private static byte[] readBlobContent(byte[] input) throws IOException {
    return readBlobContent(Fileformat.Blob.parseFrom(input));
  }
Converts PBF block data into decoded entities. This class was adapted from Osmosis to expose an iterator over blocks
to give more control over the parallelism.

@author Brett Henderson
planetiler-core/src/main/java/com/onthegomap/planetiler/reader/osm/PbfDecoder.java