WebLoader.java :  » Game » skbot-client » org » rsbot » bot » Java Open Source

package org.rsbot.bot;

import org.rsbot.util.GlobalConfiguration;

import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.util.logging.Logger;
import java.util.zip.GZIPInputStream;

/**
 * @author Timer
 * @author Paris
 */
class WebLoader {
  private final Logger log = Logger.getLogger(WebLoader.class.getName());

  public boolean load() {
    try {
      File webFile = new File(GlobalConfiguration.Paths.getWebCache());
      download(webFile, new URL(GlobalConfiguration.Paths.URLs.WEB));
      return webFile.exists() && webFile.canRead() && webFile.canWrite();
    } catch (Exception ignored) {
    }
    return false;
  }

  private void download(File file, URL url) {
    try {
      URLConnection uc = url.openConnection();
      uc.setConnectTimeout(10000);
      DataInputStream di = new DataInputStream(uc.getInputStream());
      byte[] buffer = new byte[uc.getContentLength()];
      di.readFully(buffer);
      di.close();
      buffer = ungzip(buffer);
      if (buffer.length == 0) {
        log.warning("Could not retrieve web matrix");
      }
      if (!file.exists()) {
        file.createNewFile();
      }
      if (file.exists() && (!file.canRead() || file.canWrite())) {
        file.setReadable(true);
        file.setWritable(true);
      }
      if (file.exists() && file.canRead() && file.canWrite()) {
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(buffer);
        fos.flush();
        fos.close();
      }
    } catch (Exception ignored) {
    }
  }

  /*
   * Ungzips a binary buffer if it is gzipped.
   */
  private byte[] ungzip(byte[] data) {
    if (data.length < 2) {
      return data;
    }

    int header = (data[0] | data[1] << 8) ^ 0xffff0000;
    if (header != GZIPInputStream.GZIP_MAGIC) {
      return data;
    }

    try {
      ByteArrayInputStream b = new ByteArrayInputStream(data);
      GZIPInputStream gzin = new GZIPInputStream(b);
      ByteArrayOutputStream out = new ByteArrayOutputStream(data.length);
      for (int c = gzin.read(); c != -1; c = gzin.read()) {
        out.write(c);
      }
      return out.toByteArray();
    } catch (IOException e) {
      e.printStackTrace();
      return data;
    }
  }
}