proguard.obfuscate.DictionaryNameFactory Maven / Gradle / Ivy
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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2020 Guardsquare NV
*
* 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.obfuscate;
import java.io.*;
import java.net.URL;
import java.util.*;
/**
* This NameFactory generates names that are read from a
* specified input file.
* Comments (everything starting with '#' on a single line) are ignored.
*
* @author Eric Lafortune
*/
public class DictionaryNameFactory implements NameFactory
{
private static final char COMMENT_CHARACTER = '#';
private final List names;
private final NameFactory nameFactory;
private int index = 0;
/**
* Creates a new DictionaryNameFactory.
* @param url the URL from which the names can be read.
* @param nameFactory the name factory from which names will be retrieved
* if the list of read names has been exhausted.
*/
public DictionaryNameFactory(URL url,
NameFactory nameFactory) throws IOException
{
this(url, true, nameFactory);
}
/**
* Creates a new DictionaryNameFactory.
* @param url the URL from which the names can be read.
* @param validJavaIdentifiers specifies whether the produced names should
* be valid Java identifiers.
* @param nameFactory the name factory from which names will be
* retrieved if the list of read names has been
* exhausted.
*/
public DictionaryNameFactory(URL url,
boolean validJavaIdentifiers,
NameFactory nameFactory) throws IOException
{
this (new BufferedReader(
new InputStreamReader(
url.openStream(), "UTF-8")),
validJavaIdentifiers,
nameFactory);
}
/**
* Creates a new DictionaryNameFactory.
* @param file the file from which the names can be read.
* @param nameFactory the name factory from which names will be retrieved
* if the list of read names has been exhausted.
*/
public DictionaryNameFactory(File file,
NameFactory nameFactory) throws IOException
{
this(file, true, nameFactory);
}
/**
* Creates a new DictionaryNameFactory.
* @param file the file from which the names can be read.
* @param validJavaIdentifiers specifies whether the produced names should
* be valid Java identifiers.
* @param nameFactory the name factory from which names will be
* retrieved if the list of read names has been
* exhausted.
*/
public DictionaryNameFactory(File file,
boolean validJavaIdentifiers,
NameFactory nameFactory) throws IOException
{
this (new BufferedReader(
new InputStreamReader(
new FileInputStream(file), "UTF-8")),
validJavaIdentifiers,
nameFactory);
}
/**
* Creates a new DictionaryNameFactory.
* @param reader the reader from which the names can be read. The
* reader is closed at the end.
* @param nameFactory the name factory from which names will be retrieved
* if the list of read names has been exhausted.
*/
public DictionaryNameFactory(Reader reader,
NameFactory nameFactory) throws IOException
{
this(reader, true, nameFactory);
}
/**
* Creates a new DictionaryNameFactory.
* @param reader the reader from which the names can be read.
* The reader is closed at the end.
* @param validJavaIdentifiers specifies whether the produced names should
* be valid Java identifiers.
* @param nameFactory the name factory from which names will be
* retrieved if the list of read names has been
* exhausted.
*/
public DictionaryNameFactory(Reader reader,
boolean validJavaIdentifiers,
NameFactory nameFactory) throws IOException
{
this.names = new ArrayList();
this.nameFactory = nameFactory;
try
{
StringBuffer buffer = new StringBuffer();
while (true)
{
// Read the next character.
int c = reader.read();
// Is it a valid identifier character?
if (c != -1 &&
(validJavaIdentifiers ?
(buffer.length() == 0 ?
Character.isJavaIdentifierStart((char)c) :
Character.isJavaIdentifierPart((char)c)) :
(c != '\n' &&
c != '\r' &&
c != COMMENT_CHARACTER)))
{
// Append it to the current identifier.
buffer.append((char)c);
}
else
{
// Did we collect a new identifier?
if (buffer.length() > 0)
{
// Add the completed name to the list of names, if it's
// not in it yet.
String name = buffer.toString();
if (!names.contains(name))
{
names.add(name);
}
// Clear the buffer.
buffer.setLength(0);
}
// Is this the beginning of a comment line?
if (c == COMMENT_CHARACTER)
{
// Skip all characters till the end of the line.
do
{
c = reader.read();
}
while (c != -1 &&
c != '\n' &&
c != '\r');
}
// Is this the end of the file?
if (c == -1)
{
// Just return.
return;
}
}
}
}
finally
{
reader.close();
}
}
/**
* Creates a new DictionaryNameFactory.
* @param dictionaryNameFactory the dictionary name factory whose dictionary
* will be used.
* @param nameFactory the name factory from which names will be
* retrieved if the list of read names has been
* exhausted.
*/
public DictionaryNameFactory(DictionaryNameFactory dictionaryNameFactory,
NameFactory nameFactory)
{
this.names = dictionaryNameFactory.names;
this.nameFactory = nameFactory;
}
// Implementations for NameFactory.
public void reset()
{
index = 0;
nameFactory.reset();
}
public String nextName()
{
String name;
// Do we still have names?
if (index < names.size())
{
// Return the next name.
name = (String)names.get(index++);
}
else
{
// Return the next different name from the other name factory.
do
{
name = nameFactory.nextName();
}
while (names.contains(name));
}
return name;
}
public static void main(String[] args)
{
try
{
DictionaryNameFactory factory =
new DictionaryNameFactory(new File(args[0]), new SimpleNameFactory());
// For debugging, we're always using UTF-8 instead of the default
// character encoding, even for writing to the standard output.
PrintWriter out =
new PrintWriter(new OutputStreamWriter(System.out, "UTF-8"));
for (int counter = 0; counter < 50; counter++)
{
out.println("[" + factory.nextName() + "]");
}
out.flush();
}
catch (IOException ex)
{
ex.printStackTrace();
}
}
}
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