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BEncoder.java
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BEncoder.java
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/*
* BEncoder.java
*
* Created on June 4, 2003, 10:17 PM
* Copyright (C) 2003, 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* 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.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*/
package jBittorrentAPI;
import java.io.*;
import java.nio.*;
import java.util.*;
/**
* A set of utility methods to encode a Map into a bencoded array of byte.
* integer are represented as Long, String as byte[], dictionnaries as Map, and list as List.
*
* @author TdC_VgA
*/
public class
BEncoder {
public static byte[] encode(Map object) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
new BEncoder().encode(baos, object);
return baos.toByteArray();
}
private void
encode(
ByteArrayOutputStream baos,
Object object)
throws IOException {
if (object instanceof String || object instanceof Float) {
String tempString = (object instanceof String) ? (String) object :
String.valueOf((Float) object);
ByteBuffer bb = Constants.DEFAULT_CHARSET.encode(tempString);
write(baos,
Constants.DEFAULT_CHARSET.encode(String.valueOf(bb.limit())));
baos.write(':');
write(baos, bb);
} else if (object instanceof Map) {
Map tempMap = (Map) object;
SortedMap tempTree = null;
// unfortunately there are some occasions where we want to ensure that
// the 'key' of the map is not mangled by assuming its UTF-8 encodable.
// In particular the response from a tracker scrape request uses the
// torrent hash as the KEY. Hence the introduction of the type below
// to allow the constructor of the Map to indicate that the keys should
// be extracted using a BYTE_ENCODING
boolean byte_keys = false; //object instanceof ByteEncodedKeyHashMap;
//write the d
baos.write('d');
//are we sorted?
if (tempMap instanceof TreeMap) {
tempTree = (TreeMap) tempMap;
} else {
//do map sorting here
tempTree = new TreeMap(tempMap);
}
Iterator it = tempTree.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
Object o_key = entry.getKey();
Object value = entry.getValue();
if (value != null) {
if (o_key instanceof byte[]) {
encode(baos, (byte[]) o_key);
encode(baos, value);
} else {
String key = (String) o_key;
if (byte_keys) {
try {
encode(baos, Constants.BYTE_CHARSET.encode(key));
encode(baos, tempMap.get(key));
} catch (UnsupportedEncodingException e) {
throw (new IOException(
"BEncoder: unsupport encoding: " +
e.getMessage()));
}
} else {
encode(baos, key); // Key goes in as UTF-8
encode(baos, value);
}
}
}
}
baos.write('e');
} else if (object instanceof List) {
List tempList = (List) object;
//write out the l
baos.write('l');
for (int i = 0; i < tempList.size(); i++) {
encode(baos, tempList.get(i));
}
baos.write('e');
} else if (object instanceof Long) {
Long tempLong = (Long) object;
//write out the l
baos.write('i');
write(baos, Constants.DEFAULT_CHARSET.encode(tempLong.toString()));
baos.write('e');
} else if (object instanceof Integer) {
Integer tempInteger = (Integer) object;
//write out the l
baos.write('i');
write(baos, Constants.DEFAULT_CHARSET.encode(tempInteger.toString()));
baos.write('e');
} else if (object instanceof byte[]) {
byte[] tempByteArray = (byte[]) object;
write(baos,
Constants.DEFAULT_CHARSET.encode(String.valueOf(tempByteArray.
length)));
baos.write(':');
baos.write(tempByteArray);
} else if (object instanceof ByteBuffer) {
ByteBuffer bb = (ByteBuffer) object;
write(baos,
Constants.DEFAULT_CHARSET.encode(String.valueOf(bb.limit())));
baos.write(':');
write(baos, bb);
}
}
protected void
write(
OutputStream os,
ByteBuffer bb)
throws IOException {
os.write(bb.array(), 0, bb.limit());
}
private static boolean
objectsAreIdentical(
Object o1,
Object o2) {
if (o1 == null && o2 == null) {
return (true);
} else if (o1 == null || o2 == null) {
return (false);
}
if (o1 instanceof Integer) {
o1 = new Long(((Integer) o1).longValue());
}
if (o2 instanceof Integer) {
o2 = new Long(((Integer) o2).longValue());
}
if (o1 instanceof Float) {
o1 = String.valueOf((Float) o1);
}
if (o2 instanceof Float) {
o2 = String.valueOf((Float) o2);
}
if (o1.getClass() != o2.getClass()) {
return (false);
}
if (o1 instanceof Long) {
return (o1.equals(o2));
} else if (o1 instanceof byte[]) {
return (Arrays.equals((byte[]) o1, (byte[]) o2));
} else if (o1 instanceof ByteBuffer) {
return (o1.equals(o2));
} else if (o1 instanceof String) {
return (o1.equals(o2));
} else if (o1 instanceof List) {
return (listsAreIdentical((List) o1, (List) o2));
} else if (o1 instanceof Map) {
return (mapsAreIdentical((Map) o1, (Map) o2));
} else {
System.err.println("Invalid type: " + o1);
return (false);
}
}
public static boolean
listsAreIdentical(
List list1,
List list2) {
if (list1 == null && list2 == null) {
return (true);
} else if (list1 == null || list2 == null) {
return (false);
}
if (list1.size() != list2.size()) {
return (false);
}
for (int i = 0; i < list1.size(); i++) {
if (!objectsAreIdentical(list1.get(i), list2.get(i))) {
return (false);
}
}
return (true);
}
public static boolean
mapsAreIdentical(
Map map1,
Map map2) {
if (map1 == null && map2 == null) {
return (true);
} else if (map1 == null || map2 == null) {
return (false);
}
if (map1.size() != map2.size()) {
return (false);
}
Iterator it = map1.keySet().iterator();
while (it.hasNext()) {
Object key = it.next();
Object v1 = map1.get(key);
Object v2 = map2.get(key);
if (!objectsAreIdentical(v1, v2)) {
return (false);
}
}
return (true);
}
}