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Android binary resources read/write library
/*
* Copyright (C) 2022 github.com/REAndroid
*
* 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 com.reandroid.apk;
import com.reandroid.archive.ZipEntryMap;
import com.reandroid.archive.InputSource;
import com.reandroid.arsc.chunk.TableBlock;
import com.reandroid.arsc.chunk.xml.AndroidManifestBlock;
import com.reandroid.arsc.chunk.xml.ResXmlAttribute;
import com.reandroid.arsc.chunk.xml.ResXmlElement;
import com.reandroid.arsc.chunk.xml.ResXmlNode;
import com.reandroid.arsc.model.ResourceEntry;
import com.reandroid.arsc.io.BlockReader;
import com.reandroid.arsc.pool.ResXmlStringPool;
import com.reandroid.arsc.model.FrameworkTable;
import com.reandroid.arsc.value.*;
import java.io.IOException;
import java.util.*;
import java.util.zip.ZipEntry;
public class FrameworkOptimizer {
private final ApkModule frameworkApk;
private APKLogger apkLogger;
private boolean mOptimizing;
public FrameworkOptimizer(ApkModule frameworkApk){
this.frameworkApk = frameworkApk;
this.apkLogger = frameworkApk.getApkLogger();
}
public void optimize(){
if(mOptimizing){
return;
}
mOptimizing = true;
if(!frameworkApk.hasTableBlock()){
logMessage("Don't have: "+TableBlock.FILE_NAME);
mOptimizing = false;
return;
}
FrameworkTable frameworkTable = getFrameworkTable();
AndroidManifestBlock manifestBlock = null;
if(frameworkApk.hasAndroidManifestBlock()){
manifestBlock = frameworkApk.getAndroidManifestBlock();
}
optimizeTable(frameworkTable, manifestBlock);
UncompressedFiles uncompressedFiles = frameworkApk.getUncompressedFiles();
uncompressedFiles.clearExtensions();
uncompressedFiles.clearPaths();
clearFiles(frameworkApk.getZipEntryMap());
logMessage("Optimized");
}
private void clearFiles(ZipEntryMap zipEntryMap){
int size = zipEntryMap.size();
if(size == 2){
return;
}
logMessage("Removing files from: " + size);
InputSource tableSource = zipEntryMap.getInputSource(TableBlock.FILE_NAME);
InputSource manifestSource = zipEntryMap.getInputSource(AndroidManifestBlock.FILE_NAME);
zipEntryMap.clear();
if(tableSource!=null){
tableSource.setMethod(ZipEntry.DEFLATED);
}
if(manifestSource!=null){
manifestSource.setMethod(ZipEntry.DEFLATED);
}
zipEntryMap.add(tableSource);
zipEntryMap.add(manifestSource);
size = size - zipEntryMap.size();
logMessage("Removed files: "+size);
}
private void optimizeTable(FrameworkTable table, AndroidManifestBlock manifestBlock){
if(table.isOptimized()){
return;
}
logMessage("Optimizing ...");
int prev = table.countBytes();
int version = 0;
String name = "framework";
if(manifestBlock !=null){
Integer code = manifestBlock.getVersionCode();
if(code!=null){
version = code;
}
name = manifestBlock.getPackageName();
compressManifest(manifestBlock);
backupManifestValue(manifestBlock, table);
}
logMessage("Optimizing table ...");
table.optimize(name, version);
long diff=prev - table.countBytes();
long percent=(diff*100L)/prev;
logMessage("Table size reduced by: "+percent+" %");
mOptimizing = false;
}
private FrameworkTable getFrameworkTable(){
TableBlock tableBlock = frameworkApk.getTableBlock();
if(tableBlock instanceof FrameworkTable){
return (FrameworkTable) tableBlock;
}
FrameworkTable frameworkTable = toFramework(tableBlock);
frameworkApk.setTableBlock(frameworkTable);
return frameworkTable;
}
private FrameworkTable toFramework(TableBlock tableBlock){
logMessage("Converting to framework ...");
BlockReader reader = new BlockReader(tableBlock.getBytes());
FrameworkTable frameworkTable = new FrameworkTable();
try {
frameworkTable.readBytes(reader);
} catch (IOException exception) {
logError("Error re-loading framework: ", exception);
}
return frameworkTable;
}
private void compressManifest(AndroidManifestBlock manifestBlock){
logMessage("Compressing manifest ...");
int prev = manifestBlock.countBytes();
ResXmlElement manifest = manifestBlock.getResXmlElement();
List removeList = getManifestElementToRemove(manifest);
for(ResXmlNode node:removeList){
manifest.removeNode(node);
}
ResXmlElement application = manifestBlock.getApplicationElement();
if(application!=null){
removeList = application.listXmlNodes();
for(ResXmlNode node:removeList){
application.removeNode(node);
