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robothaverrobothaver
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‎.gitignore

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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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/.idea/
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/out/

‎pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.robothaver</groupId>
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<artifactId>TorrentFileParser</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>17</maven.compiler.source>
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<maven.compiler.target>17</maven.compiler.target>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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</properties>
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</project>

‎src/main/java/com/robothaver/torrentfileparser/Main.java

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package com.robothaver.torrentfileparser;
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import com.robothaver.torrentfileparser.domain.Torrent;
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import com.robothaver.torrentfileparser.exception.MalformedTorrentFileException;
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import java.io.IOException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.time.Duration;
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import java.time.Instant;
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public class Main {
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public static void main(String[] args) {
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Path path = Paths.get("Path to torrent file");
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try {
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byte[] bytes = Files.readAllBytes(path);
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Instant start = Instant.now();
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TorrentFileParser torrentParser = new TorrentFileParser(bytes);
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Torrent torrent = torrentParser.parseToTorrent();
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System.out.println(torrent.getName());
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Instant finish = Instant.now();
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long timeElapsed = Duration.between(start, finish).toMillis();
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System.out.println("Parsing finished in " + timeElapsed + "ms");
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} catch (IOException | MalformedTorrentFileException e) {
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throw new RuntimeException(e);
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}
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}
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}

‎src/main/java/com/robothaver/torrentfileparser/TorrentFileParser.java

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package com.robothaver.torrentfileparser;
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import com.robothaver.torrentfileparser.domain.Torrent;
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import com.robothaver.torrentfileparser.domain.TorrentBuilder;
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import com.robothaver.torrentfileparser.exception.MalformedTorrentFileException;
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import java.util.*;
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public class TorrentFileParser {
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private final byte[] bytes;
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private int iterator = 0;
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private TorrentBuilder torrentBuilder = null;
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public TorrentFileParser(byte[] bytes) {
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this.bytes = bytes;
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}
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private Object parse() throws MalformedTorrentFileException {
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return switch (bytes[iterator]) {
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case 'i' -> parseInt();
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case 'l' -> parseList();
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case 'd' -> parseDict();
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default -> {
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if (isInt(bytes[iterator])) {
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yield parseString();
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} else {
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throw new MalformedTorrentFileException("Illegal character " + (char) bytes[iterator] + " at " + iterator);
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}
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}
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};
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}
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public Torrent parseToTorrent() throws MalformedTorrentFileException {
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torrentBuilder = new TorrentBuilder();
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parse();
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iterator = 0;
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return torrentBuilder.getTorrent();
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}
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public Map<String, Object> parseToMap() throws MalformedTorrentFileException {
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return (Map<String, Object>) parse();
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}
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private boolean isInt(byte currentByte) {
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return (byte) '0' <= currentByte && currentByte <= (byte) '9';
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}
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private List<Object> parseList() throws MalformedTorrentFileException {
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iterator++; // Skipping the l
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List<Object> list = new ArrayList<>();
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while (bytes[iterator] != 'e') {
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list.add(parse());
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}
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iterator++; // Skipping closing e
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return list;
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}
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private Map<String, Object> parseDict() throws MalformedTorrentFileException {
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iterator++; // Skipping the d
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Map<String, Object> map = new HashMap<>();
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String key = null;
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while (bytes[iterator] != 'e') {
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Object parseValue = parse();
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if (key == null) {
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key = String.valueOf(parseValue);
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} else {
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map.put(key, parseValue);
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if (torrentBuilder != null) {
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torrentBuilder.processKeyValue(key, parseValue);
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}
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key = null;
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}
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}
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iterator++; // Skipping closing e
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return map;
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}
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private String parseString() throws MalformedTorrentFileException {
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int startIndex = iterator;
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int colonIndex = 0;
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while (iterator < bytes.length) {
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if (bytes[iterator] == (byte) ':') {
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colonIndex = iterator;
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break;
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} else {
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iterator++;
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}
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}
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int length;
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try {
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length = Integer.parseInt(new String(Arrays.copyOfRange(bytes, startIndex, colonIndex)));
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} catch (NumberFormatException e) {
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throw new MalformedTorrentFileException();
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}
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String value = new String(Arrays.copyOfRange(bytes, colonIndex + 1, colonIndex + length + 1));
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iterator += length + 1;
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return value;
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}
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private Long parseInt() {
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int startIndex = iterator + 1;
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while (bytes[iterator] != 'e') {
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iterator++;
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}
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byte[] valueBytes = Arrays.copyOfRange(bytes, startIndex, iterator);
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iterator++; // Skipping closing e
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return Long.parseLong(new String(valueBytes));
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}
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}

