static public long unpackLong(DataInput in) throws IOException {
        long ret = 0;
        byte v;
        do{
            v = in.readByte();
            ret = (ret<<7 ) | (v & 0x7F);
        }while((v&0x80)==0);

        return ret;
    }
static public long unpackLong ( DataInput in ) throws IOException { long ret = 0 ; byte v ; do { v = in . readByte ( ) ; ret = ( ret << 7 ) | ( v & 0x7F ) ; } while ( ( v & 0x80 ) == 0 ) ; return ret ; }
Unpack long value from the input stream.

@param in The input stream.
@return The long value.

@throws java.io.IOException in case of IO error