Tydus

HOWTO Cross compiling on Android

5W1H

What is NDK

NDK (Native Develop Toolkit) is a toolchain from Android official, originally for users who writes native C/C++ code as JNI library. It's not designed for compiling standalone programs (./a.out) and not compatible with automake/cmake etc.

What is Standalone Toolchain

"Standalone" refers to two meanings:

The program is standalone (has nothing connect to NDK, and don't need helper scripts to run it)
The toolchain is made for building standalone programs and libs, and which can used by automake etc.

(Optional) Why NDK is hard to use

By default, NDK uses android flavor directory structure when it's finding headers and libs, which is different from GNU flavor, so the compiler cannot find them. For Example:

How to root Nexus 7

What is Rooting

Android has a "jail" that limits user apps to claim its own user and group (one Linux user for one app). The default '/bin/su' program denies the access from these user apps. Thus we need to replace the default su by some 3rd party ones to get root access from apps(as well as adb). That is 'rooting'.

What is unlock

Many manufacturers don't like user to change their system (/, /system, etc.), so they employed a technique called 'BootLoader Lock' which will deny any unauthorized changes to the system partitions. Literally, the "Unlock" procedure will nullify the lock (by some means, be it official or exploiting). As we want to replace the 'su', we first need to unlock the machine.

What is recovery

Recovery is a small, in-memory Linux, which is designed for 'emergency' use (e.g. the main Android system broke down and cannot boot up). Many developers try to make use of the Recovery system, mainly for flashing custom roms, backing up and debugging. Therefore, we ne

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	if(typeof CCSE == 'undefined') Game.LoadMod('https://klattmose.github.io/CookieClicker/' + (0 ? 'Beta/' : '') + 'CCSE.js');
	FortuneCookie.name = 'Fortune Cookie';
	FortuneCookie.version = '2.17';
	FortuneCookie.GameVersion = '2.022';

	FortuneCookie.launch = function(){
	FortuneCookie.init = function(){
	FortuneCookie.isLoaded = 1;

	/**********
	* Header *
	**********/

	CM = {};

	CM.Backup = {};

	CM.Cache = {};

	#!/bin/sh

	# ifrename.sh: rename ethx and wlanx to persistent names
	# Dependency: ip ethtool
	# See also: https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c
	# TODO: currently only support pci-e devices

	ip -br l \| cut -d' ' -f1 \| while read i; do

	prefix=$(echo "$i" \| cut -c-2)

	#!/bin/sh

	#=======================================
	# config_vwifi.sh
	# Config virtual wi-fi (bridge to vlans)
	#=======================================

	# show which port you have by `robocfg show'
	PORT_LIST="0t 1t 2t 3t 4t 8t"

	from tensorflow.examples.tutorials.mnist import input_data
	mnist = input_data.read_data_sets('MNIST_data', one_hot=True)

	import tensorflow as tf
	sess = tf.InteractiveSession()

	weight_variable = lambda shape: tf.Variable(tf.truncated_normal(shape, stddev=0.1))
	bias_variable = lambda shape: tf.Variable(tf.constant(0.1, shape=shape))

	conv2d = lambda x, W: tf.nn.conv2d(x, W, strides=[1, 1, 1, 1], padding='SAME')

	import json, sys, numpy as np
	from scipy import misc, signal
	from PIL import Image
	infile, outfile, modelpath = sys.argv[1:]
	model = json.load(open(modelpath))
	im = Image.open(infile).convert("YCbCr")
	im = misc.fromimage(im.resize((2im.size[0], 2im.size[1]), resample=Image.NEAREST)).astype("float32")
	planes = [np.pad(im[:,:,0], len(model), "edge") / 255.0]
	for step in model:
	o_planes = [sum([signal.convolve2d(ip, np.float32(kernel), "valid")

	#!/usr/bin/python2

	import sys
	import json
	import urllib2
	import lxml.html

	def fetch(url):
	ua = "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:33.0) Gecko/20100101 Firefox/33.0.2"
	return urllib2.urlopen(urllib2.Request(

	import System;
	import System.Windows.Forms;
	import Fiddler;

	// INTRODUCTION
	// This is the FiddlerScript Rules file, which creates some of the menu commands and
	// other features of Fiddler. You can edit this file to modify or add new commands.
	//
	// The original version of this file is named SampleRules.js and it is in the
	// \Program Files\Fiddler\ folder. When Fiddler first starts, it creates a copy named