‎src/main/java/com/robothaver/torrentfileparser/domain/Torrent.java

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package com.robothaver.torrentfileparser.domain;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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public class Torrent {
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private String announce;
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private String name;
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private Long pieceLength;
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private boolean isSingleFile = true;
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private boolean isPrivate;
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private Long totalLength = 0L;
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private String pieces;
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private final List<TorrentFile> files = new ArrayList<>();
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// Optional fields
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private List<List<String>> announceList = null;
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private String creator = null;
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private Long creationDate = null;
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private String source = null;
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private String comment = null;
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private String encoding = null;
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private Map<String, Object> azureusProperties = null;
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public String getAnnounce() {
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return announce;
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}
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public void setAnnounce(String announce) {
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this.announce = announce;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public Long getPieceLength() {
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return pieceLength;
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}
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public void setPieceLength(Long pieceLength) {
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this.pieceLength = pieceLength;
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}
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public boolean isSingleFile() {
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return isSingleFile;
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}
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public void setSingleFile(boolean singleFile) {
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isSingleFile = singleFile;
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}
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public boolean isPrivate() {
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return isPrivate;
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}
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public void setPrivate(boolean aPrivate) {
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isPrivate = aPrivate;
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}
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public Long getTotalLength() {
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return totalLength;
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}
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public void setTotalLength(Long totalLength) {
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this.totalLength = totalLength;
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}
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public String getPieces() {
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return pieces;
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}
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public void setPieces(String pieces) {
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this.pieces = pieces;
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}
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public List<TorrentFile> getFiles() {
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return files;
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}
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public List<List<String>> getAnnounceList() {
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return announceList;
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}
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public void setAnnounceList(List<List<String>> announceList) {
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this.announceList = announceList;
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}
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public String getCreator() {
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return creator;
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}
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public void setCreator(String creator) {
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this.creator = creator;
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}
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public Long getCreationDate() {
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return creationDate;
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}
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public void setCreationDate(Long creationDate) {
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this.creationDate = creationDate;
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}
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public String getSource() {
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return source;
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}
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public void setSource(String source) {
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this.source = source;
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}
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public String getComment() {
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return comment;
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}
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public void setComment(String comment) {
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this.comment = comment;
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}
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public String getEncoding() {
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return encoding;
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}
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public void setEncoding(String encoding) {
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this.encoding = encoding;
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}
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public Map<String, Object> getAzureusProperties() {
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return azureusProperties;
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}
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public void setAzureusProperties(Map<String, Object> azureusProperties) {
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this.azureusProperties = azureusProperties;
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}
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@Override
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public String toString() {
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return "Torrent{" +
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"announce='" + announce + '\'' +
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", name='" + name + '\'' +
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", pieceLength=" + pieceLength +
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", isSingleFile=" + isSingleFile +
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", isPrivate=" + isPrivate +
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", totalLength=" + totalLength +
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", files=" + files +
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", announceList=" + announceList +
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", creator='" + creator + '\'' +
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", creationDate=" + creationDate +
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", source='" + source + '\'' +
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", comment='" + comment + '\'' +
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", encoding='" + encoding + '\'' +
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", azureusProperties=" + azureusProperties +
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'}';
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}
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}

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