Method Detail

• read

  public static String read(File checksumFile)
                     throws IOException

  Extracts the checksum from the specified file.

  Parameters:

  checksumFile - The path to the checksum file, must not be null.

  Returns:

  The checksum stored in the file, never null.

  Throws:

  IOException - If the checksum does not exist or could not be read for other reasons.

• calc

  public static Map<String,Object> calc(File dataFile,
                        Collection<String> algos)
                                 throws IOException

  Calculates checksums for the specified file.

  Parameters:

  dataFile - The file for which to calculate checksums, must not be null.

  algos - The names of checksum algorithms (cf. MessageDigest.getInstance(String) to use, must not be null.

  Returns:

  The calculated checksums, indexed by algorithm name, or the exception that occurred while trying to calculate it, never null.

  Throws:

  IOException - If the data file could not be read.

• toHexString

  public static String toHexString(byte[] bytes)

  Creates a hexadecimal representation of the specified bytes. Each byte is converted into a two-digit hex number and appended to the result with no separator between consecutive bytes.

  Parameters:

  bytes - The bytes to represent in hex notation, may be be null.

  Returns:

  The hexadecimal representation of the input or null if the input was null.