/
ARSCDecoder.java
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/
ARSCDecoder.java
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/**
* Copyright 2014 Ryszard Wiśniewski <brut.alll@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package brut.androlib.res.decoder;
import android.util.TypedValue;
import brut.androlib.AndrolibException;
import brut.androlib.res.data.*;
import brut.androlib.res.data.value.*;
import brut.util.Duo;
import brut.androlib.res.data.ResTable;
import brut.util.ExtDataInput;
import com.mindprod.ledatastream.LEDataInputStream;
import java.io.*;
import java.math.BigInteger;
import java.util.*;
import java.util.logging.Logger;
import org.apache.commons.io.input.CountingInputStream;
/**
* @author Ryszard Wiśniewski <brut.alll@gmail.com>
*/
public class ARSCDecoder {
public static ARSCData decode(InputStream arscStream, boolean findFlagsOffsets, boolean keepBroken)
throws AndrolibException {
return decode(arscStream, findFlagsOffsets, keepBroken, new ResTable());
}
public static ARSCData decode(InputStream arscStream, boolean findFlagsOffsets, boolean keepBroken,
ResTable resTable)
throws AndrolibException {
try {
ARSCDecoder decoder = new ARSCDecoder(arscStream, resTable, findFlagsOffsets, keepBroken);
ResPackage[] pkgs = decoder.readTable();
return new ARSCData(pkgs, decoder.mFlagsOffsets == null
? null
: decoder.mFlagsOffsets.toArray(new FlagsOffset[0]), resTable);
} catch (IOException ex) {
throw new AndrolibException("Could not decode arsc file", ex);
}
}
private ARSCDecoder(InputStream arscStream, ResTable resTable, boolean storeFlagsOffsets, boolean keepBroken) {
if (storeFlagsOffsets) {
arscStream = mCountIn = new CountingInputStream(arscStream);
mFlagsOffsets = new ArrayList<FlagsOffset>();
} else {
mCountIn = null;
mFlagsOffsets = null;
}
mIn = new ExtDataInput(new LEDataInputStream(arscStream));
mResTable = resTable;
mKeepBroken = keepBroken;
}
private ResPackage[] readTable() throws IOException, AndrolibException {
nextChunkCheckType(Header.TYPE_TABLE);
int packageCount = mIn.readInt();
mTableStrings = StringBlock.read(mIn);
ResPackage[] packages = new ResPackage[packageCount];
nextChunk();
for (int i = 0; i < packageCount; i++) {
packages[i] = readPackage();
}
return packages;
}
private ResPackage readPackage() throws IOException, AndrolibException {
checkChunkType(Header.TYPE_PACKAGE);
int id = (byte) mIn.readInt();
if (id == 0) {
// This means we are dealing with a Library Package, we should just temporarily
// set the packageId to the next available id . This will be set at runtime regardless, but
// for Apktool's use we need a non-zero packageId.
// AOSP indicates 0x02 is next, as 0x01 is system and 0x7F is private.
id = 2;
mResTable.setSharedLibrary(true);
}
String name = mIn.readNullEndedString(128, true);
/* typeStrings */mIn.skipInt();
/* lastPublicType */mIn.skipInt();
/* keyStrings */mIn.skipInt();
/* lastPublicKey */mIn.skipInt();
mTypeNames = StringBlock.read(mIn);
mSpecNames = StringBlock.read(mIn);
mResId = id << 24;
mPkg = new ResPackage(mResTable, id, name);
nextChunk();
while (mHeader.type == Header.TYPE_LIBRARY) {
readLibraryType();
}
while (mHeader.type == Header.TYPE_TYPE) {
readType();
}
return mPkg;
}
private void readLibraryType() throws AndrolibException, IOException {
checkChunkType(Header.TYPE_LIBRARY);
int libraryCount = mIn.readInt();
int packageId;
String packageName;
for (int i = 0; i < libraryCount; i++) {
packageId = mIn.readInt();
packageName = mIn.readNullEndedString(128, true);
LOGGER.info(String.format("Decoding Shared Library (%s), pkgId: %d", packageName, packageId));
}
while(nextChunk().type == Header.TYPE_CONFIG) {
readConfig();
}
}
private ResType readType() throws AndrolibException, IOException {
checkChunkType(Header.TYPE_TYPE);
byte id = mIn.readByte();
mIn.skipBytes(3);
int entryCount = mIn.readInt();
mMissingResSpecs = new boolean[entryCount];
Arrays.fill(mMissingResSpecs, true);
if (mFlagsOffsets != null) {
mFlagsOffsets.add(new FlagsOffset(mCountIn.getCount(), entryCount));
}
/* flags */mIn.skipBytes(entryCount * 4);
mResId = (0xff000000 & mResId) | id << 16;
mType = new ResType(mTypeNames.getString(id - 1), mResTable, mPkg);
mPkg.addType(mType);
while (nextChunk().type == Header.TYPE_CONFIG) {
readConfig();
}
addMissingResSpecs();
return mType;
}
private ResConfig readConfig() throws IOException, AndrolibException {
checkChunkType(Header.TYPE_CONFIG);
/* typeId */mIn.skipInt();
int entryCount = mIn.readInt();
/* entriesStart */mIn.skipInt();
ResConfigFlags flags = readConfigFlags();
