Reads the value of the corresponding checksum file, if existing.
# S3 method for GenericDataFile
readChecksum(this, ...)Returns a character string, which can be NA if file is missing.
An exception is thrown if the file does not exist, and hence not
the checksum file.
Not used.
Henrik Bengtsson
The content of the checksum file is trimmed from comment lines, whitespaces and then validated that the remaining part contains a hexadecimal value.
*validateChecksum().
*compareChecksum().
*writeChecksum().
*getChecksum().
For more information see GenericDataFile.