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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;
import java.io.*;
import java.util.*;
/**
* This class checks and prints out information about the GPL.
*
* @author Eric Lafortune
*/
public class GPL
{
/**
* Prints out a note about the GPL if ProGuard is linked against unknown
* code.
*/
public static void check()
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
new Exception().printStackTrace(new PrintStream(out));
LineNumberReader reader = new LineNumberReader(
new InputStreamReader(
new ByteArrayInputStream(out.toByteArray())));
Set unknownPackageNames = unknownPackageNames(reader);
if (unknownPackageNames.size() > 0)
{
String uniquePackageNames = uniquePackageNames(unknownPackageNames);
System.out.println("ProGuard is released under the GNU General Public License. You therefore");
System.out.println("must ensure that programs that link to it ("+uniquePackageNames+"...)");
System.out.println("carry the GNU General Public License as well. Alternatively, you can");
System.out.println("apply for an exception with the author of ProGuard.");
}
}
/**
* Returns a set of package names from the given stack trace.
*/
private static Set unknownPackageNames(LineNumberReader reader)
{
Set packageNames = new HashSet();
try
{
while (true)
{
String line = reader.readLine();
if (line == null)
{
break;
}
line = line.trim();
if (line.startsWith("at "))
{
line = line.substring(2).trim();
line = trimSuffix(line, '(');
line = trimSuffix(line, '.');
line = trimSuffix(line, '.');
if (line.length() > 0 && !isKnown(line))
{
packageNames.add(line);
}
}
}
}
catch (IOException ex)
{
// We'll just stop looking for more names.
}
return packageNames;
}
/**
* Returns a comma-separated list of package names from the set, excluding
* any subpackages of packages in the set.
*/
private static String uniquePackageNames(Set packageNames)
{
StringBuffer buffer = new StringBuffer();
Iterator iterator = packageNames.iterator();
while (iterator.hasNext())
{
String packageName = (String)iterator.next();
if (!containsPrefix(packageNames, packageName))
{
buffer.append(packageName).append(", ");
}
}
return buffer.toString();
}
/**
* Returns a given string without the suffix, as defined by the given
* separator.
*/
private static String trimSuffix(String string, char separator)
{
int index = string.lastIndexOf(separator);
return index < 0 ? "" : string.substring(0, index);
}
/**
* Returns whether the given set contains a prefix of the given name.
*/
private static boolean containsPrefix(Set set, String name)
{
int index = 0;
while (!set.contains(name.substring(0, index)))
{
index = name.indexOf('.', index + 1);
if (index < 0)
{
return false;
}
}
return true;
}
/**
* Returns whether the given package name has been granted an exception
* against the GPL linking clause, by the copyright holder of ProGuard.
* This method is not legally binding, but of course the actual license is.
* Please contact the copyright holder if you would like an exception for
* your code as well.
*/
private static boolean isKnown(String packageName)
{
return packageName.startsWith("java") ||
packageName.startsWith("sun.reflect") ||
packageName.startsWith("proguard") ||
packageName.startsWith("org.apache.tools.ant") ||
packageName.startsWith("org.apache.tools.maven") ||
packageName.startsWith("org.gradle") ||
packageName.startsWith("org.codehaus.groovy") ||
packageName.startsWith("org.eclipse") ||
packageName.startsWith("org.netbeans") ||
packageName.startsWith("com.android") ||
packageName.startsWith("com.sun.kvem") ||
packageName.startsWith("net.certiv.proguarddt") ||
packageName.startsWith("groovy") ||
packageName.startsWith("scala") ||
packageName.startsWith("sbt") ||
packageName.startsWith("xsbt") ||
packageName.startsWith("eclipseme");
}
public static void main(String[] args)
{
LineNumberReader reader = new LineNumberReader(
new InputStreamReader(System.in));
Set unknownPackageNames = unknownPackageNames(reader);
if (unknownPackageNames.size() > 0)
{
String uniquePackageNames = uniquePackageNames(unknownPackageNames);
System.out.println(uniquePackageNames);
}
}
}
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