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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.io;
import proguard.classfile.*;
import proguard.classfile.util.ClassUtil;
import java.io.IOException;
import java.util.Map;
/**
* This DataEntryReader delegates to another DataEntryReader, renaming the
* data entries based on the renamed classes in the given ClassPool.
*
* @author Eric Lafortune
*/
public class DataEntryObfuscator implements DataEntryReader
{
private final ClassPool classPool;
private final Map packagePrefixMap;
private final DataEntryReader dataEntryReader;
/**
* Creates a new DataEntryObfuscator.
* @param classPool the class pool that maps from old names to new
* names.
* @param packagePrefixMap the map from old package prefixes to new package
* prefixes.
* @param dataEntryReader the DataEntryReader to which calls will be
* delegated.
*/
public DataEntryObfuscator(ClassPool classPool,
Map packagePrefixMap,
DataEntryReader dataEntryReader)
{
this.classPool = classPool;
this.packagePrefixMap = packagePrefixMap;
this.dataEntryReader = dataEntryReader;
}
// Implementations for DataEntryReader.
public void read(DataEntry dataEntry) throws IOException
{
// Delegate to the actual data entry reader.
dataEntryReader.read(renamedDataEntry(dataEntry));
}
/**
* Create a renamed data entry, if possible.
*/
private DataEntry renamedDataEntry(DataEntry dataEntry)
{
String dataEntryName = dataEntry.getName();
// Try to find a corresponding class name by removing increasingly
// long suffixes.
for (int suffixIndex = dataEntryName.length() - 1;
suffixIndex > 0;
suffixIndex--)
{
char c = dataEntryName.charAt(suffixIndex);
if (!Character.isLetterOrDigit(c))
{
// Chop off the suffix.
String className = dataEntryName.substring(0, suffixIndex);
// Did we get to the package separator?
if (c == ClassConstants.PACKAGE_SEPARATOR)
{
break;
}
// Is there a class corresponding to the data entry?
Clazz clazz = classPool.getClass(className);
if (clazz != null)
{
// Did the class get a new name?
String newClassName = clazz.getName();
if (!className.equals(newClassName))
{
// Return a renamed data entry.
String newDataEntryName =
newClassName + dataEntryName.substring(suffixIndex);
return new RenamedDataEntry(dataEntry, newDataEntryName);
}
else
{
// Otherwise stop looking.
return dataEntry;
}
}
}
}
// Try to find a corresponding package name by increasingly removing
// more subpackages.
String packagePrefix = dataEntryName;
do
{
// Chop off the class name or the last subpackage name.
packagePrefix = ClassUtil.internalPackagePrefix(packagePrefix);
// Is there a package corresponding to the package prefix?
String newPackagePrefix = (String)packagePrefixMap.get(packagePrefix);
if (newPackagePrefix != null)
{
// Did the package get a new name?
if (!packagePrefix.equals(newPackagePrefix))
{
// Return a renamed data entry.
String newDataEntryName =
newPackagePrefix + dataEntryName.substring(packagePrefix.length());
return new RenamedDataEntry(dataEntry, newDataEntryName);
}
else
{
// Otherwise stop looking.
return dataEntry;
}
}
}
while (packagePrefix.length() > 0);
return dataEntry;
}
}
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