code: @DoesServiceRequest
      public final int downloadRangeToByteArray(final long offset, final Long length, final byte[] buffer,
              final int bufferOffset) throws StorageException {
          return this.downloadRangeToByteArray(offset, length, buffer, bufferOffset, null /* accessCondition */,
                  null /* options */, null /* opContext */);
      }
docs: Downloads a range of bytes from the file to the given byte buffer.
  
  @param offset
  A <code>long</code> which represents the byte offset to use as the starting point for the source.
  @param length
  A <code>Long</code> which represents the number of bytes to read or null.
  @param buffer
  A <code>byte</code> array which represents the buffer to which the file bytes are downloaded.
  @param bufferOffset
  An <code>int</code> which represents the byte offset to use as the starting point for the target.
  
  @throws StorageException