77 lines
2.2 KiB
Java
77 lines
2.2 KiB
Java
/*
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* DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
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* Copyright (C) 2010 Mickael Guessant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package davmail.exchange;
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import java.io.FilterOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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/**
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* RFC 1939: 3 Basic Operations
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* [...]
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* If any line begins with the termination octet, the line is "byte-stuffed" by
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* pre-pending the termination octet to that line of the response.
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*/
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public class DoubleDotOutputStream extends FilterOutputStream {
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// remember last 2 bytes written
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final int[] buf = {0, 0};
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/**
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* @inheritDoc
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*/
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public DoubleDotOutputStream(OutputStream out) {
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super(out);
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}
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@Override
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public void write(int b) throws IOException {
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if (b == '.' && (buf[0] == '\r' || buf[0] == '\n' || buf[0] == 0)) {
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// line starts with '.', prepend it with an additional '.'
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out.write('.');
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}
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out.write(b);
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buf[1] = buf[0];
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buf[0] = b;
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}
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/**
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* RFC 1939: 3 Basic Operations
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* [...]
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* Hence a multi-line response is terminated with the five octets
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* "CRLF.CRLF"
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* <p/>
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* Do not close actual outputstream
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*
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* @throws IOException on error
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*/
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@Override
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public void close() throws IOException {
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if (buf[1] != '\r' || buf[0] != '\n') {
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out.write('\r');
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out.write('\n');
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}
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out.write('.');
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out.write('\r');
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out.write('\n');
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}
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}
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