MessageOutputStream.java
上传用户:huihesys
上传日期:2007-01-04
资源大小:3877k
文件大小:2k
- /*
- * MessageOutputStream.java
- * Copyright (C) 1999 dog <dog@dog.net.uk>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * You may retrieve the latest version of this library from
- * http://www.dog.net.uk/knife/
- */
- package dog.mail.util;
- import java.io.*;
- /**
- * An output stream that escapes any dots on a line by themself with
- * another dot, for the purposes of sending messages to SMTP and NNTP servers.
- *
- * @author dog@dog.net.uk
- * @version 1.0
- */
- public class MessageOutputStream extends FilterOutputStream {
- /**
- * The stream termination octet.
- */
- public static final int END = 46;
-
- /**
- * The line termination octet.
- */
- public static final int LF = 10;
- int last = -1; // the last character written to the stream
-
- /**
- * Constructs a message output stream connected to the specified output stream.
- * @param out the target output stream
- */
- public MessageOutputStream(OutputStream out) {
- super(out);
- }
- /**
- * Writes a character to the underlying stream.
- * @exception IOException if an I/O error occurred
- */
- public void write(int ch) throws IOException {
- if ((last==LF || last==-1) && ch==END)
- out.write(END); // double any lonesome dots
- super.write(ch);
- }
- /**
- * Writes a portion of a byte array to the underlying stream.
- * @exception IOException if an I/O error occurred
- */
- public void write(byte b[], int off, int len) throws IOException {
- int k = last != -1 ? last : LF;
- int l = off;
- len += off;
- for (int i = off; i < len; i++) {
- if (k==LF && b[i]==END) {
- super.write(b, l, i-l);
- out.write(END);
- l = i;
- }
- k = b[i];
- }
- if (len-l > 0)
- super.write(b, l, len-l);
- }
-
- }