git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6544 6c8d7289-2bf4-0310-a012-ef5d649a1542pull/1/head
orbiter
15 years ago
parent
04d91c67d6
commit
d0b7bf9ca2
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// BDecoder.java
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// -----------------------
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// part of YaCy
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2010
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// Created 03.01.2010
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//
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// this is an BDecoder implementation according to http://wiki.theory.org/BitTorrentSpecification
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package net.yacy.kelondro.util;
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import java.io.File;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.LinkedHashMap;
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import java.util.List;
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import java.util.Map;
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public class BDecoder {
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private byte[] b;
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private int pos;
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public BDecoder(byte[] b) {
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this.b = b;
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this.pos = 0;
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}
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public enum BType {
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string, integer, list, dictionary;
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}
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public interface BObject {
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public BType getType();
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public String getString();
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public long getInteger();
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public List<BObject> getList();
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public Map<String, BObject> getMap();
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public String toString();
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}
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public class BDfltObject implements BObject {
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public long getInteger() {
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throw new UnsupportedOperationException();
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}
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public List<BObject> getList() {
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throw new UnsupportedOperationException();
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}
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public Map<String, BObject> getMap() {
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throw new UnsupportedOperationException();
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}
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public String getString() {
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throw new UnsupportedOperationException();
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}
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public BType getType() {
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throw new UnsupportedOperationException();
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}
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public String toString() {
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throw new UnsupportedOperationException();
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}
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}
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public class BStringObject extends BDfltObject implements BObject {
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String s;
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public BStringObject(String s) {
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this.s = s;
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}
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public BType getType() {
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return BType.string;
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}
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public String getString() {
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return this.s;
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}
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public String toString() {
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return this.s;
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}
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}
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public class BListObject extends BDfltObject implements BObject {
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List<BObject> l;
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public BListObject(List<BObject> l) {
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this.l = l;
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}
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public BType getType() {
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return BType.list;
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}
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public List<BObject> getList() {
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return this.l;
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}
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public String toString() {
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StringBuilder s = new StringBuilder();
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s.append("[");
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for (BObject o: l) s.append(o.toString()).append(",");
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s.setLength(s.length() - 1);
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s.append("]");
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return s.toString();
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}
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}
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public class BDictionaryObject extends BDfltObject implements BObject {
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Map<String, BObject> m;
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public BDictionaryObject(Map<String, BObject> m) {
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this.m = m;
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}
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public BType getType() {
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return BType.dictionary;
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}
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public Map<String, BObject> getMap() {
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return this.m;
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}
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public String toString() {
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StringBuilder s = new StringBuilder();
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s.append("{");
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for (Map.Entry<String, BObject> e: m.entrySet()) s.append(e.getKey()).append(":").append(e.getValue().toString()).append(",");
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s.setLength(s.length() - 1);
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s.append("}");
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return s.toString();
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}
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}
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public class BIntegerObject extends BDfltObject implements BObject {
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long i;
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public BIntegerObject(long i) {
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this.i = i;
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}
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public BType getType() {
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return BType.integer;
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}
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public long getInteger() {
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return this.i;
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}
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public String toString() {
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return Long.toString(this.i);
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}
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}
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private Map<String, BObject> convertToMap(final List<BObject> list) {
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final Map<String, BObject> m = new LinkedHashMap<String, BObject>();
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final int length = list.size();
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for (int i = 0; i < length; i += 2) {
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final String key = list.get(i).getString();
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BObject value = null;
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if (i + 1 < length) {
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value = list.get(i + 1);
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}
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m.put(key, value);
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}
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return m;
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}
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private List<BObject> readList() {
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final List<BObject> list = new ArrayList<BObject>();
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char ch = (char) b[pos];
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while (ch != 'e') {
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BObject bo = parse();
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if (bo == null) {pos++; break;}
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list.add(bo);
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ch = (char) b[pos];
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}
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pos++;
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return list;
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}
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public BObject parse() {
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if (pos >= b.length) return null;
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char ch = (char) b[pos];
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if ((ch >= '0') && (ch <= '9')) {
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int end = pos;
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end++;
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while (b[end] != ':') ++end;
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final int len = Integer.parseInt(new String(b, pos, end - pos));
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final String str = new String(b, end + 1, len);
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pos = end + len + 1;
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return new BStringObject(str);
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} else if (ch == 'l') {
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pos++;
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return new BListObject(readList());
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} else if (ch == 'd') {
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pos++;
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return new BDictionaryObject(convertToMap(readList()));
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} else if (ch == 'i') {
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pos++;
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int end = pos;
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while (b[end] != 'e') ++end;
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BIntegerObject io = new BIntegerObject(Long.parseLong(new String(b, pos, end - pos)));
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pos = end + 1;
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return io;
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} else {
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return null;
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}
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}
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public static void print(BObject bo, int t) {
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for (int i = 0; i < t; i++) System.out.print(" ");
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if (bo.getType() == BType.integer) System.out.println(bo.getInteger());
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if (bo.getType() == BType.string) System.out.println(bo.getString());
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if (bo.getType() == BType.list) {
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System.out.println("[");
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//for (int i = 0; i < t + 1; i++) System.out.print(" ");
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for (BObject o: bo.getList()) print(o, t + 1);
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for (int i = 0; i < t; i++) System.out.print(" ");
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System.out.println("]");
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}
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if (bo.getType() == BType.dictionary) {
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System.out.println("{");
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for (Map.Entry<String, BObject> e: bo.getMap().entrySet()) {
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for (int i = 0; i < t + 1; i++) System.out.print(" ");
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System.out.print(e.getKey());
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System.out.println(":");
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print(e.getValue(), t + 2);
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}
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for (int i = 0; i < t; i++) System.out.print(" ");
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System.out.println("}");
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}
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}
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public static void main(String[] args) {
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try {
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byte[] b = FileUtils.read(new File(args[0]));
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BDecoder bdecoder = new BDecoder(b);
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BObject o = bdecoder.parse();
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print(o, 0);
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System.out.println("Object: " + o.toString());
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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}
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