jodd-mail/src/main/java/jodd/mail/EmailUtil.java
public static String extractEncoding(final String contentType) {
		int ndx = contentType.indexOf(';');
		final String charset = ndx != -1 ? contentType.substring(ndx + 1) : StringPool.EMPTY;
		String encoding = null;

		ndx = charset.indexOf(ATTR_CHARSET);
		if (ndx != -1) {
			ndx += ATTR_CHARSET.length();
			final int len = charset.length();

			if (charset.charAt(ndx) == '"') {
				ndx++;
			}
			final int start = ndx;

			while (ndx < len) {
				final char c = charset.charAt(ndx);
				if ((c == '"') || (CharUtil.isWhitespace(c)) || (c == ';')) {
					break;
				}
				ndx++;
			}
			encoding = charset.substring(start, ndx);
		}
		return encoding;
	}
public static String extractEncoding(final String contentType) {
		int ndx = contentType.indexOf(';');
		final String charset = ndx != -1 ? contentType.substring(ndx + 1) : StringPool.EMPTY;
		String encoding = null;

		ndx = charset.indexOf(ATTR_CHARSET);
		if (ndx != -1) {
			ndx += ATTR_CHARSET.length();
			final int len = charset.length();

			if (charset.charAt(ndx) == '"') {
				ndx++;
			}
			final int start = ndx;

			while (ndx < len) {
				final char c = charset.charAt(ndx);
				if ((c == '"') || (CharUtil.isWhitespace(c)) || (c == ';')) {
					break;
				}
				ndx++;
			}
			encoding = charset.substring(start, ndx);
		}
		return encoding;
	}
TODO: should this always return lowercase or always uppercase?