code: public static CompressionMetadata create(String dataFilePath)
      {
          Descriptor desc = Descriptor.fromFilename(dataFilePath);
          return new CompressionMetadata(desc.filenameFor(Component.COMPRESSION_INFO), new File(dataFilePath).length(), desc.version.hasPostCompressionAdlerChecksums);
      }
docs: Create metadata about given compressed file including uncompressed data length, chunk size
  and list of the chunk offsets of the compressed data.
  
  This is an expensive operation! Don't create more than one for each
  sstable.
  
  @param dataFilePath Path to the compressed file
  
  @return metadata about given compressed file.