " + debounce_ko + " debounce_delay=" + delay});
			insmod.waitFor();
		} catch (Exception e) {}
	}

	public void unloadModule() {
		try {
			Process rmmod = Runtime.getRuntime().exec(new String[]{"su","-c","/system/bin/rmmod debounce"});
			rmmod.waitFor();
		} catch (Exception e) {}
	}

	public boolean isLoaded() {
		return false;
	}

	private synchronized void extractModule() {
		File debounce_ko = new File(ctx.getFilesDir() + "/debounce.ko");

		if (debounce_ko.exists()) {
			return;
		}

		try {
			InputStream apk = ctx.getAssets().open("debounce.ko");
			OutputStream mod = ctx.openFileOutput("debounce.ko.tmp", 0);

			//I assume a page is 4k...
			byte buf[] = new byte[4096];
			int bytes;

			while((bytes = apk.read(buf)) != -1) {
				mod.write(buf, 0, bytes);
			}

			apk.close();
			mod.close();

			File tmpfile = new File(debounce_ko + ".tmp");
			tmpfile.renameTo(debounce_ko);
		} catch (Exception e) {}
	}
}