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static final int TOOBIG = 0x6400000; // 100MB

  // ...

  // write the files to the disk, but only if file is not insanely big
  if (entry.getSize() > TOOBIG) {
    throw new IllegalStateException("File to be unzipped is huge.");
  }
  if (entry.getSize() == -1) {
    throw new IllegalStateException("File to be unzipped might be huge.");
  }
  FileOutputStream fos = new FileOutputStream(entry.getName());
  dest = new BufferedOutputStream(fos, BUFFER);
  while ((count = zis.read(data, 0, BUFFER)) != -1) {
    dest.write(data, 0, count);
  }