int[] entryOffsets = mIn.readIntArray(entryCount);
if (flags.isInvalid) {
String resName = mType.getName() + flags.getQualifiers();
if (mKeepBroken) {
LOGGER.warning("Invalid config flags detected: " + resName);
} else {
LOGGER.warning("Invalid config flags detected. Dropping resources: " + resName);
}
}
mConfig = flags.isInvalid && !mKeepBroken ? null : mPkg.getOrCreateConfig(flags);
for (int i = 0; i < entryOffsets.length; i++) {
if (entryOffsets[i] != -1) {
mMissingResSpecs[i] = false;
mResId = (mResId & 0xffff0000) | i;
readEntry();
}
}
return mConfig;
}
private void readEntry() throws IOException, AndrolibException {
/* size */mIn.skipBytes(2);
short flags = mIn.readShort();
int specNamesId = mIn.readInt();
ResValue value = (flags & ENTRY_FLAG_COMPLEX) == 0 ? readValue() : readComplexEntry();
if (mConfig == null) {
return;
}
ResID resId = new ResID(mResId);
ResResSpec spec;
if (mPkg.hasResSpec(resId)) {
spec = mPkg.getResSpec(resId);
} else {
spec = new ResResSpec(resId, mSpecNames.getString(specNamesId), mPkg, mType);
mPkg.addResSpec(spec);
mType.addResSpec(spec);
}
ResResource res = new ResResource(mConfig, spec, value);
mConfig.addResource(res);
spec.addResource(res);
mPkg.addResource(res);
}
private ResBagValue readComplexEntry() throws IOException,
AndrolibException {
int parent = mIn.readInt();
int count = mIn.readInt();
ResValueFactory factory = mPkg.getValueFactory();
Duo<Integer, ResScalarValue>[] items = new Duo[count];
for (int i = 0; i < count; i++) {
items[i] = new Duo<Integer, ResScalarValue>(mIn.readInt(), (ResScalarValue) readValue());
}
return factory.bagFactory(parent, items);
}
private ResValue readValue() throws IOException, AndrolibException {
/* size */mIn.skipCheckShort((short) 8);
/* zero */mIn.skipCheckByte((byte) 0);
byte type = mIn.readByte();
int data = mIn.readInt();
return type == TypedValue.TYPE_STRING
? mPkg.getValueFactory().factory(mTableStrings.getHTML(data))
: mPkg.getValueFactory().factory(type, data, null);
}
private ResConfigFlags readConfigFlags() throws IOException,
AndrolibException {
int size = mIn.readInt();
if (size < 28) {
throw new AndrolibException("Config size < 28");
}
boolean isInvalid = false;
short mcc = mIn.readShort();
short mnc = mIn.readShort();
char[] language = this.unpackLanguageOrRegion(mIn.readByte(), mIn.readByte(), 'a');
char[] country = this.unpackLanguageOrRegion(mIn.readByte(), mIn.readByte(), '0');
byte orientation = mIn.readByte();
byte touchscreen = mIn.readByte();
int density = mIn.readUnsignedShort();
byte keyboard = mIn.readByte();
byte navigation = mIn.readByte();
byte inputFlags = mIn.readByte();
/* inputPad0 */mIn.skipBytes(1);
short screenWidth = mIn.readShort();
short screenHeight = mIn.readShort();
short sdkVersion = mIn.readShort();
/* minorVersion, now must always be 0 */mIn.skipBytes(2);
byte screenLayout = 0;
byte uiMode = 0;
short smallestScreenWidthDp = 0;
if (size >= 32) {
screenLayout = mIn.readByte();
uiMode = mIn.readByte();
smallestScreenWidthDp = mIn.readShort();
}
short screenWidthDp = 0;
short screenHeightDp = 0;
if (size >= 36) {
screenWidthDp = mIn.readShort();
screenHeightDp = mIn.readShort();
}
char[] localeScript = {'\00'};
char[] localeVariant = {'\00'};
if (size >= 48) {
localeScript = this.readScriptOrVariantChar(4).toCharArray();
localeVariant = this.readScriptOrVariantChar(8).toCharArray();
}
int exceedingSize = size - KNOWN_CONFIG_BYTES;
if (exceedingSize > 0) {
byte[] buf = new byte[exceedingSize];
mIn.readFully(buf);
BigInteger exceedingBI = new BigInteger(1, buf);
if (exceedingBI.equals(BigInteger.ZERO)) {
LOGGER.fine(String
.format("Config flags size > %d, but exceeding bytes are all zero, so it should be ok.",
KNOWN_CONFIG_BYTES));
} else {
LOGGER.warning(String.format("Config flags size > %d. Exceeding bytes: 0x%X.",
KNOWN_CONFIG_BYTES, exceedingBI));
isInvalid = true;
}
}
return new ResConfigFlags(mcc, mnc, language, country,
orientation, touchscreen, density, keyboard, navigation,
inputFlags, screenWidth, screenHeight, sdkVersion,
screenLayout, uiMode, smallestScreenWidthDp, screenWidthDp,
screenHeightDp, localeScript, localeVariant, isInvalid);
}
private char[] unpackLanguageOrRegion(byte in0, byte in1, char base) throws AndrolibException {
// check high bit, if so we have a packed 3 letter code
if (((in0 >> 7) & 1) == 1) {
int first = in1 & 0x1F;
int second = ((in1 & 0xE0) >> 5) + ((in0 & 0x03) << 3);
int third = (in0 & 0x7C) >> 2;
// since this function handles languages & regions, we add the value(s) to the base char
// which is usually 'a' or '0' depending on language or region.
