protected byte[] doEncoding(byte[] bytes) {
if (bytes == null) {
return null;
}
byte[] data = QuotedPrintableCodec.encodeQuotedPrintable(PRINTABLE_CHARS, bytes);
if (this.encodeBlanks) {
for (int i = 0; i < data.length; i++) {
if (data[i] == 32) {
data[i] = 95;
}
}
}
return data;
}
