#!/bin/bash
# Written by Levente Farkas <lfarkas@lfarkas.org> 2009
#
# Simple script to decode a given android rom into a more readable and comparable
# format. it's has one argument the unziped rom's directory and create another 
# diretory with ".source" name and currently do the following:
# - unzip the all .apk into a new subdir
# - decode the .dex or .odex files (you can choose between dexdump or dedexer
# - decode all sqlite3 xml file into a real xml file
# - and some minor modification to easier comparable directories

if [ $# -lt 1 ]; then
	echo "Usage: $0 -noxml -dedexer <unziped rom dir>"
	echo "  the result will be placed into <unziped rom dir>.source directory"
	echo "  --noxml xml files won't be decoded"
	echo "  --dedexer dedexer will be used in stead of dexdump"
	echo "Requirements:"
	echo "http://android4me.googlecode.com/files/AXMLPrinter2.jar for xml decode"
	echo "http://dedexer.sourceforge.net/ for dedexer"
	echo "   http://sourceforge.net/projects/dedexer/files/dedexer/1.8/ddx1.8.jar/download"
	exit 1
fi

set -e 

# ---------------- Change this part if you wanna configure it ----------------
PALTFORM=1.6
# here i assume adb is in your path if not edit the line bellow
DEXDUMP=$(dirname `which adb`)/../platforms/android-$PALTFORM/tools/dexdump
DDX=~/lib/ddx.jar
AXMLPrinter=~/lib/AXMLPrinter2.jar
# ----------------------------------------------------------------------------

# $1 = xml file to decode
decode_xml() {
	FTYPE=`file -b $1`
	if [[ "$FTYPE" =~ "DBase 3" ]]; then
		java -jar $AXMLPrinter $1 > $1.decode
		mv $1.decode $1
	fi
}

# decode classes.dex
decode_dex() {
	case $DEDEXER in
		dexdump)
			# drop all positions information since it's modified by zipalign
			$DEXDUMP classes.dex | \
				egrep -v "0x.* line=" | \
				sed "s/0x31000 (SYNTHETIC VERIFIED OPTIMIZED)/0x30000 (VERIFIED OPTIMIZED)/g" > classes.dedex 
			;;
		ddx)
			java -jar $DDX -d . classes.dex
			# drop all lines information since it's modified by zipalign
			find . -name '*.ddx' -exec sed -i "s/^\.line.*/.line xxx/" {} \;
			;;
		*)
			echo "Unknown dedexer"
			exit 2
	esac
	rm classes.dex
}

# $1 = apk or jar file
decode_pkg() {
	DIR=`dirname $1`
	FILE=`basename $1`
	APPNAME=${FILE%.*}
	pushd $DIR &>/dev/null
		mkdir $APPNAME
		unzip -d $APPNAME $FILE
		[ -f $APPNAME.odex ] && mv $APPNAME.odex $APPNAME/classes.dex
		pushd $APPNAME &>/dev/null
			[ -f classes.dex ] && decode_dex
			rm -rf META-INF
			for xml in `find . -name '*.xml'`; do
				[ $XML ] && decode_xml $xml
			done
		popd &>/dev/null
	popd &>/dev/null
	rm $1
}

XML=true
DEDEXER=dexdump

while true; do
	case $1 in
		--noxml)
			XML=false
			shift
			;;
		--dedexer)
			DEDEXER=ddx
			shift
			;;
		*)
			break
			;;
	esac
done

rsync -avP --delete $1/ $1.source/
cd $1.source

for pkg in `find . -name '*.apk' -o -name '*.jar'` ; do
	decode_pkg $pkg
done

# until i find a way to decode:-(
find . -name resources.arsc -delete