private static int getLength(byte[] bytes, int offset) {
    return TAG_LENGTH_SIZE + Bytes.readAsInt(bytes, offset, TAG_LENGTH_SIZE);
  }
Creates a Tag from the specified byte array and offset. Presumes <code>bytes</code> content
starting at <code>offset</code> is formatted as a Tag blob. The bytes to include the tag type,
tag length and actual tag bytes.
@param offset offset to start of Tag
hbase-common/src/main/java/org/apache/hadoop/hbase/ArrayBackedTag.java