throws DecoderException, UnsupportedEncodingException {
if (text == null) {
return null;
}
if (!text.startsWith(PREFIX) || !text.endsWith(POSTFIX)) {
throw new DecoderException("RFC 1522 violation: malformed encoded content");
}
final int terminator = text.length() - 2;
int from = 2;
int to = text.indexOf(SEP, from);
if (to == terminator) {
throw new DecoderException("RFC 1522 violation: charset token not found");
}
final String charset = text.substring(from, to);
if (charset.equals("")) {
throw new DecoderException("RFC 1522 violation: charset not specified");
}
from = to + 1;
to = text.indexOf(SEP, from);
if (to == terminator) {
throw new DecoderException("RFC 1522 violation: encoding token not found");
}
final String encoding = text.substring(from, to);
if (!getEncoding().equalsIgnoreCase(encoding)) {
throw new DecoderException("This codec cannot decode " + encoding + " encoded content");
}
from = to + 1;
to = text.indexOf(SEP, from);
byte[] data = StringUtils.getBytesUsAscii(text.substring(from, to));
data = doDecoding(data);