return new char[] { (char) (first + base), (char) (second + base), (char) (third + base) };
}
return new char[] { (char) in0, (char) in1 };
}
private String readScriptOrVariantChar(int length) throws AndrolibException, IOException {
StringBuilder string = new StringBuilder(16);
while(length-- != 0) {
short ch = mIn.readByte();
if (ch == 0) {
break;
}
string.append((char) ch);
}
mIn.skipBytes(length);
return string.toString();
}
private void addMissingResSpecs() throws AndrolibException {
int resId = mResId & 0xffff0000;
for (int i = 0; i < mMissingResSpecs.length; i++) {
if (!mMissingResSpecs[i]) {
continue;
}
ResResSpec spec = new ResResSpec(new ResID(resId | i), String.format("APKTOOL_DUMMY_%04x", i), mPkg, mType);
mPkg.addResSpec(spec);
mType.addResSpec(spec);
if (mConfig == null) {
mConfig = mPkg.getOrCreateConfig(new ResConfigFlags());
}
ResValue value = new ResBoolValue(false, null);
ResResource res = new ResResource(mConfig, spec, value);
mPkg.addResource(res);
mConfig.addResource(res);
spec.addResource(res);
}
}
private Header nextChunk() throws IOException {
return mHeader = Header.read(mIn);
}
private void checkChunkType(int expectedType) throws AndrolibException {
if (mHeader.type != expectedType) {
throw new AndrolibException(String.format("Invalid chunk type: expected=0x%08x, got=0x%08x",
expectedType, mHeader.type));
}
}
private void nextChunkCheckType(int expectedType) throws IOException,
AndrolibException {
nextChunk();
checkChunkType(expectedType);
}
private final ExtDataInput mIn;
private final ResTable mResTable;
private final CountingInputStream mCountIn;
private final List<FlagsOffset> mFlagsOffsets;
private final boolean mKeepBroken;
private Header mHeader;
private StringBlock mTableStrings;
private StringBlock mTypeNames;
private StringBlock mSpecNames;
private ResPackage mPkg;
private ResType mType;
private ResConfig mConfig;
private int mResId;
private boolean[] mMissingResSpecs;
private final static short ENTRY_FLAG_COMPLEX = 0x0001;
public static class Header {
public final short type;
public final int chunkSize;
public Header(short type, int size) {
this.type = type;
this.chunkSize = size;
}
public static Header read(ExtDataInput in) throws IOException {
short type;
try {
type = in.readShort();
} catch (EOFException ex) {
return new Header(TYPE_NONE, 0);
}
in.skipBytes(2);
return new Header(type, in.readInt());
}
public final static short TYPE_NONE = -1, TYPE_TABLE = 0x0002,
TYPE_PACKAGE = 0x0200, TYPE_TYPE = 0x0202, TYPE_LIBRARY = 0x0203,
TYPE_CONFIG = 0x0201;
}
public static class FlagsOffset {
public final int offset;
public final int count;
public FlagsOffset(int offset, int count) {
this.offset = offset;
this.count = count;
}
}
private static final Logger LOGGER = Logger.getLogger(ARSCDecoder.class.getName());
private static final int KNOWN_CONFIG_BYTES = 48;
public static class ARSCData {
public ARSCData(ResPackage[] packages, FlagsOffset[] flagsOffsets, ResTable resTable) {
mPackages = packages;
mFlagsOffsets = flagsOffsets;
mResTable = resTable;
}
public FlagsOffset[] getFlagsOffsets() {
return mFlagsOffsets;
}
public ResPackage[] getPackages() {
return mPackages;
}
public ResPackage getOnePackage() throws AndrolibException {
if (mPackages.length <= 0) {
throw new AndrolibException("Arsc file contains zero packages");
} else if (mPackages.length != 1) {
int id = findPackageWithMostResSpecs();
LOGGER.info("Arsc file contains multiple packages. Using package "
+ mPackages[id].getName() + " as default.");
return mPackages[id];
}
return mPackages[0];
}
public int findPackageWithMostResSpecs() {
int count = -1;
int id = 0;
// set starting point to package id 0.
count = mPackages[0].getResSpecCount();
// loop through packages looking for largest
for (int i = 0; i < mPackages.length; i++) {
if (mPackages[i].getResSpecCount() >= count) {
count = mPackages[i].getResSpecCount();
id = i;
}
}
return id;
}
public ResTable getResTable() {
return mResTable;
}
private final ResPackage[] mPackages;
private final FlagsOffset[] mFlagsOffsets;
private final ResTable mResTable;
}
}