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Bencode Input/Output Streams for Java

License: Apache License 2.0

Java 100.00%

java bencoder bencode bencode-parser

bencode's Introduction

bencode

Bencode Input/Output Streams for Java

Requires JDK 1.8 or higher

Bencode Spec

Bencode Wikipedia

Javadoc

http://dampcake.github.io/bencode

Usage

Maven

<dependency>
    <groupId>com.dampcake</groupId>
    <artifactId>bencode</artifactId>
    <version>1.4.1</version>
</dependency>

Gradle

compile 'com.dampcake:bencode:1.4.1'

Examples

Bencode Data

Bencode bencode = new Bencode();
byte[] encoded = bencode.encode(new HashMap<Object, Object>() {{
    put("string", "value");
    put("number", 123456);
    put("list", new ArrayList<Object>() {{
        add("list-item-1");
        add("list-item-2");
    }});
    put("dict", new ConcurrentSkipListMap() {{
        put(123, "test");
        put(456, "thing");
    }});
}});

System.out.println(new String(encoded, bencode.getCharset()));

Outputs: d4:dictd3:1234:test3:4565:thinge4:listl11:list-item-111:list-item-2e6:numberi123456e6:string5:valuee

Decode Bencoded Data:

Bencode bencode = new Bencode();
Map<String, Object> dict = bencode.decode("d4:dictd3:1234:test3:4565:thinge4:listl11:list-item-111:list-item-2e6:numberi123456e6:string5:valuee".getBytes(), Type.DICTIONARY);

System.out.println(dict);

Outputs: {dict={123=test, 456=thing}, list=[list-item-1, list-item-2], number=123456, string=value}

Write bencoded data to a Stream:

ByteArrayOutputStream out = new ByteArrayOutputStream();
BencodeOutputStream bencoder = new BencodeOutputStream(out);

bencoder.writeDictionary(new HashMap<Object, Object>() {{
    put("string", "value");
    put("number", 123456);
    put("list", new ArrayList<Object>() {{
        add("list-item-1");
        add("list-item-2");
    }});
    put("dict", new ConcurrentSkipListMap() {{
        put("dict-item-1", "test");
        put("dict-item-2", "thing");
    }});
}});

System.out.println(new String(out.toByteArray()));

Outputs: d4:dictd11:dict-item-14:test11:dict-item-25:thinge4:listl11:list-item-111:list-item-2e6:numberi123456e6:string5:valuee

Read bencoded data to a Stream:

String input = "d4:dictd11:dict-item-14:test11:dict-item-25:thinge4:listl11:list-item-111:list-item-2e6:numberi123456e6:string5:valuee";
ByteArrayInputStream in = new ByteArrayInputStream(input.getBytes());
BencodeInputStream bencode = new BencodeInputStream(in);

Type type = bencode.nextType(); // Returns Type.DICTIONARY
Map<String, Object> dict = bencode.readDictionary();

System.out.println(dict);

Outputs: {dict={dict-item-1=test, dict-item-2=thing}, list=[list-item-1, list-item-2], number=123456, string=value}

bencode's People

Contributors

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Forkers

jaycuse alepar eontechnology nikaxi lishangwl mkapelina lucassaldanha fuckerdeng andsdev blanexie manuel-sugawara john-chan abhishekjadoun bestyize aruthane meimingle

bencode's Issues

Why did I get the hash incorrectly?

java env

java version "1.8.0_191"
Java(TM) SE Runtime Environment (build 1.8.0_191-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode)

critical code

/**
 * torrentFile see torrent.zip
 */
byte[] torrentData = FileUtils.readFileToByteArray(new File(torrentFile))
Bencode bencode = new Bencode();
Map<String, Object> torrentMap = bencode.decode(torrentData, Type.DICTIONARY);
Map<String, Object> info = (Map<String, Object>) torrentMap.get("info");
byte[] hashByte = hash(bencode.encode(info));
System.out.println(bytesToHex(hashByte));

public static String bytesToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_SYMBOLS[v >>> 4];
            hexChars[j * 2 + 1] = HEX_SYMBOLS[v & 0x0F];
        }
        return new String(hexChars);
    }

The correct hash is:
C8AE498D84E1ABC0EE9A72046E31E82B6A5C8C74
but i get hash is
D5FFE89589B9BACB195C2771C3FC328BF3880623

torrent.zip

thx, - ̗̀(๑ᵔ⌔ᵔ๑)

NumberFormatException: For input string: "-2.9155148901435E+18"

While using bencode-1.3 to decode torrent files, got exception below:

Caused by: java.lang.NumberFormatException: For input string: "-2.9155148901435E+18"
at java.lang.NumberFormatException.forInputString(Unknown Source) ~[?:1.8.0_152]
at java.lang.Long.parseLong(Unknown Source) ~[?:1.8.0_152]
at java.lang.Long.parseLong(Unknown Source) ~[?:1.8.0_152]
at com.dampcake.bencode.BencodeInputStream.readNumber(BencodeInputStream.java:201) ~[bencode-1.3.jar:?]
at com.dampcake.bencode.BencodeInputStream.readObject(BencodeInputStream.java:261) ~[bencode-1.3.jar:?]
at com.dampcake.bencode.BencodeInputStream.readDictionary(BencodeInputStream.java:245) ~[bencode-1.3.jar:?]
at com.dampcake.bencode.BencodeInputStream.readObject(BencodeInputStream.java:265) ~[bencode-1.3.jar:?]
at com.dampcake.bencode.BencodeInputStream.readDictionary(BencodeInputStream.java:245) ~[bencode-1.3.jar:?]
at dpf.mg.udi.gpinf.bittorrent.BencodedDict.(BencodedDict.java:27) ~[iped-parsers-impl-3.17.2.jar:?]
at dpf.mg.udi.gpinf.bittorrent.TorrentFileParser.parse(TorrentFileParser.java:58) ~[iped-parsers-impl-3.17.2.jar:?]
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) ~[tika-core-1.20.jar:1.20]

Decode exception when decoding string from http://bttracker.debian.org/

Hi,

Just found may be an issue, when I try to use bencode.decode some string from debian bttracker, always got exception.

How to reproduce:

Make a get call use following url:
http://bttracker.debian.org:6969/announce?info_hash=N%f5%ad%16%c0%9e%b5%0b%8c%3b%90~%02u%24%eeC%ad%ad%01&peer_id=%ff%fe%fd%fc%fb%fa%f9%f8%f7%f6%f5%f4%f3%f2%f1%f0%ef%ee%ed%ec&port=6881&uploaded=0&downloaded=0&left=659554304%22

then will get following UTF_8 String back:

"d8:intervali900e5:peers2:ip13:213.49.181.984:porti6881e2:ip14:216.195.129.274:porti6881e2:ip12:146.71.73.214:porti6881e2:ip12:146.71.73.514:porti6881eee"

When I try to decode the above string,

Bencode bencode = new Bencode(StandardCharsets.UTF_8, true);
bencode.decode("d8:intervali900e5:peers2:ip13:213.49.181.984:porti6881e2:ip14:216.195.129.274:porti6881e2:ip12:146.71.73.214:porti6881e2:ip12:146.71.73.514:porti6881eee".getBytes(StandardCharsets.UTF_8,), Type.DICTIONARY);

then got an exception:

"Unexcept token 'i'"

I try to debug it, then found out that "d8:" these 3 chars are ok, till the fourth chars "i", then got the exception.

I just want to confirm, if it is the string encode problem? or something else?

btw: Env: Java 11, Mac OS. I use the example string in the README.md, the decoding works fine.

Thank you for your help!

best regards

Mike