/**
* Calculates hash with algorithm "MD5", "SHA-1" or SHA-256". Hash is calculated EXCLUDING
* meta-data, like id3v1 or id3v2
*
* @return byte[] hash value in byte
* @param String algorithm
* @param int buffersize
* @throws IOException
* @throws InvalidAudioFrameException
* @throws NoSuchAlgorithmException
*/
public byte[] getHash(String algorithm, int bufferSize)
throws InvalidAudioFrameException, IOException, NoSuchAlgorithmException {
File mp3File = getFile();
long startByte = getMP3StartByte(mp3File);
int id3v1TagSize = 0;
if (hasID3v1Tag()) {
ID3v1Tag id1tag = getID3v1Tag();
id3v1TagSize = id1tag.getSize();
}
InputStream inStream = Files.newInputStream(Paths.get(mp3File.getAbsolutePath()));
byte[] buffer = new byte[bufferSize];
MessageDigest digest = MessageDigest.getInstance(algorithm);
inStream.skip(startByte);
int read;
long totalSize = mp3File.length() - startByte - id3v1TagSize;
int pointer = buffer.length;
while (pointer <= totalSize) {
read = inStream.read(buffer);
digest.update(buffer, 0, read);
pointer += buffer.length;
}
read = inStream.read(buffer, 0, (int) totalSize - pointer + buffer.length);
digest.update(buffer, 0, read);
byte[] hash = digest.digest();
return hash;
}
/**
* Saves the tags in this dataType to the file argument. It will be saved as
* TagConstants.MP3_FILE_SAVE_WRITE
*
* @param fileToSave file to save the this dataTypes tags to
* @throws FileNotFoundException if unable to find file
* @throws IOException on any I/O error
*/
public void save(File fileToSave) throws IOException {
// Ensure we are dealing with absolute filepaths not relative ones
File file = fileToSave.getAbsoluteFile();
logger.config("Saving : " + file.getPath());
// Checks before starting write
precheck(file);
RandomAccessFile rfile = null;
try {
// ID3v2 Tag
if (TagOptionSingleton.getInstance().isId3v2Save()) {
if (id3v2tag == null) {
rfile = new RandomAccessFile(file, "rw");
(new ID3v24Tag()).delete(rfile);
(new ID3v23Tag()).delete(rfile);
(new ID3v22Tag()).delete(rfile);
logger.config("Deleting ID3v2 tag:" + file.getName());
rfile.close();
} else {
logger.config("Writing ID3v2 tag:" + file.getName());
final MP3AudioHeader mp3AudioHeader = (MP3AudioHeader) this.getAudioHeader();
final long mp3StartByte = mp3AudioHeader.getMp3StartByte();
final long newMp3StartByte = id3v2tag.write(file, mp3StartByte);
if (mp3StartByte != newMp3StartByte) {
logger.config("New mp3 start byte: " + newMp3StartByte);
mp3AudioHeader.setMp3StartByte(newMp3StartByte);
}
}
}
rfile = new RandomAccessFile(file, "rw");
// Lyrics 3 Tag
if (TagOptionSingleton.getInstance().isLyrics3Save()) {
if (lyrics3tag != null) {
lyrics3tag.write(rfile);
}
}
// ID3v1 tag
if (TagOptionSingleton.getInstance().isId3v1Save()) {
logger.config("Processing ID3v1");
if (id3v1tag == null) {
logger.config("Deleting ID3v1");
(new ID3v1Tag()).delete(rfile);
} else {
logger.config("Saving ID3v1");
id3v1tag.write(rfile);
}
}
} catch (FileNotFoundException ex) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE_FILE_NOT_FOUND.getMsg(file.getName()),
ex);
throw ex;
} catch (IOException iex) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE.getMsg(file.getName(), iex.getMessage()),
iex);
throw iex;
} catch (RuntimeException re) {
logger.log(
Level.SEVERE,
ErrorMessage.GENERAL_WRITE_FAILED_BECAUSE.getMsg(file.getName(), re.getMessage()),
re);
throw re;
} finally {
if (rfile != null) {
rfile.close();
}
}
}
