long offset = i * ZiplinedBlock.BLOCK_SIZE;
raf.seek(offset);
// BufferedReader br = new BufferedReader(new InputStreamReader(
// new GZIPInputStream(new FileInputStream(raf.getFD())),ByteOp.UTF8));
BufferedReader br = new BufferedReader(new InputStreamReader(
new OpenJDK7GZIPInputStream(new FileInputStream(raf.getFD())),ByteOp.UTF8));
String line = br.readLine();
if(line == null) {
System.err.println("Bad block at " + offset + " in " + args[0]);
System.exit(1);
}