/**
* If the frame body's values have been modified, then resize the raw binary buffer and store the
* new values there. When finished, the dirty flag is reset to indicate that the buffer is up to
* date, and the frame is now ready to be saved to the .mp3 file.
*/
@Override
public void setBuffer() {
if (isDirty()) {
byte[] languageBytes = language.getCodeBytes();
byte[] textBytes = stringToBytes(encoding.getCharacterSet(), text);
int index = 0;
buffer = new byte[1 + languageBytes.length + textBytes.length];
buffer[index] = (byte) encoding.ordinal();
index = 1;
System.arraycopy(languageBytes, 0, buffer, index, languageBytes.length);
index += languageBytes.length;
System.arraycopy(textBytes, 0, buffer, index, textBytes.length);
dirty = false;
}
}
/**
* parses the raw bytes of the frame body and stores the parsed values in the frame's fields.
*
* @throws IllegalArgumentException if an invalid value is detected while parsing the frame body's
* raw bytes.
*/
@Override
public void parse() throws IllegalArgumentException {
try {
setEncoding(Encoding.getEncoding(buffer[0]));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to ISO-8859-1 so we can continue parsing the
// tag
setEncoding(Encoding.ISO_8859_1);
}
try {
setLanguage(
Language.getLanguage(new String(buffer, 1, 3, Encoding.ISO_8859_1.getCharacterSet())));
} catch (
IllegalArgumentException
ex) { // ignore the bad value and set it to english so we can continue parsing the tag
setLanguage(Language.ENG);
}
text = new String(buffer, 4, buffer.length - 4, encoding.getCharacterSet()).trim();
dirty =
false; // we just read in the frame info, so the frame body's internal byte buffer is up to
// date
}
