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Minecraft mapping and rendering tool

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/* Copyright (c) 2012 Jesper Öqvist 
 *
 * This file is part of Chunky.
 *
 * Chunky 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 3 of the License, or
 * (at your option) any later version.
 *
 * Chunky 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 Chunky.  If not, see .
 */
package se.llbit.nbt.test;

import se.llbit.nbt.AnyTag;
import se.llbit.nbt.CompoundTag;
import se.llbit.nbt.NamedTag;
import se.llbit.nbt.StringTag;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

public class PlayerExtractor {

  public static void main(String[] args) throws IOException {
    if (args.length < 1) {
      System.out.println("arguments: ");
      System.exit(1);
    }

    String fn = args[0];
    String outFn = "player.dat";

    System.out.println("parsing " + fn);
    try (DataInputStream in = new DataInputStream(new GZIPInputStream(new FileInputStream(fn)))) {

      Set request = new HashSet<>();
      request.add(".Data.Player");
      Map result = NamedTag.quickParse(in, request);
      in.close();

      AnyTag playerTag = result.get(".Data.Player");

      System.out.println("writing output to " + outFn);
      try (DataOutputStream out =
          new DataOutputStream(new GZIPOutputStream(new FileOutputStream(outFn)))) {
        NamedTag rootTag = new NamedTag(new StringTag(""), (CompoundTag) playerTag);
        rootTag.write(out);
      }
      System.out.println("done");
    }
  }

}