}
}
ResXmlStringPool stringPool = manifestBlock.getStringPool();
stringPool.removeUnusedStrings();
manifestBlock.refresh();
long diff=prev - manifestBlock.countBytes();
long percent=(diff*100L)/prev;
logMessage("Manifest size reduced by: "+percent+" %");
}
private List getManifestElementToRemove(ResXmlElement manifest){
List results = new ArrayList<>();
for(ResXmlNode node:manifest.listXmlNodes()){
if(!(node instanceof ResXmlElement)){
continue;
}
ResXmlElement element = (ResXmlElement)node;
if(AndroidManifestBlock.TAG_application.equals(element.getName())){
continue;
}
results.add(element);
}
return results;
}
private void backupManifestValue(AndroidManifestBlock manifestBlock, TableBlock tableBlock){
logMessage("Backup manifest values ...");
ResXmlElement application = manifestBlock.getApplicationElement();
ResXmlAttribute iconAttribute = null;
int iconReference = 0;
if(application!=null){
ResXmlAttribute attribute = application
.searchAttributeByResourceId(AndroidManifestBlock.ID_icon);
if(attribute!=null && attribute.getValueType()==ValueType.REFERENCE){
iconAttribute = attribute;
iconReference = attribute.getData();
}
}
ResXmlElement element = manifestBlock.getResXmlElement();
backupAttributeValues(tableBlock, element);
if(iconAttribute!=null){
iconAttribute.setTypeAndData(ValueType.REFERENCE, iconReference);
}
}
private void backupAttributeValues(TableBlock tableBlock, ResXmlElement element){
if(element==null){
return;
}
for(ResXmlAttribute attribute: element.listAttributes()){
backupAttributeValues(tableBlock, attribute);
}
for(ResXmlElement child: element.listElements()){
backupAttributeValues(tableBlock, child);
}
}
private void backupAttributeValues(TableBlock tableBlock, ResXmlAttribute attribute){
if(attribute==null){
return;
}
ValueType valueType = attribute.getValueType();
if(valueType!=ValueType.REFERENCE && valueType!=ValueType.ATTRIBUTE){
return;
}
int reference = attribute.getData();
Entry entry = getEntryWithValue(tableBlock, reference);
if(entry == null || isReferenceEntry(entry) || entry.isComplex()){
return;
}
ResTableEntry resTableEntry = (ResTableEntry) entry.getTableEntry();
ResValue resValue = resTableEntry.getValue();
valueType = resValue.getValueType();
if(valueType==ValueType.STRING){
String value = resValue.getValueAsString();
attribute.setValueAsString(value);
}else {
int data = resValue.getData();
attribute.setTypeAndData(valueType, data);
}
}
private Entry getEntryWithValue(TableBlock tableBlock, int resourceId){
Set circularReference = new HashSet<>();
return getEntryWithValue(tableBlock, resourceId, circularReference);
}
private Entry getEntryWithValue(TableBlock tableBlock, int resourceId, Set circularReference){
if(circularReference.contains(resourceId)){
return null;
}
circularReference.add(resourceId);
ResourceEntry entryGroup = tableBlock.getResource(resourceId);
Entry entry = entryGroup.get();
if(entry==null){
return null;
}
if(isReferenceEntry(entry)){
return getEntryWithValue(
tableBlock,
((ResValue)entry.getTableEntry().getValue()).getData(),
circularReference);
}
if(!entry.isNull()){
return entry;
}
Iterator itr = entryGroup.iterator(true);
while (itr.hasNext()){
entry = itr.next();
if(!isReferenceEntry(entry)){
if(!entry.isNull()){
return entry;
}
}
}
return null;
}
private boolean isReferenceEntry(Entry entry){
if(entry==null || entry.isNull()){
return false;
}
TableEntry tableEntry = entry.getTableEntry();
if(tableEntry instanceof CompoundEntry){
return false;
}
if(!(tableEntry instanceof ResTableEntry)){
return false;
}
ResTableEntry resTableEntry = (ResTableEntry) tableEntry;
ResValue resValue = resTableEntry.getValue();
ValueType valueType = resValue.getValueType();
return valueType == ValueType.REFERENCE
|| valueType == ValueType.ATTRIBUTE;
}
APKLogger getApkLogger(){
return apkLogger;
}
public void setAPKLogger(APKLogger logger) {
this.apkLogger = logger;
}
void logMessage(String msg) {
if(apkLogger!=null){
apkLogger.logMessage(msg);
}
}
private void logError(String msg, Throwable tr) {
if(apkLogger!=null){
apkLogger.logError(msg, tr);
}
}
private void logVerbose(String msg) {
if(apkLogger!=null){
apkLogger.logVerbose(msg);
}
}
}
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