lib 1005255 // apache commons compress

import org.apache.commons.compress.compressors.*;

static CompressorInputStream bunzip2stream(InputStream in) ctex {
  BufferedInputStream buf = in instanceof BufferedInputStream
    ? (BufferedInputStream) in
    : new BufferedInputStream(in);
  ret new CompressorStreamFactory().createCompressorInputStream(buf);
}

static CompressorInputStream bunzip2stream(File f) ctex {
  ret bunzip2stream(newFileInputStream(f));
}

Began life as a copy of #1005257